JP6268592B2 - Two-member connection structure - Google Patents

Description

  The present invention has a first member provided with a first locking groove on the outer periphery, a connecting hole that allows the first member to be inserted, and a second locking groove that opens on the inner periphery of the connecting hole. The second member is formed in a substantially C shape with a circular cross-sectional shape and is connected through a locking ring that engages with the first and second locking grooves. .

  In the pressure reducing valve, a holding plate as a first member provided with a first locking groove on the outer periphery, and a second locking groove having a connecting hole into which the holding plate can be inserted and opened to the inner periphery of the connecting hole And a diaphragm rod as a second member provided with a ring is formed in a substantially C shape with a circular cross-sectional shape and is connected via a locking ring that engages with the first and second locking grooves. The connection structure made is known from Patent Document 1. In this case, more than half of the cross section of the locking ring is present in the second locking groove in the engaged state with the second locking groove, and the holding plate and the diaphragm rod are separated from each other. When an axial external force is applied, the axial force out of the force acting on the locking ring from the holding plate is disposed on the open end side of the connecting hole on both side surfaces in the axial direction of the second locking groove. The force in a direction perpendicular to the axial direction is received at the groove bottom surface of the second locking groove, and the movement of the locking ring is performed at the one side surface and the groove bottom surface of the second locking groove. By being regulated, the connection between the holding plate and the diaphragm rod is maintained.

  In addition, the outer diameter of the locking ring in an unloaded state where no external force is applied is set to be larger than the diameter of the groove bottom surface of the second locking groove that opens to the inner periphery of the connection hole. When the holding plate with the locking ring engaged is inserted into the coupling hole, the inner circumference of the portion of the coupling hole in front of the second locking groove in the insertion direction to the coupling hole of the holding plate. The diameter of the locking ring is reduced by contact, and when the locking ring reaches the second locking groove, the locking ring expands in diameter and engages with the second locking groove, thereby holding the diaphragm rod. The plates are connected.

JP 2014-10784 A

  However, in the connection structure disclosed in Patent Document 1, the second locking groove is formed from the inner peripheral surface of the portion of the connecting hole that is in front of the second locking groove in the insertion direction of the holding plate into the connecting hole. The depth to the groove bottom surface is larger than the radius of the circular cross section of the locking ring, and when the holding plate and the diaphragm rod are connected, it is necessary to reduce the diameter of the locking ring to be larger than the diameter dimension of the circular cross section. For this reason, a large force is required when inserting the holding plate into the coupling hole so as to reduce the diameter of the locking ring, resulting in a decrease in assemblability. In addition, if the locking ring is deformed to the plastic deformation region, the locking ring does not return to the original outer diameter even in a no-load state, and there is a possibility that poor engagement occurs and the connection strength of the holding plate and the diaphragm rod is reduced. is there.

  The present invention has been made in view of such circumstances, and when connecting two members using a locking ring, the amount of diameter reduction of the locking ring is suppressed, and deterioration of assembling and poor engagement are avoided. It is an object of the present invention to provide a two-member connecting structure that can be made.

In order to achieve the above object, the present invention has a first member provided with a first locking groove on the outer periphery, a connecting hole into which the first member can be inserted, and an opening on the inner periphery of the connecting hole. The second member provided with the second locking groove is connected to the second member via a locking ring that is formed in a substantially C shape with a circular cross-sectional shape and engages with the first and second locking grooves. In the two-member connection structure, the outer diameter of the locking ring in an unloaded state is set to be equal to or larger than the diameter of the bottom surface of the second locking groove, and the locking ring is engaged with the first locking groove. When the joined first member is inserted into the connection hole, a reduced diameter guide hole portion for guiding the engagement ring to the second engagement groove side while reducing the diameter of the engagement ring is one of the connection holes. The first member is disposed adjacent to the front side of the second locking groove along the insertion direction of the first member into the connecting hole while forming a portion. , The depth from the inner peripheral surface of the reduced diameter guide hole portion to the groove bottom surface of the second engaging groove is set to a radius smaller than a circular cross-section of the locking ring, linked via the locking ring In the state where an external force acting in a direction away from each other acts on the first member and the second member, the front end along the insertion direction and the radial direction of the outer periphery of the circular cross section of the locking ring A first inclined surface that contacts between the inner ends along the first member is formed on the first member, and a second surface that contacts between the rear end along the insertion direction and the outer end along the radial direction of the outer periphery of the circular cross section of the locking ring. The first feature is that the slope is formed on the second member.

According to the present invention, in addition to the configuration of the first feature, the first inclined surface and the second inclined surface are formed such that an intersection of the extended lines of the inclined surfaces is on the radially inner side of the locking ring. The second feature.

The present invention has a first member provided with a first locking groove on the outer periphery, a connecting hole that allows the first member to be inserted, and a second locking groove that opens on the inner periphery of the connecting hole. The second member is formed in a substantially C shape with a circular cross-sectional shape and is connected via a locking ring that engages with the first and second locking grooves. The outer diameter of the locking ring in an unloaded state is set to be equal to or greater than the diameter of the groove bottom surface of the second locking groove, and the first locking groove is engaged with the first locking groove. When the member is inserted into the connecting hole, the reduced diameter guide hole portion that guides the engaging ring toward the second engaging groove while reducing the diameter of the engaging ring constitutes a part of the connecting hole. Is disposed adjacent to the front side of the second locking groove along the direction in which the member is inserted into the connecting hole, The depth from the surface to the groove bottom surface of the second engaging groove is the locking is set to a radius smaller than a circular cross section of the ring, a portion of the pressure reducing valve for opening and closing by the movement of the pressure reducing valve body caused by the operation of the diaphragm configured member coupled to the member being connected to the pressure reducing valve body side and the diaphragm side is one of those members and the first member, the third to be connected the other as the second member It is characterized by.

