Vehicle brake device

Abstract

The present disclosure relates to a vehicle brake device comprising: a pump housing having an inlet and an outlet through which a fluid flows; a valve body inserted and fixed to the pump housing; a plunger positioned in the valve body and configured to be moved by the armature; a seat mounted inside the valve body and having a passage hole through which the fluid passes, the seat being configured to block the flow of the fluid when positioned in contact with the plunger; a flow path formed between the seat and the valve body through which a fluid flows; an elastic portion interposed between the seat and the plunger and configured to elastically support the plunger; and a sealing portion pressed into the pump housing and the seat and including a passage through which a fluid flows, the valve body seated on the sealing portion. The present disclosure provides a sealing portion pressed into a pump housing and a seat and constrained by a valve body to fix a position of the sealing portion, which may block fluid pressure acting in both directions of an inlet and an outlet during operation of a plunger and may prevent leakage of fluid.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to a vehicle brake apparatus, and more particularly, to a vehicle brake apparatus capable of controlling fluid pressure acting on vehicle wheels. Background Art

[0002] Generally, an anti-lock braking system (ABS) for a vehicle detects wheel slip and controls the brake pressure applied to the wheel to prevent the wheel from locking during braking. This ensures that the wheel does not slip during braking and maintains its direction for safe braking.

[0003] The ABS combination is used as a component of the Electronic Stability Control (ESC). ESC is a control device that allows the driver to maintain lane without losing the ability to steer the vehicle when suddenly manipulating the steering wheel or driving on a winding road.

[0004] An electronic brake system for a vehicle includes a plurality of solenoid valves configured to open and close a passage of a brake hydraulic line to control brake pressure. Examples of solenoid valves include a normally open solenoid valve, which is normally kept open, and a normally closed solenoid valve, which is normally kept closed.

[0005] The related technology of the present disclosure is disclosed in Korean Patent No. 10-2553467 (published on July 10, 2023, titled "NORMALLY OPEN SOLENOID VALVE APPLIED TO AUTOMOBILE BRAKE SYSTEM"). Summary of the invention

[0006] Various embodiments are directed to a vehicle brake apparatus capable of blocking fluid pressure acting in both directions of a master cylinder and a wheel cylinder.

[0007] In one embodiment, a vehicle brake device is provided, which includes: a pump housing having an inlet and an outlet for a fluid to flow through; a valve body, which is inserted into and fixed to the pump housing; a plunger, which is positioned in the valve body and is configured to be moved by an armature; a seat, which is mounted inside the valve body and has a channel hole for the fluid to pass through, and the seat is configured to block the flow of the fluid when positioned in contact with the plunger; a flow path, which is formed between the seat and the valve body, and the fluid flows through the flow path; an elastic part, which is placed between the seat and the plunger and is configured to elastically support the plunger; and a sealing part, which is pressed into the pump housing and the seat and includes a channel for the fluid to flow through, and the valve body is seated on the sealing part.

[0008] The sealing portion may include: a first sealing member, the first sealing member including a first communication channel positioned to communicate with the outlet fluid and a first port extending through an outer surface of the first sealing member and positioned to communicate with the channel hole fluid; and a second sealing member, the second sealing member being arranged on the outside of the first sealing member and surrounding the first sealing member, the second sealing member including a second communication channel positioned to communicate with the flow path fluid.

[0009] The first sealing member may be pressed into the seat; and the second sealing member is pressed into the pump housing, the valve body sitting on the second sealing member.

[0010] An upper end of the first sealing member may extend further toward the plunger than an upper end of the second sealing member.

[0011] The second sealing member may include: a first extension portion, which extends from a lower end of the first sealing member in a radial direction of the first sealing member; and a second extension portion, which extends from an outer end of the first extension portion in a longitudinal direction of the first sealing member, and the second extension portion includes at least one second port connected to the inlet fluid.

[0012] The at least one second port may include a plurality of second ports spaced apart from one another around a circumference of the second extension.

[0013] The at least one second port may include a through hole extending through the second extension.

[0014] The at least one second port may include a stepped portion recessed from an upper edge of the second extending portion.

[0015] The vehicle brake device may further include a first filter disposed between the inlet and the second sealing member to filter the fluid.

[0016] The vehicle brake device may further include a second filter disposed between the outlet and the sealing portion to filter the fluid.

[0017] As is apparent from the above description, the present disclosure provides a sealing portion that is pressed into a pump housing and a seat and constrained by a valve body to fix the position of the sealing portion, which can block fluid pressure acting in both directions of the inlet and outlet during operation of the plunger and can prevent leakage of the fluid.

