Solenoid valve and method for manufacturing a solenoid valve

Abstract

To provide a solenoid valve which enables reduction of a possibility that looseness occurs, easy assembly, and downsizing, and to provide a manufacturing method of the solenoid valve.SOLUTION: A solenoid valve V according to the invention comprises: a bottomed cylindrical cap 1 that is attached to an opening of a valve hole 38b1 of a housing 38b having the valve hole 38b1 which is open from one end side; a solenoid S that is accommodated in the cap 1; a valve seat member 2 that has a port 2a, is accommodated in the valve hole 38b1, and is aligned in a radial direction of the solenoid S by the solenoid S; and a valve element 3 that can open and close the port 2a of the valve seat member 2 and that is driven by the solenoid S. The solenoid S and the valve seat member 2 are sandwiched between a bottom part 38b4 of the valve hole 38b1 of the housing 38b and the cap 1 and fixed to the housing 38b.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a solenoid valve and a method for manufacturing the solenoid valve.

Background Art

[0002] The solenoid valve is used, for example, as a damping valve of a shock absorber to adjust the damping force of the shock absorber.

[0003] Such a solenoid valve includes, for example, a cylindrical housing, a cylindrical cap that is screwed to the inner circumference of the housing and houses a solenoid inside, a valve case that is screwed to the inner circumference of the cap, a valve seat member sandwiched between the valve case and the cap, and a valve body that can be seated and unseated on the valve seat member and is biased by the solenoid to open and close a port provided on the valve seat member. The resistance applied to the flow of the working oil passing through the port as the shock absorber expands and contracts is changed by adjusting the current supplied to the solenoid (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a conventional solenoid valve, a valve case that houses a valve seat member and a valve body is screwed to a cap to apply an axial axial force to the valve seat member and fix it inside the valve case, and the cap is screwed to the housing to fix the solenoid and the valve seat member.

[0006] Therefore, assembling a solenoid valve requires two screw-connection steps, making the assembly process time-consuming. Furthermore, because there are two screw-connection points in the pressure-sensitive area, there is a possibility that these screw-connection points may loosen when pressure is applied during the solenoid valve's operation. In addition, the shape of the screw-connection points is limited, which restricts the miniaturization of conventional solenoid valves with two screw-connection points.

[0007] Therefore, the present invention aims to provide a solenoid valve and a method for manufacturing a solenoid valve that can reduce the possibility of loosening, is easy to assemble, and can be miniaturized. [Means for solving the problem]

[0008] To solve the aforementioned problems, the solenoid valve of the present invention comprises a bottomed cylindrical cap attached to the opening of a valve hole that opens from one end of a housing, a solenoid housed inside the cap, a valve seat member having a port and housed inside the valve hole, which is centered radially to the solenoid by the solenoid, and a valve body that can open and close the port in the valve seat member and is driven by the solenoid, wherein the solenoid and the valve seat member are sandwiched between the bottom of the valve hole in the housing and the cap and fixed to the housing.

[0009] In this solenoid valve configuration, the cap is attached to the housing, allowing the solenoid and valve seat member to be clamped and fixed between the cap and the bottom of the valve hole in the housing, while the valve seat member is aligned with respect to the solenoid. This makes it possible to fix the valve seat member to the cap and align the valve seat member with respect to the solenoid without using multiple screw connections, and allows the solenoid valve to be fixed to the housing without using multiple screw connections as in conventional solenoid valves.

[0010] Furthermore, the solenoid valve may include a temporary fixing member that temporarily secures the valve seat member to the cap while allowing axial movement. In a solenoid valve configured in this way, the cap, solenoid, valve seat member, and valve body are assembled together by temporarily fixing the valve seat member to the cap, improving the ease of assembly of the solenoid valve into the housing and making assembly even easier.

[0011] Furthermore, the solenoid valve may include a bottomed cylindrical case that houses a valve seat member and a valve body internally, and a temporary fixing member that temporarily fixes the case to the cap in a manner that allows axial movement, and the solenoid and valve seat member may be sandwiched between the bottom of the valve hole of the housing and the cap via the case.

[0012] In a solenoid valve configured in this way, the case is temporarily fixed to the cap, and the solenoid, valve seat member, and valve body are housed in the cap and case and assembled. This improves the ease of assembly of the solenoid valve into the housing, making assembly even easier. Furthermore, since the case is allowed to move axially relative to the cap, fixing the cap to the housing applies axial force to the solenoid, valve seat member, and case, allowing them to be fixed in place.

[0013] Furthermore, the temporary fastening member may be a retaining ring fixed to the inner circumference of the cap. In a solenoid valve configured in this way, the assembly of the solenoid valve becomes even easier by using a retaining ring that is easy to attach to the inner circumference of the cap. In addition, the temporary fastening by the retaining ring prevents the case or valve seat member from falling out of the cap even if a force is applied to pull the case or valve seat member out of the cap. Moreover, since the retaining ring restricts the case or valve seat member from coming out of the cap, it does not interfere with the movement of the case or valve seat member in the direction of entering the back of the cap, so there is no resistance between the case or valve seat member and the retaining ring when attaching the cap to the housing.

[0014] Furthermore, the present invention relates to a method for manufacturing a solenoid valve comprising: a bottomed cylindrical cap attached to the opening of a valve hole in a housing having a valve hole opening from one end; a solenoid housed inside the cap; a valve seat member having a port and housed inside the valve hole, and centered radially to the solenoid by the solenoid; a valve body capable of opening and closing the port in the valve seat member and driven by the solenoid; and a bottomed cylindrical case housing the valve seat member and valve body internally, comprising the steps of: housing the solenoid inside the cap; housing the valve seat member and valve body inside the case; inserting the case into the cap and temporarily fixing the case to the cap; and inserting the cap with the temporarily fixed case into the valve hole and connecting the cap to the housing. Furthermore, another method for manufacturing a solenoid valve according to the present invention is a method for manufacturing a solenoid valve comprising: a bottomed cylindrical cap attached to the opening of a valve hole to a housing having a valve hole that opens from one end; a solenoid housed inside the cap; a bottomed cylindrical valve seat member having a port and housed inside the valve hole, and centered radially to the solenoid by the solenoid; and a valve body that can open and close the port in the valve seat member and is driven by the solenoid, the method comprising the steps of: housing the solenoid inside the cap; housing the valve body inside the valve seat member; inserting the valve seat member inside the cap and temporarily fixing the valve seat member to the cap; and inserting the cap with the temporarily fixed valve seat member into the valve hole and connecting the cap to the housing.

