Brake booster with dual rate assist

Details Brake booster with dual rate assist Brake booster with dual rate assist

2011-04-26

2011-04-26

Lazo, Thomas E (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S369100

Reexamination Certificate

active

07930969

ABSTRACT:
A boosted brake having a booster with a decompression arrangement wherein an output push rod has a head with a plurality of openings that extend into a stem and create a plurality of arcuate grooves. The openings receive a plurality of projections that extend from a piston retained in a sleeve held in a movable partition. A spring acts on the projections and urges the piston into engagement with a reaction disc through which an actuation force is supplied a master cylinder. A predetermined reaction force from the master cylinder acts on piston and overcomes the spring to allow the reaction disc to expand and thereby modify the reaction force. The arcuate grooves in the stem allow for a maximum diameter for spring with a minimum diameter for stem that corresponds to a diameter of piston in order to creates a desired braking in response to an emergency brake application.

REFERENCES:
patent: 5012723 (1991-05-01), Gauthier
patent: 6494125 (2002-12-01), Hannus et al.
patent: 6802240 (2004-10-01), Kobayashi
patent: 7100997 (2006-09-01), Berthomieu et al.
patent: 2006/0112819 (2006-06-01), Tsubouchi
patent: 1538050 (2005-06-01), None
patent: 2850343 (2004-07-01), None
patent: 2857641 (2005-01-01), None
International search report in corresponding PCT application (i.e. PCT/US2009/052106), mailed Oct. 15, 2009 (4 pages).

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