Valve driving mechanism for double overhead camshaft engine

Details Valve driving mechanism for double overhead camshaft engine Valve driving mechanism for double overhead camshaft engine

1991-03-27

1993-01-26

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, F01L 134

Patent

active

051814854

ABSTRACT:
A valve driving mechanism for a double overhead camshaft engine includes a camshaft drive mechanism, including a camshaft sprocket for transmitting engine output from a crankshaft of the engine to one of intake and exhaust camshafts. A valve timing varying mechanism is driven so as to vary a valve timing of, for example, a set of intake valves relative to a valve timing of a set of exhaust valves. The valve timing varying mechanism includes a first helical gear, mounted on the exhaust camshaft for rotation, a second helical gear, in mesh with the first helical gear, which is rigidly secured to the intake camshaft, and a cylindrical sliding element, mounted on the exhaust camshaft for axial displacement. The cylindrical sliding element operationally couples the exhaust camshaft to the camshaft drive mechanism so as to cause a relative rotational displacement therebetween when the cylindrical sliding element undergoes axial displacement with respect to the exhaust camshaft.

REFERENCES:
patent: 4535731 (1985-08-01), Banfi
patent: 4674452 (1987-06-01), Asanomi
patent: 4993370 (1991-02-01), Hashiyama et al.
patent: 5012773 (1991-05-01), Akasaka et al.
patent: 5012774 (1991-05-01), Strauber et al.

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