Patent Publication Number: US-2022213900-A1

Title: Supercharger and method for connecting pipe in supercharger

Description:
TECHNICAL FIELD 
     The present invention relates to a supercharger that increases the pressure of air taken in by an internal combustion engine, and a method for connecting a pipe in the supercharger. 
     BACKGROUND ART 
     For example, an exhaust turbine supercharger has a compressor, a turbine, and a housing. A rotary shaft is rotatably supported in the housing, a compressor wheel is connected to one end portion in an axial direction, and a turbine wheel is connected to the other end portion. Then, an exhaust gas is supplied into the housing, and the turbine wheel rotates, so that the rotary shaft rotates to rotate the compressor wheel. The compressor wheel pressurizes air taken in from the outside to produce compressed air, and supplies this compressed air to an internal combustion engine. 
     In such an exhaust turbine supercharger, the rotary shaft is rotatably supported by a bearing in the housing, and a lubricant is supplied to the bearing. Therefore, the housing is provided with a lubricant supply flow path for supplying the lubricant from the outside to the bearing, and is provided with a lubricant discharge flow path for discharging the lubricant supplied to the bearing to the outside. Then, a lubricant supply pipe is connected to the lubricant supply flow path, and a lubricant discharge pipe is connected to the lubricant discharge flow path. Further, in the turbine, an exhaust gas is supplied to the inside thereof, so that the housing becomes hot, and thus there is a concern that the lubricant may deteriorate. Therefore, a cooling water flow path for circulating cooling water is provided in the housing. Then, a cooling water supply pipe is connected to an inlet hole for the cooling water flow path, and a cooling water discharge pipe is connected to an outlet hole. Such a supercharger, for example, is described in PTL 1 below. 
     CITATION LIST 
     Patent Literature 
     
         
         [PTL 1] Japanese Unexamined Patent Application Publication No. 9-310620 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     The pipe for the lubricant or the pipe for the cooling water is provided with a flange at an end portion, and the pipe is connected to the housing by fixing the flange to the housing. The supercharger described above has four pipes for the lubricant or the cooling water. In recent years, there has been a demand for integrating and connecting a plurality of pipes at one location as much as possible in order to save space around the internal combustion engine. In this case, it is necessary to secure a mounting surface for fixing flanges of a plurality of pipes on the outer surface of the housing, and thus there is a problem such as an increase in cost due to an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     The present invention is for solving the problem described above, and has an object to provide a supercharger and a method for connecting a pipe in the supercharger, in which it is possible to integrate and connect a plurality of pipes to a housing and to suppress an increase in cost. 
     Solution to Problem 
     In order to achieve the object described above, according to an aspect of the present invention, there is provided a supercharger including: a housing; a rotary shaft that is rotatably supported inside the housing; a compressor wheel that is provided at one end portion in an axial direction of the rotary shaft; a first pipe that has a first mounting flange at an end portion thereof and that is connected to the housing; and a second pipe that has a second mounting flange at an end portion thereof and that is connected to the housing, in which the end portion of the first pipe is inserted into a first mounting hole that is provided in the housing, and the end portion of the second pipe is inserted into a second mounting hole that is provided in the housing, and the second mounting flange presses the first mounting flange in an insertion direction and is fixed to the housing. 
     Therefore, the end portion of the first pipe is inserted into the first mounting hole of the housing, and the end portion of the second pipe is inserted into the second mounting hole of the housing. Therefore, the first pipe and the second pipe are connected to the housing. At this time, the second mounting flange presses the first mounting flange in the insertion direction and is fixed to the housing. That is, the second pipe is fixed to the housing through the second mounting flange, and the first pipe is fixed to the housing through the second mounting flange of the second pipe that is fixed to the housing. Therefore, a plurality of pipes can be integrated and connected to the housing, and an increase in cost can be suppressed by suppressing an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     In the supercharger according to the present invention, the rotary shaft is rotatably supported by the housing through a bearing, and at least one of the first mounting hole and the second mounting hole is a lubricant supply hole or a lubricant discharge hole communicating with the bearing. 
     Therefore, the pipes for supplying or discharging a lubricant with respect to the bearing that rotatably supports the rotary shaft can be integrated and connected to the housing. 
     In the supercharger according to the present invention, the housing has a refrigerant flow path provided around the rotary shaft, and at least one of the first mounting hole and the second mounting hole is a refrigerant supply hole or a refrigerant discharge hole communicating with the refrigerant flow path. 
     Therefore, the pipes for supplying or discharging a refrigerant with respect to the refrigerant flow path that cools the housing can be integrated and connected to the housing. 
     In the supercharger according to the present invention, the rotary shaft is rotatably supported by the housing through a bearing, one of the first mounting hole and the second mounting hole is a lubricant supply hole or a lubricant discharge hole communicating with the bearing, the housing has a refrigerant flow path provided around the rotary shaft, and the other of the first mounting hole and the second mounting hole is a refrigerant supply hole or a refrigerant discharge hole communicating with the refrigerant flow path. 
     Therefore, the pipe for supplying or discharging the lubricant with respect to the bearing that rotatably supports the rotary shaft and the pipe for supplying or discharging the refrigerant with respect to the refrigerant flow path that cools the housing can be integrated and connected to the housing. 
     In the supercharger according to the present invention, the first mounting flange and the second mounting flange overlap in a thickness direction of the first mounting flange and the second mounting flange, and only the second mounting flange is fixed to the housing. 
     Therefore, by fixing only the second mounting flange to the housing, it is possible to connect the second pipe to the housing, and the second mounting flange presses the first mounting flange, so that the first pipe can be connected to the housing. Therefore, connection portions of a plurality of pipes with respect to the housing can be simplified. 
     In the supercharger according to the present invention, a rotation prevention mechanism for preventing rotation of the first pipe with respect to the housing is provided. 
     Therefore, the first pipe is prevented from becoming detached by the second mounting flange of the second pipe, and the rotation thereof is prevented by the rotation prevention mechanism. Therefore, the first pipe can be firmly connected to the housing. 
     In the supercharger according to the present invention, as the rotation prevention mechanism, a contact portion that comes into contact with the second pipe to prevent rotation of the first pipe is provided in the first mounting flange. 
     Therefore, as the rotation prevention mechanism, the contact portion is provided in the first mounting flange, so that the contact portion of the first mounting flange comes into contact with the second pipe to prevent the rotation of the first pipe, and thus the rotation of the first pipe can be easily prevented without changing the structure of the first pipe. 
     In the supercharger according to the present invention, as the rotation prevention mechanism, a contact portion that comes into contact with the second mounting flange to prevent rotation of the first pipe is provided in the first pipe. 
     Therefore, as the rotation prevention mechanism, the contact portion is provided in the first pipe, so that the contact portion of the first pipe comes into contact with the second mounting flange to prevent the rotation of the first pipe, and thus the rotation of the first pipe can be easily prevented without changing the structure of the first mounting flange. 
     In the supercharger according to the present invention, as the rotation prevention mechanism, a contact portion that comes into contact with the housing to prevent rotation of the first pipe is provided in the first mounting flange. 
     Therefore, as the rotation prevention mechanism, the contact portion is provided in the first mounting flange, so that the contact portion of the first mounting flange comes into contact with the housing to prevent the rotation of the first pipe, and thus the rotation of the first pipe can be easily prevented without changing the structure of the first pipe. 
     In the supercharger according to the present invention, the first mounting flange and the second mounting flange overlap in a thickness direction of the first mounting flange and the second mounting flange, and both the first mounting flange and the second mounting flange are fixed to the housing. 
     Therefore, the first mounting flange and the second mounting flange overlap and fixed to the housing, so that two pipes can be fixed through the two mounting flanges by one fixing member, and thus connection portions of a plurality of pipes can be simplified. 
     In the supercharger according to the present invention, the first pipe and the second pipe are parallel to each other and are fixed to the housing. 
     Therefore, the first pipe and the second pipe are parallel to each other, so that the first mounting hole and the second mounting hole are parallel to each other, and therefore, the processing of the two mounting holes with respect to the housing is simplified, so that the workability can be improved and the ease-of-assembly of the two pipes with respect to the two mounting holes can be improved. 
     In the supercharger according to the present invention, a first mounting surface of the housing, in which the first mounting hole is formed, and a second mounting surface of the housing, in which the second mounting hole is formed, are continuous flat surfaces. 
     Therefore, by forming the two mounting holes on the mounting surface which is one flat surface, the processing on the mounting surfaces can be easily performed, so that the workability can be improved. 
     In the supercharger according to the present invention, a first mounting surface of the housing, in which the first mounting hole is formed, and a second mounting surface of the housing, in which the second mounting hole is formed, are flat surfaces having a step therebetween, the first mounting flange comes into contact with the first mounting surface, and the second mounting flange comes into contact with the second mounting surface. 
