JP2011070420A - Pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve having a valve seat member having a valve seat, a valve guide member to be coupled to the valve seat member by press fit, a valve element to be guided by the valve guide member, and a cylindrical filter to be assembled between the valve seat member and the valve guide member, the pressure reducing valve preventing a foreign matter from flowing into a valve chamber by bringing a filter into close contact with a valve seat member and a valve guide member by means of a simple arrangement that does not require high dimensional accuracy. <P>SOLUTION: The filter 25 is formed into a cylindrical shape by sintering metallic beads. One of the valve seat member 23 and the valve guide member 22 is formed with a taper surface 29 coaxially with the filter 25, the taper surface 29 being in contact with a corner 34 on the inner or outer peripheral side of one end of the filter 25. The other one of the valve seat member 23 and the valve guide member 22 is formed with a receiving surface 30 to be in contact with the other end of the filter 25. When the valve seat member 23 and the valve guide member 22 are pressed in, the taper surface 29 is brought into close contact with the corner 34 so as to crush the corner 34, while the other end of the filter 25 is brought into close contact with the receiving surface 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a valve seat member having a valve seat having a valve hole opened at a central portion, a valve guide member coupled to the valve seat member, and enabling the seat to be seated on the valve seat. A valve body to be guided; and a cylindrical filter that is formed between the valve seat member and the valve guide member and filters high-pressure LPG fuel flowing into a valve chamber that houses at least a part of the valve body. Further, the present invention relates to a pressure reducing valve in which the valve seat member and the valve guide member are coupled by press fitting, and the filter is assembled between the valve seat member and the valve guide member.

  Such a pressure reducing valve is disclosed in Patent Document 1, for example.

JP 2008-267558 A

  In the pressure reducing valve disclosed in Patent Document 1, a valve guide member is fitted and fixed to a tip portion of a cylindrical portion provided integrally with a valve seat member, and is cylindrical so as to surround the cylindrical portion coaxially. A filter in which a filter element made of synthetic resin is mounted on a synthetic resin filter frame to be formed is sandwiched between a valve seat member and a valve guide member. Thus, in order to prevent the inflow of foreign matter into the valve chamber from the gap between the filter frame, the valve seat member and the valve guide member, the inner periphery on one end side of the filter frame is placed on the outer periphery of the tip end portion of the cylindrical portion. One end of the filter frame is pressed and crushed against the valve guide member while closely contacting by light press fitting, and the other end of the filter frame is brought into close contact with the valve seat member.

  However, the close contact structure by light press-fitting between the inner periphery on one end side of the filter frame and the outer periphery of the tip end portion of the cylindrical portion of the valve seat member requires high dimensional accuracy, and one end of the filter frame is used as a valve guide member. Since it is pressed and crushed, the strength of the filter frame is required.

  The present invention has been made in view of such circumstances, and prevents the inflow of foreign matter into the valve chamber by bringing the filter into close contact with the valve seat member and the valve guide member with a simple configuration that does not require high dimensional accuracy. An object of the present invention is to provide a pressure reducing valve that can be used.

  In order to achieve the above object, the present invention provides a valve seat member having a valve seat having a valve hole opened at a central portion, a valve guide member coupled to the valve seat member, and a seat on the valve seat. A high pressure LPG fuel flowing between a valve body guided by the valve guide member and a valve chamber formed between the valve seat member and the valve guide member and accommodating at least a part of the valve body. A pressure reducing valve in which the valve seat member and the valve guide member are coupled by press-fitting, and the filter is assembled between the valve seat member and the valve guide member. A tapered surface that is in contact with a corner on the inner peripheral side or the outer peripheral side of the filter is formed coaxially with the filter on one of the valve seat member and the valve guide member. A receiving surface for contacting the other end of the filter is formed on the other side of the valve seat member and the valve guide member so as to crush the corner portion when the valve seat member and the valve guide member are press-fitted. The taper surface is brought into close contact with the corner portion, and the other end of the filter is brought into close contact with the receiving surface.

