Variable camshaft timing system

Details Variable camshaft timing system Variable camshaft timing system

1987-02-24

1988-05-17

Jones, Larry

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

474900, F01L 134

Patent

active

047443383

ABSTRACT:
A variable camshaft timing system for an internal combustion engine varies the relative angular position between the intake camshaft and the exhaust camshaft by controlling the path of the timing belt. First and second idler arms, each having an idler wheel connected thereto, are independently pivoted around a common pivot point by means of a pair of positioning cams operatively connected to an electric stepping motor. The motor is controlled from an electronic control unit which receives signals indicating the engine operating characteristics and through a look-up table steps the positioning cams which in turn pivots the idler arms to rotate the intake camshaft relative to the exhaust camshaft thereby changing the intake valve timing.

REFERENCES:
patent: 3496918 (1970-02-01), Finlay
patent: 3888217 (1975-06-01), Hisserich
patent: 3986484 (1976-10-01), Dyer
patent: 4438737 (1984-03-01), Burandt
patent: 4484543 (1984-11-01), Maxey
patent: 4498431 (1985-02-01), Nakamura
patent: 4517934 (1985-05-01), Papez
patent: 4530318 (1985-07-01), Semple
patent: 4643143 (1987-02-01), Uchiyama

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