Abstract: An evaporative fuel treatment apparatus includes a canister, a vapor passage, an outside air introduction passage, a purge passage that connects the canister and an intake passage to each other, a sealing valve configured to open/close a flow channel of the vapor passage, a tank internal pressure sensor, a pressure sensor configured to detect a vapor pressure; and an electronic control unit. The electronic control unit is configured to determine whether or not there is an abnormality in the tank internal pressure sensor based on a change in the vapor pressure in changing over the sealing valve from a closed state to an open state, when an amount of change in the tank pressure in changing over the sealing valve from the closed state to the open state is lower than a first predetermined value.

Abstract: Methods and systems are provided for cleaning a fuel vapor storage canister positioned in an evaporative emissions control system of a vehicle. In one example, a method comprises sealing a fuel system of the vehicle for descending an altitude change that is predicted in advance, and subsequent to the vehicle descending the altitude change, unsealing the fuel system to passively purge fuel vapors stored in the fuel vapor storage canister to a fuel tank of the vehicle. In this way, bleed through emissions from the fuel vapor storage canister may be reduced, and engine operation may be improved.

Abstract: Various embodiments include a method for identifying an inlet and an outlet valve stroke phase difference comprising: measuring pressure oscillations during operation; generating a corresponding signal; determining a corresponding crankshaft phase angle; applying a discrete Fourier transformation to the pressure signal to determine amplitudes of selected frequencies in relation to the crankshaft phase angle; determining lines of equal amplitudes of the frequencies based on the amplitudes depending on the phase differences using reference lines; determining an intersection of the lines by projection into a common plane; and determining the inlet valve stroke phase difference and the outlet valve stroke phase difference from the determined common intersection point of the lines of equal amplitudes of the selected signal frequencies.

Abstract: An engine maintenance set can be generated via a computerized system using engine status data for an internal combustion engine. The generating can include operating on the engine status data using a set of computer-readable maintenance set generation rules, with the rules correlating an engine maintenance set with a triggering condition. The generating can include determining that the triggering condition is met, with the triggering condition including each of one or more triggering parameters being within one or more corresponding triggering value ranges. The triggering parameters can include at least one engine emission triggering parameter. The generating can further include producing the engine maintenance set using the maintenance set generation rules. The generated engine maintenance set can be issued, with the engine maintenance set including one or more commands to perform one or more maintenance operations to improve efficiency of the engine and/or one or more engine status notifications.

Abstract: A combustion control method in an engine of a vehicle, the method includes the following steps. A step of specifying a NOx concentration in an exhaust gas, when an EGR rate is out of a first reference range, and determining whether a value thereof falls within a predetermined second reference range; a step of, estimating a heat generation rate profile indicating crank angle dependency of a heat generation rate in the engine, when the NOx concentration is determined out of the second reference range; and a step of comparing a value of an index characterizing the estimated heat generation rate profile with a value of an index in an ideal heat generation rate profile specified from a driving condition of the vehicle and controlling a combustion condition in the engine based on a result.

Abstract: Systems and methods for injecting fuel to an engine in response to a fuel injection delay are presented. The method includes determining fuel delay in a fuel injected engine with cylinders that may be deactivated. In one example, the fuel injection delay is determined via a cylinder firing schedule array when the cylinder firing schedule array is available. The fuel injection delay is determined via a weighted average of a fuel injection delay of a present engine cycle and a fuel injection delay of a past engine cycle when the cylinder firing schedule array is not available.

Abstract: An injection control device controls a fuel injection valve driven by an electric power. The injection control device includes a current detection unit to detect a driving current supplied to a solenoid of the fuel injection valve, an identification unit to identify a theoretical model of the driving current in a state where a movable core moved by an electromagnetic force generated by the solenoid is at rest, and a state detection unit to detect a state of the movable core. The state detection unit detects the state of the movable core, based on a deviation between the driving current detected by the current detection unit and the theoretical model.

Abstract: A failure diagnosis device for an ignition circuit, comprising: an ignition plug; an ignition coil; a capacitor series connection including a high side capacitor and a low side capacitor; a switching-element series connection including a high side switching element and a low side switching element; an inter-terminal voltage detection unit for detecting an inter-terminal voltage of the capacitor series connection; an intermediate voltage detection unit for detecting an intermediate voltage at the connection point of the high side capacitor and the low side capacitor; and a determination unit for determining a failure location of the ignition circuit based on at least one of the inter-terminal voltage and the intermediate voltage.

