Hydraulic oil supplying apparatus for automatic transmission
AssigneeJATCO Ltd
InventorMasaya Akiyama
Life of this patent
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Abstract
A drain path extending from a control valve mounted upper an oil pump is designed to make unit sizes small. The drain path is formed using a groove on a joint surface where an oil pump housing is secured to a transmission case. The drain path is formed without any extension around a bearing holding portion for a counter shaft while it overlaps the bearing holding portion as seen in the axial direction. Thus, the whole structure of an automatic transmission can be designed in smaller dimensions. A supply hole is formed in the bearing holding portion so as to allow hydraulic oil drained from the drain path to be delivered to the transmission. The bearing holding portion may be dislocated to another position corresponding to design change for a counter shaft.
Claims8
A hydraulic oil supplying apparatus for an automatic transmission comprising:
- a transmission case having a gear type speed changing mechanism incorporated therein and including a hydraulic control valve for controlling said speed changing mechanism at an upper portion thereof and a bearing holding portion for a counter shaft;
- an oil pump housing secured to said transmission case via a joint surface thereof, said oil pump housing being formed with a central through hole through which an input shaft extends, a gear chamber receiving pump gears therein, a discharge path and a suction path arranged in substantial alignment with each other in the vertical direction, and a substantially arch-shaped first groove extending to a lowermost end of said suction path on said joint surface to constitute a drain path from said control valve, said first groove overlapping said bearing holding portion when it is observed in the direction at a right angle relative to said joint surface;
- and
- a pump cover secured to said oil pump housing to cover said gear chamber therewith.
Dependencies are inferred from the claim text.