Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1990-09-10
1992-03-31
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9016, 123 9017, 123 9024, 123 906, 251263, 251254, 2512495, 74 56, 74425, 74568R, F01L 130, F01L 134, F01L 146
Patent
active
050998056
ABSTRACT:
A variable valve actuating device and method are disclosed, the device including a rotatable cam having a selectively configured cam face engagable with a worm drive at an outer engaging surface of the cam, the worm drive being configured for both rotary and axial movement, rotary movement imparting rotational motion to the cam face, and axial movement changing relative valve timing. The device preferably includes a plurality of such rotatable cams engagable with different ones of a plurality of worm drives to thus provide selective variation of valve opening and valve closing times independently of one another, with open-valve duration being variable to occur at any point in an overall operating cycle of the system.
REFERENCES:
patent: 1378318 (1921-05-01), Brewer
patent: 3234923 (1966-02-01), Fleck et al.
patent: 3424139 (1969-01-01), Brooks
patent: 4256065 (1981-03-01), Hirt
patent: 4777915 (1988-10-01), Bonvallet
"Continuous Camlobe Phasing", Jun. 1987, Automotive Engineering.
"Computer valvetrain may hike power, mpg", Nov. 20, 1989, Automotive News.
SAE Technical Papers Series No. 880386, "A Review of Variable Engine Valve Timing" by C. Gray, May 1988.
SAE Technical Papers Series No. 880387 "The Synthesis and Analysis of Variable-Valve-Timing Mechanisms for Internal-Combustion Engines", F. Freudenstein.
SAE Technical Papers Series No. 880390 "Effect of Variable Engine Valve Timing on Fuel Economy" by T. H. Ma, May 1988.
SAE Technical Papers Series No. 880388 "Variable Valve Timing-A Possibility to Control Engine Load without Throttle" by Lenz, Wichart and Gruden, Jun. 1988.
"A survey of variable valve actuation", Jan. 1990, Automotive Engineering.
Burdick Harold A.
Moulis Thomas N.
Wolfe Willis R.
LandOfFree
Variable valve actuating device and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable valve actuating device and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable valve actuating device and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2251648