Patent Publication Number: US-7213578-B2

Title: Structure and fixing member for mounting fuel injection valve

Description:
CROSS REFERENCE TO RELATED APPLICATION 
   This application is based on and incorporates herein by reference Japanese Patent Application No. 2004-94998 filed on Mar. 29, 2004. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a mounting structure and a fixing member for mounting a fuel injection valve to an internal combustion engine. 
   2. Description of Related Art 
   A technology disclosed in JP-A-H09-88765 (Patent Document 1) is publicly known as a mounting structure of a fuel injection valve in an engine, for instance. In the technology of Patent Document 1, a fixing member is attached to an end of the fuel injection valve on a side opposite from a combustion chamber so that the fuel injection valve is held between the fixing member and a cylinder head. In this case, in order to respond to a pressure in the combustion chamber, the fixing member is formed by a member having relatively high rigidity and is fixed to the cylinder head with a screw member. 
   In the case of a direct injection type engine, which injects fuel directly into a combustion chamber of the engine, the fuel injection valve should be preferably disposed in a central part of the combustion chamber in order to improve engine efficiency. However, in the case where the fuel injection valve is disposed in the central part of the combustion chamber, the fuel injection valve needs to be inserted deeply into the cylinder head so that the fuel injection valve penetrates the cylinder head. Moreover, recently, equipments are densely arranged around the engine. Therefore, in the case where the fixing member, of which a flange extends from the hole of the cylinder head, and the screw member for fixing the fixing member to the cylinder head are used as in the technology of Patent Document 1, it is difficult to ensure spaces for installing the fixing member and the screw member. 
   The fuel injection valve is operated by electric power supplied to an electromagnetic drive portion. Therefore, the fuel injection valve has a connector, which is connected with a power source. However, in the case where the fuel injection valve is inserted deeply into the cylinder head, it is difficult to connect the connector with the power source, and it is difficult to ensure an accommodation portion for accommodating the connector. 
   SUMMARY OF THE INVENTION 
   It is therefore an object of the present invention to provide a mounting structure of a fuel injection valve capable of facilitating fixation of the fuel injection valve and connection between the fuel injection valve and a power source and of reducing a volume necessary for installing the fuel injection valve even in the case where the fuel injection valve is inserted deeply into a cylinder head. 
   It is another object of the present invention to provide a fixing member capable of facilitating fixation of a fuel injection valve and connection between the fuel injection valve and a power source and of reducing a volume necessary for installing the fuel injection valve even in the case where the fuel injection valve is inserted deeply into a cylinder head. 
   According to an aspect of the present invention, a fuel injection valve is pressed in an axial direction between a fixing member and a cylinder head. Therefore, in the case where the fuel injection valve is inserted deeply into the cylinder head, the fuel injection valve is pressed against the cylinder head through the fixing member. Accordingly, the fuel injection valve can be fixed easily. A first connector of the fuel injection valve is electrically connected with a second connector disposed radially outside the fixing member. Therefore, the first connector of the fuel injection valve, which is inserted into a deep hole, is connected with the second connector, which is inserted into the hole together with the fixing member. An end of the second connector opposite from the first connector is disposed outside the hole of the cylinder head. Therefore, the fuel injection valve can be easily connected with a power source even in the case where the fuel injection valve is inserted deeply into the cylinder head. Moreover, the first connector is connected with the power source through the second connector. Therefore, the first connector can be formed in a simple shape. As a result, a volume necessary for installing the fuel injection valve having the first connector can be reduced. 
