CN112443698B

CN112443698B - Pilot-operated electromagnetic valve

Info

Publication number: CN112443698B
Application number: CN202010903472.3A
Authority: CN
Inventors: 伊藤新治
Original assignee: CKD Corp
Current assignee: CKD Corp
Priority date: 2019-09-04
Filing date: 2020-09-01
Publication date: 2022-05-31
Anticipated expiration: 2040-09-01
Also published as: JP2021042851A; TWI786433B; CN112443698A; TW202117218A; JP7088982B2

Abstract

Provided is a pilot-operated solenoid valve which can suppress leakage of a pilot fluid to the outside while securing high sealing performance, and which can increase the flow path cross-sectional area of a flow path. The fixing clip (70) has a pair of extending portions (70a), a closing portion (70b), and a bending portion (70 d). The pair of extending portions (70a) are fixed to the housing (11). The pair of extension portions (70a) is fixed to the housing (11), and the closing portion (70b) closes a flow path that is open to the 2 nd surface (442) in the valve body (60) of the 1 st pilot valve (41) in a state in which the 1 st pilot valve (41) and the 2 nd pilot valve (42) are sandwiched in cooperation with the housing (11). The bent portion urges the closing portion toward a 2 nd surface (442) of a valve body (60) of the 1 st pilot valve (41). A seal member is disposed between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve, and the seal member seals between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve.

Description

Pilot-operated electromagnetic valve

Technical Field

The invention relates to a pilot-operated electromagnetic valve.

Background

The pilot type solenoid valve has a spool that moves back and forth within a housing having a plurality of ports to switch communication between the ports. In the housing, a 1 st pilot pressure acting chamber and a 2 nd pilot pressure acting chamber are provided on the sides of both end portions of the spool, respectively. The pilot type electromagnetic valve has a 1 st pilot valve and a 2 nd pilot valve, the 1 st pilot valve supplies and discharges the pilot fluid to and from the 1 st pilot pressure operation chamber, and the 2 nd pilot valve supplies and discharges the pilot fluid to and from the 2 nd pilot pressure operation chamber. Further, the 1 st pilot valve supplies and discharges the pilot fluid to and from the 1 st pilot pressure operation chamber, and the 2 nd pilot valve supplies and discharges the pilot fluid to and from the 2 nd pilot pressure operation chamber, and the spool moves back and forth, and the communication between the ports can be switched.

As a wiring structure for supplying electric power to solenoids provided in the 1 st pilot valve and the 2 nd pilot valve, respectively, a plug-in (plug-in) structure is known. In the plug-in type structure, for example, the 1 st pilot valve and the 2 nd pilot valve are incorporated in a manifold block (manual block), and a connection terminal of the 1 st pilot valve and a connection terminal of the 2 nd pilot valve are connected to a connection terminal connected to a main power supply provided in the manifold block. Such a plug-in structure is aesthetically preferable because no wiring is exposed to the outside, and the wiring connection operation can be simplified.

Further, as disclosed in, for example, german patent No. 102007040929, a pilot type electromagnetic valve is known in which a 1 st pilot valve and a 2 nd pilot valve are arranged in a state of being connected to each other. The pilot type electromagnetic valve of this publication is a one-side solenoid type electromagnetic valve in which the 1 st pilot valve and the 2 nd pilot valve are collectively arranged on one side with respect to the housing. When the one-side solenoid type electromagnetic valve is of a plug-in type structure, it is easy to integrate a power supply structure such as a connection terminal of a manifold block at 1.

Documents of the prior art

Patent document

Patent document 1: german patent invention No. 102007040929

Disclosure of Invention

Problems to be solved by the invention

In the case of the one-side solenoid type electromagnetic valve as in the above-described publication, the 1 st pilot valve and the 2 nd pilot valve each have a rectangular block-shaped valve body having a 1 st surface and a 2 nd surface on the opposite side of the 1 st surface. Each valve body is arranged such that the 1 st surface of the valve body of the 1 st pilot valve abuts the 2 nd surface of the valve body of the 2 nd pilot valve, and the 1 st surface of the valve body of the 2 nd pilot valve abuts the housing. Here, a case where the flow path through which the pilot fluid flows, which is formed by the valve body of the 1 st pilot valve, is open to the 2 nd surface of the valve body of the 1 st pilot valve is examined. In this case, in order to prevent the pilot fluid flowing through the flow path opening to the 2 nd surface of the valve body of the 1 st pilot valve from leaking to the outside, it is necessary to close the flow path opening to the 2 nd surface of the valve body of the 1 st pilot valve while ensuring high sealability.

Further, it is desired to enlarge the flow path cross-sectional area of the flow path formed in each valve element. However, for example, when the 1 st pilot valve and the 2 nd pilot valve are fixed to the housing using screws, it is necessary to form screw insertion holes through which the screws are inserted in the respective valve bodies. Therefore, when the flow path cross-sectional area of the flow path of each valve element is to be enlarged, the screw insertion hole interferes with the flow path cross-sectional area of the flow path, and the enlargement of the flow path cross-sectional area of the flow path is restricted.

The purpose of the present invention is to provide a pilot-operated solenoid valve that can suppress leakage of a pilot fluid to the outside while ensuring high sealing performance, and that can increase the flow path cross-sectional area of a flow path.

Means for solving the problems

A pilot-operated solenoid valve for solving the above problems, which comprises a housing, a spool, a 1 st pilot pressure acting chamber and a 2 nd pilot pressure acting chamber, a 1 st pilot valve, and a 2 nd pilot valve; the housing has a plurality of ports; the spool moves back and forth within the housing, switching communication between the ports; the 1 st pilot pressure acting chamber and the 2 nd pilot pressure acting chamber are respectively provided on both end sides of the spool in the housing; the 1 st pilot valve supplies and discharges a pilot fluid to and from the 1 st pilot pressure acting chamber; the 2 nd pilot valve supplies and discharges a pilot fluid to and from the 2 nd pilot pressure acting chamber; the 1 st pilot valve and the 2 nd pilot valve are configured in an interconnected state; the 1 st pilot valve and the 2 nd pilot valve are respectively provided with a rectangular block-shaped valve body, and the valve body is provided with a 1 st surface and a 2 nd surface on the side opposite to the 1 st surface; the valve body is configured to: the 1 st surface of the valve body of the 1 st pilot valve abuts against the 2 nd surface of the valve body of the 2 nd pilot valve, and the 1 st surface of the valve body of the 2 nd pilot valve abuts against the housing; each of the valve bodies has a plurality of flow paths through which a pilot fluid flows; the plurality of flow paths include a flow path opening to the 2 nd surface of each of the valve bodies; the method is characterized in that: a fixing clip for fixing the 1 st pilot valve and the 2 nd pilot valve to the housing, the fixing clamp is provided with a pair of extending parts, a sealing part and a spring part, the extending parts are fixed on the shell and fixed on the shell through the extending parts, so that the closing portion sandwiches the 1 st pilot valve and the 2 nd pilot valve in cooperation with the housing, closing the flow path of the valve body of the 1 st pilot valve that is open to the 2 nd surface, the biasing portion biases the closing portion toward the 2 nd surface of the valve body of the 1 st pilot valve, a seal member is disposed between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve, the sealing member seals between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve.

Drawings

Fig. 1 is a sectional view showing a solenoid valve manifold according to embodiment 1.

Fig. 2 is an enlarged cross-sectional view of a housing and a manifold block of the solenoid valve manifold of fig. 1.

FIG. 3 is a cross-sectional view illustrating the 1 st and 2 nd pilot valves of the solenoid valve manifold of FIG. 1.

Fig. 4 is a perspective view schematically showing the 1 st and 2 nd pilot valves of fig. 3.

Fig. 5 is a sectional view of the flow passage forming block as viewed from the 1 st surface side.

Fig. 6 is a sectional view of the flow passage forming block as viewed from the 2 nd surface side.

FIG. 7 is a cross-sectional view of the 1 st and 2 nd pilot valves of FIG. 3.

Fig. 8 is a perspective view of the fixing clip of embodiment 1.

Fig. 9 is a perspective view partially showing the 1 st and 2 nd pilot valves of fig. 3.

Fig. 10 is a side view of the locking projection of the housing.

Fig. 11 is a perspective view showing a state in which the 1 st pilot valve and the 2 nd pilot valve of fig. 9 are fixed to the housing.

Fig. 12A is a cross-sectional view showing the distance between the bent portion and the connecting portion in a state before the fixing clip is fixed to the housing, that is, in the 1 st state.

Fig. 12B is a cross-sectional view showing the distance between the bent portion and the connecting portion in the 2 nd state, which is a state after the 1 st pilot valve and the 2 nd pilot valve are fixed to the housing by the fixing clip.

Fig. 13 is a perspective view of the fixing clip of embodiment 2.

Fig. 14 is a perspective view showing a state in which the 1 st pilot valve and the 2 nd pilot valve are fixed to the housing by the fixing clip of fig. 13.

Fig. 15 is an exploded perspective view of the pilot type electromagnetic valve according to embodiment 3.

Fig. 16 is a perspective view of the fixing clip of embodiment 4.

Fig. 17A is a cross-sectional view showing the distance between the bent portion and the connecting portion in the state before the fixing clip of fig. 16 is fixed to the case, that is, in the 1 st state.

Fig. 17B is a cross-sectional view showing the distance between the bent portion and the connecting portion in the state after the fixing clip of fig. 16 is fixed to the housing, that is, in the 2 nd state.

Detailed Description

< embodiment 1 >

An embodiment of a pilot-operated solenoid valve embodied in fig. 1 to 12B will be described below. The pilot-operated Solenoid valve of the present embodiment constitutes a Solenoid valve manifold (Solenoid valve) together with a manifold block.

As shown in fig. 1, the pilot type solenoid valve 10 is mounted on a mounting surface B1 of the manifold block MB. The pilot type electromagnetic valve 10 includes a main valve portion V1, a 1 st pilot valve 41, and a 2 nd pilot valve 42. The housing 11 of the main valve unit V1 is mounted on the mounting surface B1 of the manifold block MB, and has an elongated rectangular block shape.

The housing 11 includes a housing body 12 in the shape of an elongated rectangular block, a 1 st coupling block 13 coupled to a 1 st end of the housing body 12 in the longitudinal direction, and a 2 nd coupling block 14 coupled to a 2 nd end of the housing body 12 in the longitudinal direction. The housing body 12, the 1 st connecting block 13, and the 2 nd connecting block 14 are made of, for example, a synthetic resin material. The housing body 12 has a body facing surface 12a facing the placement surface B1 of the manifold block MB. The 1 st connecting block 13 has a 1 st facing surface 13a facing the mounting surface B1 of the manifold block MB. The 2 nd connecting block 14 has a 2 nd facing surface 14a facing the mounting surface B1 of the manifold block MB.

The 1 st connecting block 13 has a 1 st body 131 and a 1 st connector (adaptor) 132. The 1 st block body 131 is coupled to the 1 st end in the longitudinal direction of the case body 12. The 1 st joint 132 is coupled to a surface of the 1 st block body 131 on the side opposite to the case body 12. The 2 nd connecting block 14 has a 2 nd block body 141 and a 2 nd joint 142. The 2 nd block body 141 is coupled to the 2 nd end in the longitudinal direction of the case body 12. The 2 nd joint 142 is coupled to a surface of the 2 nd block body 141 on the opposite side to the case body 12.

As shown in fig. 2, the housing body 12 is formed with a circular hole-shaped valve hole 16 that accommodates the spool 15. The valve hole 16 extends in the longitudinal direction of the housing body 12. The 1 st end of the valve hole 16 opens toward the 1 st end surface in the longitudinal direction of the housing body 12, and the 2 nd end of the valve hole 16 opens toward the 2 nd end surface in the longitudinal direction of the housing body 12. Therefore, the valve hole 16 penetrates the case body 12 in the longitudinal direction of the case body 12. The spool 15 is housed in the valve hole 16 so as to be movable back and forth in the valve hole 16.

The housing body 12 is formed with a supply port 17, a 1 st output port 18, a 2 nd output port 19, a 1 st drain port 20, and a 2 nd drain port 21. Thus, the housing 11 has a plurality of ports. The pilot-operated solenoid valve 10 of the present embodiment is a five-port solenoid valve.

Five ports 17 to 21 are formed in the case body 12 in the order of a 1 st discharge port 20, a 1 st output port 18, a supply port 17, a 2 nd output port 19, and a 2 nd discharge port 21 from a 1 st end to a 2 nd end in the longitudinal direction of the case body 12. The 1 st end of each port 17-21 communicates with the valve hole 16. The 2 nd ends of the ports 17 to 21 are opened to the body-facing surface 12a of the housing body 12.

