Patent Publication Number: US-2020278037-A1

Title: Pressure control device

Description:
The present invention claims priority under 35 U.S.C. § 119 to Japanese Application No. 2019-035167 filed on Feb. 28, 2019 the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to a pressure control device. 
     Description of Related Art 
     Regarding an oil pressure control device for controlling an oil pressure, for example, an oil pressure control device mounted on an automobile for the clutch is known. 
     Further, in general, in an oil pressure control device, when a filter is inserted into a flow path of a body and these members are assembled together to manufacture the oil pressure control device, the assembly work is often performed manually, for example. 
     It should be noted that the introduction in Background is merely provided for the convenience of clearly and comprehensively describing the technical solutions of the disclosure and facilitating the understanding of those skilled in the art. These technical solutions shall not be deemed well-known by those skilled in the art simply for having been described in Background. 
     However, the thinner the flow path is (that is, the smaller the width of the flow path is), the more difficult it is to perform the insertion work of the filter into the flow path. Therefore, there has been a problem that the efficiency of assembly work of the body and the filter is low. 
     SUMMARY 
     In one embodiment of the disclosure, a pressure control device of the disclosure includes: a body which has a groove-shaped flow path including a groove part and a widened part connected to the groove part and having a width larger than a width of the groove part; and a filter unit which is accommodated in the widened part to intercept the groove-shaped flow path and which captures foreign matters mixed in a fluid passing through the groove-shaped flow path, wherein the filter unit includes: a filter member which is in a cylindrical shape whose central axis is along a depth direction of the widened part; and a cap which is attached to the filter member on one end side in a direction of the central axis and which has a defining part that defines a disposition position of the filter member with respect to the groove part in a circumferential direction. 
     The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing an embodiment of a pressure control device of the disclosure. 
         FIG. 2  is an exploded perspective view of the pressure control device shown in  FIG. 1 . 
         FIG. 3  is a cross-sectional view taken along the line in  FIG. 1 . 
         FIG. 4  is a view of the pressure control device shown in  FIG. 1  as viewed from the front side. 
         FIG. 5  is a perspective view showing a part of the pressure control device shown in  FIG. 1 . 
         FIG. 6  is an exploded perspective view of a part of the pressure control device shown in  FIG. 5 . 
         FIG. 7  is a cross-sectional view taken along the line VII-VII in  FIG. 5 . 
         FIG. 8  is a transverse sectional view of a part of the pressure control device shown in  FIG. 5 . 
         FIG. 9  is a transverse sectional view of a part of the pressure control device shown in  FIG. 5 . 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The foregoing and other features of the disclosure will become apparent from the following specification with reference to the accompanying drawings. Specific embodiments of the disclosure are disclosed in the specification and the accompanying drawings. The specification and the accompanying drawings describe several embodiments to which the principles of the disclosure are applicable. However, it should be understood that, the disclosure is not limited to the embodiments described herein, but shall include all modifications, variations and equivalents falling within the scope of the appended claims. 
     Hereinafter, a pressure control device of the disclosure will be described in detail based on preferred embodiments shown in the accompanying drawings. 
     In each drawing, the Z-axis direction is the vertical direction Z. The X-axis direction is the left-right direction X in the horizontal direction orthogonal to the vertical direction Z. The Y-axis direction is the axial direction Y orthogonal to the left-right direction X in the horizontal direction orthogonal to the vertical direction Z. The positive side in the vertical direction Z is referred to as “the upper side,” and the negative side is referred to as “the lower side.” The positive side in the axial direction Y is referred to as “the front side,” and the negative side is referred to as “the rear side.” The front side corresponds to the one side in the axial direction, and the rear side corresponds to the other side in the axial direction. In the embodiment, the depth direction of a groove part is the vertical direction, and this is the Z-axis direction. Moreover, the width direction of the groove part orthogonal to the Z-axis direction is the X-axis direction. Further, the length direction (longitudinal direction) of the groove part (that is, a flow direction of a fluid) orthogonal to the Z-axis direction and the X-axis direction, respectively, is the Y-axis direction. Further, the upper side, the lower side, the front side, the rear side, the vertical direction, and the left-right direction are simply names for describing the relative positional relationship of each part, and the actual dispositional relationship and the like may be a dispositional relationship and the like other than the dispositional relationship and the like indicated by these names. Further, a “plan view” refers to a state viewed from the upper side toward the lower side. 
     Hereinafter, an embodiment of the pressure control device of the disclosure will be described with reference to  FIGS. 1 to 9 . 
     A pressure control device  10  of the embodiment shown in  FIGS. 1 and 2  is, for example, a control valve mounted on a vehicle. The pressure control device  10  includes an oil passage body  20 , a spool valve  30 , a magnet holder  80 , a magnet  50 , an elastic member  70 , a fixing member  71 , and a sensor module  40 . 
