- Master cylinder for electro - hydraulic braking system comprising means improved simulating the pedal feel and the braking system comprising such an electro - hydraulic master cylinder -

摘要

The present invention is to provide a master - cylinder for electro - hydraulic braking systems for a motor vehicle comprising a cartridge simulating the pedal feel, in communication, in normal operation with a working chamber of the master - cylinder, the said cartridge, including a piston capable of being subjected, by a first face to the brake fluid under pressure supplied by the working chamber, and is subjected by a second face with an elastic means of variable stiffness, the elastic means comprising at least a first helical spring and a second helical spring, the first spring comprising the first turns and being mounted in bearing relationship between the second face of the piston of the cartridge and a bottom of the cartridge, the second spring having the second turns and being mounted coaxially to the first spring so that a turn of the second spring forms a mobile means of support for a turn of the first spring.