The present application discloses a compressor including a crank shaft, a first reciprocation converter, a first cylinder body, a first pressurizing portion, a second reciprocation converter, which is connected to the crank shaft with a phase different by 180 degrees from the first reciprocation converter, a second cylinder body, a second pressurizing portion, and a connecting portion configured to interconnect the compression chambers. The compression chambers are arranged so that a timing at which the gas is discharged from a specific compression chamber among the compression chambers becomes the same as a timing at which the discharged gas is suctioned into another compression chamber at a higher side by one stage than the specific compression chamber.

A natural gas compressor can include a pre-staging chamber that couples with a supply line to receive natural gas from the supply line. The compressor can additionally include a first-stage chamber that couples with the supply line to receive natural gas from the supply line. The first-stage chamber can additionally be coupled with the pre-staging chamber to receive from the pre-staging chamber natural gas that has been compressed by the pre-staging chamber. The compressor can also include a second-stage chamber configured to receive natural gas that has been compressed by the first-stage chamber.

A natural gas compressor can include a pre-staging chamber that couples with a supply line to receive natural gas from the supply line. The compressor can additionally include a first-stage chamber that couples with the supply line to receive natural gas from the supply line. The first-stage chamber can additionally be coupled with the pre-staging chamber to receive from the pre-staging chamber natural gas that has been compressed by the pre-staging chamber. The compressor can also include a second-stage chamber configured to receive natural gas that has been compressed by the first-stage chamber.

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 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 variable pressure air pump includes a first cylinder and a second cylinder movable relative to the first cylinder along a longitudinal axis. An air tube is mounted in the first and second cylinders. A mounting portion is integrally formed on a first end of the air tube. A first piston and a second piston compress air in the first and second cylinders. A connecting device is mounted to the first cylinder for coupling with an object to be inflated. An air escape device selectively seals a second chamber of the second cylinder to selectively compress the air in the second cylinder. A first check valve is mounted to the mounting portion of the air tube. A second check valve is mounted to the second piston.

A method for operating a pressure control system having a multistage compressor includes outputting, by the multistage compressor in order to fill a pressure medium store or pressure medium chambers of the pressure control system, a pressure medium compressed multiple times. Outputting the pressure medium compressed multiple times includes providing, by a first compression stage, a precompressed pressure medium and further compressing, by a second compression stage, the precompressed pressure medium to form a compressed pressure medium and then outputting the compressed pressure medium. Alternatively, outputting the pressure medium compressed multiple times includes providing a compression pressure medium, which is obtained from additional compression of an already compressed charge pressure medium from the pressure medium reservoir or the pressure medium chambers of the pressure control system, wherein the compression pressure medium is output without additional compression by the second compression stage.

A method for operating a pressure control system having a multistage compressor includes outputting, by the multistage compressor in order to fill a pressure medium store or pressure medium chambers of the pressure control system, a pressure medium compressed multiple times. Outputting the pressure medium compressed multiple times includes providing, by a first compression stage, a precompressed pressure medium and further compressing, by a second compression stage, the precompressed pressure medium to form a compressed pressure medium and then outputting the compressed pressure medium. Alternatively, outputting the pressure medium compressed multiple times includes providing a compression pressure medium, which is obtained from additional compression of an already compressed charge pressure medium from the pressure medium reservoir or the pressure medium chambers of the pressure control system, wherein the compression pressure medium is output without additional compression by the second compression stage.

Described is a multi-stage pump having at least two stages. The multi-stage pump includes a first pump stage and a second pump stage each having a chamber of different diameter and volume. The multi-stage pump also includes a plunger having first and second plunger sections. The first plunger section has a first plunger diameter, a first end configured for coupling to a drive mechanism, and a second end opposite to the first end. The second plunger section has a second plunger diameter that is less than the first plunger diameter, a third end in contact with the second end of the first plunger, and a fourth end opposite the third end. Movement of the plunger produces a displacement volume for the first chamber that is different than a displacement volume produced for the second chamber. The multi-stage pump can be configured in different operational modes to provide different flow rates.

Systems are provided for an air compressor system. In one example, a system includes a housing, a piston arranged in the housing, and a crankshaft arranged in the housing, the crankshaft coupled to a connecting rod of the piston, and the crankshaft forces the piston to oscillate from a first end of the housing to a second end, the piston pressurizing air in the housing to a first pressure at the first end and to a second pressure at the second end, the second pressure greater than the first.