Abstract: The present invention relates to a compressor stage for a gas turbine, in particular, an aircraft engine, having a row of rotating blades (3) and a row of guide vanes (4), which is adjacent downstream, wherein the choke point ? and the aspect ratio ARax, which is defined by the quotient between average channel height (h) and average chord length (lax), satisfy the condition ?>?1.33×ARax+5.16.

Abstract: A motor structure of an unmanned aerial vehicle includes a shaft seat, a stator and an external rotor. The stator is mounted around the shaft seat. The stator has a plurality of winding slots. The external rotor includes a shaft, a hollow body and a guiding cover. The shaft is pivotally disposed on the shaft seat. The guiding cover is disposed on one end of the hollow body, and the guiding cover has a central supporting seat, a plurality of blades and a plurality of air flow openings. The blades are connected to the central supporting seat. Each of the air flow openings is located between two adjacent blades. A number of the blades is greater than or equal to a number of the winding slots.

Abstract: A blower, including a scroll casing, a fan impeller, a motor, and a pressure measuring connector. The scroll casing includes a chamber, an air inlet, and an air outlet. The air inlet and the air outlet communicate with the chamber. The motor is disposed on the scroll casing. A drive end of the motor is inserted into the chamber and is connected to the fan impeller. The pressure measuring connector is disposed on the scroll casing. A channel is disposed in the pressure measuring connection, and the channel communicates with the chamber. The channel includes a first subchannel and a second subchannel. The first subchannel communicates with the second subchannel, and an inner diameter of the first subchannel is larger than an inner diameter of the second subchannel.

Abstract: The compressor system comprises a compressor having first compressor stage and a second compressor stage in a back-to-back arrangement. A first gas flow is provided at the suction side of the compressor. A seal arrangement is provided between the first compressor stage and the second compressor stage. A side stream line is in fluid communication with the suction side of the second compressor stage. A side stream valve on the side stream line and a side stream controller are provided, for adjusting the flow of the second gas. An antisurge arrangement comprised of a bypass line and an antisurge valve is arranged at the first compressor stage for preventing surge of the first compressor stage. The side stream controller is configured for reducing the flow of the second gas when an alteration of the pressure ratio across the first compress stag is detected.

Abstract: This disclosure relates to a control system and method for the centrifugal compressor. The system, for example, includes a controller configured command an adjustment of at least one of (1) a flow regulator and (2) a speed of a shaft in order to provide safe, efficient compressor operation. Centrifugal compressors are used to circulate refrigerant in a chiller via a refrigerant loop. Centrifugal compressors operate efficiently before reaching a condition known as surge.

Abstract: A method for identifying a surge limit of a compressor. The compressor is driven at least by an electric motor, the power of which is regulated by means of a regulation device. The regulation device detects regulation activity during the operation of the compressor. A surge limit of the compressor is identified if the regulation activity or a change in the regulation activity overshoots a threshold value which is assigned to the surge limit.

Abstract: According to present embodiments or aspects thereof, a composite booster spool with separable composite blades is provided. The blades are inserted radially from within the inner circumference of the spool and extend outwardly through the spool. The system provides a reduced weight assembly as compared to prior art metallic or composite/metallic combination systems. Additionally, the blades are separable which results in a more field-serviceable assembly over a fully integral system wherein the blades and spool are integrally formed from composites or combination of metal and composites.

Abstract: A compressor includes: an impeller including a hub and a plurality of blades disposed on an outer surface of the hub; and a housing which houses the impeller. The housing includes: a shroud section facing the outer surface of the hub to form a fluid flow path between the shroud section and the outer surface, and surrounding the impeller; and a casing section formed integrally with the shroud section and supporting the shroud section. The shroud section includes a first resin-based material having a static tensile strength of at least 65 MPa and no more than 200 MPa and a breaking strain of no more than 0.3 mm/mm at a temperature of 100° C. The casing section includes a second resin-based material having a static tensile strength of at least 40 MPa and a breaking strain of at least 0.1 mm/mm at a temperature of 100° C.

