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AssigneeAisin Aw Co., Ltd.
InventorsMasahiko Ando, Hideyuki Aoki, Hiroyuki Tsukamoto, Akira Fukatsu, Atsushi Mori, Akira Matsuo, Hideaki Furuta
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A hydraulic power transmission is provided with a frictional engagement element as a lock-up clutch between a hydraulic power transmission chamber, housing a pump impeller and a turbine runner, and a servo oil chamber of the lock-up clutch. A lock-up oil passage that supplies lock-up hydraulic pressure to the servo oil chamber is connected to a hydraulic pressure supply circuit that is used in common with a circulation oil passage that supplies hydraulic pressure for circulation to the hydraulic power transmission chamber. An orifice is disposed in the circulation oil passage. It is thus possible to perform lock-up with different supply pressures. A common oil supply for the lock-up oil passage and the circulation oil passage is provided, for example, by disposing a converting circuit that adapts an oil passage connection to hydraulic transmissions with different types of lock-up clutches.
A hydraulic circuit of a hydraulic power transmission having a pump impeller, a turbine runner, a lock-up clutch and a hydraulic power transmission chamber R1 housing the pump impeller and the turbine runner, said hydraulic circuit comprising:
A hydraulic control unit for a hydraulic power transmission provided with a lock-up clutch, said hydraulic control unit comprising:
Dependencies are inferred from the claim text.