Abstract

A hydraulic motor unit is provided wherein a bent axis type axial piston motor having a high operating efficiency is incorporated while the compactness of the unit is maintained. The dimensional features of this invention are attained, in one aspect, from a special arrangement in which a multiple-plate type hydraulically actuated brake unit is disposed in an intermediate position between bearings supporting an output shaft of the hydraulic motor. Another aspect of such dimensional features of this invention resides in the arrangement such that the control valve unit, which can otherwise be a substantial obstacle in the installation work, is located neatly in a space made available by the specific construction peculiar to the bent axis type hydraulic motor unit so that the control valve unit may never become an obstacle in either installed on or removed from a machine or vehicle. In addition, there is provided an extra passage way to effect efficient circulation of the operating liquid throughout the hydraulic motor unit in order to prevent any local accumulation of heat in the operating liquid. When necessary, as in case of failure, there is provided a special arrangement in the reduction mechanism of the motor unit adapted to drive a vehicle or machine so that a vehicle or machine can be readily towed or caused to rotate by another rescue unit while leaving the hydraulic motor unit unturned and free from any substantial resistance.

Other References

• "Wheel Motor", Volvo Hydraulics Publication