The present invention has a first member provided with a first locking groove on the outer periphery, a connecting hole that allows the first member to be inserted, and a second locking groove that opens on the inner periphery of the connecting hole. The second member is formed in a substantially C shape with a circular cross-sectional shape and is connected via a locking ring that engages with the first and second locking grooves. The outer diameter of the locking ring in an unloaded state is set to be equal to or greater than the diameter of the groove bottom surface of the second locking groove, and the first locking groove is engaged with the first locking groove. When the member is inserted into the connecting hole, the reduced diameter guide hole portion that guides the engaging ring toward the second engaging groove while reducing the diameter of the engaging ring constitutes a part of the connecting hole. Is disposed adjacent to the front side of the second locking groove along the direction in which the member is inserted into the connecting hole, The depth from the surface to the groove bottom surface of the second engaging groove is the locking is set to a radius smaller than a circular cross section of the ring, relative to a predetermined range of the main valve body, and its main valve having a pilot port A sub-valve element that constitutes a part of a valve with a pilot function together with the main valve element so as to open and close the pilot port by movement has one of the main valve element and the sub-valve element as a first member. A fourth feature is that the other member is the second member and the second member is connected so as to regulate the relative movement amount.

In addition to the configuration of the third or fourth feature, the present invention provides a main valve body having a pilot port, and the main port body is opened and closed by opening and closing the pilot port by relative movement within a predetermined range with respect to the main valve body. The sub-valve which forms part of the valve with a pilot function together with the valve body is configured such that one of the main valve body and the sub-valve body is the first member and the other is the second member. It is the fifth feature that they are connected so as to regulate the above.

  According to the first feature of the present invention, a part of the coupling hole is configured to reduce the diameter of the locking ring on the front side of the second locking groove in the insertion direction of the first member into the coupling hole. Since the reduced diameter guide hole portion is adjacently disposed and the depth from the inner peripheral surface of the reduced diameter guide hole portion to the groove bottom surface of the second locking groove is less than the radius of the circular cross section of the locking ring, the first When the first member in a state where the locking ring is engaged with the locking groove is inserted into the coupling hole, the diameter reduction amount by the reduced diameter guide hole portion of the locking ring can be suppressed, and the locking ring The force when inserting the first member into the coupling hole can be reduced by reducing the diameter, and the assemblability can be improved. Further, by suppressing the deformation amount of the locking ring, it is possible to prevent occurrence of poor engagement due to plastic deformation of the locking ring.

Also, in a state where an external force in a direction away from each other in the first and second members are connected via a locking ring is acting, the locking ring, the first and second members Surface contact will occur, and the possibility of wear or biting due to cornering can be eliminated.

According to the second feature of the present invention, an extension line of the first slope formed on the first member so as to contact the locking ring and the second member so as to contact the locking ring. A direction in which the extension line of the second inclined surface that is formed intersects with the first and second members connected via the locking ring by intersecting with the radial direction inside of the locking ring. When the external force acts, the direction of the resultant force acting on the locking ring from the first and second slopes is outward, so that the locking ring faces outward at the groove bottom surface of the second locking groove. All the movements are restricted, and the locking ring is not detached from the second locking groove, and the connected state of the first and second members is reliably maintained.

According to the third feature of the present invention, it is possible to improve the assemblability and reliability of the connection structure between the diaphragm of the pressure reducing valve and the pressure reducing valve body.

According to a fourth aspect of the present invention, it is possible to enhance the assembling property and reliability of the connection structure between the main valve body and the sub-valve body in the pilot function valve.

Furthermore, according to the fifth feature of the present invention, in the state where an external force acting in a direction separating from each other is acting on the first and second members connected via the locking ring, The first and second members are in surface contact with each other, and the possibility of wear or biting due to cornering can be eliminated.

It is a longitudinal cross-sectional view of the decompression device in a state where the decompression valve is opened and the shut-off valve is closed. FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG. 1. It is an expanded vertical sectional view of the connection part of a valve shaft and a diaphragm rod. FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 3. It is a figure corresponding to FIG. 4 of a reference example.

  An embodiment of the present invention will be described with reference to the accompanying drawings. First, in FIG. 1, this decompression device, for example, decompresses high-pressure natural gas fuel and supplies it to an engine (not shown). Mounted in the engine room of a vehicle, the body 5 has a pressure reducing valve 6 having a pressure reducing valve body 10 connected to a diaphragm 8 and a cutoff valve 7 having a cutoff valve body 78 driven by a solenoid 9. Are arranged.

  The body 5 is formed by connecting a first body member 12 and a second body member 13 disposed above the first body member 12 to each other. The first body member 12 includes an outer cylindrical portion 12a that extends vertically, a first inward flange portion 12b that projects radially inward from a lower portion of the outer cylindrical portion 12a, and a first coaxial member that is coaxial with the outer cylindrical portion 12a. An inner cylindrical portion 12c extending upward from an intermediate portion of the first inward flange portion 12b, and a short cylindrical portion 12d extending coaxially with the inner cylindrical portion 12c and slightly upward from the inner periphery of the first inward flange portion 12b. The sliding support hole 14 having a circular cross section that is formed integrally with the central portion of the first inward flange portion 12b and the short cylindrical portion 12d and is coaxial with the outer cylindrical portion 12a and the inner cylindrical portion 12c. Is formed.

  Further, the second body member 13 integrally has a fitting cylinder portion 13a fitted to the end portion on the second body member 13 side of the inner cylinder portion 12c, and a part of the fitting cylinder portion 13a is included in the fitting cylinder portion 13a. The formed accommodation hole 15 is provided in the second body member 13. The second body member 13 is integrally provided with a second inward flange portion 13b that projects radially inward from the end portion of the accommodation hole 15 on the diaphragm 8 side, that is, the distal end portion of the fitting tube portion 13a. . Moreover, the accommodation hole 15 includes a screw hole portion 15a opened to the opposite side of the diaphragm 8, and a fitting hole portion 15b having a smaller diameter than the screw hole portion 15a and disposed on the second inward flange portion 13b side. Are connected to the same axis.

An annular first seal member 16 is interposed between the outer cylinder portion 12a of the first body member 12 and the second body member 13, and the second body member fitted into the inner cylinder portion 12c of the first body member 12. An annular second seal member 17 is interposed between the 13 fitting tube portions 13a and the inner tube portion 12c.

