Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1991-12-16
1993-03-30
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 474110, 474111, F01L 134, F01L 104
Patent
active
051974207
ABSTRACT:
A camshaft adjuster mounted between a taut strand and a slack strand of a chain connecting an intake camshaft to an exhaust camshaft has two tensioning shoes which are urged by a spring away from each other and against the inner sides of the chain strands. One tensioning shoe is mounted on a reciprocable piston within which a plunger carrying the other tensioning shoe is slidable against the force of the spring. The piston is moved against the taut strand by pressurization of a pressure chamber through a nonreturn valve and the plunger is moved with the piston so that the taut and slack strands are moved together and compression of the tensioning spring is thereby maintained relatively constant. A damping chamber may be provided with throttling bores in the piston and/or plunger to control the damping effect.
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Porsche 968, Automotive Engineering, Nov. 1991, pp. 73-74.
Arnold Gerd
Lienkamp Markus
Schweikard Albert
Cross E. Rollins
General Motors Corporation
Lo Weilun
Outland Robert J.
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