Master cylinder apparatus

Details Master cylinder apparatus Master cylinder apparatus

2006-02-28

2006-02-28

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Pulsator

C060S588000

Reexamination Certificate

active

07003954

ABSTRACT:
A master cylinder apparatus for a BBW system is provided, which eliminates a risk of brake delay, even with the use of a plunger-type master cylinder, and which therefore is able to achieve a reduction in size of a master cylinder. The master cylinder apparatus comprises a tandem-type master cylinder connected to wheel cylinders through fail-safe valves and a stroke simulator for ensuring a desired stroke of a brake pedal upon receiving a brake fluid introduced from a fluid pressure chamber in the master cylinder. The master cylinder is arranged in the form of a plunger-type master cylinder in which cup seals are provided on an inner surface of a bore of the cylinder body. A spring force of a second return spring for a secondary piston is set to be larger than that of a first return spring for a primary piston. A retracted position of the secondary piston is limited by a stopper pin extending through an oblong hole formed in the secondary piston.

REFERENCES:
patent: 4324101 (1982-04-01), Farr
patent: 6192685 (2001-02-01), Bourlon et al.
patent: 6519940 (2003-02-01), Lange et al.
patent: 6796125 (2004-09-01), Kusano et al.
patent: 6808238 (2004-10-01), Drott et al.
patent: 6848257 (2005-02-01), Bacardit et al.

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