Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1983-07-29
1986-01-28
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74878, 74868, B60K 4116, B60K 4106
Patent
active
045663556
ABSTRACT:
A shift valve comprises a spool having a downshift position for establishing a lower speed ratio and an upshift position for establishing a higher speed ratio, a plug, and a spring between the spool and plug. The spool has a pressure acting area which governor pressure acts on, while the plug has a pressure acting area which throttle pressure acts on. At low throttle pressures, the spool moves from the downshift position to the upshift position when a predetermined vehicle speed is attained. At higher throttle pressures, the spool moves between the downshift and upshift position depending upon the governor pressure and throttle pressure. The shift valve has a port formed therein which admits a downshift position hold signal fluid pressure (i.e., line pressure) between the spool and plug so as to hold the spool to the downshift position thereof.
REFERENCES:
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patent: 3572479 (1971-03-01), Kelley
patent: 3685372 (1972-08-01), Miyazaki
patent: 3707891 (1973-01-01), Asano et al.
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patent: 3831465 (1974-08-01), Murakami
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patent: 4349088 (1982-09-01), Ito et al.
European Search Report
Braun Leslie A.
Nissan Motor Co,. Ltd.
Wright Dirk
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