Patent ID: 6966181
Filing Date: 2005-11-22
Classification: B60K,F16D,F16H

Abstract:
1. A hydrostatic transmission, comprising: a housing, an interior space of said housing serving as a fluid sump; a pair of first and second fluid passages disposed in said housing; a hydraulic pump disposed in said housing; a hydraulic motor disposed in said housing, wherein said first and second fluid passages are interposed between said hydraulic pump and said hydraulic motor so as to constitute a closed fluid circuit as a hydrostatic transmission; a charge fluid passage including an oil inlet, said charge fluid passage being disposed in said housing so as to be connected with each of said first and second fluid passages for supplying fluid from said fluid sump into said closed fluid circuit; and a drain fluid passage disposed in said housing so as to be connected with at least one of said first and second fluid passages and including a drain port and a drain hole so that, when hydraulic pressure in said at least one of said first and second fluid passages is increased, excessive fluid in said at least one of said first and second fluid passages is drained through said drain fluid passage to said fluid sump, wherein an axis of said charge oil inlet and an axis of said drain port are not perpendicular and said charge oil inlet and said drain hole are oriented opposite to and facing away from each other.