KR100423644B1 - Solenoid valve for brake system - Google Patents

Abstract

The present invention relates to a solenoid valve for a brake system in which the flow path is opened and closed in two stages so that the valve can be easily opened and closed even when a large braking pressure is applied to the inlet of the valve. To this end, the present invention provides a hollow valve housing formed with an inlet through which a fluid is introduced and a fluid outlet at one end thereof, a hollow sleeve coupled to the other end of the valve housing, and a magnetic valve core coupled to the other end of the sleeve, within the sleeve. Armature is installed between the valve core and the armature to move forward and backward and to move the armature with a small diameter part into the valve housing, the female coil installed on the outside of the sleeve to advance the armature, and the armature toward the valve housing. Restoration springs and armatures are installed in the valve housing so that the outlets can be opened and closed in two stages sequentially. One end of the channel formed in the center opens and closes with the small diameter part of the armature, and the end is in contact with the outlets. One end is inserted into the outer surface of the spool The hollow support member is fixed and the other end is slidably fitted to the outer surface of the small diameter portion of the amateur and a spool restoring spring installed on the outside of the support member so as to elastically support the support member formed with a flow path therethrough.

Description

Solenoid Valve for Brake System {SOLENOID VALVE FOR BRAKE SYSTEM}

The present invention relates to a solenoid valve for a brake system of a vehicle, and more particularly, a solenoid for a brake system in which a flow path is opened and closed in two stages so that the valve can be easily opened and closed even when a large braking pressure is applied to the inlet of the valve. It is about a valve.

In general, a vehicle anti-lock brake system is installed in the middle of a hydraulic line connected from a master cylinder to a wheel cylinder on a wheel side or a hydraulic line returning from a wheel side, so that a plurality of solenoid valves are formed by intermittent braking pressure by opening and closing a flow path. It is provided. Among these solenoid valves, there is a solenoid valve having a two-stage opening and closing means for opening and closing the valve in two stages so that the valve can be easily opened and closed even when a large braking pressure is applied to the inlet of the valve.

Referring to FIG. 1, the conventional two-stage solenoid valve is fixed to the receiving groove 2 formed in the modulator block 1 in a state in which a cylindrical sleeve 3 enters the inside, and is provided at an inner lower end of the sleeve 3. The valve seat 4 in which the outlet 4a which penetrated in the center was formed is press-fitted. In addition, an armature 5 for opening and closing the outlet 4a of the valve seat 4 is provided inside the sleeve 3 and moves toward and away from the valve seat 4, and a sleeve extending outward of the receiving groove 2 ( At the other end of 3), a magnetic valve core 6 is coupled. In addition, a return spring 7 for elastically supporting the armature 5 toward the valve seat 4 is provided between the armature 5 and the valve core 6, and is provided on the outer surface of the sleeve 3 and the valve core 6. An excitation coil 8 for moving the armature 5 forward and backward to open and close the valve is provided.

In addition, a reinforcing flange 9 is installed on the outer surface of the sleeve 3 so that the sleeve 3 can be fixed to the receiving groove 2 of the modulator block 1. In addition, a filter member 10 for filtering foreign matters of oil introduced into the inlet 1a and a sealing member 11 for airtightness are installed at the outer circumference of the sleeve 3 entered into the receiving groove 2. have.

