A fuel pump includes a holed disk-shaped plate and a coil spring to press the plate toward a lifter. The plate has an inner circumferential surface to be engaged with a groove in a projection-side end portion of a plunger. Also, a joint port that connects the inner peripheral surface of the plate to an outer peripheral surface thereof is provided in the plate. The coil spring is located between the plate and a pump body. The plate is assembled in the fuel pump to dispose the joint port at a position in an opposite direction to the direction of a side force to be generated during compression of the coil spring when viewed from a central axis of the coil spring.

The invention relates to a cam mechanism for converting a swiveling movement of a drive-side shaft into a linear output movement, comprising a cam disk that can attached to the drive-side shaft, a slider that can be shifted in a linear guide at least in sections, and a cam follower which is applied against the circumferential surface of the cam disk, so that a swiveling movement of the cam disk leads to a linear output movement of the slider in the linear guide, wherein the circumference of the cam disk is designed as spiral-shaped at least in sections, and the radius of the cam disk increases monotonically in the spiral-shaped section from a start radius R.sub.1 to an end radius R.sub.2 along a swiveling direction. By selecting two reversal points within the spiral-shaped section, the setting of a variable stroke can occur. The invention further relates to a piston pump with such a cam mechanism as well as to a method for using the cam mechanism and the piston pump.

An oil lubricated common rail diesel pump includes a pumping assembly and a drivetrain assembly. The pumping assembly includes a pump housing and a plunger mounted along a pumping axis. The drivetrain assembly includes a driveshaft and a cam mounted within a first chamber of a drivetrain housing. The plunger is arranged for reciprocating linear movement along the pumping axis within a second chamber of the housing upon rotation of the cam. The drivetrain assembly also includes a guide mounted within the housing between the cam and the plunger and being adapted to receive a cam follower. At least the housing is adapted to be substantially filled with oil in use and the guide includes at least one flow passage communicating between the first chamber and the second chamber.

A plug-in pump includes a cylinder and a pump housing, wherein the cylinder has a cavity in which a movable piston is accommodated, wherein a first end of the piston delimits a pump chamber, and a second end of the piston is connected to a drive device for the piston. An inlet valve is arranged in the cylinder, which inlet valve connects the pump chamber to a feed line for a first fluid, and an outlet valve connects the pump chamber to an outlet. The pump housing has a cavity that forms a first chamber connected to a feed line for the first fluid, and at least one second chamber which is separated from the first chamber and which is connected to a fluid system of a second fluid. The first chamber is fluidically sealed off with respect to the second chamber.

A pump cartridge comprises a retention structure to retain a piston for shipping and storage, in which the piston can be decoupled from the retention structure to pump fluid. In the shipping and storage configuration, the piston can be positioned with the retention structure to allow sterilization gas to travel within a housing and into a cylinder distal to the piston. When placed in the console for use in a pumping configuration, the piston can be decoupled from the retention structure to form a seal within the housing. When the procedure has been completed, the pump cartridge can be decoupled from the console in a manner that disables the cartridge for subsequent use to prevent a non-sterile cartridge from being reused.

A pump system includes a first pump and a second pump each having a plunger assembly. The plunger assembly includes a crosshead, a plunger, and a sleeve. The sleeve at least partially surrounds the plunger and an end of the crosshead. The sleeve is configured to create a fluid seal between the plunger and the crosshead.

A lubrication pump includes a housing defining a bore, an adjustable cylinder sleeve within the bore, and a piston slidably movable within the bore along a longitudinal axis of the bore. A connector may be drivingly interposed between a cam and the piston for driving the piston in reciprocating axial motion. The connector may have a coupling for engaging the piston, which may enable rotational engagement between the connector and the piston. The connector may have a roller for bearing engagement with the cam, which may enable the connector to rotate about the longitudinal axis relative to the housing as the connector moves axially within the bore. The cam may be laterally displaceable relative to the connector. The cylinder sleeve may be adjustable relative to the piston for varying lubricant fluid output flow. The cylinder sleeve and corresponding piston may be interchangeably disposed in the housing.

A foam pump for generating a foam comprising a foamable liquid and air has dual, coaxial air and liquid cylinders, each having a respective air and liquid piston which move together during a dispensing operation. In certain embodiments, the air and liquid cylinders are modular, separately formed components. In certain embodiments, a plurality of differently sized, liquid cylinders are provided, each with a corresponding liquid piston which is complementary in size thereto. Providing multiple differently sized liquid cylinder and piston components allows the pump to be configured to deliver a desired quantity of foamable liquid and/or a desired liquid-to-air ratio in the foam output of the pump. The differently sized liquid cylinder and piston components can be used interchangeably with a common air cup design and other common pump components, the modular construction allowing custom pump output configurations to be provided with minimal tooling investment per output size.

A high-pressure fuel pump actuator used in an engine, which is used in a fuel injection system of an engine, is mounted on between a driving cam and a fuel pump plunger. The pump actuator includes a guide sleeve, a U-shaped holder, and a pin shaft roller set. The U-shaped holder is formed by stamping the steel plate integrally. The guide sleeve uses a special windowing manner. Both ends of the pin shaft do not need riveting. The structure of the present invention has less number of parts and integrated functions, which can notably reduce the entire weight, the inertial force, the friction, and the abrasion. The operation is steady. The efficiency of the engine is improved.

A roller tappet includes a roller and a roller shoe in which the roller is rotatably mounted. The roller shoe has a first lateral surface with a recess for receiving the roller, a second lateral surface opposite the first lateral surface, and a third lateral surface between the first and second lateral surfaces. The third lateral surface and at least part of the second lateral surface are each curved.