     As shown in  FIG. 3 , the oil passage body  20  includes therein an oil passage  10   a  through which oil flows. The part of the oil passage  10   a  indicated in  FIG. 3  is a part of a spool hole  23  (to be described later). Each drawing shows a state in which a part of the oil passage body  20  is cut out, for example. As shown in  FIG. 1 , the oil passage body  20  includes a lower body  21  and an upper body  22 . Though omitted in the drawings, for example, the oil passage  10   a  is provided in both the lower body  21  and the upper body  22 . 
     The lower body  21  includes a lower body main body  21   a  and a separate plate  21   b  disposed to overlap the upper side of the lower body main body  21   a . In the embodiment, the upper surface of the lower body  21  corresponds to the upper surface of the separate plate  21   b  and is orthogonal to the vertical direction Z. The upper body  22  is disposed to overlap the upper side of the lower body  21 . The lower surface of the upper body  22  is orthogonal to the vertical direction Z. The lower surface of the upper body  22  contacts the upper surface of the lower body  21 , that is, the upper surface of the separate plate  21   b.    
     As shown in  FIG. 3 , the upper body  22  includes the spool hole  23  extending in the axial direction Y. In the embodiment, the cross-sectional shape of the spool hole  23  orthogonal to the axial direction Y is a circular shape with a central axis J as the center. The central axis J extends in the axial direction Y. Further, a radial direction with the central axis J as the center is simply referred to as “the radial direction,” and a circumferential direction with the central axis J as the center is simply referred to as “the circumferential direction.” 
     The spool hole  23  opens at least on the front side. In the embodiment, the rear end of the spool hole  23  is closed. That is, the spool hole  23  is a hole that opens on the front side and has a bottom part. Further, the spool hole  23  may open on both sides in the axial direction Y, for example. At least a part of the spool hole  23  forms a part of the oil passage  10   a  in the oil passage body  20 . 
     The spool hole  23  includes a spool hole main body  23   a  and a guiding hole part  23   b . Though omitted in the drawings, the oil passage  10   a  provided in a part other than the spool hole  23  in the oil passage body  20  opens on the inner circumferential surface of the spool hole main body  23   a . The inner diameter of the guiding hole part  23   b  is larger than the inner diameter of the spool hole main body  23   a . The guiding hole part  23   b  is connected to the front-side end part of the spool hole main body  23   a . The guiding hole part  23   b  is the front-side end part of the spool hole  23  and opens on the front side. 
     As shown in  FIG. 1 , the spool hole  23  includes a groove part  24  that is recessed from the inner circumferential surface of the spool hole  23  toward the outer side in the radial direction and extends in the axial direction Y. In the embodiment, a pair of groove parts  24  are provided across the central axis J. The pair of groove parts  24  are recessed from the inner circumferential surface of the guiding hole part  23   b  toward both sides in the left-right direction X. The groove part  24  is provided from the front-side end part on the inner circumferential surface of the guiding hole part  23   b  to the rear-side end part on the inner circumferential surface of the guiding hole part  23   b . As shown in  FIG. 4 , an inner side surface  24   a  of the groove part  24  is in a semicircular arc shape that is concave from the inner circumferential surface of the guiding hole part  23   b  toward the outer side in the radial direction when viewed from the front side. 
     As shown in  FIG. 3 , the upper body  22  includes through holes  22   a ,  22   b ,  22   c  at the front-side end part of the upper body  22 . The through hole  22   a  penetrates a part in the upper body  22  from the upper surface of the upper body  22  to the inner circumferential surface of the guiding hole part  23   b  in the vertical direction Z. The through hole  22   b  penetrates a part in the upper body  22  from the lower surface of the upper body  22  to the inner circumferential surface of the guiding hole part  23   b  in the vertical direction Z. As shown in  FIG. 1 , the through hole  22   a  and the through hole  22   b  are in a rectangular shape that is long in the left-right direction X when viewed from the upper side. The through hole  22   a  and the through hole  22   b  overlap each other when viewed from the upper side. 
     As shown in  FIG. 3 , the through hole  22   c  penetrates a part in the upper body  22  from the front surface of the upper body  22  to the through hole  22   b  in the axial direction Y. The through hole  22   c  is provided at the lower end part of the front surface of the upper body  22 . The through hole  22   c  opens on the lower side. As shown in  FIG. 4 , the through hole  22   c  is in a rectangular shape that is long in the left-right direction X when viewed from the front side. The centers of the through holes  22   a ,  22   b ,  22   c  in the left-right direction X are, for example, the same as the position of the central axis J in the left-right direction X. 
     As shown in  FIG. 1 , the part of the upper body  22  where the spool hole  23  is provided protrudes further to the upper side than the other part of the upper body  22 . The upper surface at the front-side end part of this protruding part is a curved surface in a semicircular arc shape convex toward the upper side. The through hole  22   a  opens at the upper end part of the curved surface in a semicircular arc shape. The lower body main body  21   a , the separate plate  21   b , and the upper body  22  are each a single member, for example. The lower body main body  21   a , the separate plate  21   b , and the upper body  22  are made of a nonmagnetic material. 
     As shown in  FIG. 3 , the spool valve  30  is disposed along the central axis J extending in the axial direction Y that intersects the vertical direction Z. The spool valve  30  is in a circular columnar shape. The spool valve  30  is attached to the oil passage body  20 . The spool valve  30  is disposed to be movable in the axial direction Y within the spool hole  23 . 
