CN111692147B

CN111692147B - Electromagnetic proportional valve, reversing valve and construction machine

Info

Publication number: CN111692147B
Application number: CN202010092331.8A
Authority: CN
Inventors: 岩崎仁; 西田裕平
Original assignee: Nabtesco Corp
Current assignee: Nabtesco Corp
Priority date: 2019-03-14
Filing date: 2020-02-14
Publication date: 2024-06-25
Anticipated expiration: 2040-02-14
Also published as: CN111692147A; JP7386614B2; KR20200110163A; KR102683097B1; JP2020148293A

Abstract

The invention provides a driving device, an electromagnetic proportional valve, a reversing valve and a construction machine. An electromagnetic proportional valve according to an embodiment of the present invention includes: a hollow housing extending in an axial direction; a driving member provided in the housing so as to be movable in the axial direction, for driving the spool; and a pin having a pin inclined surface inclined with respect to the axial direction. The pin is movable in a radial direction orthogonal to the axial direction from a1 st position where the pin is not in contact with the driving member to a 2 nd position radially inward of the 1 st position where the pin inclined surface is in contact with the driving member.

Description

Electromagnetic proportional valve, reversing valve and construction machine

Technical Field

The present disclosure relates to an electromagnetic proportional valve, a reversing valve, and a construction machine.

Background

An electromagnetic proportional valve is known that controls supply and discharge of pilot oil to and from a hydraulic device to be controlled by adjusting an exciting current applied to a solenoid actuator to move a position of a spool. The electromagnetic proportional valve is disclosed in Japanese patent application laid-open No. 2017-020541 (patent document 1).

In the electromagnetic proportional valve, if a failure occurs in an electrical system for controlling the solenoid actuator, there is a case where the spool is difficult or impossible to move. Therefore, a manual pin for manually changing the position of the spool may be provided in the electromagnetic proportional valve. An electromagnetic proportional valve including such a manual pin is disclosed in japanese patent application laid-open No. 2000-274547 (patent document 2).

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2017-020541

Patent document 2: japanese patent laid-open No. 2000-274547

Disclosure of Invention

Problems to be solved by the invention

As shown in patent document 2, a power cable for supplying power to a solenoid coil may be disposed on a side surface of a housing accommodating the solenoid coil. The electromagnetic proportional valve is sometimes used as a pilot valve for supplying control pressure to the directional control valve. In the construction machine, since the plurality of directional control valves are disposed so that the axial directions thereof are parallel to each other, it is difficult to compactly dispose the directional control valves that operate by the control pressure of the electromagnetic proportional valve when the electric power cable is led out from the side surface of the housing to the outside.

Therefore, it is considered to lead out the electric cable not from the side surface of the housing but from the end surface of the housing at the end in the axial direction. However, if the electric power cable is led out from the end face in the axial direction of the housing, the position where the electric power cable is led out interferes with the arrangement position of the manual pin. As described above, the conventional electromagnetic proportional valve including the manual pin for manually adjusting the position of the spool has a problem that it is difficult to draw out the electric cable from the end surface of the housing.

An object of the present disclosure is to provide a novel electromagnetic proportional valve capable of alleviating or solving at least some of the above-described problems of the related art. It is one of the more specific objects of the present disclosure to draw out an electrical cable from an axial end in an electromagnetic proportional valve that includes a manual pin for manually driving a spool. Other objects than the above objects of the present disclosure will be apparent from the entire description of the present specification.

Solution for solving the problem

The driving device according to an aspect of the present invention includes: a solenoid coil provided in the hollow portion of the housing; a driving member provided in the hollow portion and configured to drive a spool movable in an axial direction by applying an exciting current to the solenoid coil; and a pin having a pin inclined surface inclined with respect to the axial direction, the pin being movable in a radial direction orthogonal to the axial direction from a1 st position, in which the pin is not in contact with the driving member, to a2 nd position, in which the pin inclined surface is in contact with the driving member, on the inner side in the radial direction than the 1 st position.

