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. 28, 2014
Filed:
Feb. 06, 2009
Kouhei Akashi, Kanagawa, JP;
Tadashi Ikeda, Kanagawa, JP;
Kouhei Akashi, Kanagawa, JP;
Tadashi Ikeda, Kanagawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A speed change device for shifting the gear of a transmission by using a cylindrical drum that reciprocally moves and rotates, featuring the structure of a compact size and excellent operability. To execute the shifting operation, the speed change device of the invention uses a cylindrical drumthat reciprocally moves in the axial direction and is rotatably supported. Fork pins FPto FPcoupled to a plurality of forks of the transmission are fitted into drum groovestoformed in the cylindrical surface of the cylindrical drum. In each drum groove, there are formed small width portions of a width nearly equal to that of the fork pin and large width portions wider than the small width portions in a manner that the fork pin positioned at the small width portion is shifted. To shift the gear, the cylindrical drumis rotated by a select motorto select the fork pin positioned at the small width portion. Next, a threaded shaftis rotated by a shift motorto move the cylindrical drumin the axial direction to thereby shift the selected fork pin.