Importance

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Abstract

A wheel hub drive includes a stationary hub carrier, a rotational hub, a hydrostatic axial piston motor using the swashplate construction fastened to the hub drive and in a direct drive connection with the hub, and a brake connected directly between the hub carrier and the hub. To achieve the smallest possible dimensions of the hub drive, the axial piston motor has an external bearing cylinder block and a motor shaft that is free of lateral forces and is rotationally synchronously coupled with the hub. The hub has a separate bearing system for mounting in the hub carrier. A bearing system is radially between a central bearing journal of the hub and a bearing segment connected with or formed on the hub. The bearing system is preferably formed of two helical roller bearings in an O-arrangement. The brake is located radially outside and axially inside the area of the bearing system. A flange provided on the hub for fastening at least one wheel rim has a companion drum that covers the brake. The drum engages with the brake and is detachably connected with the flange. The drum can be fixed in its axial position by wheel fastening bolts. The wheel fastening bolts and/or a longitudinal gearing on the outer peripheral surface of the flange and a longitudinal gearing on the inner peripheral surface of the companion drum can transmit the braking moment between the companion drum and the flange. The brake is a wet, hydraulically actuated spring-loaded multiple-disc brake connected to an oil circuit of the axial piston motor. A sealing element is radially between a terminal segment of the companion drum and the hub carrier. The outside diameter of the hub carrier in the vicinity of the terminal segment of the companion drum is greater than the outside diameter of the brake.

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First Claim