The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a spool movable in an axial direction, the valve unit controlling a control pressure supplied to a control target by movement of the spool; a housing having a hollow portion; a solenoid coil provided in the hollow portion; a driving member provided in the hollow portion, the driving member being configured to drive the spool by applying an exciting current to the solenoid coil and thereby moving the solenoid coil in the axial direction; and a pin having a pin inclined surface inclined with respect to the axial direction, the pin being movable in a radial direction orthogonal to the axial direction from a1 st position, in which the pin is not in contact with the driving member, to a2 nd position, in which the pin inclined surface is in contact with the driving member, on the inner side in the radial direction than the 1 st position.

In one aspect of the present invention, the driving member has a driving member inclined surface having a shape complementary to the pin inclined surface, and the pin inclined surface is in contact with the driving member inclined surface when the pin is located at the 2 nd position.

The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a spool movable in an axial direction, the valve unit controlling a control pressure supplied to a control target by movement of the spool; a housing having a hollow portion; a solenoid coil provided in the hollow portion; a driving member provided in the hollow portion, the driving member being configured to drive the spool by applying an exciting current to the solenoid coil and thereby moving the solenoid coil in the axial direction; and a pin movable in a radial direction orthogonal to the axial direction from a1 st position, in which the pin is not in contact with the driving member, to a2 nd position, in which the pin is in contact with the driving member, on the inner side in the radial direction than the 1 st position, and in which the pin applies a thrust force in the axial direction to the driving member.

In one aspect of the present invention, the electromagnetic proportional valve includes a connector that closes the opening of the housing, and the pin is provided between the connector and the housing.

In one aspect of the present invention, the connector has a flat surface extending parallel to the axial direction, and the pin is provided on the flat surface.

In one embodiment of the present invention, the connector houses a part of a cable for applying exciting current to the solenoid coil.

The pin has a convex portion protruding outward in the radial direction from the connector.

The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a spool movable in an axial direction, the valve unit controlling a control pressure supplied to a control target by movement of the spool; a housing having a hollow portion; a solenoid coil provided in the hollow portion; a driving member provided in the hollow portion, the driving member being configured to drive the spool by applying an exciting current to the solenoid coil and thereby moving the solenoid coil in the axial direction; a connector that closes an opening of the housing; a pin provided between the connector and the housing, the pin having a pin inclined surface inclined with respect to the axial direction, the pin being movable in a radial direction orthogonal to the axial direction from a 1 st position, in which the pin is not in contact with the driving member, to a 2 nd position, in which the pin inclined surface is in contact with the driving member, the 2 nd position being located further inward in the radial direction than the 1 st position; and a cable, at least a part of which is accommodated in the connector, for applying an exciting current to the solenoid coil.

The reversing valve of the technical scheme comprises any electromagnetic proportional valve.

The construction machine according to an aspect of the present invention includes the above-described reversing valve.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, in an electromagnetic proportional valve including a manual pin for manually driving a spool, an electric cable can be led out from an axial end.

Drawings

Fig. 1 is a cross-sectional view schematically showing a section along the axial direction of a part of an electromagnetic proportional valve 1 according to an embodiment of the present invention. In fig. 1, pin 19 is in position 1, which is not in contact with plunger 16.

Fig. 2 is a cross-sectional view schematically showing a section along the axial direction of a part of the electromagnetic proportional valve 1 according to an embodiment of the present invention. In fig. 2, pin 19 is in position 2 in contact with plunger 16.

Fig. 3 is a schematic diagram showing an end face of the electromagnetic proportional valve 1 of fig. 1.

Fig. 4 is a diagram schematically showing a driving member and a pin included in an electromagnetic proportional valve according to another embodiment of the present invention.

Fig. 5 is a block diagram illustrating a reversing valve including the electromagnetic proportional valve of fig. 1.

Fig. 6 is a block diagram illustrating a construction machine including the reversing valve of fig. 5.

Description of the reference numerals

1. An electromagnetic proportional valve; 10. a driving device; 12. a connector; 13. a cable; 14. a solenoid coil; 16. 116, a plunger; 17. a driving rod; 19. 119, pins; 19a, a convex part; 19b, 119b, pin inclined surfaces; 20. a valve unit; 22. a spool; 116a, drive member inclined surface.

Detailed Description

Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. In the drawings, the same reference numerals are assigned to components commonly used in the drawings. It should be noted that for ease of illustration, the drawings are not necessarily illustrated to exact scale. In each drawing, some constituent elements may be omitted for convenience of description.

