Crankcase breather and lubrication oil system for an internal co

Details Crankcase breather and lubrication oil system for an internal co Crankcase breather and lubrication oil system for an internal co

1989-07-12

1990-05-22

Cross, E. Rollins

Internal-combustion engines

Lubricators

Crankcase, pressure control

123 4186, 184 618, F01M 100

Patent

active

049268147

ABSTRACT:
An internal combustion engine having a vertically oriented crankshaft and a horizontally oriented cylinder bore and including a plurality of lubrication sites to be pressure lubricated. A first upstanding wall extends upwardly from the top wall of the crankcase and circumscribes and defines a first chamber. A breather passage communicates crankcase gases from the crankcase into the first chamber. A drain passage communicates oil separated from the crankcase gases in the first chamber into the cylinder bore below the piston and is positioned along the cylinder bore so as to be periodically occluded by the piston during reciprocation thereof. A second upstanding wall extends upwardly from the top wall of the crankcase in spaced relationship to at least a portion of the first wall, and defined together with the first wall a second chamber therebetween. A first oil passage communicates oil from a lubricant pump to the second chamber, and a second oil passage communicates oil from the second chamber to at least one of the lubrication sites.

REFERENCES:
patent: 2607332 (1952-08-01), Bosma
patent: 3096850 (1963-07-01), Rosenqvist
patent: 3195526 (1965-07-01), Jordan
patent: 4470389 (1984-09-01), Mitadera et al.
patent: 4549520 (1985-10-01), Tamba et al.
patent: 4688529 (1987-08-01), Mitadera et al.
patent: 4727834 (1988-03-01), Isaka et al.

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