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US 5,454,351 AGranted
Engine piston
OwnerYiding Cao, Qian Wanginventors
Life of this patent
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OwnerYiding Cao, Qian Wanginventors
Estimating the term…
Described herein is an engine piston that incorporates reciprocating heat pipes for temperature reduction in the upper section of the piston. The reciprocating heat pipes are arranged circumferentially, close to the piston ring grooves, and extend from the region of the top ring groove to the piston skirt region. Since the reciprocating heat pipe has a very high thermal conductance, excessive heat in the top ring groove region can be transferred to the heat pipe section corresponding to the piston skirt region, where accessibility to the cooling oil is much greater, and heat can be dissipated via oil splash/mist or jet impingement cooling. Also, the heat dissipation area in contact with the cooling oil is significantly increased. As a result, the temperature in the upper section of the piston can be considerably decreased. The temperature reduction in the upper section of the piston, including the top ring groove region, would significantly improve engine thermal efficiency and performance of the piston assembly.
An engine piston comprising an upper section including at least one piston groove with a sealing ring, a lower section including a piston skirt and a wrist pin joint, at least one elongate heat pipe having an evaporator section imbedded in said upper section adjacent said groove and a condenser section proximate said lower section but spaced from said skirt, whereby said condenser section is adapted to be cooled by engine sprayed engine oil.
Dependencies are inferred from the claim text.