An electromagnetic proportional valve 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 3. The electromagnetic proportional valve 1 includes a driving device 10 and a valve unit 20. The drive device 10 and the valve unit 20 are arranged along the central axis a. In this specification, the direction along the central axis a is sometimes simply referred to as the "axial direction". In the present specification, the reference to the front and rear is based on the front and rear direction shown in fig. 1, except for the case where the description is otherwise made. Accordingly, the valve unit 20 is disposed in front of the driving device 10.

The electromagnetic proportional valve 1 can be maintained in any one of three states, that is, a supply position in which the hydraulic device communicates with a hydraulic source from which oil is supplied to the hydraulic device, a discharge position in which the hydraulic device communicates with a tank for storing oil, and from which oil is discharged to the tank, and a neutral position in which the hydraulic device is blocked from the hydraulic source and from the hydraulic device to the tank.

The valve unit 20 includes a hollow valve body 21 extending in the axial direction along the central axis a, and a spool 22 provided inside the valve body 21. The valve main body 21 has a pressure source port for communicating with a pressure source, a tank port for communicating with a tank, and a control port for outputting a control pressure to a hydraulic device as a control target. The illustration of the ports is omitted.

The drive device 10 applies thrust in the axial direction to the spool 22, thereby controlling the axial position of the spool 22. The driving device 10 includes: the plunger assembly includes a hollow housing 11, a connector 12, a solenoid coil 14 provided in a hollow portion of the housing 11, a plunger 16 driven by the solenoid coil 14, a cylindrical member 15 guiding the plunger 16, a driving rod 17 extending forward from a front end of the plunger 16, and a fixed iron core 18. The plunger 16 and the drive rod 17 are also provided in the hollow portion of the housing 11.

The housing 11 has a bottomed cylindrical shape extending in the direction of the central axis a. The front of the housing 11 opens toward the valve unit 20. The opening in the front of the housing 11 is sealed by the fixed iron core 18 and the other sealing members. The bottom wall 11b of the housing 11 has a through hole extending in the axial direction. The through hole is blocked by the connector 12.

The cylindrical member 15 has a bottomed cylindrical shape extending in the axial direction. The inner diameter of the cylindrical member 15 is substantially equal to the outer diameter of the large diameter portion 16a of the plunger 16. The cylindrical member 15 has a through hole 15a in a side surface thereof into which the pin 19 is inserted.

As shown in fig. 3, the connector 12 has an upper wall 12a having a substantially rectangular shape as viewed from the direction of the central axis a, a bottom wall 12b disposed axially away from the upper wall 12a, and 4 side walls 12c connecting the upper wall 12a and the bottom wall 12 b. An inner space of the connector 12 is partitioned by these upper wall 12a, bottom wall 12b, and side wall 12c. The upper wall 12a has a through hole. The side wall 12c is substantially flat. The side wall 12c has a flat planar surface. A part of the cable 13 is accommodated in the internal space of the connector 12. Although not shown, the cable 13 is electrically connected to the solenoid coil 14. The solenoid coil 14 is excited based on a control signal input from a controller, not shown, via the cable 13. The connector 12 has a through hole extending in the axial direction, and the cable 13 is led out from the through hole.

The plunger 16 and the drive rod 17 are disposed on the central axis a. Alternatively, the plunger 16 and the drive rod 17 may have a one-piece structure. The plunger 16 and the drive rod 17 are provided so as to be movable in the axial direction. The drive rod 17 extends axially forward from the plunger 16. The tip (front end) of the drive rod 17 is in contact with the base end (rear end) of the spool 22. Since the spool 22 is always biased rearward in the axial direction by a return spring (not shown), the contact between the drive rod 17 and the spool 22 can be maintained.

At least a part of the plunger 16 is formed of a magnetic material. At least a portion of the plunger 16 is disposed radially inward of the solenoid coil 14. Plunger 16 is driven by solenoid coil 14. That is, the plunger 16 is driven by the solenoid coil 14 so as to be movable in the axial direction. Specifically, an exciting current is applied to the solenoid coil 14, and the plunger 16 is attracted to the fixed iron core 18. Thereby, the plunger 16 and the drive rod 17 move forward in the axial direction, and thrust force directed forward in the axial direction acts on the spool 22. Thus, the spool 22 is driven by the plunger 16 and the drive rod 17. In the present specification, a member that drives the spool 22 by electric control is referred to as a drive member. The spool 22 is driven by the movement of the plunger 16 and the drive rod 17 in the axial direction, and thus the plunger 16 and the drive rod 17 are examples of the drive member. The drive member may also include members other than the plunger 16 and the drive rod 17. The pin 19, which will be described later, is manually moved, is not electrically driven, and is therefore not included in the driving member.

