JP4021043B2 - Solenoid device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coil assembly formed by covering a bobbin and a coil wound around the bobbin with a covering portion made of a synthetic resin, and a guide cylinder made of a nonmagnetic material that is inserted into the bobbin and fixed to the body. A fixed core that is fixed to the guide cylinder by closing one end of the guide cylinder, a plunger that is slidably fitted to the guide cylinder opposite the fixed core, and a cylindrical portion that surrounds the coil assembly And a magnetic metal solenoid housing having an end plate portion connected to one end of the cylindrical portion and fastened to the fixed core, the coupler portion protruding outward from the notch provided in the cylindrical portion The present invention relates to a solenoid device formed integrally with a covering portion.
[0002]
[Prior art]
Conventionally, such a solenoid device is already known, for example, from JP-A-8-135513.
[0003]
[Problems to be solved by the invention]
In the above-described conventional solenoid device, a bolt that penetrates the central portion of the end plate portion of the solenoid housing is screwed into the fixed core, and the position of the coupler portion along the circumferential direction of the solenoid housing is determined when the bolt is tightened. However, when an external force is applied to the solenoid housing, the solenoid housing may rotate around the axis of the bolt, and when the solenoid housing is rotated, the circumferential position of the coupler portion is shifted from the normal position. Therefore, an undesired external force may act on the conducting wire connected to the coupler unit.
[0004]
In order to prevent such rotation of the solenoid housing, it is conceivable to increase the tightening force of the bolts. However, if this is done, the end plate and the fixed core of the solenoid housing will be enlarged, or a high-strength material will be used. It is necessary to form the end plate portion and the fixed core using the material, which is disadvantageous in terms of arrangement space and manufacturing cost.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a solenoid device capable of preventing rotation of the solenoid housing with a simple structure.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a coil assembly in which a bobbin and a coil wound around the bobbin are covered with a covering portion made of a synthetic resin, and is inserted into the bobbin and fixed to the body. A guide cylinder made of a non-magnetic material, a fixed core that closes one end of the guide cylinder and is fixed to the guide cylinder, a plunger that is slidably fitted to the guide cylinder facing the fixed core, and A magnetic metal solenoid housing having a cylindrical portion surrounding the coil assembly and an end plate portion connected to one end of the cylindrical portion and fastened to the fixed core; and from a notch provided in the cylindrical portion in the solenoid device coupler portion protruding outside is formed integrally with the cover portion, the flange portion in the body overhangs on one side of the cylindrical portion is integrally provided with the cylindrical portion of the flange portion Surface of the a restricting wall, engaging claw to prevent rotation of the solenoid housing in contact with the restricting wall, characterized in that it is projected from the other end of the cylindrical portion.
[0007]
According to the above configuration, even if the solenoid housing attempts to rotate around the fastening portion of the end plate portion to the fixed core, the engaging claw protruding from the other end of the cylindrical portion is provided integrally with the body. The rotation of the solenoid housing is prevented with a simple structure that does not require an increase in tightening strength because the rotation is prevented by engaging a restriction wall provided on the cylindrical portion side of the flange portion. Can be blocked. Moreover, since the restriction wall is a surface of the flange portion provided on the body on the cylindrical portion side, it is not necessary to form a restriction wall specially.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0009]
1 to 15 show an embodiment of the present invention. FIG. 1 is a diagram schematically showing the configuration of a fuel supply device for a vehicle, FIG. 2 is a side view of the regulator, and FIG. 3 is a plan view of the regulator. 4 is a sectional view taken along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, FIG. 6 is an enlarged longitudinal sectional view of the electromagnetic shut-off valve, and FIG. 8 is an enlarged longitudinal sectional view of the primary pressure reducing valve, FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 8, FIG. 10 is an enlarged view of the main part of FIG. FIG. 12 is a diagram showing hysteresis characteristics depending on the number of O-rings attached to the piston, FIG. 13 is an enlarged longitudinal sectional view of a secondary pressure reducing valve, and FIG. 14 is a sectional view taken along line 14-14 of FIG. FIGS. 15A and 15B are vertical side views of the cap taken along the line 15-15 in FIG.
[0010]
First, in FIG. 1, compressed natural gas (hereinafter referred to as CNG) is stored in one or a plurality of CNG tanks 20 at a high pressure of, for example, 250 to 10 kg / cm ^2. Are respectively connected to the filling port 22 via a check valve 23 and are connected in common to the manual shut-off valve 24. Each of the container shut-off valves 21 ... and the manual shut-off valve 24 is provided. A pressure sensor 26 and a temperature sensor 27 are attached to the intermediate pipe line 25.
[0011]
CNG from the CNG tank 20 when the container shut-off valve 21 and the manual shut-off valve 24 are opened is an oil filter for removing oil that may be mixed when the CNG tank 20 is filled with CNG by the compressor. The CNG led to the regulator R through the pipe line 28 including 41 and decompressed to ² to 3 kg / cm ² by the regulator R is led to the injector 29 of the engine E through the pipe line 30. Thus, a temperature sensor 31 and a pressure sensor 32 are attached to the pipe line 30.
[0012]
2 to 5, the regulator R is connected to a common body 34 having a hot water passage 33, a filter 35, an electromagnetic shut-off valve 36, a primary pressure reducing valve 37, a secondary pressure reducing valve 38, a relief valve 39, and A thermostat 40 is provided.
[0013]
The filter 35 removes impurities contained in CNG guided from the manual shut-off valve 24 via the pipe line 28. The electromagnetic shut-off valve 36 is connected to the filter 35 and the primary pressure reducing valve when the engine E is stopped. It acts to stop the supply of CNG by blocking 37.
[0014]
The primary pressure-reducing valve 37 operates so as to depressurize 250 to 10 kg / cm ² of high-pressure CNG from the CNG tank 20 to, for example, 6 to 7 kg / cm ² , and the secondary pressure-reducing valve 38 has a primary pressure-reducing valve 37. CNG operates so as to reduce the pressure of the example to 2-3 kg / cm ² from, CNG from the secondary pressure-reducing valve 38 is led to the injector 29 via line 30.
[0015]
The relief valve 39 is connected between the primary pressure reducing valve 37 and the secondary pressure reducing valve 38, and a CNG decompressed by the primary pressure reducing valve 37 and guided to the secondary pressure reducing valve 38 is, for example, a preset valve opening. When the pressure rises above, for example, 16.5 kg / cm ² , the valve opens to release CNG into the atmosphere.
[0016]
Further, engine cooling water is introduced into the hot water passage 33 of the body 34 from the engine E so that the temperature of the body 34 does not drop too much due to the pressure reducing action of the primary and secondary pressure reducing valves 37 and 38. However, the thermostat 40 is disposed in the body 34 on the return side of the engine cooling water from the hot water passage 33 to the engine E side, and the engine cooling water flowing through the hot water passage 33 exceeds, for example, 80 degrees. The valve 34 is sometimes closed so that the temperature of the body 34 does not rise too much.
[0017]
Hereinafter, the configurations and operations of the filter 35, the electromagnetic shut-off valve 36, the primary pressure reducing valve 37, the secondary pressure reducing valve 38, the relief valve 39, and the thermostat 40 will be sequentially described.
[0018]
[Filter 35]; Paying particular attention to FIG. 5, a concave portion 43 is provided on a side portion of the body 34 in the middle portion in the vertical direction, and a pipe joint 44 is connected to the inner end of the outer end opening of the concave portion 43. An annular seal member 45 is screwed between the body 34 and a pipe 28 that guides CNG from the manual shut-off valve 24 is connected to the outer end of the pipe joint 44. A filter 35 is fitted in the recess 43 so as to be spaced from the inner end of the pipe joint 44, and the filter 35 is interposed between the filter 35 and the pipe joint 44. A spring 46 is provided that exerts a resilient force that presses against the inner end blocking portion.
[0019]
An annular unpurified chamber 47 communicating with the inside of the pipe joint 44 is formed between the outer periphery of the filter 35 fitted in the recess 43 and the body 34, and the purifying chamber 48 in the filter 35 is formed in the body 34. A passage 49 leading to is provided. Thus, impurities contained in CNG guided through the pipe line 28 pass through the filter 35 from the unpurified chamber 47 and flow into the purifying chamber 48, and are further guided to the passage 49.
