Importance

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Abstract

A hydraulic motor that provides an improved sealing configuration for sealing a shaft with respect to a housing of an internal gear motor or pump of the type commonly known as a gerotor. The hydraulic motor provides a housing having an output end and an input end with an opening extending therebetween. A gerotor is connected to the input end of the housing, and a cover is connected to and covers the gerotor while also receiving and rotatably supporting an end of the shaft. An inlet port and an outlet port are provided in the cover for communicating hydraulic fluid to and from the gerotor. A large roller bearing is coupled to the shaft and disposed within the opening of the housing to rotatably support the shaft. For high pressure applications, a pair of conventional mechanical face seals are coupled to the shaft and disposed within the opening of the housing. A third conventional lip seal may also be utilized as an added level of sealing the shaft with respect to the housing. For low pressure applications, the lip seal is utilized without the mechanical face seals. A means for draining excess fluid and relieving excess hydraulic pressures may also be provided for high pressure applications. A passageway extending through a side wall of the housing and through a bearing/seal support may be provided to drain hydraulic fluid from predetermined areas within the housing to an external fluid reservoir.

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