[0015] With this method of manufacturing a solenoid valve, the solenoid valve can be manufactured simply by providing a screw connection between the cap and the housing. This reduces the possibility of loosening, simplifies assembly, and allows for miniaturization. Furthermore, since each component of the solenoid valve can be assembled together, the assembly process becomes even easier. [Effects of the Invention]

[0016] According to the solenoid valve and the method for manufacturing the solenoid valve of the present invention, the possibility of loosening can be reduced, assembly is easy, and miniaturization is possible. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a longitudinal cross-sectional view of a buffer to which a solenoid valve is applied according to one embodiment. [Figure 2] Figure 2 is an enlarged cross-sectional view of a solenoid valve in one embodiment. [Figure 3] Figure 3 is an enlarged cross-sectional view of a solenoid valve in a first modified example of one embodiment. [Modes for carrying out the invention]

[0018] The present invention will be described below based on the embodiments shown in the figures. As shown in Figures 1 and 2, the solenoid valve V in one embodiment comprises a bottomed cylindrical cap 1 attached to the opening of the valve hole 38b1 of the housing 38b, a solenoid S housed inside the cap 1, a valve seat member 2 having a port 2a and housed inside the valve hole 38b1, a valve body 3 that can open and close the port 2a of the valve seat member 2 and is driven by the solenoid S, and a bottomed cylindrical case 4 that houses the valve seat member 2 and the valve body 3 inside. It is applied to a shock absorber D and used as a damping valve to adjust the compression damping force of the shock absorber D.

[0019] Hereinafter, the solenoid valve V of the present embodiment and the configuration of the shock absorber D to which the solenoid valve V is applied will be described in detail. First, the shock absorber D will be described. As shown in FIG. 1, the shock absorber D includes a cylinder 31, a piston rod 32 that is inserted into the cylinder 31 so as to be axially movable, a piston 33 that partitions the inside of the cylinder 31 into an extension chamber R1 and a compression chamber R2, an extension damping passage 33a and a compression damping passage 33b that are provided on the piston 33 and communicate the extension chamber R1 and the compression chamber R2, an extension damping valve 34 that is fixed to the piston rod 32 and opens and closes the extension damping passage 33a, a compression damping valve 35 that is fixed to the piston rod 32 and opens and closes the compression damping passage 33b, a tank 36 provided on the side of the cylinder 31, an outer tube 37 that covers the outer periphery of the cylinder 31, an upper cap 38 that closes the upper end of the cylinder 31 and connects the cylinder 31 and the tank 36, a solenoid valve V that is mounted on a housing 38b provided on the upper cap 38, and a suspension spring 39 interposed between the cylinder 31 and the piston rod 32.

[0020] Hereinafter, each part of the shock absorber D will be described. The cylinder 31 is cylindrical and has a hole 31a that communicates the inside and outside at the lower end in FIG. 1, and is inserted into the outer tube 37. An annular gap that communicates with the inside of the cylinder 31 through the hole 31a provided in the cylinder 31 is formed between the cylinder 31 and the outer tube 37.

[0021] The upper ends of the cylinder 31 and the outer tube 37 in FIG. 1 are both closed by the upper cap 38, and an annular rod guide 40 is attached to the inner periphery of the lower ends of the cylinder 31 and the outer tube 37 in FIG. 1. The outer tube 37 includes a threaded portion 37a to which an annular upper suspension spring receiver 41 and a nut 42 are screwed on the outer periphery of the upper end side in FIG. 1, and a hole 37b that is provided on the upper side in FIG. 1 on the tip side of the threaded portion 37a and communicates the inside and outside of the outer tube 37.

[0022] The upper suspension spring receiver 41 can move up and down relative to the outer tube 37 in the manner of a feed screw with respect to the screw portion 37a by a rotational operation, and is fixed to the screw portion 37a by tightening the nut 42.

[0023] The piston rod 32 has a small-diameter portion 32a with a smaller diameter at the upper end than the lower side, and at the lower end, a bracket 32b that can be connected to the vehicle body or wheels (not shown) of the vehicle, and an annular lower suspension spring receiver 32c laminated above the bracket 32b. Further, a cushion 43 that is cylindrical and abuts against the upper end of the bracket 32b is attached to the outer periphery of the lower end of the piston rod 32 in FIG. 1.

[0024] The piston rod 32 is inserted into the cylinder 31 through the inner periphery of the rod guide 40, and is in sliding contact with the inner periphery of a cylindrical bush 40a fixed to the inner periphery of the rod guide 40, and can move in the axial direction while being guided by the rod guide 40. In addition, an annular seal member 40b that is in sliding contact with the outer periphery of the piston rod 32 is provided on the inner periphery of the rod guide 40 in addition to the bush 40a described above, and the inside of the cylinder 31 is sealed by the seal member 40b. In the present embodiment, the seal member 40b is provided on the inner periphery of the rod guide 40, but a seal member that seals between the cylinder 31 and the piston rod 32 may be provided independently of the rod guide 40 below the rod guide 40.

[0025] A suspension spring 39, which is a coil spring disposed on the outer peripheries of the outer tube 37 and the piston rod 32, is interposed between the upper suspension spring receiver 41 and the lower suspension spring receiver 32c, and the suspension spring 39 always biases the piston rod 32 in a direction of withdrawing it outward from the cylinder 31, that is, in a direction of extending the shock absorber D. When the shock absorber D provided with the suspension spring 39 is interposed between the vehicle body and the wheels of a vehicle (not shown), the vehicle body is elastically supported by the suspension spring 39.

[0026] Furthermore, when the piston rod 32 penetrates deeply into the cylinder 31 and the shock absorber D contracts to near the stroke end on the contraction side, the cushion 43 attached to the outer circumference of the piston rod 32 comes into contact with the rod guide 40 and is compressed, generating an elastic force that suppresses the contraction of the shock absorber D. In this embodiment, the shock absorber D employs a structure in which the cushion 43 comes into contact with the rod guide 40, but a structure in which an annular stopper is provided below the rod guide 40 in Figure 1, facing the cushion 43, and the cushion 43 comes into contact with the stopper and is compressed.

[0027] Furthermore, an annular piston 33 is mounted on the small-diameter portion 32a at the upper end of the piston rod 32. The piston 33 is annular and is attached to the outer circumference of the small-diameter portion 32a of the piston rod 32 by a piston nut 44, together with the extension damping valve 34 and the compression damping valve 35.

