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. 13, 1987
Filed:
Oct. 18, 1985
Basil White, Roscoe, IL (US);
Twin Disc, Incorporated, Racine, WI (US);
Abstract
A multi-speed power transmission utilizing ten gears, seven clutches and four shafts provides eight forward speeds and four reverse speeds. The transmission is coaxial in that the input and the output shafts are on the same centerline. The transmission requires only a minimum number of gears, clutches and shafts for the large number of gear ratios provided, and at the same time it is relatively compact and has only three shaft centers. In this transmission there are always three clutches applied in any speed range. Of the seven shifts between forward speed ranges, four of them require the engagement of one different clutch only, two of them require two different clutches to engage simultaneously, and one shift requires engaging three different clutches. The clutches are of the type having multiple friction plates, and hydraulically applied force pistons which are spring load returned. The clutches include appropriate ball dump valves in the force pistons.