| 摘要 |
The present invention relates to a master cylinder for a vehicle, for generating hydraulic pressure in the hydraulic brake device of the vehicle. The master cylinder for a vehicle according to the present invention comprises: a housing formed with a liquid pressure chamber in such a way as to be able to accommodate oil on the inside; a piston which is inserted into the liquid pressure chamber, and which adjusts the pressure of the liquid pressure chamber by means of a reciprocating motion, and which also has a stepped level difference formed in its front-end part; a plurality of inflow ports for supplying the oil to the liquid pressure chamber, which are provided in the housing; and a chamber for opening and closing a pathway for oil movement in accordance with whether or not it is in contact with the piston, which said chamber is secured to a groove formed on the inner surface of the housing with a clearance of a predetermined interval from the inflow ports. The oil moves through the space formed between the piston and the chamber and follows the stepped outer circumferential surface of the piston into the liquid pressure chamber, while the space between the outer circumferential surface of the piston and the chamber is supplied by an oil-movement pathway. The present invention makes it possible to reduce processing costs and makes it possible to prevent chamber damage caused by pressure from liquid flowing backwards during disengagement from braking following a TCS or ESC operation. |