   According to another aspect of the present invention, a fixing member presses a fuel injection valve in an axial direction between the fixing member and a cylinder head. Therefore, the fuel injection valve is pressed against the cylinder head through the fixing member in the case where the fuel injection valve is inserted deeply into the cylinder head. Thus, the fuel injection valve can be fixed easily. A first connector of the fuel injection valve is electrically connected with a second connector disposed radially outside the fixing member. Therefore, the first connector of the fuel injection valve, which is inserted into a deep hole, is connected with the second connector, which is inserted into the hole together with the fixing member. An end of the second connector opposite from the first connector is disposed outside the hole of the cylinder head. Therefore, the fuel injection valve can be easily connected with a power source even in the case where the fuel injection valve is inserted deeply into the cylinder head. Moreover, the first connector is connected with the power source through the second connector. Therefore, the first connector can be formed in a simple shape. As a result, a volume necessary for installing the fuel injection valve having the first connector can be reduced. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Features and advantages of embodiments will be appreciated, as well as methods of operation and the function of the related parts, from a study of the following detailed description, the appended claims, and the drawings, all of which form a part of this application. In the drawings: 
       FIG. 1  is a sectional view showing a mounting structure of an injector according to a first embodiment of the present invention; 
       FIG. 2  is a sectional view showing a substantial portion of the mounting structure of the injector according to the first embodiment; 
       FIG. 3  is an enlarged sectional view showing a substantial portion of the mounting structure of the injector of  FIG. 2 ; 
       FIG. 4  is a sectional view showing the mounting structure of the injector according to the first embodiment at a time when the injector is mounted; 
       FIG. 5A  is a view showing a fixing member used in the mounting structure of the injector according to the first embodiment; 
       FIG. 5B  is a view showing the fixing member used in the mounting structure of the injector according to the first embodiment; 
       FIG. 6A  is a view showing a fixing member used in a mounting structure of an injector according to a second embodiment of the present invention; 
       FIG. 6B  is a view showing the fixing member used in the mounting structure of the injector according to the second embodiment; 
       FIG. 7A  is a view showing a fixing member used in a mounting structure of an injector according to a third embodiment of the present invention; 
       FIG. 7B  is a view showing the fixing member used in the mounting structure of the injector according to the third embodiment; 
       FIG. 8  is a sectional view showing a fixing member used in a mounting structure of an injector according to a fourth embodiment of the present invention; 
       FIG. 9  is a sectional view showing a mounting structure of an injector according to a fifth embodiment of the present invention; and 
       FIG. 10  is a sectional view showing a substantial portion of a mounting structure of an injector of a modified example of the present invention. 
   

   DETAILED DESCRIPTION OF THE REFERRED EMBODIMENTS 
   (First Embodiment) 
   Referring to  FIG. 1 , a mounting structure of a fuel injection valve according to a first embodiment of the present invention applied to an internal combustion engine (a direct injection type gasoline engine)  10  is illustrated. 
   As shown in  FIG. 1 , the engine  10  includes a cylinder block  11  and a cylinder head  12 . The cylinder block  11  provides a cylinder  13 . The cylinder block  11  and the cylinder head  12  are formed by casting the iron, the aluminum alloy and the like. The cylinder  13  holds a piston  14  so that the piston  14  can reciprocate. An inner wall of the cylinder block  11  providing the cylinder  13 , an end surface of the piston  14  on a cylinder head  12  side and an end surface of the cylinder head  12  on a piston  14  side define a combustion chamber  15 . 
   The cylinder head  12  is formed with an intake passage  16  and an exhaust passage  17 . The intake passage  16  and the exhaust passage  17  can communicate with the combustion chamber  15  respectively. An end of the intake passage  16  on a combustion chamber  15  side is opened or closed by an intake valve  18 . An end of the exhaust passage  17  on a combustion chamber  15  side is opened or closed by an exhaust valve  19 . 
   The cylinder head  12  is formed with a hole  20  between the intake valve  18  and the exhaust valve  19 . The hole  20  penetrates the cylinder head  12  in a thickness direction of the cylinder head  12 . The engine.  10  has a fuel injection valve (an injector)  30 , which is accommodated in the hole  20 . As shown in  FIG. 2 , the hole  20  provided by the cylinder head  12  includes a large diameter portion  21 , an intermediate diameter portion  22  and a small diameter portion  23 , of which internal diameters are different from each other. The small diameter portion  23 , the intermediate diameter portion  22  and the large diameter portion  21  are arranged in that order in an axial direction from the combustion chamber  15  side. The internal diameter of the intermediate diameter portion  22  is larger than that of the small diameter portion  23  and is smaller than that of the large diameter portion  21 . Thus, a stepped portion  24  is provided between the large diameter portion  21  and the intermediate diameter portion  22 , and a stepped portion  25  is provided between the intermediate diameter portion  22  and the small diameter portion  23 . The hole  20  is formed with an enlarged portion  26 , which enlarges radially outward, in a part of the large diameter portion  21 . 