[0020]
[Electromagnetic shut-off valve]; Referring also to FIG. 6, the side of the body 34 is electromagnetically moved to a vertical position corresponding to the filter 35 at a position spaced from the screwed position of the pipe joint 44 in the circumferential direction. A shut-off valve 36 is attached.
[0021]
The electromagnetic shut-off valve 36 includes a coil assembly 50, a guide cylinder 51 made of a non-magnetic material whose one end is inserted into the coil assembly 50 and the other end is fixed to the body 34, and one end of the guide cylinder 51. A fixed core 52 fixed to the guide cylinder 51 so as to cover the plunger, a plunger 53 slidably fitted into the guide cylinder 51 facing the fixed core 52, and provided between the fixed core 52 and the plunger 53. The return spring 54, the magnetic metal solenoid housing 55 fastened to the fixed core 52 so as to cover the coil assembly 50, and the coil assembly 50 screwed into the body 34 so as to be sandwiched between the solenoid housing 55. And a valve member 57 held by the plunger 53 on the side opposite to the fixed core 52.
[0022]
The coil assembly 50 is formed by covering a synthetic resin bobbin 59 having a central hole 58 and a coil 60 wound around the bobbin 59 with a covering portion 61 made of synthetic resin. A coupler portion 61a facing the pair of connection terminals 62 connected to the coil 60 is integrally provided on the body 34 side portion so as to protrude outward, and this coupler portion 61a is not shown. Conductor is connected.
[0023]
The body 34 has a small-diameter hole 63 whose inner end is closed, and a large-diameter hole 64 having a diameter larger than that of the small-diameter hole 63 and coaxially connected to the outer end of the small-diameter hole 63. Are formed between each other. On the outer surface on the other end side of the guide tube 51 in which one end side is inserted into the center hole 58 of the bobbin 59, a flange portion 51a that makes the outer peripheral surface approach and face the inner surface of the large-diameter hole 64 projects outward in the radial direction. The other end portion of the guide tube 51 is inserted into the large-diameter hole 64 so that the annular seal member 66 is sandwiched between the flange portion 51a and the step portion 65.
[0024]
The magnetic support frame 56 surrounds a portion of the guide tube 51 that protrudes from the coil assembly 50 toward the body 34 and contacts the end surface of the coil assembly 50 on the body 34 side, and the ring plate portion 56a. And a cylindrical portion 56b that is integrally provided on the inner periphery and surrounds the guide cylinder 51. The magnetic support frame 56 is assembled to the body 34 by screwing the cylindrical portion 56b into the large-diameter hole 64. . In addition, the guide tube 51 is also fixed to the body 34 by sandwiching the seal member 66 and the flange portion 51a between the tips of the step portion 65 and the cylindrical portion 56b.
[0025]
The fixed core 52 is formed of a magnetic metal in a rod shape having a circular cross section, and the outer end protrudes from one end of the guide tube 51 and the inner end is fitted to one end of the guide tube 51. It is fixed to the guide tube 51 by welding or the like. At this time, since the flange portion 51a protruding outward in the radial direction is provided on the other end side of the guide tube 51, the magnetic support frame 56 and the coil assembly 50 are attached to the guide tube 51. In order to avoid the fixed portion of the guide tube 51 and the fixed core 52 from protruding from the outer surface of the guide tube 51, it is necessary to perform from one end side of the 51, that is, the fixed core 52 side. The outer diameter of the protruding portion is set smaller than the outer diameter of the guide tube 51. Therefore, an annular gap 67 is formed between the inner surface on one end side of the center hole 58 in the coil assembly 50 and the outer peripheral surface of the fixed core 52. Further, the outer end surface of the fixed core 52 is disposed at substantially the same position as the one end surface of the coil assembly 50 along the axis of the guide tube 51.
[0026]
The solenoid housing 55 is integrally formed with a cylindrical portion 55a that surrounds the coil assembly 50 and an end plate portion 55b that is connected to one end of the cylindrical portion 55a, and is formed into a bottomed cylindrical shape. The central portion of the end plate portion 55b is brought into contact with the outer end surface of the fixed core 52. In addition, the fixed core 52 is provided with a screw shaft portion 52a projecting outward from the outer end surface thereof coaxially and integrally, and is inserted through the center of the end plate portion 55b to allow the screw shaft portion 52a to be inserted therethrough. A hole 68 is provided. Thus, a cap nut 70 is screwed into the protruding portion of the screw shaft portion 52a from the end plate portion 55b with a washer 69 interposed between the cap nut 70 and the outer surface of the end plate portion 55b. As a result, the end plate portion 55b, that is, the central portion of the closed end of the solenoid housing 55 is fastened to the fixed core 52.
[0027]
By fastening the solenoid housing 55 to the fixed core 52, the coil assembly 50 is sandwiched between the end plate portion 55 b of the solenoid housing 55 and the ring plate portion 56 a of the magnetic support frame 56. In order to prevent an excessive load from acting on the coil assembly 50 due to the fastening of the housing 55, an annular elastic member 71 that elastically contacts the inner surface of the end plate portion 55b is provided on one end surface of the coil assembly 50. Is attached, and an annular elastic member 72 is sandwiched between the inner periphery of the other end of the coil assembly 50 and the magnetic support frame 56.
[0028]
A magnetic path forming member 73 made of magnetic metal is fixed to the inner surface of the end plate portion 55b in the solenoid housing 55 by spot welding or the like. The magnetic path forming member 73 has a ring plate portion 73a that surrounds the fixed core 52 and contacts the inner surface of the end plate portion 55b, and one end coaxially and integrally connected to the inner periphery of the ring plate portion 73a. A cylindrical portion 73b. The cylindrical portion 73 b surrounds the fixed core 52 by enabling magnetic coupling with the fixed core 52, and the other end of the cylindrical portion 73 b is formed between the coil assembly 50 and the fixed core 52. It is inserted into the annular gap 67.
[0029]
On the other end side of the cylindrical portion 55a in the solenoid housing 55, a notch 74 is provided for projecting the coupler portion 61a provided integrally with the covering portion 61 of the coil assembly 50 to the outside. By the way, a disc-like flange portion 77 for attaching the secondary pressure reducing valve 38 is integrally provided above the electromagnetic shut-off valve 36 so as to project outward, and this flange portion 77 is provided. The surface on the electromagnetic shut-off valve 36 side forms a flat regulating wall 76 that faces the other end side of the cylindrical portion 55 a of the solenoid housing 55 of the electromagnetic shut-off valve 36. On the other hand, the other end of the cylindrical portion 55 a is integrally provided with a pair of engaging claws 75, 75 protruding toward the regulating wall 76, and these engaging claws 75, 75 are formed on the regulating wall 76. By engaging, rotation of the solenoid housing 55 around the axis of the screw shaft portion 52a included in the fixed core 52 is prevented.
[0030]
By the way, the other end side of the guide cylinder 51 is fixed to the body 34 in a state of being inserted into the large diameter hole 64, and the plunger 53 is slidably fitted to the guide cylinder 51, so that the small diameter hole 63 of the body 34 is formed. A main valve chamber 78 is formed between the inner end blocking portion and the other ends of the guide cylinder 51 and the plunger 53. In addition, a passage 49 communicating with the purification chamber 48 of the filter 35 communicates with the main valve chamber 78, and CNG purified by the filter 35 is introduced into the main valve chamber 78.
[0031]
A passage 79 is provided in the body 34 so as to open at the center of the inner end blocking portion of the small diameter hole 63, and the main valve chamber 78 is formed so as to surround the opening end of the passage 79 to the main valve chamber 78. An annular valve seat 80 that protrudes slightly to the side is provided on the body 34.
[0032]
The valve member 57 has a tapered surface having a small diameter toward the plunger 53 side at one end surface and is opposed to the pilot valve portion 57a on one end side formed in a disk shape and the inner end blocking portion of the small diameter hole 63. A main valve portion 57b on the other end side formed in a disc shape is integrally connected via a connecting cylinder portion 57c forming a step between both valve portions 57a and 57b. The diameter of the part 57a is set smaller than the diameter of the main valve part 57b. A central portion of the valve member 57 is provided with a first passage 81 that always communicates with the passage 79 and a second passage 82 that communicates with the first passage 81 and opens at the center of one end surface of the pilot valve portion 57a. The second passage 82 is formed with a smaller diameter than the first passage 81.
