Machine element or mechanism – Elements – Gear casings
Reexamination Certificate
1998-02-06
2001-03-27
Green, Mary Ann (Department: 3622)
Machine element or mechanism
Elements
Gear casings
Reexamination Certificate
active
06205886
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to control valve devices for automatic transmissions.
One of the conventionally proposed control valve devices for automatic transmissions is known in JP-A 62-288753. This reference shows a structure that a control valve assembly including a valve, etc. for producing a control pressure for automatic shifting is mounted to a transmission casing.
Specifically, a valve body of the control valve assembly is mounted to the transmission casing. An oil strainer is fixed to the control valve assembly. The transmission casing having the control valve assembly arranged therein and an oil pan are connected to each other through a gasket.
With the known control valve device, however, since the transmission casing has a face on which the valve body is fixed inside an outer peripheral face on which the oil pan is fixed, large spaces which allow hand insertion are needed between the valve body of the control valve assembly and the transmission casing to enable mounting and dismounting of the control valve assembly. This results in enlarged size of the transmission casing, and increased number of stages of the valve body due to decrease in a circuit area of the control valve device.
Mounting and dismounting of the control valve assembly can be carried out by holding the oil strainer mounted to the valve body or a pipe. In this case, it is possible to deform the oil strainer to cause air suction, or to disengage the pipe to cause oil leakage.
It is, therefore, an object of the present invention to provide control valve devices for automatic transmissions, which enable easy mounting and dismounting of the control valve assembly even if the spaces are small between the valve body and the transmission casing.
SUMMARY OF THE INVENTION
One aspect of the present invention lies in providing an automatic transmission, comprising:
a casing, said casing having first and second faces, said first face corresponding to an outer peripheral face, said second face being arranged inside said second face; and
a valve assembly producing a control pressure for automatic shifting, said valve assembly including a body mounted to said casing, said body having an outer periphery formed with protrusions which are parallel to said second face of said casing, each protrusion having an extent substantially corresponding to a finger's length.
REFERENCES:
patent: 4842010 (1989-06-01), Edgecomb et al.
patent: 5148720 (1992-09-01), Swenson, Sr. et al.
patent: 5538479 (1996-07-01), Niiyama
patent: 5823071 (1998-10-01), Petrosky et al.
patent: 62-288753 (1987-12-01), None
patent: 5157160 (1993-06-01), None
Foley & Lardner
Green Mary Ann
Jatco Corporation
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