Abstract: A driving device for driving a vehicle includes an internal combustion engine, a feed line for feeding combustion air to the internal combustion engine, a discharge line for discharging exhaust gases from the internal combustion engine, a charge air cooler that is arranged in the feed line for cooling the combustion air, and a recirculation line branching off the discharge line for recirculating the exhaust gas from the discharge line into the feed line. The recirculation line includes a bypass line that the exhaust gas can be fed to the internal combustion engine through the charge air cooler and/or bypassing the charge air cooler.

Abstract: Provided is a method for calculating an oxygen concentration in a combustion chamber, including: calculating volume efficiency of the combustion chamber while a variable valve lift is in an on state and the volume efficiency of the combustion chamber and the volume of internal EGR from the volume of the combustion chamber while the variable valve lift is in an off state; and calculating a mass of the internal EGR from the pressure of an exhaust manifold, the temperature of the exhaust manifold, and the volume of the internal EGR.

Abstract: An arrangement for attaching a control valve to a flow channel housing of an internal combustion engine which includes an insertion housing part which projects into the flow channel housing. The arrangement includes an actuator housing, an actuator arranged in the actuator housing, a housing plate which rests on the flow channel housing, screws, and a collar flange which radially surrounds the housing plate. The insertion housing part extends on a first side of the housing plate and the actuator housing extends on a second opposite side of the housing plate. The collar flange comprises a screw hole pattern arranged thereon and through-holes arranged therein. The screw hole pattern corresponds to a connecting bore pattern of the flow channel housing. The control valve is attached to the flow channel housing via the screws being inserted through the through-holes of the collar flange.

Abstract: A ducted combustion system is disclosed. The ducted combustion system may include a combustion chamber and a fuel injector in fluid connection with the combustion chamber and including at least one orifice opening from an injector tip of the fuel injector, the at least one orifice injecting fuel into the combustion chamber as at least one fuel jet. The system may further include at least one duct disposed within the combustion chamber such that the at least one fuel jet, at least partially, enters the at least one duct upon being injected into the combustion chamber. The system may further include a duct cooling system configured to cool a mixture of fuel and air of the at least one fuel jet.

Abstract: An engine includes a breather conduit, an intake conduit, and an air filter assembly. The assembly includes a filter element having a top wall, a bottom wall, a first aperture through the bottom wall, a second aperture through the bottom wall, and filter media extending between the top and bottom walls, wherein the first and second apertures are the same shape, the same size, and are equally spaced apart from the center of the bottom wall. The filter assembly also includes a case. The filter element is configured to be received in the case such that the breather conduit and the intake conduit are directed to and from the interior chamber of the filter element, respectively, whereby air filtered by the filter media mixes with unfiltered gases from the breather conduit in the interior chamber of the filter element prior to entering the intake conduit.

Abstract: A diverter valve consisting of a body, piston, operating mechanism, inlet port, and outlet port. The outlet port is arranged concentric to the center axis of the piston and body, while the inlet port is offset from the central axis. When signaled to open, the valve vents pressurized gas. The offset arrangement of the inlet port and the tapered shape of the piston create a swirl pattern in the gas flow which reduces turbulence and increases flow rate.

Abstract: An apparatus for cooling intake air temperature of a vehicle may include a vortex tube receiving high pressure air discharged from an intercooler of a vehicle and then separating the high pressure air using centrifugation into high temperature air and low temperature air; a first bypass line connecting the vortex tube with a compressor, allowing the low temperature air to move therethrough, and selectively opened/closed by a first check valve; a second bypass line connecting the vortex tube with an exhaust line of the vehicle and allowing the high temperature air to move therethrough as a second check valve is opened/closed; and a controller controlling to open or close the first and second check valves.

Abstract: A fuel filter for a fuel supply system of an internal combustion engine may include a filter housing, which may have an untreated-side inlet, a treated-side outlet, and an untreated-side return line. The fuel filter may also include a filter element arranged in the filter housing, and a closure element, which in an operationally ready state of the fuel filter may close off the return line. The fuel filter may include an untreated space and a treated space, and may separate in the filter housing the untreated space communicating with an inlet and the return line from the treated space communicating with the outlet. The fuel filter may further include a pressure sensor configured to measure a pressure build-up in the treated space, wherein the fuel filter may be configured to enable the pressure build-up to reach a predetermined threshold at which the engine may be started.

