Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-08-02
1991-07-23
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, B60K 4106
Patent
active
050333313
ABSTRACT:
For an automatic transmission for a vehicle including a speed stage shifting device such as shown in FIG. 1 in which the clutch C.sub.1 is adapted to be engaged when the 2nd speed stage and the 3rd speed stage are set up and disengaged when the 4th speed stage is set up, the engagement of the clutch C.sub.1 being essential for setting up the 2nd speed stage while the engagement of the clutch C.sub.1 is not essential for setting up the 3rd speed stage unless engine brake availability is required, a hydraulic control device includes a first passage 235 and a second passage 329 for supplying a hydraulic pressure to the clutch C.sub.1 in parallel with one another, the first passage having a substantially less fluid flow resistance than the second passage, and a fluid flow switching over mechanism including a 1-2 shift valve 210 and a C.sub.1 control valve 300 for alternatively communicating the first or the second passage while interrupting the second or the first passage according to whether the 2nd speed stage or the 3rd speed stage is set up. An accumulator 450 may be provided in the second passage 329. Further, a one way val e 469, or more desirably a parallel connection of the one way valve 469 and an orifice 467 may be provided between the accumulator and the clutch C.sub.1.
REFERENCES:
patent: 3401581 (1968-09-01), Chana
patent: 3631744 (1972-01-01), Blomquist et al.
patent: 4274308 (1981-06-01), Iwanaga et al.
patent: 4722251 (1988-02-01), Sumiya et al.
Funahashi Makoto
Itoh Hiroshi
Takada Mitsuru
Takahashi Tokuyuki
Herrmann Allan D.
Massey Ryan W.
Toyota Jidosha & Kabushiki Kaisha
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