[0028] When the piston 33 is inserted into the cylinder 31, it divides the inside of the cylinder 31 into an extension chamber R1 and a compression chamber R2, both filled with liquid, and can move axially within the cylinder 31 together with the piston rod 32. The liquid filling the extension chamber R1 and the compression chamber R2 is, for example, hydraulic fluid, but it may also be a liquid other than hydraulic fluid.

[0029] Furthermore, as shown in Figure 1, the piston 33 is equipped with an extension damping passage 33a and a compression damping passage 33b that penetrate along the axial direction, and is inserted into the cylinder 31 so as to be movable in the axial direction, dividing the inside of the cylinder 31 into an extension chamber R1 and a compression chamber R2. In this way, the extension chamber R1, which is divided inside the cylinder 31 by the piston 33, is in communication with the annular gap between the cylinder 31 and the outer tube 37 through a hole 31a provided in the cylinder 31.

[0030] In the buffer D of this embodiment, the extension damping valve 34 is constructed by stacking multiple annular plates, with its inner circumference fixed to the outer circumference of the small-diameter portion 32a of the piston rod 32 and stacked on the upper end of the piston 33 in Figure 2, forming a stacked leaf valve. The inner circumference is fixed to the piston rod 32, and the outer circumference is allowed to bend. Therefore, the extension damping valve 34 has its outer circumference as a free end and is stacked on the piston 33 to close the extension damping passage 33a. When the outer circumference is bent to open the extension damping passage 33a, it provides resistance to the flow of liquid from the extension chamber R1 to the compression chamber R2 while opening the extension damping passage 33a.

[0031] In the buffer D of this embodiment, the compression damping valve 35 is constructed by stacking multiple annular plates, with its inner circumference fixed to the outer circumference of the small-diameter portion 32a of the piston rod 32 and stacked on the lower end of the piston 33 in Figure 2, forming a stacked leaf valve. The inner circumference is fixed to the piston rod 32, and the outer circumference is allowed to bend. Therefore, the compression damping valve 35 has its outer circumference as a free end and is stacked on the piston 33 to close the compression damping passage 33b. When the outer circumference is bent to open the compression damping passage 33b, it provides resistance to the flow of liquid from the compression chamber R2 to the extension chamber R1 while opening the compression damping passage 33b.

[0032] The compression damping valve 35, piston 33, and rebound damping valve 34 configured in this way are then assembled in order to the outer circumference of the small-diameter portion 32a of the piston rod 32, and then fixed to the piston rod 32 by a piston nut 44 which is screwed onto the tip of the small-diameter portion 32a.

[0033] Next, the upper cap 38 that closes the upper part of the cylinder 31 in Figure 1 comprises a cap portion 38a that is attached to the upper end of the cylinder 31 in Figure 1, a cylindrical housing 38b that houses the solenoid valve V, and a connecting portion 38c that extends horizontally from the side of the cap portion 38a in Figure 1 and is connected to the housing 38b.

[0034] The cap portion 38a is a top-shaped cylindrical part having a top portion 38a1 and a cylindrical portion 38a2, and includes a stepped portion 38a3 formed on the inner circumference of the cylindrical portion 38a2 on the top side and abutting against the upper end of the cylinder 31 in Figure 1, and a threaded portion 38a4 formed on the lower side of the inner circumference of the cylindrical portion 38a2 in Figure 1 and screw-connected to the threaded portion 37a of the outer tube 37, thereby closing the upper end of the cylinder 31 and the upper end of the outer tube 37, and also includes a bracket 38a5 above the top portion 38a1 in Figure 1 that can be connected to the body of a vehicle not shown.

[0035] A flange 31b is provided on the outer circumference of the upper end of the cylinder 31, which abuts against the stepped portion 38a3 of the cap portion 38a. An O-ring 31c fitted on the outer circumference of the flange 31b is tightly attached to the inner circumference of the cylindrical portion 38a2 of the cap portion 38a, preventing the annular gap between the cylinder 31 and the outer tube 37 from communicating with the compression chamber R2 through the gap between the cylinder 31 and the stepped portion 38a3. Then, the cylinder 31 is inserted into the cap portion 38a until its upper end contacts the stepped portion 38a3. The outer tube 37 is then screwed into the cap portion 38a, and its upper end contacts the flange 31b of the cylinder 31. When the outer tube 37 is tightened, the screw connection between the threaded portion 37a and the threaded portion 38a4 fixes the outer tube 37 to the cap portion 38a. At the same time, the cylinder 31 is sandwiched between the upper end of the outer tube 37 and the stepped portion 38a3, and the cylinder 31 is also fixed to the cap portion 38a.

[0036] Furthermore, as shown in Figure 1, a hose 45 connected to the tank 36 is attached to the cap portion 38a, and the pressure side chamber R2 is in communication with the inside of the tank 36 through the hose 45. In this embodiment, the tank 36 consists of a top-cylindrical body 36a, a cap 36b that closes the opening of the body 36a, and inside the body 36a toThe tank 36 is equipped with a free piston 36c that is housed so as to be movable in the axial direction and divides the inside of the tank 36 into a liquid chamber L and an air chamber G. In this embodiment, the inside of the tank 36 is divided into a liquid chamber L and an air chamber G by the free piston 36c, but instead of the free piston 36c, a flexible elastic partition such as a diaphragm or bladder or a bellows may be used to divide the inside of the liquid chamber L and the air chamber G. At the top of the main body 36a of the tank 36, a damping passage 46 and a suction passage 47 are provided, which connect the liquid chamber L to the pressure side chamber R2 in the cylinder 31 via a hose 45. A pressure side main damping valve 48 is installed in the damping passage 46 to resist the flow of liquid from the pressure side chamber R2 to the liquid chamber L, and a suction check valve 49 is installed in the suction passage 47 to allow only the flow of liquid from the liquid chamber L to the pressure side chamber R2.

[0037] Returning to the main point, the connecting portion 38c protrudes horizontally from the side of the cap portion 38a to the left in Figure 1 and is integrally connected to the housing 38b which is located below the tip.

[0038] The housing 38b is cylindrical and integral with the lower end of the connecting portion 38c, and is equipped with a valve hole 38b1 that opens from the lower side in Figures 1 and 2. The valve hole 38b1 has a small diameter portion on the inner side and is equipped with a large diameter portion 38b2 on the opening side and a small diameter portion 38b3 on the inner side. Furthermore, a screw groove is provided on the inner circumference of the large diameter portion 38b2 of the valve hole 38b1 of the housing 38b, on the side of the small diameter portion 38b3.

