Creeping preventing apparatus in automatic transmission for vehi

Details Creeping preventing apparatus in automatic transmission for vehi Creeping preventing apparatus in automatic transmission for vehi

1983-07-12

1985-12-31

Pate, III, William F.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74866, 74867, 192134, B60K 4116, B60K 4118

Patent

active

045613281

ABSTRACT:
In an automatic transmission for a vehicle comprising at least a first friction engaging unit engaged for attaining a low forward speed and a second friction engaging unit engaged together with the first friction engaging unit for attaining a high forward speed, an apparatus for preventing creeping of the vehicle comprising an electronic control unit responsive to release of an accelerator pedal and the halted state of the vehicle and operative to control shift control means for engaging said friction engaging units and to control fluid pressure control means for reducing the pressure of hydraulic fluid supplied to the second friction engaging unit to a level lower than that of hydraulic fluid supplied to the first friction engaging unit, the second friction engaging unit including a brake band for gripping a drum, one end of the brake band being urged into engagement with the drum by a hydraulic device and located with respect to the fixed other end in a direction that the drum tends to rotate when the high forward speed is attained.

REFERENCES:
patent: 2566518 (1951-09-01), Farkas
patent: 2566519 (1951-09-01), Farkas
patent: 2953940 (1960-09-01), Slemmons
patent: 3438285 (1969-04-01), Hanzi et al.
patent: 3465614 (1969-09-01), Reynolds
patent: 3509784 (1970-05-01), Mahoney
patent: 3561296 (1971-02-01), Iijima
patent: 3733932 (1973-05-01), Uozumi et al.
patent: 3859873 (1975-01-01), Miyanchi et al.

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