Hydraulic motor

A hydraulic motor comprising:

• a motor housing;
• and
• a revolving group for revolving in respect to the motor housing, the revolving group including:
• an inner rotor for rotating in respect to the motor housing, the inner rotor having a plurality of lobes circumferentially spaced along an outer periphery of the inner rotor;
• and
• an orbiter surrounding the inner rotor, the orbiter having a plurality of radially-extending rounded portions circumferentially spaced along an inner periphery of the orbiter, and the orbiter having a plurality of radially outwardly extending fluid windows,
• wherein the orbiter orbits around the inner rotor in respect to the motor housing, and the lobes glide against the radially-extending rounded portions to define a plurality of volume chambers,
• wherein the orbiter has fixed for movement therewith a plurality of radially outwardly extending fluid windows aligned with the plurality of volume chambers, and
• wherein spacing between the plurality of fluid windows and the plurality of radially-extending rounded portions remains constant during rotation of the inner rotor and orbiting of the orbiter, thereby preventing direct fluid communication between the volume chambers.

A method of utilizing pressurized fluid to produce rotary motion comprising the steps of:

• injecting fluid into a motor housing and directing the fluid through a plurality of fluid ports in a commutator assembly coupled to the motor housing;
• selectively transmitting the fluid through fluid windows of a revolving valve, the revolving valve further including N rotor lobes on an inner rotor for rotating about a fixed longitudinal axis and for interengaging with N+1 radially-extending rounded portions of an orbiter surrounding the inner rotor to form N+1 sealed variable volume chambers therebetween, wherein the fluid windows orbit about the fixed longitudinal axis;
• selectively expanding some of the sealed volume chambers by providing a pressure differential between the sealed volume chambers to produce a rotary motion of the inner rotor, thereby driving an output shaft interengaged with the rotor;
• withdrawing through the fluid windows of the revolving valve means the fluid from the sealed volume chambers that have reached their maximum expansion;
• and
• exhausting the fluid from the motor housing.