[0018] Furthermore, the present disclosure has an effect of reducing material cost by eliminating various processing methods by simplifying the shape of the sealing portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view showing a vehicle brake device according to a first embodiment of the present disclosure.

[0020] Figure 2 is a perspective view showing a sealing portion of a vehicle brake device according to a first embodiment of the present disclosure.

[0021] Figure 3 is a cross-sectional view showing a vehicle brake device according to a second embodiment of the present disclosure.

[0022] Figure 4 is a perspective view showing a sealing portion of a vehicle brake device according to a second embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Hereinafter, a vehicle brake device according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. It should be taken into account that the thickness of each line or the size of each component in the accompanying drawings may be exaggerated for the sake of clarity and ease of description. In addition, the terms used herein are terms defined in consideration of the functions of the present disclosure, and these terms may be changed according to the intention or practice of the user or operator. Therefore, these terms should be defined based on the entire disclosure set forth herein.

[0024] Figure 1 is a cross-sectional view showing a vehicle brake device according to a first embodiment of the present disclosure. Figure 2 is a perspective view showing a sealing portion of a vehicle brake device according to a first embodiment of the present disclosure.

[0025] See also Figure 1 and Figure 2 The vehicle brake device according to the first embodiment of the present disclosure includes a pump housing 100 , a valve body 200 , a plunger 300 , a seat 400 , a flow path 500 , an elastic portion 600 , and a sealing portion 700 , which will be described in detail below.

[0026] The pump housing 100 includes an inlet 110 and an outlet 120 through which a fluid flows. In other words, the inlet 110 corresponding to a passage through which a fluid is introduced and the outlet 120 corresponding to a passage through which a fluid is discharged may be formed in the pump housing 100 .

[0027] The pump housing 100 where the inlet 110 and the outlet 120 intersect may have a receiving groove cut and machined to install the constituent components of the vehicle brake device according to the embodiment of the present disclosure. The inlet 110 may be connected to a master cylinder (not shown), and the outlet 120 may be connected to a wheel cylinder (not shown).

[0028] The passage leading from the inlet 110 to the outlet 120 is a passage through which the brake hydraulic pressure is transmitted to the wheels of the vehicle via the pump when there is a risk of the vehicle accidentally rotating on an icy road or the like, that is, when the ESC function is activated.

[0029] The vehicle brake apparatus according to an embodiment of the present disclosure may include a normally open solenoid valve that closes a passage by an electromagnetic force when current is applied to the solenoid valve.

[0030] The valve body 200 is partially inserted into and fixed to the pump housing 100. In other words, the valve body 200 may be Figure 1 The lower side of the pump housing 100 is pressed into the pump housing 100 and is connected to the pump housing 100 by riveting or the like.

[0031] For ease of explanation, the valve body 200 is shown to be perpendicular to the pump housing 100 and to be in axial communication with the pump housing 100 .

[0032] The plunger 300 is accommodated in the valve body 200. The plunger 300 is operated by the armature 800 to reciprocate in the axial direction of the valve body 200. The plunger 300 may include a plunger body 300a and a ball member 310. The ball member 310 may be installed at one end ( Figure 1 at the lower end of the middle).

[0033] The vehicle brake device may include a sleeve 900 configured to surround the armature 800 and extend to a set length toward the pump housing 100 to surround a portion of the valve body 200 .

[0034] The plunger 300 reciprocates in the valve body 200 by the combined force of the electromagnetic force generated by the armature 800 , the elastic force of the elastic portion 600 , and the pressure of the fluid flowing through the seat 400 .

[0035] The electromagnetic force generated by the armature 800 is along Figure 1 The downward direction in the piston acts on the plunger 300. The fluid pressure introduced through the seat 400 Figure 1 The upward direction in the middle acts on the plunger 300. The elastic force of the elastic portion 600 is along Figure 1 The upward direction in acts on the plunger 300.

[0036] Among these forces acting on the plunger 300, the electromagnetic force generated by the armature 800 varies with the intensity of the current applied from the outside. Therefore, the movement of the plunger 300 can be controlled by adjusting the intensity of the applied current.

[0037] The seat 400 is disposed in the pump housing 100 and mounted in the valve body 200. In other words, the seat 400 may be mounted on one side of the valve body 200 ( Figure 1 In the hollow portion of the lower side).