[0039] The valve hole 38b1 is provided in the connecting portion 38c and communicates with the compression chamber R2 in the cylinder 31 through a passage 38c1 that opens from the upper end in Figure 2, which is the bottom 38b4 of the valve hole 38b1, and opens to the inner circumference of the cylindrical portion 38a2 of the cap portion 38a. The valve hole 38b1 is also communicated with the extension chamber R1 through a passage 38c2 provided in the connecting portion 38c and opening from the large diameter portion 38b2 of the valve hole 38b1, and opens to the inner circumference of the cylindrical portion 38a2 of the cap portion 38a, a hole 37b in the outer tube 37, an annular gap between the cylinder 31 and the outer tube 37, and a hole 31a in the cylinder 31. In this way, the valve hole 38b1 is communicated with the extension chamber R1 and the compression chamber R2 through passages 38c1 and 38c2.

[0040] A solenoid valve V is mounted in the housing 38b. As described above, the solenoid valve V comprises a bottomed cylindrical cap 1 attached to the opening of the valve hole 38b1 of the housing 38b, a solenoid S housed inside the cap 1, a valve seat member 2 having a port 2a and housed inside the valve hole 38b1, a valve body 3 that can open and close the port 2a in the valve seat member 2 and is driven by the solenoid S, and a bottomed cylindrical case 4 that houses the valve seat member 2 and the valve body 3 inside.

[0041] As shown in Figure 2, the cap 1 is a bottomed cylindrical shape comprising a bottom portion 1a and a cylindrical portion 1b rising from the outer circumference of the bottom portion 1a. It has a through hole 1a1 that penetrates the center of the bottom portion 1a, a threaded portion 1b1 formed on the outer circumference of the upper end of the cylindrical portion 1b in Figure 2, and an annular groove 1b2 formed on the outer circumference of the cylindrical portion 1b directly below the threaded portion 1b1. An O-ring 50 is fitted inside the annular groove 1b2 of the cap 1. Furthermore, an annular groove 1b3 is formed along the circumferential direction on the inner circumference of the upper end side of the cylindrical portion 1b of the cap 1, into which a C-shaped retaining ring 6 is fitted.

[0042] Next, as shown in Figure 2, the solenoid S comprises a frame 60 formed of a bottomed cylindrical magnetic material, a cylindrical coil 61 housed within the frame 60, a bottomed cylindrical first fixed core 62 inserted into the coil 61 and into the bottom side of the frame 60, a cylindrical second fixed core 63 inserted into the coil 61 from the open end side of the frame 60, with an annular spacer 68 forming an air gap together with the first fixed core 62, a movable core 64 housed inside the first fixed core 62 between the first fixed core 62 and the second fixed core 63 and attracted toward the second fixed core 63 when the coil 61 is energized, and a push rod 65 connected to the movable core 64 and movably inserted into the second fixed core 63.

[0043] The coil 61 is housed inside the frame 60 and can receive current via a cable 66 inserted through a hole 60a in the bottom of the frame 60 and a through hole 1a1 in the bottom 1a of the cap 1, and connected to an external power source (not shown).

[0044] The first fixed core 62 is a bottomed cylindrical shape, with its bottom facing the bottom of the frame 60 and its cylindrical portion facing the opening of the frame 60, and is inserted into the inner circumference of the coil 61. The second fixed core 63 is also cylindrical and is inserted into the coil 61 on the opening side of the frame 60, further than the first fixed core 62, with its end face facing the cylindrical portion of the first fixed core 62 with a gap between them.

[0045] The second fixed core 63 is cylindrical and has an annular projection 63a on the outer circumference of its lower end in Figure 2 that faces the cylindrical portion of the first fixed core 62 in the axial direction, a flange 63b provided on the outer circumference of the open end side of the frame 60 that fits onto the inner circumference of the cylindrical portion of the frame 60, and an annular recess 63c provided on the inner circumference of the upper end in Figure 2. Furthermore, an annular groove 63b1 for accommodating an O-ring 67 is provided on the outer circumference of the flange 63b of the second fixed core 63, so that when the second fixed core 63 is inserted into the frame 60, the O-ring 67 comes into close contact with the inner circumference of the cylindrical portion of the frame 60, sealing the space between the second fixed core 63 and the frame 60.

[0046] The movable core 64 is slidably inserted into the cylindrical portion of the first fixed core 62 and positioned between the first fixed core 62 and the second fixed core 63. In a state where it is seated on the bottom of the first fixed core 62, the outer circumference of the side end facing the second fixed core is slightly radially opposed to the annular projection 63a of the second fixed core 63.

[0047] Therefore, a magnetic path is formed by the frame 60, the first fixed core 62, the movable core 64, and the second fixed core 63. When current is supplied to the coil 61, the movable core 64 is attracted to the second fixed core 63 and attempts to move in a direction that increases the area of ​​contact with the annular protrusion 63a, thereby biasing the push rod 65 in a direction that causes it to retract from the frame 60.

[0048] The valve seat member 2 is cylindrical and has four ports 2a spaced apart along the circumferential direction that communicate the inside and outside. It is fitted without play into the annular recess 63c of the second fixed core 63 and is radially centered by the solenoid S.

[0049] The valve body 3 is a bottomed cylindrical shape, with its outer circumference sliding against the inner circumference of the valve seat member 2. Its axial length is shorter than that of the valve seat member 2, and it is permitted to move axially within the valve seat member 2. The valve body 3 has a hole 3a at its bottom, as well as four ports 3b that communicate inside and outside, arranged circumferentially and spaced apart along the cylindrical portion. When viewed from the axial direction, the valve seat member 2 and the valve body 3 are positioned in the same phase in the circumferential direction, with ports 2a and 3b being the same phase. When the bottom of the valve body 3 contacts the bottom surface of the annular recess 63c of the second fixed core 63 in the solenoid S, the ports 3b are positioned lower in Figure 2 than the ports 2a of the valve seat member 2. As the valve body 3 moves upward in Figure 2 from the position where its bottom contacts the second fixed core 63 relative to the valve seat member 2, the ports 3b eventually come into contact with the ports 2a, and when they are at exactly the same height, they face each other and their degree of overlap is maximized.