Abstract: Injection holes of an injection nozzle are respectively formed such that an inner diameter of an outer opening is larger than an inner diameter of an inner opening. Furthermore, the injection holes are formed such that when an imaginary plane, which includes a valve seat portion that is a portion of a valve seat and is adjacent to the injection hole, is extended toward a central axis, the imaginary plane first intersects with an injection hole inner wall portion of an injection hole inner wall of the injection hole.

Abstract: The oil deflector assembly for a fuel injector is disclosed. The oil deflector assembly includes a first ring disposed around a first extending portion of a case portion of the fuel injector. The oil deflector assembly further includes a second ring disposed around a second extending portion of a body portion of the fuel injector. The second ring includes a first portion engaging with a second step portion of the body portion. The first portion includes an inner surface engaging with the second extending portion of the body portion and an outer surface. A plurality of orifices extends between the inner surface and the outer surface to allow entry of fluid into the fuel injector. A second portion extends from the first portion of the second ring and is received within the first ring.

Abstract: An internally pressurized component is provided that includes a main body having at least one cavity; at least one branch having a bore which runs through the branch into the cavity of the main body; at least one separate insert element which is arranged in frictionally locking fashion at least partially in the bore of the branch. The component, at least in that region of the bore at which the separate insert element is arranged, is formed, by way of an autofrettage treatment, as a compacted wall region, and the separate insert element is arranged with an oversize in the bore.

Abstract: The present disclosure relates to internal combustion engines in general. Some embodiments may include a drive device for a high-pressure fuel pump of an internal combustion engine. It may include an eccentric ring in frictional connection with a drive shaft for converting a rotational movement of the drive shaft about a drive shaft rotational axis into a translational movement; a tappet spaced apart from the eccentric ring for passing on the translational movement from the eccentric ring; and at least two pivoting bodies disposed between the eccentric ring surface and the tappet surface and in contact with the eccentric ring surface and with the tappet surface. The eccentric ring may include at least one flat eccentric ring surface. The tappet may include at least one flat tappet surface. The pivoting bodies may each include a respective extension axis running parallel to the drive shaft rotational axis and pivot about the extension axis.

Abstract: A plunger fuel pump for an internal combustion engine includes a pump cylinder and a pump plunger that is axially displaceable in the pump cylinder. The plunger fuel pump has a seal with an annular basic structure arranged around the circumference of the pump plunger. The seal is produced by injection molding in an axial injection direction.

Abstract: A piston fuel pump for an internal combustion engine includes a pump cylinder and a pump piston, which can be axially displaced in the pump cylinder. The piston fuel pump also includes a seal which is arranged on the periphery of the pump piston. The seal has at least one bump pointing in the axial direction, and the seal axially covers the at least one bump.

Abstract: A piston fuel pump for an internal combustion engine includes a pump cylinder, a pump piston, a seal, and a cover. The pump piston is axially displaceable in the pump cylinder. The seal is arranged on a periphery of the pump piston. The cover is placed on the piston pump to axially maintain a position of the seal, in particular via an axial bias.

Abstract: The present disclosure relates to filters in general, and the teachings may be applied to a filter assembly for use in a fuel injector, the fuel injector, and internal combustion engines. A filter assembly may include: a filter element with a frame having an axial end and a tubular filter housing receiving the filter element. The filter housing may have a side wall with a taper supporting the axial end. The taper may have the shape of a conic section with an opening angle ? of less than 180°. The outer circumferential surface of the frame may include a first section in the section of the taper having the shape of a conic section with an opening angle ? of less than 180°.

Abstract: The present application concerns a fuel-injection metering device for a motor vehicle. The fuel-injection device include a main body with at least one through-hole, whereby the main body forms a valve seat on its inner face that is provided to interact with a valve body, whereby the inner face of the main body is electrochemically machined. The application also concerns a mould, a production method, and a fuel-injection nozzle.

Abstract: A starter device for a work machine may include a ring switch surrounding a housing. The ring switch may be rotatable between a first ring position and a second ring position. A push button may be surrounded by the housing and may be operatively engageable between a first button position and a second button position within the housing. A controller may be in communication with the ring switch and the push button. The controller may be configured to start a prime mover of the work machine when the ring switch is in the second ring position and the push button is operatively engaged from the first button position to the second button position. The controller may be configured to stop the prime mover using delayed shutdown when the ring switch is rotated from the second ring position to the first ring position.