[0038] The seat 400 is located on one side of the plunger 300 ( Figure 1 The seat 400 has a passage hole 410 for fluid to pass through. Figure 1 The channel hole 410 formed on the upper surface of the piston 300 is directed to the piston 300.

[0039] The seat 400 selectively blocks the flow of the fluid by contacting the plunger 300. The ball member 310 provided at the end of the plunger body 300a facing the seat 400 contacts or releases contact with the channel hole 410 of the seat 400, while moving together with the plunger body 300a by the electromagnetic force of the armature 800, thereby opening or closing the channel hole 410. In other words, when the plunger body 300a moves toward the seat 400, the ball member 310 contacts the seat 400 to block the flow of the fluid through the seat 400.

[0040] The flow path 500 is formed between the seat 400 and the valve body 200. The fluid flows through the flow path 500. The flow path 500 may be formed in the valve body 200 and serves to guide the flow of the fluid so that the fluid introduced through the inlet 110 may flow toward the channel hole 410 of the seat 400.

[0041] The elastic portion 600 is interposed between the seat 400 and the plunger 300 to elastically support the plunger 300. One side of the elastic portion 600 sits on the seat 400, and the other side of the elastic portion 600 sits on the plunger 300 to provide elastic force to the plunger 300. The elastic portion 600 may be an elastically deformable coil spring.

[0042] When the armature 800 does not work due to the absence of magnetic force thereon, the passage hole 410 of the seat 400 is always opened as a normally open type to allow the fluid to move freely. That is, the fluid flows freely to the inlet 110 and the outlet 120.

[0043] The sealing portion 700 is pressed into the pump housing 100 and the seat 400, and the valve body 200 is seated on the sealing portion 700. The sealing portion 700 forms a passage for fluid to flow through. The sealing portion 700 may be made of a metal material and manufactured by forging or pressing.

[0044] When the plunger 300 is operated, the sealing portion 700 may block fluid pressure in both directions of the inlet 110 and the outlet 120 and may prevent leakage of the fluid. The sealing portion 700 may include a first sealing member 710 and a second sealing member 720.

[0045] The first sealing member 710 may be in a hollow form and have a first communication passage 711 provided therein to communicate with the outlet 120. The outer surface ( Figure 1An upper surface in the middle may be provided with a first port 712 communicating with the channel hole 410 of the seat 400.

[0046] The first sealing member 710 may be pressed into the seat 400. In other words, an upper portion of the first sealing member 710 may be pressed upward into the seat 400 so that a position of the first sealing member 710 is fixed by the seat 400.

[0047] The second sealing member 720 may be disposed at an outer side of the first sealing member 710 and may be formed to surround a periphery of the first sealing member 710. The second sealing member 720 may be integrally formed with the first sealing member 710 and may be spaced apart from the first sealing member 710.

[0048] The second sealing member 720 may be in a hollow form and have a second communication passage 720 a provided therein to communicate with the flow path 500 .

[0049] The second sealing member 720 may be pressed into the pump housing 100 so that its position is fixed by the pump housing 100. In addition, the valve body 200 may be seated on an upper edge of the second sealing member 720 so that the second sealing member 720 is restrained by the valve body 200.

[0050] The second sealing member 720 may include a first extending portion 721 and a second extending portion 722. The first extending portion 721 may be bent from an end portion of the first sealing member 710 and extend in a radial direction of the first sealing member 710.

[0051] The second extension portion 722 may be bent from an end of the first extension portion 721 and extend in the longitudinal direction of the first sealing member 710. The second extension portion 722 may be provided with a second port 723 communicating with the inlet 110. The fluid may flow to the inlet 110 and the second communication channel 720a of the second sealing member 720 through the second port 723.

[0052] The second port 723 may include a plurality of second ports spaced apart in the circumferential direction of the second extension 722. The second ports 723 may each include a through hole 723a formed through the outer surface of the second extension 722. The upper end of the first sealing member 710 protrudes further toward the plunger 300 than the upper end of the second sealing member 720.

[0053] The vehicle brake apparatus according to the first embodiment of the present disclosure may further include a first filter 1000 and a second filter 1100 .

[0054] The first filter 1000 may be disposed between the inlet 110 and the second sealing member 720 to filter the fluid. The first filter 1000 may filter impurities contained in the fluid flowing to the second port 723 of the second sealing member 720 through the inlet 110 or flowing to the inlet 110 through the second port 723.