  A decompression chamber 18 is formed between the first and second body members 12 and 13 so that the outer periphery is defined by the inner cylindrical portion 12 c of the first body member 12, and an outlet passage 19 that leads to the decompression chamber 18. Is connected to the connecting pipe 20 protruding from the side surface of the first body member 12. An annular passage 21 having an outer periphery and an inner periphery defined by the outer cylinder portion 12 a and the inner cylinder portion 12 c of the first body member 12 is formed between the first and second body members 12, 13, and the decompression chamber 18. A heating medium such as hot water for heating the inside flows through the annular passage 21.

  Referring also to FIG. 2, the pressure reducing valve 6 is formed in a ring shape with a pressure reducing valve seat 25 that opens a valve hole 24 communicating with the pressure reducing chamber 18 in the center thereof and is formed in a ring shape. A valve seat member 26 fixedly disposed in the fitting hole 15b of the housing hole 15, a valve shaft 27 loosely passing through the inside of the second inward flange 13b and the valve hole 24, and the pressure reducing valve seat 25, and a pressure-reducing valve body 10 made of synthetic resin that can be seated on the outer periphery of the valve shaft 27.

  In the fitting hole portion 15b of the receiving hole 15, a dish-shaped holding portion 28a opened toward the second inward flange portion 13b side, and a second inner side coaxially connected to the central portion of the holding portion 28a. A large-diameter cylindrical portion 28b extending to the opposite side of the facing flange portion 13b, a small-diameter cylindrical portion 28c formed smaller in diameter than the large-diameter cylindrical portion 28b and coaxially connected to the large-diameter cylindrical portion 28b, and the small-diameter cylindrical portion 28c 2 A housing 28 integrally having an end wall portion 28d that closes an end opposite to the inward flange portion 13b is inserted and fixed, and the valve seat member 26 is fixed to the holding portion 28a of the housing 28. Press-fitted into and fixed.

  An annular third seal member 29 that is coaxial with the valve hole 24 is mounted on the surface of the valve seat member 26 that faces the second inward flange 13b, and faces the housing 28 of the valve seat member 26. An annular fourth seal member 30 that is coaxial with the third seal member 29 is mounted on the surface.

  A valve chamber 31 for accommodating the pressure-reducing valve body 10 is formed in the housing 28, and the pressure-reducing valve seat 25 is tapered on the inner peripheral edge of the valve seat member 26 so as to face the valve chamber 31. The portion of the pressure-reducing valve body 10 seated on the pressure-reducing valve seat 25 is also tapered.

  The pressure-reducing valve body 10 is slidably supported by a large-diameter cylindrical portion 28b and a small-diameter cylindrical portion 28c of the housing 28. Between the large-diameter cylindrical portion 28b and the pressure-reducing valve body 10, An annular fifth seal member 32 that slides on the outer periphery of the pressure reducing valve body 10 and guides the movement of the pressure reducing valve body 10 is interposed. A first backup ring 33 is disposed between the stepped portion between the large diameter cylindrical portion 28 b and the small diameter cylindrical portion 28 c and the fifth seal member 32, and the fifth seal member 32 is connected to the first backup ring 33. A hook-shaped support member 34 is sandwiched between the large-diameter cylindrical portion 28b and the valve seat member 26.

  By the way, the pressure reducing valve body 10 has a valve opening position (a position indicated by a solid line in FIG. 2) where the pressure reducing valve body 10 is separated from the pressure reducing valve seat 25, and the pressure reducing valve seat 25. It is movable between the valve closing position where the pressure reducing valve body 10 is seated. A fifth seal member 32 seals the space between the small-diameter cylindrical portion 28c and the end wall portion 28d of the housing 28 and the valve shaft 27 and the valve body 10 for pressure reduction. Thus, a back pressure chamber 35 is formed, and the back pressure chamber 35 communicates with the decompression chamber 18 through a communication passage 36 provided in the valve shaft 27.

  The sliding support hole 14 formed in the short cylindrical portion 12d at the center of the first body member 12 has an annular sixth seal member 37 that elastically slides on the inner periphery of the sliding support hole 14. The diaphragm rod 38 having the outer periphery is fitted so as to be slidable.

  Referring also to FIG. 3, the diaphragm rod 38 is coaxially provided with a bottomed connecting hole 40 opened to the pressure reducing valve body 10 side. On the other hand, at the end of the valve rod 27 passing through the valve hole 24 to the diaphragm rod 38 side on the diaphragm rod 38 side, a reduced diameter shaft portion 27a and a diameter larger than the reduced diameter shaft portion 27a, First and second diameter-expanded shaft portions 27b and 27c are provided on both sides in the axial direction, and the first diameter-expanded shaft portion 27b is disposed on the pressure reducing valve body 10 side, and the second diameter-expanded shaft portion 27c. Is arranged on the diaphragm 8 side.

  A holding plate 41 is fitted in the connection hole 40, and the holding plate 41 has a large diameter portion 41 a arranged on the pressure reducing valve body 10 side and a small diameter arranged on the closed end side of the connection hole 40. Part 41b.

  The holding plate 41 is attached to the valve shaft 27. The end surface of the first and second diameter-expanded shaft portions 27b and 27c on the diameter-reduced shaft portion 27a side through the diameter-reduced shaft portion 27a loosely. The holding plate 41 is provided with a locking recess 42 opened to one side so as to be engaged.

  A first locking groove 47 disposed between the large-diameter portion 41a and the small-diameter portion 41b is provided on the outer periphery of the holding plate 41. On the other hand, an annular second locking groove 48 corresponding to the first locking groove 47 is provided on the inner periphery of the connecting hole 40, and has a substantially C-shape having one opening while having a circular cross-sectional shape. A locking ring 49, which is an elastic ring, is engaged with the first and second locking grooves 47 and 48 to allow the valve shaft 27 to expand and contract along the radial direction. That is, the holding plate 41 as the first member and the diaphragm rod 38 as the second member are connected via the locking ring 49.

