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. 03, 2003
Filed:
Apr. 25, 2001
Kevin L. Johnson, Salem, IN (US);
Tecumseh Products Company, Tecumseh, MI (US);
Abstract
A hydrostatic transmission including a fluid motor and a variable displacement fluid pump in fluid communication with the fluid motor and having a first and a second, much greater, fluid displacement rate. The pump is mounted on a block having a cylindrical surface, a passage through which fluid flows from the pump to the motor, and a fluid bleed hole extending from the passage to the cylindrical surface. The passage and a sump external to the pump are in fluid communication through the bleed hole and the void of an annular element disposed about and in sliding contact with the cylindrical surface when the pump is operating at its first rate and the annular element is in a first position. The bleed hole and the sump are substantially out of fluid communication when the pump is operating at its second rate and the annular element is in a second position.