     Therefore, even if there is the step between the first mounting surface and the second mounting surface, the first mounting flange is brought into contact with the first mounting surface, and the second mounting flange is brought into contact with the second mounting surface. Therefore, two pipes can be connected to the housing, and a plurality of pipes can be integrated and connected to the housing regardless of the shape of the housing. 
     In the supercharger according to the present invention, a plurality of the first pipes are provided, and a common first mounting flange is provided at end portions of the plurality of first pipes. 
     Therefore, the common first mounting flange is provided at the end portions of the plurality of first pipes, so that the plurality of first pipes can be connected to the housing merely by fixing the second mounting flange to the housing, and therefore, the structure can be simplified and the workability can be improved. 
     In the supercharger according to the present invention, a plurality of the second pipes are provided, and a common second mounting flange is provided at end portions of the plurality of second pipes. 
     Therefore, the common second mounting flange is provided at the end portions of the plurality of second pipes, so that the plurality of second pipes can be connected to the housing merely by fixing one second mounting flange to the housing, and therefore, the structure can be simplified and the workability can be improved. 
     In the supercharger according to the present invention, a third pipe that has a third mounting flange at an end portion thereof and that is connected to the housing is provided, the first mounting flange and the second mounting flange overlap in a thickness direction of the first mounting flange and the second mounting flange, the second mounting flange and the third mounting flange overlap in a thickness direction of the second mounting flange and the third mounting flange, the second mounting flange is fixed to the housing and presses the first mounting flange and the third mounting flange in an insertion direction, and a rotation prevention mechanism for preventing rotation of the first pipe and the third pipe with respect to the housing is provided. 
     Therefore, three or more pipes can be integrated and connected to the housing, and an increase in cost can be suppressed by suppressing an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     In the supercharger according to the present invention, a turbine wheel is provided at the other end portion in the axial direction of the rotary shaft. 
     Therefore, in an exhaust turbine supercharger, a plurality of pipes can be integrated and connected to the housing, and an increase in cost can be suppressed by suppressing an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     In the supercharger according to the present invention, a motor that drives the rotary shaft is provided in the housing. 
     Therefore, in an electric supercharger, a plurality of pipes can be integrated and connected to the housing, and an increase in cost can be suppressed by suppressing an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     According to another aspect of the present invention, there is provided a method for connecting a pipe in a supercharger which includes a housing, a rotary shaft that is rotatably supported inside the housing, a compressor wheel that is provided at one end portion in an axial direction of the rotary shaft, a first pipe that has a first mounting flange at an end portion thereof and that is connected to the housing, and a second pipe that has a second mounting flange at an end portion thereof and that is connected to the housing, the method including: a step of inserting the end portion of the first pipe into a first mounting hole that is provided in the housing; a step of inserting the end portion of the second pipe into a second mounting hole that is provided in the housing; and a step of pressing the first mounting flange in an insertion direction of the second pipe via the second mounting flange to fix the first mounting flange to the housing. 
     Therefore, a plurality of pipes can be integrated and connected to the housing, and an increase in cost can be suppressed by suppressing an increase in the size of the housing, the occurrence of processing work on the mounting surface, or the like. 
     Advantageous Effects of Invention 
     According to the supercharger and the method for connecting a pipe in the supercharger according to the present invention, it is possible to integrate and connect a plurality of pipes to the housing and to suppress an increase in cost. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a sectional view showing an exhaust turbine supercharger of a first embodiment. 
         FIG. 2  is a sectional view showing a lubrication system of the exhaust turbine supercharger. 
         FIG. 3  is a sectional view showing a cooling system of the exhaust turbine supercharger. 
         FIG. 4  is a perspective view showing a connection portion of a pipe with respect to a housing. 
         FIG. 5  is a sectional view showing the connection portion of the pipe with respect to the housing. 
         FIG. 6  is a perspective view of the connection portion of the pipe in the first embodiment as viewed from above. 
         FIG. 7  is a perspective view of the connection portion of the pipe as viewed from below. 
         FIG. 8  is a perspective view showing a connection portion of a pipe with respect to a housing in an exhaust turbine supercharger of a second embodiment. 
         FIG. 9  is a perspective view showing a connection portion of a pipe in a first modification example of the second embodiment. 
         FIG. 10  is a perspective view showing a connection portion of a pipe in a second modification example of the second embodiment. 
         FIG. 11  is a perspective view showing a connection portion of a pipe in an exhaust turbine supercharger of a third embodiment. 
         FIG. 12  is a perspective view showing a connection portion of a pipe with respect to a housing. 
         FIG. 13  is a perspective view showing a connection portion of a pipe in an exhaust turbine supercharger of a fourth embodiment. 
         FIG. 14  is a perspective view showing a connection portion of a pipe with respect to a housing. 
         FIG. 15  is a sectional view showing a connection portion of a pipe. 
         FIG. 16  is a sectional view showing an electric supercharger of a fifth embodiment. 
         FIG. 17  is a sectional view showing a connection portion of a pipe with respect to a housing. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, preferred embodiments of a supercharger and a method for connecting pipes in the supercharger according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to these embodiments, and in a case where there is a plurality of embodiments, the present invention also includes configurations made by combining the respective embodiments. 
     First Embodiment 
       FIG. 1  is a sectional view showing an exhaust turbine supercharger of a first embodiment,  FIG. 2  is a sectional view showing a lubrication system of the exhaust turbine supercharger, and  FIG. 3  is a sectional view showing a cooling system of the exhaust turbine supercharger. 
     As shown in  FIG. 1 , an exhaust turbine supercharger  10  as the supercharger according to the present invention includes a housing  11 , a turbine  12 , a compressor  13 , and a rotary shaft  14 . 
     The housing  11  is formed so as to have a hollow inside and is composed of a turbine housing  21  forming a first space portion S 1  that accommodates the configuration of the turbine  12 , a compressor housing  22  forming a second space portion S 2  that accommodates the configuration of the compressor  13 , and a bearing housing  23  forming a third space portion S 3  that accommodates the rotary shaft  14 . The third space portion S 3  of the bearing housing  23  is located between the first space portion S 1  of the turbine housing  21  and the second space portion S 2  of the compressor housing  22 . 
     The rotary shaft  14  is disposed in the bearing housing  23 , the end portion on the turbine  12  side is rotatably supported on the bearing housing  23  by a journal bearing  24 , and the end portion on the compressor  13  side is rotatably supported on the bearing housing  23  by a journal bearing  25  and a thrust bearing  26 . A turbine wheel  31  of the turbine  12  is fixed to one end portion in an axial direction of the rotary shaft  14 . The turbine wheel  31  is accommodated in the first space portion S 1  of the turbine housing  21 , and a plurality of turbine blades forming an axial flow type are provided at the outer peripheral portion at predetermined intervals in a circumferential direction. A compressor wheel  33  of the compressor  13  is fixed to the other end portion in the axial direction of the rotary shaft  14 . The compressor wheel  33  is accommodated in the first space portion S 1  of the compressor housing  22 , and a plurality of blades  34  are provided at the outer peripheral portion at predetermined intervals in the circumferential direction. 
     The turbine housing  21  is provided with an inlet flow path  35  for the exhaust gas and an outlet flow path for the exhaust gas with respect to the plurality of turbine blades  32 . The inlet flow path  35  is provided along the circumferential direction of the rotary shaft  14 , and the outlet flow path  36  is provided along the axial direction of the rotary shaft  14 . The turbine housing  21  is provided with a turbine nozzle  37  between the inlet flow path  35  and the turbine blade  32 . Therefore, the exhaust gas introduced from the inlet flow path  35  is statically expanded by the turbine nozzle  37  and then led to the plurality of turbine blades  32 , so that the turbine wheel  31  can be driven and rotated. 
     The compressor housing  22  is provided with an air intake port  38  and a compressed air discharge port  39  with respect to the compressor wheel  33 . The air intake port is provided along the axial direction of the rotary shaft  14 , and the compressed air discharge port  39  is provided along the circumferential direction of the rotary shaft  14 . The compressor housing  22  is provided with a diffuser  40  between the compressor wheel  33  and the compressed air discharge port  39 . Therefore, air as a combustion gas taken in from the air intake port  38  is compressed by the plurality of blades  34  of the compressor wheel  33  that is driven and rotated, and is discharged as compressed air from the compressed air discharge port  39  through the diffuser  40 . 
     In the exhaust turbine supercharger  10  configured in this manner, the turbine  12  is driven by the exhaust gas discharged from an exhaust system of an internal combustion engine (not shown), the rotation of the turbine is transmitted to the rotary shaft  14  to drive the compressor  13 , and the compressor  13  compresses the air and supplies it to an intake system of the internal combustion engine. 