[0055] The second filter 1100 may be disposed between the outlet 120 and the sealing portion 700 to filter the fluid. The second filter 1100 may filter foreign matter contained in the fluid flowing toward the outlet 120 through the first communication channel 711 of the first sealing member 710 or flowing toward the first communication channel 711 through the outlet 120.

[0056] Figure 3 is a cross-sectional view showing a vehicle brake device according to a second embodiment of the present disclosure. Figure 4 is a perspective view showing a sealing portion of a vehicle brake device according to a second embodiment of the present disclosure.

[0057] See also Figure 3 and Figure 4 The vehicle brake device according to the second embodiment of the present disclosure is substantially similar to the vehicle brake device according to the first embodiment except for the shape of the second port 723 provided in the second extension portion 722. Therefore, the same reference numerals will be assigned to the same components and their descriptions will be omitted.

[0058] The second port 723 may include a stepped portion 723b recessed from an edge of the second extension portion 722. The second port 723 may be formed on an upper edge of the second extension portion 722 on which the valve body 200 is seated and which contacts the lower end of the valve body 200. For example, the second port 723 may be chamfered by cutting and machining.

[0059] The second port 723 may be stepped on the edge of the second extension 722 to form a gap communicating with the inlet 110 between the second extension 722 and the valve body 200. The fluid may flow to the inlet 110 and the second communication passage 720a of the second sealing member 720 through the second port 723. The second port 723 may include a plurality of second ports spaced apart in the circumferential direction of the second extension 722.

[0060] The vehicle braking device according to an embodiment of the present disclosure provides a sealing portion 700, which is pressed into the pump housing 100 and the seat 400 and is restricted by the valve body 200 to fix the position of the sealing portion 700, which can block the fluid pressure acting in two directions along the inlet 110 and the outlet 120 during the operation of the plunger 300 and can prevent leakage of the fluid.

[0061] The vehicle brake device according to the embodiment of the present disclosure may reduce material costs by eliminating various processing methods by simplifying the shape of the sealing portion 700 .

[0062] The embodiments of the present disclosure are described in an exemplary manner only with reference to the accompanying drawings. It can be understood by those skilled in the art that various modifications can be made to the embodiments and various equivalents thereof can be implemented.

Claims

1. A vehicle braking device, comprising: a pump housing having an inlet and an outlet for fluid to flow through; a valve body inserted into and fixed to the pump housing; a plunger positioned in the valve body and configured to be moved by an armature; a seat installed inside the valve body and having a passage hole for the fluid to pass through, the seat being configured to block the flow of the fluid when positioned in contact with the plunger; a flow path formed between the seat and the valve body, the fluid flowing through the flow path; an elastic portion disposed between the seat and the plunger and configured to elastically support the plunger; as well as A sealing portion is pressed into the pump housing and the seat and includes a passage for the fluid to flow through, and the valve body is seated on the sealing portion.

2. The vehicle braking device according to claim 1, wherein: The sealing portion comprises: a first sealing member including a first communication channel positioned in fluid communication with the outlet and a first port extending through an outer surface of the first sealing member and positioned in fluid communication with the channel hole; and A second sealing member is disposed outside the first sealing member and surrounds the first sealing member, the second sealing member including a second communication passage positioned to be in fluid communication with the flow path.

3. The vehicle braking device according to claim 2, wherein: The first sealing member is pressed into the seat; and The second sealing member is pressed into the pump housing, and the valve body is seated on the second sealing member.

4. The vehicle braking device according to claim 3, wherein: An upper end of the first sealing member extends further toward the plunger than an upper end of the second sealing member.

5. The vehicle braking device according to claim 2, wherein: The second sealing member comprises: a first extending portion extending from a lower end of the first sealing member in a radial direction of the first sealing member; and A second extension portion extends from an outer end of the first extension portion in a longitudinal direction of the first sealing member, the second extension portion including at least one second port in fluid communication with the inlet.

6. The vehicle braking device according to claim 5, wherein: The at least one second port includes a plurality of second ports spaced apart from one another around a perimeter of the second extension.

7. The vehicle braking device according to claim 5, wherein: The at least one second port includes a through hole extending through the second extension.

8. The vehicle braking device according to claim 5, wherein: The at least one second port includes a stepped portion recessed from an upper edge of the second extending portion. 9 . The vehicle brake device of claim 5 , further comprising a first filter disposed between the inlet and the second sealing member to filter the fluid. 10 . The vehicle brake device according to claim 9 , further comprising a second filter disposed between the outlet and the sealing portion to filter the fluid.

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