Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Reexamination Certificate
2007-09-03
2011-12-06
Lewis, Tisha (Department: 3655)
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
C477S092000, C477S182000
Reexamination Certificate
active
08070652
ABSTRACT:
The present invention relates to a method for overcoming tooth butt conditions (ZaZ) when engaging gears in transmissions. A sensitive adjustment of the clutch to apply torque for rotating the drive shaft of the transmission in order to overcome tooth butt conditions has certain limits because of the proportion of the power required and desired for making said sensitive adjustment. This may cause unpleasant jerking of the vehicle or a clearly audible locking noise of the involved positively connected elements and undesired mechanical stress to said elements.The method according to the present invention provides a remedy due to the fact that during each shifting process, regardless of the occurrence of a tooth butt condition, the clutch is brought into a position allowing minimum predetermined torque transmission to the drive shaft of the transmission, and this torque is supported on a transmission brake, which is often already available. Due to its substantially smaller size, the transmission brake can much more quickly and accurately adjust a desired net torque curve and torque progress on the drive shaft of the transmission when a tooth butt condition occurs and thus make it significantly easier to overcome the tooth butt condition.
REFERENCES:
patent: 2342985 (1944-02-01), Tyken et al.
patent: 2993574 (1961-07-01), Gardner
patent: 3508450 (1970-04-01), Richards
patent: 3667309 (1972-06-01), Franz et al.
patent: 3834499 (1974-09-01), Candellero et al.
patent: 6769523 (2004-08-01), Muetzel et al.
patent: 7367923 (2008-05-01), Zenno et al.
patent: 2004/0118652 (2004-06-01), Muetzel et al.
patent: 2246908 (1973-04-01), None
patent: 19708930 (1998-09-01), None
patent: 1669270 (2006-06-01), None
patent: 2006/032317 (2006-03-01), None
Doebele Bernd
Wiencek Norbert
Davis & Bujold P.L.L.C.
Lewis Tisha
ZF Friedrichshafen AG
LandOfFree
Method for overcoming tooth butt conditions when engaging... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for overcoming tooth butt conditions when engaging..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for overcoming tooth butt conditions when engaging... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4308947