  According to the present invention, in addition to the configuration of the first feature, an annular protrusion protruding toward the other side of the valve seat member and the valve guide member is integrally formed with one of the valve seat member and the valve guide member. The tapered surface is formed on one of the inner periphery and the outer periphery of the annular protrusion, and is press-fitted into the other of the valve seat member and the valve guide member on the other of the inner periphery and the outer periphery of the annular protrusion. A second feature is that a press-fitting surface is formed.

  According to the present invention, in addition to the configuration of the first or second feature, the tapered surface having a larger diameter toward the filter side is formed at a corner portion on the outer peripheral side of the filter defining the outer periphery of the valve chamber. A third feature is that the valve seat member and the valve guide member are formed so as to be in close contact with each other.

  Furthermore, in addition to any one of the configurations of the first to third features, the present invention provides at least a valve shaft that is formed on the valve seat member and is coaxially connected to the valve body. Than the first mounting hole, a first mounting hole for mounting an annular seal member that elastically slides on the valve body or the outer periphery of the valve shaft to the valve guide member that slidably fits one side A second mounting hole having a large diameter and coaxially connected to one end of the first mounting hole and opened to the valve chamber side forms an annular stepped portion facing the valve chamber side. A ring-shaped seal holding member provided coaxially and forming the receiving surface against which the other end of the filter abuts is provided on the stepped portion so as to prevent the seal member from coming out of the first mounting hole. The fourth feature is that it is fitted into the second mounting hole while abutting. To.

  The first seal member 44 of the embodiment corresponds to the seal member of the present invention, and the second step portion 48 of the embodiment corresponds to the step portion of the present invention.

  According to the first feature of the present invention, a tapered surface formed on one of the valve seat member and the valve guide member is brought into contact with the corner portion on the inner peripheral side or the outer peripheral side of one end of the cylindrical filter, and the valve seat member When the valve seat member and the valve guide member are press-fitted into each other while the other end of the filter is brought into contact with the receiving surface formed on the other side of the valve guide member, the taper surface becomes one end inner peripheral side or outer periphery of the filter. Since the filter is in close contact with the corner of the side and the other end of the filter is in close contact with the receiving surface, the filter is in close contact with the valve seat member and the valve guide member with a simple configuration that does not require high dimensional accuracy. In this way, foreign matter can be prevented from flowing into the valve chamber. In addition, a filter formed into a cylindrical shape by sintering metal beads has a certain degree of strength while enabling deformation. By using such a filter, the filter is closely attached to the valve seat member and the valve guide member. The structure to be made can be configured easily.

  According to the second feature of the present invention, a tapered surface is formed on one of the inner periphery and the outer periphery of the annular protrusion provided on one of the valve seat member and the valve guide member, and the inner periphery and the outer periphery of the annular protrusion. A press-fitting surface is formed on the other of the two, and the annular projecting portion serves as a function of closely attaching the valve seat member and the valve guide member to one filter and a press-fitting function of the valve seat member and the valve guide member to the other. Thus, the pressure reducing valve can be reduced in size.

  According to the third feature of the present invention, the metal surface that may be generated by being crushed by the taper surface by bringing the taper surface into close contact with the corner portion on the outer periphery side of the filter that defines the outer periphery of the valve chamber. It is possible to prevent the powder from entering the valve chamber and reliably prevent the metal chips from being caught between the valve body and the valve seat.

  Furthermore, according to the fourth feature of the present invention, the annular seal member mounted in the first mounting hole so as to be in sliding contact with the outer periphery of the valve body or the valve shaft coaxially connected to the valve body. A seal holding member that prevents the filter from coming out forms a receiving surface that contacts the other end of the filter and is fitted into the second mounting hole, and the seal holding member is formed between the second mounting hole and the first mounting hole. Therefore, it is not necessary to press-fit the seal holding member that is normally press-fitted into the second mounting hole.