Abstract: A number of variations may include a product that may be usable with a turbocharger system and may include a housing that may define a lubrication bore. A bearing assembly may be positioned in the housing. A shaft may extend through, and may be supported by, the bearing assembly. A turbine wheel may be connected to the shaft. An end cap may be connected between the housing and the turbine wheel. The end cap may define a cooling chamber. A spray head may provide an opening between the lubrication bore and the cooling chamber.

Abstract: A compressor is described which includes a non-axial first rotor, and a second rotor disposed immediately downstream from the first rotor and being co-axial therewith about a longitudinal axis of rotation. The second rotor rotates in a direction opposite the non-axial first rotor to discharge fluid flow into an uninterrupted passage between an outlet of the second rotor and one of a downstream combustor or a further compression stage. The uninterrupted passage is free of a diffusing passage. A gas turbine engine including such a compressor and a method of compressing fluid flow is also described.

Abstract: A gas turbine engine compressor blade includes an airfoil and a root section connected to a blade platform therebetween and an at least partially curved cropped corner of the blade platform. The corner shape and size may avoid resonance of blade during engine operation. Corner may be J-shaped including a straight section extending from pressure side edge towards suction side edge of platform and curved section extending from straight section to uncropped portion of platform trailing edge of the platform. A method of designing the cropped corner includes choosing shapes sizes of the cropped corner for numerically analyzing and determining shape and size for cropped corner using numerical model to iteratively numerically analyze aerodynamically cropped platform with different shapes and sizes of cropped corner. Numerical model may be validated with engine or component testing of blade having a cropped platform with at least one of the shapes and sizes.

Abstract: A system for ceiling fan blade protection that includes: a rod, where the rod includes a telescoping end; a fan blade cover, where the fan blade cover is capable of fitting over a ceiling fan blade; and a hook assembly, where the hook assembly attaches to the telescoping end and enables the attachment of the fan blade cover to the ceiling fan blade. Preferably, the rod may include a release button, where the release button enables the extension of the telescoping end. Further, the rod may also include a handle.

Abstract: One or more through-holes communicating with one or more of the plurality of screw grooves are formed at the cylindrical stator, a total of circumferential dimensions of the one or more through-holes formed at the cylindrical stator is set at equal to or greater than a circumferential dimension of an outer peripheral surface region of the cylindrical stator facing the second suction port, and a gas path through which inflow gas through the second suction port is guided to a screw groove is provided, the one or more through-holes penetrating through the screw groove and the screw groove being apart from the region facing the second suction port.

Abstract: A turbofan engine includes a fan variable area nozzle includes having a first fan nacelle section and a second fan nacelle section movably mounted relative the first fan nacelle section. The second fan nacelle section axially slides aftward relative to the fixed first fan nacelle section to change the effective area of the fan nozzle exit area.

Abstract: A variable vane assembly for a gas turbine engine compressor and method of manufacturing same is described. A plurality of projections on the inner and/or outer shroud protrude into the annular gas path, each projection being at least partially circumferentially disposed between two variable vanes and located adjacent the overhang portion thereof. The projections have an angled planar surface that is substantially parallel to a plane defined by a terminal edge of the overhang portion of the variable vanes when pivoted through a vane pivot arc.

Abstract: A blower includes an impeller housing, an impeller rotatably secured to the housing and an electric motor. The motor has a motor housing with a central portion and a radially extending portion extending from the central portion, a venturi chamber adjacent the motor housing and opposed to the impeller housing, a stator secured to the central portion of the motor housing, a rotor rotatably secured to the central portion of the housing, and at least one heat generating electrical component secured to the radially extending portion of the motor housing. The impeller housing has a first air pressure therein and the motor housing has a second air pressure therein different that the first air pressure. The venturi housing and the motor housing define a passageway therebetween whereby the difference in air pressure generates air flow within the motor housing to cool the at least one heat generating electrical component.