     The spool valve  30  moves in the axial direction Y within the spool hole main body  23   a , and opens and closes the opening part of the oil passage  10   a  that opens on the inner circumferential surface of the spool hole main body  23   a . Though omitted in the drawings, a forward force from oil pressure of the oil or a driving device such as a solenoid actuator is applied to the rear-side end part of the spool valve  30 . The spool valve  30  includes a supporting part  31   a , a plurality of large diameter parts  31   b , and a plurality of small diameter parts  31   c . Each part of the spool valve  30  is in a circular columnar shape extending in the axial direction Y with the central axis J as the center. 
     The supporting part  31   a  is the front-side end part of the spool valve  30 . The front-side end part of the supporting part  31   a  supports the rear-side end part of the magnet holder  80 . The rear-side end part of the supporting part  31   a  is connected to the front-side end part of the large diameter part  31   b.    
     The plurality of large diameter parts  31   b  and the plurality of small diameter parts  31   c  are alternately and continuously disposed from the large diameter part  31   b  connected to the rear-side end part of the supporting part  31   a  toward the rear side. The outer diameter of the large diameter part  31   b  is larger than the outer diameter of the small diameter part  31   c . In the embodiment, the outer diameter of the supporting part  31   a  and the outer diameter of the small diameter part  31   c  are, for example, equal. The outer diameter of the large diameter part  31   b  is substantially equal to the inner diameter of the spool hole main body  23   a , and is slightly smaller than the inner diameter of the spool hole main body  23   a . The large diameter part  31   b  is movable in the axial direction Y while sliding with respect to the inner circumferential surface of the spool hole main body  23   a . The large diameter part  31   b  functions as a valve part that opens and closes the opening part of the oil passage  10   a  that opens on the inner circumferential surface of the spool hole main body  23   a . In the embodiment, the spool valve  30  is, for example, a single member made of metal. 
     The magnet holder  80  is disposed on the front side of the spool valve  30 . The magnet holder  80  is disposed inside the guiding hole part  23   b  to be movable in the axial direction Y. The spool valve  30  and the magnet holder  80  are allowed to rotate relative to each other around the central axis. As shown in  FIG. 2 , the magnet holder  80  includes a holder main body part  81  and a facing part  82 . 
     The holder main body part  81  is in a stepped circular columnar shape extending in the axial direction Y with the central axis J as the center. As shown in  FIG. 3 , the holder main body part  81  is disposed in the spool hole  23 . More specifically, the holder main body part  81  is disposed in the guiding hole part  23   b . The holder main body part  81  includes a sliding part  81   a  and a supported part  81   b . That is, the magnet holder  80  includes the sliding part  81   a  and the supported part  81   b.    
     The outer diameter of the sliding part  81   a  is larger than the outer diameter of the large diameter part  31   b . The outer diameter of the sliding part  81   a  is substantially equal to the inner diameter of the guiding hole part  23   b , and is slightly smaller than the inner diameter of the guiding hole part  23   b . The sliding part  81   a  is movable in the axial direction Y while sliding with respect to the inner circumferential surface of the spool hole  23 , that is, the inner circumferential surface of the guiding hole part  23   b  in the embodiment. The outer edge part in the radial direction of the rear-side surface of the sliding part  81   a  can contact a front-side-facing step surface of a step formed between the spool hole main body  23   a  and the guiding hole part  23   b . In this way, the magnet holder  80  can be suppressed from moving from the position where the magnet holder  80  contacts the step surface toward the rear side, and the furthest rear end position of the magnet holder  80  can be determined. As will be described later, since the spool valve  30  receives a backward force from the elastic member  70  via the magnet holder  80 , the furthest rear end position of the spool valve  30  can be determined by determining the furthest rear end position of the magnet holder  80 . 
     The supported part  81   b  is connected to the rear-side end part of the sliding part  81   a . The outer diameter of the supported part  81   b  is smaller than the outer diameter of the sliding part  81   a  and the outer diameter of the large diameter part  31   b , and larger than the outer diameter of the supporting part  31   a  and the outer diameter of the small diameter part  31   c . The supported part  81   b  is movable in the spool hole main body  23   a . The supported part  81   b  moves in the axial direction Y between the guiding hole part  23   b  and the spool hole main body  23   a  as the spool valve  30  moves in the axial direction Y. 
     The supported part  81   b  includes a supported concave part  80   b  that is recessed from the rear-side end part of the supported part  81   b  toward the front side. The supporting part  31   a  is inserted into the supported concave part  80   b . The front-side end part of the supporting part  31   a  contacts the bottom surface of the supported concave part  80   b . In this way, the magnet holder  80  is supported by the spool valve  30  from the rear side. The size of the supported part  81   b  in the axial direction Y is smaller than the size of the sliding part  81   a  in the axial direction Y, for example. 