   As shown in  FIG. 2 , the injector  30  includes a nozzle  31 , a flange  32 , an electromagnetic drive portion  33 , a supply portion  34 , a connector portion  40  as a first connector, and the like. An injection hole  35  is formed in an end of the nozzle  31  on the combustion chamber  15  side. The nozzle  31  is inserted into the small diameter portion  23  of the hole  20 . A sealing member  36  is interposed between the inner wall of the cylinder head  12 , which provides the hole  20 , and the nozzle  31 . The sealing member  36  is made of a heat-resistant resin such as a resin containing fluorine. The sealing member  36  prevents leak of a gas mixture or a combustion gas from the combustion chamber  15  to the outside of the cylinder head  12 . The flange  32  strikes the stepped portion  24  across a sealing member  37 . Thus, an axial position of the injector  30  is determined. The sealing member  37  and the sealing member  36  prevent the leak of the gas mixture or the combustion gas from the combustion chamber  15  to the outside of the cylinder head  12 . 
   A valve member such as a needle driven by the electromagnetic drive portion  33  is accommodated in the injector  30 . The valve member reciprocates in the axial direction of the injector  30 . The electromagnetic drive portion  33  includes a coil for generating an electromagnetic attraction for driving the valve member, and the like. Energization of the coil is turned on and off to reciprocate the valve member in the axial direction of the injector  30 . Thus, the injection hole  35  is opened and closed. 
   The connector portion  40  is provided so that the connector portion  40  protrudes radially outward from the electromagnetic drive portion  33 . The connector portion  40  includes a terminal  41  and a wiring member  42  as shown in  FIG. 3 . The wiring member  42  electrically connects the terminal  41  with the coil of the electromagnetic drive portion  33 . The connector portion  40  is formed by a resin integrally with the injector  30  while the terminal  41  and the wiring member  42  are inserted into the connector portion  40 . The connector portion  40  is accommodated in the enlarged portion  26  of the cylinder head  12 . 
   As shown in  FIG. 2 , the supply portion  34  is disposed on a side of the electromagnetic drive portion  33  opposite from the injection hole  35 . The fuel is supplied to the injector  30  from a fuel tank through a pipe member  50  of a fuel supply section and a fixing member  60 . The fuel supplied through the pipe member  50  and the fixing member  60  flows into the supply portion  34  of the injector  30 . The fuel flowing into the supply portion  34  flows through an inside of the injector  30  and is injected into the combustion chamber  15  through the injection hole  35 . The pipe member  50  is formed in a cylindrical shape and is formed with a fuel passage  51  inside. 
   The fixing member  60  is disposed substantially coaxially with the hole  20 , the injector  30  and the pipe member  50 . The fixing member  60  holds the injector  30  between the pipe member  50  and the cylinder head  12 . The fixing member  60  has a cylinder portion  62  providing a fuel passage  61  inside. The cylinder portion  62  accommodates a part of the injector  30 . A part of the fixing member  60  with respect to the axial direction is accommodated in the hole  20  of the cylinder head  12 . An end of the fixing member  60  on the combustion chamber  15  side with respect to the axial direction provides a contacting portion  63 . The contacting portion  63  contacts the flange  32  of the injector  30 . The other end of the fixing member  60  opposite from the contacting portion  63  is inserted into an inner peripheral side of the pipe member  50 . The pipe member  50  is disposed on a side of the cylinder head  12  opposite from the cylinder block  11 . Therefore, the fixing member  60  is held between the pipe member  50  and the cylinder head  12  by interposing the fixing member  60  between the pipe member  50  and the cylinder head  12 . At that time, a load pressing the fixing member  60  against the cylinder head  12  is applied to the fixing member  60 . As a result, the injector  30  is held between the fixing member  60  and the cylinder head  12  and pressed against the cylinder head  12 . 
