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 positioned within the cylinder block and 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;
- wherein the cylinder block rotates about the drive shaft;
- wherein each of the retainer devices includes a pin that is radially aligned with regard to a rotational axis of the drive shaft;
- and
- wherein each of the retainer devices includes an actuation chamber that is hydraulically coupled to a hydraulic line.
A method for operation of a variable displacement hydraulic motor, comprising:
- selectively adjusting a displacement of the variable displacement hydraulic motor via adjustment of multiple hydraulic retainer devices;
- wherein each of the multiple hydraulic retainer devices are configured to:
- in a first position, delimits axial movement of an outer piston in a piston assembly that includes an inner piston, wherein the inner piston and the outer piston are included in a cylinder block;
- and
- in a second position, permit concurrent axial movement of the outer piston and the inner piston;
- wherein the multiple hydraulic retainer devices are positioned within the cylinder block;
- wherein the multiple piston assemblies rotate about a drive shaft;
- wherein the cylinder block rotates about the drive shaft;
- wherein each of the multiple hydraulic retainer devices includes a pin that is radially aligned with regard to a rotational axis of the drive shaft;
- and
- wherein each of the hydraulic retainer devices include an actuation chamber that is hydraulically coupled to a hydraulic line.
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 in a reduced displacement configuration and permitting full axial displacement of the outer piston in a full displacement configuration;
- wherein each of the hydraulic retainer devices are positioned within the cylinder block;
- wherein the cylinder block rotates about the drive shaft;
- wherein each of the retainer devices includes a pin that is radially aligned with regard to a rotational axis of the drive shaft;
- and
- wherein each of the retainer devices includes an actuation chamber that is hydraulically coupled to a hydraulic line.
Dependencies are inferred from the claim text.