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:
Jun. 06, 1995
Filed:
Jun. 22, 1993
Jean-Jacques Lasoen, Villepreux, FR;
Massey-Ferguson S.A., , FR;
Abstract
A continuously variable transmission includes an input shaft, an output shaft, and first and second epicyclic gear trains, each with an input member, an output member and a reaction member. An hydrostatic shunt loop including first and second hydraulically interconnected variable displacement hydraulic units interconnects the two epicyclic gear trains. The input members of both epicyclic gear trains are driven from the input shaft, and the output members of both epicyclic gear trains drive the output shaft. First and second drive trains are provided for alternatively coupling the first variable displacement hydraulic unit respectively to either the input shaft or the reaction member of the first epicyclic gear train. Third and fourth drive trains are provided for alternatively coupling the second variable displacement hydraulic unit respectively to either the output shaft or the reaction member of the second epicyclic gear train. A transmission control system is provided for selective operation of the first, second, third, and fourth gear trains to operate the transmission in three modes. In the first mode, the second and third gear trains are operational to utilize the first epicyclic only with its reaction member connected to the output shaft via the hydrostatic shunt loop. In the second mode, the second and fourth gear trains are operational to utilize both epicyclics with their reaction members interconnected via the hydrostatic shunt loop. Finally, in the third mode, the first and fourth gear trains are operational to utilize the second epicyclic only with its reaction member connected to the input shaft via the hydrostatic shunt loop.