   The supply portion  34  of the injector  30  is positioned in an intermediate portion of the fixing member  60  with respect to the axial direction. A sealing member  38  seals a space between the injector  30  and the fixing member  60 . The fixing member  60  is formed with an opening portion  64  in the cylinder portion  62  as shown in  FIGS. 2 and 4 . The connector portion  40  of the injector  30  radially penetrates the opening portion  64 . Thus, the connector portion  40  protruding from the injector  30  is inserted into the opening portion  64  when the fixing member  60  is mounted from a side of the injector  30  opposite from the cylinder head  12 . Thus, interference between the injector  30  and the fixing member  60  can be prevented when the fixing member  60  is mounted. The opening portion  64  is formed at a position between the combustion chamber  15  and a position where the sealing member  38  of the injector  30  contacts the inner wall of the fixing member  60 . Thus, the fuel flowing through the fuel passage  61  can be prevented from flowing out along the outer wall of the injector  30 . 
   The fixing member  60  has a connector portion  70  as a second connector connected with the connector portion  40  of the injector  30  as shown in  FIG. 2 . The connector portion  70  includes a first socket  71 , a second socket  72  and a body portion  73 . The first socket  71  is provided with a terminal  74  as a first terminal connected with a wiring portion, which supplies electric power from the power source. The first socket  71  is disposed outside the cylinder head  12 . More specifically, the first socket  71  is exposed to the outside of the cylinder head  12 . 
   The second socket  72  is provided with a socket terminal  75  as a second terminal electrically connected with the terminal  41  of the injector  30 . The terminal  74  and the socket terminal  75  are respectively made of an electrically conductive material. The terminal  74  and the socket terminal  75  are electrically connected with each other by a wiring member  76 . The socket terminal  75  is formed substantially in the shape of a cup as shown in  FIG. 3 . The socket terminal  75  is fitted with the terminal  41  by inserting the terminal  41  of the injector  30  into the socket terminal  75 . The terminal  74  connected with the power source is electrically connected with the coil of the electromagnetic drive portion  33  by connecting the connector portion  70  of the fixing member  60  to the connector portion  40  of the injector  30 . A sealing member  77  is disposed between the connector portion  70  of the fixing member  60  and the connector portion  40  of the injector  30 . The sealing member  77  prevents intrusion of water or oil into the connector portion  40  or the connector portion  70 . 
   The body portion  73  as a resin molding circumferentially surrounds the periphery of the fixing member  60  and is fixed to the fixing member  60 . The terminal  74  of the first socket  71 , the socket terminal  75  of the second socket  72  and the wiring member  76  are inserted into the resin forming the body portion  73 . The fixing member  60  is formed with a small diameter portion  65 , of which an outer diameter is reduced, as shown in  FIG. 5A . The connector portion  70  is formed as the resin molding integrated with the fixing member  60  by forming the body portion  73  around the periphery of the small diameter portion  65  so that the fixing member  60  is inserted as shown in  FIG. 5B . 
   As shown in  FIG. 2 , the pipe member  50  provides the fuel passage  51  inside. The end of the fixing member  60  opposite from the combustion chamber  15  is inserted into the pipe member  50 . A sealing member  52  for sealing the flow of the fuel is interposed between the fixing member  60  and the pipe member  50 . The sealing member  52  prevents the fuel supplied from the pipe member  50  from flowing toward the combustion chamber  15  along the outer wall of the fixing member  60 . Thus, the fuel supplied from the pipe member  50  flows to the supply portion  34  of the injector  30  along the inner peripheral side of the fixing member  60 . 
   A spring  53  as a resilient member is interposed between the end of the pipe member  50  on the combustion chamber  15  side and the fixing member  60 . The spring  53  can extend and contract in the axial direction. When the pipe member  50  and the fixing member  60  make relative movement in the axial direction, the spring  53  absorbs the movement. The spring  53  also absorbs a dimensional tolerance of the fixing member  60  or a tolerance of a distance between the pipe member  50  and the cylinder head  12 . Instead of the spring  53  as the resilient member, an elastic member made of a resin such as rubber may be employed. A structure for applying a force to the spring  53  for extending in the axial direction so that the spring  53  presses the fixing member  60  against the cylinder head  12  may be employed. 
