A wave energy isolation device includes a fixed displacement hydraulic motor and a variable displacement hydraulic pump. The variable displacement hydraulic pump outputs a working fluid to the fixed displacement hydraulic motor. The variable displacement hydraulic pump changes an output displacement of the working fluid according to a control parameter.

An electronic angle adjustment mechanism for a pump and a motor generally includes a base and an actuating motor. The base has an upper portion mounted to a motor, a lower portion mounted to a pump, and a hinge for pivotably moving the upper base portion in relation to the lower base portion. The actuating motor is mounted on an attachment plate that is attached to the upper base portion. The actuating motor is connected to a worm screw that engages an arcuate member attached to the lower portion to pivot about the hinge and change the angle between the upper and lower base portions.

An electronic angle adjustment mechanism for a pump and a motor generally includes a base and an actuating motor. The base has an upper portion mounted to a motor, a lower portion mounted to a pump, and a hinge for pivotably moving the upper base portion in relation to the lower base portion. The actuating motor is mounted on an attachment plate that is attached to the upper base portion. The actuating motor is connected to a gear wheel that engages an arcuate member attached to the lower portion to pivot about the hinge and change the angle between the upper and lower base portions.

A variable displacement axial piston pump including a cylinder block defining a plurality of cylinder bores, each receiving a piston. A swash plate having a piston-supporting surface is pivotally supported relative to the cylinder block. A port block defines first and second pumping ports arranged in fluid communication with the plurality of cylinder bores such that, during operation of the pump, one of the first and second pumping ports is configured to supply fluid to the cylinder bores for pumping, and the other of the first and second pumping ports is configured to receive fluid pumped from the plurality of cylinder bores. The swash plate partially defines at least one variable volume control chamber, and the swash plate is operable to tilt with respect to the port block in response to a fluid pressure change in the at least one control chamber.

The present invention is directed to an improved liquid additive injection pump that of a type wherein a variety of additive volumes may be metered into a fluid stream or fluid source by adjusting the plunger stroke with an easily accessible adjustment bushing without changing or interrupting, the power supplied to the pump during operation. A robust roller bearing drive is used to power the plunger(s) providing fluid suction and discharge as the plunger(s) cycle, while ensuring accurate and reliable additive injection rates. A spring energized seal eliminates overtightened packing by field technicians. An easily accessible adjustment bushing allows the user to modify the piston stroke length, thereby increasing, decreasing or stopping the volumetric flow of injected additive into a fluid stream or storage container.

A crank-piston mechanism for a reciprocating double-acting piston-type gas compressor that allows for infinitely variable compression ratios during operations. The mechanism includes a gear pin crankshaft, a forward piston-connecting rod, a rearward piston-connecting rod, a forward crosshead, a rearward tubular crosshead, and a tandem piston assembly. The forward piston-connecting rod and the rearward piston-connecting rod are each rotatably connected to the gear pin crankshaft about two parallel but offset axes. On the opposite end, the forward piston-connecting rod and the rearward piston-connecting rod are connected to the forward crosshead and the rearward tubular crosshead, respectively. Wherein, the forward crosshead is slidably mounted within the rearward tubular crosshead. The forward crosshead is connected to a forward piston from the tandem piston assembly and the rearward tubular crosshead is connected to a rearward piston from the tandem piston assembly. The forward piston and the rearward piston are aligned for reciprocating motion.

A crank-piston mechanism for a reciprocating double-acting piston-type gas compressor that allows for infinitely variable compression ratios during operations. The mechanism includes a gear pin crankshaft, a forward piston-connecting rod, a rearward piston-connecting rod, a forward crosshead, a rearward tubular crosshead, and a tandem piston assembly. The forward piston-connecting rod and the rearward piston-connecting rod are each rotatably connected to the gear pin crankshaft about two parallel but offset axes. On the opposite end, the forward piston-connecting rod and the rearward piston-connecting rod are connected to the forward crosshead and the rearward tubular crosshead, respectively. Wherein, the forward crosshead is slidably mounted within the rearward tubular crosshead. The forward crosshead is connected to a forward piston from the tandem piston assembly and the rearward tubular crosshead is connected to a rearward piston from the tandem piston assembly. The forward piston and the rearward piston are aligned for reciprocating motion.

A pump assembly comprises a base, a cam, a cylinder, a piston, and a shim clip. The cam rotates about a rotational axis with respect to the base. The cylinder attaches to the base, and has an inlet port and an outlet for fluid. The piston is reciprocally driven by rotation of the cam to draw fluid into the cylinder through the inlet port during a fill stroke, and to close the inlet port and pump fluid in the cylinder toward the offset during a pump stroke. The shim clip is removably insertable between the cylinder and the base to increase the distance between the inlet port and the rotational axis.

An electronic angle adjustment mechanism for a pump and a motor generally includes a base and a linear actuator. The base has an upper portion mounted to a motor, a lower portion mounted to a pump, and a hinge for pivotably moving the upper base portion in relation to the lower base portion. The linear actuator is mounted to on an attachment plate that also attaches the motor to the upper base portion. The linear actuator can drive a flexible member or connect to a gear wheel or worm screw to pivot about the hinge and change an angle between the upper and lower base portions.

A membrane fluid pump includes a rotatable drive shaft. The shaft is equipped with a number of eccentrics arranged axially along the shaft. The membrane fluid pump further comprises a set of connecting rods connected to each of the eccentrics. Each connecting rod is attached between one of the eccentrics on the shaft and a corresponding membrane so that each of the connecting rods is arranged to transfer a rotating movement of the shaft to a reciprocating movement pattern of the corresponding membrane. Each of the eccentrics and the connecting rods are arranged such that all of the membranes will reciprocate with a phase shift evenly distributed over a 360 degree rotation of the drive shaft, and wherein all of the eccentrics are rotationally offset to each other with an angle so that they are evenly distributed over a 360 degree rotation of the drive shaft.