Patent ID: 7624660
Filing Date: 2009-12-01
Classification: F16H,Y10T

Abstract:
1. An automatic transmission comprising: a hydraulic pressure supply unit which is disposed, together with a gear train, inside a case and switches a shift state (gear ratio) of the gear train based on a supply of hydraulic pressure from hydraulic fluid; a control unit which is disposed in the case and detachably connected to the hydraulic pressure supply unit, and electrically controls the hydraulic pressure supply unit; and a storage portion which is provided in the case and temporarily stores hydraulic fluid supplied to the gear train, and cools the control unit by the stored hydraulic fluid, wherein the storage portion is provided with a metering valve that discharges hydraulic fluid stored in the storage portion to an oil pan, and the metering valve is a temperature sensitive valve in which an opening amount thereof is adjusted such that less hydraulic fluid is discharged the higher the temperature of the hydraulic fluid in the storage portion.