     As shown in  FIG. 2 , the facing part  82  protrudes from the holder main body part  81  toward the outer side in the radial direction. More specifically, the facing part  82  protrudes from the sliding part  81   a  toward the outer side in the radial direction. In the embodiment, a pair of facing parts  82  are provided across the central axis J. The pair of facing parts  82  protrude from the outer circumferential surface of the sliding part  81   a  toward both sides in the left-right direction X. The facing part  82  extends in the axial direction Y from the front-side end part of the sliding part  81   a  to the rear-side end part of the sliding part  81   a . As shown in  FIG. 4 , the facing part  82  is in a semicircular arc shape that is convex toward the outer side in the radial direction when viewed from the front side. 
     The pair of facing parts  82  are fitted in the pair of groove parts  24 . The facing part  82  faces the inner side surface  24   a  of the groove part  24  in the circumferential direction and can contact the inner side surface  24   a . In addition, in the specification, that “two certain parts face each other in the circumferential direction” includes that both of the two parts are located on one virtual circle along the circumferential direction and that the two parts face each other. 
     As shown in  FIG. 3 , the magnet holder  80  includes a first concave part  81   c  that is recessed from the outer circumferential surface of the sliding part  81   a  toward the inner side in the radial direction. In  FIG. 3 , the first concave part  81   c  is recessed from the upper end part of the sliding part  81   a  toward the lower side. The inner side surfaces of the first concave part  81   c  include a pair of surfaces facing the axial direction Y. 
     The magnet holder  80  includes a second concave part  80   a  that is recessed from the front-side end part of the magnet holder  80  toward the rear side. The second concave part  80   a  extends from the sliding part  81   a  to the supported part  81   b . As shown in  FIG. 2 , the second concave part  80   a  is in a circular shape with the central axis J as the center when viewed from the front side. As shown in  FIG. 3 , the inner diameter of the second concave part  80   a  is larger than the inner diameter of the supported concave part  80   b.    
     For example, the magnet holder  80  may be made of resin or made of metal. In the case where the magnet holder  80  is made of resin, the magnet holder  80  can be easily manufactured. Moreover, the manufacturing cost of the magnet holder  80  can be reduced. In the case where the magnet holder  80  is made of metal, the size accuracy of the magnet holder  80  can be improved. 
     As shown in  FIG. 2 , the magnet  50  is in a substantially rectangular parallelepiped shape. The upper surface of the magnet  50  is, for example, a surface that is curved in an arc shape along the circumferential direction. As shown in  FIG. 3 , the magnet  50  is accommodated in the first concave part  81   c  and fixed to the holder main body part  81 . In this way, the magnet  50  is fixed to the magnet holder  80 . The magnet  50  is fixed by, for example, an adhesive. The outer side surface in the radial direction of the magnet  50  is located, for example, closer to the inner side in the radial direction than the outer circumferential surface of the sliding part  81   a . The outer side surface in the radial direction of the magnet  50  faces the inner circumferential surface of the guiding hole part  23   b  in the radial direction with a gap therebetween. 
     As described above, the sliding part  81   a  provided with the first concave part  81   c  moves while sliding with respect to the inner circumferential surface of the spool hole  23 . Therefore, the outer circumferential surface of the sliding part  81   a  and the inner circumferential surface of the spool hole  23  contact each other or face each other with a slight gap therebetween. As a result, it is difficult for foreign matters such as metal pieces contained in the oil to enter the first concave part  81   c . Therefore, foreign matters such as metal pieces contained in the oil can be suppressed from attaching to the magnet  50  accommodated in the first concave part  81   c . In the case where the magnet holder  80  is made of metal, since the size accuracy of the sliding part  81   a  can be improved, it is more difficult for the foreign matters such as metal pieces contained in the oil to enter the first concave part  81   c.    
     As shown in  FIG. 2 , the fixing member  71  is in a plate shape whose plate surfaces are parallel to the left-right direction X. The fixing member  71  includes an extending part  71   a  and a bent part  71   b . The extending part  71   a  extends in the vertical direction Z. The extending part  71   a  is in a rectangular shape that is long in the vertical direction Z when viewed from the front side. As shown in  FIGS. 1 and 3 , the extending part  71   a  is inserted into the guiding hole part  23   b  through the through hole  22   b . The upper end part of the extending part  71   a  is inserted into the through hole  22   a . The extending part  71   a  closes a part of the opening of the guiding hole part  23   b  on the front side. The bent part  71   b  is bent from the lower-side end part of the extending part  71   a  toward the front side. The bent part  71   b  is inserted into the through hole  22   c . The fixing member  71  is disposed on the front side of the elastic member  70 . 
     In the embodiment, the fixing member  71  is inserted to the through hole  22   a  from the opening part of the through hole  22   b , which opens on the lower surface of the upper body  22 , through the through hole  22   b  and the guiding hole part  23   b  before the upper body  22  and the lower body  21  are overlapped. Then, as shown in  FIG. 1 , the upper body  22  and the lower body  21  are stacked and combined in the vertical direction Z, whereby the bent part  71   b  inserted in the through hole  22   c  can be supported by the upper surface of the lower body  21  from the lower side. In this way, the fixing member  71  can be attached to the oil passage body  20 . 
