JP2017150586A - solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which performs suppression of self-excited vibration with a simple structure, and which has improved alignment accuracy/controllability.SOLUTION: A solenoid valve is formed by: a plunger sucked and driven by an excited coil; a valve body disposed in series in the axial direction with the plunger and in a radially movable manner; a seat part having a valve seat which the valve body comes into contact with/is separated from; an inflow hole located on the upstream side of the valve seat; a valve chamber which is provided on the downstream side of the valve seat and in which the valve body and the valve seat are arranged; an outflow hole located on the downstream side of the valve chamber; a guide part for partitioning a first space in which the valve chamber and the valve seat are disposed and a second space in which the plunger is disposed, and for restricting the movement of the valve body in the radial direction; and a through-hole for communicating the first space and the second space.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electromagnetic valve, and more particularly to an electromagnetic valve used in a hydraulic circuit such as a vehicle brake device.

  The electromagnetic valve used for this kind of vehicle brake device is described in the following patent documents, for example.

JP2008-121721

  Conventionally, a plunger having one end functioning as a valve body and a housing (seat portion) provided with a valve seat on which one end of the plunger is seated are provided, and the valve body is seated on the valve seat. The flow of hydraulic fluid from the hydraulic fluid passage on the high pressure side to the hydraulic fluid passage on the low pressure side is prohibited, and from the hydraulic fluid passage on the high pressure side to the hydraulic fluid passage on the low pressure side when the valve body is separated from the valve seat An electromagnetic valve used in a vehicle brake device that allows the flow of hydraulic fluid is known.

  The above-described electromagnetic valve is generally required to suppress the self-excited vibration of the valve body caused by the operation of the brake pedal. In particular, immediately after the solenoid valve has allowed the flow of hydraulic fluid, the valve body receives a fluid force due to a change in the flow of hydraulic fluid, and the fluid force is unbalanced between the upstream side and the downstream side. Self-excited vibration is generated in the plunger.

  The electromagnetic valve described in the above-mentioned patent document has a valve chamber in which a valve seat, a valve body, and a plunger are accommodated, and a lip of an elastic body is disposed on a valve body provided integrally with the plunger. A damper chamber is provided in the valve chamber by a plunger and a lip, and a throttle channel is formed by a gap between the lip and the valve chamber to provide resistance to the movement of the plunger, and self-excited vibration is generated by the damper chamber. It has a structure to suppress. When the self-excited vibration is induced, the lip opens along with the vibration and comes into contact with the wall surface of the damper chamber, thereby confining the hydraulic fluid in the damper chamber and enhancing the damping effect. However, the sliding resistance of the valve body changes by providing the damper chamber as described above. In particular, when self-excited vibration is induced, the lip opens and the movement of the plunger is greatly suppressed, so that fine control in accordance with the sliding resistance may be difficult.

  Furthermore, since the plunger and the valve body are integrally formed, it is necessary to align the plunger and the valve chamber and align the valve seat and the valve body with high accuracy.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic valve that suppresses self-excited vibration with a simple configuration and improves alignment accuracy / controllability.

  A hydraulic braking device according to an embodiment of the present invention includes a plunger that is driven to be attracted by an excited coil, a valve body that is arranged in series in an axial direction and radially movable with the plunger, and a valve that contacts and separates the valve body A seat portion having a seat, an inflow hole located on the upstream side of the valve seat, a valve chamber provided on the downstream side of the valve seat in which the valve body and the valve seat are disposed, and located on the downstream side of the valve chamber A guide portion for partitioning the valve chamber into a first space in which the valve seat is disposed, and a second space in which the plunger is disposed, and restricting the radial movement of the valve body; It is formed by the through-hole which connects 1 space and 2nd space.

It is sectional drawing which shows 1st Embodiment of this invention. It is sectional drawing which shows 2nd Embodiment of this invention. It is sectional drawing which shows 3rd Embodiment of this invention.

  Hereinafter, the present invention will be described in detail by way of embodiments, but the present invention is not limited by the following embodiments unless it exceeds the gist of the present invention.

(First embodiment)
As shown in FIG. 1, the electromagnetic valve 1 of the present embodiment is mounted on a housing 2 of a hydraulic unit in an ABS actuator, for example, and a brake fluid conduit (an inflow hole A1 and a discharge hole A2) formed in the housing 2. Is used as a brake fluid pressure control valve that opens and closes according to the energization state of the coil.

