JPH0650308U - solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent contact between the contact surfaces of the mover and stator,
A solenoid having high durability and improved response can be provided by devising a new shape on the contact surface. In a solenoid including a stator 5, a coil 8 arranged so as to surround the stator 5, and a plunger 7 provided so as to be able to come into contact with and separate from the stator 5, the stator 5 and the plunger 7 are provided. Flat contact surfaces 2 that are attracted to each other
6, the projection 2 is provided on at least one of the contact surfaces.
7 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid used as an actuator such as a solenoid valve for a vehicle brake.

[0002]

[Prior art]

 A conventional solenoid of this type is, for example, one shown in FIG. That is, this solenoid is incorporated in the brake solenoid valve 100, and usually has a plunger 102 as a mover which is pressed by a spring 101, and a steel ball as a valve element via a rod 103 in the plunger 102. 104 is attached. When an electric current is applied to the coil 105, the plunger 102 is attracted to the stator 106, and at the same time, the steel ball 104 separates from the valve seat 107 and opens the oil passage 108.

Since a solenoid used for such a solenoid valve for a brake is required to have very high responsiveness, it is shown in FIG. 3 (b) as a measure for preventing the suction surfaces of the plunger 102 and the stator 106 from being stuck to each other. Such a slit 109 having a V-shaped cross section has been commonly used.

[0004]

[Problems to be solved by the device]

 However, in the above-described conventional solenoid, when a slit width effective for preventing adhesion is secured, there is a problem that the contact surface becomes small and the durability deteriorates. That is, when the durability test is performed, the stator 106, the plunger 102, and the shim 110 interposed between the suction surfaces of the stator 106 and the plunger 102 are greatly worn, and the stroke and the characteristic change significantly before and after the test. was there.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to change the shape of the contact surface to prevent contact between the contact surface of the mover and the stator. The idea is to provide a solenoid with high durability and improved responsiveness.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a stator, a coil arranged so as to surround the stator, and a mover provided so as to be able to come into contact with and separate from the stator. In the provided solenoid, a protrusion is provided on at least one of contact surfaces of the stator and the mover that are attracted to each other.

[0007]

[Action]

 In the present invention, since the protrusions are provided on the flat contact surfaces of the stator and the mover, the contact surfaces are separated from each other by the height of the protrusions so that the contact surfaces do not adhere to each other. Therefore, the responsiveness is fast.

When a current is applied to the coil, the stator is magnetized, and the magnetic attraction force attracts the mover to the stator, so that the contact surfaces of the mover and the stator collide with each other. In this collision, the projection provided on the contact surface first hits the contact surface of the mating member, and the projection and the mating portion of the mating member are elastically deformed to absorb the shock.

When the amount of elastic deformation becomes larger than the height of the protrusions, the flat contact surfaces collide with each other, but since the impact force is absorbed by the protrusions, the impact between the contact surfaces becomes small and the progress of wear is reduced. To be done.

[0010]

【Example】

 The present invention will be described below based on the illustrated embodiment.

FIG. 1 shows a solenoid valve to which a solenoid according to an embodiment of the present invention is applied. This solenoid valve is configured such that a first sleeve 1 that constitutes a valve box, a valve seat 2 that is fitted in the first sleeve 1, and a valve seat 2 that can be attached to and detached from the valve seat 2 in an axial direction. It is composed of a steel ball 3 as a valve body and a solenoid 4 for axially driving the steel ball 3.

The solenoid 4 is provided with a magnetic stator 5, a resin-molded coil assembly 6 arranged so as to surround the stator 5, and an axially attachable / detachable element with respect to the stator 5. And a plunger 7 as a mover of a magnetic body. A shim 31 is interposed between the stator 5 and the plunger 7.

The coil assembly 6 is formed by covering the coil 8 with a molding resin 9 and forming a cylindrical shape, and a lead wire 10 for energizing the coil 8 is connected to the coil assembly 6. The stator 5 is fitted and fixed to the inner circumference of the second sleeve 12, which is a magnetic second sleeve 12 coaxially connected to the first sleeve 1 via a non-magnetic connecting member 11. And a magnetic cap 13. The stator 5 projects outward from one end of the coil assembly 6, and a washer-shaped magnetic second yoke member 14 is integrally connected to the outer periphery of the second sleeve 12 of the projecting portion of the stator 5. The end surface of the coil assembly 6 is in contact with the second yoke member 14.

On the other hand, one end of the first sleeve 1 projects from the other end of the coil assembly 6, and a washer-shaped first yoke member 15 made of a magnetic material is fixed to the outer periphery of the first sleeve 1 to form a coil. It is in contact with the other end surface of the assembly 6. Therefore, the coil assembly 6 is sandwiched at both end surfaces by the first and second yoke members 15 and 14. Further, the first and second yoke members 15, 14 are connected by a third yoke member 16.

The plunger 7 is arranged between the cap 13 of the stator 5 and the valve seat 2 of the first sleeve 1, and the steel ball 3 is operatively connected to the plunger 7 via the rod 17. There is. On the other hand, the valve seat 2 and the cap 13 are coaxially mounted with the first and second bearing members 18 and 19, and support both ends of the rod 17 so as to be movable in the axial direction.

