Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1992-10-22
1993-08-03
Lorence, Richard M.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74867, B60K 4106
Patent
active
052318982
ABSTRACT:
In a configuration in which electronically operated pressure control valves (31-36) are respectively connected to clutches of a two-stage transmission (3) composed of main transmissions (1st, 2nd, R, 4th, 3rd) and sub transmissions (L, H), when a downshift is effected from a present speed stage to a next speed stage with power on, the supply of oil pressure to a speed-changing clutch for the present speed stage is stopped on the basis of a speed-change command, the pressure control valve is actuated when a relative number of revolutions of the speed-changing clutch for the next speed stage becomes zero, which commences the supply of oil pressure to that speed-changing clutch, and the supply of oil pressure is gradually increased upon confirming the completion of a filling time of the speed-changing clutch. Thus discomfort owing to a speed-change shock is prevented in whatever state the amount of an accelerator operated and the state of operation of a brake are.
In addition, in a downshift accompanying the operation of clutches of both transmissions, torque off time is not provided for the sub transmission clutch, and the supply of oil pressure to a next stage clutch is commenced immediately so as to supply oil pressure at a gradually increasing rate. After engagement of the clutch, the supply of oil pressure to the main transmission clutch at a gradually increasing rate is effected upon completion of the filling time, thereby preventing discomfort attributable to a speed-change shock.
REFERENCES:
patent: 4690017 (1987-09-01), Taniguchi et al.
patent: 4707789 (1987-11-01), Downs et al.
patent: 4757449 (1988-07-01), Kurihara et al.
patent: 4951200 (1990-08-01), Leising et al.
Kabushiki Kaisha Komatsu Seisakusho
Levi Benjamin
Lorence Richard M.
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