   Next, a method of mounting the injector  30  to the cylinder head  12  will be explained. 
   The injector  30  is inserted into the hole  20  when the injector  30  is mounted to the cylinder head  12 . Since the sealing member  36  is fitted to the nozzle  31  of the injector  30 , the nozzle  31  is press-fitted into the small diameter portion  23 . The sealing member  37  is placed on the stepped portion  24  before the injector  30  is inserted. The injector  30  is inserted until the flange  32  contacts the sealing member  37  placed on the stepped portion  24 . The axial movement of the injector  30  is limited and the axial position of the injector  30  is determined because the flange  32  contacts the sealing member  37  placed on the stepped portion  24 . 
   The fixing member  60  is placed around the outer periphery of the injector  30  after the injector  30  is inserted into the hole  20 . The cylinder portion  62  of the fixing member  60  is interposed between the outer wall of the injector  30  and the inner wall of the cylinder head  12 , which provides the hole  20 . The internal diameter of the fixing member  60  is slightly larger than the external diameter of the injector  30 . The connector portion  40  protruding from the injector  30  is inserted through the opening portion  64  of the fixing member  60 . Therefore, the fixing member  60  can be easily placed around the outer periphery of the injector  30  as shown in FIG.  4 . At that time, the fixing member  60  is inserted until the contacting portion  63  as the end of the fixing member  60  on the combustion chamber  15  side contacts the flange  32  of the injector  30 . 
   The connector portion  40  of the injector  30  is connected to the connector portion  70  of the fixing member  60  when the fixing member  60  is mounted. As shown in  FIG. 3 , the terminal  41  protruding from the connector portion  40  to the side opposite from the combustion chamber  15  is inserted into the socket terminal  75  of the connector portion  70 . More specifically, by moving the fixing member  60  in the axial direction, the terminal  41  and the socket terminal  75  are fitted and electrically connected with each other. Thus, the first socket  71  of the fixing member  60  disposed outside the cylinder head  12  is electrically connected with the coil of the injector  30 . 
   The end of the fixing member  60  on the side opposite from the combustion chamber  15  is connected with the pipe member  50  after the fixing member  60  is mounted as shown in  FIG. 2 . At that time, the spring  53  is interposed between the pipe member  50  and the fixing member  60 . The fixing member  60  is held between the pipe member  50  and the cylinder head  12  by connecting the fixing member  60  with the pipe member  50 . Thus, the axial movement of the fixing member  60  is limited. At that time, a load applied from the pipe member  50  to the fixing member  60  presses the injector  30 , which contacts the contacting portion  63  of the fixing member  60 , against the cylinder head  12 . Thus, the injector  30  is fixed between the fixing member  60  and the cylinder head  12 . 
   By regulating the load caused between the pipe member  50  and the fixing member  60 , the force pressing the injector  30  against the cylinder head  12  can be regulated. The force of the pipe member  50  for pressing the injector  30  can counter a force applied to the injector  30  by a pressure of the combustion gas in the combustion chamber  15 . A structure for pressing the injector  30  against the cylinder head  12  with the use of a pressing force of the spring  53  may be employed. 
   A wiring portion extending from the power source is connected to the first socket  71  after the fixing member  60  is interposed between the pipe member  50  and the cylinder head  12 . Thus, the power source is electrically connected with the coil of the injector  30 . 
   As explained above, in the first embodiment, the injector  30  is fixed between the fixing member  60  and the cylinder head  12  by inserting the fixing member  60  into the hole  20  of the cylinder head  12  in the axial direction. The fixing member  60  is held between the pipe member  50 , which supplies the fuel, and the cylinder head  12 . Accordingly, the injector  30  is held and fixed between the fixing member  60  and the cylinder head  12 . Therefore, the injector  30  can be easily fixed to the cylinder head  12  by regulating total length of the fixing member  60  in the axial direction even in the case where the hole  20  of the cylinder head  12  is deep. 
