Piston cooling device for internal combustion engine

Details Piston cooling device for internal combustion engine Piston cooling device for internal combustion engine

1991-04-17

1992-12-29

Kamen, Noah P.

Internal-combustion engines

Cooling

Internal cooling of moving parts; e.g., hollow valves,...

F01P 104

Patent

active

051742497

ABSTRACT:
A piston cooling device for internal combustion engines is disclosed. Lubricating oil discharged from an oil pump is led through an inlet provided on an external peripheral surface of a main journal into a first oil passage and is further delivered to an outlet provided on the opposite side of the crankshaft as the inlet. A crank pin is rotatably received by an end portion of a connecting rod, having a bearing surface interposed therebetween. A clearance is provided between the bearing surface and the crank pin. A second oil passage is provided at the connecting rod, communicating with the clearance. A port formed on the bearing surface makes the first oil passage communicate with the clearance and with the second oil passage when a crank angle comes to a range of between 0 and 90 degrees before a piston dead center position or when the inertia load applied to between the end portion of the connecting rod and the crank pin becomes is minimized. This arrangement delivers lubricating oil to the clearance to form an oil film that provides good lubrication. Additionally oil is sprayed from the second oil passage to cool the piston.

REFERENCES:
patent: 2142175 (1939-01-01), Buttner
patent: 2236401 (1941-03-01), Gehres
patent: 2362158 (1944-11-01), Ricardo
patent: 2428602 (1947-10-01), Yingling
patent: 2449657 (1948-09-01), Kishline
patent: 4398507 (1983-08-01), Belsanti
Nissan Technical Review, May 25, 1989, Nissan Motor Co., Ltd. (w. translation of summary on p. 49).

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