     The exhaust turbine supercharger  10  is provided with an oil supply device  41  that supplies a lubricant to two journal bearings  24  and  25  and one thrust bearing  26 . As shown in  FIGS. 1 and 2 , the oil supply device  41  has a lubricant supply flow path  42  and a lubricant discharge flow path  43  formed in the bearing housing  23 . The lubricant supply flow path  42  is composed of a plurality of supply flow paths  51 ,  52 ,  53 ,  54 , and  55 . The lubricant discharge flow path  43  is composed of a plurality of discharge flow paths  56  and  57 . 
     The first supply flow path (lubricant supply hole) is provided along a radial direction in an upper portion of the bearing housing  23 . The second supply flow path  52  is provided along the axial direction in the upper portion of the bearing housing  23 , and a base end portion thereof communicates with the first supply flow path  51 . The third supply flow path  53  has a base end portion that communicates with the first supply flow path  51 , and is provided so as to face the journal bearing  24 . The fourth supply flow path  54  has a base end portion that communicates with the first supply flow path  51 , and is provided so as to face the journal bearing  25 . The fifth supply flow path  55  has a base end portion that communicates with the second supply flow path  52 , and is provided so as to face the thrust bearing  26 . The first discharge flow path  56  is provided as a space around the rotary shaft  14  between the journal bearing  24  and the journal bearing  25 . The second discharge flow path (lubricant discharge hole)  57  is provided along the radial direction in a lower portion of the bearing housing  23 . 
     A lubricant supply pipe  61  has one end portion that is connected to an oil pan (not shown), and the other end portion that is connected to the first supply flow path  51 . A lubricant discharge pipe  62  has one end portion that is connected to the second discharge flow path  57 , and the other end portion that is connected to the oil pan. The lubricant supply pipe  61  is provided with an oil pump and an oil filter (not shown) in the middle portion thereof. 
     Therefore, the lubricant supplied from the lubricant supply pipe  61  to the first supply flow path  51  is led to the second supply flow path  52 , the third supply flow path  53 , the fourth supply flow path  54 , and the fifth supply flow path  55 . The lubricant led to the third supply flow path  53  is supplied to the outer peripheral surface of the journal bearing  24 , and the lubricant led to the fourth supply flow path  54  is supplied to the outer peripheral surface of the journal bearing  25 . The lubricants led to the outer peripheral surfaces of the journal bearings  24  and  25  are supplied between the inner peripheral surfaces of the journal bearings  24  and  25  and the outer peripheral surface of the rotary shaft  14  through a large number of through-holes. Further, the lubricant led from the second supply flow path  52  to the fifth supply flow path  55  is supplied between the inner peripheral surface of the thrust bearing  26  and the outer peripheral surface of the rotary shaft  14 . Then, the lubricants supplied to the journal bearings  24  and  25  are discharged to the first discharge flow path  56  and fall into the third space portion S 3 . Further, the lubricant supplied to the thrust bearing  26  falls into the third space portion S 3 . The lubricants that have fallen into the third space portion S 3  are discharged from the second discharge flow path  57  to the lubricant discharge pipe  62 . 
     Further, as shown in  FIGS. 1 and 3 , the exhaust turbine supercharger  10  is provided with a cooling device that circulates cooling water (a refrigerant) inside the bearing housing  23 . The cooling device  71  has a cooling water annular flow path (refrigerant flow path)  72 , a cooling water supply flow path (refrigerant supply hole)  73 , and a cooling water discharge flow path (refrigerant discharge hole)  74  formed in the bearing housing  23 . 
     The cooling water annular flow path  72  is provided on the turbine  12  side of the bearing housing  23 . That is, the cooling water annular flow path  72  is provided extending along the circumferential direction on the outer side in the radial direction of the journal bearing  24  in the bearing housing  23 . The cooling water annular flow path  72  is a flow path along the circumferential direction. However, it is interrupted by providing an end portion at the upper portion of the bearing housing  23 . Each of the cooling water supply flow path  73  and the cooling water discharge flow path  74  is provided along the radial direction in the upper portion of the bearing housing  23 . The cooling water supply flow path  73  and the cooling water discharge flow path  74  are provided so as to be linearly aligned with the first supply flow path  51  of the lubricant supply flow path  42  in the oil supply device  41  in the circumferential direction of the bearing housing  23 . 
     As shown in  FIGS. 1 to 3 , the bearing housing  23  has a mounting surface  101  formed on the outer peripheral surface of the upper portion thereof. The cooling water supply flow path  73 , the first supply flow path  51 , and the cooling water discharge flow path  74  are provided to be open in a direction orthogonal to the mounting surface  101 . The cooling water supply flow path  73 , the first supply flow path  51 , and the cooling water discharge flow path  74  are provided side by side in order along a horizontal direction intersecting the axial direction of the rotary shaft  14 . In this case, the first supply flow path  51  is provided along the radial direction (radial direction from the center) of the rotary shaft  14 . However, the cooling water supply flow path  73  and the cooling water discharge flow path  74  are provided along a direction parallel to the first supply flow path  51 , not along the radial direction of the rotary shaft  14 . The arrangement order of the flow paths  51 ,  73 , and  74  is not limited to the present embodiment. 
     A tip portion of the cooling water supply flow path  73  communicates with one end portion of the cooling water annular flow path  72  through a connection flow path  75 . The cooling water discharge flow path  74  communicates with the other end portion of the cooling water annular flow path  72  through a connection flow path  76 . 
     A cooling water supply pipe  81  has one end portion that is connected to a discharge side of a cooling water pump (not shown), and the other end portion that is connected to the cooling water supply flow path  73 . A lubricant discharge pipe  82  has one end portion that is connected to the cooling water discharge flow path  74 , and the other end portion that is connected to a suction side of the cooling water pump. 
     The cooling water supplied from the cooling water supply pipe  81  to the cooling water supply flow path  73  flows to the cooling water annular flow path  72  through the connection flow path  75 . The cooling water flows along the cooling water annular flow path  72  to cool the bearing housing  23  and to indirectly suppress a temperature rise of the lubricant. The cooling water that has flowed through the cooling water annular flow path  72  flows into the cooling water discharge flow path  74  through the connection flow path  76 , and is discharged to the lubricant discharge pipe  82 . 
     Here, in the exhaust turbine supercharger  10  of the first embodiment, the connection portions of the lubricant supply pipe  61 , the cooling water supply pipe  81 , and the lubricant discharge pipe  82  with respect to the bearing housing  23  will be described in detail.  FIG. 4  is a perspective view showing a connection portion of a pipe with respect to a housing,  FIG. 5  is a sectional view showing the connection portion of the pipe with respect to the housing,  FIG. 6  is a perspective view of the connection portion of the pipe in the first embodiment as viewed from above, and  FIG. 7  is a perspective view of the connection portion of the pipe as viewed from below.  FIGS. 4 and 5  show the pipes  61 ,  81 , and  82  cut in the middle. 
     As shown in  FIGS. 4 to 7 , in the bearing housing  23 , the turbine  12  is located on one side in the axial direction of the rotary shaft  14  (refer to  FIG. 1 ), and the compressor  13  is located on the other side. The bearing housing  23  has the mounting surface  101  formed on the upper portion of the outer peripheral surface, and the mounting surface  101  is a flat surface having no step in the radial direction of the bearing housing  23 . The first supply flow path  51  configuring the lubricant supply flow path  42 , the cooling water supply flow path  73 , and the cooling water discharge flow path  74  are formed so as to be open on the mounting surface  101 . At this time, the first supply flow path  51 , the cooling water supply flow path  73 , and the cooling water discharge flow path  74  are orthogonal to the mounting surface  101  and are parallel to each other. Further, the cooling water supply flow path  73 , the first supply flow path  51 , and the cooling water discharge flow path  74  are provided side by side in order along the horizontal direction intersecting the axial direction of the rotary shaft  14 . That is, the first supply flow path  51  is located in the center of the bearing housing  23 , and the cooling water supply flow path and the cooling water discharge flow path  74  are located on both sides in the circumferential direction. 
     Then, an end portion  61   a  of the lubricant supply pipe  61  is connected to the first supply flow path  51 , an end portion  81   a  of the cooling water supply pipe  81  is connected to the cooling water supply flow path  73 , and an end portion  92   a  of the cooling water discharge pipe  82  is connected to the cooling water discharge flow path  74 . Here, the cooling water supply pipe  81  and the cooling water discharge pipe  82  correspond to a first pipe in the present invention, and the lubricant supply pipe  61  corresponds to a second pipe in the present invention. Further, the cooling water supply pipe  81  corresponds to a third pipe in the present invention. 