  The electromagnetic valve 1 includes a holding portion 3 formed in a cylindrical shape with a magnetic metal, and a portion of the holding portion 3 is fitted into a fitting portion 2a of a housing 2 of an ABS actuator. . Then, the holding portion 3 is fixed to the housing 2 by caulking the vicinity of the opening end of the fitting portion 2 a so that a part of the housing 2 enters the recess of the holding portion 3.

  A sheet 4 formed in a cylindrical shape with a metal is fixed to one end side of the holding unit 3, and a thin cylindrical sleeve 5 made of a nonmagnetic metal is fixed to the other end side of the holding unit 3. Yes. A bottomed cylindrical stopper 6 made of a magnetic metal is fixed to the sleeve 5, and one end of the first space S <b> 1 inside the sleeve 5 is closed by the stopper 6.

  In the first space S <b> 1, a plunger 7 formed in a columnar shape with a magnetic metal is disposed, and this plunger 7 is slidably held by the sleeve 5. The plunger 7 has a recess 7a in which a part of one end surface (sheet 4 side end surface) is recessed in the direction of the stopper 6, and the plunger 7 is attached to the other end surface (stopper side end surface) toward the sheet 4. A spring 10 is provided.

  The sheet 4 has a cylindrical tubular portion 4d whose opening end on the stopper 6 side extends in the axial direction, and a through hole 4c is formed in the wall surface of the tubular portion 4d. An annular guide portion 9 is press-fitted into the opening end of the cylindrical portion 4 d, and one end of the second space S <b> 2 inside the sheet 4 is closed by the guide portion 9. Further, a tapered valve seat 4b is formed at the end of the communication hole 4a of the seat 4 on the second space S2 side so that a seal portion 8a of a valve body 8 to be described later contacts and separates. Further, the guide portion 9 has a fixing portion 9 a that is press-fitted and fixed to the inner peripheral side wall surface of the seat 4, and a flange portion 9 b that is locked to the opening end, and the sliding portion 8 c of the valve body 8 is provided. Holds slidably. It is desirable that the sliding portion 8c maintain a clearance that can slide with respect to the guide portion 9.

  The first space S1 communicates with the discharge hole A2 via the discharge side communication hole 3a formed on the side surface of the holding portion 3, and the second space S2 via the through hole 4c provided in the cylindrical portion 4d. It communicates with the space S2. The second space S2 communicates with the inflow hole A1 through an inflow side communication hole 4a provided in the seat 4.

  The valve body 8 includes a seal portion 8a that seals inflowing fluid by sitting on the valve seat 4b, a pedestal portion 8b that is loosely fitted in the concave portion 7a of the plunger 7 so as to be movable in the radial direction, and a seal portion 8a and a pedestal. It has a sliding portion 8c that is connected to the portion 8b and is slidably held by the guide portion 9.

  A coil 11 that forms a magnetic field when energized is disposed on the outer peripheral side of the sleeve 5 and the stopper 6. A terminal (not shown) is drawn out from the coil 11, and the coil 11 can be energized from the outside through this terminal.

  As shown in FIG. 1, the electromagnetic valve 1 having the above configuration is biased toward the seat 4 by the elastic force of the spring 10 when the coil 11 is not energized. The valve seat 4b is seated, and the pipe line (inflow hole A1, discharge hole A2) is closed.

  On the other hand, when the coil 11 is energized, the coil 11 forms a magnetic field, and a magnetic path is formed by the stopper 6, the plunger 7, and the like. Then, the plunger 7 is attracted to the stopper 6 side by the magnetic attraction force, and the plunger 7 moves against the spring 10. As the plunger 7 moves, the valve body 8 is separated by the fluid force of the fluid flowing in from the valve seat 4b of the seat 4, and the conduits (inflow holes A1, discharge holes A2) are connected to the communication holes 3a, 4a, And it will be in a communication state via the through-hole 4c.

  According to the electromagnetic valve 1 shown in the above configuration, the alignment of the valve body 8 is achieved by the guide portion 9 and the alignment of the plunger 7 is achieved by the sleeve 5. Since the valve body 8 and the plunger 7 are configured as separate members, and the valve body 8 is disposed so as to be movable in the radial direction with respect to the plunger 7, the two members may be aligned individually. Even when the axial centers of the valve body 8 and the plunger 7 are deviated, the pedestal portion 8b is loosely fitted to the recess 7a, so that the deviation can be allowed.

  Moreover, the cylindrical part 4d is integrally and continuously extended from the valve seat 4b of the seat 4 in parallel with the valve body 8, so that the valve seat 4b and the valve body 8 are easily coaxial. Furthermore, the variation in the clearance between the valve seat 4b and the valve body 8 can be reduced.

