Disclosed is a pump for dispensing lubricant to a system. The pump includes: a housing having an inlet for inputting lubricant into the housing and an outlet for delivering the lubricant therefrom. A control slide is pivotable about a pivot pin within the housing in a displacement increasing direction and a displacement decreasing direction to adjust pump displacement. A resilient structure biases the control slide in the displacement increasing direction. A pressure relief valve is mounted to the pivot pin and positioned along an outflow path leading pressurized lubricant from the control slide to the outlet. The pressure relief valve is biased in a closing direction and has a pressure receiving surface receiving pressure from the lubricant in the outflow path to urge the pressure relief valve in an opening direction. Opening the relief opening allows outflow of lubricant to relieve pressure in the outflow path.

A pump assembly that has a first pump and a second pump for pumping lubricant, both pumps being integrated into a single housing. A drive shaft is provided that drives both pumps. Both the first pump and the second pump have a gear or rotor that is rotated by the drive shaft. Each of the pumps have an inlet provided on the housing to receive input from a source outside the housing and an outlet. The housing has a wall that is common to both pumps. The first pump is provided on a first side of the wall and the second pump is provided on the second, opposite side. The gears or rotors of the pumps may be provided in pockets provided on the first and second sides of the wall. The drive shaft extends through the wall and connects to each of the drive gears or rotors.

Disclosed is a vane pump including a housing, a pivot pin having a hollow portion mounted within the housing, a control slide displaceable about the pivot pin within the housing between a first slide position and a second slide position to adjust displacement of the pump through an outlet, and a cover attached to the housing via a fastener passing through the pivot pin such that the control slide rotates about the pivot pin with respect to the housing and the cover. In an example, the fastener passes through to the engine mount. The pivot pin does not create a fluid path through the hollow portion.

A gerotor or pump or gear device includes a stationary housing having a chamber with an outer ring gear and inner rotor. The outer ring gear is supported by rolling elements between the housing and outer ring gear and is rotatable about a center axis. The inner rotor is fixed to a shaft and rotatable therewith about a shaft axis that is offset or eccentric relative to the central outer ring gear axis.

A radial vane pump or motor device includes a stationary housing provided with a cylinder supported for rotation relative to the housing about a central axis. A rotor is fixed to a shaft for rotation with the cylinder about an axis offset or eccentric relative to the central axis. A plurality of vanes slide radially in the rotor for contact with the inner surface of the cylinder.

This disclosure generally relates to an automatic bicycle, particularly to a hydraulic automatic transmission bicycle which can automatically and adaptively change gear ratios. More particularly, this disclosure relates to those hydraulic automatic transmission bicycles which use fluid pressure to change such gear ratios, and which include various hydraulic automatic transmissions which may be provided in various configurations and may operate in various methods and sequences to provide automatic and infinitely variable gear ratios.

A delivery element for a rotary pump is proposed which is formed in one part from a metallic material, wherein the delivery element includes at least one first surface and at least one second surface which differ from each other, at least in regions, in at least one material property. A method for manufacturing a delivery element in accordance with the invention, a rotary pump including at least one delivery element in accordance with the invention, and the use of a delivery element in accordance with the invention in a rotary pump is also proposed.

The present invention is directed to providing a pump capable of achieving improvement of a discharge efficiency. A pump configured to suck and discharge fluid includes a housing, a driving shaft rotatably supported on the housing, and a pump element contained in the housing and configured to be rotated by the driving shaft. The housing contains therein an intake passage into which the fluid delivered from outside the housing is introduced, an intake port configured to guide the fluid from the intake passage to the pump element, a discharge port into which the fluid pressurized by the pump element is introduced, and a discharge passage configured to discharge the fluid delivered from the discharge port to outside the housing. The discharge passage includes a first passage including a beginning portion connected to the discharge port and a termination portion. The first passage extends as far as the termination portion around one straight line. The discharge passage further includes a second passage connected to the termination portion of the first passage and opened to outside the housing. A shape of the first passage in cross section taken along a direction perpendicular to the straight line changes continuously from the beginning portion to the termination portion.

A powered compressor oil pump that can be secured to a container with oil to transfer oil into a compressor or other system needing oil. The powered compressor oil pump includes a shaft that can be rotated to drive a pump mechanism such as a rotor pump mechanism. The shaft is configured to be rotated using an electrically or pneumatically powered rotary source such as a powered hand drill. The pump can be easily and securely mounted directly onto the neck of the oil container using an interface assembly or alternatively held in place using an intake pipe grip.

To provide a rotor portion 2A; a cam ring 21 having a rotor chamber 21a; a pump housing 1 provided with a pump chamber 11 having a control chamber 12 where the cam ring 21 is movably arranged to move the cam ring 21 using an oil pressure; a spool valve A for controlling the cam ring 21; a solenoid valve 81; and a relief valve 83. Each valve housing is provided with a communication hole 7 for supplying oil from the control chamber 12 of the pump chamber 11 to a portion between the control chamber 12 and at least one of the valve housings. A through-hole for discharging the oil is formed in the valve housing.