[0033]
A concave portion 83 into which the pilot valve portion 57 a is inserted is provided at the end facing the main valve chamber 78 in the plunger 53, and the pilot valve portion 57 a is a C-shaped retaining ring 84 fixed to the other end of the plunger 53. Thus, a pilot valve chamber 85 is formed between the pilot valve portion 57a and the plunger 53 so as to be prevented from being detached from the recess 83, and communicates with the main valve chamber 78. Also, a rubber seal 86 that closes the opening of the second passage 82 to the pilot valve chamber 85 when the central portion of one end surface of the pilot valve portion 57 a is seated is embedded in the central portion of the closed end of the recess 83. Thus, the retaining ring 84 is fixed to the plunger 53 at a position where the pilot valve portion 57a can move in the axial direction relative to the plunger 53 between the closed end of the recess 83 and the retaining ring 84. .
[0034]
An annular rubber seal 87 is embedded in the surface of the main valve portion 57b that faces the closed end of the small-diameter hole 63 so as to be seated on the valve seat 80 and to block between the main valve chamber 78 and the passage 79.
[0035]
In such an electromagnetic shut-off valve 36, when the engine E is stopped, the plunger 53 moves in a direction away from the fixed core 52 by the spring force of the return spring 54 due to the demagnetization of the coil 60, and the rubber seal 87 of the main valve portion 57b is moved to the valve. The main valve chamber 78 and the passage 79 are blocked by being seated on the seat 80, and the pilot valve portion 57a is also seated on the rubber seal 86 and the space between the pilot valve chamber 85 and the passage 79 is also blocked. Supply to is stopped.
[0036]
On the other hand, when the coil 60 is energized at the start of operation of the engine E, the plunger 53 first moves to the fixed core 52 side only by moving the pilot valve portion 57a away from the rubber seal 86 and enters the passage 79 via the first passage 81. The communicating second passage 82 communicates with the pilot valve chamber 85. As a result, CNG gradually flows from the main valve chamber 78 to the passage 79 through the pilot valve chamber 85, the second passage 82, and the first passage 81, whereby the main valve chamber 78 and the passage 79 enter the main valve portion 57b. The difference in pressure acting from the side is reduced. Thus, when the electromagnetic force by the coil 60 overcomes the differential pressure acting on the main valve portion 57b, the plunger 53 further moves to the fixed core 52 side, and the rubber seal 87 of the main valve portion 57b is moved to the valve seat 80. The CNG flows away from the main valve chamber 78 to the passage 79.
[0037]
Moreover, in the electromagnetic shut-off valve 36, the central portion of the end plate portion 55b of the solenoid housing 55 is fastened to the fixed core 52, but the engaging claws 75, which are integrally provided on the cylindrical portion 55a of the solenoid housing 55, Since 75 engages with the restriction wall 76 of the body 34, even if the solenoid housing 55 tries to rotate around the fastening portion of the end plate portion 55b to the fixed core 52, the restriction walls of the engagement claws 75, 75 are used. The engagement with 76 prevents the solenoid housing 55 from rotating. Therefore, the rotation of the solenoid housing 55 can be prevented with a simple structure that does not require an increase in the tightening strength of the solenoid housing 55 to the fixed core 52, and the cutting provided in the cylindrical portion 55a of the solenoid housing 55 is prevented. The position in the circumferential direction of the coupler portion 61a protruding outward from the notch 74 is prevented from deviating from the normal position, and an undesired external force does not act on the conducting wire connected to the coupler portion 61a. Further, the restriction wall 76 is a surface of the disk-like flange portion 77 for attaching the secondary pressure reducing valve 38 to the body 34 on the electromagnetic shut-off valve 36 side, and it is not necessary to form the restriction wall 76 specially. The solenoid housing 55 can be arranged as close as possible to the center of the body 34, which can contribute to the downsizing of the regulator R.
[0038]
An annular gap 67 is formed between the outer surface of the fixed core 52 and the inner surface of the center hole 58 of the coil assembly 50. The ring abuts against the closed end of the solenoid housing 55, that is, the inner surface of the end plate portion 55b. A magnetic path forming member 73 including a plate portion 73a and a cylindrical portion 73b that is coaxially and integrally connected to the inner periphery of the ring plate portion 73a and surrounds the fixed core 52 so as to enable magnetic coupling. The other end of the cylindrical portion 73 b is fixed to the solenoid housing 55 so as to be inserted into the gap 67. By arranging such a magnetic path forming member 73 between the solenoid housing 55 and the fixed core 52, the magnetic path area between the solenoid housing 55 and the fixed core 52 is an area corresponding to the outer end surface of the fixed core 52. The area of the outer periphery of the fixed core 52 surrounded by the cylindrical portion 73b of the magnetic path forming member 73 is a relatively large value, and the magnetic path area between the solenoid housing 55 and the fixed core 52 is sufficiently large. It becomes possible to do.
[0039]
As a result, while the annular gap 67 remains open, the attraction force characteristic indicated by the broken line in FIG. 7 is shown, whereas when the magnetic path forming member 73 is inserted into the gap 67, the solid line in FIG. As shown, excellent suction characteristics can be obtained.
[0040]
[Primary pressure reducing valve 37]; In FIG. 8, the valve housing 90 of the primary pressure reducing valve 37 is composed of a lower portion of the body 34 and a cover 91 fastened to the lower surface of the body 34 by a plurality of bolts 92. The peripheral edge of the diaphragm 93 is sandwiched between the lower surface of the body 34 and the cover 91.
[0041]
The lower surface of the body 34 is provided with a concave portion 95 that forms a decompression chamber 94 with the diaphragm 93. A circular raised portion 96 that protrudes toward the diaphragm 93 is formed at the central portion of the closed end of the concave portion 95. Provided.
[0042]
The body 34 is provided with a bottomed attachment hole 97 having a lower end opened to the decompression chamber 94 side and closed at the upper end, and this attachment hole 97 is formed at the center of the lower end of the raised portion 96. A first hole 97a having a lower end, a second hole 97b having a smaller diameter than the first hole 97a and a lower end coaxially connected to the upper end of the first hole 97a, and a smaller diameter than the second hole 97b. The third hole 97c has a lower end coaxially connected to the upper end of the second hole 97b, and has a smaller diameter than the third hole 97c, and the lower end is coaxially connected to the upper end of the third hole 97c and the upper end is closed. A passage 79 that is configured by the fourth hole 97d and guides CNG from the electromagnetic shut-off valve 36 is opened on the inner surface of the second hole 97b.
[0043]
A cylindrical valve seat member 98 is screwed into the first hole portion 97a of the mounting hole 97 so as to sandwich an annular seal member 99 between the step portion between the first and second hole portions 97a and 97b. Is done. That is, a female screw 100 is formed on the lower inner surface of the first hole 97 a in the mounting hole 97, and the valve seat member 98 is screwed into the female screw 100.
[0044]
Moreover, a plurality of, for example, a plurality of, for example, four grooves 101 extending in the radial direction of the valve seat member 98 in a plane perpendicular to the axis of the mounting hole 97 are formed on the end face of the valve seat member 98 on the decompression chamber 94 side. Four protrusions 102 are provided so as to protrude, and the grooves 101 are arranged in a cross shape. Thus, when the valve seat member 98 is screwed into the female screw 100, the valve seat member 98 can be rotated by engaging a tool (not shown) with the grooves 101 arranged in a cross shape. The member 98 can be easily attached to the body 34.
[0045]
A valve chamber 103 communicating with the passage 79 is formed between the valve seat member 98 and the upper end closed portion of the mounting hole 97. Further, the valve seat member 98 is integrally provided with an inward flange 98a projecting radially inward at the end on the decompression chamber 94 side, and a valve communicating with the decompression chamber 94 on the inner periphery of the inward flange 98a. A hole 104 is formed, and a tapered valve seat 105 that faces the valve chamber 103 is formed on the inner surface of the inward flange 98a with the valve hole 104 opened in the center.
[0046]
Referring also to FIG. 9, a synthetic resin valve body 106 that can be seated on the valve seat 105 is accommodated in the valve chamber 103, and the valve body 106 is arranged coaxially with the valve hole 104. It is fixed to the shaft 107.
[0047]
The valve body 106 is formed in a cylindrical shape with one end surface facing the valve seat 105 being tapered so as to be seated on the tapered valve seat 105, and the valve shaft 107 is elastic to the valve body 106. By being fitted to each other, the valve shaft 107 is fixed. In addition, a pair of O-rings 108 and 108 that elastically contact the inner surface of the valve body 106 are mounted at positions spaced apart in the axial direction on the outer surface of the valve shaft 107.
