US 10,215,154 B2Granted

Eccentrically piloted hydraulic commutator

AssigneeParker-Hannifin Corporation

InventorKenneth Todd Gilbert

Life of this patent

Estimating the term…

Loading patent…

Abstract

A hydraulic motor includes a rotor and a stator, wherein the rotor and the stator define a plurality of motor pockets for receiving a flow of hydraulic fluid, and the rotor rotates relative to the stator based on a pressure differential between the motor pockets. A commutator having porting controls the flow of hydraulic fluid into the motor pockets. The rotor rotates about a first axis and the stator orbits about a second axis, and the stator is configured to orbit such that the second axis orbits about the first axis. The commutator is eccentrically piloted about the first axis and the second axis so that the commutator both rotates and orbits to control the flow of hydraulic fluid into the motor pockets. With such configuration, an output shaft is driven by rotation of the rotor about the first axis without orbiting, obviating the need for a drive link.

Claims20

Dependent claims

A hydraulic motor comprising:

a rotor that is connected to a shaft that rotates about a first axis;
a stator having a central axis that is a second axis different from the first axis, wherein the rotor and the stator define a plurality of motor pockets for receiving a flow of hydraulic fluid, and the rotor is configured to rotate relative to the stator based on a pressure differential between the motor pockets;
and
a commutator having porting configured to control the flow of hydraulic fluid into the motor pockets;
wherein the rotor is configured to rotate about the first axis by rotation of the shaft and the stator is configured to rotate about the second axis in response to the pressure differential, and the stator is configured to orbit within an outer housing ring in response to the pressure differential such that the second axis orbits about the first axis;
and
wherein the shaft extends through the commutator through a shaft space that is eccentrically positioned through the commutator such that the commutator is eccentrically piloted about the first axis and the second axis by rotation of the shaft so that the commutator both rotates and orbits to control the flow of hydraulic fluid into the motor pockets.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/285,996Filed 5 Oct 2016 · us provisional application
Priority: 3 Dec 2015
Published: US 2017/0159439 A18 Jun 2017
Granted: 26 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F03C 2/08
Rotary-piston engines: of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
F01C 21/108
Stators; Members defining the outer boundaries of the working chamber: with an axial surface, e.g. side plates
F04C 2/103
Of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member: one member having…
F04C 2/104
One member having simultaneously a rotational movement about its own axis and an orbital movement: having an articulated driving shaft