Abstract: An ECU outputs an ignition signal and a discharge waveform control signal. An ignition device closes an ignition switching element in a period during which the ignition signal is input. After a stop of the input of the ignition signal and in a period of input of the discharge waveform control signal, the ignition device controls current flowing through a primary coil to a discharge current command value that is determined by the discharge waveform control signal by opening or closing a control switching element. A discharge control unit determines whether there is an abnormality. When it is determined that there is an abnormality, the ECU avoids control executed by the discharge control unit, and causes the discharge control unit to execute control during times of low-rotation and low-load operation of an internal combustion engine in order to determine whether the discharge control unit has returned to a normal state.

Abstract: An engine control system and method of reducing knocking combustion in a spark-ignited internal combustion engine having exhaust gas recirculation by controlling engine timing based on detection of a misfire in an engine cylinder. The engine control system determines a number of combustion cycles indicative of an amount of time that will pass before misfire gas from the detected misfire will be recirculated to a combustion chamber of any cylinder of the internal combustion engine, and the engine control unit reduces or prevents knocking combustion by adjusting the ignition timing of at least one subsequent combustion cycle after the determined number of combustion cycles have occurred since the misfire was detected.

Abstract: In one aspect, a method for controlling operation of an internal combustion engine is described. The engine is operated in a skip fire manner such that selected skipped working cycles are skipped and selected active working cycles are fired to deliver a desired engine output. A particular level of torque output is selected for each of the fired working chambers. Various methods, arrangements and systems related to the above method are also described.

Abstract: An ignition system for use with an engine is disclosed. The ignition system may have a pre-combustion chamber in fluid communication with a combustion chamber associated with the engine, and a fuel injection device configured to inject a fuel mixture directly into the pre-combustion chamber. The ignition system may also have a spark plug configured to ignite the fuel mixture within the pre-combustion chamber, and a controller in communication with a primary energy supply and an enhanced energy supply. The controller may be configured to direct a first current from the enhanced energy supply to the spark plug after the fuel mixture is injected into the pre-combustion chamber. The controller may also be configured to direct a second current from the primary energy supply to the spark plug just after the first current is being directed to the spark plug. The second current may have a frequency that is lower than the first current.

Abstract: The invention relates to a submersible power plant. The power plant comprises a structure and a vehicle. The vehicle is arranged to be secured to the structure by means of at least one tether. The vehicle is arranged to move in a predetermined trajectory by means of a fluid stream passing the vehicle. The vehicle comprises a first wing and a second wing, where the first wing is arranged at a first distance D1 from the second wing in a longitudinal direction, and the first wing is arranged at a second distance D2 from the second wing in a lateral direction.

Abstract: A wave energy converter includes a surface float including a non-axisymmetric profile, a reaction plate configured to be submerged below a water surface, and more than one flexible tether, each mechanically coupled to both the surface float and the reaction plate, the reaction plate having a moment of inertia in pitch and roll greater than a moment of inertia in pitch and roll of the surface float.

Abstract: A wave energy plant that includes a semi-submersible platform provided with at least one longitudinal casing that extends from a bow to a stern of the platform and a wave energy machine mounted on the platform. The machine includes a gantry transversely mounted on the casing on the bow of the platform, floats are arranged so as to enable the wave energy to be converted into mechanical energy, i.e. at least one primary float and at least one secondary float, longitudinally offset relative to the primary float and a transformer. The platform includes at least one stabilizer aileron extending transversely within the lower edges of the casings of the platform.

Abstract: A turbine comprises a shaft (20), a mass (10) eccentrically mounted for rotation about shaft (20), having its center of gravity at a distance from the shaft (20) and a motion base (15). Motion base (15) rigidly supports the shaft (20), and is configured for moving the shaft (20) in any direction of at least two degrees of movement freedom, except for heave. A floating vessel-turbine (120), encloses entirely the eccentrically rotating mass (10) and the motion base (15). The turbine converts ocean wave energy into useful energy, very efficiently.

Abstract: An airfoil blade assembly including a blade which includes a lift generating section with a first profiled body defined between a pressure surface and a suction surface. The first profiled body extends from a first leading edge to a first trailing edge with a first chord extending form the first leading edge to the first trailing edge and being perpendicular to the radial direction. At least one flow deflector extends along either the pressure surface or the suction surface within the lift generating section of the blade. The at least one flow deflector defines a second profiled body extending between a second leading edge and a second trailing edge with a second chord extending between the second leading edge and the second trailing edge. The second profiled body defines an outer surface facing away from respective pressure surface or suction surface along which the flow deflector extends.