Further, both openings of the first sleeve 1 into which the valve seat 2 is fitted and the second sleeve 12 which constitutes the stator 5 serve as an inflow / outflow port for the control fluid, and the first and second bearings are provided. The members 18, 19, the plunger 7, and the cap 13 are formed with a flow path 22 that communicates the outflow ports 20, 21 at both ends, and the steel ball 3 opens and closes the flow path 22. In particular, the cap 13 forming the stator 5 is formed with a through hole 23 forming the flow path 22 and having a larger diameter than the rod 17, while the plunger 7 has the same diameter as the through hole 23. A hole 24 that also constitutes the flow path 22 is formed.

A spring 25 is interposed between the second bearing member 19 and the plunger 7 so as to urge the plunger 7 away from the cap 13, in this embodiment, the steel ball 3 is pressed against the valve seat 2. The end of the spring 25 on the plunger 7 side is locked to the bottom 24 of the hole.

As shown in FIGS. 1B and 1C, at least one of the contact surfaces 26 of the cap 13 of the stator 5 and the plunger 7 which are attracted to each other is flat. Further, the protrusion 27 is provided. In this embodiment, the protrusions 27 have an elliptical cross-sectional arcuate shape, and a plurality of them are formed radially. The optimum size is selected depending on the shape, material, etc., but it is preferable to set the height h to about 0.01 [mm] and the width a to about 0.8 [mm]. Further, the arrangement of the protrusions is not limited to the radial arrangement, and an arbitrary arrangement such as a ring can be selected.

In the present invention, since the protrusion 27 is provided on the flat contact surface 26 of the stator 5 and the plunger 7, the contact surfaces 26 are separated from each other by the height a of the protrusion 27. Does not adhere. Therefore, the responsiveness is fast.

When a current is applied to the coil 8, the stator 5 is magnetized, and the magnetic attraction force attracts the plunger 7 to the cap 13 of the stator 5, so that the contact surfaces of the plunger 7 and the cap 13 contact each other. Collide. At the time of this collision, first, the projection 27 provided on the contact surface 26 hits the contact surface of the mating member, and the projection 27 and the projection contacting portion of the mating member are elastically deformed to absorb the shock.

When the amount of elastic deformation becomes larger than the height of the protrusion 27, the flat contact surfaces collide with each other, but since the impact force is absorbed by the protrusion 27, the impact between the contact surfaces becomes small and the progress of wear progresses. Is reduced.

As one of the methods for obtaining the shape of the protrusion 27, a press die 29 having a sword 28 having a shape as shown in FIG. 1D is prepared, and the sword 28 is pushed in The swelling that can be formed on the left and right can be used as the protrusion 27. Further, the shape of the raised portion can be easily changed depending on the shape of the sword 28 and the pushing amount. In this embodiment, a slit 30 having a V-shaped cross section similar to the conventional one is formed, and projections 27 are formed on the left and right side edges of the slit 30. With this configuration, it is possible to improve durability while ensuring a slit width effective for preventing adhesion.

FIG. 2 shows the results of 10 million times of operation durability tests of the present invention and the conventional example. That is, the slit 30 is formed in the same manner as the conventional one using the press die 29, and the protrusions 27 are formed on the left and right side edges of each slit 30, and only the slit is formed by cutting. It is a comparison of the case of forming. As is clear from the graph, it was confirmed that the stroke change and the change in the depressurization characteristics of the valve before and after the test were smaller than those of the conventional shape, and the durability was excellent.

[0024]

EFFECTS OF THE INVENTION The present invention has the above-described structure and operation. By providing a protrusion on the contact surface to prevent the contact surface of the mover and the stator from sticking together, the durability is high and the response is high. It is possible to improve the sex.

[Brief description of drawings]

FIG. 1 (a) is a vertical sectional view of a solenoid valve to which a solenoid according to an embodiment of the present invention is applied, and FIG. 1 (b) is a plan view schematically showing a contact surface between a stator and a mover. Figure, same figure
(c) is a sectional view taken along the line C-C of (b) of the same figure, (d) is a plan view showing an example of a press die for forming a protrusion, (e) of the same figure.
Is a plan view of a contact surface in which a protrusion is formed using the mold of FIG. 6D, and FIG. 6F is an enlarged sectional view taken along line FF of FIG.

FIG. 2 shows the results of operation endurance tests of the present invention and the conventional example. FIG. 2 (a) is a graph showing the relationship between the number of operations and the stroke change amount, and FIG. 2 (b) is the number of operations. It is a graph which shows the relationship of pressure reduction characteristics.

FIG. 3A is a vertical sectional view of a solenoid valve to which a conventional solenoid is applied, and FIG. 3B is a partial sectional view of a contact surface in which a slit is formed.

[Explanation of symbols]

 1 First Sleeve 2 Valve Seat 3 Steel Ball 4 Solenoid 5 Stator 6 Coil Assembly 7 Plunger (Mover) 8 Coil 9 Mold Resin 10 Lead Wire 11 Connecting Member 12 Second Sleeve 13 Cap 14 Second Yoke Member 15 First Yoke Member 16 Third yoke member 17 Rod 18, 19 First and second bearing members 20, 21 Outflow inlet 22 Flow path 23 Through hole 24 Hole 25 Spring 26 Contact surface 27 Protrusion 28 Sword 29 Press die 30 Slit

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[Procedure amendment]

[Submission date] February 10, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Scope of utility model registration request] 1. A solenoid comprising a stator, a coil arranged so as to surround the stator, and a mover provided so as to come in contact with and separate from the stator, wherein the stator and the mover are provided. Of the flat contact surfaces that are attracted to each other, a projection is provided on at least one of the contact surfaces.