Abstract: Methods and systems are provided for operating a high pressure injection pump to provide each of high fixed fuel pressure at a port injection fuel rail and high variable fuel pressure at a direct injection fuel rail. Port injection fuel rail pressure can be raised above a pressure provided with a lift pump via a fuel system configuration that includes various check valves, pressure relief valves, and a spill valve positioned between an inlet of the high pressure injection pump and the port injection fuel rail. High pressure port injection may be advantageously used to provide fuel at high pressure during conditions when fuel delivery via high pressure direct injection is limited.

Abstract: A control device for controlling a fuel injection in an internal combustion engine provided with a fuel injection valve has a driving portion supplying an electric power to a terminal of the fuel injection valve so as to drive the fuel injection valve to be opened; a current detecting portion detecting a drive current flowing through the fuel injection valve when the fuel injection valve is driven to be opened; a voltage detecting portion detecting a terminal voltage of the terminal of the fuel injection valve; a correction portion correcting the electric power supplied by the driving portion so that an actual value of the drive current detected by the current detecting portion agrees with a target value; a valve close detecting portion detecting a valve closing timing of the fuel injection valve based on the terminal voltage detected by the voltage detecting portion in a condition where the electric power supplied by the driving portion is corrected by the correction portion.

Abstract: A method of forming an engine is provided. A liner is cast with an outer surface with a first texture extending circumferentially from a first end to a second end of the liner. A circumferential section of the outer surface of the liner is coated with an insulative, thermoset material with a lower thermal conductivity than the texture. An engine and a cylinder liner for the engine are provided. The liner has first and second ends with an outer surface extending therebetween. An outer surface of the liner has axial sections defining a texture and an insulative thermoset coating to form material interfaces with the block with different thermal conductivities thereacross.

Abstract: Recesses are formed in edge portions of a bearing cap bridge from second fastening portions toward first fastening portions, and when seen in an orthogonal direction to the cylinder block bottom wall, third fastening portions that fasten an engine auxiliary device driven by a crankshaft to the cylinder block bottom wall are arranged in spaces R1 to R4 that are demarcated by first imaginary lines L1, which pass through the second fastening portions and are orthogonal to a crankshaft axial line A, and outlines of the recesses.

Abstract: An actuator operable to drive a thrust reverser in a gas turbine engine, wherein the thrust reverser comprises first and second translatable sleeves. The actuator comprises a first actuating member moveable so as to translate the first sleeve and a second actuating member moveable so as to translate the second sleeve. The actuator further comprises an interlock arrangement operable in a locked mode in which the first actuating member and second actuating member are locked so as to move together and in an unlocked mode in which at least one of the first actuating member and second actuator member is free to move independently of the other. Operation of the actuator to open or close the thrust reverser comprises a first mode wherein the interlock arrangement is in the locked mode and a second mode wherein the interlock arrangement is in the unlocked mode.

Abstract: A system and methods are disclosed for an upper stage space launch vehicle that uses gases from the propellant tanks to power an internal combustion engine that produces mechanical power for driving other components including a generator for generation of electrical current for operating compressors and fluid pumps and for charging batteries. These components and others comprise a thermodynamic system from which system enthalpy may be leveraged by extracting and moving heat to increase the efficient use of propellant and the longevity and performance of the launch vehicle.

Abstract: A carburetor for the combustion engine in a handheld work apparatus has a carburetor housing in which a carburetor drum is mounted rotatably about a pivot axis. The carburetor drum has a drum body which has at least one channel which runs transversely with respect to the pivot axis and forms an intake channel portion. A sensing unit for sensing at least one rotational position of the carburetor drum is provided. The sensing unit includes a control contour and a sensing device interacting with the control contour. The control contour is formed on the carburetor drum. A method for operating a combustion engine makes provision for the control device to control the supplied quantity of fuel depending on the rotational position, sensed by the sensing unit, of the carburetor drum.

Abstract: A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.

Abstract: An exhaust gas recirculation (EGR) cooler includes: a cylinder block having a mounting space and having a cooling water inlet through which cooling water is introduced; at least one core assembly disposed in the mounting space and including an upper core and a lower core, wherein the upper core and the lower core are coupled to each other to have a flow path through which the exhaust gas flows; and a cover plate blocking the mounting space and having a cover inlet through which the exhaust gas flows in; a cover outlet through which the exhaust gas flows out; and a cooling water outlet through which the cooling water is discharged.

