JP5906499B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve that opens and closes a flow path when a valve body contacts and separates from a valve seat.

  Conventionally, as a solenoid valve that opens and closes a flow path by contacting and separating the valve body from the valve seat, the plunger is driven by electromagnetic force, and the rod having the valve body is configured to reciprocate as the plunger moves. There is known one that is inserted into a guide hole of a guide and is slidably held (see, for example, Patent Document 1).

  Furthermore, in this solenoid valve, an eccentric spring that biases the plunger in a direction orthogonal to the reciprocating direction of the plunger is provided at the end of the plunger, thereby preventing vibration of the plunger and the rod, and thus generating abnormal noise. I try to prevent it.

JP 2004-116616 A

  However, since the conventional solenoid valve is newly provided with an eccentric spring to prevent vibration of the plunger and the rod, there is a problem that the configuration of the solenoid valve becomes complicated and the number of assembling steps increases.

  An object of this invention is to make it possible to prevent the vibration of a rod with a simple structure in view of the said point.

In order to achieve the above object, the invention according to claim 1 is an electromagnetic valve that opens and closes the flow path (3c) through which the fluid flows when the valve body (404) contacts and separates from the valve seat (403b). A coil (413) that forms a magnetic field when energized, a plunger (411) driven by electromagnetic force generated by energizing the coil, and a resin that has a valve body at its end and reciprocates as the plunger moves A fin having a made rod (402) and a guide (401) formed with a guide hole (401a) for slidably holding the rod and biasing the rod in a direction orthogonal to the rod reciprocating direction (402b) is integrally formed on the outer peripheral surface of the rod, and the fins are arranged apart along the reciprocating direction of the rod .

  According to this, since the movement of the rod in the direction orthogonal to the rod reciprocating direction is suppressed by the spring force of the fin, the vibration of the rod is prevented. Since the fin is formed integrally with the rod, the number of parts is reduced, the configuration of the solenoid valve is simplified, and the number of assembling steps can be reduced. Further, since the rod is made of resin, the fin can be easily formed on the rod.

According to a third aspect of the present invention, in the electromagnetic valve according to the second aspect , the fins are non-uniformly arranged along the rod circumferential direction.

According to this, since the rod is always biased in a specific direction out of the directions orthogonal to the rod reciprocating direction, the operating track of the rod having the valve body is stabilized. In particular, by the energization amount of the co-yl is adjusted, the solenoid valve differential pressure between the downstream side of the fluid pressure on the upstream side of the fluid pressure and the valve seat of the valve seat is controlled, the configuration of claim 3 Since the operating trajectory of the rod having the valve body is stabilized, the control accuracy of the opening degree (the clearance between the valve body and the valve seat) with respect to the control input (the amount of current supplied to the coil) is improved.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is front sectional drawing which shows the state by which the solenoid valve which concerns on one Embodiment of this invention was assembled | attached to the housing of the actuator. (A) is a top view of the rod in the solenoid valve of FIG. 1, (b) is a front view of (a).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, for hydraulic pressure control for controlling brake hydraulic pressure between a master cylinder (hereinafter referred to as M / C) 2 and a wheel cylinder (hereinafter referred to as W / C) 1 of a vehicle. An actuator 3 is provided. The hydraulic pressure control actuator 3 includes an aluminum alloy housing 3a. The housing 3a has a stepped cylindrical recess 3b into which the electromagnetic valve 4 is inserted, and a brake between the M / C2 and the W / C1. A flow path 3c for flowing the liquid is formed.

  The electromagnetic valve 4 includes a stepped cylindrical guide 401 made of a magnetic material. One end of the guide 401 is inserted into the recess 3b of the housing 3a, and the other end protrudes outside the housing 3a. And the guide 401 is liquid-tightly fixed to the housing 3a by caulking the opening end part of the recessed part 3b.

  In the guide 401, a guide hole 401a for slidably holding the rod 402, a sheet insertion hole 401b into which the sheet 403 is press-fitted, and a space 401c which is a part of the sheet insertion hole 401b are flown on the M / C2 side. A communication hole 401d communicating with the path 3c is formed. More specifically, the space 401c is a space defined by the guide 401, the rod 402, and the sheet 403 in the sheet insertion hole 401b.

  The rod-shaped rod 402 is made of resin and can reciprocate along the axial direction of the guide hole 401a. A portion of the rod 402 on the seat 403 side protrudes from the guide hole 401a and extends into the space 401c, and a spherical main valve body 404 is integrally formed at the tip thereof. A portion 402a of the rod 402 that slides while being held in the guide hole 401a (hereinafter referred to as a rod sliding portion 402a) has a substantially cross shape in plan view.

  Fins 402b are integrally formed on the outer peripheral surface of the rod sliding portion 402a. The fin 402b has a thin plate shape elongated in the rod reciprocating direction, and one end side is connected to the rod sliding portion 402a to be a fixed end, and the other end side is a free end. Further, the fin 402b can be elastically deformed so that the free end side moves in a direction orthogonal to the rod reciprocating direction (that is, the rod radial direction) with the fixed end as a base point, and this elastic deformation generates a spring force. To do. The free end of the fin 402b abuts on the guide hole 401a, and the rod 402 is urged in a direction orthogonal to the rod reciprocating direction.