     In the first embodiment, in the cooling water discharge pipe (first pipe)  82 , a flange part  111  as a first mounting flange is fixed to the end portion  82   a  that is connected to the bearing housing  23 . The flange part  111  is fixed at a position separated from the tip of the cooling water discharge pipe  82  by an insertion length. In the lubricant supply pipe (second pipe)  61 , a flange part  112  as a second mounting flange is fixed to the end portion  61   a  that is connected to the bearing housing  23 . The flange part  112  is fixed at a position separated from the tip of the cooling water discharge pipe  82  by a length obtained by adding the thickness of the flange part  111  to the insertion length. In the cooling water supply pipe (first pipe, third pipe)  81 , a flange part  113  as a first mounting flange and a third mounting flange is fixed to the end portion  81   a  that is connected to the bearing housing  23 . The flange part  113  is fixed at a position separated from the tip of the cooling water supply pipe  81  by the insertion length. 
     The flange part  111  has an oval shape, and the cooling water discharge pipe  82  is penetrated and fixed to a through-hole  111   a  formed on one end portion side, and a contact portion  111   b  as a rotation prevention mechanism is formed on the other end portion side. The contact portion  111   b  is for preventing the rotation of the cooling water discharge pipe  82  with respect to the bearing housing  23 , and is a recessed portion having a curved shape following the outer peripheral surface of the lubricant supply pipe  61 . The flange part  112  has an oval shape, and the lubricant supply pipe  61  is penetrated and fixed to a through-hole  112   a  formed on one end portion side, and a mounting hole  112   b  is formed on the other end portion side. The flange part  113  has an oval shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  113   a  formed on one end portion side, and a contact portion  113   b  as a rotation prevention mechanism is formed on the other end portion side. The contact portion  113   b  is for preventing the rotation of the cooling water supply pipe  81  with respect to the bearing housing  23 , and is a recessed portion having a curved shape following the outer peripheral surface of the lubricant supply pipe  61 . 
     The end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  that is provided in the bearing housing  23 . At this time, a seal member  102  having a ring shape is interposed between the outer peripheral surface of the cooling water discharge pipe  82  and the inner peripheral surface of the cooling water discharge flow path  74 , and the lower surface of the flange part  111  adheres to the mounting surface  101  of the bearing housing  23  without any gap. Further, the end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  that is provided in the bearing housing  23 . At this time, a seal member  103  having a ring shape is interposed between the outer peripheral surface of the cooling water supply pipe  81  and the inner peripheral surface of the cooling water supply flow path  73 , and the lower surface of the flange part  113  adheres to the mounting surface  101  of the bearing housing  23  without any gap. Further, the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  that is provided in the bearing housing  23 . At this time, a seal member  104  having a ring shape is interposed between the outer peripheral surface of the lubricant supply pipe  61  and the inner peripheral surface of the first supply flow path  51 , and in the flange part  112 , the lower surface on one end portion side adheres to the upper surface of the flange part  113  of the cooling water supply pipe  81  without any gap, and the lower surface on the other end portion side adheres to the upper surface of the cooling water discharge pipe  82  without any gap. 
     Further, in the bearing housing  23 , a screw hole  105  is formed in a fixing surface  101   a  that rises adjacent to the mounting surface  101 . Further, in the flange part  111 , the position thereof in the circumferential direction is adjusted such that the contact portion  111   b  comes into contact with the outer peripheral surface of the lubricant supply pipe  61 , and in the flange part  113 , the position thereof in the circumferential direction is adjusted such that the contact portion  113   b  comes into contact with the outer peripheral surface of the lubricant supply pipe  61 . At this time, the lower surface of the flange part  112  adheres to the upper surfaces of the flange parts  111  and  113  of the cooling water supply pipe  81  and the cooling water discharge pipe  82  without any gap. Then, a fastening bolt  114  penetrates the mounting hole  112   b  of the flange part  112  and is screwed into the screw hole  105 . 
     Therefore, the lubricant supply pipe  61  is connected to the bearing housing  23  by fixing the flange part  112  to the fixing surface  101   a  via the fastening bolt  114 . In the cooling water supply pipe  81  and the cooling water discharge pipe  82 , the flange parts  111  and  113  overlap below the flange part  112  of the lubricant supply pipe  61  and are pressed in the insertion direction of each of the pipes  81  and  82 . Further, in the cooling water supply pipe  81  and the cooling water discharge pipe  82 , the contact portions  111   b  and  113   b  of the flange parts  111  and  113  come into contact with the outer peripheral surface of the lubricant supply pipe  61  to prevent the rotation of the cooling water supply pipe  81  and the cooling water discharge pipe  82 . Therefore, the cooling water supply pipe  81  and the cooling water discharge pipe  82  are connected to the bearing housing  23  by fixing the flange parts  111  and  113  via the flange part  112  of the lubricant supply pipe  61 . 
     In this manner, the supercharger of the first embodiment includes the housing  11  (the bearing housing  23 ), the rotary shaft  14  that is rotatably supported inside the housing  11 , the compressor wheel  33  (the compressor  13 ) that is provided at one end portion in the axial direction of the rotary shaft  14 , the cooling water supply pipe  81  and the cooling water discharge pipe  82  that have the flange parts  111  and  112  at the end portions  81   a  and  83   a  and that are connected to the housing  11 , and the lubricant supply pipe  61  that has the flange part  112  at the end portion  61   a  and that is connected to the housing  11 , the end portions  81   a  and  82   a  of the cooling water supply pipe  81  and the cooling water discharge pipe  82  are inserted into the cooling water supply flow path  73  and the cooling water discharge flow path  74  of the housing  11 , the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  of the housing  11 , and the flange part  112  presses the flange parts  111  and  113  in the insertion direction and is fixed to the housing  11 . 
     Therefore, the lubricant supply pipe  61  is fixed to the housing  11  through the flange part  112 , the flange part  113  is pressed by the flange part  112  of the lubricant supply pipe  61  fixed to the housing  11 , so that the cooling water supply pipe  81  is fixed, and the flange part  111  is pressed by the flange part  112  of the lubricant supply pipe  61  fixed to the housing  11 , so that the cooling water discharge pipe  82  is fixed. Therefore, it is possible to eliminate the need for fastening bolts or the like for fixing the flange parts  111  and  113  of the cooling water supply pipe  81  and the cooling water discharge pipe  82  to the housing  11 . As a result, the plurality of pipes  61 ,  81 , and  82  can be integrated and connected to the housing  11 , and an increase in cost can be suppressed by suppressing an increase in the size of the housing  11 , the occurrence of processing work on the mounting surface  101 , or the like. 
     In the supercharger of the first embodiment, the rotary shaft  14  is rotatably supported by the housing  11  through the bearings  24 ,  25 , and  26 , the lubricant supply flow path  42  and the lubricant discharge flow path  43  communicating with the bearings  24 ,  25 , and  26  are provided, the housing  11  is provided with the cooling water circulation flow path  72  around the rotary shaft  14 , the cooling water supply flow path  73  and the cooling water discharge flow path  74  communicating with the cooling water circulation flow path  72  are provided, and the lubricant supply pipe  61  that is connected to the first supply flow path  51  of the lubricant supply flow path  42 , and the cooling water supply pipe  81  and the cooling water discharge pipe  82  that are connected to the cooling water supply flow path  73  and the cooling water discharge flow path  74  are integrated at one location of the housing  11 . Therefore, it is possible to suppress an increase in cost by suppressing an increase in the size of the housing  11 , the occurrence of processing work on the mounting surface  101 , or the like. 
     In the supercharger of the first embodiment, the flange part  112  of the lubricant supply pipe  61  and the flange parts  111  and  113  of the cooling water supply pipe  81  and the cooling water discharge pipe  82  overlap in the thickness direction thereof, and only the flange part  112  on the upper side is fixed to the housing  11 . Therefore, only the flange part  112  is fixed to the housing  11 , so that the lubricant supply pipe  61  can be connected to the housing  11 , and the flange part  112  presses the flange parts  111  and  113 , so that the cooling water supply pipe and the cooling water discharge pipe  82  can be connected to the housing  11 . Therefore, the connection portions of the plurality of pipes  61 ,  81 , and  82  with respect to the housing  11  can be simplified. 
     In the supercharger of the first embodiment, the contact portions  111   b  and  113   b  are provided as rotation prevention mechanisms for preventing the rotation of the cooling water supply pipe  81  with respect to the housing  11 . Therefore, the cooling water supply pipe  81  and the cooling water discharge pipe  82  are prevented from becoming detached by the flange part  112  of the lubricant supply pipe  61  and are prevented from rotating by the rotation prevention mechanisms. Therefore, the cooling water supply pipe  81  and the cooling water discharge pipe  82  can be firmly connected to the housing  11 . 
     In the supercharger of the first embodiment, as the rotation prevention mechanisms, the contact portions  111   b  and  113   b  that come into contact with the lubricant supply pipe  61  are provided in the flange parts  111  and  113  of the cooling water supply pipe  81  and the cooling water discharge pipe  82 . Therefore, the rotation of the cooling water supply pipe  81  and the cooling water discharge pipe  82  can be easily prevented without changing the structure of the cooling water supply pipe  81 . 