A 1 st seat portion 22 is provided on the inner peripheral surface of the valve hole 16 between the supply port 17 and the 1 st output port 18. A 2 nd valve seat portion 23 is provided on the inner peripheral surface of the valve hole 16 between the 1 st output port 18 and the 1 st discharge port 20. A 3 rd seat portion 24 is provided between the supply port 17 and the 2 nd output port 19 on the inner peripheral surface of the valve hole 16. Further, a 4 th seat portion 25 is provided on the inner peripheral surface of the valve hole 16 between the 2 nd output port 19 and the 2 nd discharge port 21. The 1 st seat portion 22, the 2 nd seat portion 23, the 3 rd seat portion 24, and the 4 th seat portion 25 are each formed in an annular shape, and form a part of the inner peripheral surface of the valve hole 16.

The valve hole 16 has a 1 st hole portion 16a forming a 1 st end portion of the valve hole 16. The 1 st hole portion 16a communicates with the 1 st discharge port 20 and is located on the opposite side of the 2 nd valve seat portion 23 with the 1 st discharge port 20 interposed therebetween. The valve hole 16 has a 2 nd hole portion 16b forming a 2 nd end portion of the valve hole 16. The 2 nd hole portion 16b communicates with the 2 nd discharge port 21 and is located on the opposite side of the 4 th valve seat portion 25 with the 2 nd discharge port 21 interposed therebetween. The 1 st seat portion 22, the 2 nd seat portion 23, the 3 rd seat portion 24, the 4 th seat portion 25, the 1 st hole portion 16a, and the 2 nd hole portion 16b have inner diameters that are equal to each other.

The spool 15 has a 1 st valve part 151, a 2 nd valve part 152, a 3 rd valve part 153, a 4 th valve part 154, a 5 th valve part 155, and a 6 th valve part 156 that are separated from each other in the axial direction of the spool 15. The 5 th, 2 nd, 1 st, 3 rd, 4 th, 154 th, and 6

th valve parts

155, 152, 151, 153, 156 are arranged in this order from the 1 st to the 2 nd ends in the axial direction of the spool 15, and the 1 st to 6 th valve parts 151 to 156 are arranged in this order. The 1 st to 6 th valve portions 151 to 156 have the same outer diameter.

The spool 15 has a 1 st shaft portion 15a, a 2 nd shaft portion 15b, and a 3 rd shaft portion 15 c. The 1 st shaft portion 15a connects the 1 st valve portion 151 and the 3 rd valve portion 153 to each other; the 2 nd shaft portion 15b connects the 1 st valve portion 151 and the 2 nd valve portion 152 to each other; the 3 rd shaft portion 15c connects the 3 rd valve portion 153 and the 4 th valve portion 154 to each other. The spool 15 has a 4 th shaft portion 15d and a 5 th shaft portion 15 e. The 4 th shaft portion 15d couples the 2 nd valve portion 152 and the 5 th valve portion 155 to each other; the 5 th shaft portion 15e connects the 4 th valve portion 154 and the 6 th valve portion 156 to each other.

The spool 15 has a columnar 1 st projection 15 f. The 1 st projecting portion 15f projects from an end surface of the 5 th valve portion 155 on the opposite side to the 4 th shaft portion 15 d. The 1 st projection 15f is the 1 st end in the axial direction of the spool 15. Further, the spool 15 has a columnar 2 nd projecting portion 15 g. The 2 nd projecting portion 15g projects from an end surface of the 6 th valve portion 156 on the opposite side to the 5 th shaft portion 15 e. The 2 nd projecting portion 15g is the 2 nd end portion in the axial direction of the spool 15.

The 1 st to 5 th shaft portions 15a to 15e, the 1 st projecting portion 15f, and the 2 nd projecting portion 15g have outer diameters that coincide with each other. The 1 st to 6 th valve portions 151 to 156 have outer diameters larger than the 1 st to 5 th shaft portions 15a to 15e, the 1 st projecting portion 15f, and the 2 nd projecting portion 15 g.

A 1 st spool packing 26 is attached to the outer peripheral surface of the 1 st valve portion 151. When the 1 st valve portion 151 seats in the 1 st valve seat portion 22, the 1 st spool seal 26 seals between the supply port 17 and the 1 st output port 18. The 2 nd valve portion 152 has a 2 nd spool seal 27 attached to an outer peripheral surface thereof. When the 2 nd valve portion 152 seats in the 2 nd valve seat portion 23, the 2 nd spool seal 27 seals between the 1 st output port 18 and the 1 st discharge port 20. The 3 rd valve portion 153 has a 3 rd spool packing 28 attached to an outer peripheral surface thereof. When the 3 rd valve portion 153 seats in the 3 rd valve seat portion 24, the 3 rd spool seal 28 seals between the supply port 17 and the 2 nd output port 19. The 4 th valve portion 154 has a 4 th spool seal 29 attached to its outer peripheral surface. When the 4 th valve portion 154 seats in the 4 th valve seat portion 25, the 4 th spool seal 29 seals between the 2 nd output port 19 and the 2 nd discharge port 21. The 1 st to 4 th spool seals 26 to 29 are made of rubber and are annular.

The 1 st block main body 131 of the 1 st connecting block 13 is formed with a 1 st piston accommodating recess 31 in a circular hole shape communicating with the 1 st hole portion 16 a. The 1 st protruding portion 15f of the spool 15 can move so as to enter the 1 st piston receiving recess portion 31 from the 1 st hole portion 16a and to enter the 1 st hole portion 16a from the 1 st piston receiving recess portion 31. The 1 st piston accommodating recess 31 accommodates a 1 st piston 32 in the form of a circular plate that can move back and forth. The 1 st piston 32 is attached to the 1 st projection 15f at the 1 st end of the spool 15. A 1 st lip seal 33 is attached to the outer peripheral surface of the 1 st piston 32. The 1 st lip seal 33 seals between the 1 st piston 32 and the inner peripheral surface of the 1 st piston accommodating recess 31. The 1 st piston 32 defines a 1 st pilot pressure acting chamber 34 in the 1 st piston accommodating recess 31. The 1 st pilot pressure acting chamber 34 is supplied with and discharged with pilot fluid.

The 2 nd block main body 141 of the 2 nd connecting block 14 is formed with a 2 nd piston accommodating recess 35 in a circular hole shape communicating with the 2 nd hole portion 16 b. The inner diameter of the 2 nd piston accommodating recess 35 is the same as that of the 1 st piston accommodating recess 31. The 2 nd projecting portion 15g of the spool 15 can move so as to enter the 2 nd piston accommodating recess portion 35 from the 2 nd hole portion 16b and so as to enter the 2 nd hole portion 16b from the 2 nd piston accommodating recess portion 35. The 2 nd piston accommodating recess 35 accommodates a disc-shaped 2 nd piston 36 which can move back and forth. The 2 nd piston 36 is attached to the 2 nd projecting portion 15g of the 2 nd end portion of the spool 15. The outer diameter of the 2 nd piston 36 is the same as the outer diameter of the 1 st piston 32. A 2 nd lip seal 37 is attached to the outer peripheral surface of the 2 nd piston 36. The 2 nd lip seal 37 seals between the 2 nd piston 36 and the inner peripheral surface of the 2 nd piston accommodating recess 35. The 2 nd piston 36 defines a 2 nd pilot pressure acting chamber 38 in the 2 nd piston accommodating recess 35. Therefore, the 1 st pilot pressure acting chamber 34 and the 2 nd pilot pressure acting chamber 38 are provided on both end portions of the spool 15 in the housing 11, respectively. The 2 nd pilot pressure acting chamber 38 is supplied with and discharged with pilot fluid.

Since the outer diameter of the 1 st piston 32 is the same as the outer diameter of the 2 nd piston 36, the pressure receiving area of the 1 st piston 32 is the same as the pressure receiving area of the 2 nd piston 36, the pressure receiving area of the 1 st piston 32 is the area of the 1 st piston 32 portion that receives the pressure of the pilot fluid in the 1 st pilot pressure apply chamber 34, and the pressure receiving area of the 2 nd piston 36 is the area of the 2 nd piston 36 portion that receives the pressure of the pilot fluid in the 2 nd pilot pressure apply chamber 38.

The 1 st sealing member 39a is attached to the outer peripheral surface of the 5 th valve part 155, and the 1 st sealing member 39a seals between the 5 th valve part 155 and the 1 st hole part 16 a. The 1 st seal member 39a is annular and made of rubber. The 1 st seal member 39a suppresses leakage of the fluid from the 1 st discharge port 20 to the 1 st piston accommodating recess 31 through the 1 st hole portion 16 a.

The 2 nd sealing member 39b is attached to the outer peripheral surface of the 6 th valve portion 156, and the 2 nd sealing member 39b seals between the 6 th valve portion 156 and the 2 nd hole portion 16 b. The 2 nd seal member 39b is annular and made of rubber. The 2 nd seal member 39b can suppress leakage of the fluid from the 2 nd discharge port 21 to the 2 nd piston accommodating recess 35 through the 2 nd hole portion 16 b.

As shown in fig. 3, the 1 st pilot valve 41 and the 2 nd pilot valve 42 have the same configuration. The 1 st pilot valve 41 and the 2 nd pilot valve 42 each have a rectangular block-shaped valve body 60. Each valve element 60 has a rectangular tubular solenoid case 43 having an opening at one end and a rectangular block-shaped flow path forming block 44 connected to the solenoid case 43. The solenoid case 43 and the flow path forming block 44 are made of, for example, a synthetic resin material. Therefore, the solenoid case 43 and the flow passage forming block 44 are made of a nonmagnetic material.

The solenoid case 43 has a rectangular plate-shaped end wall 43a and a peripheral wall 43b extending from the outer periphery of the end wall 43a in a rectangular tube shape. The flow path forming block 44 is coupled to an end portion of the peripheral wall 43b on the opposite side of the end wall 43a, that is, an open end portion. The flow path forming block 44 closes the opening of the peripheral wall 43 b. A magnetic frame 45 made of a magnetic material is fixed to the solenoid case 43. The magnetic frame 45 has a plate-like end wall 45a, a cylindrical extension 45b, and an opening end. The end wall 45a extends along the inner surface of the end wall 43a of the solenoid housing 43. The extension 45b extends from the peripheral edge of the end wall 45a along the inner peripheral surface of the peripheral wall 43b of the solenoid case 43. The open end is an end of the extension 45b on the opposite side of the end wall 45 a.

The 1 st pilot valve 41 and the 2 nd pilot valve 42 are respectively provided with a Solenoid (Solenoid) 46. Each solenoid 46 has a coil 47, a fixed core 48, a Plunger (Plunger)49, and a Plunger spring 50. The fixed core 48 and the plunger 49 are made of a magnetic material. A cylindrical Bobbin (Bobbin)51 around which the coil 47 is wound is accommodated in the solenoid case 43. The axis of the bobbin 51 coincides with the axis of the extension 45b of the magnetic frame 45.

The fixed core 48 is accommodated in the solenoid case 43. The fixed core 48 has a columnar shape. The fixed core 48 is fixed to the bobbin 51 in a state of being inserted into the bobbin 51. The axis of the fixed core 48 coincides with the axis of the bobbin 51. The length of the fixed core 48 in the axial direction is shorter than the length of the bobbin 51 in the axial direction. An end surface 48e of the fixed core 48 on the side opposite to the end wall 45a of the magnetic frame 45 is flat. The end surface 48e of the fixed core 48 is located inside the bobbin 51.

The plunger 49 is columnar and inserted into the bobbin 51. The plunger 49 is located between the fixed core 48 and the flow path forming block 44. The axis of the plunger 49 coincides with the axis of the fixed core 48. An end face 49e of the plunger 49 facing the fixed core 48 is flat. The end face 49e of the plunger 49 can be in surface contact with the end face 48e of the fixed core 48. An end portion of the plunger 49 opposite to the fixed core 48 protrudes from the bobbin 51. An annular flange portion 49f extends radially outward from an end portion of the outer peripheral surface of the plunger 49 opposite to the fixed core 48.

A cylindrical magnetic core 52 is disposed on the inner peripheral side of the opening end of the magnetic frame 45. The magnetic core 52 is located between the bobbin 51 and the flow path forming block 44. The outer peripheral surface of the magnetic core 52 is in contact with the inner peripheral surface of the extension portion 45b of the magnetic frame 45. The plunger 49 passes inside the magnetic core 52.

