Hydraulic cylinder for braking elements of vehicles

Details Hydraulic cylinder for braking elements of vehicles Hydraulic cylinder for braking elements of vehicles

1990-07-19

1991-10-01

Look, Edward K.

Expansible chamber devices

Piston with rigid axially extending hollow stem

Hollow stem forms axially extending fluid passage

92 13, 92 136, 92 24, 92 27, 92 28, 92107, 92108, F01B 3100

Patent

active

050522779

ABSTRACT:
In an hydraulic cylinder for vehicle braking elements, a clamping piston (1) moved in a housing (3) by hydraulic pressure acts relative to a brake lining carrier bearing a brake lining, e.g., in the form of a brake shoe which, during braking, is forced against the brake disk. To prevent the clamping piston (1) in rest position from being pushed back into its housing (3) by axial impact forces, the clamping piston (1) can be coupled at its interior to an hydraulic volume, which, in the neutral position of the clamping piston (1), acts as an hydraulic cushion and counteracts the impact forces. The hydraulic cushion is formed by an auxiliary piston (17) which defines an hydraulic volume at the interior of clamping piston (1) and which, with the clamping piston in rest position, sealingly abuts the clamping piston and locks the hydraulic volume relative to the pressure chamber (11) of the clamping piston (1), but when the clamping piston (1) is pressurized, produces an unobstructed connection between the pressure chamber (11) and the hydraulic volume within the auxiliary piston (17).

REFERENCES:
patent: 2571963 (1951-10-01), Stelzer
patent: 3470793 (1969-10-01), Hanchen
patent: 3643763 (1972-02-01), Hay
patent: 4068746 (1978-01-01), Munechika

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