On the other hand, at the lower end of the amateur (5) provided in the sleeve (3) is provided with a two-stage opening and closing device (12) for opening and closing the flow path of the valve seat (4) in two stages at the time of operation of the amateur (5). To this end, a small diameter portion 5a formed with a diameter smaller than the inner diameter of the sleeve 3 is provided at the lower end of the armature 5 adjacent to the valve seat 4, and the lower diameter portion 5a is provided for opening and closing of the flow path. The opening and closing ball 5b is provided. In addition, between the opening and closing ball 5b of the armature 5 and the upper end of the valve seat 4 is provided with a spool 14 for opening and closing the flow path of the valve seat 4 while lifting in accordance with the operation of the armature 5. . The spool 14 has a flow path 14a communicating with the inlet port 4a of the valve seat 4 at the center thereof. The upper part of the flow path 14a has a small diameter to open and close the ball ( 5b) is opened and closed, the lower outer diameter is configured to open and close the outlet 4a of the valve seat 4 in contact with the inlet of the valve seat (4). In addition, a cylindrical support member 13 for supporting the spool 14 is coupled to the circumference of the spool 14. A lower end of the support member 13 is provided with a jaw portion 13a for supporting the spool, and a support member. The upper end of the 13 is fixed to the outer surface of the small diameter portion 5a of the amateur 5. In addition, the spool 14 supported by the support member 13 has a stepped step of increasing its outer diameter toward the upper portion so as to be caught by the jaw portion 13a, and between the step portion 14b of the spool and the jaw portion 13a. Restoration spring 15 is interposed to have a restoring force to move the spool 14 toward the opening and closing ball (5b). Reference numerals 3a and 13a are through holes formed in the sleeve 3 and the support member 13 so that the fluid flows.

Since the conventional solenoid valve configured as described above maintains the state in which the armature 5 is advanced toward the valve seat 4 by the elasticity of the restoring spring 7, the outlet of the valve seat 4 through the lower end of the spool 14. 4a is closed and the flow path 14a of the upper part of the spool 14 is closed through the opening-and-closing ball 5b. When power is applied to the excitation coil 8 in this state, the flow path is opened while the amateur 5 is moved toward the valve core 6 by the magnetic force generated between the amateur 5 and the valve core 6. At this time, since the pressure acting on the spool 14 is large when a high braking pressure is applied to the inlet port 1a of the valve, the armature 5 and the support member are raised before the spool 14 is raised. As the 13 is raised together and the opening and closing ball 5b is spaced apart from the upper portion of the spool 14, the flow passage 14a of the upper portion of the spool 14 is opened first. In this case, the spool restoring spring 15 is compressed.

When the fluid flowing into the upper portion of the spool 14 is supplied toward the outlet port 4a of the valve seat 4 and the pressure difference between the inlet port 1a side and the outlet port 4a side is reduced, the spool 14 spring is restored. The flow path of the upper part of the valve seat 4 opens as it is raised secondary by the elasticity of (15), and it becomes a fully open state of a valve flow path. At this time, the gap s between the stepped portion 14b of the outer surface of the spool 14 and the support member jaw 13a is smaller than the gap h between the upper end of the armature 5 and the valve core 6 and the armature 5 Is raised so that the spool 14 is caught by the jaw portion 13a of the support member when it is raised.

By the way, the conventional solenoid valve having such a configuration is coupled to the small diameter portion (5a) of the armature (5) of the armature (5) when the support member 13 is coupled to the spool 14 and the spool restoring spring (15), the armature (5) ) Is a structure that must be coupled to the inside of the sleeve 3, there is a complicated problem in the assembly of the valve. In the process of joining the support member 13, the gap s between the stepped portion 14b of the spool 14 and the jaw portion 13a of the support member is a gap between the armature 5 and the valve core 6. It was difficult to manufacture the valve because it should be smaller than h).

In addition, the conventional solenoid valve has a problem that the opening speed of the valve is lowered because the spool 14 is raised until the pressure at the inlet 1a side and the outlet 4a side is almost equal to each other.

The present invention is to solve such problems, the object of the present invention is to improve the structure of the two-stage opening and closing device inside the valve to facilitate the manufacture and assembly of the valve, as well as to quickly increase the spool to open the flow path It is to provide a solenoid valve for a brake system to increase the speed.

1 is a cross-sectional view showing the configuration of a conventional solenoid valve.

2 is a cross-sectional view showing the configuration of a solenoid valve according to the present invention.

3 and 4 is a detailed view showing a sequential opening and closing operation of the solenoid valve flow path according to the present invention.

5 is a cross-sectional view showing another embodiment of the solenoid valve according to the present invention.

Explanation of symbols on the main parts of the drawings

20: modulator block, 21: valve receiving groove,

30: solenoid valve, 31: valve housing,

31a: inlet, 31b: outlet,

32: sleeve, 33: valve core,

34: amateur, 35: female coil assembly,

36: restoring spring, 41: spool,

42: support member, 43: spool restoring spring.