[0050] Therefore, by moving the valve body 3 axially within the valve seat member 2, the communication state between port 2a and port 3b can be changed from a state in which port 2a is completely closed to a state in which port 2a is fully open. The bottom of the valve body 3 faces the second fixed iron core 63 of the solenoid S and can contact the push rod 65, so by supplying current to the coil 61 of the solenoid S, the valve body 3 can be pressed and its position relative to the valve seat member 2 can be changed. Although there are four ports 2a and four ports 3b, the number of ports can be arbitrarily changed as long as the number is the same, and the shapes of ports 2a and 3b can also be arbitrarily changed.

[0051] Case 4 is a bottomed cylindrical shape and includes a hole 4b provided in the bottom 4a, a flange 4d provided on the outer circumference of the tip of the cylindrical portion 4c, an annular projection 4e provided on the outer circumference of the flange 4d at the lower end in Figure 2 and projecting radially outward, four notches 4f that pass through both the flange 4d and the annular projection 4e radially and lead into the cylindrical portion 4c, and an annular groove 4g provided on the outer circumference of the upper end of the cylindrical portion 4c in Figure 2.

[0052] In case 4, the inner diameter of the cylindrical portion 4c is larger than the outer diameter of the valve seat member 2. When the valve seat member 2 is housed in the cylindrical portion 4c, a gap is provided between the cylindrical portion 4c and the valve seat member 2, creating sufficient play.

[0053] Furthermore, the outer diameter of the annular projection 4e, which has the largest outer diameter of case 4, is smaller than the inner diameter of the cylindrical portion 1b of cap 1. When case 4 is inserted into cap 1, case 4 is loosely fitted inside cap 1, allowing it to move in the axial direction.

[0054] Then, when the case 4 is inserted into the cap 1 from the annular projection 4e side, and the annular projection 4e is positioned below the annular groove 1b3 inside the cap 1, and the retaining ring 6 is fitted into the annular groove 1b3, the inner diameter of the retaining ring 6 is smaller than the outer diameter of the annular projection 4e and larger than the outer diameter of the flange 4d, so the case 4 is temporarily fixed by the retaining ring 6, preventing it from falling off the cap 1 while allowing axial movement relative to the cap 1.

[0055] The case 4 houses the valve seat member 2, valve body 3, and coil spring 5. The case 4 is temporarily assembled to the cap 1 by a retaining ring 6, along with the valve seat member 2, valve body 3, and coil spring 5 housed inside. When the annular projection 4e abuts against the retaining ring 6, restricting the case 4 from moving out of the cap 1, a gap is created between the upper end of the valve seat member 2, whose lower end in Figure 2 abuts against the bottom of the annular recess 63c of the second fixed core 63 of the solenoid S, and the bottom 4a of the case 4. Furthermore, when the upper end of the valve seat member 2 in Figure 2 abuts against the inner surface of the bottom 4a of the case 4, a gap is created between the lower end of the flange 4d in Figure 2 of the case 4 and the frame 60 and second fixed core 63 of the solenoid S, so that the lower end of the flange 4d in Figure 2 does not abut against the frame 60 and second fixed core 63. Therefore, when the case 4, which houses the valve seat member 2, is temporarily fastened to the cap 1, which houses the solenoid S, by the retaining ring 6, the case 4 can move slightly in the axial direction.

[0056] Furthermore, as mentioned above, the inner diameter of the cylindrical portion 4c in case 4 is larger than the outer diameter of the valve seat member 2. When the valve seat member 2 is housed in case 4 and temporarily fastened to cap 1 with retaining ring 6, even if there is a misalignment between the axis of the valve seat member 2, which is radially aligned by the solenoid S, and case 4, case 4 does not interfere with the valve seat member 2 and does not affect the radial position of the valve seat member 2 relative to the solenoid S.

[0057] Furthermore, the inner diameter of the inner circumference of the valve seat member 2 of the cylindrical portion 4c of case 4 that faces the port 2a is made sufficiently larger than the outer circumference of the valve seat member 2 so as not to create resistance when liquid passes through the annular gap between the inner circumference of the valve seat member 2 of the cylindrical portion 4c that faces the port 2a and the outer circumference of the valve seat member 2.

[0058] Next, the inner diameter of the hole 4b in the bottom 4a of case 4 is smaller than the inner diameter of the valve body 3, allowing a coil spring 5 to be interposed between the bottom 4a and the valve body 3. The coil spring 5 is compressed and sandwiched between the upper end of the cylindrical part of the valve body 3 in Figure 2 and the bottom 4a of case 4, constantly biasing the valve body 3 and the movable core 64 downward in Figure 2. When there is no current supplied to the solenoid S and the solenoid S does not provide thrust to the valve body 3, the coil spring 5 causes the valve body 3 to contact the second fixed core 63 and the movable core 64 to contact the bottom of the first fixed core 62. Four notches 4f are provided at equal intervals in the circumferential direction of case 4, ensuring communication between the inside and outside of case 4 even after case 4 is assembled to cap 1. The number of notches 4f can be arbitrarily changed. Furthermore, an O-ring 70 is housed in an annular groove 4g provided on the outer circumference of the cylindrical portion 4c of case 4.

[0059] The solenoid valve V, configured as described above, is assembled to the housing 38b as follows. First, the solenoid S is inserted into the cap 1 from the bottom side of the frame 60 with the push rod 65 facing outwards. At the same time, the cable 66 is pulled out from the hole 60a while the solenoid S is housed inside the cap 1.

[0060] Next, the valve seat member 2 is inserted into the case 4, and the coil spring 5 is inserted into the inner circumference of the valve seat member 2 on the back side of the case 4. Then, the valve body 3 is inserted into the valve seat member 2 from the cylindrical side, and the valve seat member 2, coil spring 5, and valve body 3 are housed in the case 4.

[0061] Then, the case 4, which houses the valve seat member 2, the coil spring 5, and the valve body 3, is inserted from the cylindrical portion 4c side into the cylindrical portion 1b of the cap 1 that houses the solenoid S, until the annular projection 4e passes through the annular groove 1b3 provided on the inner circumference of the cylindrical portion 1b and enters the cap 1.

[0062] After inserting the case 4 into the cap 1, the retaining ring 6 is inserted into the gap between the cylindrical portion 1b of the cap 1 and the cylindrical portion 4c of the case 4. The retaining ring 6 is then pushed into the cap 1 while its diameter is reduced, and the retaining ring 6 is inserted into the annular groove 1b3. Once inserted into the annular groove 1b3, the retaining ring 6 expands in diameter due to its own restoring force and is fixed within the annular groove 1b3. Once the retaining ring 6 is fixed to the cap 1, the case 4 is temporarily fixed to the cap 1, housing the valve seat member 2, valve body 3, and coil spring 5 inside, while still being able to move slightly vertically relative to the cap 1, and without affecting the radial alignment of the valve seat member 2 by the solenoid S.

