Abstract: The invention relates to a piston machine comprising two (or more) housing parts (3a, 3b), which are each in the shape a circular cylinder segment, but which are joined to each other in such a way that the housing parts are rotated 180° with respect to each other, and which enclose a common cavity and each have a dual piston plate (1, 2), wherein the dual piston plates are associated with the respective housing part and driven separately and synchronously in opposite directions. The dual piston plates, together with the respective adjacent angled side wall (15, 16) of the housing part, the side wall having inlet and outlet valves (18a/b, 19a/b), define two outer working chambers (A1 and A2) and one (or more) inner working chambers (A3) are defined between the dual piston plates (1, 2), the one or more inner working chambers having inlet and outlet valves (18c, 19c) formed in a rear housing wall (13) at the height of an imaginary separating line X between the housing parts (3a, 3b).

Abstract: A rotating cylinder includes a cylinder body, a piston, a piston shaft assembly, a main body and a guiding assembly. The cylinder body defines a receiving chamber. The piston, the piston shaft assembly, the main body and the guiding assembly are received in the receiving chamber. The piston shaft assembly is fixed to the piston, and defines at least one guiding groove lengthwise thereof. Each guiding groove includes a spiral portion and an extending portion. The main shaft is non-rotatably connected to the piston shaft assembly away from the piston and exposed out of the cylinder body. The guiding assembly sleeves on the piston shaft assembly and is slidably connected with the at least one guiding groove. The main shaft is driven to rotate when the guiding assembly engages the spiral portion, and move lengthwise when the guiding assembly is slidably connected with the extending portion.

Abstract: The present disclosure presents several embodiments for metering devices some of which also have pumping capability. The devices utilize one or more pistons located within a cylindrical rotor. As the cylindrical rotor is turned by a suitable torque/power source, a first face of each piston is exposed to an inlet supplying a fluid to be metered. The piston is then moved within the associated channel or bore within the rotor, allowing the volume of the channel to be filled with fluid. The continuing rotation of the rotor then removes the piston from the fluid supply and moves the channel through an angular displacement. The piston is then moved—either through applied power for active pistons or the force of the fluid supply for passive pistons—in the opposite direction, forcing the fluid out of the channel. In this way, a precise amount of fluid can be metered from each channel.

Abstract: An improvement to the Nelson Flywheel Power Plant comprising a piston (100 and 101) in each outer chamber (40 and 41) situated at the interface of the compressible fluid and incompressible fluid (120) and slidably adjoining the center shaft (14) and rotatable housing (10). A method of using the improvement comprising the steps of introducing a compressed fluid along a path (110) that acts on one of the pistons (100) to move the incompressible fluid along a path (120); then moving the spool (15) to permit return of the incompressible fluid; and then introducing a compressed fluid to act on the other piston (101) to return the incompressible fluid.

Abstract: A fluid motor has a rotor mounted within a housing internal space. A piston positioned within the rotor and may be mounted to an output shaft. The output shaft is driven by applying pressure difference from a fluid both across the rotor within the internal space and across the piston so as to bias the rotor against the housing and produce a camming action to rotate the rotor.

Abstract: In a preferred embodiment, a fluid-operated cylinder to provide both linear and rotary motion to tooling, including: a cylindrical, rotatable member for attachment to rotatable means; a circular piston disposed in the cylindrical, rotatable member for back and forth axial motion in a cavity defined therein and rotatable by rotation of the cylindrical, rotatable member; a first port defined through the cylindrical rotatable member to introduce pressurized fluid into the cavity on a first side of the circular piston such as to cause the circular piston to move in a first direction; and a piston shaft fixedly attached to the circular piston and fixedly attachable to the tooling; whereby: when the rotatable member is rotated, rotary motion will be transmitted to the tooling by the piston shaft, and when the pressurized fluid is introduced into the cavity on the first side of the circular piston, the piston shaft will cause the tooling to move in the first direction.

Abstract: An actuator has a cylinder centered on an axis and a piston axially displaceable in the cylinder, defining therein axially opposite front and rear compartments, and having an axially rearwardly projecting stem. A distributor is axially fixed but rotatable about the axis on the stem offset from the cylinder. The piston and distributor are formed with passages for pressurizing and depressurizing the compartments. At least one control element is fixed on the distributor offset from the cylinder. A sleeve coaxially surrounds the piston stem and forms a rear abutment against which the piston engages in a rearmost position of the piston. Formations on the cylinder and on the sleeve can axially displace the sleeve on the cylinder and fix the sleeve on the cylinder in any of a multiplicity of axially offset positions thereon. Respective front and rear control members extending axially rearward from front and rear bearings on the cylinder and sleeve are engageable with the control element to operate same.

Abstract: An hydraulically powered rotary actuator for rotating a first portion of a work machine relative to a second portion of the work machine has inner and outer rings enclosed by first and second cover plates. The inner and outer rings are spaced apart to define an hydraulic power chamber to which pressurized fluid is supplied to rotate one of the inner or outer rings. The first portion of the work machine is connected to the rotatable ring and rotates with it. A large diameter bearing assembly rotatably supports the rotatable ring and the first portion of the work machine. Most prior work machines with rotatable car or upper structure require large expensive components including gear reduction assemblies, an hydraulic motor, and large diameter swing gear. The subject actuator simplifies the construction by eliminating many of the prior components.

Abstract: A rotary internal combustion engine is described and shown having two piston and cylinder assemblies rotating about a single axis. The pistons reciprocate in rotating cylinders having a four cycle internal combustion engine process to receive air and fuel, to compress the air and fuel, to combust the mixture and to exhaust the gases therefrom. The pistons move in a set relation to each other, being connected by a common rod. The center of rotation of the pistons is dynamic relative to the center of rotation of the cylinders and cylinder blocks. Intake and exhaust valves are positioned about the periphery of the rotor assembly, and have staggered opening and closing schedules in order that air and fuel may be admitted and gases scavenged in accordance with the four cycle internal combustion engine principle.

Abstract: A two stroke mechanism is described which has rotary moveable piston and cylinder-piston elements. The piston and cylinder-piston elements both rotate within a stationary body forming two variable volume chambers. The first variable volume chamber formed between the piston and cylinder-piston elements may serve as a combustion or compression chamber. The second variable volume chamber formed around the piston and cylinder-piston elements and within the stationary body may serve as a precompression chamber. Methods for balancing, sealing, intake, discharge and cooling such mechanisms are disclosed. The mechanisms are especially useful as internal combustion primer movers, external combustion prime movers, pumps and compressors.

Abstract: An internal combustion engine wherein a piston element with rectilinear sides operates within a movable cylinder-piston element having rectilinear sidewalls, and wherein the combustion chamber has a polyhedral shape. Rotatable crankshafts are mounted in each of the piston and cylinder-piston elements so that said elements follow gyratory paths in opposite directions to effect a variable volume combustion chamber. A cylindrical valve member is rotated in timed sequence to the rotation of the crankshafts so that intake and exhaust ports are sequentially opened and closed during the combustion cycles. One or both of the crankshafts may operate or be joined to a drive shaft or shafts for work output, said crankshafts being interconnected by gear means to coordinate gyratory movement of the piston and cylinder-piston elements.