Hydraulic control system in automatic transmission gear for 4 ad

Details Hydraulic control system in automatic transmission gear for 4 ad Hydraulic control system in automatic transmission gear for 4 ad

1982-10-07

1985-09-03

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

045384827

ABSTRACT:
In an automatic transmission system comprising 3 clutches including a 4th speed clutch for achieving the 4th speed of over-drive operated by oil pressure and by connecting an input shaft with a carrier of the ravigneawx type planetary gear set and 2 brakes, it is necessary to engage the 4th speed clutch and one brake in order to obtain the 4th speed of over-drive. On the other hand, the other two clutches must be engaged in order to obtain the 3rd speed. Therefore, timely engagement of one clutch for the 3rd speed having a greater torque transmitting capacity at the time of shifting down from the 4th to the 3rd speed becomes difficult. In order to overcome this disadvantage, a hydraulic control system in an automatic transmission is so constructed that a 3rd speed clutch having a smaller torque transmitting capacity is engaged after one brake for the 4th speed has been released in order to increase the oil pressure which was kept at a lower pressure during shifting with the synchronization of the rotation of two arbitrary rotary elements in the gear shift unit and to supply another clutch having a greater torque transmitting capacity with pressurized oil, thereby achieving smooth shifting without shocks.

REFERENCES:
patent: 3638771 (1972-02-01), Chana
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 3938410 (1976-02-01), Dach et al.
patent: 4325271 (1982-04-01), Iwanaga et al.
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4430910 (1984-02-01), Lemieux et al.

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