Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1985-03-25
1988-01-19
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, B60K 4110
Patent
active
047198222
ABSTRACT:
A hydraulic pressure control apparatus wherein a first shift valve controls a speed change between a first speed stage and a second speed stage higher than the first speed stage. A second shift valve controls a speed change between the second speed stage and a third speed stage higher than the second speed stage in accordance with the throttle pressure and the governor pressure. In the third speed stage, the line pressure is supplied to an engaging device for the third speed stage and a control port through the first and second shift valves. The line pressure supplied to the control port counterbalances a spring force opposed to the governor pressure in the second shift valve. In a 2-range, the line pressure supplied to the control port counterbalances the compensating pressure related to an intake throttle position. In the 2-range, the line pressure is supplied to an engaging device for the second speed through an L-range shift valve, a second speed holding valve and the second shift valve. The L-range shift valve has two positions. In one position it permits the line pressure to be transmitted to the second speed holding valve. In the other position, it inhibits the line pressure from being transmitted to the second speed holding valve and transmits the line pressure to an engaging device for the L-range. When an intake throttle valve is almost fully closed at an up-shift, a control mechanism increases the rate of discharge of a hydraulic medium from a lower-speed-state engaging device.
REFERENCES:
patent: 4446759 (1984-05-01), McCrary
patent: 4455892 (1984-06-01), Sakakibara
patent: 4509391 (1985-04-01), Sumiya et al.
patent: 4512212 (1985-04-01), Ishikawa
patent: 4526065 (1985-07-01), Rosen et al.
patent: 4537095 (1985-08-01), Morisawa
patent: 4539869 (1985-09-01), Suga et al.
patent: 4555964 (1985-12-01), Sugano
patent: 4566355 (1986-01-01), Sugano
patent: 4579020 (1986-04-01), Sugano
Braun Leslie
Rolnicki Joseph M.
Toyota Jidosha & Kabushiki Kaisha
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