The plunger spring 50 is interposed between the magnetic core 52 and the flange portion 49f of the plunger 49. The 1 st end of the plunger spring 50 is supported by the end surface of the magnetic core 52, and the 2 nd end of the plunger spring 50 is supported by the flange portion 49f of the plunger 49. The plunger spring 50 urges the plunger 49 in a direction in which the end face 49e of the plunger 49 is away from the end face 48e of the fixed core 48.

The end surface of the flow path forming block 44 on the side opposite to the solenoid case 43 is formed with 2 circular hole-shaped housing holes 44h having an opening at one end. The axis of each receiving hole 44h coincides with the axis of the corresponding plunger 49. Each valve element 60 has a cylindrical plug 54 that can be attached to the housing hole 44 h. The plugs 54 are attached to the housing holes 44h via the sealing members 53. The plug 54 closes the opening of the housing hole 44 h. The plug 54 partitions the valve chamber 55 in cooperation with the housing hole 44 h.

The valve chamber 55 accommodates a pilot valve body 56. A 1 st valve seat 57 is formed on an end surface of the plug 54 facing the inside of the valve chamber 55, and the pilot spool 56 is seated on the 1 st valve seat 57. Further, a 2 nd valve seat 58 is formed on an inner end surface of the housing hole 44h, and the pilot valve spool 56 is seated on the 2 nd valve seat 58. The pilot spool 56 can contact and separate from the 1 st valve seat 57 and the 2 nd valve seat 58. Therefore, the pilot spool 56 is accommodated in the valve chamber 55 so as to be movable between the 1 st valve seat 57 and the 2 nd valve seat 58. The 1 st valve seat 57 and the 2 nd valve seat 58 are disposed to face each other in the movement direction of the pilot spool 56 in the valve chamber 55.

In the valve chamber 55, a spool spring 59 is interposed between the pilot spool 56 and the plug 54. The spool spring 59 biases the pilot spool 56 in a direction to separate the pilot spool 56 from the 1 st valve seat 57. The biasing force of the spool spring 59 is smaller than the biasing force of the plunger spring 50.

The plunger 49 has a pair of valve pressing portions 49a in the form of a long plate. The pair of valve pressing portions 49a protrude from an end surface of the plunger 49 on the opposite side to the fixed core 48. The pair of valve pressing portions 49a penetrate the flow passage forming block 44 and protrude into the valve chamber 55. Further, the leading ends of the pair of valve pressing portions 49a abut on the pilot valve spool 56.

As shown in fig. 3 and 4, each flow path formation block 44 has a supply flow path 61, a 1 st output flow path 62, a 2 nd output flow path 63, a 1 st discharge flow path 64, and a 2 nd discharge flow path 65. The supply channel 61 is formed by the 1 st well 611, the 2 nd well 612, the 3 rd well 613, the groove 614, and the through hole 615. The 1 st hole 611 has a 1 st end opening to the 1 st surface 441 of the flow path formation block 44 and a 2 nd end opening to the housing hole 44 h. The 1 st hole 611 extends straight from the 1 st surface 441 of the flow path formation block 44 to the housing hole 44h and penetrates the flow path formation block 44. The 2 nd hole 612 has a 1 st end opening to the 2 nd surface 442 on the opposite side of the 1 st surface 441 in the flow path formation block 44 and a 2 nd end opening to the housing hole 44 h. The 1 st surface 441 and the 2 nd surface 442 are parallel to each other. The 2 nd hole 612 extends straight from the 2 nd surface 442 of the flow path forming block 44 toward the housing hole 44h and penetrates the flow path forming block 44.

The groove 614 is formed in the entire circumferential direction of the outer circumferential surface of the plug 54. The 1 st hole 611 and the 2 nd hole 612 communicate with the inside of the groove 614. The through hole 615 communicates with the groove 614, and extends in the radial direction of the plug 54 to penetrate the plug 54. The 3 rd hole 613 has a 1 st end opening to the through hole 615 and a 2 nd end opening to the front end of the 1 st valve seat 57. The 3 rd hole 613 extends straight from the through hole 615 toward the tip of the 1 st valve seat 57 and penetrates the plug 54. The 3 rd hole 613 communicates with the valve chamber 55. Therefore, the supply passage 61 opens to the 1 st surface 441 and the 2 nd surface 442 of the passage forming block 44, and communicates with the valve chamber 55.

The 1 st discharge channel 64 is formed by the 1 st hole 641 and the 2 nd hole 642. The 1 st hole 641 has a 1 st end opening to the 1 st surface 441 of the flow passage forming block 44 and a 2 nd end extending to the inside of the flow passage forming block 44. The 2 nd hole 642 has a 1 st end communicating with the 2 nd end of the 1 st hole 641 and a 2 nd end opening to the front end of the 2 nd valve seat 58. The 2 nd hole 642 communicates with the valve chamber 55. Therefore, the 1 st discharge flow path 64 opens to the 1 st surface 441 of the flow path formation block 44, and communicates with the valve chamber 55.

As shown in fig. 5, the supply flow path 61, the 1 st output flow path 62, and the 1 st discharge flow path 64 are arranged in this order in the moving direction of the pilot valve body 56 from the opening side near the housing hole 44 h. The opening of the supply channel 61 facing the 1 st surface 441 and the opening of the 1 st discharge channel 64 facing the 1 st surface 441 are located on both sides of the 1 st output channel 62 facing the 1 st surface 441 in the moving direction of the pilot spool 56.

As shown in fig. 4 and 5, the 2 nd output channel 63 has a 1 st end opening to the 1 st surface 441 of the channel forming block 44 and a 2 nd end extending to the 2 nd surface 442 of the channel forming block 44. The 2 nd output channel 63 extends straight from the 1 st surface 441 to the 2 nd surface 442. The extending direction of the 2 nd output channel 63 is a direction perpendicular to the 1 st surface 441 and the 2 nd surface 442. The pair of side surfaces 443 of the flow passage forming block 44 connect the 1 st surface 441 and the 2 nd surface 442 of the flow passage forming block 44 to each other in a direction perpendicular to the moving direction of the pilot spool 56. As shown in fig. 5, the 2 nd output channel 63 is located closer to the 1 st side surface of the pair of side surfaces 443 than to the 1 st discharge channel 64.

As shown in fig. 4 and 5, the 2 nd discharge channel 65 has a 1 st end opening to the 1 st surface 441 of the channel forming block 44 and a 2 nd end extending to the 2 nd surface 442 of the channel forming block 44. The 2 nd discharge channel 65 extends straight from the 1 st surface 441 to the 2 nd surface 442. The 2 nd discharge channel 65 extends in a direction perpendicular to the 1 st surface 441 and the 2 nd surface 442. The 2 nd discharge flow path 65 extends in parallel with the 2 nd output flow path 63. As shown in fig. 5, the 2 nd discharge flow path 65 is located closer to the 2 nd side surface 443 of the pair of side surfaces with respect to the 1 st discharge flow path 64.

As shown in fig. 4, 6, and 7, each flow passage forming block 44 has an output flow passage communicating recess 66. The output flow path communication concave portion 66 is formed in a portion of the 2 nd surface 442 of the flow path formation block 44, the portion including a portion overlapping with the opening region Z1 of the 1 st output flow path 62 that opens to the 1 st surface 441 and a portion overlapping with the 2 nd output flow path 63. The output flow path communication concave portion 66 communicates with the 2 nd end of the 2 nd output flow path 63.

Further, the flow passage forming block 44 has a discharge flow passage communication concave portion 67. The discharge flow path communication concave portion 67 is formed in a portion of the 2 nd surface 442 of the flow path formation block 44, the portion including a portion overlapping with the opening region Z2 of the 1 st discharge flow path 64 that opens to the 1 st surface 441 and a portion overlapping with the 2 nd discharge flow path 65. The discharge flow path communication concave portion 67 communicates with the 2 nd end of the 2 nd discharge flow path 65.

As shown in fig. 3, the 1 st pilot valve 41 and the 2 nd pilot valve 42 are disposed adjacent to each other in the housing 11. The 2 nd pilot valve 42 is disposed closer to the 1 st coupling block 13 of the housing 11 than the 1 st pilot valve 41. The 1 st pilot valve 41 and the 2 nd pilot valve 42 are collectively arranged on the opposite side of the 1 st coupling block 13 from the case main body 12. Therefore, the pilot-operated solenoid valve 10 according to the present embodiment is a single-side solenoid-type solenoid valve, that is, the 1 st pilot valve 41 and the 2 nd pilot valve 42 are disposed in a single side of the housing 11.

The 2 nd pilot valve 42 is disposed in a state where the 1 st surface 441 of the flow passage forming block 44 of the 2 nd pilot valve 42 is in contact with the surface of the 1 st joint 132 of the 1 st connecting block 13 on the side opposite to the case body 12. The 1 st pilot valve 41 and the 2 nd pilot valve 42 are disposed in a state where the 1 st surface 441 of the flow path forming block 44 of the 1 st pilot valve 41 and the 2 nd surface 442 of the flow path forming block 44 of the 2 nd pilot valve 42 are in contact with each other. Therefore, the valve body 60 of the 1 st pilot valve 41 and the valve body 60 of the 2 nd pilot valve 42 are arranged as follows: the 1 st surface 441 of the valve body 60 of the 1 st pilot valve 41 and the 2 nd surface 442 of the valve body 60 of the 2 nd pilot valve 42 abut against each other, and the 1 st surface 441 of the valve body 60 of the 2 nd pilot valve 42 abuts against the housing 11.

Next, as shown in fig. 4, the supply flow path 61 of the 1 st pilot valve 41 and the supply flow path 61 of the 2 nd pilot valve 42 communicate with each other. Further, the output flow path communication concave portion 66 of the flow path forming block 44 of the 2 nd pilot valve 42 communicates with the 1 st output flow path 62 of the 1 st pilot valve 41. Therefore, the 1 st output flow path 62 of the 1 st pilot valve 41 communicates with the 2 nd output flow path 63 of the 2 nd pilot valve 42 through the output flow path communication recess 66 of the 2 nd pilot valve 42. Further, the discharge flow path communication concave portion 67 of the flow path forming block 44 of the 2 nd pilot valve 42 communicates with the 1 st discharge flow path 64 of the 1 st pilot valve 41. Therefore, the 1 st discharge flow path 64 of the 1 st pilot valve 41 communicates with the 2 nd discharge flow path 65 of the 2 nd pilot valve 42 through the discharge flow path communication recess 67 of the 2 nd pilot valve 42. Therefore, the valve body 60 of the 1 st pilot valve 41 and the valve body 60 of the 2 nd pilot valve 42 form a plurality of flow paths through which the pilot fluid flows. The plurality of flow paths include an open flow path that opens to the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41 and the valve body 60 of the 2 nd pilot valve 42.

As shown in fig. 3, a portion of the supply flow path 61 of the 1 st pilot valve 41 that opens to the 2 nd surface 442, the output flow path communication concave portion 66, and the discharge flow path communication concave portion 67 of the 1 st pilot valve 41 are closed by the fixing clip 70. Among these, the portion of the supply flow path 61 of the 1 st pilot valve 41 that opens to the 2 nd surface 442, the output flow path communication concave portion 66 of the 1 st pilot valve 41, and the discharge flow path communication concave portion 67 are flow paths of the pilot fluid that opens to the outside of the pilot-operated solenoid valve 10.

As shown in fig. 8, the fixing clip 70 is made of metal. The fixing clip 70 has a pair of extending portions 70a, a closing portion 70b, a connecting portion 70c, and a bent portion 70 d. The connecting portion 70c is in the form of a long quadrangular plate. The pair of extending portions 70a are thin, long, flat plates and extend parallel to each other. The connecting portion 70c is a thin flat plate, and connects the 1 st ends in the longitudinal direction of the pair of extending portions 70a to each other. The 1 st ends of the pair of extending portions 70a are connected to both ends of the connecting portion 70c in the longitudinal direction. The connecting portion 70c connects the pair of extending portions 70a so as to be perpendicular to the pair of extending portions 70 a. The extending direction from the connecting portion 70C to the pair of extending portions 70a is referred to as a 1 st direction a, the extending direction of the connecting portion 70C between the pair of extending portions 70a is referred to as a 2 nd direction B, and the direction perpendicular to the 1 st direction a and the 2 nd direction B is referred to as a 3 rd direction C. The 2 nd end opposite to the 1 st end of each extension portion 70a is provided with a locking hole 70h as a locked portion. The locking hole 70h is a circular through hole that penetrates the extended portion 70a in the plate thickness direction of the extended portion 70 a.

