Variable valve opening for an internal combustion engine

Details Variable valve opening for an internal combustion engine Variable valve opening for an internal combustion engine

2006-06-27

2006-06-27

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090390, C123S090430, C123S090120

Reexamination Certificate

active

07066123

ABSTRACT:
An intake or exhaust valve for an internal combustion engine has a rocker arm with a pivot between its ends, one end of which is engaged by the pushrod, and the other end engages the valve stem. An adjustable stop has two positions for the rocker arm pivot; a rest position where there is no movement of the pivot, and an upper lock position where the pivot moves in response to the pushrod, and there is a reduction in the opening of the valve. A progressive rate spring compresses as the pivot moves towards the upper lock position, thereby modulating valve opening for relatively slow start (or stop) of valve stroke with accelerating (or decelerating stroke), as the progressive rate spring compresses (or expands). Relatively thinner and thicker Belleville springs are used in series to produce a progressive rate spring. The lock position of the pivot elevated above the rest position is determined by a hydraulic block trapping oil in a closed chamber. One or more intermediate lock positions can be provided by varying the available volume of the closed chamber. An inner sleeve is rotated to obstruct one or more holes for fluid passage and an outer sleeve moves longitudinally to hit hydraulic block when an end passes the highest of such holes.

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