  The fins 402b are arranged at equal intervals along the rod circumferential direction. Further, the fins 402b are arranged away along the rod reciprocating direction. More specifically, four fins 402b are arranged on one end side in the rod reciprocating direction and four fins 402b are arranged on the other end side in the rod reciprocating direction.

  The metal cylindrical sheet 403 is formed with a main flow path 403a communicating with the space 401c in the guide 401 and the flow path 3c on the W / C1 side at the center in the radial direction. A tapered main valve seat 403b with which the main valve body 404 contacts and separates is formed at the end of the main flow path 403a on the space 401c side, and an orifice having a smaller passage area than the main flow path 403a is formed in the main flow path 403a. 403c is formed. The main valve body 404 is brought into and out of contact with the main valve seat 403b, so that the space 401c in the guide 401 (or the communication hole 401d of the guide 401 or the flow path 3c on the M / C2 side) and the main flow path 403a are separated. Open and close. In addition, the discharge port of the pump 6 is connected to the flow path 3c on the W / C1 side between the recess 3b and W / C1.

  Further, a sub-flow path 403d that connects the space 401c in the guide 401 and the flow path 3c on the W / C1 side is formed in parallel with the main flow path 403a at a position shifted from the radial center of the sheet 403. ing. In other words, the sub flow path 403d bypasses the main flow path 403a and is connected to the W / C1 side flow path 3c and the M / C2 side flow path 3c.

  A tapered secondary valve seat 403e is formed in the middle of the secondary flow path 403d. In the sub flow path 403d, a metal spherical sub valve body 405 is movably inserted on the side closer to the flow path 3c on the W / C1 side than the sub valve seat 403e. The sub-valve body 405 opens and closes between the sub-channel 403d and the W / C1-side channel 3c by moving due to the pressure difference and coming into contact with and separating from the sub-valve seat 403e.

  Further, a sheet portion spring receiving surface 403f that receives one end of a spring 412 described later is formed at the end of the seat 403 on the space 401c side so as to surround the main flow path 403a.

  A filter 407 for preventing foreign matter inflow is inserted on the opening end side of the sheet insertion hole 401 b in the guide 401. The filter 407 is held by a filter fixing ring 409 that is press-fitted into the sheet insertion hole 401b. The position of the auxiliary valve body 405 when the valve is opened is determined by the filter 407. Further, a foreign substance inflow prevention filter 408 is also disposed on the outer periphery of the guide 401 so as to surround the communication hole 401d.

  A sleeve 410 is fitted on the outer peripheral side of the other end of the guide 401. The sleeve 410 is formed of a non-magnetic metal (for example, stainless steel) and has a bottomed cylindrical shape with one end opened. Has a substantially spherical shape.

  A substantially cylindrical plunger 411 made of a magnetic metal is disposed in a space defined by the sleeve 410 and the guide 401 (hereinafter referred to as a sleeve inner space), and the plunger 411 can slide in the sleeve 410. It has become. In addition, when the plunger 411 contacts the bottom surface of the sleeve 410, the upward movement of the plunger 411 is restricted.

  A plunger groove 411 a that extends continuously from one end to the other end of the plunger 411 is formed on the outer peripheral surface of the plunger 411. The space on the bottom surface side of the sleeve 410 in the inner space of the sleeve and the space between the opposing surfaces of the plunger 411 and the guide 401 in the inner space of the sleeve are communicated with each other by the plunger groove 411a.

  A spool 414 around which a coil 413 that forms a magnetic field when energized is wound is disposed around the sleeve 410. A yoke 415 forming a magnetic path member is disposed on the outer periphery of the spool 414. The plunger 411 is driven by electromagnetic force generated by energization of the coil 413 from the ECU (electronic control unit) 5. The ECU 5 controls the energization state of the coil 413 so as to execute ABS control or the like based on the motion state of the vehicle.

  The rod 402 is urged toward the plunger 411 by the spring 412 sandwiched between the rod 402 and the seat 403, and the rod 402 and the plunger 411 are always in contact with each other so as to operate integrally.

  The spring 412 is a compression coil spring, and urges the plunger 411 and the rod 402 in a direction in which the main valve body 404 moves away from the main valve seat 403b, that is, in a valve opening direction. The plunger 411 and the rod 402 are urged in a direction in which the main valve body 404 approaches the main valve seat 403b, that is, in a valve closing direction, by an electromagnetic force generated by energizing the coil 413.

  The main flow path 403 a communicates with an inner space located inside the spring 412 in the space 401 c in the guide 401. The communication hole 401 d communicates with an outer space located outside the spring 412 in the space 401 c in the guide 401.