     In the first embodiment, a configuration is made such that the flange part  112  of the lubricant supply pipe is fixed to the bearing housing  23  by the fastening bolt  114 , so that the flange part  112  presses the flange parts  111  and  113  of the cooling water supply pipe  81  and the cooling water discharge pipe  82 . However, there is no limitation to this configuration. For example, a configuration may be made such that the flange part  111  of the cooling water discharge pipe  82  and the flange part  112  of the lubricant supply pipe  61  overlap in the thickness direction thereof and both the flange parts  111  and  112  are fixed to the housing  11  by individual fastening bolts. 
     In the supercharger of the first embodiment, the lubricant supply pipe  61 , the cooling water supply pipe  81 , and the cooling water discharge pipe  82  are parallel to each other and are fixed to the housing  11 . Therefore, since the first supply flow path  51 , the cooling water supply flow path  73 , and the cooling water discharge flow path  74  are parallel to each other, the processing of each of the flow paths  51 ,  73 , and  74  with respect to the housing  11  is simplified, so that it is possible to improve the workability and to improve the ease-of-assembly of each of the pipes  61 ,  81 , and  82  to each of the flow paths  51 ,  73 , and  74 . 
     In the supercharger of the first embodiment, the mounting surface  101  on which the first supply flow path  51 , the cooling water supply flow path  73 , and the cooling water discharge flow path  74  are formed is a continuous flat surface without a step. Therefore, it is possible to facilitate the processing of the mounting surface  101  and to improve the workability. 
     In the supercharger of the first embodiment, the flange part  111  of the cooling water discharge pipe  82  and the flange part  112  of the lubricant supply pipe  61  overlap in the thickness direction, the flange part  113  of the cooling water supply pipe  81  and the flange part  112  of the lubricant supply pipe  61  overlap in the thickness direction, the fastening bolt  114  penetrates the flange part  112  and is screwed to the housing  11  to fix the lubricant supply pipe  61  to the housing  11 , the flange part  112  of the lubricant supply pipe  61  presses the flange parts  111  and  113  of the cooling water supply pipe and the cooling water discharge pipe  82  in the insertion direction, and the contact portions  111   b  and  113   b  are provided as rotation prevention mechanisms for preventing the rotation of the cooling water supply pipe  81  and the cooling water discharge pipe  82  with respect to the housing  11 . Therefore, three or more pipes  61 ,  81 , and  82  can be integrated and connected to the housing  11 , and an increase in cost can be suppressed by suppressing an increase in the size of the housing  11 , the occurrence of processing work on the mounting surface  101 , or the like. 
     In the supercharger of the first embodiment, the exhaust turbine supercharger  10  is provided in which the turbine wheel  31  (the turbine  12 ) is provided at one end portion in the axial direction of the rotary shaft  14  and the compressor wheel  33  (the compressor  13 ) is provided at the other end portion in the axial direction. Therefore, in the exhaust turbine supercharger  10 , the plurality of pipes  61 ,  81 , and  82  can be integrated and connected to the housing  11 , and an increase in cost can be suppressed by suppressing an increase in the size of the housing  11 , the occurrence of processing work on the mounting surface, or the like. 
     A method for connecting a pipe in the supercharger of the first embodiment includes a step of inserting the end portions  81   a  and  82   a  of the cooling water supply pipe and the cooling water discharge pipe  82  into the cooling water supply flow path  73  and the cooling water discharge flow path  74  of the housing  11 , a step of inserting the end portion  61   a  of the lubricant supply pipe  61  into the first supply flow path  51  of the housing  11 , and a step of pressing the flange parts  111  and  113  in the insertion direction via the flange part  112  to fix the flange parts  111  and  113  to the housing  11 . 
     Therefore, the plurality of pipes  61 ,  81 , and  82  can be integrated and connected to the housing  11 , and an increase in cost can be suppressed by suppressing an increase in the size of the housing  11 , the occurrence of processing work on the mounting surface  101 , or the like. 
     Second Embodiment 
       FIG. 8  is a perspective view showing a connection portion of a pipe with respect to a housing in an exhaust turbine supercharger of a second embodiment. The basic configuration of the present embodiment is the same as that of the first embodiment described above and will be described using  FIGS. 1 to 3 , and members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. 
     In the second embodiment, as shown in  FIGS. 1 to 3 , in the bearing housing  23  of the exhaust turbine supercharger  10 , mounting surfaces  106  and  107  are formed on the upper portion of the outer peripheral surface, and the mounting surfaces  106  and  107  are flat surfaces having a step  108  therebetween. That is, the second mounting surface  107  is a flat surface far from the first mounting surface  106  on an axis side of the rotary shaft  14 , and the step  108  is provided between the first mounting surface  106  and the second mounting surface  107 . Then, the cooling water supply flow path  73  is formed on the first mounting surface  106 , and the first supply flow path  51  configuring the lubricant supply flow path  42  and the cooling water discharge flow path  74  are formed on the second mounting surface  107 . At this time, the first supply flow path  51 , the cooling water supply flow path  73 , and the cooling water discharge flow path  74  are orthogonal to the mounting surfaces  106  and  107 . Further, the cooling water supply flow path  73 , the first supply flow path  51 , and the cooling water discharge flow path  74  are provided side by side in order along the horizontal direction intersecting the axial direction of the rotary shaft  14 . Then, the lubricant supply pipe  61  is connected to the first supply flow path  51 , the cooling water supply pipe  81  is connected to the cooling water supply flow path  73 , and the cooling water discharge pipe  82  is connected to the cooling water discharge flow path  74 . 
     As shown in  FIG. 8 , in the cooling water supply pipe  81  as a first pipe, a flange part  131  as a first mounting flange is fixed to the end portion  81   a  that is connected to the bearing housing  23 . In the cooling water discharge pipe  82  as a second pipe and the lubricant supply pipe  61  as a second pipe, a flange part  132  as a second mounting flange is fixed to the end portions  82   a  and  61   a  that are connected to the bearing housing  23 . That is, in the second embodiment, a plurality of (in the present embodiment, two) second pipes are provided, and the flange part  132  as a common second mounting flange is fixed to the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61  as the second pipes. 
     The flange part  131  has a rectangular shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  131   a , and a contact portion  131   b  as a rotation prevention mechanism is formed on the outer peripheral portion. The contact portion  131   b  is for preventing the rotation of the cooling water supply pipe with respect to the bearing housing  23 , and has a planar shape following a restricting surface  109  of the bearing housing  23 . The restricting surface  109  is a surface orthogonal to the rotary shaft  14  (refer to  FIG. 1 ) in the axial direction. The flange part  132  has an oval shape, and the cooling water discharge pipe  82  and the lubricant supply pipe  61  are penetrated and fixed to through-holes  132   a  and  132   b  formed in the central portion and on one end portion side, and a mounting hole  132   c  is formed on the other end portion side. 
     The end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  (refer to  FIG. 3 ) that is provided in the bearing housing  23 , and the lower surface of the flange part  131  adheres to the first mounting surface  106  of the bearing housing  23  without any gap. Further, the end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  (refer to  FIG. 3 ) that is provided in the bearing housing  23 , and the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  (refer to  FIG. 2 ) provided in the bearing housing  23 . At this time, the lower surface on one end portion side of the flange part  132  adheres to the upper surface of the flange part  131  of the cooling water supply pipe  81  without any gap, and the other lower surface adheres to the second mounting surface  107  of the bearing housing  23  without any gap. 
     Further, in the bearing housing  23 , the screw hole  105  is formed at a predetermined position. The position in the circumferential direction of the mounting hole  132   c  of the flange part  132  is adjusted so as to overlap the screw hole  105 , and the fastening bolt  114  penetrates the mounting hole  132   c  of the flange part  132  and is screwed into the screw hole  105 . Further, the contact portion  131   b  of the flange part  131  comes into contact with the restricting surface  109  of the bearing housing  23 . 
     Therefore, the cooling water discharge pipe  82  and the lubricant supply pipe  61  are connected to the bearing housing  23  by fixing the common flange part  132  to the second mounting surface  107  by the fastening bolt  114 . In the cooling water supply pipe  81 , the flange part  131  is overlapped below the flange part  132  and is pressed in the insertion direction. Further, in the cooling water supply pipe  81 , the contact portion  131   b  of the flange part  131  comes into contact with the restricting surface  109  of the bearing housing  23  to prevent the rotation of the cooling water supply pipe  81 . Therefore, the cooling water supply pipe  81  is connected to the bearing housing  23  by fixing the flange part  131  to the first mounting surface  106  by means of the bearing housing  23  and the flange part  132 . 
     The rotation prevention mechanism of the cooling water supply pipe  81  is not limited to that described above.  FIG. 9  is a perspective view showing a connection portion of a pipe in a first modification example of the second embodiment, and  FIG. 10  is a perspective view showing a connection portion of a pipe in a second modification example of the second embodiment. 
