Brake booster

Details Brake booster Brake booster

1999-01-19

2000-07-18

Lopez, F. Daniel

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 91434, 60552, F15B 910

Patent

active

060891408

ABSTRACT:
A brake booster which permits an axial relative movement between a power piston and a valve body is disclosed. An arrangement is made which prevents a brake reaction from being transmitted to a brake pedal. As an alternative therefor, pseudo-reaction imparting means transmits a pseudo-reaction to a brake pedal. A rear end of the valve body is covered by a tubular cover and bellows connected thereto, and its internal space is maintained in communication with a constant pressure chamber. The bellows has an effective diameter which is chosen to be of an equal size to the diameters of a vacuum valve seat and an atmosphere valve seat. This allows a pseudo-reaction and a brake pedal stroke to be obtained which depend on the force with which a brake pedal is depressed if a negative pressure within the constant pressure chamber varies, thus imparting a better brake feeling to a driver.

REFERENCES:
patent: 3152518 (1964-10-01), Ayers
patent: 5233907 (1993-08-01), Gautier et al.
patent: 5802952 (1998-09-01), Ikeda

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