Nissan Motor Company Limited

Takashi Okubo

Toji Takemura

Tooji Takemura

A rotational speed differential responsive type control coupling is provided with a device for manually or automatically preventing relative rotation of a drive housing and rotor in order to prevent working oil from being heated up to an excessively high temperature.

Rotational speed differential responsive type control coupling

A rotational speed differential type torque transmitting assembly includes a rotor rotatably disposed in a drive housing. During rotational speed differential between the rotor and drive housing, hydraulic fluid is discharged out of variable volume chamber on discharge stroke of the associated piston. Orifices are provided to restrict flow of hydraulic fluid discharged, inducing a pressure rise and adiabatic compression of the hydraulic fluid, causing heat build-up in the rotor. In order to prevent excessive rise in temperature of the assembly, a temperature responsive type spool valve is provided to close the orifice means in response to temperature rise of the hydraulic fluid in the rotor.

Rotational speed differential responsive type joint

A limited slip differential is disclosed which includes a first rotary element, a second rotary element, and hydraulic means including a plurality of reciprocal pistons in slidable engagement with internal cam surface means of the first rotary element. The hydraulic means include an accumulator and fluid passage means in fluid communication with the accumulator and each of pressure chambers defined by the pistons. A pressure relief valve is provided in the accumulator chamber to prevent excessive increase in hydraulic fluid pressure in the hydraulic means.

Rotational speed differential responsive type torque transmitting

A torque transmitting assembly in the form of a rotational speed differential responsive type joint is disclosed. It comprises a drive housing as a first rotary member and a rotor as a second rotary member. The second rotary member is disposed in the first rotary member. A hydraulic fluid arrangement transmits at least a portion of the input torque from one of the first and second rotary members to the other in response to a rotational speed of the second rotary member and also to a rotational speed differential occurring between the first and second rotary members. Specifically, it includes an internal cam surface formed on the first rotary member and surrounding the second rotary member, cam followers in radially outwardly opening bores formed in the second rotary member in slidable engagement with the cam surface and reciprocable in response to the rotational speed differential to define variable volume chambers in the associated radially outwardly opening bores, respectively, and a flow restricter for restricting flow of hydraulic fluid discharged from each of the associated one of the cam followers. The cam surface is contoured such that at any angular position of the second rotary member relative to the first rotary member, substantially the same ratio of the input torque is transmitted from one of the first and second rotary members to the other during the occurrence of the rotational speed differential.

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Zama, Japan

Takashi Okubo