Abstract: A fluid turbine is provided, comprising a rotor with a rotation axis and at least two rotor blades arranged within a housing, wherein a top and a bottom of the housing are arranged essentially perpendicular to the rotation axis, wherein the rotor is rotatable relative to the housing, and wherein at least one support element is arranged between the top and the bottom of the housing. Due to the at least one support element, the fluid turbine has particularly high efficiency.

Abstract: A wind turbine for harvesting energy from both horizontal and vertical wind currents having an open frame structure and a central passage through the structure with at least three wind energy harvesting generally vertically disposed and rotatably mounted blades positioned about the central passage and at least three wind energy harvesting generally horizontal blades projecting radially from the central vertical axis of the device. The open frame structure includes a unique rod and cable central structure offset from the periphery of the frame. In one embodiment, the frame structure is suspended from a rotatable hub at the top of a stationary mast.

Abstract: A method for controlling the operation of a wind turbine which includes a mechanical drive train, an electric generator being mechanically connected to the drive train, and a power converter being electrically connected to the generator is provided. The method comprises (a) determining a frequency of an AC output voltage signal provided by the power converter; (b) recognizing, whether there has been a modification of the determined frequency with respect to a previously determined frequency, which modification is larger than a given threshold; (c) if the modification of the determined frequency is larger than the given threshold, changing a power reference signal for the wind turbine; (d) providing the changed power reference signal to a controller of the wind turbine; and (e) controlling the operation of the wind turbine on the basis of the changed power reference signal.

Abstract: A method of detecting a fault mode of a sensor is provided. The sensor may be, for example, a bending moment sensor and may sense a bending moment of a blade on a wind turbine generator (WTG). The method includes comparing data output by a first sensor with reference data indicating what is expected to be output by the first sensor to produce a first comparison result and comparing data output by the first sensor with data output by a second sensor to produce a second comparison result. A determination of whether the first sensor has entered a fault mode is made based at least in part on the first and second comparison results.

Abstract: A wind park comprising at least two wind turbines that produce electrical power by means of a wind rotor and a generator and delivers this to an accumulating network, and comprising a park master that is configured to control said wind turbines and has a power regulator whose input is supplied with a target power signal and, at whose output, power control signals are emitted for the wind turbines, said power regulator comprising a feed-forward control module that imposes a value for the target power onto the output of said power regulator by means of a multiplication element.

Abstract: A flywheel includes a shaft a rotor attached to the shaft. The rotor rotates using the shaft as a central axis. The rotor includes at least one magnet along an outer circumferential surface thereof, at least one coil spaced apart from the rotor in a radial direction. The coil may form a magnetic field that exerts a magnetic force on the magnets when current is supplied to the coil by an electric circuit, thus mitigating fluctuations in rotation of the rotor.

Abstract: The wind generator includes a support part, a housing connected to an upper portion of the support part, the housing having an inner space, a blade part connected to one side of the housing, the blade part, an electricity generating part seated in the inner space of the housing, a flywheel, and a tail part. The flywheel includes a shaft rotating together with the blade part, a rotor coupled to the shaft, the rotor including at least one permanent magnet along an outer circumferential surface thereof, at least one coil part disposed outside in a radial direction of the rotor and around which a trigger coil is wound, the at least one coil generating magnetic fields when current is supplied to the trigger coil, and a circuit part supplying pulse-type current to trigger coil when the permanent magnet passes through a center of the trigger coil.

Abstract: A method for controlling the operation of a wind turbine is provided. The method includes (a) receiving an active power reference signal) and an active power feedback signal; (b) determining, based on the active power reference signal and the active power feedback signal, a first voltage control signal and a power controller frequency signal; (c) determining, based on the power controller frequency signal, a second voltage control signal; (d) determining, based on the frequency reference signal, a frequency controller frequency signal; (e) determining, based on the power controller frequency signal and the frequency controller frequency signal, an actual angle signal being indicative for an actual angle of a rotating dq reference frame; and (f) controlling the operation of a power converter of the wind turbine based on the first voltage control signal, the second voltage control signal, and the actual angle signal.

