Booster

Details Booster Booster

1993-05-25

1994-08-02

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

92 48, 92 96, F15B 910

Patent

active

053335341

ABSTRACT:
A brake booster, and more particularly, an improvement of a coiled spring which is disposed within a valve body to return an input shaft to its inoperative position is disclosed. The coiled spring of the invention is generally cylindrical, and is disposed between a retainer secured to a tubular portion of the valve body and a step on the input shaft. The coiled spring includes a seat section which is disposed in abutment against the step on the input shaft and which has an inner diameter chosen to be less than the adjacent coil. Such arrangement enables an arcuate space 20d to be maintained radially between the seat section and its adjacent coil. The arcuate space is utilized as a pressure passage which allows the passage of the atmosphere. If the coiled spring is rapidly compressed upon operation of the booster, the described space is maintained, allowing an unhindered passage of the atmosphere through the space. This improves the response upon operation of the booster.

REFERENCES:
patent: 3387540 (1968-06-01), Wilson
patent: 4784249 (1988-11-01), Harrison
patent: 5105721 (1992-04-01), Furuta et al.
patent: 5121674 (1992-06-01), Uyama
patent: 5146837 (1992-09-01), Inoue

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