The spool 22 driven by the plunger 16 and the drive rod 17 moves toward the axial direction. When the supply of the exciting current to the solenoid coil 14 is interrupted, the spool 22 moves axially rearward together with the plunger 16 and the drive rod 17 due to the biasing force from the biasing member. In this way, by applying the exciting current to the solenoid coil 14, the position of the spool 22 in the axial direction can be changed, and thereby the electromagnetic proportional valve 1 can be switched to any one of the supply position, the discharge position, and the neutral position.

A groove 11c is provided in a part of the outer surface of the bottom wall 11b of the housing 11. The groove 11c extends radially at the outer surface of the bottom wall 11 b. A through hole 12c1 into which a pin is inserted is provided in one of the 4 side walls 12c of the connector 12. The pin 19 is provided in the groove 11c. A part of the pin 19 extends from the outer space of the housing 11 to the inner space of the housing 11 through the through hole 12c1. Thus, the pin 19 is provided between the housing 11 and the connector 12. The pin 19 has a convex portion 19a protruding radially outward from the outer surface of the side wall 12c from the viewpoint of the central axis a.

The pin 19 is movable in the radial direction along the groove 11 c. Fig. 1 shows the pin 19 in the 1 st position in the radial direction, and fig. 2 shows the pin 19 in the 2 nd position in the radial direction. The 2 nd position of the pin 19 is a position radially inward of the 1 st position. As shown in fig. 1, pin 19 is not in contact with plunger 16 in position 1. The pin 19 is provided at a position not interfering with the stroke range of the plunger 16 when it is located at the 1 st position. As shown in fig. 2, the pin 19 contacts the plunger 16 at the 2 nd position radially inward of the 1 st position. The pin 19 has a pin inclined surface 19b inclined with respect to the central axis a. The pin inclined surface 19b is a surface on the radially inner side of the pin 19. The pin inclined surface 19b connects the 1 st radial surface 19c and the 2 nd radial surface 19d, which are parallel to the radial direction and perpendicular to the axial direction, of the surfaces of the pin 19. The 1 st radial surface 19c is axially rearward of the 2 nd radial surface 19d. The pin inclined surface 19a is inclined in a direction in which the length in the radial direction of the 1 st radial surface 19c is longer than the length in the radial direction of the 2 nd radial surface 19d. The position of the pin 19 shown in fig. 2 is an example of the 2 nd position. Position 2 is where pin 19 is in contact with plunger 16. When the pin 19 is pushed from the 1 st position to the radial inner side, the pin inclined surface 19a first contacts the plunger 16 at the start contact position in the radial direction. The 2 nd position is a position radially inward of the initial contact position.

When the pin 19 contacts the tip (rear end) of the plunger 16 at the pin inclined surface 19a, the pin 19 is pushed further inward in the radial direction, and the thrust force in the axial direction can be applied from the pin 19 to the plunger 16. Therefore, even if the electrical system is defective and the plunger 16 cannot be driven by the solenoid coil 14, the plunger 16 and the driving rod 17 can be moved in the axial direction by, for example, pushing the pin 19 radially inward by an operator's operation, and as a result, the position of the spool 22 can be switched.

A driving member of another embodiment and a pin in contact with the driving member will be described with reference to fig. 4. Fig. 4 is a diagram schematically showing a driving member and a pin included in an electromagnetic proportional valve according to another embodiment of the present invention. The driving member shown in fig. 4 has a plunger 116 and a driving rod 117 extending forward from the front end of the plunger 116. The plunger 116 has a driving member inclined surface 116a at its rear end, which is complementary in shape to the pin inclined surface of the pin 119. In the illustrated embodiment, the drive member inclined surface 116a and the pin inclined surface 119a are inclined at the same angle with respect to the central axis a. The pin 119 pushed radially inward to the 2 nd position contacts the driving member inclined surface 116a of the plunger 116 at its pin inclined surface 119 a. When the pin inclined surface 119a of the pin 119 contacts the driving member inclined surface 116a of the plunger 116, the pin 119 is pushed further radially inward, and the axial thrust force can be applied from the pin 119 to the plunger 116.

