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:
Feb. 01, 2005
Filed:
Dec. 11, 2000
Sverker Alfredsson, Vastra Frolunda, SE;
Sverker Alfredsson, Vastra Frolunda, SE;
Volvo Lastvagnar AB, Gothenburg, SE;
Abstract
Hydraulic control system for a vehicle transmission connected to an output shaft from a hydraulic torque converter () with a hydraulically operated disc clutch for locking the torque converter and which has two hydraulically operated disc clutches for shifting. The control system has a low pressure circuit () with a low-pressure pump feeding fluid through the torque converter, and a high pressure circuit () with a high-pressure pump (), which feeds fluid via valves () to the disc clutches. The high-pressure pump has variable displacement, which is regulated by the operating pressure of the disc clutch of the torque converter, so that the high-pressure pump is set to a lower displacement when this last-mentioned clutch is engaged than when it is disengaged.