It is a longitudinal cross-sectional view of a pressure reducing valve. FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, in FIG. 1, the pressure reducing valve decompresses compressed natural gas, which is a fuel gas, to an engine (not shown). A body 11 made of metal and a diaphragm cover 12 coupled to the body 11 are provided. The body 11 houses a valve mechanism 13 and a relief valve 14. The

  The body 11 is basically formed in a cylindrical shape having an inward flange 15 projecting radially inward at an intermediate portion in the vertical direction, and is disposed above the inward flange 15. A sliding hole 16 and a receiving hole 17 disposed below the inward flange 15 are provided coaxially in the body 11.

  The housing hole 17 has a small-diameter hole 17a, a screw hole 17b having a larger diameter than the small-diameter hole 17a, and a large-diameter hole 17c having a larger diameter than the screw hole 17b in order from the inward flange 15 side. The lower end of the large-diameter hole 17c is opened downward at the lower end surface of the body 11.

  An inlet-side connection hole 18 for introducing compressed natural gas before decompression is provided on the side surface of the body 11, and a high-pressure passage 19 connected to the inlet-side connection hole 18 is provided in the body 11.

  Referring also to FIG. 2, the valve mechanism 13 is driven by a diaphragm 20, and is a metal valve guide member 22 that is airtightly fitted and fixed to the small diameter hole 17 a of the accommodation hole 17; A metal valve seat member 23 having a valve seat 27 having a valve hole 26 opened in the center thereof and coupled to the valve guide member 22, and the valve guide member being able to be seated on the valve seat 27 And a high pressure LPG that flows between the valve seat 24 made of synthetic resin and the valve seat member 23 and the valve guide member 22 and accommodates at least a part of the valve body 24. And a filter 25 for filtering fuel.

  The filter 25 is formed in a cylindrical shape by sintering metal beads such as brass beads. One of the valve seat member 23 and the valve guide member 22, in this embodiment, the valve seat member 23, and the tapered surface 29 is in contact with the corner portion 34 on one end inner peripheral side or outer peripheral side of the filter 25. And the other end of the filter 25 is brought into contact with the other side of the valve seat member 23 and the valve guide member 22, in this embodiment, the valve guide member 22 side. A surface 30 is formed.

  The valve seat member 23 is provided with an annular protrusion 31 that protrudes toward the valve guide member 22, and an outer diameter larger than the outer diameter of the annular protrusion 31 is provided at one end outer periphery of the valve guide member 22. A cylindrical portion 32 having the same shape as that of the annular protrusion 31 is integrally provided. Thus, the tapered surface 29 is formed on one of the inner periphery and the outer periphery of the annular protrusion 31, and the valve seat member 23 and the valve guide member 22 are formed on the other of the inner periphery and the outer periphery of the annular protrusion 31. In this embodiment, an annular protrusion of the valve seat member 23 is defined so as to define the outer periphery of the valve chamber 28 where the valve seat 27 faces. 31 and the filter 25 is disposed inward of the cylindrical portion 32 of the valve guide member 22, and the tapered surface 29 that is in close contact with the corner portion 34 on the outer peripheral end of the filter 25 increases toward the filter 25 side. A press-fitting surface 33 that is formed on the inner periphery of the annular protrusion 31 so as to have a diameter and is press-fitted into the tip of the cylindrical portion 32 is formed on the outer periphery of the annular protrusion 31.

  A valve shaft 35 that loosely penetrates the valve hole 26 and coaxially penetrates the valve body 24 is coaxially connected to the valve body 24, and the valve guide member 22 includes a valve body 24 and a valve shaft 35. At least one of the valve body 24 and the valve shaft 35 is slidably fitted in this embodiment.

  The valve shaft 35 includes a valve body mounting shaft portion 35a, a connecting shaft portion 35b formed in a smaller diameter than the valve body mounting shaft portion 35a and coaxially connected to one end of the valve body mounting shaft portion 35a, and the valve body mounting. A guide shaft portion 35c that is formed to be slightly larger in diameter than the shaft portion 35a and is coaxially connected to the other end of the valve body mounting shaft portion 35a is integrally formed, and the connecting shaft portion 35b loosely penetrates the valve hole 26. And connected to the diaphragm 20 side.

