Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-10-01
1989-04-04
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, B60K 4116
Patent
active
048174742
ABSTRACT:
The brake B1 is engaged by supply of fluid pressure when the transmission provides the 2nd speed stage, while the brake B2 is engaged by supply of fluid pressure when the transmission provides the 1st speed stage with engine braking. The brakes B1 and B2 should not be co-engaged. A second speed holding valve 216 is provided to conduct therethrough the line pressure transmitted through ports 190 and 194 of the 1-2 shift valve 184 toward the brake B1 when the 2-range detent pressure from the manual valve 46 is not supplied at its port 224 or the 2-range detent pressure is supplied at its port 224 but the L-range detent fluid pressure from the manual valve 46 is also supplied at its port 236 so that its spool 234 is ascended by the spring, and to conduct through the ports 232 and 222when the spool 234 is descended by supply of only the 2-range detent pressure at its port 224, the line pressure transmitted through ports 226 and 228 of the shift valve 220 which supplies fluid pressure to the brake B2 when the L-range detent pressure is supplied at its port 204. Coengagement of the brakes B1 and B2 in L-range due to sticking of the spool 234 at the descended position is avoided by intercepting the supply of fluid pressure to the brake B1 at the ports 226 and 228 which are separated by the spool 212 descended in L-range.
REFERENCES:
patent: 3937108 (1976-02-01), Will
patent: 4307631 (1961-12-01), Iwanaga et al.
patent: 4526065 (1985-07-01), Rosen et al.
patent: 4537095 (1985-08-01), Morizawa
patent: 4539869 (1985-09-01), Suga et al.
patent: 4566355 (1986-01-01), Sugano
Toyota Jidosha & Kabushiki Kaisha
Wright Dirk
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