Engine lubrication circuit with alternating lubrication paths

Details Engine lubrication circuit with alternating lubrication paths Engine lubrication circuit with alternating lubrication paths

1997-04-24

1998-10-27

Kwon, John T.

Internal-combustion engines

Lubricators

Crankcase, pressure control

123 70D, F01M 100

Patent

active

058265562

ABSTRACT:
A lubrication system for an internal combustion engine directs a dedicated flow of oil to the cylinder bores of an engine. In addition, a more traditional oil circuit is provided to lubricate the components within the crankcase of the engine. A 2-way valve is used to alternate the flow of oil from an oil pump through the two alternative circuits according to a duty cycle that is selected as a function of a pre-selected engine parameter. The engine parameter, in a typical application, is shaft speed or rpm. By directing oil to the cylinder bores at a higher duty cycle when the engine speeds are low, the pistons are adequately lubricated when, otherwise, the low engine speed could cause difficulty in providing a proper flow of lubricant to the cylinder bores.

REFERENCES:
patent: 5287833 (1994-02-01), Yashiro
patent: 5355851 (1994-10-01), Kamiya
patent: 5370089 (1994-12-01), Harada
patent: 5375573 (1994-12-01), Bowman
patent: 5513608 (1996-05-01), Takashima

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