Variable valve timing apparatus

Details Variable valve timing apparatus Variable valve timing apparatus

1992-04-23

1993-05-11

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, 74568R, F01L 134

Patent

active

052091945

ABSTRACT:
An apparatus for controlling a valve timing in an internal combustion engine. A timing piston 7 is in splined engagement with both a camshaft sleeve connected to the camshaft 1 and a pulley sleeve connected to the timing pulley. The timing piston 7 is connected, via a ball bearing unit 8, to a screw nut 9 of a ball screw mechanism. The bearing unit 8 is connected to the nut 9, with a clearance C. A disk spring 20, via a spacer 21, urges the inner race 8a of the bearing 8 so that it abuts against a washer 23 an a snap ring 22 on the screw shaft 9. As a result, the screw shaft 9 is connected to the timing piston 7 so that the axial movement from the shaft 9 is transmitted to the piston 7, while the piston 7 is rotating on the shaft 9, and a slight radial relative movement is allowed between the screw shaft 9 and the piston 7 without generating any play in the axial movement. An oil passageway is formed for lubricating the ball nut mechanism.

REFERENCES:
patent: 4305352 (1981-12-01), Oshima et al.
patent: 4463712 (1984-08-01), Stojek et al.
patent: 4976229 (1990-12-01), Charles
patent: 4986801 (1991-01-01), Ohlendorf et al.

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