     In the first modification example of the second embodiment, as shown in  FIG. 9 , a flange part  141  is fixed to the end portion  81   a  of the cooling water supply pipe  81 . A flange part  142  is fixed to the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 . The flange part  141  has a circular shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  141   a . The cooling water supply pipe  81  has a contact portion  141   b  as a rotation prevention mechanism formed on the outer peripheral surface. The flange part  142  has a long plate shape, and the cooling water discharge pipe  82  and the lubricant supply pipe  61  are penetrated and fixed to through-holes  142   a  and  142   b  formed in the central portion, a groove portion  142   c  is formed on one end portion side, and a mounting hole  142   d  is formed on the other end portion side. The contact portion  141   b  of the cooling water supply pipe is for preventing the rotation of the cooling water supply pipe  81  with respect to the bearing housing  23  (refer to  FIG. 8 ), and has a planar shape following an inner surface  142   e  of the groove portion  142   c  of the flange part  142 . 
     Therefore, when the cooling water supply pipe  81 , the cooling water discharge pipe  82 , and the lubricant supply pipe  61  are connected to the bearing housing  23 , the cooling water discharge pipe  82  and the lubricant supply pipe  61  are connected to the bearing housing  23  by fixing the common flange part  142  with the fastening bolt  114  (refer to  FIG. 8 ). In the cooling water supply pipe  81 , the flange part  141  is overlapped below the flange part  142  and is pressed in the insertion direction. Further, in the cooling water supply pipe  81 , the contact portion  141   b  comes into contact with the inner surface  142   e  of the flange part  142  to prevent the rotation of the cooling water supply pipe  81 . Then, the cooling water supply pipe  81  is connected to the bearing housing  23  by fixing the flange part  141  via the flange part  142 . 
     In the second modification example of the second embodiment, as shown in  FIG. 10 , a flange part  151  is fixed to the end portion  81   a  of the cooling water supply pipe  81 . A flange part  152  is fixed to the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 . The flange part  151  has a circular shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  151   a . The cooling water supply pipe  81  has a contact portion  151   b  as a rotation prevention mechanism formed on the outer peripheral surface. The flange part  152  has a long plate shape, and the cooling water discharge pipe  82  and the lubricant supply pipe  61  are penetrated and fixed to through-holes  152   a  and  152   b  formed in the central portion, an end surface  152   c  is formed on one end portion side, and a mounting hole  152   d  is formed on the other end portion side. The contact portion  151   b  of the cooling water supply pipe  81  is for preventing the rotation of the cooling water supply pipe  81  with respect to the bearing housing  23  (refer to  FIG. 8 ), and has a planar shape following the end surface  152   c  of the flange part  152 . 
     Therefore, when the cooling water supply pipe  81 , the cooling water discharge pipe  82 , and the lubricant supply pipe  61  are connected to the bearing housing  23 , the cooling water discharge pipe  82  and the lubricant supply pipe  61  are connected to the bearing housing  23  by fixing the common flange part  152  with the fastening bolt  114  (refer to  FIG. 8 ). In the cooling water supply pipe  81 , the flange part  151  is overlapped below the flange part  152  and is pressed in the insertion direction. Further, in the cooling water supply pipe  81 , the contact portion  151   b  comes into contact with the end surface  152   c  of the flange part  152  to prevent the rotation of the cooling water supply pipe  81 . Then, the cooling water supply pipe  81  is connected to the bearing housing  23  by fixing the flange part  151  via the flange part  152 . 
     In this manner, in the supercharger of the second embodiment, the flange part  131  ( 141  or  151 ) is provided at the end portion  81   a  of the cooling water supply pipe  81 , the common flange part  132  ( 142  or  152 ) is provided at the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 , the end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  of the housing  11 , the end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  of the housing  11 , the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  of the housing  11 , and the flange part  132  presses the flange part  131  in the insertion direction and is fixed to the housing  11 . 
     Therefore, the common flange part  132  is provided at the end portions  82   a  and  61   a  of the plurality of pipes  82  and  61 , and thus it is possible to connect the plurality of pipes  91 ,  82 , and  61  to the housing  11  merely by fixing one flange part  132  to the housing  11 . Therefore, the structure can be simplified and the workability can be improved. 
     In the supercharger of the second embodiment, as the rotation prevention mechanism, the flange part  131  is provided with the contact portion  131   b  which comes into contact with the restricting surface  109  of the housing  11 . Therefore, the rotation of the cooling water supply pipe  81  can be easily prevented without changing the structure of the cooling water supply pipe  81 . 
     In the supercharger of the second embodiment, as the rotation prevention mechanism, the cooling water supply pipe  81  is provided with the contact portion  141   b  ( 151   b ) which comes into contact with the flange part  142  ( 152 ). Therefore, the rotation of the cooling water supply pipe  81  can be easily prevented without changing the structure of the flange part  142  of the cooling water supply pipe  81 . 
     In the supercharger of the second embodiment, the first mounting surface  106  of the housing  11 , in which the cooling water supply flow path  73  is formed, and the second mounting surface  107  of the housing  11 , in which the cooling water discharge flow path  74  and the first supply flow path  51  are formed, are flat surfaces having the step  108  therebetween, the flange part  131  ( 141 ,  151 ) comes into contact with the first mounting surface  106 , and the flange part  132  ( 142 ,  152 ) comes into contact with the second mounting surface  107 . Therefore, even if there is the step  108  between the first mounting surface  106  and the second mounting surface  107 , by bringing the flange part  131  ( 141 ,  151 ) into contact with the first mounting surface  106  and bringing the flange part  132  ( 142 ,  152 ) into contact with the second mounting surface  107 , it is possible to connect the plurality of pipes  81 ,  82 , and  61  to the housing  11  and to integrate and connect the plurality of pipes  81 ,  82 , and  61  to the housing  11  regardless of the shape of the housing  11 . 
     In the second embodiment, the common flange part  132  ( 142 ,  152 ) is provided at the cooling water discharge pipe  82  and at the lubricant supply pipe  61  as a plurality of second pipes in the present invention. However, a common flange part may be provided at the end portions of a plurality of first pipes in the present invention. 
     Third Embodiment 
       FIG. 11  is a perspective view showing a connection portion of a pipe in an exhaust turbine supercharger of a third embodiment, and  FIG. 12  is a perspective view showing the connection portion of the pipe with respect to the housing. Members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. 
     In the third embodiment, as shown in  FIGS. 11 and 12 , in the bearing housing  23  of the exhaust turbine supercharger, the first mounting surface  106  and the second mounting surface  107  are formed on an upper portion of the outer peripheral surface, and the step  108  is provided between the first mounting surface  106  and the second mounting surface  107 . Then, the first supply flow path  51  (refer to  FIG. 2 ) and the cooling water supply flow path  73  (refer to  FIG. 3 ) are formed on the first mounting surface  106 , and the cooling water discharge flow path  74  (refer to  FIG. 3 ) and the first supply flow path  51  are formed on the second mounting surface  107 . 
     In the cooling water supply pipe  81 , a flange part  161  as a first mounting flange is fixed to the end portion  81   a . In the cooling water discharge pipe  82  and the lubricant supply pipe  61 , a common flange part  162  as a second mounting flange is fixed to the end portions  82   a  and  61   a.    
     The flange part  161  has a rectangular shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  161   a , and a contact portion  161   b  as a rotation prevention mechanism is formed in the outer peripheral portion. The contact portion  161   b  is for preventing the rotation of the cooling water supply pipe  81  with respect to the bearing housing  23 , and is formed as a cutout portion. The bearing housing  23  has a protrusion  165  formed on the second mounting surface  107 , and the contact portion  161   b  can come into contact with the protrusion  165 . The flange part  162  has a long plate shape, and the cooling water discharge pipe  82  and the lubricant supply pipe  61  are penetrated and fixed to through-holes  162   a  and  162   b  formed in the central portion and on one end portion side, and a mounting hole  162   c  is formed on the other end portion side. 
     The end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  of the bearing housing  23 , and the lower surface of the flange part  161  adheres to the first mounting surface  106  of the bearing housing  23  without any gap. The end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  of the bearing housing  23 , and the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  of the bearing housing  2 . At this time, the lower surface on one end portion side of the flange part  162  adheres to the upper surface of the flange part  161  of the cooling water supply pipe  81  without any gap, and the other lower surface adheres to the second mounting surface  107  of the bearing housing  23  without any gap. Further, the fastening bolt  114  penetrates the mounting hole  162   c  of the flange part  162  and is screwed into the screw hole  105 . Further, in the flange part  161 , the contact portion  161   b  comes into contact with the protrusion  165  formed on the first mounting surface  106  of the bearing housing  23 . 
