Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1988-08-18
1989-06-27
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 123 9017, 74395, 464 2, 474900, F01L 134
Patent
active
048419249
ABSTRACT:
A device (10) for varying the angular phase relation between a camshaft (12) and a crankshaft (unshown) in response to axial displacement of an advancing plate (20) drivingly connected to a support (16) via straight splines (16f) and a drive (18) via angled splines (18d). The support (16) is fixed to an end (12a) of the camshaft (12) for rotation therewith. The drive (18) is journaled on the support (16) and is driven by and in phase with the crankshaft. The advancing plate (20) is also threadably connected to a drum (36) via threads (20c,36a) and the axial displacement is effected by relative rotation between the plate (20) and the drum (36). A clockspring (24) reacting between the support (16) and drum (36) tends to rotate the drum (36) faster than the plate (20) for positioning the plate (20) in a first limit position. The plate ( 20) is selectively movable from the first position toward a second limit position in response to selective application of a frictional retarding force to the drum by an actuation assembly (30). Intermediate plate positions (and of course intermediate phase relations of the camshaft (12) and crankshaft) are provided by balancing the spring and retarding forces. Further, the device contains an internal supply of lubricating oil sealed against leakage by covers (26,28) disposed at the axially facing ends of the device.
REFERENCES:
patent: 3626720 (1971-12-01), Meacham et al.
patent: 4305352 (1981-12-01), Oshima et al.
patent: 4498431 (1985-02-01), Nakamura et al.
patent: 4561390 (1985-12-01), Nakamura et al.
patent: 4754727 (1988-07-01), Hampton
Hampton Keith
Krzysik Don J.
Lilley Glen R.
Eaton Corporation
Lo Weilun
Rulon P. S.
Wolfe Willis R.
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