Pulsation pressure decreased type pump for vehicle slip control system

Abstract

The present invention provides a pulsation pressure decreased type pump. When an oil pump that is driven by a motor during the operation of an electronically controlled brake system discharges a working fluid, the working fluid passes through an annular orifice provided at a position where the working fluid is discharged and is then discharged to an outlet of a pump housing through an outflow channel formed in the orifice so as to decrease a pulsating pressure using a piston reciprocated by a cam. Therefore, it is possible to decrease a pulsating pressure generated in the pump from 20 bar to 5 bar or less.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is based on, and claims priority from, Korean Application Serial Number 10-2007-0059757, filed on Jun. 19, 2007, the disclosure of which is hereby incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a pump for a vehicle slip control system, and more particularly, to a pulsation pressure decreased type pump.BACKGROUND OF THE INVENTION[0003]In general, a brake of a vehicle is used to stop a vehicle or reduce the speed of a vehicle by transmitting a braking pressure, which is a hydraulic pressure, to a wheel brake on the basis of the operation of a brake pedal. Since a running vehicle is forcibly stopped by the brake, the vehicle occasionally is slipped due to the braking pressure or road conditions during braking.[0004]A brake, which electronically controls the braking pressure of the wheel brake, has been widely used to prevent the slip from occurring. That i...

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Benefits of technology

[0007]Embodiments of the present invention help overcome the drawbacks of the brake system and provide a pulsation pressure decreased type pump for a vehicle slip control system that includes an orifice provided on a discharge channel of a pump that discharges a working fluid using a piston reciprocated by a cam during operation. When the pump discharges the working fluid, the orifice related with an outlet check valve controls the amount of the working fluid, so that a pulsating pressure caused by pulsation superposition is decreased from 20 bar to 5 bar or less.

[0008]Further, embodiments of the present invention provide a pulsation pressure decreased type pump including an orifice, which is formed by pressing, so as to minimize manufacturing cost and time required to manufacture and machine the orifice. The orifice decreases a pulsating pressure, which is generated at an outlet when a pump discharges a working fluid, to 5 bar or less.

[0009]Furthermore, embodiments of the present invention provide a pulsation pressure decreased type pump including an orifice, which has a discharge channel directly formed therein and is directly fixed to a sleeve. Accordingly, a discharge channel does not need to be formed in a sleeve fixed to a cap, and the sleeve does not need to be machined for the assembling of the orifice.

[0010]In addition, embodiments of the present invention provide a pulsation pressure decreased type pump including an orifice, which is provided at an outlet in a pump and directly fixed to an end of a sleeve. Accordingly, since centering between the orifice and the sleeve does not need to be performed, it is possible to easily perform assembly.

Problems solved by technology

Since a running vehicle is forcibly stopped by the brake, the vehicle occasionally is slipped due to the braking pressure or road conditions during braking.

However, when operating, the oil pump forming the entire brake hydraulic circuit sucks or discharges the oil by a piston that is reciprocated by the motor.

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