Hydrostatic transaxle
AssigneeTecumseh Products Company
InventorsRoland L. von Kaler, Dale I. Havens, Michael P. Weirich
Life of this patent
Estimating the term…
Abstract
A hydrostatic transaxle includes a hydrostatic transmission with a pump and motor, the pump and motor each including a track ring radially surrounding a cylinder in which are disposed a plurality of pistons rotatable on a fixed conduit. The motor track ring includes radially extending lugs disposed 180.degree. from each other that are captured between the upper and lower transaxle casing halves thereby preventing axial or radial movement of the motor track ring.
Claims14
A hydrostatic transmission comprising:
- a housing including a first part and a second part fastened to said first part, said first and second parts defining an interface therebetween where said first and second parts meet;
- input drive means for transmitting rotational energy to said transmission;
- a conduit disposed within said housing;
- a pump in said housing driven by said input drive means, said pump radially disposed on said conduit and in fluid communication therewith, said pump including a plurality of pump pistons rotatably disposed radially outwardly of said conduit;
- said pump including a track ring radially outwardly disposed of said pump pistons, said pump track ring guiding said piston and being eccentrically pivotable about said conduit;
- a motor in said housing radially disposed on said conduit and in fluid communication therewith, said motor including a plurality of motor pistons rotatably disposed radially outwardly of said conduit;
- a motor track ring radially outwardly disposed of said motor pistons and guiding said pistons, said motor track ring being radially clampingly retained by said housing parts at said interface to maintain said motor track ring fixed relative to said conduit;
- and
- output drive means connected to said motor for outputting rotational energy therefrom.
A hydrostatic transmission comprising a two piece housing defining a cavity in which is disposed a conduit, a pump with a pivotable pump track ring and being radially outwardly disposed on said conduit and including a plurality of pump pistons rotatably disposed radially outwardly of said conduit and radially inwardly of said pump track ring, a motor with a fixed motor track ring and being radially outwardly disposed on said conduit and including a plurality of motor pistons rotatably disposed radially outwardly of said conduit and radially inwardly of said motor track ring, said housing comprising two halves fastened together and defining an interface where said halves meet;
- and
- means for radially clampingly retaining said motor track ring by said two housing halves at said interface.
Dependencies are inferred from the claim text.