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A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As a consequence the hydraulic fluid acts upon a

A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As a consequence the hydraulic fluid acts upon a motor system having an effective combined displacement for producing a predetermined shaft rotation rate at the volumetric flow rate which caused the pressure condition. The invention is disclosed as having particular utility for driving a cooling fan for an automotive engine.

대표청구항 ▼

An hydraulic drive apparatus comprising: (a) a supply line for receiving an hydraulic fluid; (b) displacement chamber means defining a plurality of displacement chambers, each connected to said supply line for progressive filling by said hydraulic fluid in response to an increase of flow rate in sai

An hydraulic drive apparatus comprising: (a) a supply line for receiving an hydraulic fluid; (b) displacement chamber means defining a plurality of displacement chambers, each connected to said supply line for progressive filling by said hydraulic fluid in response to an increase of flow rate in said supply line; (c) a plurality of working surfaces, each positioned within one of said displacement chambers for movement in response to said progressive filling; and (d) flow division means for apportioning the flow of said hydraulic fluid between said displacement chambers; said at least one of said plurality of working surfaces being coupled to a drive shaft and applying a tongue to drive said shaft for driving a component.