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:
Jan. 14, 2003
Filed:
Mar. 27, 2001
Jürgen Legner, Friedrichshafen, DE;
Eduard Heilig, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A reversing transmission shiftable under load in which the reversing clutches ( ) are automatically evacuated by the flow of pressure medium through the clutch ( ) not subjected to pressure wherein bores ( ), which in this shifting state, are connected to the oil reservoir ( ) are placed at the highest point of the piston chamber. The shifting clutches ( ) are configured as negative clutches. For modulating the pressure during a reverse shift, an accumulator ( ) is provided from which pressure medium flows out via orifices ( ). For inching a valve ( ) is provided via which the closed clutch ( ) can be subjected to a pressure whose level can be continuously varied.