Importance

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Abstract

A hydraulic power transmission joint provided with a rotary valve in which a first enclosing hole is bored and moreover, a first spool valve, a first spring, a first pin member and a first communicating hole are provided. Further, a second communicating hole is also provided therein in such a manner as to be coaxial with the first communication hole. Moreover, a second enclosing hole having a smaller diameter is bored therein. Furthermore, a second spool valve having a diameter smaller than that of the first spool valve, a second spring, a second pin member, a third communicating hole, a fourth communicating hole and an orifice are provided therein. Further, a valve element, whose position is controlled, is enclosed in a high-pressure chamber formed in the rotary valve. Additionally, a gap between a pin portion of the pin member for holding the valve element and a communicating hole, which provides communication from the high-pressure chamber to the enclosing hole for enclosing the pin member, is used as the orifice for generating fluid resistance. The orifice is communicates with the high-pressure chamber and is formed in a second-pin-member-side portion of the second enclosing hole; and an orifice which is provided between the third and fourth communicating holes and is adapted to be closed by a movement of the second spool valve and to generate fluid resistance by a flow of discharge oil caused by driving the plungers.

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First Claim