     As shown in  FIG. 3 , the elastic member  70  is a coil spring extending in the axial direction Y. The elastic member  70  is disposed on the front side of the magnet holder  80 . In the embodiment, at least a part of the elastic member  70  is disposed in the second concave part  80   a . Therefore, at least a part of the elastic member  70  can be overlapped with the magnet holder  80  in the radial direction, and the size of the pressure control device  10  in the axial direction Y can be easily reduced. In the embodiment, the rear-side part of the elastic member  70  is disposed in the second concave part  80   a.    
     The rear-side end part of the elastic member  70  contacts the bottom surface of the second concave part  80   a . The front-side end part of the elastic member  70  contacts the fixing member  71 . In this way, the front-side end part of the elastic member  70  is supported by the fixing member  71 . The fixing member  71  receives a forward elastic force from the elastic member  70 , and the extending part  71   a  is pressed against the front-side inner side surfaces of the through holes  22   a ,  22   b.    
     By supporting the front-side end part of the elastic member  70  by the fixing member  71 , the elastic member  70  applies a backward elastic force to the spool valve  30  via the magnet holder  80 . Therefore, for example, the position of the spool valve  30  in the axial direction Y can be maintained at a position where the oil pressure of the oil or the force from a driving device such as a solenoid actuator applied to rear-side end part of the spool valve  30  and the elastic force of the elastic member  70  are balanced. In this way, the position of the spool valve  30  in the axial direction Y can be changed by changing the force applied to the rear-side end part of the spool valve  30 , and the oil passage  10   a  inside the oil passage body  20  can be switched between opening and closing. 
     Further, the magnet holder  80  and the spool valve  30  can be pressed against each other in the axial direction Y by the oil pressure of the oil or the force from a driving device such as a solenoid actuator applied to rear-side end part of the spool valve  30  and the elastic force of the elastic member  70 . Therefore, the magnet holder  80  moves in the axial direction Y as the spool valve  30  moves in the axial direction Y while relative rotation around the central axis with respect to the spool valve  30  is allowed. 
     The sensor module  40  includes a housing  42  and a magnetic sensor  41 . The housing  42  accommodates the magnetic sensor  41 . As shown in  FIG. 1 , the housing  42  is, for example, in a rectangular parallelepiped box shape flat in the vertical direction Z. The housing  42  is fixed to a flat surface located on the rear side of the curved surface in a semicircular arc shape, where the through hole  22   a  is provided, on the upper surface of the upper body  22 . 
     As shown in  FIG. 3 , the magnetic sensor  41  is fixed to the bottom surface of the housing  42  inside the housing  42 . In this way, the magnetic sensor  41  is attached to the oil passage body  20  via the housing  42 . The magnetic sensor  41  detects the magnetic field of the magnet  50 . The magnetic sensor  41  is, for example, a Hall element. Further, the magnetic sensor  41  may be a magnetoresistive element. 
     When the position of the magnet  50  in the axial direction Y changes as the spool valve  30  moves in the axial direction Y, the magnetic field of the magnet  50  passing through the magnetic sensor  41  changes. Therefore, by detecting the change in the magnetic field of the magnet  50  by the magnetic sensor  41 , the position of the magnet  50  in the axial direction Y (that is, the position of the magnet holder  80  in the axial direction Y) can be detected. As described above, the magnet holder  80  moves in the axial direction Y as the spool valve  30  moves in the axial direction Y. Therefore, the position of the spool valve  30  in the axial direction Y can be detected by detecting the position of the magnet holder  80  in the axial direction Y. 
     The magnetic sensor  41  and the magnet  50  overlap in the vertical direction Z. That is, at least a part of the magnet  50  overlaps the magnetic sensor  41  in a direction parallel to the vertical direction Z in the radial direction. Therefore, the magnetic sensor  41  can easily detect the magnetic field of the magnet  50 . As a result, the sensor module  40  can detect the position change of the magnet holder  80  in the axial direction Y (that is, the position change of the spool valve  30  in the axial direction Y) with higher accuracy. 
     In addition, in the specification, that “at least a part of the magnet overlaps the magnetic sensor in the radial direction” means that at least a part of the magnet may overlap the magnetic sensor in the radial direction in at least some positions within the range in which the spool valve to which the magnet is directly fixed moves in the axial direction. That is, for example, when the spool valve  30  and the magnet holder  80  change the positions in the axial direction Y from the positions of  FIG. 3 , the magnet  50  may not overlap the magnetic sensor  41  in the vertical direction Z. In the embodiment, a part of the magnet  50  overlaps the magnetic sensor  41  in the vertical direction Z at any position as long as the spool valve  30  is within the range in which the spool valve  30  moves in the axial direction Y. 
     The pressure control device  10  further includes a rotation stopping part. The rotation stopping part is a part that can contact the magnet holder  80 . In the embodiment, the rotation stopping part is the inner side surface  24   a  of the groove part  24 . That is, the facing part  82  faces the inner side surface  24   a , which is the rotation stopping part, in the circumferential direction and can contact the inner side surface  24   a.    