  The valve body 24 is formed in a cylindrical shape so as to be mounted and fixed on the outer periphery of the valve body mounting shaft portion 35a of the valve shaft 35, and is seated on the valve seat 27 at one end of the valve body 24. A possible tapered sealing surface 36 is formed, and an annular engagement protrusion 37 that elastically engages with an annular locking groove 38 provided on the outer periphery of one end of the valve body mounting shaft portion 35a protrudes. Established. Further, a flange 35d for receiving the other end of the valve body 24 is integrally formed on the outer periphery of the connecting portion of the valve body mounting shaft portion 35a and the guide shaft portion 35c in the valve shaft 35 so as to project outward in the radial direction. Provided.

  The valve guide member 22 is formed with a first mounting hole 40 and a diameter larger than that of the first mounting hole 40, is coaxially connected to one end of the first mounting hole 40, and opens to the valve chamber 28 side. A second mounting hole 41, an insertion hole 42 formed with a smaller diameter than the first mounting hole 40 and having one end coaxially connected to the other end of the first mounting hole 40, and a smaller diameter than the insertion hole 42 A guide hole 43 having one end coaxially connected to the other end of the insertion hole 42 is provided coaxially, and a guide shaft portion 35 c of the valve shaft 35 is slidably fitted in the guide hole 43.

  The first mounting hole 40 is mounted with an annular first seal member 44 that elastically slides on the outer periphery of the valve body 24 or the valve shaft 35. Thus, in this embodiment, the sealing surface 36 is formed at one end and the other end of the valve body 24 where the engaging protrusion 37 is protruded is the second mounting hole 41 and the first mounting hole. 40, the guide shaft portion 35c of the valve shaft 35 is slidably fitted in the guide hole 43, and the valve body is inserted into the first mounting hole 40. The first seal member 44 that is elastically slidably contacted with the outer periphery of the ring 24 sandwiches the backup ring 46 between the insertion hole 42 and the annular first step portion 45 formed between the first mounting hole 40. The first mounting hole 40 is mounted.

  The backup ring 46 and the first seal member 44 are provided between the second mounting hole 41 and the first step portion 45 so as to prevent the first seal member 44 from coming out of the first mounting hole 40. A ring-shaped seal holding member 47 sandwiched between the first mounting hole 40 and the second mounting hole 41 is fitted so as to be in contact with the annular second step portion 48, and this seal holding member 47. The flat receiving surface 30 that closes the other end of the filter 25 is formed on the surface opposite to the second step portion 48.

  Thus, when the valve seat member 23 and the valve guide member 22 are press-fitted, the tapered surface 29 on the inner periphery of the annular protrusion 31 projecting from the valve seat member 23 is a corner portion on the outer peripheral side of one end of the filter 25. 34 is squeezed into close contact with the corner portion 34, and the other end of the filter 25 is sandwiched between the second step portion 48 and the seal holding member 47 so as to sandwich the seal holding member 47. Close to the receiving surface 30.

  The valve guide member 22 is configured so that an annular second seal member 49 mounted on a surface of the valve seat member 23 facing the inward flange 15 is brought into contact with the inward flange 15, An annular third seal member 50 that is fitted and fixed to the 17 small-diameter holes 17 a and elastically contacts the inner periphery of the small-diameter hole 17 a is attached to the outer periphery of the valve guide member 22. Thus, between the outer periphery of the valve seat member 23 and the outer periphery of the valve guide member 22 on the valve seat member 23 side, and the inner periphery of the small-diameter hole 17a in the accommodation hole 17, an annular shape communicating with the high-pressure passage 19 The cylindrical portion 32 is provided with a plurality of communication holes 52 communicating with the high pressure chamber 51 outside the filter 25.

