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:
Apr. 07, 1992
Filed:
Jun. 03, 1991
Shairyl I Pearce, Lititz, PA (US);
David J Rutkowski, Grosse Ile, MI (US);
John H Tanzer, Troy, MI (US);
Rudolf Beim, Southfield, MI (US);
Ford New Holland, Inc., New Holland, PA (US);
Abstract
In a transmission system having range shift levers mechanically linked to couplers and shiftable between first and second positions to select ranges of gears and electro-hydraulic powershift clutches for selecting a gear within the range selected by the range shift lever, the powershift clutches are located on each side of at least one of the couplers, between the input shaft and the coupler and between the output shaft and the coupler. A dump solenoid is controlled by operation of a clutch pedal to release fluid from the powershift clutches as the clutch pedal is depressed but before it reaches the fully depressed position so that the coupler is not being driven when coupler shifting takes place. A microprocessor is responsive to shifting of the range shift levers to control energization of the powershift clutches so that when one or more of the shift levers is shifted the lowest powershift gear is selected if the new lever positions will produced a higher gear range and the highest powershift gear is selected if the new lever positions select a lower gear range.