Title:
【発明の名称】自動変速機における油圧制御装置
Document Type and Number:
Japanese Patent JP3103568
Kind Code:
B2
Abstract:
A hydraulic controller for an automatic transmission, having a band brake having a large stopping force based on a self-boosting effect against rotation in a self-binding direction and having a comparatively small stopping force against rotation in the unbinding direction, a modulator valve for producing a modulator pressure by reducing a line pressure, a band brake hydraulic servo having a brake engaging hydraulic chamber and a brake releasing hydraulic chamber. A line pressure is supplied to the band brake hydraulic servo to stop rotation in the self binding direction when a predetermined transmission speed is selected. The line pressure is also supplied the band brake hydraulic servo to stop rotation in the unbinding direction when another transmission speed is selected. A modulator pressure is supplied to the brake engaging hydraulic chamber to stop the rotation in the self-binding direction of the band brake and to allow the rotation in the unbinding direction when an intermediate speed is selected. The risk of any shift from the predetermined speed to another speed via the intermediate speed is eliminated, thereby enabling the transmission to be shifted always correctly while reducing shift shocks.
Inventors:
Yoshinari Kuwayama
Masahiko Ando
Youichi Hayakawa
Masahiko Ando
Youichi Hayakawa
Application Number:
JP16751689A
Publication Date:
October 30, 2000
Filing Date:
June 29, 1989
Export Citation:
Assignee:
Aisin AW Co., Ltd.
International Classes:
F16H61/00; F16H61/04; F16H61/06; F16H61/08; F16H61/10; F16H3/66; F16H63/30; (IPC1-7): F16H61/04; F16H3/66; F16H61/00
Domestic Patent References:
| JP1150051A | ||||
| JP135148A | ||||
| JP1229148A | ||||
| JP1242856A |
Attorney, Agent or Firm:
Kazuo Chikajima