The longitudinal direction of the joint 70C is the 2 nd direction B, and the lateral direction of the joint 70C is the 3 rd direction C. The connecting portion 70c has a plate surface 70 facing the opposite side of the pair of extending portions 70 a. The bent portion 70d has a bent plate shape. The bent portion 70d extends from the 1 st end of the connecting portion 70C in the 3 rd direction C. The bent portion 70d has a portion protruding to the opposite side of the pair of extended portions 70a beyond the virtual plane Vp extending along the plate surface 70i of the connecting portion 70 c. The bent portion 70d is bent between the pair of extending portions 70 a. The bent portion 70d is bent into an arc shape. The bent portion 70d has a 1 st end connected to the connecting portion 70c and a 2 nd end opposite to the 1 st end. The closing portion 70b has a plate shape. The closing portion 70b extends from the 2 nd end of the bent portion 70d toward between the pair of extending portions 70 a. The closing portion 70b is disposed between the pair of extending portions 70 a. The distal end of the closing portion 70b extends outward from between the pair of extending portions 70a beyond the 2 nd end of the connecting portion 70C in the 3 rd direction C. Fig. 8 shows a state before the fixing clip 70 is fixed to the housing 11, i.e., a 1 st state.

As shown in fig. 9, the 1 st guide groove 71a is formed in a pair of side surfaces 443 of each flow passage forming block 44. The pair of 1 st guide grooves 71a are parallel to each other. The pair of 1 st guide grooves 71a extend from the 1 st surface 441 to the 2 nd surface 442. The 1 st joint 132 has a pair of side surfaces to which the pair of side surfaces 443 of the flow passage forming block 44 of the 2 nd pilot valve 42 are coupled, and the 2 nd guide groove 71b coupled to the 1 st guide groove 71a is formed on the pair of side surfaces of the 1 st joint 132. Each 1 st guide groove 71a and the 2 nd guide groove 71b connected thereto are located on the same plane as each other.

As shown in fig. 5, the pair of 1 st guide grooves 71a are disposed at positions that sandwich the opening of the supply channel 61 facing the 1 st surface 441 and the opening of the 1 st output channel 62 facing the 1 st surface 441, when viewed from the 1 st surface 441.

As shown in fig. 9, a columnar locking protrusion 71f serving as a locking portion is provided in each of the 2 nd guide grooves 71b, and the locking protrusion 71f locks the locking hole 70 h. The portion of the outer peripheral surface of the locking projection 71f on the opposite side of the valve body 60 of the 2 nd pilot valve 42 is formed in an arc shape that follows the inner peripheral surface of the locking hole 70 h.

As shown in fig. 10, a portion of the outer peripheral surface of the locking projection 71f that faces the valve body 60 of the 2 nd pilot valve 42 is formed as a tapered surface 71 g. The tapered surface 71g is inclined in the following manner: the valve body 60 of the 2 nd pilot valve 42 is further apart from the base end of the locking projection 71f toward the tip.

As shown in fig. 11, in a state where the 1 st pilot valve 41 and the 2 nd pilot valve 42 are adjacent to each other, the pair of extending portions 70a are guided to the pair of 2 nd guide grooves 71b via the pair of 1 st guide grooves 71 a. Then, the locking holes 70h are locked to the locking projections 71 f. That is, the 1 st guide groove 71a and the 2 nd guide groove 71b constitute a guide groove for guiding the pair of extending portions 70 a. In this way, the locking holes 70h are engaged with the locking projections 71f, and the pair of extending portions 70a are fixed to the 1 st joint 132, whereby the fixing clip 70 is fixed to the housing 11.

As shown in fig. 5, the pair of extending portions 70a are disposed at positions that are separated by the opening of the supply channel 61 facing the 1 st surface 441 and the opening of the 1 st output channel 62 facing the 1 st surface 441, when viewed from the 1 st surface 441.

As shown in fig. 3, the closing portion 70b of the fixing clip 70 abuts on the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41. The closing portion 70b closes the opening flow path of the 1 st pilot valve 41 that opens to the 2 nd surface 442 of the flow path formation block 44, that is, closes the supply flow path 61, the output flow path communication concave portion 66, and the discharge flow path communication concave portion 67. Then, the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the 1 st joint 132 by the fixing clip 70 in a state of being sandwiched by the closing portion 70b of the fixing clip 70 and the 1 st joint 132 by the pair of extension portions 70a being fixed to the 1 st joint 132. Therefore, the fixing clip 70 fixes the 1 st pilot valve 41 and the 2 nd pilot valve 42 to the housing 11. The pair of extension portions 70a is fixed to the housing 11, and the closing portion 70b closes the flow path that is open to the 2 nd surface 442 in the valve body 60 of the 1 st pilot valve 41 in a state where the 1 st pilot valve 41 and the 2 nd pilot valve 42 are sandwiched in cooperation with the housing 11. Fig. 3 shows a state in which the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, that is, a 2 nd state.

Next, the 1 st state and the 2 nd state of the fixing clip 70 will be described.

As shown in fig. 12A, in the 1 st state, the closing portion 70b and the connecting portion 70c of the fixing clip 70 are separated. In the 1 st state, the distance D1 between the closing portion 70b and the connecting portion 70C gradually increases as it goes away from the bent portion 70D in the 3 rd direction C. That is, the 1 st state is a state in which the closing portion 70b is inclined with respect to the connecting portion 70 c.

As shown in fig. 12B, the closing portion 70B of the fixing clip 70 is closer to the connecting portion 70c in the 2 nd state than in the 1 st state. Further, the closing portion 70b and the connecting portion 70c are also separated in the 2 nd state. That is, in the 2 nd state, the interval D2 between the closing portion 70b and the connecting portion 70c is smaller than the interval D1 between the closing portion 70b and the connecting portion 70c in the 1 st state. In the 2 nd state, the closing portion 70b and the connecting portion 70c are parallel. That is, the interval between the closing portion 70b and the connecting portion 70c is fixed over the entire area of the space between the closing portion 70b and the connecting portion 70 c.

As shown in fig. 12A and 12B, when the state 1 is shifted to the state 2, the closing portion 70B of the fixing clip 70 is deformed with the 2 nd end of the bent portion 70d as a starting point. Therefore, a restoring force to restore to the 1 st state is generated in the closing portion 70 b. Therefore, since the bent portion 70d has a spring structure, the closing portion 70b is pressed against the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41 in the 2 nd state. Therefore, the bent portion 70d functions as a biasing portion that biases the closing portion 70b toward the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41. The bent portion 70d generates a biasing force to bias the closing portion 70b toward the 2 nd surface 442.

As shown in fig. 3, the spacer 72 is disposed on the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41. Further, the packing 72 is also arranged between the 1 st surface 441 of the flow passage forming block 44 of the 1 st pilot valve 41 and the 2 nd surface 442 of the flow passage forming block 44 of the 2 nd pilot valve 42, and between the 1 st surface 441 of the flow passage forming block 44 of the 2 nd pilot valve 42 and the housing 11, respectively.

The packing 72 disposed on the 2 nd surface 442 of the flow path formation block 44 of the 1 st pilot valve 41 is pressed against the flow path formation block 44 of the 1 st pilot valve 41 by the closing portion 70b of the fixing clip 70. Therefore, the surface of the closing portion 70b of the fixing clip 70 opposite to the connecting portion 70c serves as a pressing surface for pressing the packing 72 against the flow passage forming block 44 of the 1 st pilot valve 41. Here, the packing 72 provided between the closing portion 70b and the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41 serves as a sealing member for sealing between the closing portion 70b and the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41.

As shown in fig. 5 and 6, the spacer 72 includes a 1 st spacer hole 72a, a 2 nd spacer hole 72b, a 3 rd spacer hole 72c, a 4 th spacer hole 72d, and a 5 th spacer hole 72 e. The 1 st pad hole 72a surrounds the opening of the supply channel 61 when the 1 st surface 441 is viewed in plan. The 2 nd gasket hole 72b surrounds the opening of the 1 st output channel 62 in a plan view of the 1 st surface 441. The 3 rd gasket hole 72c surrounds the opening of the 1 st discharge flow path 64 in a plan view of the 1 st surface 441. The 4 th gasket hole 72d surrounds the opening of the 2 nd output channel 63 when the 1 st surface 441 is viewed in plan. The 5 th gasket hole 72e surrounds the opening of the 2 nd discharge flow path 65 in a plan view of the 1 st surface 441.

The gasket 72 disposed between the 1 st surface 441 of the flow passage forming block 44 of the 2 nd guide valve 42 and the housing 11 seals the supply flow passage 61, the 1 st output flow passage 62, the 2 nd output flow passage 63, the 1 st discharge flow passage 64, and the 2 nd discharge flow passage 65 of the 2 nd guide valve 42 on the 1 st surface 441 side, respectively. The packing 72 disposed between the 1 st surface 441 of the flow path forming block 44 of the 1 st pilot valve 41 and the 2 nd surface 442 of the flow path forming block 44 of the 2 nd pilot valve 42 seals the supply flow path 61, the 1 st output flow path 62, the 2 nd output flow path 63, the 1 st discharge flow path 64, and the 2 nd discharge flow path 65 of the 1 st pilot valve 41 on the 1 st surface 441 side. The packing 72 seals the supply flow path 61, the output flow path communication recess 66, and the discharge flow path communication recess 67 of the 2 nd pilot valve 42 on the 2 nd surface 442 side. The packing 72 disposed between the 2 nd surface 442 of the flow path formation block 44 of the 1 st pilot valve 41 and the closing portion 70b of the fixing clip 70 seals the supply flow path 61, the output flow path communication recess 66, and the discharge flow path communication recess 67 of the 1 st pilot valve 41 on the 2 nd surface 442 side.

As shown in fig. 1, the housing 11 is formed with a pilot fluid supply passage 73, and the pilot fluid supply passage 73 communicates with the supply port 17 through the valve hole 16. The pilot fluid supply passage 73 is always open to a position of the communication supply port 17 in the valve hole 16 so as not to be related to the position of the spool 15. The pilot fluid supply passage 73 is connected to the supply passage 61 of the 2 nd pilot valve 42.

Further, the housing 11 is formed with a pilot fluid output flow path 74, and the pilot fluid output flow path 74 connects the 1 st output flow path 62 of the 2 nd pilot valve 42 and the 2 nd pilot pressure acting chamber 38. For convenience of illustration, specific paths of the pilot fluid output flow path 74 are not shown. Further, the housing 11 is formed with a pilot fluid discharge flow path 75, and the pilot fluid discharge flow path 75 communicates with the 1 st discharge flow path 64 of the 2 nd pilot valve 42. The pilot fluid discharge flow path 75 branches on the side opposite to the 2 nd pilot valve 42 into: a flow path of the 1 st connecting block 13 that opens to the end surface facing the housing body 12, and a flow path of the 1 st connecting block 13 that opens to the 1 st facing surface 13 a.

As shown in fig. 1 and 7, the housing 11 is formed with a pilot fluid output flow path 76, and the pilot fluid output flow path 76 connects the 2 nd output flow path 63 of the 2 nd pilot valve 42 and the 1 st pilot pressure acting chamber 34. Further, the housing 11 is formed with a pilot fluid discharge flow path 77, and the pilot fluid discharge flow path 77 communicates with the 2 nd discharge flow path 65 of the 2 nd pilot valve 42. An end of the pilot fluid discharge flow path 77 on the opposite side of the 2 nd discharge flow path 65 of the 2 nd pilot valve 42 communicates with the pilot fluid discharge flow path 75. For convenience of illustration, specific paths of the pilot fluid output flow path 76 and the pilot fluid discharge flow path 77 are not shown.

As shown in fig. 1, the 2 nd connecting block 14 of the housing 11 is formed with a pilot fluid discharge flow path 78. The pilot fluid discharge flow path 78 branches into: a flow path that opens to an end surface of the 2 nd connecting block 14 that faces the housing main body 12, and a flow path that opens to the 2 nd facing surface 14a of the 2 nd connecting block 14. For example, when the 1 st pilot valve 41 and the 2 nd pilot valve 42 are disposed in the 2 nd coupling block 14 on the opposite side of the housing main body 12 and the 2 nd pilot valve 42 is disposed closer to the 2 nd coupling block 14 than the 1 st pilot valve 41, the pilot fluid discharge flow path 78 communicates with the 1 st discharge flow path 64 of the 2 nd pilot valve 42.

