Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-02-21
1992-05-05
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74866, B60K 4106
Patent
active
051097338
ABSTRACT:
An accumulator back pressure control device for an automatic transmission regulates the accumulator back pressure when a shift valve is switched. For example, when up-shifting from first to second speed, when the second brake starts to engage by switching of a shift valve, the rotational speed of the input is varied to change the output torque of the transmission gear mechanism. By detecting the change in rotational speed with a sensor, a pressure control valve (linear solenoid) is controlled by signals from a control unit so that the control pressure is regulated at a desired time. Thus, for example, the change of hydraulic pressure at a control pressure port regulates the oil source pressure (line pressure) and applies such regulated pressure to the back pressure chamber of an accumulator to change the back pressure of the accumulator. When shifting from second to third speed, the back pressure of another accumulator is similarly controlled, and when shifting from third to fourth speed, the back pressure of still another accumulator is similarly controlled. When down-shifting, the operations are preformed in the same manner as described above.
REFERENCES:
patent: 4709597 (1987-12-01), Yasue et al.
patent: 4722250 (1988-02-01), Sumiya et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4843917 (1989-07-01), Van Selous et al.
patent: 4850251 (1989-07-01), Kuwayama et al.
patent: 4854195 (1989-08-01), Moroto et al.
patent: 4889016 (1989-12-01), Kuwayama et al.
Ishikawa Kazunori
Taga Yutaka
Taniguchi Takuji
Tsukamoto Kazumasa
Aisin Aw Co. Ltd.
Herrmann Allan D.
Levi Benjamin
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Hydraulic control device for an automatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control device for an automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control device for an automatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1404999