  The outer diameter of the locking ring 49 in an unloaded state where no external force is applied is set to be equal to or larger than the diameter D of the groove bottom surface 48a of the second locking groove 48.

The connecting hole 40 has a diameter that tapers outward from the open end side toward the valve seat member 26 along the insertion direction 43 of the holding ring 41 into the connecting hole 40. The tapered hole portion 40a, the reduced diameter guide hole portion 40b whose one end is connected to the small diameter end of the tapered hole portion 40a, and the bottomed hole portion 40c formed larger in diameter than the reduced diameter guide hole portion 40b. The second locking groove 48 is disposed between the reduced diameter guide hole 40b and the bottomed hole 40c.

  A reduced-diameter guide hole portion 40b that is disposed adjacent to the front side of the second locking groove 48 along the insertion direction 43 and forms a part of the connection hole 40 is engaged with the first locking groove 47. When the holding plate 41 in a state in which the stop ring 49 is engaged is inserted into the connection hole 40, the locking ring 49 is guided to the second locking groove 48 side while reducing the diameter.

  Moreover, the depth d from the inner peripheral surface of the reduced diameter guide hole 40 b to the groove bottom surface 48 a of the second locking groove 48 is set to be less than the radius R of the circular cross section of the locking ring 49.

  Referring also to FIG. 4, in the state where an external force acting in a direction away from each other is acting on the holding plate 41 and the diaphragm rod 38 connected through the locking ring 49, the holding plate 41. The locking ring 49 comes into contact with the front side surface along the insertion direction 43 of the first locking groove 47 in the rear side surface of the second locking groove 48 of the diaphragm rod 38 along the insertion direction 43. The locking ring 49 comes into contact with the first inclined surface 51 that contacts between the front end PF along the insertion direction 43 and the inner end PI along the radial direction of the outer periphery of the circular cross section of the locking ring 49. The first locking groove 47 is formed on the holding plate 41 so as to constitute a part of the front side surface along the insertion direction 43, and has a circular cross section of the locking ring 49. Of the circumference, the second slope 52 that contacts between the rear end PR along the insertion direction 43 and the outer end PO along the radial direction constitutes a rear side surface along the insertion direction 43 of the second locking groove 48. In this way, the diaphragm rod 38 is formed.

  In addition, the first inclined surface 51 and the second inclined surface 52 are formed so that the intersection point P between the extended lines L1 and L2 of the inclined surfaces 51 and 52 is on the radially inner side of the locking ring 49.

  Between the closed end of the connecting hole 40 and the holding plate 41, a set spring 50 is urged to urge the holding plate 41 toward the valve opening side of the pressure reducing valve body 10. As a result, the inner surface of the first locking groove 47 on the set spring 50 side and the locking ring 49 are held in contact with each other, and the pressure reducing valve body 10 of the locking ring 49 and the second locking groove 48 is maintained. The inner side surface on the side is held in contact.

  Referring again to FIG. 1, the first body member 12 on the side opposite to the second body member 13 has an end wall 55 a on the side opposite to the first body member 12 and is formed into a bottomed cylindrical shape. 55 is fastened so as to sandwich the peripheral edge of the diaphragm 8 with the first body member 12, and the diaphragm rod 38 is connected to the central portion of the diaphragm 8. That is, the diaphragm rod 38 has a shaft portion 38a extending in the direction opposite to the opening direction of the connecting hole 40 coaxially and integrally, and this shaft portion 38a is formed between the diaphragm rod 38 and the central portion of the diaphragm 8. A ring-shaped first retainer 56 sandwiched between the first retainer 56 and a ring-shaped second retainer 57 sandwiching the central portion of the diaphragm 8 between the first retainer 56 and the protrusion from the second retainer 57 The central portion of the diaphragm 8 is connected to the shaft portion 38a by caulking a part of the outer periphery of the shaft portion 38a and engaging the second retainer 57. An annular seventh seal member 58 is interposed between the diaphragm rod 38 and the first retainer 56.

  A pressure acting chamber 59 is formed between the diaphragm 8 and the first body member 12, and a control pressure chamber 60 is provided between the diaphragm 8 and the diaphragm cover 55 so as to face the other surface of the diaphragm 8. The first body member 12 is provided with a communication passage 61 that is formed and communicates the outlet passage 19 that leads to the decompression chamber 18 to the pressure action chamber 59. In addition, a coiled diaphragm spring 62 accommodated in the control pressure chamber 60 is contracted between the diaphragm cover 55 and the diaphragm 8. The diaphragm cover 55 is connected to a negative pressure introduction pipe 63 that communicates with the control pressure chamber 60. The negative pressure introduction pipe 63 is connected to the engine, and introduces the intake negative pressure of the engine into the control pressure chamber 60. It is like that.

  A support cylinder 64 projecting toward the control pressure chamber 60 is integrally provided at the center portion of the end wall 55a of the diaphragm cover 55 so that the diaphragm cover 55 can be rotated from the outside. A screw 65 is screwed into the support cylinder 64 so that one end of the screw 65 enters the control pressure chamber 60, and an annular eighth seal member 66 is interposed between the support cylinder 64 and the adjustment screw 65. The The control pressure chamber 60 accommodates a bottomed cylindrical spring seat member 67 that covers the support cylinder 64 by bringing one end of the adjustment screw 65 into contact with the central portion of the closed end. The spring 62 is contracted between the spring seat member 67 and the second retainer 57 fixed to the diaphragm 8 at the center. The spring seat member 67 can be moved back and forth by rotating the adjusting screw 65, whereby the spring load of the diaphragm spring 62 can be adjusted.

