Patent ID: 7287630
Filing Date: 2007-10-30
Classification: F16H

Abstract:
1. A torque converter with a lockup clutch for transmitting power by engaging a pump impeller and a turbine runner, comprising: a fluid passage into which flows operation oil supplied from a converter chamber, which is surrounded by the pump impeller and the turbine runner, to a lockup chamber in which engagement and disengagement of the lockup clutch are performed, the fluid passage being connected to an oil drain passage for the operation oil without passing through an engaging portion of the lockup clutch; and a valve provided at a point on the fluid passage to control a flow amount of operation oil, wherein an opening of the valve becomes wide when a difference in pressure between the lockup chamber and the oil drain passage is large, and the opening of the valve narrows when a difference in pressure between the lockup chamber and the oil drain passage is small.