Variable displacement hydraulic motor
AssigneeDana Motion Systems Italia S.R.L.
InventorsFederica FRANZONI, Fabio NATALI, Alessandro SASSI
Life of this patent
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Abstract
Systems and methods for a variable displacement hydraulic motor. The hydraulic motor, in one example, includes a swash plate with a tilt angle, multiple piston assemblies configured to rotate about a drive shaft. In the motor, each of the piston assemblies includes an inner piston slideably coupled to an outer piston that mates with a cylinder in a cylinder block and a retainer device configured to inhibit axial movement of the outer piston in a first position and permit axial movement of the outer piston in a second position.
Claims20
A variable displacement hydraulic motor, comprising:
- a swash plate with a tilt angle;
- and
- a plurality of piston assemblies configured to rotate about a drive shaft;
- wherein each of the plurality of piston assemblies includes:
- an inner piston slideably coupled to an outer piston that mates with a cylinder in a cylinder block;
- and
- a retainer device configured to inhibit axial movement of the outer piston in a first position and permit axial movement of the outer piston in a second position.
A method for operation of a variable displacement hydraulic motor, comprising:
- selectively adjusting a displacement of the variable displacement hydraulic motor via adjustment of a hydraulic retainer device;
- wherein the hydraulic retainer device is configured to:
- in a first position, delimits axial movement of an outer piston in a piston assembly that includes an inner piston;
- and
- in a second position, permit concurrent axial movement of the outer piston and the inner piston.
A multi-speed hydraulic motor, comprising:
- a swash plate with a fixed tilt angle;
- a plurality of piston assemblies configured to rotate about a drive shaft;
- wherein each of the plurality of piston assemblies includes:
- an inner piston slideably coupled to an outer piston that mates with a cylinder in a cylinder block;
- and
- a hydraulic retainer device delimiting the axial displacement of the outer piston to in a reduced displacement configuration and permitting full axial displacement of the outer piston in a full displacement configuration.
Dependencies are inferred from the claim text.