Importance

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Abstract

A hydrostatic pump of the axial piston type having a significantly reduced overall length due to a special three point bearing arrangement for the main shaft (1) of the pump and the charge pump shaft (12). The improvement comprises a bearing assembly which consists of just three bearings (6, 14, 23) at separate locations for simultaneously supporting the coupled main shaft (1) and charge pump shaft (12). A first bearing 6 is located at the end of the main shaft (1) which is opposite that coupled to the charge pump shaft (12), a second bearing (14) is located at the end of the charge pump shaft (12) which is opposite to that coupled to the main shaft (1), and a third bearing (23) is located at the junction of the coupled shafts (1,12) to provide for their common support. The third bearing (23) can be a needle bearing or of the plain bushing type. The shafts (1,12) can be coupled by mating splines (17,22) and engage each other in a clearance fit (21).

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First Claim