     Therefore, according to the embodiment, for example, when the facing part  82  tries to rotate around the central axis J, the facing part  82  contacts the inner side surface  24   a , which is the rotation stopping part. As a result, rotation of the facing part  82  is suppressed by the inner side surface  24   a , and rotation of the magnet holder  80  around the central axis J is suppressed. As a result, the position of the magnet  50  fixed to the magnet holder  80  can be suppressed from shifting in the circumferential direction. Therefore, even when the spool valve  30  rotates around the central axis J when the position of the spool valve  30  in the axial direction Y does not change, the information of the position of the magnet  50  in the axial direction Y detected by the magnetic sensor  41  can be suppressed from changing. In this way, the information of the position of the spool valve  30  can be suppressed from changing, and the accuracy of grasping the position of the spool valve  30  in the axial direction Y can be improved. 
     Further, according to the embodiment, the rotation stopping part is the inner side surface  24   a  of the groove part  24 . Therefore, it is not necessary to prepare a separate member as the rotation stopping part, and the number of components of the pressure control device  10  can be reduced. In this way, the effort required for the assembly of the pressure control device  10  and the manufacturing cost of the pressure control device  10  can be reduced. 
     As described above, the oil passing through the pressure control device  10  may contain foreign matters such as metal pieces. It is preferable that such foreign matters are captured in the course of the oil passing through the pressure control device  10  and are prevented from flowing further to the downstream side. Therefore, the pressure control device  10  is configured to be capable of capturing foreign matters. Hereinafter, this configuration and operation will be described with reference to  FIGS. 5 to 9 . 
     In addition, though the pressure control device  10  is applied to an oil pressure control device which controls the pressure of oil in the embodiment, it is not limited thereto. Examples of devices to which the pressure control device  10  can be applied include fluid devices such as a water pressure control device that controls the pressure of water and an air pressure control device that controls the pressure of air in addition to an oil pressure control device. In this case, things that pass through the pressure control device  10  include fluids such as oil, water, and air, and these are collectively referred to as a “fluid” in the following description. Further, the direction in which the fluid flows is referred to as a “flow direction Q.” 
     In addition to the spool valve  30 , the magnet holder  80 , the magnet  50 , the elastic member  70 , the fixing member  71 , the sensor module  40  and the like described above, the pressure control device  10  further includes a filter unit  9  attached to a body  3  as shown in  FIG. 5 . 
     The body  3  may be at least one of the lower body  21  and the upper body  22  that form the oil passage body  20 . As shown in  FIGS. 5 to 7 , the body  3  includes a groove-shaped flow path  33  which is provided in a recessed manner on an upper surface (surface)  36  and through which the fluid passes. The groove-shaped flow path  33  includes a groove part  31  and a widened part  32  connected to the groove part  31 , and the groove-shaped flow path  33  forms a part of the oil passage  10   a.    
     The groove part  31  includes a bottom part (first bottom part)  311  and, when viewed from upstream to downstream of the flow of the fluid, a side wall part  312  located on one side of the bottom part  311  and a side wall part  313  located on the other side of the bottom part  311 . In addition, it is preferable that a boundary part  314  between the bottom part  311  and the side wall part  312  and a boundary part  315  between the bottom part  311  and the side wall part  313  are rounded as shown in  FIG. 5 . In this way, the fluid can smoothly pass through the vicinity of the boundary part  314  and the boundary part  315 . 
     The groove part  31  is in a linear shape along the axial direction Y in the plan view of the body  3 , but it is not limited thereto, and the groove part  31  may include at least a part that is curved. A width (first width) W 31  (with reference to  FIG. 6 ) of the groove part  31 , which is the distance between the side wall part  312  and the side wall part  313 , is substantially constant along the axial direction Y. Further, a depth (first depth) D 31  (with reference to  FIG. 7 ) of the groove part  31 , which is the depth from the surface  36  to the bottom part  311 , is also substantially constant along the axial direction Y. 
     The widened part  32  is provided in the longitudinal direction of the groove-shaped flow path  33 , that is, in the middle in the axial direction Y. The widened part  32  extends from the surface  36  to the bottom part  311 , has a width W 32  larger than the width W 31  of the groove part  31 , and functions as an accommodating part in which the filter unit  9  in a cylindrical shape is accommodated. The width W 32  (with reference to  FIG. 6 ) of the widened part  32  gradually increases from the upstream side to the downstream side (that is, from the front side to the rear side), and gradually decreases from the middle toward the downstream side. Specifically, in the embodiment, the widened part  32  includes a curved part  321  that is curved in an arc shape in the plan view. 
     The widened part  32  in such a shape can be processed by an end mill, for example. 
     As shown in  FIG. 7 , the widened part  32  has a depth (second depth) D 32  from the surface  36  to a bottom surface (second bottom part)  341  while maintaining the width W 32  constant along the vertical direction Z, and the depth D 32  is larger than the depth D 31  of the groove part  31 . The widened part  32  includes, on the bottom part thereof, a receiving part  34  which a part of the filter unit  9  (the filter member  93 ) on the lower side enters. In this way, for example, foreign matters mixed in the fluid can be prevented from bypassing the filter unit  9  and flowing to the downstream side. Further, of course, a depth D 34  of the receiving part  34  is equal to the difference between the depth D 32  and the depth D 31 . 
