The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2011
Filed:
Sep. 03, 2007
Bernd Doebele, Salem, DE;
Norbert Wiencek, Hagnau, DE;
Bernd Doebele, Salem, DE;
Norbert Wiencek, Hagnau, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
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.