Abstract: An exhaust gas recirculation system for an internal combustion engine is provided. The exhaust gas recirculation system includes: an EGR passage configured to connect an exhaust gas passage of the internal combustion engine with an intake air passage; an EGR cooling system arranged at the EGR passage; and a control device configured to control the EGR cooling system. The control device is configured to provide feedback control of the cooling efficiency of the EGR cooling system to cause the temperature of intake gas suctioned into a cylinder of the internal combustion engine to approach a target intake gas temperature. The control device is configured to more increase the amount of change of the cooling efficiency when the flow rate of EGR gas recirculated is less.

Abstract: An intake system of a vehicle, includes an air cleaner case, an air filter that is arranged inside the air cleaner case and positively charged, and a self discharge type static eliminator that decreases an amount of electrification charge on a wall surface of the air cleaner case within a limited range about a location where the self discharge type static eliminator is installed, when the self discharge type static eliminator is installed on the wall surface of the air cleaner case. An peripheral edge part of the air filter is held by an air filter holding part of the air cleaner case. The self discharge type static eliminator is installed on an outer wall surface of the air filter holding part of the air cleaner case.

Abstract: An apparatus and method for a heat shield with an integrated air filter assembly is disclosed. Wherein the air filter assembly comprising a filter material circumferentially extending such that the filter material surrounds at least a portion of an interior cavity of the air filter, a distal end cap affixed to a distal end of the filter material, and a wire support extending along at least a portion of an exterior surface of the filter material; and wherein the heat shield is configured to direct cooler air into an air intake conduit extending from an intake portion of an automobile engine for combustion.

Abstract: A method for operating a solenoid valve coupled to the inlet valve of a fuel injection pump comprises adjusting a pull-in electrical energy of the solenoid valve based on a fuel injection pump volumetric efficiency.

Abstract: The housing includes a first cylinder part having a first end connected to a nozzle, a second cylinder part having a first end connected to a second end of the first cylinder part and forming a magnetic throttle part in at least a part of the second cylinder part in an axial direction, a third cylinder part having a first end connected to a second end of the second cylinder part, and a fuel passage formed inside the first cylinder part, the second cylinder part, and the third cylinder part so as to communicate with injection holes and guide the fuel to the injection holes. A yoke has a cylindrical shape, of which the first end side is connected to the first cylinder part and the second end side is connected to the third cylinder part, and is provided on a radially outer side of the housing such that an axial force is generated in the first cylinder part and the third cylinder part in a direction in which the first cylinder part and the third cylinder part approach each other.

Abstract: Disclosed herein is an injector fixing structure of a fuel rail. The injector fixing structure for a fuel rail module is configured such that an injector cup that includes a slot formed at a side thereof and an injector that includes an anti-rotation pin inserted into the slot are coupled to each other by a clip. The injector fixing structure also includes a lock formed integrally with the anti-rotation pin, and a fixing member coupled to the slot and allowing the lock to be secured when the anti-rotation pin is inserted into the slot such that the anti-rotation pin is prevented from being separated from the slot. The present invention may prevent separation of the injector from the fuel rail during transportation of the fuel rail module, thereby improving assemblability of the fuel rail module in engine assembly and increasing process efficiency.

Abstract: It is prevented that residual fuel left in the vicinity of an injection nozzle outlet is carbonized to cause adherence of the carbonized fuel as deposit and changing of a spray pattern or an injection flow rate. A fuel injection valve includes a seat portion on which a valve body is seated and a seat portion in which an injection hole for injecting fuel downstream from the seat portion is formed, in which a concave surface denting in a direction opposite to a fuel injecting direction is formed on an outer peripheral side away from the injection hole at an end face located downstream of the seat member, and the concave surface is formed such that a material surface in an outer peripheral region has a larger wettability for the fuel than in an inner peripheral region.

Abstract: A fuel injection pump for a diesel engine, including: a control rack arranged in a rack chamber formed between a pump head and a pump housing, and configured to adjust a fuel injection amount; a transmission shaft rotatably supported by a transmission shaft hole formed in the pump housing; and a lubricating oil passage formed in the pump housing, and configured to pressure-feed lubricating oil between the transmission shaft and the transmission shaft hole. The transmission shaft has an oil passage therein through which passage the lubricating oil pressure-fed to the lubricating oil passage partially passes, a first opening of the oil passage is communicated with the lubricating oil passage, and a second opening of the oil passage is formed on the outer circumferential surface of an upper portion of the transmission shaft, nearby the control rack.