  Next, the basic operation of the solenoid valve 4 having the above configuration will be described. Normally, the solenoid valve 4 is not energized from the ECU 5 to the coil 413, that is, is not energized. When not energized, the rod 402 and the plunger 411 are moved toward the bottom surface of the sleeve 410 by the spring 412. The plunger 411 is in contact with the bottom surface of the sleeve 410. Then, the main valve body 404 of the rod 402 is separated from the main valve seat 403b of the seat 403, and the main flow path 403a of the seat 403 is interposed between the W / C1 side flow path 3c and the M / C2 side flow path 3c. A communication state is established through the space 401 c in the guide 401 and the communication hole 401 d of the guide 401.

  When the pump 6 operates in this state, the sub valve body 405 is moved toward the sub valve seat 403e side of the seat 403 due to the pressure difference between the W / C1 side and the M / C2 side, and the sub valve body 405 is moved to the sub valve seat. The auxiliary flow path 403d of the sheet 403 is closed in contact with 403e. Therefore, when the pump 6 is operated, the brake fluid flows from the W / C1 side to the M / C2 side only through the main channel 403a of the main channel 403a and the sub channel 403d of the seat 403.

  When the operation of the pump 6 is stopped, the auxiliary valve body 405 moves due to the pressure difference between the W / C1 side and the M / C2 side, and is separated from the auxiliary valve seat 403e of the seat 403. The flow path 3c on the / C1 side and the flow path 3c on the M / C2 side are in communication with each other via the sub-flow path 403d of the sheet 403, the space 401c in the guide 401, and the communication hole 401d of the guide 401. Further, when the pressure on the M / C2 side becomes higher than the pressure on the W / C1 side while the pump 6 is operating, the W / C1 side from the M / C2 side via the secondary flow path 403d of the seat 403 Brake fluid is supplied to

  When W / C1 pressure increase due to the operation of the pump 6 is necessary, the ECU 5 operates the pump 6 and energizes the coil 413 to close the main flow path 403a. As a result, the W / C pressure increases. Then, the amount of differential pressure generated between the upstream and downstream of the electromagnetic valve 4 is linearly adjusted according to the energization amount to the coil 413. As a result, the W / C pressure is controlled in accordance with the energization amount to the coil 413.

  In the present embodiment, the rod 402 tries to vibrate in a direction orthogonal to the rod reciprocating direction due to the fluid force when the brake fluid flows, but the spring force of the fin 402b causes the rod 402 to vibrate in the rod reciprocating direction. Since the movement of the rod 402 in the orthogonal direction is suppressed, the vibration of the rod 402 is prevented.

  Further, since the fin 402b is formed integrally with the rod 402, the number of parts is reduced, the configuration of the solenoid valve 4 is simplified, and the number of assembling steps can be reduced. Furthermore, since the rod 402 is made of resin, the fin 402b can be easily formed on the rod 402.

(Other embodiments)
In the said embodiment, although the fin 402b was arrange | positioned at equal intervals along the rod circumferential direction, you may arrange | position the fin 402b non-uniformly along the rod circumferential direction. In this way, since the rod 402 is always urged in a specific direction out of the directions orthogonal to the rod reciprocating direction, the operating trajectory of the rod 402 having the main valve body 404 is stabilized, and the control input ( The control accuracy of the opening degree (the gap between the main valve body 404 and the main valve seat 403b) with respect to the energization amount to the coil 413 is improved.

  In the above embodiment, four fins 402b are arranged on one end side in the rod reciprocating direction and four fins 402b are arranged on the other end side in the rod reciprocating direction. The one end side and the other end side may be different or may be singular.

  Furthermore, in the said embodiment, although the example which applies the solenoid valve 4 to the system which generate | occur | produces a differential pressure | voltage in brake fluid between W / C1 and M / C2 was shown, the solenoid valve 4 of this invention is another system. It can also be applied to.

  Furthermore, not only the solenoid valve that linearly adjusts the differential pressure between the upstream and downstream sides of the electromagnetic valve 4 by controlling the energization to the coil 413, but simply between the upstream and downstream sides of the electromagnetic valve 4 by the intermittent connection of the coil 413. The present invention can also be applied to an electromagnetic valve that opens and closes.

3c flow path 401 guide 402 rod 404 valve body 411 plunger 413 coil 401a guide hole 402b fin 403b valve seat

Claims (3)

An electromagnetic valve that opens and closes the flow path (3c) through which the fluid flows when the valve body (404) contacts and separates from the valve seat (403b),
A coil (413) that forms a magnetic field when energized;
A plunger (411) driven by electromagnetic force generated by energization of the coil;
A resin rod (402) having the valve body at the end and reciprocating as the plunger moves;
A guide (401) formed with a guide hole (401a) for slidably holding the rod;
Fins (402b) for urging the rod in a direction orthogonal to the rod reciprocating direction are integrally formed on the outer peripheral surface of the rod,
The fins, solenoid valve electrostatic you characterized by being spaced apart along the rod reciprocating direction. The solenoid valve according to claim 1 , wherein a plurality of the fins are arranged along a rod circumferential direction. The electromagnetic valve according to claim 2 , wherein the fins are non-uniformly arranged along a rod circumferential direction.

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