Reaction mechanism for booster

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

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Details

92130C, 92130D, F15B 910

Patent

active

061641847

ABSTRACT:
In accordance with the invention, a booster is not provided with a mechanism which transmits a braking reaction, and accordingly, a reaction cannot be transmitted to a brake pedal. On the other hand, a pseudo-reaction imparting means is provided to impart a pseudo-reaction which depends on an amount of depression of the brake pedal. The pseudo-reaction imparting means imparts a pseudo-reaction having a reduced rate of increase to the brake pedal when a travel of the brake pedal is small, and imparts a pseudo-reaction having an increased rate of increase to the brake pedal when a travel of the break pedal is higher. This arrangement avoids the drawback of the prior art that an abnormally high braking reaction is transmitted to a driver as a result of an operational lag of a conventional booster during a quick braking operation. The invention prevents such braking reaction from being transmitted to a driver, but enables a reaction of a required magnitude to be transmitted to the driver by means of pseudo-reaction imparting means. In this manner, a required high braking effort can be obtained with a reduced force of depression during a quick braking operation. The pseudo-reaction imparting means which exhibit such characteristic is capable of realizing an operation feeling, as experienced in a normal operation in the prior art, independently from a quick and a slow braking operation.

REFERENCES:
patent: 1882543 (1932-10-01), Bragg et al.
patent: 1960996 (1934-05-01), Guernsey
patent: 3199298 (1965-08-01), Brown
patent: 3974741 (1976-08-01), Ohmi
patent: 4089252 (1978-05-01), Patel et al.
patent: 4565067 (1986-01-01), Tani et al.
patent: 5337650 (1994-08-01), Uyama

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