KR20110016545A - Pump for brake system - Google Patents

Abstract

PURPOSE: A pump for a brake system is provided to improve the productivity of the pump and to simplify an assembling process by using a pump assembly. CONSTITUTION: A pump for a brake system comprises a modulator block(20), a bore(21), a filter member(31), and a pump assembly. The modulator block has an inlet(22) and an outlet(23). The bore is formed in the modulator block. The filter member filters oil flowing through the inlet. The pump assembly is integrally formed in the bore and has a piston(41), an inlet valve(50), an outlet valve(60), return springs(63), a stopper member(70), a guide ring(80), and a sealing member(90).

Description

Pump for brake system {PUMP FOR BRAKE SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for a brake system, and more particularly, to a pump for a brake system which reduces the number of components and improves the assembly process.

An electronically controlled brake system mounted on a vehicle is a device that provides safe braking by preventing a road slip of the wheel by controlling brake hydraulic pressure transmitted to the wheel side of the vehicle.

The brake system includes a plurality of solenoid valves, a low pressure accumulator and a high pressure accumulator for temporarily storing oil, a motor and a pump for pumping oil temporarily stored in the low pressure accumulator, and an electronic control unit for controlling the operation of the solenoid valve and the motor. These components are interconnected and compactly coupled through a plurality of flow paths formed inside a modulator block made of aluminum.

1 is a schematic cross-sectional view of a pump provided in a modulator block of a general brake system.

As shown in FIG. 1, the conventional pump moves forward and backward in the bore 5 formed in the modulator block 4 while advancing by the eccentric shaft 3 provided in the motor in the eccentric shaft operation chamber 2. Piston assembly (9) to be installed, discharge valve assembly (11) which is installed in bore (5) and divides bore (5) into pressure chamber (6) and discharge chamber (7), and flows in through inlet (8) Filter assembly 12 for filtering the oil to be made, sealing rings (13, 14) provided between the bore (5) and the piston (10) to prevent leakage of oil, and the sealing ring (13) in the bore (5) 14 and backup rings 15 and 16 provided between the bore 5 and the piston 10 to guide the piston 10 and the piston 10, respectively, are provided as separate parts to be assembled in the bore 5 of the modulator block 4. Is installed.

Therefore, not only the number of processes for assembling the pump in the bore 5 increases, but in particular, when the sealing ring 14 is fixed to the modulator block 4, it is difficult to identify the failure of the pump before assembly. .

One aspect of the present invention provides a pump for a brake system that can reduce the assembly process of the pump as well as enable a single quality test of the pump before assembly.

To this end, a pump for a brake system according to an embodiment of the present invention includes a modulator block having an inlet and an outlet; a bore formed in the modulator block; and a filter member for filtering oil introduced through the inlet from the bore. And, a pump assembly integrally formed and installed in the bore, wherein the pump assembly is provided to be capable of linear reciprocating motion in the bore, and includes a piston having an oil flow path and opening and closing an outlet of the oil flow path. An outlet valve including an inlet valve coupled to the front end of the piston, a plug having a pressure chamber accommodating the front end of the piston to control discharge of the compressed oil by the reciprocating motion of the piston, and a front end of the piston A return spring provided in the pressurizing chamber to support the piston, and the piston from the plug. A stopper member coupled to the open portion of the plug to prevent separation of the plug, a guide ring coupled to the stopper member to guide movement of the piston, and a stopper member and the seal to seal between the piston and the guide ring. It may include a sealing member provided between the guide ring.

The inlet valve may include a valve opening and closing member for opening and closing the oil passage, a valve spring for elastically supporting the valve opening and closing member, and a holder for receiving and supporting the valve opening and closing member and the valve spring.

In addition, the stopper member includes a press-fitting part press-fitted to the inner circumferential surface of the plug, and a joining part extending from one end of the press-fitting part to be engaged with the guide ring, and the joining part includes a flange part protruding outward from the end of the holder. A hanging jaw may be provided to be supported.

In addition, the guide ring may be provided to surround the sealing member, and one side of the inner circumferential surface of the guide ring may be provided with a locking protrusion inserted into the locking groove formed on the outer peripheral surface of the coupling part.

In addition, the guide ring may be press-fit to the outer peripheral surface of the coupling portion.

In addition, the shape of the coupling part in contact with the sealing member may be formed in a shape corresponding to the contact surface of the sealing member to be in close contact with the sealing member.

In addition, the inner side of the bore adjacent to the rear end of the piston may further include a sealing member for sealing between the piston and the bore and a backup ring for supporting a sealing member provided between the piston and the bore.