  In FIG. 1 again, the screw hole 17b of the accommodation hole 17 is a ring-shaped presser that abuts the valve guide member 22 and clamps the valve guide member 22 and the valve seat member 23 between the inward flange 15. A member 54 is screwed, and a tool (not shown) for rotating the pressing member 54 to be screwed into the screw hole 17b is provided on the end surface of the pressing member 54 opposite to the valve mechanism 13. A bottomed engagement hole 55 is provided for releasably engaging.

  The opening end of the accommodation hole 17 is hermetically closed by the adjustment member 56. The adjustment member 56 has a large-diameter portion that is fitted on the large-diameter hole 17c by attaching an annular fourth seal member 57 that elastically contacts the inner surface of the large-diameter hole 17c in the accommodation hole 17 to the outer periphery. 56a and a male screw 58 that is formed to have a smaller diameter than the large-diameter portion 56a and that engages with the screw hole 17b of the receiving hole 17, and is coaxially and integrally formed with the large-diameter portion 56a. And a small-diameter portion 56b that is continuous with the large-diameter portion 56a. The large-diameter portion 56a is provided with a bottomed tool engagement hole 59 that can engage a tool (not shown). Thus, when the male screw 58 is screwed into the screw hole 17b and the tool is engaged with the tool engagement hole 59 and rotated, the adjustment member 56 moves along the axis coaxial with the valve shaft 35. It is possible to move forward and backward.

  The adjusting member 56 is provided with a bottomed recess 60 opened to the valve shaft 35 side so as to be coaxial with the valve shaft 35, and a spring receiving member attached to the end of the guide shaft portion 35c of the valve shaft 35. A back coil spring 62 is contracted between 61 and the closed end of the recess 60. Thus, by adjusting the forward / backward position along the axial direction of the adjusting member 56 by rotating the adjusting member 56, the spring load of the back coil spring 62 can be adjusted.

  A flange portion 11 a projecting sideways is integrally provided on the outer periphery of one end of the body 11, and a peripheral portion of the diaphragm 20 is formed by the flange portion 11 a and a diaphragm cover 12 fixed to the body 11. Sandwiched between. That is, the diaphragm cover 12 is integrally formed with a bottomed cylindrical portion 12b having an end wall 12a at one end and a flange portion 12c projecting radially outward from the other end of the bottomed cylindrical portion 12b, and is formed of a thin metal plate. The outer periphery of the flange portion 12 c of the diaphragm cover 12 that sandwiches the peripheral edge portion of the diaphragm 20 between the flange portion 11 a of the body 11 is caulked so as to engage with the flange portion 11 a of the body 11.

  A pressure acting chamber 63 is formed between the body member 11 and the diaphragm 20 so as to face one surface of the diaphragm 20, and a spring chamber 64 is formed between the diaphragm 20 and the diaphragm cover 12 so as to face the other surface of the diaphragm 20. Then, a coiled diaphragm spring 65 accommodated in the spring chamber 64 is contracted between the diaphragm cover 12 and the diaphragm 20.

  Further, a negative pressure introducing pipe 66 communicating with the spring chamber 64 is connected to the end wall 12a of the diaphragm cover 12, and the negative pressure introducing pipe 66 is connected to the engine. Is introduced.

  A first retainer 67 is brought into contact with one surface of the diaphragm 20 on the pressure acting chamber 63 side, and a second retainer 68 sandwiching the inner peripheral edge of the diaphragm 20 between the first retainer 67 and the spring chamber 64. It is brought into contact with the central part of the diaphragm 20 on the side.

  A metal diaphragm rod 69 is linked and connected to the valve body 24 of the valve mechanism 13. The diaphragm rod 69 integrally includes a large-diameter sliding portion 69a that is slidably fitted into the sliding hole 16 of the body 11, and a small-diameter shaft portion 69b that is coaxially connected to the large-diameter sliding portion 69a. An annular fifth seal member 70 that elastically slides on the inner periphery of the sliding hole 16 is attached to the outer periphery of the large-diameter sliding portion 69a.