Abstract: A turbocharger (1) includes a compressor wheel (50) disposed in a compressor housing (12), a turbine wheel (40) disposed in a turbine housing (11), and a shaft (60) that connects the compressor wheel (50) to the turbine wheel (40). The shaft (60) includes a journal portion (63) that adjoins one end and supports journal bearings (7a, 7b), a thrust portion (64) that adjoins the journal portion (63) that supports a thrust bearing (20), a connection portion (66) that adjoins the thrust portion (64) that has surface features (72) formed on an outer surface thereof, and a guide portion (69) that adjoins the connection portion (66). The guide portion (69) and the connection portion (66) are received within a blind bore (58) of the compressor wheel (50) and are configured to connect the shaft (60) to the compressor wheel (50).

Abstract: A silencer duct that may be part of, for example, a turbomachine inlet may include a duct body. A first perforated wall extends within the duct body and substantially parallel to an interior surface of the duct body. A first acoustic absorbing material may be positioned between the duct body and the first perforated wall. A silencer element may extend axially through the duct body, the silencer element including a second perforated wall having a second acoustic absorbing material adjacent thereto.

Abstract: A silencer duct that may be part of, for example, a turbomachine inlet and may include a duct body, and a silencer element extending axially through the duct body. A first portion of a coupler may extend axially from a first side of the duct body. A second portion of a coupler may extend axially from a second side of the duct body. At least one of the first portion of the coupler and the second portion of the coupler are configured to couple to at least one of an adjacent silencer duct and an inlet.

Abstract: A silencer duct includes at least one element including a three-dimensional (3D) chamber having a portion that is at least one of non-vertical or non-linear. An acoustic absorbing member is self-supporting such that is may be positioned within the portion to substantially fill the portion, but does not sag or droop over time.

Abstract: Methods and systems are provided for a compressor of a turbocharger of an engine. In one example, a compressor may include a flow passage and a resonance chamber surrounding the flow passage, with the flow passage fluidly coupled with the resonance chamber by a recirculation passage, a bleed passage, and a plurality of apertures positioned between the recirculation passage and the bleed passage. Flowing fluid from the resonance chamber, through the apertures, and into the flow passage may reduce a noise level of the compressor.

Abstract: A fluid pressure control device for a construction machine includes a first circuit system connected to the first pump; a second circuit system connected to the second pump; a switching valve having a normal position, a straight traveling position and a merging position where the working fluid of the branch section is merged into the second neutral passage; and an open/close mechanism configured to open/close the first neutral passage. In a case where at least one of the control valves, on which merging is required, on the downstream of the second traveling control valve is switched to a position other than the neutral position, by closing the first neutral passage by the open/close mechanism and switching the switching valve to the merging position, the working fluid of the first pump is merged into the working fluid of the second pump.

Abstract: A hydraulic control valve assembly to be integrated into a pressure compensated load sensing system including a fluid source is provided. The hydraulic control valve assembly includes a first working unit to control a first hydraulic function of a machine. The first working unit includes a first directional and return flow control in the form of a first spool, a first function flow control to selectively communicate a working pressure of the first function to the fluid source, and a first downstream flow control. The hydraulic control valve assembly further includes a second working unit arranged downstream of the first working unit. The second working unit to control a second hydraulic function of the machine. The first downstream flow control to selectively restrict a flow a fluid from the fluid source to the second working unit.

Abstract: Particular embodiments of the inventive technology disclosed herein relate to the use of a dynamic valve to reduce motion caused by impulse force applied to a positioned component. Typically, the inventive technology finds application in an internally pressurized positioning system. At times, use of the inventive technology may lead to cost savings by, e.g., allowing for the use of smaller diameter positioner actuators and/or a reduced internal pressure.