[0063] Furthermore, when the case 4 is temporarily attached to the cap 1, the solenoid S, valve seat member 2, valve body 3, and coil spring 5, which constitute the solenoid valve V, are integrated within the cap 1 and case 4 without falling apart, so all the components that make up the solenoid valve V can be assembled together as a single unit.

[0064] When the assembled solenoid valve V is inserted into the valve hole 38b1 of the housing 38b, the case 4 fits into the small-diameter portion 38b3 of the valve hole 38b1. Then, as the threaded portion 1b1 provided on the outer circumference of the cylindrical portion 1b of the cap 1 is screwed into the threaded groove provided on the inner circumference of the large-diameter portion 38b2 of the valve hole 38b1, the bottom portion 4a of the case 4 eventually comes into contact with the bottom portion 38b4 of the valve hole 38b1.

[0065] Since the case 4 and the cap 1 can move relative to each other in the axial direction, and the case 4 is in contact with the bottom 38b4 of the valve hole 38b1, further screwing in the cap 1 causes the cap 1 to move toward the bottom 38b4 of the valve hole 38b1, and the cap 1, solenoid S, valve seat member 2, and case 4 are sandwiched between the cap 1 and the bottom 38b4 of the housing 38b and fixed to the housing 38b. Furthermore, since the axial force acting on the solenoid S, valve seat member 2, and case 4 can be adjusted according to the tightening torque of the cap 1 toward the housing 38b, the assembly of the solenoid valve V becomes easier compared to a conventional solenoid valve structure with screw connections in two places.

[0066] When the solenoid valve V is assembled to the housing 38b in this manner, the hole 4b in the bottom 4a of the case 4 faces the passage 38c1 that opens to the bottom 38b4, and the inside of the valve body 3 housed in the case 4 communicates with the pressure chamber R2 in the cylinder 31 through the passage 38c1. Furthermore, the axial length of the cylindrical portion 4c of the case 4 is longer than the axial length of the small diameter portion 38b3 of the valve hole 38b1, and the case 4 protrudes from the small diameter portion 38b3 into the large diameter portion 38b2. The case 4 has a notch 4f that opens from the flange 4d and leads inward even when inserted into the cap 1, and the annular gap between the case 4 and the outer circumference of the valve seat member 2, facing the port 2a, communicates with the passage 38c2 that opens to the large diameter portion 38b2 of the valve hole 38b1 through the notch 4f. As described above, the passage 38c2 is in communication with the extension chamber R1 via the hole 37b in the outer tube 37, the annular gap between the cylinder 31 and the outer tube 37, and the hole 31a in the cylinder 31.

[0067] Therefore, when the port 2a of the valve seat member 2 and the port 3b of the valve body 3 face each other, the extension side damping passage 33a and the compression side damping passage 33b are bypassed, and the extension side chamber R1 and the compression side chamber R2 are connected through the case 4. When the port 2a of the valve seat member 2 and the outer circumference of the valve body 3 face each other, the connection between the extension side chamber R1 and the compression side chamber R2 through the case 4 is severed.

[0068] Thus, the solenoid valve V is provided in a bypass passage that bypasses the extension damping passage 33a and the compression damping passage 33b. When the port 3b of the valve body 3 faces the port 2a of the valve seat member 2, the bypass passage is opened, and when the outer circumference of the valve body 3 closes the port 2a of the valve seat member 2, the bypass passage is shut off. Therefore, in the non-energized state, when no current is supplied to the coil 61 of the solenoid S, the valve body 3 is biased by the coil spring 5 and contacts the second fixed iron core 63, causing its outer circumference to face the port 2a of the valve seat member 2 and shutting off the bypass passage. When current is supplied to the coil 61 and the thrust of the solenoid S moves the valve body 3 toward the bottom 4a side of the case 4 against the biasing force of the coil spring 5, the port 3b faces the port 2a and the bypass passage is opened. Furthermore, since the amount of movement of the valve body 3 toward the bottom 4a is proportional to the magnitude of the thrust that the solenoid S imparts to the valve body 3, the degree to which ports 2a and 3b face each other, that is, the degree of opening of the solenoid valve V, can be adjusted by adjusting the amount of current supplied to the coil 61.

[0069] Furthermore, when the case 4 is housed in the valve hole 38b1, the O-ring 70 provided on the outer circumference of the case 4 adheres tightly to the wall surface forming the small-diameter portion 38b3 of the valve hole 38b1, so that the extension chamber R1 and the compression chamber R2 do not communicate with each other by bypassing the solenoid valve V through the space between the case 4 and the small-diameter portion 38b3. Also, the O-ring 50 fitted on the outer circumference of the cylindrical portion 1b of the cap 1 adheres tightly to the inner circumference of the opening side of the large-diameter portion 38b2 that does not have a screw thread, so that liquid does not leak from between the cap 1 and the housing 38b. The O-ring 70 provided on the outer circumference of the case 4 adheres tightly to the bottom 4a of the case 4, the housing 38a, and the valve hole 38b1 This step may be omitted if sealing is achieved by abutting with the bottom portion 38b4.

[0070] The buffer D, which utilizes the solenoid valve V configured in this way, operates as follows: During the extension stroke of the buffer D, in which the piston 33 moves downward in Figure 1 relative to the cylinder 31, if the solenoid valve V is closed, the liquid in the extension chamber R1, which is compressed by the piston 33, moves to the compression chamber R2 via the extension damping passage 33a. During this extension stroke, if the solenoid valve V is closed, the buffer D uses the extension damping valve 34 to resist the flow of liquid, increasing the pressure in the extension chamber R1 and generating an extension damping force that hinders extension.

[0071] Furthermore, during the extension stroke of the buffer D, the piston rod 32 retracts from the cylinder 31, resulting in a shortage of liquid in the pressure chamber R2 equivalent to the volume lost when the piston rod 32 retracts from the cylinder 31. This shortage is compensated for by opening the suction check valve 49, which supplies liquid from the liquid chamber L in the tank 36 to the pressure chamber R2.

[0072] Furthermore, when the solenoid valve V is opened, the liquid moves from the extension chamber R1 to the compression chamber R2, passing through the solenoid valve V in addition to the extension damping valve 34. Therefore, the damping force during the extension operation of the buffer D can be adjusted to a high or low level depending on the degree of opening of the solenoid valve V.

