Patent ID: 7610986
Filing Date: 2009-11-03
Classification: A01D

Abstract:
1. An HST unit applied to a working vehicle comprising: a first hydraulic motor unit capable of being independently mounted to the working vehicle, the first hydraulic motor unit including a first motor shaft, a first hydraulic motor main body supported by the first motor shaft in a relatively non-rotatable manner with respect to the first motor shaft, and a first motor case accommodating the first motor main body and supporting the first motor shaft in a rotatable manner around an axis line, the first motor case being formed with a pair of first motor-side operational fluid passages having first ends fluidly connected to the first motor main body and second ends opened to an outer surface to form a pair of first motor-side operational fluid ports; a second hydraulic motor unit capable of being independently mounted to the working vehicle, the second hydraulic motor unit including a second motor shaft, a second hydraulic motor main body supported by the second motor shaft in a relatively non-rotatable manner with respect to the second motor shaft, and a second motor case accommodating the second motor main body and supporting the second motor shaft in a rotatable manner around an axis line, the second motor case being formed with a pair of second motor-side operational fluid passages having first ends fluidly connected to the second motor main body and second ends opened to an outer surface to form a pair of second motor-side operational fluid ports; and a hydraulic pump unit capable of being independently mounted to the working vehicle, the hydraulic pump unit including first and second pump shafts, first and second hydraulic pump main bodies respectively supported by the first and second pump shafts in a relatively non-rotatable manner with respect thereto, and a pump case accommodating the first and second pump main bodies and supporting the first and second pump shafts in a rotatable manner around respective axis lines, the pump case being formed with a pair of first pump-side operational fluid passages having first ends fluidly connected to the first pump main body and second ends opened to an outer surface to form a pair of first pump-side operational fluid ports and a pair of second pump-side operational fluid passages having first ends fluidly connected to the second pump main body and second ends opened to an outer surface to form a pair of second pump-side operational fluid ports; wherein the hydraulic pump unit and the first and second hydraulic motor units form an assembly capable of being integrally and detachably mounted to the working vehicle in a state that the pair of first pump-side operational fluid ports are fluidly connected to the pair of first motor-side operational fluid ports, respectively, and the pair of second pump-side operational fluid ports are fluidly connected to the pair of second motor-side operational fluid ports, respectively.