Variable compression control arrangement for internal combustion

Details Variable compression control arrangement for internal combustion Variable compression control arrangement for internal combustion

1987-10-06

1989-03-07

Wolfe, Willis R.

Internal-combustion engines

Four-cycle

Variable clearance

123 48B, F02B 7504, F02D 1502

Patent

active

048096504

ABSTRACT:
To induce high compression engine operation hydraulic fluid is fed into a variable volume chamber defined between an outer piston and an inner one which is reciprocatively disposed therein via a supply passage which includes a one-way valve. When low compression engine operation is required the pressure supplied to a valve chamber in which a spool valve is disposed is increased to the point whereat the spool valve moves to a position wherein the supply passage is closed and a drain and transfer passages are opened. The drain passage leads directly to the cylinder bore so as to enable the hydraulic fluid in the variable volume chamber to be vented unrestrictedly. The transfer passage permits a small amount of hydraulic fluid to flow through the variable volume chamber to the drain passage in a manner which cools the same and prevents degradation of the hydraulic fluid retained in the one-way valve and the like.

REFERENCES:
patent: 3450112 (1969-06-01), Bachle
patent: 3704695 (1972-12-01), Cronstedt
patent: 4342291 (1982-08-01), Lewis
patent: 4469055 (1984-09-01), Caswell

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