Abstract: A starter motor assist mechanism is provided. The starter motor assist mechanism may include a housing, a solenoid, and a hammer. The housing may be attachable to a starter motor. The solenoid may be disposed within the housing, and the hammer may be connected to the solenoid. The solenoid may move the hammer from a retracted position to an extended position for striking the starter motor.

Abstract: Systems and methods for operating a vehicle that includes an engine that may be automatically stopped and started are described. In one example, inhibiting of automatic engine stopping and starting may be withdrawn in response to a change in driver vehicle settings or when a temperature of an engine is less than a threshold temperature.

Abstract: There is provided an internal-combustion-engine starting apparatus that eliminates the restriction that the portion of the output axle at the axial-direction anti-motor side needs to be narrower than the inner diameter of an inner ring portion and that eliminates the requirement that a member for restricting the output axle from traveling toward the axial-direction anti-motor side is added as an extra component. An internal-combustion-engine starting apparatus is characterized in that the outer helical spline includes an outer ridge portion, in that an inner helical spline includes a both-side opened recess groove portion and a one-side opened recess groove portion in that the outer ridge portion engages with the one-side opened recess groove portion, and in that the axial-direction length of the inner small-diameter portion is the same as or larger than the axial-direction length of the outer ridge portion.

Abstract: An ignition coil for an internal combustion engine has a primary coil and a secondary coil, a case, a high voltage connection terminal, and a conduction terminal. The high voltage connection terminal is accommodated in the case in a state being sealed by a filling resin. The high voltage connection terminal is disposed in a state inclined an aligned direction of the secondary coil and the conduction terminal, and is configured to be elastically deformable. The conduction terminal includes an engaging part for engaging a terminal distal end portion of the high voltage connection terminal and a supporting part for supporting a terminal intermediate portion of the high voltage connection terminal which is a portion closer to a connecting portion with the secondary coil than the terminal distal end portion is.

Abstract: An ignition apparatus includes a plasma device, a first circuit, a second circuit, and a control unit. The plasma device produces a plasma discharge in an air-fuel mixture before an arc discharge is produced. The first circuit causes an ignition plug to start the arc discharge. The second circuit energizes a primary coil in a direction opposite to the direction of the energization by the first circuit during the arc discharge, to maintain energization of the secondary coil in the same direction as the direction of the energization started by an operation of the first circuit, to cause continuation of the arc discharge. The control unit controls operations of the first circuit, the second circuit, and the plasma device.

Abstract: A low Reynolds number airfoil for a wind turbine blade, the airfoil having a leading edge 101, a trailing edge spaced from the leading edge 101, a chord 120 defined as a straight line joining the leading edge 101 and the trailing edge, a chord 120 length defined as distance between the trailing edge and the point on the leading edge 101 where the chord 120 intersects the leading edge 101 wherein the airfoil comprises a camber 121 between 5% to 7% of the chord 120 length, the camber 121 is disposed within a distance of 17% of the chord 120 length from the leading edge 101 and a thickness of the airfoil not greater than 7% of the chord 120 length.

Abstract: A wind turbine comprising a support structure for supporting a rotatable, substantially vertical hub wherein at least one substantially horizontal support arm is connected to the hub. At least one wind trap is connected to each of the at least one support arm, and each of the at least one wind trap supports at least one petal that may move between an open position, wherein wind is not blocked by the at least one petal, and a closed position, wherein the at least one petal blocks the wind thereby causing the wind to move the at least one wind trap and rotate the hub.

Abstract: A unique wind turbine blade features a drag element having a concave surface for impingement of airflow thereagainst to create a drag force, and an airfoil having a rounded edge and an opposing sharper edge. The sharp edge points toward the drag element from a side thereof to which the concave surface faces, and the rounded edge points away from the drag element on the same side thereof as the sharp edge such that the sharp edge leads the rounded edge under movement of the drag element by the drag force. A unique wind turbine features an auxiliary support bearing disposed at a spaced axial distance from the rotor, and an auxiliary blade support connection spanning from the auxiliary bearing to the blade at a distance spaced axially from where a rotor blade support connects to said blade.

Abstract: The present invention relates to a modular transportation and storage system for a wind turbine rotor blade comprising a first and a second tip end receptacle (112, 160) for supporting the blade, a tip end frame (111) for receiving any of the first and second tip end receptacles, wherein the first tip end receptacle (112) is adapted for supporting the blade (10) in a substantially vertical position, and wherein the second tip end receptacle (160) is adapted for supporting the blade in a substantially horizontal position.