As shown in fig. 1 and 2, the manifold block MB is provided with a block supply passage 81, a 1 st block output passage 82, a 2 nd block output passage 83, a 1 st block discharge passage 84, and a 2 nd block discharge passage 85. The flow paths 81-85 are open to the mounting surface B1. The end of the block supply passage 81 that opens toward the mounting surface B1 communicates with the supply port 17. The 1 st block output flow path 82 has an end opening toward the mounting surface B1 and communicates with the 1 st output port 18. The 2 nd block output flow path 83 has an end opening to the mounting surface B1 and communicates with the 2 nd output port 19. The end of the 1 st block discharge flow path 84 that opens to the mounting surface B1 communicates with the 1 st discharge port 20. The end of the block 2 discharge flow path 85 that opens to the mounting surface B1 communicates with the 2 nd discharge port 21.

The end of the block supply passage 81 opposite to the mounting surface B1 is connected to a fluid supply source, not shown, by a pipe or the like, for example. An end portion of the 1 st block output flow path 82 opposite to the mounting surface B1 and an end portion of the 2 nd block output flow path 83 opposite to the mounting surface B1 are connected to a fluid pressure device, not shown, by pipes or the like, for example. The end of the 1 st block discharge passage 84 opposite to the mounting surface B1 and the end of the 2 nd block discharge passage 85 opposite to the mounting surface B1 are connected to the atmosphere by pipes, for example.

The manifold block MB is formed with a 1 st block side pilot fluid discharge flow path 86 and a 2 nd block side pilot fluid discharge flow path 87. The 1 st end of the 1 st block side pilot fluid discharge flow path 86 opens to a portion facing the 1 st facing surface 13a of the 1 st coupling block 13 on the mounting surface B1, and communicates with the pilot fluid discharge flow path 75. The 2 nd end of the 1 st block side pilot fluid discharge flow path 86 communicates with the 1 st block discharge flow path 84. The 1 st end of the 2 nd block side pilot fluid discharge flow passage 87 opens to a portion facing the 2 nd facing surface 14a of the 2 nd coupling block 14 on the mounting surface B1, and communicates with the pilot fluid discharge flow passage 78. The 2 nd end of the 2 nd block side pilot fluid discharge flow path 87 communicates with the 2 nd block discharge flow path 85.

A block-side packing 88 is provided between the mounting surface B1 of the manifold block MB and the case body 12. The block-side gasket 88 seals the mounting surface B1 of the manifold block MB and the case body 12.

A 1 st check valve 89a is attached to a 1 st end of the 1 st block side pilot fluid discharge flow path 86. When the pressure in the 1 st check valve 89a reaches the predetermined pressure, the 1 st check valve 89a opens to allow the fluid to flow from the pilot fluid discharge passage 75 to the 1 st block side pilot fluid discharge passage 86. When the pressure in the 1 st check valve 89a is lower than the predetermined pressure, the 1 st check valve 89a closes to stop the flow of the fluid from the 1 st block side pilot fluid discharge flow path 86 to the pilot fluid discharge flow path 75.

A 2 nd check valve 89b is attached to a 1 st end of the 2 nd block side pilot fluid discharge flow path 87. When the pressure in the 2 nd check valve 89b reaches the predetermined pressure, the 2 nd check valve 89b opens to allow the fluid to flow from the pilot fluid discharge passage 78 to the 2 nd block side pilot fluid discharge passage 87. When the pressure in the 2 nd check valve 89b reaches a predetermined pressure, the 2 nd check valve 89b closes to stop the flow of the fluid from the 2 nd block side pilot fluid discharge flow path 87 to the pilot fluid discharge flow path 78.

As shown in fig. 1, the 1 st pilot valve 41 has a 1 st connection terminal 91. The 1 st connection terminal 91 is electrically connected to the coil 47 of the solenoid 46 of the 1 st pilot valve 41. The 1 st connection terminal 91 protrudes from an end surface of the solenoid case 43 of the 1 st pilot valve 41 on the side opposite to the flow path forming block 44. Further, the 2 nd pilot valve 42 has a 2 nd connection terminal 92. The 2 nd connection terminal 92 is electrically connected to the coil 47 of the solenoid 46 of the 2 nd pilot valve 42. The 2 nd connection terminal 92 protrudes from an end surface of the solenoid case 43 of the 2 nd pilot valve 42 on the side opposite to the flow passage forming block 44.

The manifold block MB has a circuit board 93, a 1 st terminal 94, and a 2 nd terminal 95. The electric power of the circuit board 93 is supplied from an external control device such as a Programmable Logic Controller (PLC), for example. The 1 st terminal 94 and the 2 nd terminal 95 are electrically connected to the circuit board 93. The pilot type solenoid valve 10 is mounted on the mounting surface B1 of the manifold block MB, and the 1 st connection terminal 91 is connected to the 1 st terminal 94. The pilot type solenoid valve 10 is mounted on the mounting surface B1 of the manifold block MB, and the 2 nd connection terminal 92 is connected to the 2 nd terminal 95. The solenoid valve manifold according to the present embodiment has a plug-in type structure, and the 1 st pilot valve 41 and the 2 nd pilot valve 42 are incorporated in the manifold block MB, and the 1 st connection terminal 91 of the 1 st pilot valve 41 and the 2 nd connection terminal 92 of the 2 nd pilot valve 42 are connected to the 1 st terminal 94 and the 2 nd terminal 95 of the manifold block MB, respectively.

Next, the operation of the present embodiment will be described.

As shown in fig. 3, for example, the power supply from the circuit board 93 to the coil 47 of the solenoid 46 of the 1 st pilot valve 41 is cut off via the 1 st terminal 94 and the 1 st connection terminal 91, and the power supply from the circuit board 93 to the coil 47 of the solenoid 46 of the 2 nd pilot valve 42 is supplied via the 2 nd terminal 95 and the 2 nd connection terminal 92.

At this time, the coil 47 of the 2 nd pilot valve 42 is excited, and magnetic flux passing through the magnetic frame 45, the fixed iron core 48, the plunger 49, and the magnetic core 52 is generated around the coil 47. Then, the fixed core 48 generates an attractive force in accordance with the excitation of the coil 47, and the plunger 49 is attracted to the fixed core 48 against the biasing force of the plunger spring 50. Therefore, the pilot valve spool 56 of the 2 nd pilot valve 42 moves in a direction away from the 1 st valve seat 57 by the biasing force of the spool spring 59, and is seated on the 2 nd valve seat 58.

In this way, the supply flow path 61 and the 1 st output flow path 62 of the 2 nd pilot valve 42 communicate with each other through the valve chamber 55, and the communication between the 1 st output flow path 62 and the 1 st discharge flow path 64 via the valve chamber 55d is blocked. Then, the compressed fluid from the fluid supply source is supplied as a pilot fluid to the 2 nd pilot pressure acting chamber 38 through the pilot fluid supply flow path 73, the supply flow path 61 of the 2 nd pilot valve 42, the valve chamber 55, the 1 st output flow path 62, and the pilot fluid output flow path 74.

On the other hand, the coil 47 of the solenoid 46 of the 1 st pilot valve 41 is not supplied with electric power, and the attraction force of the fixed iron core 48 due to the excitation of the coil 47 in the 1 st pilot valve 41 disappears. In this way, the plunger 49 is moved in a direction away from the fixed core 48 by the biasing force of the plunger spring 50. Further, the pilot valve body 56 of the 1 st pilot valve 41 is pressed against the biasing force of the valve body spring 59 toward the 1 st valve seat 57 by the pair of valve pressing portions 49a of the plunger 49, and then is seated on the 1 st valve seat 57.

In this way, the 1 st output flow path 62 and the 1 st discharge flow path 64 of the 1 st pilot valve 41 communicate with each other via the valve chamber 55, and the communication between the supply flow path 61 and the 1 st output flow path 62 via the valve chamber 55 is blocked. The pilot fluid in the 1 st pilot pressure acting chamber 34 is discharged to the pilot fluid discharge flow path 77 via the pilot fluid output flow path 76, the 2 nd output flow path 63 of the 2 nd pilot valve 42, the output flow path communication concave portion 66, the 1 st output flow path 62 of the 1 st pilot valve 41, the valve chamber 55, the 1 st discharge flow path 64, the discharge flow path communication concave portion 67 of the 2 nd pilot valve 42, and the 2 nd discharge flow path 65. The pilot fluid discharged to the pilot fluid discharge flow path 77 is discharged to the atmosphere via the pilot fluid discharge flow path 75, the 1 st check valve 89a, the 1 st block side pilot fluid discharge flow path 86, and the 1 st block discharge flow path 84.

In this way, the 1 st pilot valve 41 can discharge the pilot fluid in the 1 st pilot pressure working chamber 34 and the 2 nd pilot valve 42 can supply the pilot fluid to the 2 nd pilot pressure working chamber 38. In this way, the spool 15 moves toward the 1 st piston accommodating recess 31. As a result, the supply port 17 and the 2 nd output port 19 are communicated with each other, and the 1 st output port 18 and the 1 st discharge port 20 are communicated with each other. Further, between the supply port 17 and the 1 st output port 18 is sealed by the 1 st spool seal 26 of the 1 st valve portion 151, and between the 2 nd output port 19 and the 2 nd discharge port 21 is sealed by the 4 th spool seal 29 of the 4 th valve portion 154.

When the spool 15 moves toward the 1 st piston accommodating recess 31, the fluid in the pilot fluid discharge flow path 75 flows into a space located on the opposite side of the 1 st pilot pressure acting chamber 34 with respect to the 1 st piston 32, among the spaces in the 1 st piston accommodating recess 31, through between the 1 st coupling block 13 and the housing body 12. When the spool 15 moves toward the 1 st piston accommodating recess 31, the fluid in the space on the opposite side of the 2 nd piston 36 from the 2 nd piston accommodating recess 35 to the 2 nd pilot pressure acting chamber 38 flows into the pilot fluid discharge flow path 78 through the space between the 2 nd coupling block 14 and the housing main body 12.

Then, the fluid from the fluid supply source is supplied to the fluid pressure machine via the block supply passage 81, the supply port 17, the 2 nd output port 19, and the 2 nd block output passage 83. Further, the fluid from the fluid pressure machine is discharged to the atmosphere via the 1 st block output flow path 82, the 1 st output port 18, the 1 st discharge port 20, and the 1 st block discharge flow path 84.

For example, the coil 47 of the solenoid 46 of the 1 st pilot valve 41 is supplied with electric power from the circuit board 93 via the 1 st terminal 94 and the 1 st connection terminal 91. On the other hand, the power supply from the circuit board 93 to the coil 47 of the solenoid 46 of the 2 nd pilot valve 42 via the 2 nd terminal 95 and the 2 nd connection terminal 92 is cut off.

At this time, the coil 47 of the 1 st pilot valve 41 is excited, and a magnetic flux passing through the magnetic frame 45, the fixed iron core 48, the plunger 49, and the magnetic core 52 is generated around the coil 47. Then, the fixed core 48 generates an attractive force in accordance with the exciting action of the coil 47, and the plunger 49 is attracted to the fixed core 48 against the biasing force of the plunger spring 50. Therefore, the pilot valve core 56 of the 1 st pilot valve 41 moves in a direction away from the 1 st valve seat 57 by the biasing force of the valve core spring 59, and is seated on the 2 nd valve seat 58.

In this way, the supply flow path 61 and the 1 st output flow path 62 of the 1 st pilot valve 41 communicate with each other through the valve chamber 55, and the communication between the 1 st output flow path 62 and the 1 st discharge flow path 64 via the valve chamber 55 is blocked. The compressed fluid from the fluid supply source is supplied as a pilot fluid to the 1 st pilot pressure acting chamber 34 via the pilot fluid supply passage 73, the supply passage 61 of the 2 nd pilot valve 42, the supply passage 61 of the 1 st pilot valve 41, the valve chamber 55, the 1 st output passage 62, the output passage communication recess 66 of the 2 nd pilot valve 42, the 2 nd output passage 63, and the pilot fluid output passage 76.

On the other hand, since the coil 47 of the solenoid 46 of the 2 nd pilot valve 42 is not supplied with electric power, the attraction force of the fixed iron core 48 due to the excitation of the coil 47 in the 2 nd pilot valve 42 disappears. In this way, the plunger 49 is moved in a direction away from the fixed core 48 by the biasing force of the plunger spring 50. Therefore, the pilot valve core 56 of the 2 nd pilot valve 42 is pressed against the biasing force of the valve core spring 59 toward the 1 st valve seat 57 by the pair of valve pressing portions 49a of the plunger 49, and then is seated on the 1 st valve seat 57.

In this way, the 1 st output flow path 62 and the 1 st discharge flow path 64 of the 2 nd pilot valve 42 communicate with each other via the valve chamber 55, and the communication between the supply flow path 61 and the 1 st output flow path 62 via the valve chamber 55 is blocked. The pilot fluid in the 2 nd pilot pressure acting chamber 38 is discharged to the atmosphere via the pilot fluid output flow path 74, the 1 st output flow path 62 of the 2 nd pilot valve 42, the valve chamber 55, the 1 st discharge flow path 64, the pilot fluid discharge flow path 75, the 1 st check valve 89a, the 1 st block side pilot fluid discharge flow path 86, and the 1 st block discharge flow path 84.