     Therefore, the cooling water discharge pipe  82  and the lubricant supply pipe  61  are connected to the bearing housing  23  by fixing the common flange part  162  to the second mounting surface  107  via the fastening bolt  114 . In the cooling water supply pipe  81 , the flange part  161  is overlapped below the flange part  162  and is pressed in the insertion direction. Further, in the cooling water supply pipe  81 , the contact portion  161   b  of the flange part  161  comes into contact with the protrusion  165  of the bearing housing  23  to prevent the rotation of the cooling water supply pipe  81 . Therefore, the cooling water supply pipe  81  is connected to the bearing housing  23  by being fixed to the first mounting surface  106  by means of the bearing housing  23  and the flange part  162 . 
     In this manner, in the supercharger of the third embodiment, the flange part  161  is provided at the end portion  81   a  of the cooling water supply pipe  81 , the common flange part  162  is provided at the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 , the end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  of the housing  11 , the end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  of the housing  11 , the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path of the housing  11 , the flange part  162  presses the flange part  161  in the insertion direction and is fixed to the housing  11 , and the contact portion  161   b  of the flange part  161  comes into contact with the protrusion  165  of the housing  11 . 
     Therefore, the common flange part  162  is provided at the end portions  82   a  and  61   a  of the plurality of pipes  82  and  61 , and thus it is possible to connect the plurality of pipes  91 ,  82 , and  61  to the housing  11  merely by fixing one flange part  162  to the housing  11 . Therefore, the structure can be simplified and the workability can be improved. 
     Fourth Embodiment 
       FIG. 13  is a perspective view showing a connection portion of a pipe in an exhaust turbine supercharger of a fourth embodiment,  FIG. 14  is a perspective view showing the connection portion of the pipe with respect to the housing, and  FIG. 15  is a sectional view showing a connection portion of the pipe. Members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. 
     In the fourth embodiment, as shown in  FIGS. 13 and 14 , a flange part  171  is fixed to the end portion  81   a  of the cooling water supply pipe  81 . A flange part  172  is fixed to the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 . The flange part  171  has a rectangular shape, and the cooling water supply pipe  81  is penetrated and fixed to a through-hole  171   a , and a contact portion  171   b  as a rotation prevention mechanism is formed at the outer peripheral portion. The contact portion  171   b  is for preventing the rotation of the cooling water supply pipe  81  with respect to the bearing housing  23 , and is formed in a claw shape. The bearing housing  23  has a recessed portion  175  formed on the second mounting surface  107 , and the contact portion  171   b  can come into contact with the recessed portion  175 . The flange part  172  has a long plate shape, and the cooling water discharge pipe  82  and the lubricant supply pipe  61  are penetrated and fixed to through-holes  172   a  and  172   b  formed in the central portion and on one end portion side, and a mounting hole  172   c  is formed on the other end portion side. 
     The end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  of the bearing housing  23 , and the lower surface of the flange part  171  adheres to the first mounting surface  106  of the bearing housing  23  without any gap. The end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  of the bearing housing  23 , and the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path  51  of the bearing housing  2 . At this time, the lower surface on one end portion side of the flange part  172  adheres to the upper surface of the flange part  171  of the cooling water supply pipe  81  without any gap, and the other lower surface adheres to the second mounting surface  107  of the bearing housing  23  without any gap. Further, the fastening bolt  114  penetrates the mounting hole  162   c  of the flange part  162  and is screwed into the screw hole  105 . Further, in the flange part  161 , the contact portion  161   b  comes into contact with the recessed portion  175  formed on the first mounting surface  106  of the bearing housing  23 . 
     As shown in  FIG. 15 , the contact portion  161   b  is formed by bending a protrusion piece protruding outward from the outer peripheral portion of the flange part  171  toward the second mounting surface  107  side at an angle larger than 90 degrees. On the other hand, the recessed portion  175  is formed from the second mounting surface  107  of the bearing housing  23  along an inclination direction approaching the cooling water supply flow path  73  with respect to the axial direction of the cooling water supply flow path  73 . The bending direction of the contact portion  161   b  and the inclination direction of the recessed portion  175  are substantially the same. When the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  and the flange part  171  comes into contact with the second mounting surface  107 , the contact portion  161   b  is elastically deformed to come into contact with the recessed portion  175 . Here, the contact portion  161   b  comes into contact with the recessed portion  175 , so that the cooling water supply pipe  81  is not only prevented from rotating with respect to the bearing housing  23 , but also prevented from becoming detached. 
     Therefore, as shown in  FIG. 14 , the cooling water discharge pipe  82  and the lubricant supply pipe  61  are connected to the bearing housing  23  by fixing the common flange part  172  to the second mounting surface  107  via the fastening bolt  114 . In the cooling water supply pipe  81 , the flange part  171  is overlapped below the flange part  172  and is pressed in the insertion direction. Further, in the cooling water supply pipe  81 , the contact portion  171   b  of the flange part  171  comes into contact with the recessed portion  175  of the bearing housing  23  to prevent the rotation of the cooling water supply pipe  81 . Therefore, the cooling water supply pipe  81  is connected to the bearing housing  23  by being fixed to the first mounting surface  106  by means of the bearing housing  23  and the flange part  172 . 
     In this manner, in the supercharger of the fourth embodiment, the flange part  171  is provided at the end portion  81   a  of the cooling water supply pipe  81 , the common flange part  172  is provided at the end portions  82   a  and  61   a  of the cooling water discharge pipe  82  and the lubricant supply pipe  61 , the end portion  81   a  of the cooling water supply pipe  81  is inserted into the cooling water supply flow path  73  of the housing  11 , the end portion  82   a  of the cooling water discharge pipe  82  is inserted into the cooling water discharge flow path  74  of the housing  11 , the end portion  61   a  of the lubricant supply pipe  61  is inserted into the first supply flow path of the housing  11 , the flange part  172  presses the flange part  171  in the insertion direction and is fixed to the housing  11 , and the contact portion  171   b  of the flange part  171  comes into contact with the recessed portion  175  of the housing  11 . 
     Therefore, the common flange part  172  is provided at the end portions  82   a  and  61   a  of the plurality of pipes  82  and  61 , so that it is possible to connect the plurality of pipes  91 ,  82 , and  61  to the housing  11  merely by fixing one flange part  172  to the housing  11 . Therefore, the structure can be simplified and the workability can be improved. 
     Fifth Embodiment 
       FIG. 16  is a sectional view showing an electric supercharger of a fifth embodiment, and  FIG. 17  is a sectional view showing a connection portion of a pipe with respect to a housing. 
     As shown in  FIG. 16 , an electric supercharger  200  as the supercharger according to the present invention includes a housing  211 , an electric motor  212 , a compressor  213 , a rotary shaft  214 , and an inverter  215 . 
     The housing  211  is formed so as to have a hollow inside in which the rotary shaft  214  is disposed, and the rotary shaft  214  is rotatably supported by bearings  221  and  222 . A rotor  223  is fixed to the outer peripheral portion of the rotary shaft  214 , while a stator  224  is fixed to the inner peripheral portion of the housing  211 . The rotor  223  and the stator  224  face each other in the radial direction with a predetermined gap therebetween. The electric motor  212  is composed of the rotor  223  and the stator  224 . Further, a compressor wheel  225  of the compressor  213  is fixed to one end portion in the axial direction of the rotary shaft  214 . The housing  211  is provided with an air intake port  226  and a compressed air discharge port  227  with respect to the compressor wheel  225 . Therefore, air as a combustion gas taken in from the air intake port  226  is compressed by the compressor wheel  225  that is driven and rotated, and is discharged as compressed air from the compressed air discharge port  227 . Further, the rotary shaft  214  is provided with the inverter  215  at the other end portion in the axial direction. 
     In the electric supercharger  200  configured in this manner, the rotary shaft  214  is driven and rotated by the electric motor  212 , the rotation of the rotary shaft  214  is transmitted to the compressor  13 , so that the compressor  13  is driven, and the compressor  13  compresses air and supplies it to the intake system of the internal combustion engine. 
     The electric supercharger  200  is provided with the inverter  215  that controls the driving of the electric motor  212 . Since the inverter  215  generates heat, the housing  211  is provided with a cooling device  231  that circulates cooling water (a refrigerant) inside. The cooling device  231  has a cooling water annular flow path (refrigerant flow path)  232 , a cooling water supply flow path (refrigerant supply hole)  233 , and a cooling water discharge flow path (refrigerant discharge hole)  234  formed in the housing  211 . 
     The cooling water annular flow path  232  is provided on the inverter  215  side in the housing  211 . That is, the cooling water annular flow path  232  is provided along the circumferential direction on the outer side in the radial direction of the bearing  222  in the housing  211 . The cooling water annular flow path  232  is a flow path that is continuous in the circumferential direction. However, it is interrupted by providing an end portion at the upper portion of the housing  211 . The cooling water supply flow path  233  and the cooling water discharge flow path  234  are provided along the radial direction at the upper portion of the housing  211 . The cooling water supply flow path  233  and the cooling water discharge flow path  234  are provided side by side in the circumferential direction of the housing  211 . 