  In the pressure reducing valve 6, when the diaphragm 8 is bent toward the control pressure chamber 60 against the spring force of the diaphragm spring 62 due to the pressure in the pressure acting chamber 59, that is, the pressure in the pressure reducing chamber 18, the diaphragm rod 38 is moved. By pulling the valve shaft 27 through the holding plate 41, the pressure-reducing valve body 10 is seated on the pressure-reducing valve seat 25 and closed, and the diaphragm 8 is moved to the pressure-action chamber 59 by the pressure drop of the pressure-action chamber 59. When bent sideways, the diaphragm rod 38 pushes the valve shaft 27 via the holding plate 41, so that the pressure reducing valve body 10 is separated from the pressure reducing valve seat 25 and opened, and such a pressure reducing valve body is opened. By repeating the seating and separation of the ten pressure reducing valve seats 25, the high pressure gas fuel from the valve chamber 31 is guided to the decompression chamber 18 after being decompressed.

  As described above, the connecting spring 40 of the diaphragm rod 38 is provided with a set spring 50 that biases the holding plate 41 toward the valve opening side of the pressure reducing valve body 10. Accordingly, the inner surface of the first locking groove 47 of the holding plate 41 on the set spring 50 side, the locking ring 49, the locking ring 49 and the second locking groove 48 of the diaphragm rod 38 on the pressure reducing valve body 10 side. Since the inner side surfaces are held in contact with each other, the contact state can be maintained when the diaphragm 8 is pushed and pulled with respect to the valve shaft 27, and therefore the contact portion is separated and contacted which causes abnormal noise. Can be prevented from repeating. In addition, since there is no response delay of the pressure reducing valve body 10 with respect to the movement of the diaphragm 8, it can contribute to the improvement of the pressure regulating performance.

  The solenoid housing 68 of the solenoid 9 in the shut-off valve 7 is formed in a bottomed cylindrical shape with the opposite side of the body 5 opposite to the second body member 13, and the second body member 13 of the solenoid housing 68. At the open end on the side, a holder 69 integrally having a cylindrical portion 69a in which a male screw screwed into the screw hole portion 15a of the accommodation hole 15 in the second body member 13 is engraved on the outer periphery is fixed. The solenoid housing 68 is fixed to the second body member 13 of the body 5 by screwing the male screw 69a into the screw hole 15a.

  The solenoid 9 includes a movable core 70 and a guide cylinder 71 made of a non-magnetic material into which the movable core 70 is inserted so as to be movable in the axial direction. 69 is inserted into the accommodation hole 15 in the second body member 13. The guide cylinder 71 has a small diameter portion 71a penetrating the holder 69, a diameter larger than the small diameter portion 71a, and is fitted in the fitting hole portion 15b of the receiving hole 15. A large-diameter portion 71b that is coaxially connected to one end of the small-diameter portion 71a is integrally formed and fixed to the second body member 13.

  The guide tube 71 has a small-diameter hole 74 into which the movable core 70 is inserted coaxially, and a large-diameter hole 75 that is formed in a larger diameter than the small-diameter hole 74 and opens at one end of the large-diameter portion 71b. The large diameter portion 71b is formed so as to be coaxially connected at the axially intermediate portion.

In addition, one end of the large-diameter portion 71b is in contact with the holding portion 28a of the housing 28 from the side opposite to the second inward flange 13b, and the guide cylinder 71 is between the second inward flange 13b. An annular ninth seal member 76 and a second back that are fixed to the second body member 13 so as to sandwich the housing 28 and elastically contact the inner periphery of the fitting hole 15b. An up ring 77 is attached to the outer periphery of the large diameter portion 71b.

  The guide tube 71 is formed with an annular step portion 71c facing the second inward flange portion 13b at the connecting portion of the small diameter portion 71a and the large diameter portion 71b. One end of the cylindrical portion 69a of the holder 69 screwed into the 15 screw hole portions 15a contacts the stepped portion 71c. Accordingly, the holder 69 holds the diaphragm 8 in the housing hole 15 so as to sandwich the large diameter portion 71b of the guide cylinder 71 and the holding portion 28a of the housing 28 with the second inwardly facing flange portion 13b. Is screwed into the screw hole 15a at the opposite end.

  The shut-off valve 7 has a main valve body 78 having a pilot port 80 and a predetermined range with respect to the main valve body 78 so as to open and close the pilot port 80 by relative movement of the main valve body 78 within a predetermined range. And a sub-valve element 79 that is assembled to the main valve element 78 so as to be capable of relative movement, and is configured as a valve with a pilot function. The sub-valve element 79 is an end of the movable core 70. Formed. The main valve body 78 is inserted into the fitting hole 15b in the accommodation hole 15 of the second body member 13, and the housing 28 of the pressure reducing valve 6 is accommodated coaxially in the main valve body 78. .

  The main valve body 78 includes a stepped cylindrical portion 78a that coaxially covers the large-diameter cylindrical portion 28b and the small-diameter cylindrical portion 28c of the housing 28, and protrudes radially outward from one end of the stepped cylindrical portion 78a. The holding portion 28a has a flange portion 78b opposed to the second inward flange portion 13b from the opposite side, and a pilot port 80 coaxial with the central axis of the stepped cylindrical portion 78a at the center portion. An end wall portion 78c that closes the other end portion of the attached cylindrical portion 78a is formed integrally with a bottomed cylinder, and an outer surface of the central portion of the end wall portion 78c in the main valve body 78 is formed on the outer surface. A projecting portion 78d forming a part of the pilot port 80 is integrally projected toward the movable core 70 side. The stepped cylindrical portion 78 a of the main valve body 78 is coaxially inserted into the small diameter hole 74 of the guide cylinder 71, and the flange portion 78 b is coaxially disposed in the large diameter hole 75 of the guide cylinder 71. The

  An annular first rubber seal 81 is embedded in the flange portion 78b of the main valve body 78 so as to face the surface of the holding portion 28a of the housing 28 opposite to the second inward flange portion 13b. A shut-off valve seat 82 on which the first rubber seal 81 can be seated is formed in the housing 28, and the shut-off valve projects in an annular shape so that the first rubber seal 81 is seated on the holding portion 28 a of the housing 28. A valve seat 82 is formed.

