Patent ID: 6109032
Filing Date: 2000-08-29
Classification: B60K,F16H

Abstract:
A mechanism of returning to neutral for an axle driving apparatus comprising:a housing containing a fluid sump;a hydrostatic transmission for driving axles, said hydrostatic transmission including a variable capacity hydraulic pump and a hydraulic motor, wherein suction and discharge ports of said hydraulic pump are connected with respective discharge and suction ports of said hydraulic motor through fluid passages;a capacity changing member provided for said hydraulic pump, said capacity changing member being shiftable between a neutral position making said hydraulic pump discharge substantially no fluid and an acting range making said hydraulic pump discharge fluid;a biasing member which biases said capacity changing member in said acting range so as to return to said neutral position;orifices connecting said fluid passages to said fluid sump; anda shutting member facing said orifices so as to be operable to open and shut said orifices toward said fluid sump, wherein said shutting member is interlocked with said capacity changing member so that at least one of said orifices is open to said fluid sump in said acting range.