A solenoid valve for a brake system according to the present invention for achieving the above object, the hollow valve housing is formed with an inlet for the fluid inlet is formed around the outlet, the other end of the valve housing located opposite the outlet A hollow sleeve coupled to the magnetic valve core coupled to the other end of the sleeve positioned opposite to the valve housing, installed in the sleeve so that the small diameter portion having a small diameter enters the valve housing in a predetermined length, Excitation coil installed on the outside of the sleeve and the valve core to retract the armature, restoring spring installed between the valve core and the armature to advance the armature toward the valve housing when the power is not applied to the excitation coil When the operation of the amateur A spool is installed in the valve housing so that the outlet can be sequentially opened and closed in two stages, and one end of the flow path formed in the center is opened and closed in contact with the small diameter portion of the amateur, and the end is in contact with the outlet, and the spool supports the spool. A hollow support member having one end fixed to the outer surface of the spool and the other end slidably fitted to the outer surface of the small diameter portion of the armature, the support member being elastically supporting the support member toward the armature with a fluid flow path formed therein; It characterized in that it comprises a spool restoring spring installed on the outside of the member.

In addition, the end of the support member fitted to the armature is characterized in that the flange portion extending outward for the support of the spool restoring spring is provided.

In addition, the difference between the outer diameter of the small diameter portion of the amateur and the inner diameter of the support member is 0.04 ~ 0.06mm so that the support member can be pulled by the viscosity of the fluid during the operation of the amateur.

In addition, a friction ring fixed to one side is provided between the outer surface of the amateur and the inner surface of the support member so that the support member can be pulled by friction during operation of the amateur.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail.

The solenoid valve for the brake system according to the present invention is installed to enter the valve receiving groove 21 of the modulator block 20, the plurality of flow paths (20a, 20b) formed therein, as shown in Figure 2, the solenoid valve Inlet 31a and outlet 31b of 30 communicate with flow paths 20a and 20b in modulator block 20, respectively. The solenoid valve 30 is provided with a hollow valve housing 31 formed with an inlet 31a through which a fluid is introduced and an outlet 31b formed at one end thereof, and the valve housing 31 is a valve receiving groove. It enters in 21 and is installed.

A hollow sleeve 32 provided in a cylindrical shape is coupled to the other side of the valve housing 31, that is, the upper portion of the valve housing 31 in the drawing. At this time, the sleeve 32 is formed of a small diameter of the upper portion and a large diameter of the lower portion is formed, the lower portion having a large diameter is fitted to cover the upper outer surface of the valve housing 31 is coupled. In addition, the upper inner diameter of the sleeve 32 having a smaller diameter is generally configured to have a size similar to the inner diameter of the hollow part 31c of the valve housing 31, and is provided at the other end of the sleeve 32 opposite to the valve housing 31. The magnetic valve core 33 is fixed. That is, the sleeve 32 is closed by coupling the valve core 33 to the upper portion.

In addition, a cylindrical armature 34 capable of moving up and down is provided in the sleeve 32 so as to open and close the flow path of the valve housing 31. The armature 34 is slidably supported on the inner surface of the sleeve 32 by an upper portion, and extends into the hollow portion 31c of the valve housing 31 by being made of a small diameter portion 34a having a lower portion smaller than the diameter of the upper portion. . And the opening and closing ball 34b for opening and closing the flow path is coupled to the lower end of the small diameter portion (34a).

In addition, on the outer surface of the sleeve 32 and the valve core 33, an excitation coil assembly 35 for advancing and retracting the armature 34 in the sleeve 32 is provided. The excitation coil assembly 35 is coupled to surround the upper and outer surfaces of the bobbin 35b having the excitation coil 35a wound on the outer surface, and the coil case 35c protecting the excitation coil 35a. And a ring-shaped flux ring 35d coupled to the lower portion of the coil case 35c. At this time, the flux ring 35d plays a role of not only allowing the magnetic flux to flow toward the armature 34 when power is applied to the excitation coil 35a, but is also fitted to the outer surface of the sleeve 32 so that the stepped portion 32a of the sleeve 32 is formed. ) And the circumference is press-fit to the modulator block 20 while supporting the sleeve 32, thereby serving to fix the sleeve 32 to the modulator block 20.