  By the way, an annular recess 83 is provided on the outer periphery of the large diameter portion 71b of the guide cylinder 71 between the ninth seal member 76 and the holding portion 28a of the housing 28, and an inlet passage 84 leading to the annular recess 83 is the second. A connecting member 85 provided on the body member 13 for connecting a conduit for guiding high-pressure gas fuel to the inlet passage 84 is attached to a side surface of the second body member 13.

  The large diameter portion 71b of the guide cylinder 71 is provided with a plurality of first communication holes 86 that allow the annular recess 83 to communicate with the large diameter hole 75. The large diameter cylindrical portion 28b of the housing 28 has the pressure reducing valve 6 A plurality of second communication holes 87 communicating with the valve chamber 31 are provided. Thus, the inlet passage 84, the annular recess 83, the first communication hole 86, and the second communication hole 87 constitute a high pressure passage 88 that guides high pressure gas fuel to the pressure reducing valve 6 side. 7 and the shut-off valve seat 82 are disposed between the first and second communication holes 86 and 87 in the middle of the high-pressure passage 88.

The sub-valve element 79 is integrally formed at the end of the movable core 70 so as to form a bottomed connecting hole 90 into which an insertion portion 91 provided in the main valve element 78 is inserted. part 91 is made up of part of the stepped cylindrical portion 78a of the main valve body 78 and the end wall portion 78c. A pilot valve chamber 92 is formed between the sub valve body 79 and the main valve body 78, and a first communication hole 86 communicating with the inlet passage 84 via the annular recess 83 is communicated with the pilot valve chamber 92. A first passage 93 is formed between the guide cylinder 71 and the main valve body 78, and a second communication hole 87 communicating with the valve chamber 31 is formed in the pilot port 80 between the housing 28 and the main valve body 78. A second passage 94 is formed for communication.

  A second rubber seal 95 is embedded in the central portion of the closed end of the connection hole 90, and the second rubber seal 95 comes into contact with the protrusion 78 d of the insertion portion 91 of the main valve body 78, and the pilot port 80. The state in which the second rubber seal 95 is separated from the projection 78d and the pilot port 80 is opened is switched according to whether the solenoid 9 is de-energized or energized. The movable core 70, that is, the auxiliary valve body 79 is operated.

  By the way, the main valve body 78 as the first member and the sub-valve body 79 as the second member are connected so as to be capable of axial relative movement within a predetermined range. An annular first locking groove 96 is formed on the outer periphery of the insertion portion 91 at 78, and a C-shaped locking ring 98 that can be elastically deformed so as to expand and contract according to the action of an external force is provided in the first locking groove 96. Is engaged. The sub-valve element 79 is formed with an annular second locking groove 97 that opens to the inner periphery of the connecting hole 90 so as to engage the locking ring 98. The groove 97 is formed to be long in the axial direction in order to allow relative movement of the main valve body 78 and the sub valve body 79 in a predetermined range.

  Such a connection structure of the main valve body 78 and the sub valve body 79 is not described in detail, but is configured similarly to the connection structure of the holding plate 41 and the diaphragm rod 38 in the pressure reducing valve 6.

  In addition, when the solenoid valve 9 is in a non-energized state and the sub-valve element 79 is closed, as shown in FIG. 1, when the pilot port 80 is closed, the main valve element 78 and the sub-valve element 79 A clearance along the moving direction is formed between the side surface on the open end side of the sub-valve element 79 and the locking ring 98 on both side surfaces in the axial direction of the second locking groove 97, but the solenoid 9 is energized. When the sub-valve element 79 moves to the side where the pilot port 80 is opened, after the pilot port 80 is opened, the sub-valve element 79 of the both side surfaces in the axial direction of the second locking groove 97 The side surface on the open end side engages with the locking ring 98, and the main valve body 78 is driven to the valve opening position side.

  In such a shut-off valve 7, when the engine is stopped, the solenoid 9 is deenergized so that the movable core 70 moves to the main valve body 78 side. As shown in FIG. 2, the first rubber seal of the main valve body 78 is moved. 81 is seated on the shut-off valve seat 82 and the first and second communication holes 86 and 87 are shut off, and the second rubber seal 95 of the sub-valve element 79 abuts against the projection 78d to close the pilot port 80. As a result, the pilot valve chamber 92 and the second passage 94 are also shut off, and the supply of high-pressure gas fuel to the valve chamber 31 is stopped.

On the other hand, when the solenoid 9 during operation of the engine is started and energized state, first the movable core 70 is moved in a direction in which Ru is separating the second rubber seal 95 of the sub-valve body 79 from the protruding portion 78d to form the pilot port 80, the The second passage 94 communicating with the valve chamber 31 through the two communication holes 87 communicates with the pilot valve chamber 92 through the pilot port 80. As a result, high-pressure gas fuel gradually flows from the inlet passage 84 to the pilot port 80 through the annular recess 83, the first communication hole 86, the first passage 93 and the pilot valve chamber 92. As a result, the difference in pressure acting on the main valve element 78 from both sides is reduced.

When the driving force of the solenoid 9 overcomes the force in the valve closing direction based on the differential pressure acting on the main valve body 78, the sub valve body 79 is engaged with the locking ring 98 to engage the sub ring body 98. The sub-valve element 79, that is, the movable core 70 connected to the main valve element 78 further moves, the first rubber seal 81 of the main valve element 78 is separated from the shut-off valve seat 82, and from the high-pressure passage 88 to the valve chamber 31 side. Gas fuel will flow into the tank.

  Next, the operation of this embodiment will be described. A part of the pressure reducing valve 6 that opens and closes by the movement of the pressure reducing valve body 10 accompanying the operation of the diaphragm 8 and is connected to the pressure reducing valve body 10 side. A first locking groove 47 is formed on the outer periphery of the plate 41, has a connection hole 40 into which the holding plate 41 can be inserted, and a second locking groove 48 that opens to the inner periphery of the connection hole 40. The diaphragm rod 38 connected to the diaphragm 8 side and the holding plate 41 are formed in a substantially C shape with a circular cross section and are engaged with the first and second locking grooves 47 and 48. The outer diameter of the locking ring 49 in an unloaded state is set to be equal to or larger than the diameter D of the groove bottom surface 48a of the second locking groove 48. Locking groove 47 A reduced diameter guide that guides the locking ring 49 toward the second locking groove 48 while reducing the diameter when the holding plate 41 in a state in which the locking ring 49 is engaged is inserted into the connecting hole 40. A hole 40b is disposed adjacent to the front side of the second locking groove 48 along the insertion direction 43 of the holding plate 41 into the connection hole 40 while constituting a part of the connection hole 40, A depth d from the inner peripheral surface of the diameter guide hole 40 b to the groove bottom surface 48 a of the second locking groove 48 is set to be less than the radius R of the circular cross section of the locking ring 49.

