Patent ID: 6782699
Filing Date: 2004-08-31
Classification: B60K,B60Y,F16H,Y10T

Abstract:
A hydrostatic transmission comprising:(a) a housing; (b) a one-piece casting at least partially disposed in said housing and surrounded from below by said housing and comprising a pump fluid coupling surface and a motor fluid coupling surface respectively disposed within said housing, where said pump fluid coupling surface is perpendicular to said motor fluid coupling surface; (c) a pump rotatably mounted on said one-piece casting and disposed within said housing and driven by an input shaft, said pump comprising a plurality of pistons; (d) a motor rotatably mounted on said one-piece casting and disposed within said housing and hydraulically connected to said pump; and (e) a motor output shaft driven by said motor and being at least partially supported by said housing, wherein the axis of said motor output shaft is below the plane of said pump fluid coupling surface; wherein said one-piece casting further comprises a bore receiving said motor output shaft and an outer shoulder portion surrounding said bore, said outer shoulder portion supported by an interior surface of said housing in at least one location radially adjacent said bore, and where said at least one location lies above said axis of said motor output shaft.