As described above, the pump for the brake system according to the embodiment of the present invention can improve productivity by simplifying the assembly process according to the pump assembly that can be preassembled into one component.

In addition, the pump assembly of the pump for the brake system is able to test the quality of the unit separately, it is possible to detect the failure before assembly, thereby reducing the failure rate of the pump.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the technical spirit of the pump for a brake system of the present invention as described above are as follows.

2 is a cross-sectional view showing a pump for a brake system according to an embodiment of the present invention, FIG. 3 is an enlarged view of a portion 'A' of FIG. 2, and FIG. 4 is a pump for a brake system according to an embodiment of the present invention. Sectional drawing which shows the state of the pump assembly of FIG.

2 to 4, the pump of the brake system according to an embodiment of the present invention is a pump assembly 40 installed in the bore 21 of the modulator block 20 having an inlet 22 and an outlet 23. ).

As shown in FIG. 4, the pump assembly 40 may be provided as one module and installed in the bore 21 of the modulator block 20.

In addition, the pump of the brake system is provided with an eccentric bearing 28 coupled to the rotating shaft 27 of the motor in the modulator block 20 to operate in the eccentric shaft operation chamber 26, the pump assembly 40 is an eccentric bearing ( 28 includes a piston 41 linearly reciprocating in the bore 21 by receiving a force from the.

The bore 21 is divided into an inlet chamber 24 in which oil is in communication with the inlet port 22, and a discharge chamber 25 in which oil is discharged in communication with the outlet port 23.

Inside the bore 21 adjacent to the eccentric shaft operation chamber 26, a sealing member 29 for sealing between the piston 41 and the bore 21, and a sealing member 29 are supported to move the piston 41. The backup ring 30 is provided to guide.

Inside the bore 21 in which the inlet chamber 24 is formed, a filter member 31 for filtering oil flowing into the inlet chamber 24 through the inlet port 22 is fixed.

An oil passage 42 through which oil moves is formed in the piston 41, and a valve seat 43 is provided at an outlet side of the oil passage 42, that is, at the tip of the piston 41, and the valve seat 43. The inlet valve 50 for opening and closing the outlet of the oil passage 42 is provided.

The inlet valve 50 has a valve opening and closing member 51 and a valve spring 53 for elastically supporting the valve opening and closing member 51 provided to be in contact with or spaced from the valve seat 43, and a holder 55 for receiving and supporting them. It includes.

The valve opening and closing member 51 opens the oil passage 42 by the oil pressure difference and closes the oil passage 42 by the elastic force of the valve spring 53.

In addition, the pump assembly 40 includes an outlet valve 60 for controlling the discharge of the compressed oil by the reciprocating motion of the piston (41).

The outlet valve 60 includes a plug 61 provided with a pressurizing chamber 62 in which the front end of the piston 41 is accommodated.

The piston 41 slidably reciprocates the inside of the plug 61 by a predetermined distance to form the pressurizing chamber 62 when the piston 41 is advanced, and the holder 55 installed at the tip of the piston 41 is pressurized chamber. The piston 41, which is elastically supported by the return spring 63 across the 62 and is advanced for the compression of the oil, can be retracted by the return spring 63.

The plug 61 is provided with an orifice 64 through which the compressed oil moves in communication with the pressure chamber 62 and the discharge chamber 25.

In addition, the outlet valve 60 includes a shield valve 65 for opening and closing the orifice 64 in the discharge chamber 25, a valve spring 53 for elastically supporting the shield valve 65, and a valve spring 53. A retainer 67 coupled to the end of the plug 61 to support it.

In addition, the pump assembly 40 includes a stopper member 70 coupled to the opened portion of the plug 61 to prevent the piston 41 from being separated from the plug 61 by the elastic force of the return spring 63, and the piston. A guide ring 80 coupled with the stopper member 70 to guide the movement of the 41, and a sealing member 90 for sealing between the piston 41 and the guide ring 80.

The stopper member 70 is formed of one of a metal, rubber, or functional plastic material, and is formed at one end of the press-fit part 71 to be coupled to the guide ring 80 by a press-fit part 71 fixed to the inner circumferential surface of the plug 61. It has an extended coupling portion 73.

The engaging portion 73 is caught by the flange portion 57 protruding outward from the end of the holder 55 to prevent the piston 41 from being separated from the plug 61 by the elastic force of the return spring (63) The jaw 74 is provided.

The guide ring 80 is formed in a shape surrounding the sealing member 90 so as to prevent the flow of the sealing member 90 provided inside the guide ring 80 and is coupled to the stopper member 70.