[0048]
One end portion of the valve shaft 107 is supported by the body 34 so as to be movable in the axial direction by a bearing 109 interposed between the mounting hole 97 and the inner surface of the third hole portion 97c. Further, on the outer surface of the valve body 106, there are provided guide portions 110, which are slidably contacted with the inner surface of the valve seat member 98 at a plurality of positions, for example, at four positions spaced at equal intervals in the circumferential direction. Between the body 106 and the valve seat member 98, flow passages 111... Extending along the axial direction of the valve shaft 107 are formed.
[0049]
A retainer 112 for holding the bearing 109 between the mounting hole 97 and the stepped portion between the third and fourth hole portions 97c and 97d contacts the stepped portion between the second and third hole portions 97b and 97c. A spring 113 is contracted between the retainer 112 and the valve body 106.
[0050]
A spring chamber 116 is formed between the cover 91 and the diaphragm 93, and a coil spring 117 that urges the diaphragm 93 toward the decompression chamber 94 is housed in the spring chamber 116.
[0051]
The cover 91 is provided with a storage hole 118 extending coaxially with the valve hole 104 so as to open the outer end. The storage hole 118 includes a screw hole portion 118a on the axially outer side and the screw hole. It has a sliding hole 118b on the inner side in the axial direction that has a larger diameter than the portion 118a and is coaxially connected to the screw hole 118a. Moreover, the inner diameter of the storage hole 118 is set to such an extent that the coil spring 117 can be inserted and removed.
[0052]
Referring also to FIG. 10, a first portion integrally including a cylindrical portion 119 a that penetrates the central portion of the diaphragm 93 and protrudes toward the spring chamber 116 is formed on the surface facing the decompression chamber 94 side of the central portion of the diaphragm 93. The diaphragm retainer 119 is brought into contact with the surface facing the spring chamber 116 side of the central portion of the diaphragm 93, and the inner periphery of the annular step portion 121 provided on the outer surface of the cylindrical portion 119 a is engaged with the central portion of the diaphragm 93. A second diaphragm retainer 120 sandwiched between the first diaphragm retainer 119 and the first diaphragm retainer 119 is brought into contact.
[0053]
On the other hand, the sliding hole 118b of the storage hole 118 is fitted so that the piston 123 formed in a cylindrical shape can slide in the axial direction within a limited range, and the piston 123 on the diaphragm 93 side is fitted. A ring plate-like contact plate portion 123a that contacts the annular step portion 122 and the second diaphragm retainer 120 provided on the outer surface of the cylindrical portion 119a, and an end portion are in contact with the end portion so as to surround the cylindrical portion 119a. A cylindrical portion 123b that is continuous with the inner periphery of the plate portion 123a is provided. In addition, the tip of the cylindrical portion 123b of the piston 123 is set to be at an outer position than the tip of the cylindrical portion 119a in the first diaphragm retainer 119.
[0054]
A diaphragm rod 124 is inserted into the central portion of the first diaphragm retainer 119 from the decompression chamber 94 side, and an annular step portion 125 facing the decompression chamber 94 side is formed on the inner surface of the cylindrical portion 119a of the first diaphragm retainer 119. Provided, the diaphragm rod 124 is engaged with the annular step 125. Further, a screw shaft portion 124a is provided on the diaphragm rod 124 at a protruding portion from the cylindrical portion 119a, and a nut 127 is screwed to the screw shaft portion 124a with a washer 126 interposed between the tip of the cylindrical portion 123b. By tightening the nut 127, the central portion of the diaphragm 93 is sandwiched between the diaphragm retainers 119 and 120, the diaphragm rod 124 is fixed to the central portion of the diaphragm 93, and the piston 123 is connected to the central portion of the diaphragm 93. Will be. In addition, in order to seal between the decompression chamber 94 and the spring chamber 116, an annular seal member 128 attached to the outer periphery of the diaphragm rod 124 elastically contacts the inner surface of the cylindrical portion 119a.
[0055]
The other end portion of the valve shaft 107, that is, the end portion on the diaphragm 93 side is fastened coaxially to the diaphragm rod 124. The diaphragm rod 124 has a fitting hole 130 having one end opened on the valve shaft 107 side, A bottomed screw hole 131 having a smaller diameter than the fitting hole 130 and coaxially connected to the other end of the fitting hole 130 is provided. On the other hand, the valve shaft 107 has a fitting shaft portion 107a fitted in the fitting hole 130 and a male screw portion 107b which can be screwed into the screw hole 131 and is coaxially connected to the fitting shaft portion 107a. The axial length L _{1 of} the male screw portion 107b is set shorter than the axial length L ₂ of the fitting hole 130 (L ₁ <L ₂ ).
[0056]
In addition, the seal member 128 that elastically contacts the inner surface of the cylindrical portion 119a is attached to the outer periphery of the diaphragm rod 124 at a portion corresponding to the outer side of the screw hole 131 having a smaller diameter than the fitting hole 130. Thus, the diameter of the diaphragm rod 124 can be reduced as much as possible.
[0057]
By the way, the diaphragm 93 relatively increases the thickness of the connecting portion of the valve shaft 107, that is, the central portion, and the portion sandwiched between the body 34 and the cover 91, that is, the thickness of the peripheral portion. The portion connecting the peripheral portions is formed in a relatively thin curved surface shape. According to such a diaphragm 93, the pressure resistance of the diaphragm 93 can be improved and the response at a low temperature can be achieved. Can also be improved.
[0058]
The second diaphragm retainer 120 is integrally provided on the outer peripheral side with a deflection regulating portion 120a that regulates the deflection of the diaphragm 93 toward the spring chamber 116 side. The bending restricting portion 120 a is formed in a curved shape that swells toward the spring chamber 116, and the outer peripheral edge of the bending restricting portion 120 a is close to and faces the inner surface of the cover 91. In addition, the thickness of the diaphragm 93 is formed larger than the gap at a portion corresponding to the gap between the outer edge of the bending restricting portion 120a and the inner peripheral surface of the cover 91.
[0059]
An adjustment screw 132 is threadably engaged with the outer end opening of the storage hole 118, that is, the screw hole 118a. The adjustment screw 132 and the piston 123 connected to the central portion of the diaphragm 93 are in contact with each other. A coil spring 117 is contracted between the plate portion 123a. Therefore, the spring load of the coil spring 117 can be adjusted by adjusting the advance / retreat position of the adjustment screw 132. In addition, a recess 132 a that receives the entire end of the coil spring 117 is provided on the inner end of the adjustment screw 132 on the side opposite to the diaphragm 93.
[0060]
Further, a lock nut 133 is screwed into a protruding portion of the adjustment screw 132 from the cover 91, and the adjustment screw 132 is provided with an opening hole 134 for opening the spring chamber 116 to the atmosphere.
[0061]
By the way, the piston 123 slides integrally with the diaphragm 93. On the outer surface of the piston 123, a plurality of, for example, a pair of O-rings 135 and 135 that are in sliding contact with the inner surface of the cover 91 are provided. It is mounted with an interval in the direction, and grease 136 is filled between the outer surface of the piston 123 and the cover 91 between the O-rings 135 and 135. Moreover, when both O-rings 135 and 135 are attached to the piston 123 from one axial direction, one of the O-rings 135 and 135 may be damaged by the O-ring groove. Curved chamfered portions 123c and 123d are provided on the outer surfaces of both ends, and the O-rings 135 and 135 can be easily attached to the piston 123 from both ends in the axial direction while avoiding damage by the O-ring groove. Can do. Further, in order to prevent the O-rings 135 and 135 from being damaged when the piston 123 with the O-rings 135 and 135 is inserted into the storage hole 118, the inner end opening of the storage hole 118 has a tapered chamfer. A portion 118c is provided.
[0062]
Thus, in order to avoid sealing between the piston 123 and the diaphragm 93 in the spring chamber 116 by the O-rings 135 and 135, the communication hole 129 extending between the inner and outer surfaces of the cylindrical portion 123b of the piston 123 is provided. Is provided.
