Deere & Company

Sauer-danfoss Inc.

Jeffrey C Marks

Doug Kardell

Richard Treichel

Timothy J Mattson

Scott Meyer

Christopher P Masini

John Fleming

Mark A Taute

Jon R Delaney

A bent axis hydrostatic module, comprising: a frame, a pair of parallel laterally spaced shafts rotatably supported by the frame and directed outwardly from the frame in the same direction. Two yokes are pivotally mounted about parallel axes on the frame. A hydrostatic power unit is swingably carried by each yoke, and each hydrostatic power unit being operatively connected to one of the shafts to rotate the same. A pair of system pressure conduits in the frame with each of the pressure conduits are fluidly connected to each of the cylinder blocks. A control system is provided for pivoting the yokes including means for independently pivoting the yokes about parallel axes.

Bent axis hydrostatic module with multiple yokes

A park brake sensor valve is added to a circuit having an engagement override valve (EOV). The EOV normally prevents engagement of the transmission any time a vehicle is started with the speed selector in any position other than neutral. The park brake selector valve causes the EOV to disengage the transmission anytime the park brake is activated.

Park brake sensor and transmission override

A three-speed planetary transmission having a single ring gear and dual planetary gear sets meshing with the single ring gear. Gear changes are effected by coupling or alternately fixing a set of two sun gears which mesh with the two planetary gear sets. This transmission can provide a direct drive and two other speed ratios. Utilizing a single ring gear in combination with two planetary gear sets allows nesting of gear elements and economy of space for the transmission.

Three-speed planetary transmission

An agricultural tractor with over-size front tires for use with a mechanical front wheel drive is provided with large caster angle front wheels to allow a front wheel to tuck under the tractor to achieve small radius turns.

Growing community of inventors

Waterloo, IA, United States of America

Jeffrey C Marks