Sauer Gmbh

Scott D Meyer

John Fleming

David D Dirks

Jeffrey A Baldus

Jim D Ryken

Dave D Dirks

Ronald J Sporrer

A device for varying the displacement of a variable displacement bent axis unit includes a one-piece yoke having a bucket portion adapted to carry a cylinder block kit of the bent axis unit, a trunnion bearing portion for swing control on one side of the bucket portion, and a trunnion portion for fluid porting on the other side of the bucket portion. The bucket portion has a bottom wall, a continuous side wall, and an open top. Inside the yoke is a pair of fluid passages intersecting the interior of the bucket portion and extending separately and entirely within the bottom wall and the side wall before opening onto the trunnion portion for fluid porting.

Single piece yoke stroking device for bent axis type hydraulic pumps and variable motors

An improved apparatus for retaining slipper holddown pins radially in a hydraulic unit includes a cylinder block having a plurality of holes therein for respectively receiving a corresponding plurality of elongated slipper holddown pins, each having a maximum transverse width. The holes are adjacent to and communicate with a center bore of the cylinder block to form respective throats. The throats have a maximum width that is less than the maximum transverse width of the pins such that the pins cannot be radially displaced through the respective throats. Each hole has a side wall that extends more than 180.degree. around its central axis. The side wall defines the throat between the hole and the center bore. The shaft can be inserted into driving engagement with the center bore of the cylinder block. The slipper holddown pin has a maximum transverse width greater than the maximum width of the throat. Thus, the pin is radially constrained in the hole without applying external forces and cannot move radially outwardly through the throat. The bore of the cylinder block and the holes for receiving the pins can be simultaneously formed with a single broaching bar.

Retaining system for slipper holddown pins

A swashplate leveling device has a reciprocative leveling follower movable along a fixed axial pin. The cam is biased into engagement with a swashplate of an axial piston variable displacement hydraulic unit to position the swashplate in a zero displacement orientation when there is no control input to the hydraulic unit. The leveling device has a pair of contact points, one positioned on each side of the swashplate tilt axis in a manner that both contact points engage the swashplate when it is leveled to its zero displacement orientation.

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Ames, IA, United States of America

Scott D Meyer