Abstract: The invention provides a lightning receptor arrangement (11, 12) for a wind turbine blade (10) comprising at least a self-threading screw (21) having a head (23) and a threaded shaft (25) as a the external metallic receptor element for receiving a lightning strike in one side of the wind turbine blade (10) and an internal element comprising an electrically conductive block (20) configured with at least an unthreaded hole (41) for cooperating with said threaded shaft (25) and connected to a down conductor (18) of a grounding arrangement. The internal element is joined to at least a shell (17) of the wind turbine blade (10) with an adhesive force capable of withstanding the torque applied to the self-threading screw (21) for threading it to the unthreaded hole (41).

Abstract: Embodiments describe a method for predicting the accumulation of ice on a rotor blade (111, 112) of a wind turbine (100) and the use thereof.

Abstract: Apparatus for treating a surface of a wind turbine blade (14), comprising an expandable structure (22) that is deployable from a collapsed state into an expanded state in which the structure defines an elongated treatment zone (32) into which a blade (14) is receivable in use. The apparatus includes treating means (52) arranged to apply a treatment in the treatment zone. Also provided is a method for treating a wind turbine blade (14) including: positioning a wind turbine blade in a substantially vertical orientation; locating an expandable structure (22) adjacent the wind turbine blade; deploying the expandable structure (22) about the blade (14) such that the expandable structure (22) defines an elongated treatment zone (32) which receives at least part of the blade (14); and applying surface treatment to the surface of the blade (14) using the expandable structure (22).

Abstract: A field of feeding propellant gas to ion thrusters, and in particular a method of feeding an ion thruster with propellant gas coming from a pressurized tank via a feed circuit including an on/off valve and, in succession downstream from the on/off valve, a high pressure restrictor, a buffer tank, and at least one low pressure restrictor. The method includes the steps of calculating a pressure setpoint for the buffer tank as a function of a flow rate setpoint, calculating the difference between the pressure setpoint for the buffer tank and a pressure measured in the buffer tank, calculating a setpoint for the opening time of the on/off valve as a function of the difference and of a pressure inside the pressurized tank, and opening the on/off valve in compliance with the opening time setpoint.

Abstract: An electric power supply system for a Hall effect electric thruster. The Hall effect electric thruster includes an anode, a cathode, a heater for the cathode and an igniter. The electric power supply system includes a first power supply source to power the anode, a second power supply source to power the heater and a power supply unit to electrically supply the igniter. The power supply unit includes a third power supply source and a passive electric circuit. The third power supply source powers the passive electric circuit and is configured to generate a voltage in the form of at least one pulse.

Abstract: A high pressure axial piston pump displaces high pressure, high volume fluid into a 1994-2003 7.3 liter power stroke or T444E International engine. A pump housing forms a central borehole, an intake port, and two discharge ports angled about 122 degrees from each other and in fluid communication with engine. A drive shaft rotates a cylinder block about an axis of rotation. A cam is tilted at an angle relative to axis of rotation. Multiple pistons, having a cam end and a block end, reciprocate through cylinder block. The cam end is constrained to follow surface of cam. When pistons move proximally to tilted cam, the block end restricts intake of fluid, and cam end enables discharge of fluid. When pistons move distally from tilted cam, the block end enables intake of fluid, and cam end restricts passage through discharge ports. The pump is fabricated from billet aluminum material.

Abstract: An exemplary embodiment of the present disclosure relates to a motor-integrated intake apparatus, and the motor-integrated intake apparatus includes: a flow path which is formed in an annular shape in a circular housing; an inlet unit which is installed at one side of the housing and guides a flow of a fluid into the flow path; a discharge unit which is installed at the other side of the housing and guides a discharge of the fluid which is introduced into the inlet unit and passes through the flow path; a piston unit which is made of a magnetic material and compresses the fluid, which is introduced through the inlet unit, while rotating along the flow path; and a coil unit which is installed on the housing and provides rotational power to the piston unit by forming a magnetic field.

Abstract: A manual pumping means is capable of engaging an oil fill port of a vehicle motor so as to pressurize internal portions of the motor and thus propel the motor oil contained within the motor out of a drain portion and into a receiving vessel. The pump would allow extraction of the oil in an expeditious manner, therefore reducing the time required to perform an oil change upon the vehicle.