Next, the operation of the electromagnetic proportional valve 1 will be described. The spool 22 is maintained in the exhaust position without the solenoid 14 being energized. From this state, when the solenoid coil 14 is excited, the plunger 16 is driven, and the plunger 16 moves axially forward together with the drive rod 17. At this time, the tip of the drive rod 17 contacts the spool 22, so that thrust force in the axial forward direction acts on the spool 22. Under the urging force, the spool 22 reaches the neutral position from the discharge position. When a larger exciting current is applied to the solenoid coil 14, the plunger 16 and the drive rod 17 move further axially forward. The spool 22 reaches a supply position by the pushing force received from the drive lever 17, and supplies a control pressure to the hydraulic device to be controlled.

If the plunger 16 cannot be driven by applying an exciting current to the solenoid coil 14 due to a failure of the electrical system or other reasons, the plunger 16 can be moved in the axial direction by an operation of pushing the pin 19 or the pin 119 radially inward by the operator, and the position of the spool 22 can be switched.

Next, an application example of the electromagnetic proportional valve 1 will be described with reference to fig. 5 and 6. Fig. 5 is a block diagram illustrating a reversing valve 100 including the electromagnetic proportional valve 1. As shown in the figure, the selector valve 100 includes a solenoid proportional valve 1 and a valve structure 2 that operates by a control pressure supplied from the solenoid proportional valve 1. The valve structure 2 includes a main spool, and the position of the main spool is switched by the control pressure output from the electromagnetic proportional valve 1 to adjust the supply amount of the hydraulic oil to a hydraulic cylinder, not shown.

Fig. 6 is a block diagram illustrating a construction machine 200 including the reversing valve 100. The work machine 200 includes a reversing valve 100. The construction machine is, for example, a hydraulic excavator that operates by hydraulic pressure. The work machine 200 includes various hydraulic cylinders. The hydraulic cylinders included in the construction machine 200 include a boom cylinder that drives a boom, an arm cylinder that drives an arm, a bucket cylinder that drives a bucket, and hydraulic cylinders other than these. The directional valve 100 controls the supply amount of hydraulic oil to a hydraulic cylinder included in the construction machine 200.

Next, the operational effects obtained by the above embodiment will be described. The electromagnetic proportional valve 1 of the above embodiment includes: a hollow housing 11 extending in the axial direction; a plunger 16 and a drive rod 17 provided in the housing 11 so as to be movable in the axial direction, for driving the spool 22; and a pin 19 having a pin inclined surface inclined with respect to the axial direction. The pin 19 is movable in the radial direction by an operator's operation from a 1 st position, where the pin 19 is not in contact with the plunger 16, to a 2 nd position, where the pin inclined surface 19b is in contact with the plunger 16, radially inward of the 1 st position. Therefore, even if the plunger cannot be electrically controlled due to a failure of the electrical system or the like, the position of the spool 22 can be switched by the operating pin 19. Since the movement direction of the pin 19 is a radial direction perpendicular to the axial direction, interference between the pin 19 and the cable 13 led out in the axial direction is easily avoided.

In the above-described embodiment, the plunger 116 has the driving member inclined surface 116a of a shape complementary to the pin inclined surface 119 a. Accordingly, since the pin 119 is in surface contact with the plunger 116, breakage of the pin 119 and the plunger 116 can be suppressed.

In the above embodiment, the side wall 12c of the connector 12 has a flat surface extending parallel to the axial direction, and the pin 19 is provided on the flat surface. Since the side surface of the housing 11 has a cylindrical shape, it is often difficult to provide the pin 19 on the side surface of the housing 11. In the above embodiment, the pin 19 is mounted on the flat surface of the side wall 12c of the connector 12, so that the mounting of the pin 19 is facilitated.

The pin 19 has a convex portion 19a protruding radially outward from the connector 12. This allows the operator to operate the pin 19 relatively easily.

The dimensions, materials, arrangements and steps of the respective constituent elements described in the present specification are not limited to those explicitly described in the embodiments, and the respective constituent elements may be modified to have any dimensions, materials, arrangements and steps that can be included in the scope of the present invention. In addition, components not explicitly described in the present specification may be added to the described embodiments, and a part of the components described in each embodiment may be omitted.

