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:
Jul. 17, 2001
Filed:
Oct. 25, 1999
Franz Forster, Karlstadt-Muhlbach, DE;
Linde Aktiengesellschaft, , DE;
Abstract
A hydrostatic motor unit designed as a wheel drive comprises at least two hydraulic motors, at least one of which has a variable capacity. The hydraulic motors can be switched hydraulically in parallel and have output rotors that can be coupled with each other. The invention teaches that the output rotors are oriented coaxially to one another and are connected to each other in rotational synchronization. The output rotors are preferably part of a one-piece rotor block that contains the work chambers of the two hydraulic motors. The motor unit consists of an internally pressurized, in particular multiple-stroke radial piston motor that has a constant capacity, and a reversible axial piston motor utilizing the swash plate construction that has an adjustable capacity. From a common, axially oriented control surface for the radial piston motor and the axial piston motor, there are hydraulic channels of approximately the same length that lead to the work chambers of the hydraulic motors. The control surface provided with pressure equalization grooves is formed on an axially movable control body, which can be pressed by spring force and hydraulic pressure toward a counter surface located on the rotor block. The rotor block is penetrated by a central recess, in which there are hydraulic lines that emerge in the control surface.