US 12,429,094 B1 · Hydrostatic pump and coupler for same

Abstract

A hydrostatic pump includes a first pumping unit having a first driveshaft extending between a first end and a second end. A second pumping unit has a second driveshaft, the second driveshaft extending between a first end and a second end. A port block is positioned between the first pumping unit and the second pumping unit. A coupler is positioned within the port block, the coupler receiving the second end of the first driveshaft and the first end of the second driveshaft and configured to transmit torque from the first driveshaft to the second driveshaft. The coupler includes an internal spline configured to engage the second end of the first driveshaft and a support land spaced apart from the internal spline via an annular recess, the support land configured to support the first driveshaft at a location between the internal spline and the first end of the first driveshaft.

Claims20

Dependent claims

A hydrostatic pump comprising:

a first pumping unit having a housing and a first driveshaft supported via a first bearing within the housing of the first pumping unit, the first driveshaft extending along a longitudinal axis between a first end and a second end;
a second pumping unit having a housing and a second driveshaft supported via a second bearing within the housing of the second pumping unit, the second driveshaft extending along a longitudinal axis between a first end and a second end;
a port block positioned between the first pumping unit and the second pumping unit, the port block defining a passage extending therethrough;
and
a coupler positioned within the passage of the port block, the coupler having an inner surface that receives the second end of the first driveshaft and the first end of the second driveshaft, the coupler configured to transmit torque from the first driveshaft to the second driveshaft,
wherein the coupler includes an internal spline configured to engage the second end of the first driveshaft and a support land spaced apart from the internal spline via an annular recess, the support land configured to support the first driveshaft at a location between the internal spline and the first end of the first driveshaft.

3 more elements

A coupler for a hydrostatic pump configured to transmit torque from a first driveshaft to a second driveshaft, the coupler comprising:

a cylindrical body extending from a first end to a second end, the cylindrical body having an outer surface and an inner surface, wherein the cylindrical body is configured to receive the first driveshaft through the first end and is configured to receive the second driveshaft through the second end;
a first internal spline formed on the inner surface and configured to engage the first driveshaft and a second internal spline formed on the inner surface and configured to engage the second driveshaft, the first and second internal splines located between the first and second ends of the cylindrical body;
a first support land formed on the inner surface and located between the first internal spline and the first end, the first support land configured to engage the first driveshaft when the first driveshaft is in engagement with the first internal spline;
and
a second support land formed on the inner surface and located between the second internal spline and the second end;
the second support land configured to engage the second driveshaft when the second driveshaft is in engagement with the second internal spline;
wherein the first support land is spaced apart from the first internal spline by a first annular recess formed in the inner surface of the cylindrical body;
and
wherein the second support land is spaced apart from the second internal spline by a second annular recess formed in the inner surface of the cylindrical body.

6 more elements

Dependencies are inferred from the claim text.

Hydrostatic pump and coupler for same

Life of this patent

Hydrostatic pump and coupler for same

Life of this patent

Abstract

Claims20