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. 20, 2000
Filed:
Sep. 23, 1998
Horst Deininger, Horstein-Alzenau, DE;
Linde Aktiengesellschaft, , DE;
Abstract
A hydrostatic drive system is provided for a vehicle, in particular an industrial truck, with a hydrostatic traction drive system (16), a hydraulic work system (13) and a hydraulic steering system (9). The invention provides a drive system that is compact and exhibits improved operating behavior during the change from traction operation to coasting operation. To supply the traction drive system (16), the hydraulic work system (13) and the steering system (9), there is a hydraulic pump (1) with an adjustable delivery volume that works in the open circuit, which pump (1) discharges into a delivery line (5), in which there is a traction drive control valve (19) for the pressurization of the traction drive system, which is connected to an outlet line (22) leading to a reservoir, and which can be connected to delivery lines (20a, 20b) leading to the traction drive system (16), whereby in both the delivery line (5) and in the outlet line (22) there are respective flow regulators (23, 24), each of which can be pressurized by the pressure upstream of the choke point of the traction drive control valve (19) in the closing direction, and by the pressure downstream of a throttle point of the traction drive control valve (19) and by a spring in the opening direction. In one embodiment of the invention, a delivery branch line (5a) branches off from the delivery line (5) upstream of the flow regulator (24) and can be brought into communication with the steering system (9) and the hydraulic work system (13).