In this way, the 1 st pilot pressure working chamber 34 is supplied with the pilot fluid by the 1 st pilot valve 41, and the 2 nd pilot pressure working chamber 38 is discharged with the 2 nd pilot valve 42, so that the spool 15 moves toward the 2 nd piston accommodating recess 35. As a result, the supply port 17 and the 1 st output port 18 communicate with each other, and the 2 nd output port 19 and the 2 nd discharge port 21 communicate with each other. Further, between the supply port 17 and the 2 nd output port 19 is sealed by the 3 rd spool seal 28 of the 3 rd valve portion 153, and between the 1 st output port 18 and the 1 st discharge port 20 is sealed by the 2 nd spool seal 27 of the 2 nd valve portion 152.

When the spool 15 moves toward the 2 nd piston accommodating recess 35, the fluid in the space on the opposite side of the 1 st pilot pressure acting chamber 34 with respect to the 1 st piston 32 among the spaces in the 1 st piston accommodating recess 31 flows into the pilot fluid discharge flow path 75 through between the 1 st coupling block 13 and the housing main body 12. When the spool 15 moves toward the 2 nd piston accommodating recess 35, the fluid in the pilot fluid discharge flow path 78 flows into a space located on the opposite side of the 2 nd pilot pressure acting chamber 38 with respect to the 2 nd piston 3, of the spaces in the 2 nd piston accommodating recess 35, through between the 2 nd coupling block 14 and the housing body 12.

Then, the fluid from the fluid supply source is supplied to the fluid pressure machine through the block supply passage 81, the supply port 17, the 1 st output port 18, and the 1 st block output passage 82. Further, the fluid from the fluid pressure machine is discharged to the atmosphere via the 2 nd block output flow path 83, the 2 nd output port 19, the 2 nd discharge port 21, and the 2 nd block discharge flow path 85.

Therefore, the 1 st pilot valve 41 supplies and discharges the pilot fluid to and from the 1 st pilot pressure acting chamber 34. The 2 nd pilot valve 42 supplies and discharges the pilot fluid to and from the 2 nd pilot pressure acting chamber 38. The 1 st output flow path 62 and the 2 nd output flow path 63 supply and discharge the pilot fluid to and from the 1 st pilot pressure working chamber 34 or the 2 nd pilot pressure working chamber 38. Further, the 1 st discharge flow path 64 and the 2 nd discharge flow path 65 discharge the pilot fluid in the 1 st pilot pressure operation chamber 34 or the 2 nd pilot pressure operation chamber 38.

The pilot-operated solenoid valve 10 of the present embodiment is of an internal pilot type, and supplies a part of the fluid supplied from the supply port 17 to the 1 st and 2 nd pilot

pressure operating chambers

34 and 38. In the pilot-operated solenoid valve 10, the spool 15 is moved back and forth in the housing 11 by the pilot fluid, and the communication between the ports can be switched.

However, the supply flow path 61, the output flow path communication concave portion 66 of the 1 st pilot valve 41, and the discharge flow path communication concave portion 67 are in a state of opening to the 2 nd surface 442 of the 1 st pilot valve 41. Therefore, in the present embodiment, the portion of the supply flow path 61 of the 1 st pilot valve 41 that is open to the 2 nd surface 442, the output flow path communication concave portion 66 of the 1 st pilot valve 41, and the discharge flow path communication concave portion 67 are closed by the closing portion 70b of the fixing clip 70. The bent portion 70d of the fixing clip 70 is in a state in which the closing portion 70b is pressed against the 2 nd surface 442 of the flow path forming block 44 of the 1 st pilot valve 41 with its restoring force as biasing force. Therefore, the following states are obtained: the flow path of the 1 st pilot valve 41 that opens to the 2 nd surface 442 is closed by the closing portion 70b of the fixing clip 70, and the packing 72 is compressed between the closing portion 70b and the 2 nd surface 442 of the flow path forming block 44 of the 1 st pilot valve 41 by the biasing force of the bent portion 70 d.

The effects of the present embodiment will be described.

(1-1) the flow path that opens to the outside in the pilot type electromagnetic valve 10, that is, the flow path that opens to the 2 nd surface 442 of the valve body 60 in the 1 st pilot valve 41 is closed by the closing portion 70b of the fixing clip 70. The bent portion 70d is in a state where the closing portion 70b is pressed against the 2 nd surface 442 of the valve body 60 in the 1 st pilot valve 41. Therefore, the packing 72 is compressed between the closing portion 70b and the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41, and therefore, leakage of the pilot fluid to the outside can be suppressed while securing high sealability. The 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by a fixing clip 70. In this way, it is not necessary to form screw insertion holes through which screws are inserted in the flow passage forming block 44, for example, as in the case where the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 using screws. Therefore, since a space for forming the screw insertion hole in the flow passage forming block 44 can be saved, the flow passage cross-sectional area of each flow passage can be enlarged. Therefore, the cross-sectional area of the flow path can be increased while suppressing leakage of the pilot fluid to the outside while ensuring high sealing performance.

(1-2) the bent portion 70d of the fixing clip 70 has a spring structure. Therefore, in the state where the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, that is, in the 2 nd state, the restoring force acting on the bent portion 70d causes the closing portion 70b to be in close contact with the flow path of the 1 st pilot valve 41 that opens toward the 2 nd surface 442 of the valve body 60 as the biasing force. That is, the flow path of the 1 st pilot valve 41 that opens to the 2 nd surface 442 of the valve body 60 can be more firmly closed. Therefore, the sealability of the fixing clip 70 with respect to the 1 st pilot valve 41 can be improved.

(1-3) in order to bring the closing portion 70b into a state of being pressed against the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41, it is preferable that the closing portion 70b is deformed so as to pivot with an end portion of the bent portion 70d on the side opposite to the connection portion 70c as a starting point.

In this regard, in the present embodiment, since the bent portion 70d is bent in an arc shape, the closing portion 70b is easily rotated when the fixing clip 70 moves from the 1 st state to the 2 nd state. Further, since the restoring force is easily generated in the bent portion 70d, the flow path of the 1 st pilot valve 41 that opens toward the 2 nd surface 442 of the valve body 60 can be stably closed by the closing portion 70 b.

(1-4) since the pair of extending portions 70a are flat, when the rectangular block-shaped valve elements 60 are sandwiched between the pair of extending portions 70a, the pair of extending portions 70a can be brought into surface contact with the valve elements 60. That is, the 1 st pilot valve 41 and the 2 nd pilot valve 42 can be stably fixed to the housing 11.

(1-5) A pair of side surfaces 443 of each valve body 60 are provided with the 1 st guide groove 71 a. The 2 nd guide groove 71b is provided on a side surface of the housing 11 coupled to the pair of side surfaces 443 of the valve body 60 of the 2 nd pilot valve 42, that is, on a side surface of the 1 st joint 132. The 1 st guide groove 71a and the 2 nd guide groove 71b constitute guide grooves. Therefore, the 1 st pilot valve 41 and the 2 nd pilot valve 42 can be easily fixed to the housing 11 by the pair of extensions 70 a.

(1-6) when the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, the pair of extending portions 70a of the fixing clip 70 and the locking projection 71f of the housing 11 may be in a state of being positionally deviated. In this case, even if the locking projection 71f is not fitted in a desired position in the circular locking hole 70h formed in the pair of extending portions 70a, the inner peripheral surface of the locking hole 70h of the pair of extending portions 70a moves along the arc-shaped outer peripheral surface of the locking projection 71f, and therefore the locking projection 71f moves relatively to the desired position in the locking hole 70 h. That is, since the pair of extending portions 70a are moved to a desired position, the fixed state in which the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70 can be stabilized.

(1-7) a portion of the outer circumferential surface of the latching protrusion 71f facing the valve body 60 of the 2 nd pilot valve 42 is formed as a tapered surface 71 g. Therefore, when the locking holes 70h of the pair of extending portions 70a of the fixing clip 70 are engaged with the locking projections 71f of the housing 11, the pair of extending portions 70a are guided by the tapered surfaces 71g of the locking projections 71f, and the interval between the pair of extending portions 70a is enlarged. When the locking projection 71f reaches a position overlapping the locking hole 70h, the locking projection 71f is fitted into the locking hole 70h, and the pair of extending portions 70a is fixed to the housing 11. That is, the operator can easily fix the fixing clip 70 to the housing 11 without forcibly fitting the locking projection 71f into the locking hole 70h by expanding the distance between the pair of extending portions 70a of the fixing clip 70.

(1-8) since a space for forming the screw insertion hole can be saved in the flow path forming block 44, the 1 st pilot valve 41 and the 2 nd pilot valve 42 can be downsized.

(1-9) each flow path forming block 44 of the 1 st pilot valve 41 and the 2 nd pilot valve 42 has the same flow path structure. Therefore, it is not necessary to prepare 2 types of flow passage forming blocks having different flow passage structures in order to supply and discharge the pilot fluid to and from the 1 st pilot pressure working chamber 34 and the 2 nd pilot pressure working chamber 38, and therefore, the production efficiency of the pilot type solenoid valve 10 can be improved.

(1-10) when the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by screws, there is a possibility that the flow passage forming block 44 of the 1 st pilot valve 41 is partially deformed by the fastening force of the screws. In this way, the sealing performance of the packing 72 disposed on the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41 may be unstable.

In this regard, in the present embodiment, since the 1 st pilot valve 41 receives the biasing force of the fixing clip 70 in a planar manner by the closing portion 70b, the deformation of the flow passage forming block 44 of the 1 st pilot valve 41 can be suppressed. Therefore, the sealing performance of the packing 72 disposed on the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41 is stabilized.

< embodiment 2 >

Hereinafter, embodiment 2 of a pilot-operated solenoid valve will be described with reference to fig. 13 and 14. The same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 13, the fixing clip 70 is composed of a pair of extending portions 70a, a connecting portion 70c, and a spring portion 70g, and is different from embodiment 1. The connection portion 70C extends in the 3 rd direction C. The connecting portion 70c has the same shape as the 2 nd surface 442 of the flow path forming block 44 in a plan view.

The spring portions 70g are provided in the pair of extending portions 70a, respectively. The pair of spring portions 70g are provided at positions facing each other in the 2 nd direction B. The spring portion 70g extends in a wave shape in the 1 st direction a. The spring portion 70g is formed in a wave shape so as to meander between the 1 st edge and the 2 nd edge of the extension portion 70a in the 3 rd direction C. The spring portion 70g has a plurality of portions extending in the 3 rd direction C. In the 1 st state before the fixing clip 70 is fixed to the housing 11, the intervals of these plural portions of the spring portion 70g in the 1 st direction a are substantially constant. That is, the spring portion 70g has a plurality of portions extending substantially parallel to each other in the 3 rd direction C.

As shown in fig. 14, in the 2 nd state in which the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, the connecting portion 70c of the fixing clip 70 abuts on the entire 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41. The connection portion 70c closes the flow path of the flow path forming block 44 of the 1 st pilot valve 41 that opens to the 2 nd surface 442. That is, the connection portion 70c serves as a closing portion that closes the flow path in which the flow path forming block 44 of the 1 st pilot valve 41 opens to the 2 nd surface 442 in the 2 nd state. Then, the pair of extension portions 70a is fixed to the 1 st joint 132. In this way, the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the 1 st joint 132 by the fixing clip 70 in a state of being sandwiched between the connecting portion 70c of the fixing clip 70 and the 1 st joint 132. Therefore, the fixing clip 70 fixes the 1 st pilot valve 41 and the 2 nd pilot valve 42 to the housing 11. The packing 72 disposed on the 2 nd surface 442 of the flow path forming block 44 of the 1 st pilot valve 41 is pressed toward the flow path forming block 44 of the 1 st pilot valve 41 by the connecting portion 70c of the fixing clip 70.

As shown in fig. 13 and 14, in the 2 nd state, the interval in the 1 st direction a among the plurality of portions of the spring portion 70g extending in the 3 rd direction C is larger than that in the 1 st state. Therefore, the length L2 of the spring portion 70g in the 2 nd state is longer than the length L1 of the spring portion 70g in the 1 st state. That is, in the 2 nd state, the spring portion 70g extends longer than in the 1 st state.

The operation of the present embodiment will be described.

