Transverse hydrostatic upp drive

Claim 2

In a power drive assembly; an engine having an engine housing and an output shaft extending centrally from one end said engine housing; said engine housing having a transmission mounting pad extending around said output shaft and a differential housing portion projecting from the perimeter of said engine housing; a differential drive in said differential housing on an axis offset and parallel to said output shaft, a hydrostatic transmission housing secured to said mounting pad having a main portion having an intermediate wall including a pump chamber with a pump therein coaxial with and driven by said output shaft and including a motor chamber with a motor therein in fluid communication with said pump and having a motor driven shaft driven by said motor and located on an axis parallel to and spaced from said output shaft and said differential axis and drive connected to said differential drive.

Claim 3

The invention defined in claim 1 and said engine housing having a rigid block portion; said engine mounting pad being formed integrally with said block portion and extending around both said output shaft and said driven shaft; said block portion having a base portion extending on one side to provide a portion of said differential housing portion; said block portion having an integral shaft support structure on said one side above said base portion rotatably supporting said motor driven shaft.

Claim 4

In a power drive assembly; an engine having an engine housing with a power portion, a driven shaft support portion on the upper part of one side of the power portion and a differential drive portion on the lower part of said one side of the power portion; an engine output shaft driven by said engine and rotatably mounted on one end of said power portion; a hydrostatic transmission housing secured to said power portion and having an intermediate wall with a pump chamber and motor passages on the side facing said one end of said engine and pump passages coaxial with said pump chamber and a motor chamber coaxial with said motor passages, both on the opposite side of said wall; pump means mounted in said pump chamber coaxial with and drive connected to said engine output shaft; motor means mounted in said motor chamber having a coaxial driven shaft driven by said motor means and rotatably mounted in said driven shaft support portion in spaced parallel relation to said engine shaft; said pump chamber and said motor chamber being in partial overlapping relation with napes at the intersection of their perimeters to reduce the space between said engine shaft and driven shaft; connecting passage means extending from said pump passages along said opposite side of said wall, across said wall at the napes between said pump and motor chambers and along said one side of said wall to said motor passages; a differential drive rotatably mounted in said differential drive portion on an axis spaced and parallel to both said engine shaft and driven shaft and drive connected to said driven shaft.

Claim 5

In a power drive assembly; an engine having an engine housing with a power portion, a driven shaft support portion on the upper part of one side of the power portion and a differential drive portion on the lower part of said one side of the power portion; an engine output shaft driven by said engine and rotatably mounted on one end of said power portion; a hydrostatic transmission housing secured to said power portion and having an intermediate wall with a pump chamber and motor passages on the side facing said one end of said engine and pump passages coaxial with said pump chamber and a motor chamber coaxial with said motor passages, both on the opposite side of said wall; pump means mounted in said pump chamber coaxial with and drive connected to said engine output shaft; motor means mounted in said motor chamber having a coaxial driven shaft driven by said motor means and rotatably mounted in said driven shaft support portion in spaced parallel relation to said engine shaft; said pump chamber and said motor chamber being in partial overlapping relation with napes at the intersection of their perimeters to reduce the space between said engine shaft and driven shaft; connecting passage means extending from said pump passages along said opposite side of said wall, across said wall at the napes between said pump and motor chambers and along said one side of said wall to said motor passages; a differential drive rotatably mounted in said differential drive portion on an axis spaced and parallel to both said engine shaft and driven shaft and drive connected to said driven shaft.

Claim 6

The invention defined in claim 3 and connecting drive means drive connecting said driven shaft to said differential drive and reinforcing webs formed on said one side of said engine housing extending from said driven shaft support portion to said differential drive portion to further support said last mentioned portions and forming at least partially enclosing said connecting drive means.

Claim 7

The invention defined in claim 3 and said pump chamber and passages, said motor chamber and passages and said connecting passage means of said intermediate wall being formed integrally with said intermediate wall to rigidify and reinforce each other.

Claim 8

The invention defined in claim 5 and said pumps and motors being radial pumps and motors having a central pintle fixed to said wall respectively in said pump and motor chambers and each having a spider rotatably mounted on said pintle and having spherical pistons and cylindrical cylinders on said pistons rotatably mounted in the chamber.