[0073] On the other hand, during the contraction stroke of the shock absorber D, in which the piston 33 moves upward in Figure 1 relative to the cylinder 31, the liquid in the compression chamber R2 compressed by the piston 33 moves to the extension chamber R1 via the compression damping passage 33b, opening the compression damping valve 35. Also, during the contraction stroke of the shock absorber D, the piston rod 32 enters the cylinder 31, resulting in an excess of hydraulic fluid in the cylinder 31 equal to the volume of the piston rod 32 that enters the cylinder 31. This excess liquid moves from the compression chamber R2 to the extension chamber R1 via the compression main damping valve 48.

[0074] Thus, during the contraction stroke, when the solenoid valve V is closed, the buffer D provides resistance to the liquid flow through the pressure-side damping valve 35 and the pressure-side main damping valve 48, increasing the pressure in the pressure-side chamber R2 and generating a pressure-side damping force that hinders contraction.

[0075] Furthermore, when the solenoid valve V is opened, the liquid moves from the compression chamber R2 to the extension chamber R1, passing through the solenoid valve V in addition to the compression damping valve 35. Therefore, the damping force during the contraction operation of the buffer D can be adjusted to a high or low level depending on the degree of opening of the solenoid valve V.

[0076] As described above, the solenoid valve V comprises a bottomed cylindrical cap 1 attached to the opening of a valve hole 38b1 that opens from one end of a housing 38b, a solenoid S housed inside the cap 1, a valve seat member 2 having a port 2a and housed inside the valve hole 38b1, and centered radially on the solenoid S by the solenoid S, and a valve body 3 that can open and close the port 2a of the valve seat member 2 and is driven by the solenoid S, with the solenoid S and the valve seat member 2 being sandwiched between the bottom 38b4 of the valve hole 38b1 of the housing 38b and the cap 1 and fixed to the housing 38b.

[0077] In the solenoid valve V configured in this way, by attaching the cap 1 to the housing 38b, the solenoid S and the valve seat member 2 can be clamped and fixed between the cap 1 and the bottom 38b4 of the valve hole 38b1 in the housing 38b, and the valve seat member 2 is aligned with respect to the solenoid S. Therefore, fixing the valve seat member 2 to the cap 1 and aligning the valve seat member 2 with respect to the solenoid S can be achieved without using multiple screw connections, and the solenoid valve V can be fixed to the housing 38b without using multiple screw connections as in conventional solenoid valves.

[0078] As described above, with the solenoid valve V of this embodiment, the solenoid valve V can be fixed to the housing 38b without using screw connections in multiple places, making the assembly of the solenoid valve V easier. Furthermore, if screw connections are used, they only need to be in one place between the cap 1 and the housing 38b, thus reducing the possibility of loosening and enabling miniaturization compared to conventional solenoid valves.

[0079] Furthermore, the solenoid valve V of this embodiment includes a bottomed cylindrical case 4 that houses a valve seat member 2 and a valve body 3 inside, and a retaining ring (temporary fixing member) 6 that temporarily fixes the case 4 to the cap 1 in a state that allows axial movement, and the solenoid S and the valve seat member 2 are sandwiched between the bottom 38b4 of the valve hole 38b1 of the housing 38b and the cap 1 via the case 4.

[0080] In the solenoid valve V configured in this way, the case 4 is temporarily fixed to the cap 1, and the solenoid S, valve seat member 2, and valve body 3 are housed in the cap 1 and case 4 and assembled. This improves the ease of assembly of the solenoid valve V to the housing 38b, making assembly even easier. Furthermore, since the case 4 is allowed to move axially relative to the cap 1, fixing the cap 1 to the housing 38b allows axial force to be applied to the solenoid S, valve seat member 2, and case 4, thereby fixing them in place.

[0081] In the solenoid valve V shown in Figures 1 and 2, a case 4 is provided, and the solenoid valve V is assembled by temporarily fastening the case 4 to the cap 1. However, the case 4 may be eliminated, and the solenoid valve V may be assembled without assembly. The valve seat member 2 may be radially centered by the solenoid S, and the valve seat member 2, which houses the solenoid S and the valve body 3, may be sandwiched between the cap 1 and the bottom 38b4 of the valve hole 38b1 by attaching the cap 1 to the housing 38b. If it is desired to assemble the solenoid valve V1 even without the case 4, as shown in Figure 3, a flange 2b that is loosely fitted to the inner circumference of the cap 1 may be provided on the outer circumference of the valve seat member 2, and the valve seat member 2 may be temporarily fastened with a retaining ring 6 to prevent the valve seat member 2 from falling off the cap 1. In this case, when the valve body 3 is biased by the coil spring 5, an annular spring support 2c supporting one end of the coil spring 5 should be provided on the inner circumference of the anti-solenoid end of the valve seat member 2.

[0082] Furthermore, in this embodiment, the valve seat member 2 and valve body 3 in the solenoid valve V are both cylindrical and configured as a spool valve that moves relative to each other in the axial direction to open and close the port 2a. However, the valve seat member 2 does not have to be cylindrical as long as it is radially centered by the solenoid S, and the valve body 3 may also be a valve body other than a spool. For example, if the valve seat member 2 has a port at its bottom, the valve body 3 may be a poppet that is driven axially by the solenoid S relative to the valve seat member 2 to open and close the port, and the valve seat member 2 and the valve body 3 may constitute a poppet valve. Also, in this embodiment, a coil spring 5 is provided, but if the valve body 3 is connected to the push rod 65 of the solenoid S, and the solenoid S itself has a spring that returns the movable iron core 64 to its non-energized position, the coil spring 5 in the valve seat member 2 may be omitted. Furthermore, in this case, if case 4 is abolished and the valve seat member 2 is temporarily fixed to cap 1, the valve body 3 is connected to the push rod 65 and will not fall out of the valve seat member 2, so the valve seat member 2 can be made into a simple cylindrical shape and it is not necessary to provide a flange on the inner circumference of the end opposite the solenoid to prevent the valve body 3 from falling out.

[0083] Furthermore, in the solenoid valve V of this embodiment, the temporary fastening member is a retaining ring 6 fixed to the inner circumference of the cap 1. With the solenoid valve V configured in this way, the assembly of the solenoid valve V becomes even easier by using a retaining ring 6 that is easy to attach to the inner circumference of the cap 1. In addition, by temporarily fastening with the retaining ring 6, even if a force is applied to pull the case 4 out of the cap 1, the case 4 can be prevented from falling out of the cap 1. Moreover, since the retaining ring 6 restricts the removal of the case 4 from the cap 1, it does not interfere with the movement of the case 4 in the direction of entering the back of the cap 1, so the case 4 and the retaining ring 6 do not create resistance when attaching the cap 1 to the housing 38b.

