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:
May. 15, 2001
Filed:
Nov. 16, 1999
Christian Helmut Thoma, Jersey, GB;
George Duncan McRae Arnold, Jersey, GB;
Unipat AG, Glarus, CH;
Abstract
A hydrostatic transaxle axle assembly for a vehicle such as a grass mowing lawn or garden tractor comprising a lly disposed hydrostatic transmission having a variable-displacement hydraulic pump fluidly connected to a fixed-displacement hydraulic motor, the hhousing for an internaydraulic motor being connected by differential gearing to axle shafts supported in the housing. The housing is formed by at least three housing members, two of which are separable on a first parting-plane arranged to be perpendicular with respect to the longitudinal axes of the axle shafts. One or two of the housing members being provided with an opening to allow a portion of another housing members, called the radiator member portion to extend through, and where the extending portion contains within its internal structure a number of fluid power transmitting passages arranged for the purpose of fluidly connecting the hydraulic pump with the hydraulic motor. This construction allows for improved cooling of the power transmitting fluid flowing between the pump and motor which, in the prior art, is difficult because the equivalent center section member carrying such passages is located within the axle assembly and is not exposed to an exterior surface over which cooling air from a fan driven input drive-shaft can pass.