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, 1977
Filed:
Aug. 21, 1975
Charles H Herr, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A control system for a power transmission includes a plurality of sequentially arranged speed ratio modules each having friction means responsive to a single signal for establishing either direct or reduction drive across the respective module, the control system including separate valves for selectively communicating the single signal to each respective module in response to governor means coupled with an output drive component of the transmission. A preferred embodiment of the control system is adapted for use in a power transmission where the speed ratio modules are of similar construction, each having a fixed housing forming a portion of an enclosure for the entire transmission, the valve means operated by the governor comprising a plurality of axially aligned abutting spools movable in unison by the governor and adapted to communicate the actuating signal to each respective module.