Torque converter equipped with lock-up mechanism

Abstract

A torque converter TC is constituted having an impeller , a turbine , a stator , a converter cover , which covers the back side of the turbine, and is connected to the impeller, and a lock-up mechanism, which couples and uncouples the impeller and turbine. The lock-up mechanism comprises a lock-up piston , which is arranged by being linked to the turbine inside a space enclosed by the converter cover , and lock-up is performed by the lock-up piston mating under pressure to the inner surface of the converter cover due to oil pressure inside a lock-up fastening chamber , which is enclosed by the lock-up piston and the back side of the turbine in a space enclosed by the converter cover. In the outer shell of the turbine , there are formed a deceleration communication-hole , and a slow acceleration communication-hole , which open facing flows of hydraulic fluid generated inside the turbine at the time of deceleration and slow acceleration, and link together the inside of the turbine and the lock-up fastening chamber.