In addition, between the upper portion of the armature 34 installed in the sleeve 32 and the valve core 33, the restoring spring to restore the armature 34 toward the valve housing 31 when no power is applied to the excitation coil 35a. 36 is installed, the lower end of the amateur 34 is provided with a two-stage opening and closing device 40 for opening and closing the outlet 31b of the valve housing 31 in two stages at the time of operation of the amateur (34). . At this time, the two-stage opening and closing device 40 is installed in the hollow portion 31c of the valve housing 31 to be retractable, and to support the spool 41 and the spool 41 with the flow path 41a formed at the center thereof. And a support member 42 installed around the spool 41, and a spool restoring spring 43 for providing restoring force to the spool 41 and the support member 42.

The spool 41 is formed to have a diameter substantially similar to that of the small diameter portion 34a of the amateur 34, and the central flow passage 41a is vertically disposed to be long, so that the upper end of the flow passage 41a is the small diameter portion of the amateur 34. Open and close contact with the opening and closing ball 34b coupled to 34a, the lower end is in contact with the outlet 31b of the valve housing 31 to open and close the outlet 31b. At this time, the flow path 41a formed in the spool 41 is formed to have a diameter smaller than the outlet 31b of the valve housing 31, and the lower end of the spool 41 may be in close contact with the outlet 31b of the valve housing. It is machined into rounded surfaces.

Support member 42 for supporting the spool 41 is provided in a round cylindrical shape, the lower end is fixed to the outer surface of the spool 41, the upper end is slidably fitted to the outer surface of the small diameter portion (34a) of the armature (34) Lose. In addition, a flow path 42a through which a fluid flows is formed around the support member 42, and a flange portion 42b extended outward so that the aforementioned spool restoring spring 43 can be supported on the upper end of the support member 42. ) Is provided. That is, the spool restoring spring 43 has an upper portion supported by the flange portion 42b of the support member and a lower portion supported by the hollow portion 31c of the valve housing 31 so that the support member 42 and the spool 41 are amateur. Elastic support to restore to (34) side.

Here, a predetermined gap is formed between the outer surface of the small diameter portion 34a of the amateur 34 and the inner surface of the support member 42. The solenoid valve 30 according to the present invention has the aforementioned gap when the amateur 34 is raised. The outer surface of the small diameter portion 34a is closely attached to the inner surface of the support member 42 so that the support member 42 can be pulled upward through the viscosity of the fluid introduced therein. At this time, the gap between the outer surface of the small diameter portion 34a and the inner surface of the support member 42 maintains a close contact with each other while allowing the sliding movement to be possible, and thus the outer diameter d1 of the small diameter portion 34a and the inner diameter of the support member 42. It is preferable to make the difference of (d2) become about 0.04-0.06 mm. In the drawings, reference numeral 45 is a filter member for filtering foreign substances from the fluid, and 46 is a sealing member for preventing leakage of the fluid.

On the other hand, Figure 5 shows another embodiment of the solenoid valve according to the present invention, the friction ring 47 is provided between the outer surface of the small diameter portion (34a) of the armature 34 and the inner surface of the support member (42) According to the operation of the (34), the support member 42 is to be pulled upward. That is, the circular friction ring 47 is fitted into the groove 34c formed around the small diameter portion 34a of the armature 34, thereby supporting the support member 42 through friction between the inner surface of the support member 42 and the friction ring 47. 42) can be pulled more easily, thereby allowing the flow path between the lower end of the spool 41 and the outlet 31b to be opened quickly.

When assembling the solenoid valve 30, the spool restoring spring 43 is inserted into the hollow portion 31c of the valve housing 31, and then the support member 42 to which the spool 41 is coupled is connected to the valve housing 31. After the support member 42 is assembled, the small diameter portion 34a of the armature 34 enters the inside of the support member 42. Therefore, as compared with the conventional solenoid valve, Assembly is easy.