   In the first embodiment, the connector portion  40  of the injector  30  is connected with the connector portion  70  of the fixing member  60  by moving the fixing member  60  in the axial direction. The connector portion  70  of the fixing member  60  is inserted into the hole  20  of the cylinder head  12  together with the fixing member  60 . Therefore, the connector portion  70  of the fixing member  60  can be easily connected to the connector portion  40  of the injector  30  even in the case where the hole  20  of the cylinder head  12  is deep. The first socket  71  of the connector portion  70  on the side opposite from the injector  30  is disposed outside the cylinder head  12 . Therefore, the injector  30  can be easily connected with the power source even in the case where the injector  30  is inserted deeply into the hole  20  of the cylinder head  12 . 
   The connector portion  40  of the injector  30  and the connector portion  70  of the fixing member  60  are connected with each other by fitting the connector portion  40  with the connector portion  70  in the axial direction. Therefore, protrusion of the connector portion  40  and the connector portion  70  in the radial direction can be inhibited. Thus, there is no need to form a large-diameter hole in the cylinder head  12 . As a result, the volume necessary for installing the injector  30  can be reduced. 
   The terminal  74  and the socket terminal  75  of the connector portion  70  are disposed separately from each other in the axial direction. Accordingly, the connector portion  70  extends in the axial direction. Thus, the enlargement of the connector portion  70  in the radial direction can be inhibited. Therefore, the connector portion  70  and the connector portion  40  connected with the connector portion  70  do not enlarge in the radial direction. As a result, a volume for installing the connector portion  40  and the connector portion  70  can be reduced. 
   In the first embodiment, the coil of the injector  30  is connected with the power source through the connector portion  70  of the fixing member  60 . Therefore, the connector portion  40  of the injector  30  may be formed in a simple shape. Thus, the shape of the connector portion  40  protruding radially outward from the injector  30  can be simplified and the size of the connector portion  40  can be reduced. As a result, the connector portion  40  of the injector  30  and the second socket  72  of the fixing member  60  connected to the connector portion  40  are easily inserted into the enlarged portion  26 , which is slightly enlarged radially outward from the large diameter portion  21 . Therefore, the volume necessary for installing the injector  30  formed with the connector portion  40  can be reduced. Since the volume necessary for installing the injector  30  is reduced, the injector  30  can be easily installed even if the equipments are densely arranged around the engine  10  and a sufficient space cannot be ensured around the engine  10 . 
   In the first embodiment, the connector portion  70  of the fixing member  60  is connected with the connector portion  40  of the injector  30  in the axial direction. The fixing member  60  is held between the pipe member  50  and the cylinder head  12 . Therefore, the load is continuously applied to the fixing member  60  along the direction toward the cylinder head  12 . Accordingly, the connector portion  70  of the fixing member  60  is continuously pressed against the connector portion  40  of the injector  30 . As a result, the terminal  41  of the connector portion  40  does not come off the socket terminal  75  of the connector portion  70 . Therefore, a structure for preventing the terminal  41  from coming off the socket terminal  75  is unnecessary. As a result, the structure can be simplified. 
   (Second Embodiment) 
   Next, a fixing member  60  according to a second embodiment of the present invention for mounting the injector  30  will be explained based on  FIGS. 6A and 6B . 
   The fixing member  60  of the second embodiment shown in  FIG. 6A  is formed with ribs  66  and grooves  67  on an outer wall of a small diameter portion  65  of the fixing member  60 . Thus, a contacting area between a resin molding, which forms a body portion  73  of a connector portion  70  shown in  FIG. 6B , and the small diameter portion  65  of the fixing member  60  is enlarged. Accordingly, connection of the body portion  73  of the connector portion  70  to the small diameter portion  65  can be improved. As a result, the connector portion  70  can be firmly mounted to the fixing member  60 . 
   (Third Embodiment) 
   Next, a fixing member  60  according to a third embodiment of the present invention will be explained based on  FIGS. 7A  and  7 B. 
