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. 17, 1989
Filed:
Apr. 01, 1988
Giuseppe Amedei, Torino, IT;
Giovanni Tornactore, Torino, IT;
Fiatgeotech-Tecnologie per la terra S.p.A., Modena, IT;
Abstract
A gearbox with a large number of ratios can be operated according to the laws of pressure variation with respect to the friction clutches provided for the engagement of the various ratios wherein the laws of pressure variation are no longer fixed but can be adapted to the various requirements for effective operation of the gearbox according to operative conditions of the vehicle in which the gearbox is installed. The valve units are exclusively electro-hydraulic proportional-responsive valve units. The operating conditions of the gearbox and the tractor in which it is installed are monitored by suitable devices which generate electrical signals indicative of the operating conditions. An electronic control unit is supplied with these signals and is arranged to pilot the electro-hydraulic proportional-responsive valves so as to regulate the manner of combined engagement and disengagement of the hydraulic clutches in dependence on the operative conditions.