Abstract: A method for controlling the operation of a wind turbine is provided. The method includes receiving, by means of a power controller, an active power reference signal and an active power feedback signal; determining, by means of the power controller and based on the active power reference signal and the active power feedback signal, a first voltage control signal and a power controller frequency signal; determining, by means of a frequency droop gain unit and based on the power controller frequency signal, a second voltage control signal; determining, by means of a theta integrator unit and based on the power controller frequency signal, an actual angle signal being indicative for an actual angle between a rotating dq reference frame and a stationary abc reference frame; and controlling operation of a network bridge based on the first voltage control signal, the second voltage control signal, and the actual angle signal.

Abstract: A method is provided for controlling the operation of a wind turbine includes (a) receiving an active power reference signal; (b) determining, based on the active power reference signal and an active power feedback signal, a first voltage control signal and a power controller frequency signal; (c) receiving a power reference signal; (d) determining, based on the power reference signal and the power feedback signal, a power offset frequency signal; (e) determining, based on the power controller frequency signal, a second voltage control signal; (f) determining, based on the power offset frequency signal, an angle signal indicative for an actual angle of a rotating dq reference frame; and (g) controlling the operation of a power converter based on the first voltage control signal, the second voltage control signal, and the angle signal.

Abstract: A wind turbine tower includes a door access opening in a down tower area of the tower. A hinged door panel covers the door access opening, with a ventilation opening defined through the door panel. A multi-sided intake structure, such as a box-like structure, is connected to an exterior of the door panel over the first ventilation opening. The intake structure extends transversely from the door panel and includes a top side, a bottom side, and at least two vertical sides extending between the top side and the bottom side. The vertical sides are open to air flow therethrough. The top and bottom sides may also be open to air flow therethrough. Air from multiple directions is drawn into an interior of the wind turbine tower through the intake structure and ventilation opening. A filtering system with first and second stage filters may be incorporated with any of the intake structures.

Abstract: In one aspect, a method for assembling a tower section of a lattice tower structure for a wind turbine on a tower assembly fixture may generally include installing a first trolley onto a first fixture arm of the fixture and installing a second trolley onto a second fixture arm of the fixture. In addition, the method may include securing a first support leg of the tower section to the first trolley, securing a second support leg of the tower section to the second trolley and coupling at least one secondary support member between the first and seconds support legs.

Abstract: A joint member for a wind power generation apparatus includes: a first rotor integrally rotating with an output shaft of a speed increaser; a second rotor integrally rotating with an input shaft of a generator; and a one-way clutch provided between the first rotor and the second rotor. A torsion promoting portion being readily twisted and elastically deformed is provided at a portion of the first rotor where power is transmitted from the output shaft to the one-way clutch.

Abstract: The invention relates to a pipeline system for a linearly concentrating solar power plant (1) with at least one receiver line (13), in which a heat transfer medium is heated by radiating solar energy, or with a central receiver and at least one emptying tank (21) and/or one store for the heat transfer medium, the heat transfer medium having a vapor pressure of less than 0.5 bar at the maximum operating temperature. Furthermore, a gas displacement system (31) is comprised, which connects gas spaces in the at least one emptying tank (21) and/or in the store for the heat transfer medium to one another and which has a central gas store (35) and/or a central gas connection (37) and a central exhaust gas outlet (39), through which gas can be discharged into the surroundings.

Abstract: A modular section of water pipe (114) includes: a deformable membrane (130) able to encompass, in an operational state of the section, a tubular space (132) defining an axial direction (AA?) to conduct water, and a series (135) of rings (120, (140) extending along the axial direction (AA?) in the tubular space (132), and including: two end rings (120), each being at a separate end (116, 118) of the section (114) along the axial direction (AA?), the membrane (130) being fastened to the end rings (120), at least one central ring (140), arranged between the two end rings (120), and cables (150, 160) connecting each ring (120, 140) to the closest ring (120, 140) along the axial direction (AA?).

Abstract: A direction controlled service apparatus may include a mounting assembly, a housing assembly configured to operably connect to the mounting assembly, the housing assembly being movable with respect to the mounting assembly, and a plurality of actuators connected between the mounting assembly and the housing assembly, each actuator of the plurality of actuators being configured to contract upon a current being applied to the actuator to rotate the housing assembly with respect to the mounting assembly.