     As shown in  FIGS. 6 and 7 , the filter unit  9  is accommodated in the widened part  32  so that the direction of a central axis O 93  of the filter member  93  is along the direction of the depth D 32  of the widened part  32  (that is, the vertical direction Z). The filter unit  9  can capture the foreign matters mixed in the fluid when the fluid passes through the groove-shaped flow path  33 . In this way, for example, the malfunction of operation of the pressure control device  10  caused by foreign matters can be prevented or suppressed. Examples of the malfunction include inhibition of movement of the spool valve  30  when it moves in the spool hole  23 . 
     As shown in  FIGS. 5 to 7 , the filter unit  9  includes the filter member  93  and a cap  96  attached to the filter member  93 . 
     The filter member  93  is a member in which a plate material is formed in a circular cylindrical shape so that the central axis O 93  is along the direction of the depth D 32  of the widened part  32 . Then, as described above, in the pressure control device  10 , the filter member  93  can be accommodated in the widened part  32  so that the direction of its central axis O 93  is along the direction of the depth D 32  of the widened part  32 . In this way, the filter member  93  is accommodated in the widened part  32  to intercept the groove-shaped flow path  33  and thus can capture the foreign matters mixed in the fluid passing through the groove-shaped flow path  33 . In addition, though the filter member  93  is in a circular cylindrical shape in the embodiment, it is not limited thereto, and it may be, for example, in an angular cylindrical shape or the like. 
     As shown in  FIGS. 6 and 7 , the filter member  93  has a small hole region  932  on one end side in the direction of the axis O 33  of the flow path  33  (that is, on the negative side in the axial direction Y), and has an open part  933  on the other end side in the direction of the axis O 33  of the flow path  33  (that is, on the positive side in the axial direction Y). 
     The small hole region  932  is a region provided with a plurality of small holes  931  penetrating in the thickness (plate thickness) direction of the filter member  93 . The small holes  931  are disposed at intervals along both the circumferential direction of the filter member  93  and the vertical direction Z. The diameter of the small hole  931  is set to be smaller than an average foreign matter diameter, and it is preferable that the total area of the small holes  931  is as large as possible so as not to inhibit the flow of the fluid, and it is also preferable that the opening ratio is as large as possible. With such small holes  931 , the foreign matter capturing property of the filter unit  9  is improved. 
     The open part  933  is a part where the other end side of the filter member  93  in the direction of the axis O 33  of the flow path  33  is open over the entire length in the direction of the central axis O 93 . In this way, the filter member  93  can easily elastically deform in the radial direction. Due to such elastic deformation, as shown in  FIG. 8 , when the filter member  93  is accommodated in the widened part  32 , the filter member  93  can contract toward the inner side in the radial direction to be smaller than the widened part  32 . In this way, the accommodation work of the filter member  93  to the widened part  32  can be performed easily. Further, as shown in  FIG. 9 , the filter member  93  expands toward the outer side in the radial direction by a restoring force when accommodated in the widened part  32 , that is, in the accommodated state of being accommodated in the widened part  32 . In this way, the filter member  93  is moved toward the outer side in the radial direction, and its outer circumferential surface  935  contacts the curved part  321  of the widened part  32 , and its posture within the widened part  32  is stabilized. 
     Therefore, when the body  3  and the filter member  93  are assembled, the filter member  93  can be appropriately elastically deformed until the accommodation of the filter member  93  into the widened part  32  of the body  3  is completed, whereby the assembly workability is improved. 
     Further, as described above, the filter member  93  is in a circular cylindrical shape. In this way, the filter member  93  can stably elastically deform in the radial direction. In addition, a “circular cylinder” has a shape that is durable against the flow of the fluid. In this way, when the fluid passes through the filter member  93 , the filter member  93  is prevented from being deformed by the flow of the fluid, whereby the filter member  93  can reliably capture the foreign matters. As a result, the foreign matter capturing property of the filter unit  9  is further improved. 
     In addition, in the state shown in  FIGS. 5 and 7 , the flow direction Q of the fluid is a flow from the open part  933  side toward the small hole region  932  side of the filter member  93 , that is, a flow toward the negative side in the axial direction Y. However, the flow direction Q is not limited thereto, and it may be a flow from the small hole region  932  side toward the open part  933  side of the filter member  93 , that is, a flow toward the positive side in the axial direction Y. 
     As shown in  FIGS. 5 to 7 , the cap  96  is attached to the filter member  93  on the one end side in the direction of the central axis O 93 , that is, on the positive side in the vertical direction Z. The cap  96  may be attached to the filter member  93  after the filter member  93  is accommodated in the widened part  32 , or the cap  96  may be attached to the filter member  93  before the filter member  93  is accommodated in the widened part  32 . In this case, when the filter member  93  is accommodated in the widened part  32 , the cap  96  can be held, and the accommodation work can be performed easily and smoothly. 