  The small-diameter shaft portion 69b of the diaphragm rod 69 passes through the first retainer 67, the diaphragm 20, and the second retainer 68 with an annular sixth seal member 71 interposed between the first retainer 67 and the first retainer 67. By caulking the outer periphery of the end portion of the small-diameter shaft portion 69b on the spring chamber 64 side, the inner peripheral edge portion of the diaphragm 20 is sandwiched between the first and second retainers 67 and 68, and the second retainer 68 is provided with a diaphragm spring 65. The end is abutted.

  A holding plate 72 formed in a substantially U shape is engaged and held at one end portion of a connecting shaft portion 35 b of the valve shaft 35 coaxially provided to the valve body 24 of the valve mechanism 13. A substantially C-shaped engagement ring 73 mounted on the outer periphery of the diaphragm rod engages with the inner periphery of the recess 74 provided in the large-diameter sliding portion 69a of the diaphragm rod 69, thereby connecting the shaft portion 35b, that is, the valve. The shaft 35 is linked and connected to a diaphragm rod 69 fixed to the center portion of the diaphragm 20.

  A decompression chamber 75 having a circular shape coaxial with the valve hole 26 is formed between the large-diameter sliding portion 69 a and the valve mechanism 13 in the sliding hole 16 so as to communicate with the valve hole 26. The body 19 has an outlet passage 76 that communicates with the decompression chamber 75 and a connection hole 77 that has a larger diameter than the outlet passage 76 and that communicates with the outlet passage 76 so as to extend in the radial direction of the decompression chamber 38. The outlet-side connection pipe 79, which is provided coaxially and has an annular seventh seal member 78 attached elastically to the inner periphery of the connection hole 77, is connected to the outlet passage 76. The connection hole 77 is fitted and fixed. Further, the body 11 is provided with a communication passage 80 that allows the outlet passage 76 to communicate with the pressure action chamber 63, and the pressure of the outlet passage 76, that is, the decompression chamber 75 acts on the pressure action chamber 63.

  By the way, a back pressure chamber 82 is formed in the accommodation hole 17 whose opening end is hermetically closed by the adjusting member 56 so that the end of the guide shaft portion 35c of the valve shaft 35 faces. The chamber 82 communicates with the decompression chamber 75 through a back pressure introduction path 83. Thus, the back pressure introduction path 83 includes the first passage portion 84 formed between the valve hole 26, the valve body mounting shaft portion 35a of the valve body 24 and the valve shaft 35, the first passage portion 84, and the back portion. It consists of a guide shaft portion 35c of the valve shaft 35 and a second passage portion 85 formed between the valve guide members 22 so as to connect the pressure chambers 82. Thus, the first and second passage portions 84 and 85 have grooves 86 formed on the outer periphery of the valve shaft 35 from one end of the valve body mounting shaft portion 35a to the middle portion of the guide shaft portion 35c. The valve body 42 and the valve guide member 22 are formed.

  Referring to FIG. 1, the relief valve 14 opens as the pressure in the decompression chamber 75 becomes equal to or higher than a set pressure. The relief valve 14 has an end wall 87a at the outer end and has a bottomed cylinder. And a valve housing 87 fitted and fixed to the body 11 with an axial line extending in the radial direction of the decompression chamber 75, and a relief valve slidably fitted to the valve housing 87 A body 88 and a coil spring 89 provided between the relief valve body 88 and the end wall 87a of the valve housing 87.

  A fitting hole 90 for fitting and fixing the inner end portion of the valve housing 87 to the body 11 and a relief valve hole 91 that opens to the central portion of the inner end of the mounting hole 90 through the decompression chamber 75. Are provided so as to be coaxially connected along the radial direction of the decompression chamber 75, and an annular relief valve seat having the relief valve hole 91 opened in the center at the inner end of the mounting hole 90. 92 is formed.