The specific shapes, arrangements, functions, and materials of the constituent members of the driving device 10 and the valve unit 30, which are explicitly shown in the present specification and the drawings, are examples. The shape, arrangement, function, and materials of the respective constituent members of the driving device 10 and the valve unit 30 can be appropriately changed within a range not departing from the gist of the present invention. For example, the movement of the pin 19 to the radial inside may not be a linear movement. For example, the pins 19, 119 may also be moved radially inward by revolving around the axis. The shape of the pins 19, 119 is not limited to the shape explicitly shown in the present specification. The pins 19 and 119 may have any shape that can apply axial thrust to the plungers 16 and 116 when the pins 19 and 119 are pushed further radially inward from the position where the pins 19 and 119 contact the plungers 16 and 116.

The driving device 10 may drive the driving rod 17 to move axially rearward when the exciting current is applied to the solenoid coil 23.

Claims

1. An electromagnetic proportional valve, comprising:

A valve unit having a spool movable in an axial direction, the valve unit controlling a control pressure supplied to a control target by movement of the spool;

a housing having a hollow portion;

a solenoid coil provided in the hollow portion;

a driving member provided in the hollow portion, the driving member being configured to drive the spool by applying an exciting current to the solenoid coil and thereby moving the solenoid coil in the axial direction; and

And a pin provided in a groove formed on an outer surface of a bottom wall of the housing so as to extend in a radial direction orthogonal to the axial direction, the pin having a pin inclined surface inclined with respect to the axial direction, the pin being movable in the radial direction from a1 st position, in which the pin is not in contact with the driving member, to a2 nd position, in which the pin inclined surface is located on an inner side in the radial direction than the 1 st position, and in which the pin inclined surface is in contact with the driving member.

2. The electromagnetic proportional valve of claim 1, wherein,

The driving member has a driving member inclined surface of a shape complementary to the pin inclined surface, and the pin inclined surface is in contact with the driving member inclined surface with the pin at the 2 nd position.

3. An electromagnetic proportional valve, comprising:

a housing having a hollow portion;

a solenoid coil provided in the hollow portion;

A pin provided in a groove formed on an outer surface of a bottom wall of the housing so as to extend in a radial direction orthogonal to the axial direction, the pin being movable in the radial direction from a 1st position, in which the pin is not in contact with the driving member, to a 2 nd position, in which the pin is in contact with the driving member, on an inner side of the 1st position in the radial direction, and in which the pin applies a thrust force in the axial direction to the driving member.

4. The electromagnetic proportional valve according to any one of claim 1 to 3, wherein,

The electromagnetic proportional valve comprises a connector that closes the opening of the bottom wall of the housing,

The pin is disposed between the connector and the housing.

5. The electromagnetic proportional valve of claim 4, wherein,

The connector has a flat face extending parallel to the axial direction,

The pin is provided on the flat surface.

6. The electromagnetic proportional valve of claim 4, wherein,

The connector receives a portion of a cable for applying an excitation current to the solenoid coil.

7. The electromagnetic proportional valve of claim 4, wherein,

8. A reversing valve comprising the electromagnetic proportional valve of any one of claims 1 to 7.

9. A construction machine comprising the directional valve of claim 8.

10. An electromagnetic proportional valve, comprising:

a housing having a hollow portion;

a solenoid coil provided in the hollow portion;

A driving member provided in the hollow portion, the driving member being configured to drive the spool by applying an exciting current to the solenoid coil and thereby moving the solenoid coil in the axial direction;

a connector that closes an opening of a bottom wall of the housing;

A pin which is located in a groove formed in an outer surface of the bottom wall of the housing so as to extend in a radial direction orthogonal to the axial direction, is provided between the connector and the housing, and has a pin inclined surface inclined with respect to the axial direction, the pin being movable in the radial direction from a1 st position, in which the pin is not in contact with the driving member, to a2 nd position, in which the pin inclined surface is located on the inner side in the radial direction than the 1 st position, and in which the pin inclined surface is in contact with the driving member; and

And a cable, at least a part of which is accommodated in the connector, for applying exciting current to the solenoid coil.