Abstract: A power generation apparatus includes a rocker arm having a first end and a second end and is mounted pivotally between the first end and the second end, wherein reciprocal movement of the first end between raised and lowered positions urges reciprocal movement of the second end between lowered and raised positions. A pulley apparatus couples the second end of the rocker arm to a drive member, wherein reciprocal movement of the second end of the rocker arm between its lowered and raised positions urges reciprocal rotation of the drive member between first and second positions. A transmission interacts between the drive member and the output shaft, wherein reciprocal rotation of the drive member between its first and second positions urges rotation of the output shaft in one direction.

Abstract: A system and method for machinery performing work with hydraulic actuators. Radial hydraulic pumps are aligned end-to-end along a common driveshaft axis to form a multi-pump assembly having a plurality of piston/cylinder units extending in a radial direction. Two or more piston/cylinder units are associated with one another to form multiple piston/cylinder groups. A plurality of control valves combines individual output flows from the two or more associated piston/cylinder units into respective common output flows for each respective piston/cylinder group. A plurality of flow control devices varies the common output flow from each respective piston/cylinder group by throttling inlet flow to the two or more associated piston/cylinder units in each respective piston/cylinder group. Each respective common output flow is directed from each respective piston/cylinder group to a hydraulic actuator on the heavy machinery to control its direction of movement.

Abstract: Precision Analytical Pump of continuous flow, programmable and without pulsation, moves liquids and solutions without dead recharge time, for application in instrumental chemical analysis, in pharmaceutical and Fine Chemistry process lines. It consists of a micro-step electric motor (1), who drives a shaft with linear displacement (2), coupled to two pistons (3), which penetrate two volumetric chambers of variable volume (4), with antechambers (5) arranged between said chambers and motor, involving the movement path of pistons. Said chambers have connections with valves (6) for directional flow control and inner walls fit pistons with sealing rings (7). Said antechambers communicate in order inner saturated air can go from one to the other, for pressure equilibrium during pistons displacement. A digital electronic circuit monitors pump operation, limiting pistons course by sensors (8), and allows interface with the operator and with a computer.

Abstract: In a sealed compressor, electrically-operated element (104) and compressive element (106) driven by electrically-operated element (104) are housed in the inside of sealed container (102). Compressive element (106) includes shaft (126) formed of main shaft (136) and eccentric shaft (134), and cylinder block (128) having; bearing (144) which pivotally supports main shaft (136) of shaft (126); and cylinder (142). Further, the compressive element (106) includes piston (130) which is movable in the cylinder (142) in a reciprocating manner, and connecting portion (132) which connects eccentric shaft (134) and piston (130) to each other. Electrically-operated element (104) is formed of an outer-rotor-type motor which includes stator (150), and rotor (152) which is disposed coaxially with stator (150) so as to surround an outer periphery of stator (150).

Abstract: A cryopump comprises a refrigerator, a condensing array cooled by the refrigerator, a radiation shield surrounding the condensing array and cooled by the refrigerator. The radiation shield has a frontal opening covered by a frontal array that is also cooled by the refrigerator. The frontal array comprises louvers across an otherwise substantially open center region of the frontal opening and an orifice plate across an outer region of the frontal opening. The hybrid frontal array allows for pumping speeds approximating those of a louver frontal array but with flow control comparable to an orifice plate.

Abstract: A piston plug includes a cylindrical body having a longitudinal axis and an outer cylindrical surface. The outer cylindrical surface extends longitudinally between a first surface and a second surface opposite the first surface. The outer cylindrical surface defines a hole extending radially inward. The hole has a central axis perpendicular to the longitudinal axis of the cylindrical body. A first channel and a second channel are defined by cylindrical body. The first channel is in fluidic communication with the first surface and the hole. The second channel is in fluidic communication with the second surface and the hole. The first channel, the second channel, and at least a portion of the hole form a non-collinear flowpath. The piston plug is disposed in a plug hole in a piston and is retained in the plug hole via an interference fit between the piston plug and the plug hole.

Abstract: A sealed compressor includes sealed container that contains electric element, and compression element driven by electric element. Compression element includes shaft that includes main shaft portion, and eccentric shaft portion integrally movable with main shaft portion, and bearing portion that supports main shaft portion of shaft to constitute a cantilever bearing. Compression element further includes cylinder that compresses gas, piston reciprocatively inserted into cylinder, and connecting rod that connects eccentric shaft portion with piston.