Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1995-06-22
1997-12-30
Oberleitner, Robert
Brakes
Wheel
Axially movable brake element or housing therefor
188 724, 192 85AA, 92151, F16D 250638
Patent
active
057019762
ABSTRACT:
In a hydraulic brake for a transmission, an assist piston, a reaction piston and a main piston are accommodated on a cylinder. The assist piston has a first acting portion in abutment against the main piston, and the main piston has a second acting portion facing one end of stacked frictional engaging elements. The assist piston and the main piston are moved rightwardly by a hydraulic pressure supplied to a first oil chamber and a second oil chamber to bring the frictional engaging elements into engagement with one another. The first and second acting portions are superposed as viewed axially, thereby preventing a jarring of the assist piston and the main piston. In one embodiment, each of the pistons is formed from a pressed article, whereby the machining cost can be reduced and, moreover, oil passages connecting the first and second oil chambers can be provided in a simple manner.
REFERENCES:
patent: 2901888 (1959-09-01), Swift
patent: 3480115 (1969-11-01), Lallemant
patent: 3547233 (1970-12-01), Girvan
patent: 3599512 (1971-08-01), Wayman
patent: 3650364 (1972-03-01), Laing
patent: 4560034 (1985-12-01), Windish et al.
patent: 4753136 (1988-06-01), Hayakawa et al.
patent: 5511644 (1996-04-01), Murata
Kodama Yoshihiro
Kojima Yoichi
Kumagai Yorinori
Terao Kiminobu
Honda Giken Kogyo Kabushiki Kaisha
Oberleitner Robert
Schwartz Chris
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