  Therefore, when the holding plate 41 with the locking ring 49 engaged with the first locking groove 47 is inserted into the connecting hole 40, the amount of diameter reduction by the reduced diameter guide hole portion 40b of the locking ring 49 is suppressed. The locking ring 49 can be reduced in diameter so that the force when inserting the holding plate 41 into the connecting hole 40 can be reduced, and the amount of deformation of the locking ring 49 can be reduced to reduce the locking ring 49. The occurrence of poor engagement due to plastic deformation of 49 can be prevented. As a result, the assemblability and reliability of the connection structure between the diaphragm 8 of the pressure reducing valve 6 and the pressure reducing valve body 10 can be improved.

  Further, of the outer periphery of the circular cross section of the locking ring 49 in the state where an external force acting in a direction away from each other is acting on the holding plate 41 and the diaphragm rod 38 connected via the locking ring 49. A first inclined surface 51 that contacts between the front end PF along the insertion direction 43 and the inner end PI along the radial direction is formed on the holding plate 41, and is arranged in the insertion direction 43 on the outer periphery of the circular cross section of the locking ring 49. Since the second inclined surface 52 that contacts the rear end PR along the radial direction and the outer end PO along the radial direction is formed on the diaphragm rod 38, an external force acting in a direction away from each other acts on the holding plate 41 and the diaphragm rod 38. In this state, the locking ring 49, the holding plate 41 and the diaphragm rod 38 are in surface contact with each other. The possibility of wear and biting due have enough results can be eliminated.

  In addition, the first inclined surface 51 and the second inclined surface 52 are formed so that the intersection point P between the extended lines L1 and L2 of the inclined surfaces 51 and 52 is located on the radially inner side of the engaging ring 49. 49, when an external force acting in a direction away from each other acts on the holding plate 41 and the diaphragm rod 38 connected via 49, the first and second inclined surfaces 51 and 52 are engaged. Since the direction of the resultant force F acting on the ring 49 is outward, the outward movement of the locking ring 49 is restricted by the groove bottom surface 48a of the second locking groove 48. The stop ring 49 is not detached from the second locking groove 48, and the connection state of the holding plate 41 and the diaphragm rod 38 is reliably maintained.

On the other hand, as in the reference example shown in FIG. 5, in the state where the external force acting in the direction away from each other is acting on the holding plate 41 and the diaphragm rod 38, Of these, an extension line L1 ′ of the first inclined surface 51 ′ formed on the holding plate 41 so as to contact between the front end PF along the insertion direction 43 and the inner end PI along the radial direction, and the locking ring 49 An extension line L2 ′ of the second inclined surface 52 ′ formed on the diaphragm rod 38 so as to be in contact with the rear end PR along the insertion direction 43 and the outer end PO along the radial direction in the outer periphery of the circular cross section. In the case where they intersect at an intersection P ′ on the radially outer side of the locking ring 49, an external force in a direction away from the holding plate 41 and the diaphragm rod 38. When acted, the direction of the resultant force F ′ of the force acting on the locking ring 49 from the first and second inclined surfaces 51 ′, 52 ′ is inward, so that the locking ring 49 moves inward and the second There is a possibility that the locking groove 48 will come off.

  The main valve body 78 having the pilot port 80 and the main valve body 78 together with the main valve body 78 are opened and closed by relative movement of the main valve body 78 within a predetermined range of the shut-off valve 7 having a pilot function. The sub-valve element 79 constituting a part is connected with a connecting structure similar to the connecting structure of the holding plate 41 and the diaphragm rod 38 in the pressure reducing valve 6, so that the main valve element 78 in the shut-off valve 7 with a pilot function is connected. Further, the assemblability and reliability of the connecting structure between the auxiliary valve bodies 79 can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

6 ... Pressure reducing valve 7 ... Shut-off valve 8 which is a valve with a pilot function 8 ... Diaphragm 10 ... Valve body 38 for pressure reduction ... Diaphragm rods 40, 90 ... which are second members Hole 40b ... Reduced diameter guide hole 41 ... Holding plate 43 as first member ... Insertion direction 47, 96 ... First locking groove 48, 97 ... Second locking groove 48a ... groove bottom surface 49, 98 ... locking ring 51 ... first slope 52 ... second slope 78 ... main valve element 79 as a first member ... second member The secondary valve body 80 is a pilot port d is a depth D from the inner peripheral surface of the reduced diameter guide hole portion to the groove bottom surface of the second locking groove, and is a diameter L1, L2 of the groove bottom surface.・ Slope extension line P ・ ・ ・ Intersection point PF of the extension line ・ ・ ・ Front end PI along the insertion direction of the outer circumference of the circular cross section of the locking ring ・ ・ ・Inner end PO along the radial direction of the outer periphery of the circular cross section of the ring ... Outer end PR along the radial direction of the outer periphery of the circular cross section of the locking ring ... Insertion direction of the outer periphery of the circular cross section of the locking ring Rear end R along the radius of the circular cross section of the locking ring

Claims (5)

