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:
Oct. 31, 1989
Filed:
Jun. 30, 1988
Joachim Horsch, Lombard, IL (US);
J. I. Case Company, Racine, WI (US);
Abstract
A hydraulic control system for a transmission including a speed transmission assembly, a range transmission assembly, and a hydraulically actuated master clutch for selectively coupling the transmission assemblies. The speed transmission assembly includes a plurality of hydraulically actuated clutch assemblies for effecting different forward output speeds and at least one reverse output speed. The range transmission assembly also includes a plurality of hydraulically actuated clutch assemblies. The control system includes a valve body connected to a hydraulic source of fluid pressure. A plurality of control valves are positioned in the valve body by an operator controlled shift lever. The control valves direct fluid pressure to various clutch assemblies in the speed and range transmission assemblies to condition the transmission into a forward, reverse, or neutral mode of operation as a function of shift lever position. The control system further includes hydraulic logic for modulating master clutch operation as a function of various transmission operating conditions.