Abstract: The double-acting pressure reducing cylinder (1) includes a cylinder shaft (71) which cooperates with a double-acting pressure reducing piston (2) connected to transmission elements (3) housed in a transmission casing (8), while a hollow pillar (13) whose ends are articulated is traversed by a rod tunnel and bears against the casing (8) to support the shaft (71), a tie rod (17) likewise articulated traversing the tunnel to clamp the cylinder shaft (71) to the hollow pillar (13), while lower centering elements of the cylinder (20) and upper centering elements of the cylinder (21) integrated with the transmission casing (8) in particular via a centering frame (22) allow the cylinder shaft (71) to move freely in parallel with its longitudinal axis but not in the plane perpendicular to the axis.

Abstract: A sensor (S) is provided for determining the stroke of the piston rod (6) of a fluid cylinder, particularly a hydraulic or pneumatic cylinder. The sensor includes a lighting unit for illuminating a code applied on the surface of the piston rod and differing from said surface by color, a first camera unit with a first lens system for recording a first image of the illuminated code in a first scanning window, an evaluation unit for evaluating output signals of the first camera unit, and an interface for issuing the evaluated output signals as information regarding the position of the piston rod. Additionally, a second redundant camera unit is provided with a second lens system, which serves for recording a second image of the illuminated code in a second scanning window.

Abstract: A hydraulic pump radiant noise reduction method for a forklift or other work machine is disclosed. The method includes initiating a noise control algorithm that is enabled during periods when the displacement of the hydraulic pump remains in the zero displacement position and an operator is not demanding flow from any of the hydraulic branch circuits. When the noise control algorithm is enabled, the control valve assembly associated with the hydraulic branch circuit having the lowest hydraulic fluid pressure in relation to the hydraulic fluid pressures of all other hydraulic branch circuits is opened while the remaining control valve assemblies are in held or placed in a closed position. In an alternative embodiment, a drain valve assembly is provided that is opened when the noise control algorithm is activated.

Abstract: A flow conditioner for a circular pipe having an axis. The flow conditioner includes a plate having a face to be disposed in the circular pipe with the face of the plate perpendicular to the axis of the pipe. The plate has a central circular passage area through which fluid flows surrounded by two or more concentric arrays of segmented annular passages for fluid flow defined by separating and subdividing ligaments, with at least one subdividing ligament having a width different than a width of a second subdividing ligament. Alternatively, or in addition, there is at least one array of annular passages having a radial width different than a radial width of a second array of annular passages and at least one subdividing ligament having a width different than a width of a second subdividing ligament. A method of producing an optimized geometry of flow conditioner for a circular pipe having an axis.

Abstract: A band that enables preventing an extra length region of a band main body from interfering with a peripheral component or the like. The band includes a head that has a through-hole, and a band main body that extends from the head. A wrapping region that is to be wrapped around an object, an insertion region that is to be inserted into the through-hole, and an extra length region that is to be pulled out from the through-hole are successively arranged in the extending direction of the band main body. The through-hole of the head is provided with an inclined surface that orients the insertion region such that the extra length region extends from the through-hole in a direction of approaching the wrapping region.

Abstract: The invention is a new stabilized racking system for solar cell panels on a surface through a novel use of ballast weights and a wind optimized design. The system is further optimized to fit a range of sizes and thicknesses of modules through a combination of self adjusting end clamps, adjustable tilt legs, and unique wind screen design. The system can include an array of individual solar panel systems that are reinforced in both lateral directions to reduce the amount of ballast weight required.

Abstract: A device which can be fixed to the edge of a panel, for example a sound-absorbing panel formed by heat-bonded synthetic fibres, is disclosed. The device includes a body with a longitudinal through-hole and two walls which define a cavity for enclosing the edge of the panel. The through-hole communicates with the cavity. The through-hole is configured to guide a threaded element (screw or the like) towards the cavity so that the threaded element engages at least with the edge of the panel so that it expands towards the walls of the cavity and is firmly retained by them.

Abstract: A method and apparatus for reworking a composite structure. A fastener is cooled from a first temperature to a second temperature at which a diameter of a post of the fastener is reduced by a desired amount. The post of the fastener is placed into a channel in a bushing such that a desired interference fit occurs when the fastener is at the first temperature. The bushing with the fastener is positioned in a hole in the composite structure. A gap is present between an outer surface of the bushing and an inner surface of the hole. A gap is also present between an end of the bushing and a second structure.

