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. 25, 1994
Filed:
Apr. 13, 1993
Raymond J Haka, Rochester, MI (US);
Joel M Maguire, Dearborn, MI (US);
Dean E McCulloch, Rochester Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A countershaft transmission and control has an input shaft, two countershafts and an output differential. Each countershaft has a fluid operated clutch connected therewith to selectively connect the respective countershaft with the output differential through reduction gearing. A plurality of drive and driven gear members are connected in meshing relation between the input shaft and the countershafts. Individually operable synchronizers are disposed on the countershafts to selectively engage the driven gears with the countershaft to establish gear ratios between the input shaft and the output differential. The synchronizers are operated by a control mechanism comprised of drive keys for selectively connecting synchronizer forks with a longitudinally movable shaft member. The control mechanism is also operable to provide a positive displacement pump assembly operated by the shaft member to deliver pressurized fluid to the clutch member for enforcing engagement thereof.