Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-09-06
1991-07-02
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74867, B60K 4106
Patent
active
050276760
ABSTRACT:
An automatic transmission has a transmission gear mechanism and a plurality of friction coupling members which are applied or released by hydraulic pressures applied thereto under the control of a hydraulic control system. The control system includes a hydraulic control circuit which controls the hydraulic pressure fed to or discharged from the respective friction coupling member, thereby changing the condition of application of the friction coupling members and causing the automatic transmission to shift. The plurality of friction coupling members includes first and second friction coupling members the conditions of application of which are changed during gear shifting from a first predetermined gear speed to a second predetermined gear speed. The first and second friction coupling members are fed with the hydraulic pressure respectively through first and second hydraulic passages. The hydraulic control circuit is provided with a pressure regulator valve which receives the pressure in the first hydraulic passage as a pilot pressure and regulates the hydraulic pressure to be fed to the second friction coupling member through the second hydraulic passage according to the pilot pressure.
REFERENCES:
patent: 3823621 (1974-07-01), Kubo et al.
patent: 3938409 (1976-02-01), Uozumi
patent: 4560045 (1985-12-01), Walsh
patent: 4631982 (1986-12-01), Miki et al.
patent: 4655774 (1987-05-01), Oguri
patent: 4706523 (1987-11-01), Nishikawa
Fujiwara Takuji
Ishii Kozo
Takemoto Kazuo
Yoshimura Hiroshi
Herrmann Allan D.
Massey Ryan
Mazda Motor Corporation
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