The spring portion 70g generates a restoring force to be contracted to restore to the 1 st state. Therefore, the connection portion 70c is pressed against the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41 by the restoring force of the spring portion 70g of the fixing clip 70. That is, the spring portion 70g functions as a biasing portion that biases the connection portion 70c toward the 2 nd surface 442 of the flow passage forming block 44 of the 1 st pilot valve 41. The spring portion 70g generates a biasing force to bias the connection portion 70c toward the 2 nd surface 442. Therefore, the flow path of the 1 st pilot valve 41 that is open to the 2 nd surface 442 is closed by the connecting portion 70c of the fixing clip 70, and the packing 72 is compressed between the closing portion 70b and the 2 nd surface 442 of the flow path forming block 44 of the 1 st pilot valve 41 by the biasing force of the spring portion 70 g.

The effects of the present embodiment will be described.

(2-1) the spring portion 70g of the fixing clip 70 has a spring structure. Therefore, in the state where the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, that is, in the 2 nd state, the restoring force acting on the spring portion 70g as the biasing force causes the connecting portion 70c to be in close contact with the flow path of the 1 st pilot valve 41 that is open to the 2 nd surface 442 of the valve body 60. That is, the flow path of the 1 st pilot valve 41 that opens to the 2 nd surface 442 of the valve body 60 can be more firmly closed. Therefore, the sealability of the fixing clip 70 to the 1 st pilot valve 41 can be improved.

< embodiment 3 >

Hereinafter, embodiment 3 of the pilot-operated solenoid valve will be described with reference to fig. 15. The same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 15, the 1 st guide wall 71c is provided on a pair of side surfaces 443 of each valve body 60 of the 1 st pilot valve 41 and the 2 nd pilot valve 42. The 1 st guide wall 71C protrudes from an edge of each valve element 60 in the 3 rd direction C. The 1 st guide wall 71c has a rectangular plate shape extending in the 1 st direction a. The 1 st guide wall 71c is disposed to constitute a part of the 1 st guide groove 71 a. The pair of extending portions 70a of the fixing clip 70 have the 1 st edge portion and the 2 nd edge portion, respectively, the 1 st edge portion being located on the side corresponding to the bent portion 70d (or the base end of the closing portion 70b), and the 2 nd edge portion being located on the side corresponding to the tip end of the closing portion 70 b. The 1 st guide wall 71c is provided along the 1 st edge of the pair of extensions 70 a. The 1 st joint 132 has the 2 nd guide wall 71d provided on each side surface connected to the pair of side surfaces 443 of the flow passage forming block 44 of the 2 nd pilot valve 42, and the 2 nd guide wall 71d extends so as to be connected to the 1 st guide wall 71 c. The 2 nd guide wall 71d protrudes from the edge of the 1 st joint 132 in the 3 rd direction C. The 2 nd guide wall 71d takes the form of a rectangular plate extending in the 1 st direction a. The 2 nd guide wall 71d is disposed to constitute a part of the 2 nd guide groove 71 b. The 2 nd guide wall 71d is provided along the 1 st edge of the pair of extensions 70 a. In a state where the 1 st guide wall 71c is joined to the 2 nd guide wall 71d, the inner surface of the 1 st guide wall 71c is flush with the inner surface of the 2 nd guide wall 71 d. Therefore, the pair of side surfaces 443 of the valve body 60 and the side surface of the housing 11 coupled to the pair of side surfaces 443 of the valve body 60 of the 2 nd pilot valve 42 constitute guide walls for guiding the 1 st edge of the pair of extensions 70a by the 1 st guide wall 71c and the 2 nd guide wall 71 d.

The operation of the present embodiment will be described.

When the fixing clip 70 is fixed to the housing 11, the 1 st edge portions of the pair of extending portions 70a of the fixing clip 70 are guided by the 1 st guide wall 71c and the 2 nd guide wall 71 d. Before the locking projections 71f are fitted into the locking holes 70h of the pair of extending portions 70a, the tip of the closing portion 70b of the fixing clip 70 abuts on the 2 nd surface of the valve body 60 of the 1 st pilot valve 41. In this state, when the fixing clip 70 is moved toward the housing 11, the closing portion 70b is deformed to approach the connecting portion 70 c. At this time, the closing portion 70b is deformed to rotate with the 2 nd end of the bent portion 70d as a starting point. Accordingly, a rotational force is applied to the pair of extension portions 70a, and the extension portions 70a are rotated from the 2 nd edge toward the 1 st edge with the closing portion 70b as a starting point. Here, even if the pair of extending portions 70a are given the rotational force, the 1 st edge portions of the pair of extending portions 70a abut against the 1 st guide wall 71c and the 2 nd guide wall 71d, and the rotation of the pair of extending portions 70a is restricted.

The effects of the present embodiment will be described.

(3-1) the rotation of the pair of extensions 70a caused by the restoring force acting on the closing portion 70b can be restricted by the 1 st guide wall 71c and the 2 nd guide wall 71 d. Therefore, the fixing clip 70 can be more accurately fixed to the housing 11.

(3-2) when the pair of extending portions 70a are guided by the guide wall, the pair of extending portions 70a are rotated by a restoring force acting on the closing portion 70b, and assume a state of being inclined with respect to the 1 st direction a. Even in such a state, when the locking projection 71f is fitted into the locking hole 70h, the inner peripheral surface of the locking hole 70h moves along the arc-shaped outer peripheral surface of the locking projection 71 f. Therefore, the locking projection 71f moves relatively to the required position of the locking hole 70 h. That is, since the pair of extending portions 70a are moved to desired positions, when the pair of extending portions 70a are fixed to the housing 11, the inclination of the pair of extending portions 70a with respect to the 1 st direction a can be corrected. Therefore, the mounting accuracy of the fixing clip 70 to the housing 11 can be improved by the 1 st and 2

nd guide walls

71c and 71d, the locking projection 71f, and the locking hole 70 h.

< embodiment 4 >

Hereinafter, embodiment 4 of the pilot type solenoid valve will be described with reference to fig. 16 and fig. 17A and 17B. The same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 16, the connecting portion 70c has a rectangular plate shape. The longitudinal direction of the joint 70C is the 3 rd direction C, and the lateral direction of the joint 70C is the 2 nd direction B. A pair of extension portions 70a are connected to both ends of the connecting portion 70C in the 2 nd direction B and to the 1 st end of the connecting portion 70C in the 3 rd direction C. The 2 nd end of the connecting portion 70C in the 3 rd direction C is disposed at: a position apart from the pair of extensions 70a in the 3 rd direction C.

In a portion of the connecting portion 70c sandwiched between the pair of extending portions 70a, a plate surface 70i of the connecting portion 70c is formed with a recessed portion 70e recessed in the plate thickness direction of the connecting portion 70 c. A screw hole 70f is formed in the bottom surface of the recess 70 e. The screw hole 70f penetrates the connection portion 70c in the plate thickness direction. The screw hole 70f is screwed with the screw 80. The screw 80 has a shaft portion 811 and a head portion 812, the shaft portion 811 having a cylindrical shape and a male thread 811a formed on an outer peripheral surface thereof, and the head portion 812 provided on the 1 st end side of the shaft portion 811.

As shown in fig. 17A, the screw 80 has an incomplete screw portion 813. The half screw portion 813 is formed integrally with the 1 st end of the shaft portion 811. The head portion 812 is formed integrally with the incomplete screw portion 813. The incomplete screw portion 813 has a truncated cone shape. The outer peripheral surface of the incomplete screw portion 813 is not formed with a male thread. The outer peripheral surface of the incomplete screw portion 813 is inclined such that the diameter increases from the shaft portion 811 toward the head portion 812.

The 2 nd end of the connecting portion 70C in the 3 rd direction C is provided with a bent portion 70 d. The bent portion 70d is provided on the same side as the pair of extending portions 70a with respect to a virtual plane Vp extending along the plate surface 70i of the connecting portion 70 c. That is, the bent portion 70d is bent in an arc shape so as not to protrude beyond the virtual plane Vp on the side opposite to the pair of extended portions 70 a.

The leading end of the closing portion 70b is disposed at the same position as the 1 st end in the 3 rd direction C of the connecting portion 70C. Fig. 16 shows a state before the fixing clip 70 is fixed to the housing 11, i.e., a 1 st state.

As shown in fig. 17A, in the 1 st state, the closing portion 70b and the connecting portion 70c of the fixing clip 70 are separated. In the 1 st state, the interval D1 between the closing portion 70b and the connecting portion 70C becomes gradually larger as it gets farther from the bent portion 70D in the 3 rd direction C. That is, the closing portion 70b is in an inclined state with respect to the connecting portion 70c in the 1 st state.

As shown in fig. 17B, the closing portion 70B of the fixing clip 70 is closer to the connecting portion 70c in the 2 nd state than in the 1 st state. Further, the closing portion 70b and the connecting portion 70c are also separated in the 2 nd state. That is, the interval D2 between the closing portion 70b and the connecting portion 70c in the 2 nd state is smaller than the interval D1 between the closing portion 70b and the connecting portion 70c in the 1 st state. In the 2 nd state, the closing portion 70b and the connecting portion 70c are parallel. That is, the interval between the closing portion 70b and the connecting portion 70c is fixed over the entire area of the space between the closing portion 70b and the connecting portion 70 c.

As shown in fig. 17A and 17B, when the state 1 is shifted to the state 2, the closing portion 70B of the fixing clip 70 is deformed with the 2 nd end of the bent portion 70d as a starting point. Therefore, a restoring force to restore to the 1 st state is generated in the closing portion 70 b. Therefore, since the bent portion 70d forms a spring structure, the closing portion 70b is pressed against the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41 in the 2 nd state. Therefore, the bent portion 70d functions as a biasing portion that biases the closing portion 70b toward the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41. In state 2, shaft portion 811 of screw 80 is inserted through screw hole 70 f. When the shaft portion 811 is inserted into the screw hole 70f, the male thread 811a of the shaft portion 811 is screwed into the screw hole 70 f. At this time, the incomplete screw portion 813 of the screw 80 enters the recess 70e of the connecting portion 70 c. That is, the recess 70e functions as a space in which the incomplete screw portion 813 of the screw 80 can be retracted. In a state where the 2 nd end of the shaft portion 811 abuts against the closing portion 70b, the shaft portion 811 is screwed into the screw hole 70f, and the axial force of the screw 80 is transmitted to the 2 nd surface 442 via the closing portion 70 b. That is, the axial force of the screw 80 is a biasing force that presses the closing portion 70b against the 2 nd surface 442.

The operation and effect of the present embodiment will be described.

(4-1) since the axial force of the screw 80 can press the closing portion 70b against the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41 in addition to the biasing force of the bent portion 70d, the leakage of the pilot fluid to the outside can be further suppressed.

(4-2) the bent portion 70d is configured to protrude to the opposite side of the pair of extending portions 70a so as not to exceed the plate surface 70i of the connecting portion 70 c. Therefore, the size of the fixing clip 70 can be reduced, and the increase in size of the pilot type solenoid valve 10 can be suppressed.

(4-3) when the screw 80 is inserted into the screw hole 70f, the incomplete screw portion 813 enters the inside of the recess 70 e. Therefore, the screw 80 can be screwed into the screw hole 70f without the incomplete screw portion 813 being interfered by the plate surface 70i of the connecting portion 70 c. Therefore, the axial force of the screw 80 is easily transmitted to the closing portion 70b, with the result that the biasing force is easily transmitted to the 2 nd surface 442. Therefore, the leakage of the pilot fluid to the outside can be further suppressed.

However, the above embodiments may be modified as follows. The above embodiments and the following modifications can be combined and implemented within a range not technically contradictory to each other.

Although the bent portion 70d functions as the biasing portion in embodiment 1 and the spring portion 70g functions as the biasing portion in embodiment 2, the fixing clip 70 may include both the bent portion 70d and the spring portion 70g as the biasing portion. At this time, the bent portion 70d and the spring portion 70g of the fixing clip 70 constitute a spring structure. Therefore, in the 2 nd state, which is a state in which the 1 st pilot valve 41 and the 2 nd pilot valve 42 are fixed to the housing 11 by the fixing clip 70, the restoring force acting on the bent portion 70d and the spring portion 70g serves as a biasing force to bring the closing portion 70b into close contact with the flow path in which the valve body 60 of the 1 st pilot valve 41 is opened to the 2 nd surface 442. That is, the flow path in which the valve body 60 of the 1 st pilot valve 41 opens to the 2 nd surface 442 can be more firmly closed. Therefore, the sealability of the fixing clip 70 with respect to the 1 st pilot valve 41 can be improved.