  On the other hand, the relief valve body 88 is formed in a bottomed cylindrical shape with the decompression chamber 75 side as a closed end, and a seal member 93 made of, for example, rubber is seated on the relief valve seat 92 to form a relief valve hole. 91 can be closed, and is attached to the outer surface of the inner end closing portion of the relief valve body 88. The relief valve body 88 has a release passage 94 that communicates with the decompression chamber 75 through the relief valve hole 91 in a state where the seat member 93 is separated from the relief valve seat 92. 94 opens at the outer end of the relief valve 88. A seal member 93 of the relief valve 88 is separated from the relief valve seat 92 when the pressure in the decompression chamber 75 becomes a predetermined pressure or more at the central portion of the end wall 87a at the outer end of the valve housing 87. Thus, a release hole 95 is provided for releasing the pressure of the decompression chamber 75 to the outside in response to the release passage 94 communicating with the relief valve hole 92.

  In such a gas pressure reducing valve, when the diaphragm 20 is bent toward the spring chamber 64 against the spring force of the diaphragm spring 65 due to the pressure of the pressure acting chamber 63, the valve mechanism 13 is closed and the pressure is reduced. When the diaphragm 20 is bent toward the pressure working chamber 63 due to the pressure drop in the working chamber 63, the valve mechanism 13 is opened, and the opening and closing of the valve mechanism 13 is repeated, whereby the high-pressure compressed natural gas is decompressed. Output from the outlet side connecting pipe 79.

  Next, the operation of this embodiment will be described. The filter 25 is formed into a cylindrical shape by sintering metal beads, and one of the valve seat member 23 and the valve guide member 22 is provided on one inner peripheral side or outer peripheral side of the filter 25. A tapered surface 29 that contacts the corner 34 is formed coaxially with the filter 25, and a receiving surface 30 that contacts the other end of the filter 25 is formed on the other side of the valve seat member 23 and the valve guide member 22. When the member 23 and the valve guide member 22 are press-fitted, the taper surface 29 is brought into close contact with the corner portion 34 so as to crush the corner portion 34 and the other end of the filter 25 is brought into close contact with the receiving surface 30. The filter 25 can be brought into close contact with the valve seat member 23 and the valve guide member 22 with a simple configuration that does not require accuracy, thereby preventing foreign matter from flowing into the valve chamber 28. That. In addition, the filter 25 formed into a cylindrical shape by sintering the metal beads has a certain degree of strength while enabling deformation. By using such a filter 25, the filter 25 can be used as the valve seat member 23 and the valve. A structure to be brought into close contact with the guide member 22 can be easily configured.

  In addition, an annular protrusion 31 that protrudes toward the other side of the valve seat member 23 and the valve guide member 23 is provided on one of the valve seat member 23 and the valve guide member 22. The tapered surface 29 is formed on one side, and the press-fitting surface 33 that is press-fitted into the other of the valve seat member 23 and the valve guide member 22 is formed on the other of the inner periphery and the outer periphery of the annular protrusion 31. The annular protrusion 31 serves also as a function of tightly attaching the valve 23 and the valve guide member 22 to one filter 25 and a function of press-fitting the valve seat member 23 and the valve guide member 22 to the other, thereby contributing to downsizing of the pressure reducing valve. be able to.

  In addition, since the tapered surface 29 that becomes larger in diameter toward the filter 25 side is in close contact with the corner portion 34 on one end outer peripheral side of the filter 25 that defines the outer periphery of the valve chamber 28, It is possible to prevent metal chips that may be generated from entering the valve chamber 28 side and reliably prevent the metal chips from being caught between the valve body 24 and the valve seat 27.

  Further, a taper surface 29 is formed on the valve seat member 23, and the valve body 24 or the valve guide member 22 for slidably fitting at least one of the valve body 24 and the valve shaft 35 (both in this embodiment) to the valve body 24 or A first mounting hole 40 for mounting an annular first seal member 44 that elastically slides on the outer periphery of the valve shaft 35 (in this embodiment, the outer periphery of the valve body 24); A second mounting hole 41 formed in a large diameter and coaxially connected to one end of the first mounting hole 40 and opened to the valve chamber 28 side mutually connects the annular second stepped portion 48 facing the valve chamber 28 side. A ring-shaped seal holding member 47 which is provided coaxially so as to be formed therebetween and forms the receiving surface 30 with which the other end of the filter 25 abuts is formed from the first mounting hole 40 of the first seal member 44. To prevent the exit of Since the second holding hole 41 is fitted into the second mounting hole 41 while being in contact with the stepped part 48, the seal holding member 47 includes a second stepped part 48 formed between the second mounting hole 41 and the first mounting hole 40, and a filter. Thus, the press-fitting work of the seal holding member 47 that is normally press-fitted into the second mounting hole 41 is not necessary.

