Mold structure for transmission housing and transmission housing

Abstract

A casting mold structure for a transmission housing and a transmission housing in which a pump chamber of an electric oil pump can be integrally cast with the housing in a space near a differential device of a hydraulic control valve at the lower part of the transmission housing. The molded structure for a transmission case is provided with: a transmission mechanism accommodating portion that accommodates a transmission mechanism of a continuously variable transmission; and a differential device that is adjacent to each shaft of the transmission mechanism and has an output shaft parallel to these axes and is stored from the outside with respect to the transmission mechanism. The differential device accommodating portion is arranged to be offset toward one end side in the axial direction; the valve unit mounting portion is arranged in the lower part of the housing when mounted in a vehicle, and is formed outside the outer surface of the differential device accommodating portion by being offset. A cylindrical electric oil pump chamber is provided in the recess, which is disposed under the output shaft close to the valve unit mounting portion with its axis oriented in a direction intersecting the axial direction. The joint portion of the two molds forms a groove for casting axial ribs extending in the axial direction on the outer peripheral surface.

Description

technical field [0001] The present invention relates to a casting mold structure for casting a transmission housing equipped on an automobile to mount an electric oil pump, and the transmission housing. Background technique [0002] In recent years, various technologies have been developed to promote the improvement of the fuel consumption of automobiles. For example, in the case of an idling stop vehicle having a system for stopping the idling operation of the engine when the vehicle is stopped, the improvement of the fuel efficiency can be promoted by stopping the engine. In addition, in the case of a hybrid vehicle that includes an electric motor (motor generator) as a power source in addition to an engine (prime mover), by using an electric motor instead of an engine that is difficult to obtain output torque when starting or running at a low speed, the Using the regenerative brake to recover energy during deceleration can promote the improvement of fuel consumption. ...

AI Technical Summary

Problems solved by technology

[0015] In addition, in the case of the technology of Patent Document 1, since the pump chamber of the electric oil pump 270 and the casing 200 are provided separately, the pump chamber and the casing 200 must be joined, and it is necessary to find a way to prevent oil leakage at the junction and to absorb processing tolerances, etc.

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