[0084] In this invention, the temporary fastening of case 4 to cap 1 means that the state in which case 4 is inserted into cap 1 can be maintained while allowing axial movement of case 4. The temporary fastening member is not limited to the retaining ring 6, but may also be a rubber ring provided on one of the inner circumference of cap 1 and the outer circumference of case 4, and in close contact with the other inner circumference of cap 1 and the outer circumference of case 4. Alternatively, when case 4 is inserted into cap 1, friction between cap 1 and case 4 can prevent case 4 from falling out of cap 1, while if a force greater than the frictional force is applied to cap 1, case 4 may be temporarily fastened to cap 1 by fitting so that case 4 can move axially relative to cap 1. In this case, the temporary fastening member would be case 4 itself.

[0085] Furthermore, the manufacturing method of the solenoid valve V of this embodiment comprises a bottomed cylindrical cap 1 attached to the opening of a valve hole 38b1 on a housing 38b having a valve hole 38b1 that opens from one end, a solenoid S housed inside the cap 1, a valve seat member 2 having a port 2a and housed inside the valve hole 38b1 and centered radially on the solenoid S by the solenoid S, a valve body 3 that can open and close the port 2a on the valve seat member 2 and is driven by the solenoid S, and a bottomed cylindrical case 4 that houses the valve seat member 2 and the valve body 3 inside, and comprises the steps of housing the solenoid S inside the cap 1, housing the valve seat member 2 and the valve body 3 inside the case 4, inserting the case 4 into the cap 1 and temporarily fixing the case 4 to the cap 1, and inserting the cap 1 with the case 4 temporarily fixed into the valve hole 38b1 and connecting the cap 1 to the housing 38b.

[0086] According to the manufacturing method for the solenoid valve V configured in this way, the solenoid valve V can be manufactured simply by providing a screw connection between the cap 1 and the housing 38b, which reduces the possibility of loosening, makes assembly easy and allows for miniaturization. In addition, by temporarily fixing the case 4 to the cap 1, each component of the solenoid valve V can be assembled together, making the assembly work of the solenoid valve V easier.

[0087] Furthermore, in the case of the solenoid valve V1 in which case 4 is eliminated, the step of housing the valve seat member 2 and valve body 3 inside case 4 is eliminated, and instead of the step of temporarily fixing case 4 to cap 1, a step of temporarily fixing the valve seat member 2 housing the valve body 3 to cap 1 is provided. With the manufacturing method of the solenoid valve V1 configured in this way, the solenoid valve can be manufactured simply by providing a screw connection between cap 1 and housing 38b. V1 Because it can be manufactured in this way, the possibility of loosening is reduced, assembly is easier and miniaturization is possible. In addition, by temporarily fixing the valve seat member 2 to the cap 1, all the parts of the solenoid valve V1 can be assembled together, making the assembly work of the solenoid valve V1 easier.

[0088] Although preferred embodiments of the present invention have been described in detail above, modifications, alterations, and changes are permitted as long as they do not deviate from the scope of the claims. [Explanation of Symbols]

[0089] 1...Cap, 2...Valve seat member, 2a...Port, 3...Valve body, 4...Case, 6...Retaining ring (temporary fastening member), 38b...Housing, 38b1...Valve hole, 38b4...Bottom, S...Solenoid, V...Solenoid valve

Claims

1. A bottomed cylindrical cap is attached to the opening of a valve hole that opens from one end of a housing, A solenoid housed within the aforementioned cap, A valve seat member having a port and housed within the valve hole, and being centered radially in the direction of the solenoid by the solenoid, A valve body that can open and close the port in the valve seat member and is driven by the solenoid, The valve seat member is provided with a temporary fixing member that temporarily fixes the valve seat member in a state that allows axial movement relative to the cap, The solenoid and the valve seat member are sandwiched between the bottom of the valve hole in the housing and the cap, and fixed to the housing. A solenoid valve characterized by the following features.

2. A bottomed cylindrical cap is attached to the opening of a valve hole that opens from one end of a housing, A solenoid housed within the aforementioned cap, A valve seat member having a port and housed within the valve hole, and being centered radially in the direction of the solenoid by the solenoid, A valve body that can open and close the port in the valve seat member and is driven by the solenoid, A bottomed cylindrical case that houses the valve seat member and the valve body inside, The case is provided with a temporary fixing member that temporarily fixes the case to the cap in a state that allows axial movement, The solenoid and the valve seat member are held in place by the bottom of the valve hole in the housing and the cap via the case, and are fixed to the housing. A solenoid valve characterized by the following features.

3. The temporary fastening member is a retaining ring fixed to the inner circumference of the cap. The solenoid valve according to claim 1 or 2, characterized by the above.

4. A method for manufacturing a solenoid valve comprising: a bottomed cylindrical cap attached to the opening of a valve hole that opens from one end of a housing; a solenoid housed inside the cap; a valve seat member having a port and housed inside the valve hole, and centered radially in the direction of the solenoid by the solenoid; a valve body that can open and close the port in the valve seat member and is driven by the solenoid; and a bottomed cylindrical case that houses the valve seat member and the valve body internally, The steps include housing the solenoid inside the cap, The steps include housing the valve seat member and the valve body within the case, The steps include inserting the case into the cap and temporarily securing the case to the cap, The process includes inserting the cap, which is temporarily fixed to the case, into the valve hole and joining the cap to the housing. A method for manufacturing a solenoid valve, characterized by the following:

5. A method for manufacturing a solenoid valve comprising: a bottomed cylindrical cap attached to the opening of a valve hole that opens from one end of a housing; a solenoid housed inside the cap; a bottomed cylindrical valve seat member having a port and housed inside the valve hole, and centered radially to the solenoid by the solenoid; and a valve body that can open and close the port in the valve seat member and is driven by the solenoid, wherein The steps include housing the solenoid inside the cap, The step of housing the valve body within the valve seat member, The steps include inserting the valve seat member into the cap and temporarily securing the valve seat member to the cap, The process includes inserting the cap, on which the valve seat member is temporarily fixed, into the valve hole and joining the cap to the housing. A method for manufacturing a solenoid valve, characterized by the following:

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