  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.

22 ... Valve guide member 23 ... Valve seat member 24 ... Valve body 25 ... Filter 26 ... Valve hole 27 ... Valve seat 28 ... Valve chamber 29 ... Tapered surface 30 ... Receiving surface 31 ... annular protrusion 33 ... press-fit surface 34 ... corner portion 35 ... valve shaft 40 ... first mounting hole 41 ... second mounting hole 44 ... First seal member 47 as a seal member ... Seal holding member 48 ... Second step as a step

Claims (4)

  A valve seat member (23) having a valve seat (27) with a valve hole (26) opened in the center, a valve guide member (22) coupled to the valve seat member (23), and the valve seat ( 27), and is formed between the valve seat member (23) and the valve guide member (22), and is formed between the valve seat member (23) and the valve guide member (22). A cylindrical filter (25) for filtering high-pressure LPG fuel flowing into the valve chamber (28) in which at least a part of (24) is accommodated, and the valve seat member (23) and the valve guide member (22) In the pressure reducing valve in which the filter (25) is assembled between the valve seat member (23) and the valve guide member (22), the filter (25) is cylindrical by sintering metal beads. Formed in the shape of the valve seat One of the valve guide member (22) and the valve guide member (22) has a tapered surface (29) that abuts the corner (34) on the inner peripheral side or outer peripheral side of one end of the filter (25) coaxially with the filter (25). A receiving surface (30) for contacting the other end of the filter (25) is formed on the other side of the valve seat member (23) and the valve guide member (22), and the valve seat member (23) When the valve guide member (22) is press-fitted, the corner portion (34) is crushed so that the tapered surface (29) is in close contact with the corner portion (34) and the filter is applied to the receiving surface (30). A pressure reducing valve characterized by bringing the other end of (25) into close contact.   An annular protrusion (31) protruding toward the other side of the valve seat member (23) and the valve guide member (22) is integrated with one of the valve seat member (23) and the valve guide member (22). The tapered surface (29) is formed on one of the inner periphery and the outer periphery of the annular protrusion (31), and the valve seat member ( 23. The pressure reducing valve according to claim 1, further comprising a press-fitting surface (33) for press-fitting into the other of the valve guide member (23) and the valve guide member (22).   The tapered surface (29), which becomes larger in diameter toward the filter (25), is in close contact with a corner (34) on the outer peripheral side of one end of the filter (25) that defines the outer periphery of the valve chamber (28). The pressure reducing valve according to claim 1 or 2, wherein the pressure reducing valve is formed on one of the valve seat member (23) and the valve guide member (22).   The tapered surface (29) is formed on the valve seat member (23) so that at least one of the valve body (24) and the valve shaft (35) coaxially connected to the valve body (24) can slide. A first mounting hole (40) for mounting an annular seal member (44) that elastically slides on the outer periphery of the valve body (24) or the valve shaft (35) to the valve guide member (22) to be fitted. ) And a second mounting hole (41) that has a larger diameter than the first mounting hole (40) and that is coaxially connected to one end of the first mounting hole 40 and that opens to the valve chamber (28) side, An annular stepped portion (48) facing the valve chamber (28) side is formed coaxially, and the receiving surface (30) for contacting the other end of the filter (25) is formed. A ring-shaped seal holding member (47) that performs the first mounting of the seal member (44). 4. The fitting according to claim 1, wherein the second mounting hole is fitted into the second mounting hole while being in contact with the stepped portion so as to prevent escape from the hole. Pressure reducing valve.

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