To this end, a locking groove 75 is formed on the outer circumferential surface of the engaging portion 73 of the stopper member 70 and a locking protrusion 81 is inserted into the locking groove 75 on one side of the inner circumferential surface of the guide ring 80.

In this embodiment, the stopper member 70 and the guide ring 80 are coupled to each other by the locking groove 75 and the locking protrusion 81, but this is only an example, and the guide ring 80 is an outer surface of the stopper member 70. It can be fixed through a known coupling method, such as through a press-fit or hook coupling.

The sealing member 90 is to seal the oil so as not to leak by maintaining the airtight between the guide ring 80 and the piston 41, it may be made of a lip seal (X-seal, O-ring, etc.) .

One side of the sealing member 90 is supported by the guide ring 80, the other side is supported by the engaging portion 73 of the stopper member 70 between the guide ring 80 and the stopper member 70 to limit the movement To be prepared.

To this end, the coupling portion 73 of the stopper member 70 may be formed in a shape corresponding to the sealing member 90 to support the sealing member 90.

That is, when the sealing member 90 is made of a lip seal, the coupling portion 73 is formed in a protrusion shape corresponding to the shape of the groove 91 so as to be inserted into and closely contact the groove 91 of the lip seal, and the sealing member 90 When X-seal is made of O-ring, it may be made in a flat shape that is in close contact with it.

Reference numeral 32 is a cover member 32 coupled to the modulator block 20 to seal the discharge chamber 25.

Therefore, the pump for the brake system is a pump in which the piston 41, the inlet valve 50, the outlet valve 60, the stopper member 70, the guide ring 80 and the sealing member 90 are integrally assembled. Since the assembly 40 can be simply assembled by pushing the assembly 40 into the bore 21 of the modulator block 20, the assembly process is simple and productivity is improved.

In addition, the preassembled pump assembly 40 can determine whether the defect before assembly in the bore 21 of the modulator block 20 can significantly reduce the defective rate of the pump.

1 is a schematic cross-sectional view of a conventional pump for a brake system.

2 is a cross-sectional view showing a pump for a brake system according to an embodiment of the present invention.

3 is an enlarged view of a portion 'A' of FIG. 2.

Figure 4 is a cross-sectional view showing a state in which the pump assembly of the pump for the brake system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20: Modulator Block 21: Bore

30: backup ring 31: filter member

40: filter assembly 41: piston

50: inlet valve 60: outlet valve

70: stopper member 71: press-fitting portion

73: coupling portion 74: locking jaw

75: locking groove 80: guide ring

81: locking projection 90: sealing member

91: home

Claims (7)

A modulator block having an inlet and an outlet; and a bore formed in the modulator block; and a filter member for filtering oil introduced through the inlet from the inside of the bore; and a pump assembly integrally formed and installed in the bore; Including, The pump assembly is provided with a linear reciprocating motion in the bore, a piston having an oil flow path, an inlet valve coupled to the distal end of the piston to open and close the outlet of the oil flow path, and the oil compressed by the reciprocating motion of the piston. An outlet valve including a plug having a pressurizing chamber for accommodating the distal end of the piston, a return spring provided in the pressurizing chamber for elastically supporting the distal end of the piston, and preventing the piston from being detached from the plug. A stopper member coupled to the open portion of the plug, a guide ring coupled to the stopper member to guide movement of the piston, and between the stopper member and the guide ring to seal between the piston and the guide ring. Pump for brake system comprising a sealing member provided. The method of claim 1, The inlet valve includes a valve opening and closing member for opening and closing the oil passage, a valve spring for elastically supporting the valve opening and closing member, and a holder for receiving and supporting the valve opening and closing member and the valve spring. 3. The method of claim 2, The stopper member includes a press-fitting part press-fitted to an inner circumferential surface of the plug, and a joining part extending from one end of the press-fitting part to be engaged with the guide ring, and the joining part is supported by a flange part protruding outward from an end of the holder. Brake system pump, characterized in that the locking jaw is provided. The method of claim 3, wherein The guide ring is provided to surround the sealing member, one side of the inner circumferential surface of the guide ring pump for a brake system, characterized in that the engaging projection is inserted into the engaging groove formed on the outer peripheral surface of the coupling portion is provided. The method of claim 3, wherein The guide ring is a pump for a brake system, characterized in that the press-fit fixed to the outer peripheral surface. The method of claim 3, wherein The coupling part in contact with the sealing member has a shape corresponding to the contact surface of the sealing member so as to be in close contact with the sealing member pump for a brake system. The method according to claim 1 to 6, And a backing ring supporting a sealing member for sealing between the piston and the bore, and a backing ring inside the bore adjacent to the rear end of the piston.

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