A piston pump, in particular for a motor vehicle, includes a piston that is movably mounted in a housing. The piston pump further includes a linear actuator for moving the piston in a first direction. The piston pump further includes a return spring for moving the piston in a second direction. The end face of a first end of the piston delimits a first pressure chamber that is associated with a first hydraulic circuit. The end face of a second end of the piston delimits a second pressure chamber.

Vibrating pump with a secondary closed circuit designed for the recovery and reinjection of the fluid that can eventually escape from the compression chamber and which, if not collected, would end up in the force chamber affecting the drive elements (springs, magnetic core) and therefore the proper functioning and useful life of the pump.

An electrical pump drive for positive displacement pumps having pistons moved in an oscillating manner. The electrical pump drive has a rotary magnet which has at least one electromagnet and an armature which can swivel about an axis and which is pivotable alternately between two working points by means of excitation of the at least one electromagnet. The armature is configured for coupling to a piston which is moved in an oscillating manner.

A pump device, in particular for a brake system of a motor vehicle, includes two hydraulic chambers, a linear drive, and a pump piston. Each of the chambers has at least two fluid connections. The pump piston interacts with the chambers. The linear drive is embodied as a reluctance drive and includes a longitudinally movable armature, a housing-fastened stator that is configured to receive current, and at least one spring element. The at least one spring element is associated with the armature, and is configured to counteract a drive force of the reluctance drive. The armature is connected to the pump piston.

A controller of an electromagnetically driven reciprocating pump influences velocity of the magnetic armature by switching voltage applied to the electromagnet depending on the position of the magnetic armature, its position determined from state variables of the electromagnet. A processor calculates electrical resistance of the magnetic coil from the voltage and current measured by the measuring device, and calculates the temporal change of the linked magnetic flux in the electromagnet from the electrical voltage, the current and the resistance of the magnetic coil, and calculates the linked magnetic flux in the electromagnet from an earlier magnetic flux and from the temporal change, and determines the position of the magnetic armature from the linked magnetic flux in the electromagnet and the electrical current through the magnetic coil, and switches the voltage at the magnetic coil by the switching device depending on the position of the magnetic armature.

A double-membrane pump has a pump housing and at least a first electromagnet associated with the pump housing. Magnet action elements that are ferromagnetic or permanent-magnetic elements or at least a second electromagnet associated with first and second membranes are alternately attracted or repelled by the first electromagnet, in contact-free manner. The ferromagnetic or permanent-magnetic elements may be metal bodies connected with the membranes or flexible metal layers associated with the membranes. The first-electromagnet may have first and second magnetic coils that can be operated independently of one another and that can influence the first and second membranes independently of one another.

A constant-volume metering pump includes a pump body, a solenoid device, and a piston pump inside the pump body. The solenoid device includes an armature, and the piston pump includes a sleeve, a piston, an inlet valve, and an outlet valve. The sleeve includes an inner sleeve bore. The inner sleeve bore conforms with the external surface of the piston and can slide freely. The piston pump divides the interior pump body into a low-pressure space and a pressure feed space. Liquid enters the pressure feed space from the low pressure space through the inlet valve and is output through the outlet valve, wherein the sleeve connects with the armature and keeps synchronous reciprocating motions. The solenoid-driven device drives the sleeve to perform a motion relative to the piston, causing output of liquid. The output quantity of liquid due to such relative motion is defined by the geometric construction.

An electromagnetic pump for pumping an electrically conductive liquid, including a first conduit section and a second conduit section. The electromagnetic pump further includes a current generator arranged to provide an electric current through the liquid in the first conduit section and the liquid in the second conduit section such that a direction of the electric current is intersecting the flow of the liquid in the first conduit section and in the second conduit section, and a magnetic field generating arrangement arranged to provide a magnetic field passing through the liquid in the first conduit section and the second conduit section such that a direction of the magnetic field is intersecting the flow of the liquid and the direction of the electric current.

The invention relates to a dosing device comprises a fluid-side module (12,12) and a dry module (13), the fluid-side module (12,12) comprises a chamber (14) and a magnetic piston (16) which is drivingly moved into the chamber (14) by a magnetic drive, the piston is penetrated by a channel provided with a seal (20,56). The magnetic drive for the magnetic piston (16) is arranged in the dry module (13).

A feed pump (10), especially fuel feed pump for a vehicle heater, includes a pump piston (36) movable to and fro in a pump chamber (72). The pump piston ejects and receives fluid. A driving arrangement (30) drives the pump piston (36). The driving arrangement (30) includes at least one driving element (28) made of magnetic shape memory material.