In each of the above embodiments, the tapered surface 71g of the locking projection 71f may be changed to, for example, a vertical surface perpendicular to the side surface of the 1 st joint 132 of the housing 11. That is, the locking projection 71f may have a half-moon shape when viewed from the 2 nd direction B. In the case of this modification, the projecting amount of the locking projection 71f may be changed so that the pair of extending portions 70a of the fixing clip 70 can be easily fixed to the housing 11.

In each of the above embodiments, the locking projection 71f may be changed to a cylindrical shape. At this time, a portion of the outer peripheral surface of the locking projection 71f on the opposite side of the valve body 60 of the 2 nd pilot valve 42 may be in an arc shape that follows the inner peripheral surface of the locking hole 70h, or may be in an arc shape that does not follow the inner peripheral surface of the locking hole 70 h. That is, as long as the fixing clip 70 can be fixed to the housing 11 when the locking projection 71f is fitted into the locking hole 70h, the shape of the locking projection 71f can be arbitrarily changed.

In each of the above embodiments, as long as the fixing clip 70 can be fixed to the housing 11 when the locking projection 71f is fitted into the locking hole 70h, the shape of the locking hole 70h is not limited to a circular hole shape, and may be changed to any shape, for example, a rectangular hole shape.

In each of the above embodiments, the pair of extending portions 70a have a flat plate shape, but may have a rod shape, for example. The connecting portion 70c is in the form of a rectangular plate, but may be in the form of a plate in embodiment 4. In embodiments 1 to 3, the connecting portion 70c may have a rod shape. In each of the above embodiments, the bent portion 70d may have a rod shape.

In each of the above embodiments, the guide grooves formed by the 1 st guide groove 71a and the 2 nd guide groove 71b may be omitted. At this time, the pair of extension portions 70a of the fixing clip 70 are attached to the pair of side surfaces 443 of the valve body 60 of the 1 st pilot valve 41 and the 2 nd pilot valve 42 and the side surface of the 1 st joint 132 connected to the pair of side surfaces 443. The locking projection 71f is modified to be provided on the side surface of the 1 st joint 132 connected to the pair of side surfaces 443.

In embodiment 1 and embodiment 3, the bent portion 70d is bent in an arc shape, but the invention is not limited thereto. The bent portion 70d may be formed of, for example: a 1 st extending portion extending from one of both edge portions of the connecting portion 70C in the 3 rd direction C so as to be apart from the connecting portion 70C, a 2 nd extending portion extending from an end of the 1 st extending portion toward the distal ends of the pair of extending portions 70a, and a 3 rd extending portion extending from an end of the 2 nd extending portion toward a space between the pair of extending portions 70 a. That is, the bent portion 70d may have a quadrangular portion when viewed from the 2 nd direction B. The shape of the bent portion 70d may be changed to any shape as long as it can generate a biasing force for pressing the closing portion 70b against the 2 nd surface 442 of the valve body 60 of the 1 st pilot valve 41.

In embodiment 1 and embodiment 3, the closing portion 70b is still separated from the connecting portion 70c in the state 2, but the invention is not limited thereto. For example, the state of the closure portion 70b may be changed to the state of contacting the connection portion 70c in the 2 nd state. It is important that the closing portion 70b is separated from the connecting portion 70c in at least the 1 st state of the 1 st state and the 2 nd state.

In embodiment 3, the guide wall may be formed only by the 1 st guide wall 71c provided in the 1 st and 2

nd guide valves

41 and 42. That is, the 2 nd guide wall 71d of the 1 st joint 132 can be omitted. For example, the guide wall may be constituted only by the 1 st guide wall 71c provided in the 1 st pilot valve 41 and the 2 nd guide wall 71d provided in the 1 st joint 132. That is, the 1 st guide wall 71c of the 2 nd pilot valve 42 can be omitted.

In each of the above embodiments, the flow passage forming block 44 of the 1 st guide valve 41 and the 2 nd guide valve 42 may be configured without the 1 st discharge flow passage 64, the 2 nd discharge flow passage 65, and the discharge flow passage communication recess 67. The 1 st pilot valve 41 and the 2 nd pilot valve 42 may have a configuration in which a discharge flow path that opens to the 1 st surface 441 and the 2 nd surface 442 and communicates with the valve chamber 55 is formed in each flow path forming block 44.

In each of the above embodiments, for example, the packing 72 disposed on the 2 nd surface 442 of the flow passage forming block 44 of the 1 st guide valve 41 may be a packing of a different shape from the packing 72 disposed between the 1 st surface 441 of the flow passage forming block 44 of the 1 st guide valve 41 and the 2 nd surface 442 of the flow passage forming block 44 of the 2 nd guide valve 42. It is important to note that the packing disposed on the 2 nd surface 442 of the flow path forming block 44 of the 1 st pilot valve 41 may have any shape that can seal the supply flow path 61, the output flow path communication concave portion 66, and the discharge flow path communication concave portion 67 on the 2 nd surface 442 side.

In each of the above embodiments, the fixing clip 70 may be made of, for example, resin.

In the above embodiments, the flow path forming blocks 44 of the 1 st and 2

nd guide valves

41 and 42 have the same flow path structure, but the present invention is not limited thereto, and the flow path forming blocks 44 of the 1 st and 2

nd guide valves

41 and 42 may have different flow path structures. Even if the above-described modification is made, for example, if there is a flow path that opens to the 2 nd surface 442 in the valve body 60 of the 1 st pilot valve 41, the fixing clip 70 according to each of the above-described embodiments and the above-described modification can close the flow path.

In each of the above embodiments, the main valve portion V1 of the pilot type solenoid valve 10 may be a double three-port type directional control valve in which two spool bodies are accommodated in the valve hole 16, for example. The two spool valves are independently operated by the supply and discharge of the pilot fluid to and from the 1 st pilot pressure operation chamber 34 in the 1 st pilot valve 41 and the supply and discharge of the pilot fluid to and from the 2 nd pilot pressure operation chamber 38 in the 2 nd pilot valve 42.

Description of the reference numerals

10 leading type electromagnetic valve

11 casing

15 spool

17 supply port

18 th 1 output port

19 nd 2 output port

20 st discharge port

21 nd 2 nd discharge port

34 st 1 pilot pressure acting chamber

38 nd 2 pilot pressure acting chamber

41 st 1 pilot valve

42 nd 2 pilot valve

55 valve chamber

56 pilot valve core

57 1 st valve seat

58 nd 2 nd valve seat

60 valve body

61 supply flow path

62 st 1 output flow path

63 No. 2 output flow path

64 st discharge flow path

65 No. 2 discharge channel

66 output flow passage communication recess

67 discharge flow passage communication recess

70 fixation clamp

70a extending part

70b closure part

70c connecting part

70d bending part

70g spring part

70h clamping hole

70i plate surface

71c 1 st guide wall

71d No. 2 guide wall

71f locking projection

71g taper surface

72 liner

80 screw

441 st plane (1)

442 No. 2

443 side surface

Z1, Z2 open area

A1 st direction

B in the 2 nd direction

C3 rd direction

Vp virtual plane

Claims

1. A pilot-operated solenoid valve comprises a housing, a spool, a 1 st pilot pressure acting chamber, a 2 nd pilot pressure acting chamber, a 1 st pilot valve, and a 2 nd pilot valve;

the housing has a plurality of ports;

the spool moves back and forth within the housing, switching communication between the ports;

the 1 st pilot pressure acting chamber and the 2 nd pilot pressure acting chamber are respectively provided on both end sides of the spool in the housing;

the 1 st pilot valve supplies and discharges a pilot fluid to and from the 1 st pilot pressure acting chamber;

the 2 nd pilot valve supplies and discharges a pilot fluid to and from the 2 nd pilot pressure acting chamber;

the 1 st pilot valve and the 2 nd pilot valve are configured in an interconnected state;

the 1 st pilot valve and the 2 nd pilot valve are respectively provided with a rectangular block-shaped valve body, and the valve body is provided with a 1 st surface and a 2 nd surface on the side opposite to the 1 st surface;

the valve body is configured to: the 1 st surface of the valve body of the 1 st pilot valve abuts against the 2 nd surface of the valve body of the 2 nd pilot valve, and the 1 st surface of the valve body of the 2 nd pilot valve abuts against the housing;

each of the valve bodies has a plurality of flow paths through which a pilot fluid flows;

the plurality of flow paths include a flow path opening to the 2 nd surface of each of the valve bodies;

the method is characterized in that: is provided with a fixing clip which is provided with a fixing clip,

the fixing clamp fixes the 1 st pilot valve and the 2 nd pilot valve to the shell,

the fixing clamp is provided with a pair of extending parts, a sealing part and a spring part,

the pair of extending parts are fixed on the shell,

the pair of extending portions is fixed to the housing, so that the closing portion closes the flow path of the valve body of the 1 st pilot valve, which is open to the 2 nd surface, in a state where the closing portion cooperates with the housing to sandwich the 1 st pilot valve and the 2 nd pilot valve,

the biasing portion biases the closing portion toward the 2 nd surface of the valve body of the 1 st pilot valve,

a sealing member is disposed between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve, and the sealing member seals between the closing portion and the 2 nd surface of the valve body of the 1 st pilot valve.

2. The pilot operated solenoid valve as set forth in claim 1,

the fixing clip has a connecting portion connecting the pair of extending portions to each other,

the elastic pressing part is a bending part which is bent from the connecting part to the space between the pair of extending parts,

the closing portion is plate-shaped, extends from an end portion of the bent portion opposite to the connecting portion toward between the pair of extending portions, and is disposed between the pair of extending portions,

a state before the fixing clip is fixed to the housing is a 1 st state, a state after the 1 st pilot valve and the 2 nd pilot valve are fixed to the housing by the fixing clip is a 2 nd state,

at least in the 1 st state, the closing portion is spaced apart from the connecting portion, and the closing portion is closer to the connecting portion in the 2 nd state than in the 1 st state.

3. The pilot operated solenoid valve as set forth in claim 2,

the pair of extending portions respectively have a 1 st edge portion and a 2 nd edge portion,

the 1 st edge is located on a side corresponding to a base end of the closing portion,

the 2 nd edge part is positioned on the side corresponding to the front end of the closing part,

each of the valve bodies of the 1 st and 2 nd pilot valves has a pair of side surfaces connecting the 1 st surface and the 2 nd surface to each other,

the housing has a pair of side surfaces coupled to the pair of side surfaces of the 2 nd pilot valve, respectively,

a pair of side surfaces of at least the 1 st pilot valve and the 2 nd pilot valve or a pair of side surfaces of at least the 1 st pilot valve and the 2 nd pilot valve of the 1 st pilot valve, the 2 nd pilot valve, and the housing are provided with guide walls for guiding the 1 st edge of the pair of extended portions.

4. The pilot operated solenoid valve as set forth in claim 2,

the bending part is bent into an arc shape.

5. The pilot operated solenoid valve as set forth in claim 2,

the connecting part is in a plate shape,

a screw is screwed into the connecting portion so as to penetrate the connecting portion in a plate thickness direction,

in the 2 nd state, the screw presses the closing portion against the 2 nd surface of the valve body of the 1 st pilot valve.

6. The pilot operated solenoid valve as set forth in claim 5,

the connecting part is flat and has a plate surface facing to the opposite side of the extending parts,

the bent portion is disposed on the same side as the pair of extending portions with respect to an imaginary plane extending along the plate surface of the connecting portion.

7. The pilot operated solenoid valve as set forth in claim 1,

the closed part is plate-shaped and is connected with the pair of extending parts,

the spring-pressing part is a spring part,

the spring parts are respectively arranged on the pair of extending parts and extend in a wave-shaped manner in the extending direction of the pair of extending parts,

the spring portion is extended more in the 2 nd state than in the 1 st state.

8. The pilot operated solenoid valve as claimed in any one of claims 1 to 7,

the pair of extending parts are flat.

9. The pilot operated solenoid valve as set forth in claim 8,

the pair of extending portions have engaged portions engaged with a pair of engaging portions of the housing, respectively,

the locked part is a circular through hole penetrating the extending part in the plate thickness direction,

the locking portion is a columnar locking protrusion which protrudes from a side surface of the housing and is fitted into the through hole,

the portion of the outer peripheral surface of the locking protrusion on the opposite side of the valve body of the 2 nd pilot valve is formed in an arc shape that follows the inner peripheral surface of the through hole.

10. The pilot operated solenoid valve as set forth in claim 9,

a portion of an outer peripheral surface of the locking protrusion facing the valve body of the 2 nd pilot valve is formed as a tapered surface inclined as follows: the distal end of the locking projection is farther from the closing section as the proximal end of the locking projection is closer to the distal end.