Device for continous angular adjustment between a camshaft and a

Details Device for continous angular adjustment between a camshaft and a Device for continous angular adjustment between a camshaft and a

1997-06-03

1998-06-16

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

057655170

ABSTRACT:
A device for continuously adjusting an angular orientation of a camshaft relative to a crankshaft of an internal combustion engine, includes a housing, an adjusting piston dividing the housing into two pressure compartments and reciprocating in the housing between two end positions in response to operation of a pressure fluid circuit, and a sliding sleeve connected in one piece to the adjusting piston. The sliding sleeve has a first toothed section in mesh with a drive wheel that is in driving relationship with the crankshaft, and a second toothed section in engagement with a toothed bushing that is securely fixed to the camshaft. The toothed sections are formed as helical gears so that an axial displacement of the adjusting piston effects a relative rotation between the drive wheel and the camshaft. In one end position, which represents a starting phase, with the internal combustion engine being at a standstill, the adjusting piston is subjected to a retention force so as to be securely held in place whereby the retention force can be overcome during the starting phase only after buildup of a sufficient pressure in the respective pressure compartment.

REFERENCES:
patent: 5167206 (1992-12-01), Suga
patent: 5263442 (1993-11-01), Hara
patent: 5535705 (1996-07-01), Eguchi et al.
patent: 5605121 (1997-02-01), Scheidt et al.

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