  Further, by providing only one through hole 4c on the wall surface of the cylindrical portion 4d as shown in FIG. 1, the fluid force from the communication hole 4a to the through hole 4c in the second space S2 is limited to only one direction. Can do. As a result, since the valve body 8 is pressed in the direction opposite to the fluid force, the sliding portion 8c can always press the guide portion 9 in one direction, and the stability of the valve body 8 is improved. .

  According to the electromagnetic valve 1 having the above-described configuration, the valve element 8 is slidably supported by the guide portion 9 and its sliding resistance is negligible, so that fine control can be achieved. .

  A second embodiment of the present invention will be described. FIG. 2 is a cross-sectional view showing the overall configuration of the electromagnetic valve according to the second embodiment. The same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  According to the electromagnetic valve 1 shown in FIG. 2, a plurality of through holes 4c may be used on the side wall surface of the cylindrical portion 4d. Further, the through hole 4c may be formed by providing a notch or a groove on the contact / sliding surface between the guide portion 9 and the valve body 8. By forming the through-hole 4c with a notch or a groove, the through-hole 4c can be formed simply by press-fitting the guide portion 9, thereby reducing the step of opening the through-hole in the side wall surface of the cylindrical portion 4d. Can do. The through hole may be provided so as to penetrate the inside of the guide portion 9.

  A third embodiment of the present invention will be described. FIG. 3 is a cross-sectional view showing the overall configuration of the electromagnetic valve according to the third embodiment. The same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  According to the electromagnetic valve 1 shown in FIG. 3, the end surface on the seat 4 side of the plunger 7 has a flat surface shape without unevenness, and the pedestal portion 8b is in contact with the end surface so as to be movable in the radial direction. The guide portion 9 has an annular shape that is held in the axial direction by a tapered wall surface provided in the holding portion 3, and the through hole 4 c is formed on the annular surface of the guide portion 9. . Further, the through hole 4 may be an orifice having a throttling function.

  The guide portion 9 is a partition that separates the first space S1 that communicates with the inflow hole A1 and the discharge hole A2 and the second space S2 in which the plunger 7 is disposed, and suppresses the influence of fluid force on the plunger 7. can do.

  In the embodiment, the holding portion is made of a magnetic metal, but may be made of a nonmagnetic material such as a resin. In addition, as long as the guide portion is fixed to the holding portion or the cylindrical portion so as to be restricted from moving in the axial direction, fixing means such as press fitting, caulking, fitting, welding, and screwing may be used. .

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. In addition, the specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, etc. are appropriately changed. Can be implemented. In addition, the configuration can be partially exchanged between a plurality of embodiments.

DESCRIPTION OF SYMBOLS 1: Solenoid valve, 2: Housing, 3: Holding part, 4: Seat, 4d: Through-hole, 5: Sleeve, 6: Stopper, 7: Plunger, 8: Valve body, 9: Guide part, A1: Inflow hole, A2: Outflow hole, S1: First space, S2: Second space,

Claims (5)

A plunger driven by suction by an excited coil;
A valve body arranged in series with the plunger in the axial direction and radially movable;
A seat portion having a valve seat to which the valve body comes into contact with and away from,
An inflow hole located upstream of the valve seat;
A valve chamber provided on the downstream side of the valve seat and in which the valve body and the valve seat are disposed;
An outflow hole located downstream of the valve chamber;
A guide section that divides the valve chamber into a first space in which the valve seat is disposed and a second space in which the plunger is disposed, and restricts the radial movement of the valve body;
An electromagnetic valve comprising: the first space; and a through hole that communicates the second space.
The plunger is
The solenoid valve according to claim 1, wherein the valve body has a concave recess in which an end of the valve body is loosely fitted.
The seat portion is
Having a cylindrical tubular portion extending in the axial direction so as to surround at least a part of the valve body;
The solenoid valve according to claim 1, wherein the guide portion is disposed in the cylindrical portion.
The guide portion is
A flange portion locked to the opening end of the cylindrical portion;
A fixing portion fixed to the inner peripheral side wall surface of the cylindrical portion,
The first space is
It is divided by the inner peripheral side wall surface of the cylindrical portion, the seat surface, and the guide portion,
The second space is
The solenoid valve according to claim 3, wherein the plunger is disposed.
The through hole is
The solenoid valve according to claim 4, wherein the solenoid valve is formed on the wall surface of the cylindrical portion.