Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-09-19
1997-08-19
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 1344
Patent
active
056577257
ABSTRACT:
A camshaft (126) has a vane (160) secured to an end thereof for non-oscillating rotation therewith. The camshaft (126) also carries a housing (129) which can rotate with the camshaft (126) but which is oscillatable with the camshaft (126). The vane (160) has opposed lobes (160a, 160b) which are received in opposed recesses (131, 132), respectively, of the housing (129). The recesses (131, 132) have greater circumferential extent than the lobes (160a, 160b) to permit the vane (160) and housing (129) to oscillate with respect to one another, and thereby permit the camshaft (126) to change in phase relative to a crankshaft. The camshaft (126) tends to change direction in reaction to engine oil pressure and/or camshaft torque pulses which it experiences during its normal operation, and it is permitted to either advance or retard by selectively blocking or permitting the flow of engine oil through the return lines (101, 102) from the recesses (131, 132) by controlling the position of a spool (300) within a spool valve body (198) in response to a signal indicative of an engine operating condition from an engine control unit (108). The spool (300) is selectively positioned by controlling hydraulic loads on its opposed end in response to a signal from an engine control unit (108). The vane (160) can be biased to an extreme position to provide a counteractive force to a unidirectionally acting frictional torque experienced by the camshaft (126) during rotation.
REFERENCES:
patent: 4771742 (1988-09-01), Nelson et al.
patent: 4787345 (1988-11-01), Thoma
patent: 4854273 (1989-08-01), Uesugi et al.
patent: 4858572 (1989-08-01), Shirai et al.
patent: 4993370 (1991-02-01), Hashiyama et al.
patent: 5002023 (1991-03-01), Butterfield et al.
patent: 5003937 (1991-04-01), Matsumoto et al.
patent: 5046460 (1991-09-01), Butterfield et al.
patent: 5107804 (1992-04-01), Becker et al.
patent: 5172659 (1992-12-01), Butterfield et al.
patent: 5205249 (1993-04-01), Markley et al.
patent: 5367992 (1994-11-01), Butterfield et al.
patent: 5386807 (1995-02-01), Linder
Butterfield Roger P.
Haesloop J. Christian
Borg-Warner Automotive Inc.
Dziegielewski Greg
Lo Weilun
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