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:
Aug. 16, 1994
Filed:
Oct. 18, 1993
Applicant:
Inventor:
Michael D Testerman, Dearing, KS (US);
Assignee:
Deere & Company, Moline, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
192 / ; 192 / ;
Abstract
A vehicle powershift transmission has a lube oil passage which communicates lube oil to a clutch pack. Communication of lube oil is controlled as a function of the engagement state of the clutch pack. The hydraulic control pressure required to initially engage the clutch pack is determined or calibrated by a method wherein the lube oil pressure is monitored while the clutch control pressure is gradually increased. When the lube oil pressure reaches a certain level corresponding to clutch pack engagement, the current value of the control pressure is saved as the calibration pressure.