Supply passage for brake booster of positive pressure type

Details Supply passage for brake booster of positive pressure type Supply passage for brake booster of positive pressure type

1985-02-14

1987-05-12

Hershkovitz, Abraham

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 92102, F15B 910

Patent

active

046640169

ABSTRACT:
A brake booster of positive pressure type includes a valve mechanism to which a positive pressure such as compressed air from a source located externally of a shell is fed for switching a flow path, through a conduit disposed within a constant pressure chamber disposed forwardly of a power piston and a supply passage which is formed in a valve body. The supply passage according to the invention comprised a radial passage which extends radially outward through the valve body from a shank portion thereof, and an axial passage which communicates with the radial passage, which an opening of the radial passage into the peripheral surface of the valve body being closed by a seal member which may be formed of an elastic material such as rubber. The seal member is covered by part of the power piston. This construction permits the supply passage to be formed in an inexpensive manner as compared with a formation of a supply passage which extends obliquely through the valve body. The power piston reliably prevents the withdrawal of the seal member from the radial passage.

REFERENCES:
patent: 2377699 (1945-06-01), Klimkiewicz
patent: 2520374 (1950-08-01), Rockwell
patent: 2792686 (1957-05-01), Ingres
patent: 3321916 (1967-05-01), Cripe
patent: 3434388 (1969-03-01), Julow et al.
patent: 3789735 (1974-02-01), Tam et al.
patent: 3880049 (1975-04-01), Grabb et al.
patent: 3921501 (1975-11-01), Rosback
patent: 4493243 (1985-01-01), Horibe

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