     The housing  211  has a mounting surface  240  formed on the upper portion of the outer peripheral surface. The cooling water supply flow path  233  and the cooling water discharge flow path  234  are provided so as to be open in a direction orthogonal to the mounting surface  240 . The cooling water supply flow path  233  and the cooling water discharge flow path  234  are provided side by side in order along the horizontal direction intersecting the axial direction of the rotary shaft  214 . A tip portion of the cooling water supply flow path  233  communicates with one end portion of the cooling water annular flow path  232  through a connection flow path  235 . The cooling water discharge flow path  234  communicates with the other end portion of the cooling water annular flow path  232  through a connection flow path  236 . 
     One end portion of a cooling water supply pipe  241  is connected to the discharge side of a cooling water pump (not shown), and the other end portion is connected to the cooling water supply flow path  233 . One end portion of a cooling water discharge pipe  242  is connected to the cooling water discharge flow path  234 , and the other end portion is connected to the suction side of the cooling water pump. 
     As shown in  FIG. 17 , in the cooling water supply pipe  241 , a flange part  151  as a first mounting flange is fixed to an end portion  241   a  that is connected to the housing  211 . In the cooling water discharge pipe  242 , a flange part  252  as a second mounting flange is fixed to an end portion  242   a  that is connected to the housing  211 . 
     The flange part  251  is fixed by penetrating the cooling water supply pipe  241  through a through-hole  251   a , and a contact portion  251   b  as a rotation prevention mechanism is formed at the outer peripheral portion. The contact portion  251   b  is for preventing the rotation of the cooling water supply pipe  241  with respect to the housing  211 , and is a recessed portion having a curved shape following the outer peripheral surface of the cooling water discharge pipe  242 . The flange part  252  is fixed by penetrating the cooling water discharge pipe  242  through a through-hole  252   a  formed on one end portion side, and a mounting hole  252   b  is formed on the other end portion side. 
     The end portion  241   a  of the cooling water supply pipe  241  is inserted into the cooling water supply flow path  233  of the housing  211 , and the lower surface of the flange part  251  adheres to the mounting surface  240  of the housing  211  without any gap. The end portion  242   a  of the cooling water discharge pipe  242  is inserted into the cooling water discharge flow path  234  of the housing  211 , the lower surface on one end portion side of the flange part  252  adheres to the upper surface of the flange part  251  of the cooling water supply pipe  241  without any gap, and the other lower surface adheres to the mounting surface  240  of the housing  211  without any gap. Further, a fastening bolt  253  penetrates the mounting hole  252   b  of the flange part  252  and is screwed into the screw hole  254 . Further, in the flange part  251 , the contact portion  251   b  comes into contact with the outer peripheral surface of the cooling water discharge pipe  242 . 
     Therefore, the cooling water discharge pipe  242  is connected to the housing  211  by fixing the flange part  252  to the mounting surface  240  via the fastening bolt  253 . In the cooling water supply pipe  241 , the flange part  251  is overlapped below the flange part  252  and is pressed in the insertion direction of the cooling water supply pipe  241 . Further, in the cooling water supply pipe  241 , the contact portion  251   b  of the flange part  251  comes into contact with the outer peripheral surface of the cooling water discharge pipe  242  to prevent the rotation of the cooling water supply pipe  241 . Therefore, the cooling water supply pipe  241  is connected to the housing  211  by fixing the flange part  151  to the mounting surface  240  by means of the cooling water discharge pipe  242  and the flange part  152 . 
     In this manner, the supercharger of the fifth embodiment is the electric supercharger  200  that includes the electric motor  212  that drives and rotates the rotary shaft  214 , the compressor  13  having the compressor wheel  33  provided at one end portion in the axial direction of the rotary shaft  14 , and the inverter  215  that controls the driving of the electric motor  212 . 
     Therefore, in the electric supercharger  200 , a plurality of pipes  241  and  242  can be integrated and connected to the housing  211 , and an increase in cost can be suppressed by suppressing an increase in the size of the housing  211 , the occurrence of processing work on the mounting surface  240 , or the like. 
     In the embodiments described above, in the exhaust turbine supercharger  10 , the lubricant supply pipe  61 , the cooling water supply pipe  81 , and the cooling water discharge pipe  82  as pipes are integrated and connected to the upper portion of the housing  11 , and in the electric supercharger  200 , the cooling water supply pipe  241  and the cooling water discharge pipe  242  as pipes are integrated and connected to the upper portion of the housing  211 . However, there is no limitation to these configurations. For example, in the exhaust turbine supercharger  10 , only the cooling water supply pipe  81  and the cooling water discharge pipe  82  as pipes may be integrated and connected to the lower portion of the housing  11 . Further, in the exhaust turbine supercharger  10 , the lubricant supply pipe  61  and the lubricant discharge pipe  62  as pipes may be integrated and connected to the lower portion of the housing  11 , and in addition, the cooling water supply pipe  81  or the cooling water discharge pipe  82  may be integrated and connected to the lower portion of the housing  11 . 
     Further, in the embodiment described above, a configuration is made such that the mounting flange that is provided at the pipe is fastened to the housing by the fastening bolt  114 . However, there is no limitation to this configuration. For example, a configuration may be made such that the mounting flange that is provided at the pipe is fixed to the housing by using the configuration of the contact portion  171   b  of the flange part  171  and the recessed portion  175  of the bearing housing  23  of the fourth embodiment. That is, instead of the fastening bolt  114  and the screw hole  115  of the first embodiment, the contact portion  171   b  and the recessed portion  175  may be used. 
     Further, in the embodiments described above, the mounting surfaces  101 ,  106 , and  107  of the bearing housing  23  are horizontal surfaces. However, they may be inclined or curved surfaces. In this case, the flow paths  51 ,  73 , and  74  may be orthogonal to the mounting surface or may be inclined with respect to the mounting surface. Further, in a case where the plurality of flow paths  51 ,  73 , and  74  are provided on the mounting surface, a mounting surface having a different angle may be provided for each of the flow paths  51 ,  73 , and  74 . 
     REFERENCE SIGNS LIST 
     
         
         
           
               10 : exhaust turbine supercharger 
               11 : housing 
               12 : turbine 
               13 : compressor 
               14 : rotary shaft 
               21 : turbine housing 
               22 : compressor housing 
               23 : bearing housing 
               24 ,  25 : journal bearing 
               26 : thrust bearing 
               41 : oil supply device 
               42 : lubricant supply flow path 
               43 : lubricant discharge flow path 
               51 : first supply flow path (lubricant supply hole) 
               52 : second supply flow path 
               53 : third supply flow path 
               54 : fourth supply flow path 
               55 : fifth supply flow path 
               56 : first discharge flow path 
               57 : second discharge flow path 
               61 : lubricant supply pipe (second pipe) 
               61   a : end portion 
               62 : lubricant discharge pipe 
               71 : cooling device 
               72 : cooling water annular flow path (refrigerant flow path) 
               73 : cooling water supply flow path (refrigerant supply hole) 
               74 : cooling water discharge flow path (refrigerant discharge hole) 
               75 ,  76 : connection flow path 
               81 : cooling water supply pipe (first pipe, third pipe) 
               81   a : end portion 
               82 : cooling water discharge pipe (first pipe) 
               82   a : end portion 
               101 : mounting surface 
               105 : screw hole 
               106 : first mounting surface 
               107 : second mounting surface 
               108 : step 
               109 : restricting surface 
               111 ,  131 ,  141 ,  151 ,  161 ,  171 : flange part (first mounting flange) 
               112 ,  132 ,  142 ,  152 ,  162 ,  172 : flange part (second mounting flange) 
               113 : flange part (first mounting flange, third mounting flange) 
               113   b ,  131   b ,  141   b ,  151   b ,  161   b ,  171   b : contact portion 
               114 : fastening bolt 
               200 : electric supercharger 
               211 : housing 
               212 : electric motor 
               213 : compressor 
               214 : rotary shaft 
               215 : inverter 
               231 : cooling device 
               232 : cooling water annular flow path (refrigerant flow path) 
               233 : cooling water supply flow path (refrigerant supply hole) 
               234 : cooling water discharge flow path (refrigerant discharge hole) 
               235 ,  236 : connection flow path 
               240 : mounting surface 
               241 : cooling water supply pipe (first pipe, third pipe) 
               241   a : end portion 
               242 : cooling water discharge pipe (first pipe) 
               242   a : end portion 
               251 : flange part (first mounting flange) 
               251   b : contact portion 
               252 : flange part (second mounting flange) 
               253 : fastening bolt 
               254 : screw hole