Abstract: A synthetic jet pump and a method of pumping fluid using such a synthetic jet pump are disclosed. The synthetic jet pump includes a plurality of first stacks disposed in a series arrangement relative to each other, and a plurality of first valves. A first stack of the plurality of first stacks includes a plurality of first connector pairs coupled to a first support structure and a plurality of first bimorph pairs. The first connector pairs and the first bimorph pairs are disposed in a parallel arrangement relative to each other respectively. A bimorph of one of the first bimorph pairs is coupled to a corresponding first connector pair. The plurality of first valves is disposed at an upstream end of the plurality of first stacks. A valve of the plurality of first valves is movably coupled to a corresponding connector of the plurality of the first connector pairs.

Abstract: The bellows pump device supplies pressurized air to one air chamber of two hermetic air chambers thereby to cause a bellows to perform expansion operation to suck a transport fluid, and supplies pressurized air to the other air chamber thereby to cause the bellows to perform contraction operation to discharge the transport fluid. The bellows pump device includes: an electropneumatic regulator configured to adjust a first air pressure of the pressurized air to be supplied to the one air chamber, and a second air pressure of the pressurized air to be supplied to the other air chamber; and a control unit configured to control the electropneumatic regulator such that, at least at a time point of end of expansion during expansion operation of the bellows, the first air pressure is lower than the second air pressure.

Abstract: A light load abnormality determination method for an electric oil pump (3) that circulates oil to an object to be cooled by the electric oil pump driven by a motor (11), the method comprising: a detection step (41) to detect a current flowing through the motor, a voltage supplied to the motor, and a rotation speed of the motor; a calculation step (42) to calculate a piping resistance equivalent value or a reciprocal value of the piping resistance equivalent value, as a load evaluation value for light load abnormality determination, based on the current, the voltage and the rotation speed detected by the detection step; and a light load abnormality determination step (44) to determine a light load abnormality of the electric oil pump based on the load evaluation value.

Abstract: Embodiments of a forged flange lubricator and systems incorporating the same are described. In an embodiment, the forged flange lubricator may include a main body configured to receive fluid raised by a plunger lift assembly from a well. Additionally, the lubricator may include a port in the main body configured to conduct fluid as it is received by the main body, wherein the main body and the port are a unitary structure devoid of applied junctions.

Abstract: A threaded spindle machine includes a metal middle housing part (12) arranged between housing end caps (24) and forming a fluid chamber (16) for receiving a plurality of threaded spindles rotatably supported in the housing end caps (24); an insert (18) adhered into the middle housing part, which insert forms a wear-resistant running surface for the threaded spindles on the inner wall of the fluid chamber (16) and defines an adhesive gap (20) with the inner surface of the middle housing part (12); and at least one filling channel (26) leading from an outer surface of the middle housing part (12) to the adhesive gap (20), and the filling channel (26) extends from an end of the middle housing part (12) which is adjacent to a housing end cap (24).

Abstract: A scroll compressor is provided which includes: a revolving scroll, a fixed scroll, an autorotation preventing mechanism, a frame, a crank shaft provided with an eccentric pin portion which is eccentric with respect to an axis, the crank shaft being provided with a flange portion at a lower portion of the eccentric pin portion, the flange portion being larger than the diameter of the eccentric pin portion, a balance weight mounted on the flange portion, a sealing member performing sealing between the revolving scroll and the flange portion, and a thrust bearing arranged between the frame and the flange portion. The scroll compressor reduces the amount of oil flowing into a back pressure chamber, thereby improving the performance of the scroll compressor.

Abstract: A compressor may include a shell, first and second compression mechanisms, and first and second motor assemblies. The first compression mechanism may include first and second compression members that are rotatable relative to the shell about first and second rotational axes, respectively. The first motor assembly may be disposed within the shell and may include a first rotor attached to the first compression member. The second compression mechanism may include third and fourth compression members that are rotatable relative to the shell about third and fourth rotational axes, respectively. The second motor assembly may be disposed within the shell and may include a second rotor attached to the third compression member.

Abstract: Disclosed is a compressor. A lubrication surface, which has the same curvature as an inner circumferential surface curvature of a cylinder and which has a predetermined circumference length, is formed on an outer circumferential surface of a roller contacting an inner circumferential surface of the cylinder. With such a configuration, since the outer circumferential surface of the roller contacting the inner circumferential surface of the cylinder come in surface-contact with each other, an oil film is formed between the roller and the cylinder with a wide area. This can reduce a frictional loss.