     In addition, for example, it is preferable that the cap  96  is formed by an elastic material such as silicone rubber. 
     As shown in  FIG. 6 , the cap  96  includes a main body part  962  in a circular plate shape and a pair of claw parts  961  provided on the lower side of the main body part  962 . 
     The main body part  962  includes a small diameter part  963  which has a diameter that changes along the vertical direction Z and which is located on the lower side, and includes a large diameter part  964  which is located on the upper side and which has a diameter that is larger than the diameter of the small diameter part  963 . 
     The small diameter part  963  elastically deforms and is fitted inside the filter member  93 . 
     The large diameter part  964  elastically deforms and is fitted inside the widened part  32 . In this way, the filter unit  9  can be prevented from detaching from the widened part  32  when the body  3  and the filter unit  9  (the filter member  93 ) are assembled. Due to this detachment prevention effect, for example, even if the body  3  and the filter unit  9  in the assembly state are turned upside down, or even if vibration is applied during transportation, unintentional disassembly of the body  3  and the filter unit  9  when the filter unit  9  is detached from the widened part  32  can be prevented. 
     Each claw part  961  protrudes from the inner side in the radial direction of the filter member  93  toward the outer side. Further, the claw parts  961  protrude in directions opposite to each other; that is, one claw part  961  protrudes toward the positive side in the left-right direction X, and the other claw part  961  protrudes toward the negative side in the left-right direction X. 
     In addition, the filter member  93  includes two through holes  934 . Each through hole  934  is provided between the small hole region  932  and the open part  933  of the filter member  93 . Each claw part  961  of the cap  96  can enter the through hole  934  from the inner side of the filter member  93  toward the outer side. Then, due to this entry and the fitting of the small diameter part  963  to the filter member  93 , the cap  96  is more securely attached to the filter member  93 . 
     As shown in  FIGS. 5 to 7 , the cap  96  includes a defining part  95  which defines the disposition position of the filter member  93  with respect to the groove part  31  in the circumferential direction and which serves as a detent around the central axis O 93  of the filter member  93  in the state where the filter member  93  is accommodated in the widened part  32 . Here, “defining the disposition position of the filter member  93  with respect to the groove part  31  in the circumferential direction” can mean “defining the direction of the filter member  93  around the central axis O 93 .” 
     The defining part  95  is configured by a pair of protruding parts  951  which are provided on the large diameter part  964  of the cap  96  and which protrude in a block shape or a plate shape. The protruding parts  951  are respectively disposed on the upstream side and the downstream side of the groove-shaped flow path  33 . In other words, one protruding part  951  of the protruding parts  951  is directed from the widened part  32  toward the groove part  31  located on the upstream side, that is, protrudes toward the front side in the axial direction Y, and the other protruding part  951  is directed from the widened part  32  toward the groove part  31  located on the downstream side, that is, protrudes toward the rear side in the axial direction Y. 
     Then, in the state where the filter member  93  is accommodated in the widened part  32 , each protruding part  951  is disposed in the groove part  31 . Further, at this time, each protruding part  951  may abut against at least one of the side wall part  312  and the side wall part  313  of the groove part  31 . With the protruding parts  951  of this kind, the filter member  93  can be prevented from rotating in either the clockwise direction or the counterclockwise direction with the central axis O 93  as the center in the state of being accommodated in the widened part  32 . In this way, even when the pressure control device  10  is in operation, the posture of the filter member  93  in the widened part  32  can be stabilized, and the small hole region  932  of the filter member  93  can face the flow direction Q of the fluid, and the filter member  93  can capture the foreign matters. Further, when the filter member  93  is accommodated in the widened part  32 , the above-described disposition position of the filter member  93  with respect to the groove part  31  can be quickly grasped, whereby the assembly work of the body  3  and the filter unit  9  can be performed smoothly. 
     In addition, the defining part  95  can be configured by the protruding parts  951  having a simple shape, which contributes to high efficiency when the filter unit  9  is manufactured. Further, since the defining part  95  is provided on the cap  96 , the defining part  95  can be disposed as close to the corner of the groove-shaped flow path  33  as possible, whereby the defining part  95  can be prevented or suppressed from inhibiting the flow of the fluid. 
     Further, the defining part  95  may not have the pair of protruding parts  951 , and for example, one protruding part  951  may be omitted. 
     In addition, it is preferable that a width W 951  of each protruding part  951  is somewhat smaller than the width W 31  of the groove part  31 . 
     Although the pressure control device of the disclosure has been described above with the embodiments of the drawings, the disclosure is not limited thereto. Each part which configures the pressure control device can be replaced with any configuration which can exhibit the same function. Moreover, any component may be added. 
     Furthermore, the plate-shaped member attached to the body is not limited to a plate (a separate plate), and it may be another body in which a flow path is formed. 
     The embodiments of the disclosure are described in detail with reference to the accompanying drawings, which illustrate the examples to which the principles of the disclosure are applicable. It should be understood that the embodiments of the disclosure are not limited to those described above, but shall cover all variations, modifications, and equivalents within the scope of the disclosure. 
     Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises. 
     While preferred embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.