Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1988-10-17
1990-06-05
Herrmann, Allan D.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
188 77R, 92 52, 92 62, 475146, 475148, 475285, F16H 344, F16D 5100, F01B 720, F01B 700
Patent
active
049303732
ABSTRACT:
Herein disclosed is a brake system for use with an automatic transmission for braking a rotatable member such as a brake drum, which is accommodated in a casing and connected to the sun gear or the like of a planetary gear mechanism, by bringing a brake band having two ends into contact with the outer circumference with the rotatable member. The brake system comprises: a cylinder tube so held in a predetermined position in the casing as to move forward and backward in the tangential direction of the rotatable member; a piston fitted in the cylinder tube; a piston rod united with the piston and projecting from the cylinder tube such that it is connected to one end of the brake band; an anchor rod so held in a predetermined position in the casing as to move forward and backward in the tangential direction of the rotatable member and conneced to the other end of the brake band; a connecting member for connecting the cylinder tube and the anchor rod so tha they may move together forward and backward; and a valve mechanism disposed in the cylinder tube and adapted to be opened, when the cylinder tube is moved by a force received in a predetermined direction from the brake band through the piston rod to either apply a fluid pressure in a direction to reduce the fastening force by the brake band or release the fluid pressure.
REFERENCES:
patent: 2513192 (1950-06-01), McFarland
patent: 2901888 (1959-09-01), Swift
patent: 2966888 (1961-01-01), Jania et al.
patent: 3353637 (1967-11-01), Chana
patent: 3540558 (1970-11-01), Lamburn
patent: 4388986 (1983-06-01), Umezawa
patent: 4601233 (1986-07-01), Sugano
patent: 4773300 (1988-09-01), Klatt et al.
Asada Toshiyuki
Nakawaki Yasunori
Numazawa Akio
Ushijima Fumihiro
Campbell Chris
Herrmann Allan D.
Toyota Jidosha & Kabushiki Kaisha
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