[0063]
The body 34 is provided with a plurality of, for example, four passages 137, 137... Extending upwardly through the decompression chamber 94 so as to be arranged around the mounting hole 97 at intervals. Furthermore, a plurality of, for example, four protrusions 138 that can contact the first diaphragm retainer 119 at the center of the diaphragm 93 are provided between the raised portions 96 of the body 34 so as to restrict the bending of the diaphragm 93 toward the decompression chamber 94. Are formed so as to form grooves 139... CNG that has passed through the valve hole 104 from the valve chamber 103 when the first diaphragm retainer 119 contacts each projection 138. It is possible to flow into the decompression chamber 94 through the grooves 101 formed at the end of the decompression chamber 94 and the grooves 139.
[0064]
In such a primary pressure reducing valve 37, when high pressure CNG does not flow into the valve chamber 103, the diaphragm 93 is bent toward the pressure reducing chamber 94 by the spring force of the coil spring 117, and the valve body 106 is in the valve seat 105. The valve hole 104 is opened away from the valve. Thus, the high-pressure CNG flowing into the valve chamber 103 flows into the decompression chamber 94 from the valve hole 104, and the pressure in the decompression chamber 94 moves the diaphragm 93 toward the spring chamber 116 against the spring force of the coil spring 117. When increased to such an extent that the valve body 106 is bent, the valve body 106 is seated on the valve seat 105 and the valve hole 104 is closed. By repeating such opening and closing of the valve hole 104, the valve chamber 103 is provided with, for example, 250~10kg / cm CNG having flown at a high pressure of ^2, made for example from 6~7kg / cm ² under reduced pressure chamber 94 is depressurized to a to flow into the passages 137 and 137 ....
[0065]
The body 34 is provided with a bottomed mounting hole 97 that is coaxial with the axis of the valve shaft 107 and opens toward the decompression chamber 94, and the valve chamber 103 that houses the valve body 106 is connected to the closed end of the mounting hole 97. A cylindrical valve seat member 98 formed between the valve seat member 98 and the valve chamber 103 is formed on the inner surface of the end portion of the valve seat member 98 on the decompression chamber 94 side. Therefore, compared with a configuration in which a valve seat is formed at the inner end of the storage hole provided in the body to store the valve body and a lid member for sealing the outer end of the storage hole is attached to the body. A member such as a lid member does not need to be attached, and the number of parts can be reduced, and the degree of freedom in arrangement of the primary pressure reducing valve 37 to the body 34 can be increased. In addition, since the valve seat 105 is formed on the inner surface of the end portion of the valve seat member 98 on the decompression chamber 94 side, the valve body 106 can be disposed as close as possible to the decompression chamber 94 side, and the body 34 can be downsized. Can also contribute.
[0066]
Further, one end portion of the valve shaft 107 is supported by the body 34 via the bearing 109, and a plurality of guide portions 110, which are in sliding contact with the inner surface of the valve seat member 98 at a plurality of positions spaced in the circumferential direction, are provided on the valve body 106. A flow passage 111 extending along the axial direction of the valve shaft 107 is formed between the valve body 106 and the valve seat member 98 between the guide portions 110. Accordingly, one end portion of the valve shaft 107 is supported by the body 34 so as to be movable in the axial direction, and the valve shaft 107 is axially connected to the body 34 via the valve body 106 and the valve seat member 98 at a portion where the valve body 106 is fixed. Even if a lateral load by the coil spring 117 acts on the valve shaft 107 or the center of the diaphragm 93 is misaligned, the valve shaft 107 is prevented from falling down. The axis line of the seat 105 and the axis line of the valve body 106 can be exactly matched, and the valve body 106 can be reliably seated on the valve seat 105 over the entire circumference.
[0067]
By the way, since the valve body 106 is made of a synthetic resin, the valve body 106 is cured and the sealing performance is lowered due to a decrease in the environmental temperature. Therefore, the pressure regulation failure accompanying the inclination of the valve body 106 with respect to the valve seat 105 appears more markedly as the environmental temperature decreases. However, as shown by the broken line in FIG. 34, a pressure regulation failure occurs on the low temperature side due to the inclination of the valve body, and the degree of decompression decreases. On the other hand, as described above, the valve shaft 107 has one end portion and the valve body 106 portion. In the case of being supported by the body 34 and the valve seat member 98, as shown by the solid line in FIG. 11, the valve body 106 can always be properly seated on the valve seat 105 without tilting, so that a poor pressure regulation occurs. It is possible to obtain a higher degree of vacuum.
[0068]
In addition, sliding resistance caused by the sliding contact between the guide portions 110 provided on the valve body 106 made of synthetic resin and the inner surface of the valve seat member 98 is generated against the vibration of the coil spring 117, and self-excited vibration. Can be prevented as much as possible.
[0069]
The valve seat member 98 is screwed into the mounting hole 97, but extends in the radial direction of the valve shaft 107 on the end surface of the valve seat member 98 on the pressure reducing chamber 94 side in a plane perpendicular to the axis of the valve shaft 107. Since a plurality of protrusions 102 are formed so as to form a plurality of grooves 101 between them, the valve seat member 98 is rotated by engaging a tool with the grooves 101 between the protrusions 102. The valve seat member 98 can be easily attached to the body 34.
[0070]
The valve shaft 107 is fastened to a diaphragm rod 124 fixed to the central portion of the diaphragm 93. The diaphragm rod 124 has a fitting hole 130 and a bottomed screw coaxially connected to the fitting hole 130. The valve shaft 107 is provided with a fitting shaft portion 107a fitted into the fitting hole 130, and can be screwed into the screw hole 131 and coaxial with the fitting shaft portion 107a. A continuous male screw portion 107 b is provided, and the axial length L _{1 of the} male screw portion 107 b is set shorter than the axial length L ₂ of the fitting hole 130. For this reason, when the screwing of the male screw portion 107b into the screw hole 131 is started, a part of the fitting shaft portion 107a is already fitted in the fitting hole 130. Therefore, even if chips are generated by screwing into the screw hole 131 of the male screw portion 107b, the chips are enclosed between the valve shaft 107 and the diaphragm rod 124, so that it is not necessary to remove the chips. The assembly work efficiency can be improved.
[0071]
The cover 91 is provided with a housing hole 118 having an outer end opened so that the coil spring 117 can be inserted and removed, and is coaxial with the axis of the valve hole 104 and is screwed into the outer end opening of the housing hole 118. Since the adjustment screw 132 is provided with a recess 132a for receiving the entire end of the coil spring 117 opposite to the diaphragm 93, it is not necessary to receive the coil spring 117 by the retainer on the side opposite to the diaphragm 93. The score can be reduced. In addition, when the peripheral edge of the diaphragm 93 is sandwiched between the body 34 and the cover 91, the coil spring 117 can be removed from the cover 91, and the cover 91 can be attached to the body 34 by avoiding a biased load acting on the diaphragm 93. Since it can be fastened, it is possible to prevent the diaphragm 93 from being displaced, to allow the valve body 106 to be securely seated on the valve seat 105, and to prevent the occurrence of poor pressure regulation. Further, when the coil spring 117 is compressed by the adjustment screw 132, the concave portion 132a of the adjustment screw 132 serves as a guide function for the end of the coil spring 117, and it is possible to prevent the coil spring 117 from being inclined.
[0072]
Further the outer surface of the piston 123 which reciprocates in the axial direction of the valve shaft 107 in response to deflection of the diaphragm 93, and O-ring 1 35,135 more example of a pair elastically sliding contact with the inner surface of the cover 91 is mounted Therefore, a sliding resistance against the self-excited vibration of the coil spring 117 can be obtained.
[0073]
The sliding resistance can also be obtained by mounting a single O-ring 135 on the outer surface of the piston 123. When a single O-ring 135 is mounted, the sliding resistance is indicated by a broken line in FIG. Whereas a hysteresis is shown, when a pair of O-rings 135 and 135 are attached, as shown by a solid line in FIG. 12, a larger hysteresis is shown, and the self-excited vibration of the coil spring 117 is counteracted. A larger sliding resistance can be obtained by the pair of O-rings 135 and 135.
[0074]
Moreover, since the grease 136 is filled between the O-rings 135 and 135, the outflow of the grease 136 can be avoided as much as possible even by long-term operation, and the wear of the O-rings 135 and 135 can be suppressed. Even if the oil component contained in the air that has entered from outside enters the O-rings 135 and 135, the sliding resistance is set in consideration of the grease 136 in the initial state. There will be no decline. Furthermore, since the necessary sliding resistance is obtained by the pair of O-rings 135 and 135, each compression rate setting in consideration of permanent distortion of each O-ring 135 and 135 is performed to obtain an appropriate sliding resistance. The diameters of the O-rings 135 and 135 are not increased, and the degree of freedom in arrangement of the O-rings 135 and 135 can be increased.
