Oil pressure control means for an automatic transmission

Details Oil pressure control means for an automatic transmission Oil pressure control means for an automatic transmission

1977-04-27

1978-12-12

Wyche, Benjamin W.

Machine element or mechanism

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

Preselected indexed position

B60K 4110

Patent

active

041290518

ABSTRACT:
An oil pressure control means for an automatic transmission including an overdrive means of a planetary gear type having a plurality of friction engaging means and a one-way clutch and adapted to allow the output shaft thereof to run over the input shaft thereof due to the disengagement of the one-way clutch in the reversed rotational direction thereof when one of the friction engaging means arranged in parallel to the one-way clutch is disengaged, wherein an oil pressure change over means is included which drains the oil pressure for the aforementioned one friction engaging means of the overdrive means when the downshifting of the transmission is effected, thereby allowing the output shaft of the overdrive means to run over the input shaft thereof so that the occurrence of the engine braking is avoided.

REFERENCES:
patent: 3951011 (1976-04-01), Lemon
patent: 4056991 (1977-11-01), Kagenori et al.

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