Eaton Corporation

James M Casey

Mark S Jennen

Dennis E Szulczewski

Russell G Miller

An HST propel system includes first and second pumps having displacements variable in response to movement of first () and second () control shafts, respectively; and a linkage arrangement for moving the control shafts in unison in response to movement of an operator input (). The linkage arrangement comprises a crank arm () rotatable about its axis in response to movement of the input device, first () and second () input arms fixed relative to the crank arm, and first () and second () elongated control rods pivotally connected to the input arms. The system includes a swivel connector () cooperating with its input arm to define a swivel axis (S.A.), fixed relative to the axis of the crank arm, and a swivel connector () cooperating with its input arm to define a swivel axis (S.A.), moveable relative to the axis of the crank arm for straight tracking adjustment.

Speed equalizing linkage design for dual hydrostatic transmissions

A variable displacement, rotary fluid pressure pump (11) is disclosed of the type having a cam ring member (25) which is movable, in response to rotation of a control shaft (35), between a neutral position (FIG. 5) and a displaced position (FIG. 4). The pump housing (13, 15) includes a support member (25), and they cooperate to define a high-pressure fluid passage (51). In communication with the passage (51) is a recess (71), in which is disposed a dampening shoe (73). The dampening shoe is biased by high-pressure fluid in the passage (51) into engagement with an adjacent surface (77) of the cam ring (25). The surface (77) defines a neutral fluid passage (79), and the dampening shoe (73) defines a restricted opening (85). When the cam ring (25) is in the displaced position, the restricted opening (85) is blocked from communication with the neutral passage (79), but as the cam ring is returned to its neutral position, the opening (85) begins to communicate with the neutral passage (79), thus providing the pump with an increased neutral band overlap.

Growing community of inventors

Spencer, IA, United States of America

James M Casey