[0075]
Further, the piston 123 is slidably fitted to the cover 91 so as to be able to move within a range limited in the axial direction of the valve shaft 107 and is connected to the center portion of the diaphragm 93. The piston 123 can be provided with a centering function that makes the deflection direction coincide with the axis of the valve hole 104. That is, the diaphragm 93 is subjected to a spring force in the direction of reducing the volume of the decompression chamber 94 by the coil spring 117 having a relatively large spring force. However, when the coil spring 117 falls down, the diaphragm 93 The direction in which the valve body 107 is bent, that is, the axis of the valve shaft 107 is also tilted, and the seating of the valve body 106 on the valve seat 105 may be incomplete, resulting in poor pressure regulation. However, since the piston 123 is slidably fitted to the cover 91, it is possible to prevent the axis of the valve shaft 107 from collapsing and prevent a pressure regulation failure from occurring.
[0076]
In addition, the piston 123 is provided with a communication hole 129 that allows communication between the inside and the outside of the piston 123, so that the back pressure of the diaphragm 93 is prevented from undesirably increasing or decreasing in accordance with the reciprocating motion of the diaphragm 93 and the piston 123.
[0077]
Further, the outer periphery of the second diaphragm retainer 120, which is in contact with and fixed to the central portion of the diaphragm 93 on the spring chamber 116 side, has its outer peripheral edge close to and opposed to the inner surface of the cover 91, and on the spring chamber 116 side. It is formed in a curved shape that swells. Therefore, even when a pressure higher than the specified pressure is applied to the decompression chamber 94, the diaphragm 93 can be smoothly bent from the second diaphragm retainer 120 to the inner surface of the cover 91 as shown by the chain line in FIG. It is possible to prevent the diaphragm 93 from being bent toward the spring chamber 116 at the outer edge of the two diaphragm retainers 120, and to prevent the life of the diaphragm 93 from being shortened by the bending, thereby improving the durability of the diaphragm 93.
[0078]
[Secondary pressure reducing valve 38]; Referring also to FIG. 13, the valve housing 140 of the secondary pressure reducing valve 38 includes a plurality of bolts on an upper portion of the body 34 and an upper surface of a flange portion 77 provided on the upper portion of the body 34. 142. The cover 141 is fastened with a pin 142. The peripheral portion of the diaphragm 143 is sandwiched between the upper surface of the body 34 and the cover 141.
[0079]
The upper surface of the body 34 is provided with a recess 145 that forms a decompression chamber 144 between the diaphragm 143 and the upper end of the body 34 at the center of the closed end of the recess 145 toward the decompression chamber 144 side. At the same time, a bottomed mounting hole 147 whose lower end is closed is provided so as to extend vertically. In addition, a protruding portion 146 that protrudes toward the decompression chamber 144 is provided at the inner end blocking portion of the attachment hole 147.
[0080]
A female screw 150 is formed on the inner surface of the end of the mounting hole 147 on the decompression chamber 144 side, and a cylindrical valve seat member 148 is screwed into the female screw 150. An annular seal member 149 that elastically contacts the inner surface of the mounting hole 147 on the inner side of the female screw 150 is mounted.
[0081]
In addition, a plurality of, for example, four grooves 151 extending in the radial direction of the valve seat member 148 in a plane perpendicular to the axis of the mounting hole 147 are formed on the end face of the valve seat member 148 on the decompression chamber 144 side. Four projecting parts 152 are provided so as to project in a cross shape. Thus, when the valve seat member 148 is screwed into the female screw 150, it is possible to rotate the valve seat member 148 by engaging a tool (not shown) with the grooves 151 arranged in a cross shape. The member 148 can be easily attached to the body 34.
[0082]
A valve chamber 153 is formed between the valve seat member 148 and the lower end closed portion of the mounting hole 147, and a plurality of passages 137, 137... That lead CNG from the primary pressure reducing valve 37 communicate with the valve chamber 153. Is done. The valve seat member 148 is integrally provided with an inward flange 148a projecting radially inward at the end on the decompression chamber 144 side, and a valve that communicates with the decompression chamber 144 on the inner periphery of the inward flange 148a. A hole 154 is formed, and an annular valve seat 155 that faces the valve chamber 153 with the valve hole 154 opened in the center is formed on the inner surface of the inward flange 148a so as to protrude toward the valve chamber 153. .
[0083]
The raised portion 146 is provided with a bottomed sliding hole 157 that opens to the valve hole 154 side and is coaxial with the valve hole 154, and the valve body 156 is slidably fitted into the sliding hole 157. . Moreover, an annular rubber seal 158 that can be seated on the valve seat 155 is fixed to the valve body 156.
[0084]
The valve body 156 is provided with a screw hole 159 coaxially between both axial ends thereof, and one end of the valve shaft 160 coaxial with the valve hole 154 is screwed into the screw hole 159. That is, the valve body 156 is fixed to one end of the valve shaft 160.
[0085]
A back pressure chamber 161 is formed between the valve body 156 and the closed end of the sliding hole 157, and a plurality of, for example, a pair of elastically slidingly contact the inner surface of the sliding hole 157 on the outer surface of the valve body 156. The O-rings 162 and 162 are mounted at an interval in the axial direction of the valve body 156, and between the O-rings 162 and 162, grease (not shown) is provided between the outer surface of the valve body 156 and the inner surface of the sliding hole 157. Is filled.
[0086]
A spring chamber 166 is formed between the cover 141 and the diaphragm 143, and a coil spring 167 that biases the diaphragm 143 toward the decompression chamber 144 is housed in the spring chamber 166.
[0087]
An insertion hole 168 is provided at the center of the diaphragm 143, and an annular seal portion 143a surrounding the insertion hole 168 is provided. A surface of the diaphragm 143 facing the decompression chamber 144 side is provided with the seal portion 143a. the first diaphragm retainer 169 of the ring-shaped surrounding the is in contact, on the surface facing the spring chamber 166 side of the central portion of the diaphragm 143, the second diaphragm retainer 170 is first diaphragm retainer having a central portion an insertion hole 171 169 and the diaphragm 143 are brought into contact with each other.
[0088]
On the other hand, in the spring chamber 166, the cover 141 is fitted so that the cylindrically formed piston 173 is slidable in a limited range, and the end portion of the piston 173 on the diaphragm 143 side is fitted. Is provided with a ring plate-like contact plate portion 173 a that has an insertion hole 172 corresponding to the insertion hole 171 at the center and contacts the second diaphragm retainer 170.
[0089]
A valve shaft 160 having a valve body 156 fixed at one end extends coaxially through the valve hole 154 and extends toward the spring chamber 166, and an annular step 174 that engages with the inner peripheral edge of the first diaphragm retainer 169. In addition, the valve shaft 160 is provided with an annular step portion 175 that sandwiches the seal portion 143 a with the second diaphragm retainer 170. A screw shaft portion 160a is provided at the other end portion of the valve shaft 160 that passes through the insertion holes 168, 171, and 172 and protrudes into the spring chamber 166, and the washer 176 is interposed between the screw shaft portion 160a and the second diaphragm retainer 170. A nut 177 is screwed onto the screw shaft portion 160a. By tightening the nut 177, the center portion of the diaphragm 143 is sandwiched between the diaphragm retainers 169 and 170, and the valve shaft 160 is connected to the center portion of the diaphragm 143. In addition, the valve shaft 160 is provided with a communication passage 163 that allows the decompression chamber 144 to communicate with the back pressure chamber 161.
[0090]
The second diaphragm retainer 170 is integrally provided on the outer peripheral side with a deflection regulating portion 170a that regulates the deflection of the diaphragm 143 toward the spring chamber 166 side. The bending restricting portion 170 a is formed in a curved shape that swells toward the spring chamber 166, and the outer peripheral edge of the bending restricting portion 170 a is close to and faces the inner surface of the cover 141.
