Shift control system for engine braking in an auxiliary transmis

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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475282, D16H 6104

Patent

active

050164961

ABSTRACT:
A shift control system for an automatic transmission comprises a shift valve for an auxiliary gear train, an orifice bypass passage and an accumulator for low gear train. The shift valve includes a spool which is movable between a first position where the hydraulic fluid is supplied to a first passage and hydraulic fluid is discharged from a second passage, and a second position where the hydraulic fluid is supplied to the second passage and hydraulic fluid is discharged from the first passage. The orifice bypass valve includes a spool and a pilot port. The former is movable between an interrupting position where the first passage is interrupted from a third passage, and a connecting position where the first passage is connected to the third passage, and it is pressed to the interrupting position by a spring. The latter is connected with a fourth passage or engine brake passage.

REFERENCES:
patent: 2770151 (1956-11-01), Cartwright et al.
patent: 2894415 (1959-07-01), Miller
patent: 2911853 (1959-11-01), Sand
patent: 2929271 (1960-03-01), Miller
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4765202 (1988-08-01), Hayasaki
Service Manula of Toyota Supra, Feb. 1986.

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