The following describes the operation of the solenoid valve according to the present invention configured as described above.

Since the solenoid valve 30 maintains the state in which the armature 34 is advanced toward the valve housing 31 by the elasticity of the restoring spring 36, the outlet 31b of the valve housing is provided through the lower end of the spool 41. It is closed and the flow path 41a of the upper part of the spool 41 is maintained through the opening-closing ball 34b.

When power is applied to the excitation coil 35a in this state, the armature 34 is moved toward the valve core 33 by the magnetic force generated between the armature 34 and the valve core 33 to open the flow path. At this time, since the pressure acting on the spool 41 is large when a high braking pressure is applied to the inlet 31a of the valve, the armature 34 is raised before the spool 41 as shown in FIG. 3. The opening and closing ball 34b is spaced apart from the upper portion of the spool 41 so that the flow passage 41a of the upper portion of the spool is opened first. At this time, the fluid introduced into the inlet 31a is supplied toward the outlet 31b through the flow passage 41a formed in the spool 41.

When the fluid introduced into the upper portion of the spool 41 is supplied toward the outlet 31b of the valve housing 31 and the pressure difference between the inlet 31a side and the outlet 31b side decreases, as shown in FIG. 4. The lower end of the spool 41 is spaced apart from the outlet 31b of the valve housing 31 as the spool 41 and the support member 42 are secondarily raised by the elasticity of the spool restoring spring 43. Therefore, at this time, since the fluid flowing into the inlet 31a flows directly to the outlet 31b of the valve housing having a large diameter, the fluid flow from the inlet 31a to the outlet 31b is smooth. In this case, since the support member 42 and the spool 41 are about to rise due to the fluid viscosity between the small diameter portion 34a of the amateur and the inner surface of the support member 42 or the friction of the friction ring 47, the opening of the flow path is prevented. It is done more quickly.

As described in detail above, the brake system solenoid valve according to the present invention is simplified in the configuration of the support member and the spool coupled to the small diameter portion of the amateur, the assembly structure of the support member, the spool, the spool restoring spring is improved, It is easy to manufacture and assemble.

In addition, the present invention has the effect that the opening of the flow path more quickly because the support member and the spool is raised by the fluid viscosity and friction between the small diameter portion of the amateur and the inner surface of the support member when the small diameter portion of the amateur rises.

Claims (4)

A hollow valve housing in which a fluid inlet port is formed and a fluid outlet port is formed at one end thereof, a hollow sleeve coupled to the other end of the valve housing opposite to the outlet port, of the sleeve located opposite the valve housing A magnetic valve core coupled to the other end, an armature removably installed in the sleeve, and a small diameter portion having a small diameter entered into the valve housing by a predetermined length, and an excitation coil installed outside the valve core and the sleeve to advance and retract the amateur. A restoring spring installed between the valve core and the armature to advance the armature toward the valve housing when no power is applied to the excitation coil, and the valve housing so that the outlet port is sequentially opened and closed in two stages when the armature is operated. Removably installed within One end of the flow path formed in the hem is opened and closed in contact with the small diameter portion of the amateur, the end is in contact with the outlet, the spool for opening and closing the outlet, one end is fixed to the outer surface of the spool so as to support the spool and the other end is small A brake system, comprising: a hollow support member slidably fitted to an outer surface of a neck and having a flow path therethrough, the spool restoring spring being installed on the outside of the support member to elastically support the support member toward the armature. Solenoid valve. The method of claim 1, The end of the support member to be fitted to the amateur solenoid valve for a brake system, characterized in that the flange portion extending outward for supporting the spool restoring spring is provided. The method of claim 1, The solenoid valve for the brake system, characterized in that the difference between the outer diameter of the small diameter portion of the amateur and the inner diameter of the support member so that the support member can be pulled by the viscosity of the fluid during operation of the amateur. The method of claim 1, A solenoid valve for a brake system, characterized in that a friction ring fixed to one side is provided between the outer surface of the amateur and the inner surface of the support member so that the support member can be pulled by friction during operation of the armature.