[0091]
Incidentally, a support cylinder part 178 having both ends opened is integrally provided at the outer end closing part of the cover 141, and a female screw 179 is engraved on the inner surface of the inner end part of the support cylinder part 178. Thus, the adjusting screw 180 is inserted into the support cylinder portion 178, and the male screw portion 180a provided on the inner end side in the axial direction of the adjusting screw 180 is screwed into the female screw 179 to be inside the spring chamber 166. It is rushed into. The adjustment screw 180 includes a male screw portion 180b on the axially outer side, and the male screw portion 180b protrudes outward from the cover 141. Further, an annular seal member 181 is attached to the outer surface of the axially intermediate portion of the adjusting screw 180, and this seal member 181 elastically contacts the inner surface of the support cylinder portion 178.
[0092]
In the spring chamber 166, a retainer 182 is abutted and supported at the inner end of the adjusting screw 180. Between the retainer 182 and the abutting plate portion 173 a of the piston 173 connected to the center portion of the diaphragm 143. The coil spring 167 is contracted. Therefore, the spring load of the coil spring 167 can be adjusted by adjusting the advance / retreat position of the adjustment screw 180.
[0093]
Further, a nut 184 is screwed into the protruding portion of the adjustment screw 180 from the cover 141, that is, the male screw portion 180b, with a washer 183 interposed between the adjustment screw 180 and the adjustment screw 180 by loosening the nut 184. The advance / retreat position can be adjusted.
[0094]
14 and 15 together, the outer end of adjustment screw 180 and nut 184 are covered with a cap 185 made of synthetic resin. Moreover, the nut 184 includes four flat surfaces 184a arranged parallel to the axis of the adjusting screw 180 at equal intervals in the circumferential direction, and four curved surfaces 184b connecting the flat surfaces 184a. Each of the curved surfaces 184b is provided with an engaging groove 187 that engages an annular engaging protrusion 186 that protrudes from the inner surface of the cap 185.
[0095]
The piston 173 slides integrally with the diaphragm 143. The piston 173 slides elastically on the inner surface of the cover 141 at a plurality of, for example, two positions spaced apart in the axial direction of the outer surface of the piston 173. O-rings 188 and 188 that are in contact with each other are mounted, and grease (not shown) is filled between the O-rings 188 and 188 between the outer surface of the piston 173 and the inner surface of the cover 141. Moreover, when the O-rings 188 and 188 are mounted on the piston 173 from one axial direction, one of the O-rings 188 and 188 may be damaged by the O-ring groove. chamfer at both ends an outer surface and curved 173b, 173 c are provided, said O O-ring 1 88 to avoid damaging the ring groove, 1 88 respectively easily from its axial end side to the piston 173 mounted can do. Further, in order to prevent the O-rings 188 and 188 from being damaged when the piston 173 with the O-rings 188 and 188 attached is inserted into the cover 141, the inner end of the cover 141 where the piston 173 is fitted is installed. Is provided with a tapered chamfer 141a.
[0096]
The said Thus O-ring 188 and 188, to between the piston 173 and the diaphragm 143 in the spring chamber 166 to avoid that would be sealed, the piston 173, the communication hole 1 92 is provided extending between its inner and outer surfaces .
[0097]
The body 34 is provided with a passage 189 communicating with the decompression chamber 144, and a conduit 30 connected to the injector 29 of the engine E is connected to the passage 189. Further, a connecting pipe 190 is connected to the cover 141, and intake negative pressure of the engine E is introduced into the spring chamber 166 through the connecting pipe 190 and a pipe line (not shown) connected to the connecting pipe. Is done.
[0098]
In such a secondary pressure reducing valve 38, when CNG does not flow into the valve chamber 153, the diaphragm 143 is bent toward the pressure reducing chamber 144 by the spring force of the coil spring 167, and the valve body 156 is moved from the valve seat 155. The valve hole 154 is opened away. Thus, CNG that has flowed into the valve chamber 153 flows into the decompression chamber 144 from the valve hole 154, and the differential pressure between the decompression chamber 144 and the spring chamber 166 resists the spring force of the coil spring 167, causing the diaphragm 143 to spring. If the valve body 156 is increased to the extent that it is bent toward the chamber 166 side, the valve body 156 is seated on the valve seat 155 and the valve hole 154 is closed, and the valve hole 154 is repeatedly opened and closed, so that the valve CNG having flown for example 6~7kg / cm ² to the chamber 153, is supplied to the injector 29, for example, it is reduced to 2-3 kg / cm ² through the passage 189 and line 30 from vacuum chamber 144.
[0099]
The body 34 is provided with a bottomed mounting hole 147 that is coaxial with the axis of the valve shaft 160 and opens toward the decompression chamber 144, and the valve chamber 153 that accommodates the valve body 156 has a closed end of the mounting hole 147. A cylindrical valve seat member 148 formed between the valve seat 148 and the mounting hole 147 is screwed, and a valve seat 155 facing the valve chamber 153 is formed on the inner surface of the end portion of the valve seat member 148 on the decompression chamber 144 side. Therefore, compared with a configuration in which a valve seat is formed at the inner end of the storage hole provided in the body to store the valve body and a lid member for sealing the outer end of the storage hole is attached to the body. A member such as a lid member does not need to be attached, and the number of parts can be reduced, and the degree of freedom in arranging the secondary pressure reducing valve 38 on the body 34 can be increased. Moreover, since the valve seat 155 is formed on the inner surface of the end of the valve seat member 148 on the decompression chamber 144 side, the valve body 156 can be disposed as close as possible to the decompression chamber 144 side, and the body 34 can be downsized. Can also contribute.
[0100]
The valve seat member 148 is screwed into the mounting hole 147, and a plurality of valve seat members 148 extend in the radial direction of the valve shaft 160 in a plane perpendicular to the axis of the valve shaft 160 on the end surface of the valve seat member 148 on the decompression chamber 144 side. Since the plurality of protrusions 152 are formed between the protrusions 152, the tool is engaged with the grooves 151 between the protrusions 152 to rotate the valve seat member 148. This is possible, and attachment of the valve seat member 148 to the body 34 is facilitated. In addition, the deflection of the diaphragm 143 toward the decompression chamber 144 is restricted by contacting the projections 152. However, even when the diaphragm 143 is in contact with the projections 152, the grooves 151. The valve hole 154 and the decompression chamber 144 can be communicated with each other.
[0101]
Further, a plurality of, for example, a pair of O-rings 162 and 162 that are elastically slidably contacted with the body 34 are mounted on the outer surface of the valve body 156 that reciprocates in the axial direction of the valve shaft 160 according to the deflection of the diaphragm 143, and the diaphragm 143 is bent. Accordingly, a plurality of, for example, a pair of O-rings 188 and 188 that are elastically slidably contacted with the inner surface of the cover 141 are mounted on the outer surface of the piston 173 that reciprocates in the axial direction of the valve shaft 160. A high sliding resistance against self-excited vibration can be obtained.
[0102]
In addition, since the grease is filled between the O-rings 162 and 162 and between the O-rings 188 and 188, the O-rings 162 and 162; Even if the oil component contained in the CNG adheres to the O-rings 162 and 162, or the oil component contained in the intake air introduced into the spring chamber 166 adheres to the O-rings 188 and 188, Since the sliding resistance is set in consideration of the grease in the initial state, the sliding resistance is not lowered. Further, since the required sliding resistance is obtained by the pair of O-rings 162, 162; 188, 188, the compression rate setting is set in consideration of the permanent distortion of each O-ring 162, 188 in order to obtain an appropriate sliding resistance. Even if it carries out, it does not cause the diameter increase of each O-ring 162,188, and the freedom degree on arrangement | positioning of O-ring 162,162; 188,188 can be increased.
[0103]
Further, since the piston 173 is movable in a range limited in the axial direction of the valve shaft 160 and is slidably fitted to the cover 141 and coupled to the center portion of the diaphragm 143, the piston 173 The piston 173 can be provided with a centering function that makes the deflection direction coincide with the axis of the valve hole 154. That is, the diaphragm 143 is subjected to a spring force in a direction to reduce the volume of the decompression chamber 144 by the coil spring 167 having a relatively large spring force. However, when the coil spring 167 falls down, the diaphragm 143 The direction in which the valve body 156 is bent, that is, the axis of the valve shaft 160 is also tilted, and the seating of the valve body 156 on the valve seat 155 may be incomplete, resulting in poor pressure regulation. However, since the piston 173 is slidably fitted to the cover 141, it is possible to prevent the axis of the valve shaft 160 from collapsing and to prevent poor pressure regulation.
