Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment
Patent
1991-02-11
1992-07-07
Look, Edward K.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Having motor-operated adjustment
92 131, 92 137, 92 51, 92 53, 91415, 188 719, 188196F, F01B 902
Patent
active
051273152
ABSTRACT:
A brake motor subassembly comprises a control piston (10) having an internal cavity delimited by a base wall (18) and, at the periphery, by a stepped bore (20, 22, 24) and having a mechanical actuating device acting on the control piston via an automatic compensation device formed by a screw-nut device (34) stressed towards the base wall, via a washer (26) and an axial thrust ball bearing (32), by a resilient member (28) supported on a ring (30) fixed at the end of the control piston axially opposite the base wall, and a pilot piston (44) having a first cylindrical peripheral surface of larger diameter (46) sealingly slideably cooperating with an end of reduced diameter (20) of the stepped bore and, in the vicinity of its end (50) axially opposite to the first peripheral surface (46) and cooperating with the washer (26), a second peripheral surface of reduced diameter (54) sealingly slideably cooperating with an annular seal (38) associated with a retaining washer (40) resting axially against a shoulder (42) extending radially towards the interior between the end portion of smaller diameter (20) and the intermediate portion (22) of the stepped bore in which the annular seal (38) is mounted, the pilot piston (44) being stressed towards the base wall (18) by the resilient member (28) via the washer (26). A mechanism is provided for adjusting the stress exerted by the resilient member (28) on the pilot piston (44) to a predetermined value.
REFERENCES:
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patent: 4167989 (1979-09-01), Meyer
patent: 4246985 (1981-01-01), Shimizu et al.
patent: 4691809 (1987-09-01), Le Marchand et al.
patent: 4744286 (1988-05-01), Gerard
Gerard Jean-Louis
Le Deit Gerard
Bendix Europe Services Techniques
Decker Ken C.
Look Edward K.
Mattingly Todd
Palguta Larry J.
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