   A connector portion  70  of the third embodiment is formed beforehand separately from the fixing member  60  as shown in  FIG. 7A . A body portion  73  of the connector portion  70  is formed in a cylindrical shape. A small diameter portion  65  of the fixing member  60  is inserted into the body portion  73  of the connector portion  70 . Then, a ring member  78  as a holding member is press-fitted or fitted to a groove  68  formed on the fixing member  60  for preventing the connector portion  70  from coming off the fixing member  60 . The groove  68  is formed circumferentially on an outer wall of the fixing member  60  and is caved radially inward. Movement of the connector portion  70  toward the combustion chamber  15  is limited by fitting the ring member  78  to the groove  68 . The movement of the connector portion  70  toward the side opposite from the combustion chamber  15  is limited by a step  69  provided between the small diameter portion  65  and a cylinder portion  62  of the fixing member  60 , because the connector portion  70  is mounted around the small diameter portion  65  of the fixing member  60 . Thus, the fixing member  60  and the connector portion  70 , which are formed separately, can be mounted integrally. 
   (Fourth Embodiment) 
   Next, a fixing member  60  according to a fourth embodiment of the present invention will be explained based on  FIG. 8 . 
   In the fourth embodiment, the fixing member  60  and a connector portion  70  are formed by a resin in a single piece as shown in  FIG. 8 . The connector portion  70  and the fixing member  60  are formed by the resin in the single piece while a terminal  74 , a socket terminal  75  and a wiring member  76  of the connector portion  70  are inserted into the connector portion  70 . Thus, the structure is simplified and the number of parts can be reduced. 
   (Fifth Embodiment) 
   Next, a mounting structure and a fixing member for mounting an injector  30  according to a fifth embodiment of the present invention will be explained based on  FIG. 9 . 
   As shown in  FIG. 9 , a pipe member  80  of the fifth embodiment doubles as a fixing member. More specifically, the pipe member  80  is formed integrally with a cylinder portion  81  as a fixing member, and the cylinder portion  81  axially extends toward the combustion chamber  15 . Thus, the pipe member  80  provides a fuel passage  82  inside for supplying the fuel, and an end of the pipe member  80  on the combustion chamber  15  side provides a contacting portion  83 , which contacts a flange  32  of the injector  30 . The pipe member  80  is formed with an opening portion  84 , through which a connector portion  40  of the injector  30  is inserted. The pipe member  80  includes a connector portion  70  connected with a connector portion  40  of the injector  30 . The structure of the connector portion  70  is the same as that of the first embodiment. 
   In the fifth embodiment, the injector  30  is held between the pipe member  80 , which is integrated with the cylinder portion  81 , and the cylinder head  12 . Thus, the injector  30  can be easily mounted and an increase of the number of parts can be inhibited even in the case where the injector  30  is mounted in a deep hole  20  of the cylinder head  12 . Meanwhile, the structure can be further simplified. 
   (Modifications) 
   In the above embodiments, the terminal  41  protruding from the connector portion  40  of the injector  30  toward the side opposite from the combustion chamber  15  is inserted into the socket terminal  75  disposed in the connector portion  70  of the fixing member  60  or the pipe member  80 . Alternatively, a terminal  91  may protrude from a connector portion  90  of the fixing member  60  toward the combustion chamber  15  side and a socket terminal  43  may be formed in the connector portion  40  of the injector  30  as shown in  FIG. 10 . In this case, the terminal  91  protruding from the fixing member  60  is inserted into the socket terminal  43  of the injector  30  by moving the fixing member  60  in the axial direction. 
   In the above embodiments, the present invention is applied to the gasoline engine. Alternatively, the present invention may be applied to other engines such as a diesel engine. In the above embodiments, the present invention is applied to the direct injection type gasoline engine, in which the injector is disposed at the center of the combustion chamber. Alternatively, the present invention may be applied to a direct injection type gasoline engine, in which an injector is mounted on a side of a cylinder, or a pre-mixing type gasoline engine, which injects the fuel into an intake pipe. 
   In the above embodiments, a single fixing member is used. Alternatively, the fixing member may be divided into multiple parts with respect to the axial direction, for instance. 
   The present invention should not be limited to the disclosed embodiments, but may be implemented in many other ways without departing from the spirit of the invention.