While having a first member (41, 78) provided with a first locking groove (47, 96) on the outer periphery and a connecting hole (40, 90) into which the first member (41, 78) can be inserted. The second member (38, 79) provided with the second locking groove (48, 97) that opens to the inner periphery of the connection hole (40, 90) has a substantially C-shape with a circular cross-sectional shape. In a two-member connecting structure formed and connected via a locking ring (49, 98) that engages with the first and second locking grooves (47, 96; 48, 97),
The outer diameter of the locking ring (49, 98) in an unloaded state is set to be equal to or larger than the diameter (D) of the groove bottom surface (48a) of the second locking groove (48, 97), and the first locking groove When the first member (41, 78) in a state where the locking ring (49, 98) is engaged with (47, 96) is inserted into the connecting hole (40, 90), the locking A reduced diameter guide hole (40b) for guiding the ring (49, 98) to the second locking groove (48, 97) side while reducing the diameter of the ring (49, 98) constitutes a part of the connection hole (40, 90). The first member (41, 78) is disposed adjacent to the front side of the second locking groove (48, 97) along the insertion direction (43) into the connection hole (40, 90), and The depth (d) from the inner peripheral surface of the diameter guide hole (40b) to the groove bottom surface (48a) of the second locking groove (48, 97) is the locking ring ( Is set to less than the radius (R) of the circular cross section of 9,98),
An external force acting in a direction away from each other acts on the first member (41, 78) and the second member (38, 79) connected via the locking ring (49, 98). In the state, the first inclined surface (51) which contacts between the front end (PF) along the insertion direction (43) and the inner end (PI) along the radial direction in the outer periphery of the circular cross section of the locking ring (49, 98). ) Is formed on the first member (41, 78), and the rear end (PR) along the insertion direction (43) and the outer side along the radial direction of the outer periphery of the circular cross section of the locking ring (49, 98). coupling structure of two members second inclined surface (52), characterized in Rukoto formed in the second member (38,79) that contact between the edge (PO). The first inclined surface (51) and the second inclined surface (52) are such that the intersection (P) of the extended lines (L1, 12) of the inclined surfaces (51, 52) is the radially inner side of the locking ring (49, 98). The two-member connecting structure according to claim 1 , wherein the two-member connecting structure is formed so as to exist in While having a first member (41, 78) provided with a first locking groove (47, 96) on the outer periphery and a connecting hole (40, 90) into which the first member (41, 78) can be inserted. The second member (38, 79) provided with the second locking groove (48, 97) that opens to the inner periphery of the connection hole (40, 90) has a substantially C-shape with a circular cross-sectional shape. In a two-member connecting structure formed and connected via a locking ring (49, 98) that engages with the first and second locking grooves (47, 96; 48, 97),
The outer diameter of the locking ring (49, 98) in an unloaded state is set to be equal to or larger than the diameter (D) of the groove bottom surface (48a) of the second locking groove (48, 97), and the first locking groove When the first member (41, 78) in a state where the locking ring (49, 98) is engaged with (47, 96) is inserted into the connecting hole (40, 90), the locking A reduced diameter guide hole (40b) for guiding the ring (49, 98) to the second locking groove (48, 97) side while reducing the diameter of the ring (49, 98) constitutes a part of the connection hole (40, 90). The first member (41, 78) is disposed adjacent to the front side of the second locking groove (48, 97) along the insertion direction (43) into the connection hole (40, 90), and The depth (d) from the inner peripheral surface of the diameter guide hole (40b) to the groove bottom surface (48a) of the second locking groove (48, 97) is the locking ring ( Is set to less than the radius (R) of the circular cross section of 9,98),
A member (41) which constitutes a part of the pressure reducing valve (6) which opens and closes by the movement of the pressure reducing valve body (10) accompanying the operation of the diaphragm (8) and is connected to the pressure reducing valve body (10) side; The member (38) connected to the diaphragm (8) side is connected with one (41) of the members (38, 41) as a first member and the other (38) as a second member. coupling structure of two members you characterized. While having a first member (41, 78) provided with a first locking groove (47, 96) on the outer periphery and a connecting hole (40, 90) into which the first member (41, 78) can be inserted. The second member (38, 79) provided with the second locking groove (48, 97) that opens to the inner periphery of the connection hole (40, 90) has a substantially C-shape with a circular cross-sectional shape. In a two-member connecting structure formed and connected via a locking ring (49, 98) that engages with the first and second locking grooves (47, 96; 48, 97),
The outer diameter of the locking ring (49, 98) in an unloaded state is set to be equal to or larger than the diameter (D) of the groove bottom surface (48a) of the second locking groove (48, 97), and the first locking groove When the first member (41, 78) in a state where the locking ring (49, 98) is engaged with (47, 96) is inserted into the connecting hole (40, 90), the locking A reduced diameter guide hole (40b) for guiding the ring (49, 98) to the second locking groove (48, 97) side while reducing the diameter of the ring (49, 98) constitutes a part of the connection hole (40, 90). The first member (41, 78) is disposed adjacent to the front side of the second locking groove (48, 97) along the insertion direction (43) into the connection hole (40, 90), and The depth (d) from the inner peripheral surface of the diameter guide hole (40b) to the groove bottom surface (48a) of the second locking groove (48, 97) is the locking ring ( Is set to less than the radius (R) of the circular cross section of 9,98),
A main valve body (78) having a pilot port (80) and the main valve body (78) so as to open and close the pilot port (80) by relative movement within a predetermined range with respect to the main valve body (78). In addition, a sub-valve element (79) that constitutes a part of the pilot function valve (7) has one of the main valve element (78) and the sub-valve element (79) as a first member and the other as a first element. coupling structure of two members, characterized in that it is connected so as to restrict the relative movement amount of the cross while the second member. An external force acting in a direction away from each other acts on the first member (41, 78) and the second member (38, 79) connected via the locking ring (49, 98). In the state, the first inclined surface (51) which contacts between the front end (PF) along the insertion direction (43) and the inner end (PI) along the radial direction in the outer periphery of the circular cross section of the locking ring (49, 98). ) Is formed on the first member (41, 78), and the rear end (PR) along the insertion direction (43) and the outer side along the radial direction of the outer periphery of the circular cross section of the locking ring (49, 98). The two-member connection structure according to claim 3 or 4, wherein the second inclined surface (52) contacting between the ends (PO) is formed on the second member (38, 79).

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