[0104]
Moreover, the piston 173 is provided with a communication hole 192 that allows the inside and outside of the piston 173 to communicate with each other, so that the back pressure of the diaphragm 143 is prevented from undesirably increasing or decreasing according to the reciprocation of the diaphragm 143 and the piston 173.
[0105]
Further, the second diaphragm retainer 170 that contacts and is fixed to the central portion of the diaphragm 143 on the spring chamber 166 side is provided with a deflection restricting portion 170a provided on the outer peripheral portion, with the outer peripheral edge approaching and facing the inner surface of the cover 141, and the spring chamber. It is formed in a curved shape that swells toward the 166 side. Therefore, even when a pressure higher than a specified pressure is applied to the decompression chamber 144, the diaphragm 143 can be smoothly bent from the second diaphragm retainer 170 to the inner surface of the cover 141 as shown by a chain line in FIG. It is possible to prevent the diaphragm 143 from being bent toward the spring chamber 166 at the outer edge of the two diaphragm retainer 170, and to prevent the life of the diaphragm 143 from being shortened by the bending, thereby improving the durability of the diaphragm 143.
[0106]
Further, four flat surfaces 184a are arranged at equal intervals in the circumferential direction so that nuts 184 screwed to the outer end of the adjusting screw 180 to fix the advance / retreat position of the adjusting screw 180 are parallel to the axis of the adjusting screw 180. .. And four flat curved surfaces 184b connecting the flat surfaces 184a, and an annular engaging projection 186 projecting from the inner surface of the cap 185 is engaged. Engaging grooves 187 to be provided are provided on the respective curved surfaces 184b. That is, since the cap 185 is attached to the nut 184, the cap 185 can be reduced in size, and since the nut 184 has a four-chamfered outer peripheral surface, the number of processing steps of the nut 184 can be reduced. In addition, since the engagement grooves 187 are provided on each of the curved surfaces 184b, the engagement grooves 187 are formed relatively long so that the amount of engagement of the engagement protrusions 186 of the cap 185 to the engagement grooves 187. The cap 185 can be prevented from being easily removed.
[0107]
[Relief valve 39]; with particular attention to FIG. 4, the relief valve 39 is connected to one of a plurality of passages 137, 137... Connecting the primary pressure reducing valve 37 and the secondary pressure reducing valve 38. A valve housing 196 that is attached to the side portion of 34 and has a valve hole 195 leading to the passage 137 at the tip and fixed to the body 34, and a rubber seal 197 that can close the valve hole 195 at the front end. A body 198 and a spring 199 that biases the valve body 198 in a direction to close the valve hole 195 with the rubber seal 197 are housed. The valve housing 196 and the valve body 198 are opened from the passage 137 when the valve hole 195 is opened. The CNG is formed to be open to the outside.
[0108]
According to the relief valve 39, when the valve opening pressure determined by the spring 199 exceeds, for example, 16.5 kg / cm ² and the pressure in the passage 137 rises, the valve is opened and CNG is released to the atmosphere.
[0109]
[Thermostat 40]; With particular attention to FIG. 5, the body 34 is provided with a filter 35, an electromagnetic shut-off valve 36, a primary pressure reducing valve 37, a secondary pressure reducing valve 38, and a relief valve 39 provided on the body 34. The hot water passage 33 is provided so as not to get in the way, the connecting pipe 201 leading to the inlet of the hot water passage 33 is attached to the body 34, and the thermostat 40 is attached to the body 34 on the outlet side of the hot water passage 33. .
[0110]
The thermostat 40 has a conventionally well-known configuration, and a valve body 204 capable of opening and closing a valve hole 203 provided at the outer end of the housing 202 fixed to the body 34 is changed according to the degree of expansion of the wax 205 due to the water temperature. Configured to operate. Thus, when the water temperature exceeds 80 degrees, for example, the valve body 204 is driven to close the valve hole 203 by the wax 205, so that the temperature of the body 34 does not rise above 80 degrees. Adjusted to.
[0111]
Incidentally, in the regulator R in which the body 34 is provided with the filter 35, the electromagnetic shut-off valve 36, the primary pressure reducing valve 37, the secondary pressure reducing valve 38, the relief valve 39, and the thermostat 40, the primary pressure reducing is performed at the lower part and the upper part of the body 34. A valve 37 and a secondary pressure reducing valve 38 are mounted with their valve bodies 96 and 156 arranged coaxially, and a filter 35, an electromagnetic shut-off valve 36, a relief valve 39 and a thermostat 40 are arranged on the side of the body 34. Therefore, the regulator R can be configured as compact as possible. In addition, the electromagnetic shut-off valve 36 and the relief valve 39 are disposed in a space generated below the flange portion 77 provided in the body 34 to fasten the cover 141 of the secondary pressure reducing valve 38. Due to the downsizing of the regulator R, It can contribute even more.
[0112]
Although the embodiments of the present invention have been described in detail 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.
[0113]
For example, the number of engaging claws need not be a pair as in the above embodiment, but may be one. Further, the present invention can be applied to a structure in which the solenoid housing 55 is fastened to the fixed core 52 by screwing a bolt into the fixed core 52 instead of the screw shaft portion 52a and the cap nut 70.
[0114]
【The invention's effect】
As described above, according to the present invention, the surface on the cylindrical portion side of the flange portion, which is extended to one side of the cylindrical portion of the solenoid housing and is provided integrally with the body, serves as the regulating wall, Since the engaging claw that contacts and prevents the solenoid housing from rotating projects from the other end of the cylindrical portion, the solenoid housing tries to rotate around the fastening portion of the end plate portion to the fixed core. In addition, the engaging claw projecting from the other end of the cylindrical portion engages with the restriction wall of the flange portion provided integrally with the body to prevent the rotation, and tightening strength is increased. The solenoid housing can be prevented from rotating with a simple structure that does not require an increase. Moreover, since the restriction wall is a surface of the flange portion provided on the body on the cylindrical portion side, it is not necessary to form a restriction wall specially.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of a fuel supply device for a vehicle.
FIG. 2 is a side view of the regulator.
FIG. 3 is a plan view of the regulator.
4 is a cross-sectional view taken along line 4-4 of FIG.
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is an enlarged longitudinal sectional view of an electromagnetic shut-off valve.
FIG. 7 is a diagram showing suction characteristics in an electromagnetic shut-off valve.
FIG. 8 is an enlarged longitudinal sectional view of a primary pressure reducing valve.
9 is an enlarged cross-sectional view taken along line 9-9 of FIG.
10 is an enlarged view of a main part of FIG.
FIG. 11 is a diagram showing a pressure reduction characteristic according to an environmental temperature of the primary pressure reducing valve.
FIG. 12 is a diagram showing hysteresis characteristics depending on the number of O-rings attached to the piston.
FIG. 13 is an enlarged longitudinal sectional view of a secondary pressure reducing valve.
14 is a cross-sectional view taken along line 14-14 of FIG.
15 is a longitudinal side view in which only the cap is cut along the line 15-15 in FIG. 14;
[Explanation of symbols]
34 ... Body 50 ... Coil assembly 51 ... Guide cylinder 52 ... Fixed core 53 ... Plunger 55 ... Solenoid housing 55a ... Cylindrical part 55b ... End plate part 59- .... Bobbin 60 ... Coil 61 ... Covering part 61a ... Coupler part 74 ... Notch 75 ... Engaging claw 76 ... Restriction wall

Claims (1)

A coil assembly (50) in which a bobbin (59) and a coil (60) wound around the bobbin (59) are covered with a covering portion (61) made of a synthetic resin, and inserted into the bobbin (59) A non-magnetic material guide tube (51) fixed to the body (34), a fixed core (52) fixed to the guide tube (51) by closing one end of the guide tube (51), A plunger (53) slidably fitted to the guide cylinder (51) facing the fixed core (52), a cylindrical part (55a) surrounding the coil assembly (50), and the cylindrical part (55a) ) And a magnetic metal solenoid housing (55) having an end plate portion (55b) fastened to the fixed core (52) and provided in the cylindrical portion (55a). (74) Coupler protruding outside In the solenoid device (61a) is formed integrally with the cover portion (61) and the body (34) provided in the flange portion overhangs (77) is integral with one side of the cylindrical portion (55a) The surface of the flange portion (77) on the cylindrical portion (55a) side is a restricting wall (76), and is engaged with the restricting wall (76) to prevent the solenoid housing (55) from rotating. A claw (75) projects from the other end of the cylindrical part (55a) .

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