Liquid delivery device with blocking clutch

Abstract

A fluid transmitting device includes a side cover connected to a pump impeller and defining a clutch chamber between the side cover and an outer surface of a turbine runner, and a lock-up clutch which includes a clutch piston connected to the turbine runner. The clutch chamber is divided by the clutch piston into an inner oil chamber and an outer oil chamber. In the fluid transmitting device, a dividing means for dividing the inner oil chamber into a primary inner oil chamber section and a secondary inner oil chamber section is provided between the turbine runner and the clutch piston. When a lock-up control device is operated to urge the clutch piston in a clutch switch-on direction, the pressures in the primary inner oil chamber section and the secondary inner oil chamber section are raised in the named order relative to the outer oil chamber. Thus, the connection responsiveness of the lock-up clutch can be enhanced in a simple structure.

Description

technical field [0001] The present invention relates to liquid transfer devices, such as torque converters for use in power transmission systems of vehicles and industrial machines, liquid fittings and the like, and more particularly to liquid transfer devices with lock-up clutches having pump impellers, turbine a rotor, a circulation duct defined between the turbine rotor itself and the pump impeller, a side cover connected to the pump impeller, and a clutch chamber defined between the side cover itself and the outer surface of the turbine rotor so as to communicate with the outer periphery of the circulation duct, And the lock-up clutch, which is arranged in the clutch chamber, and can directly connect the side cover and the turbine rotor with each other; the lock-up clutch has a clutch piston, which is axially movably connected to the turbine rotor, so as to separate the clutch chamber into an inner oil chamber and an outer oil chamber on the side of the side cover, a locko...

AI Technical Summary

Problems solved by technology

This liquid transmission device has the following problems: it requires a one-way valve to be set in the clutch piston so that when the lock-up clutch is released, the working oil can flow from the outer oil chamber to the inner oil chamber, which inevitably leads to an increase in the number of parts and in turn to an increase in cost; moreover, when the pump impeller and the turbine rotor rotate relative to each other in the unconnected state of the lock-up clutch, the sealing elements on the outer periphery of the clutch piston often scratch the inner periphery of the side cover surface, thus it is difficult to ensure the durability of the sealing element

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