Abstract: A fastener is provided for securing a first panel to a second panel. The fastener includes a stud insertable through apertures in the first and second panels. A handle pivotally connected to a stud head and pivotal between an upright position and a folded. A biasing assembly is connected to the stud head and the handle that biases the handle outward relative to the stud head. A fastener is also provided for securing together the first and second panels, including a grommet, a receptacle and an insert in threaded engagement with an interior of the receptacle. The receptacle may be a rivet nut.

Abstract: A fastener is provided for securing a first panel to a second panel. The fastener includes a stud insertable through apertures in the first and second panels. A handle pivotally connected to a stud head and pivotal between an upright position and a folded. A biasing assembly is connected to the stud head and the handle that biases the handle outward relative to the stud head. A fastener is also provided for securing together the first and second panels, including a grommet, a receptacle and an insert in threaded engagement with an interior of the receptacle. The receptacle may be a rivet nut.

Abstract: A connector, for connecting two profiled-section elements of the channel type having a bottom and an upper side formed by flanges defining between them a longitudinal slot, includes an elongate connector body designed to be inserted partially into each of the profiled-section elements to be connected from the respective longitudinal ends thereof, where the connector body is at least provided with two bores. The connector includes at least two screws, the screws having a shank having a tip on one end and a head on another end, where the shanks of the respective screws extend through the respective bores. The connector body includes a connector plate with upstanding edge portions on either lateral side thereof, the upstanding edge portions having a top edge remote from the connector plate 3, the top edges, in use, facing the flanges of the profiled-section element.

Abstract: A joint assembly includes a clamp member and a spacer plate. The clamp member includes a first jaw surface and a second jaw surface that define a gap therebetween. The spacer plate is connected to the clamp member such that the spacer plate is disposed within the gap between the first jaw surface and the second jaw surface. The spacer plate includes a body and a seal member. The body includes a perimeter. The seal member is connected to the body such that it is disposed adjacent the perimeter of the body. The seal member extends over a segment of the perimeter of the body. The seal member is in sealing engagement with the first jaw surface and the second jaw surface.

Abstract: In one aspect, a method of hanging a fixture from a substantially vertical surface is described herein. In some embodiments, the method comprises providing a spring cleat. The spring cleat comprises a housing, a lever arm, and a hook. The housing has a first surface and a second surface. The lever arm is pivotally connected to the housing and is spring biased toward the first surface of the housing in an extended position. The hook is attached to the lever arm. The lever arm, upon application of a force opposite the first surface upon at least one of the lever arm and the hook, is operable to pivot away from the first surface of the housing towards a depressed position. The method further comprises providing a French cleat operable to engage the hook of the spring cleat.

Abstract: A multi-purpose bit assembly is shown and described herein. The tool assembly may comprise one or more body members. A body member may comprise a magnet, a main body and a bit. The main body may comprise various sides, one or more of which may include one or more apertures on its surface and one or more bits protruding therefrom. The bit may include a bit body and a bit head. The body members may include differently configured bits. Bits may be inserted into the apertures to connect the body members. The bit assembly may comprise one or more attachment members. An attachment member may attach two or more bits together.

Abstract: A method and apparatus for a locking quick-release pin assembly. A cover comprises a body with an opening at a first end, a domed second end, and a plurality of tabs extending from the body. Each tab of the plurality of tabs has a hole. Each hole is concentric with another hole of another tab of the plurality of tabs.

Abstract: Disclosed is a joining structure for joining dissimilar materials, such as a plastic plate and a metal plate. The joining structure is positioned or formed at where a plastic plate and a metal plate are joined. The joining structure includes: a self-piercing rivet piercing through the plastic plate to be pressed onto the metal plate and subjected to plastic deformation. In particular, the plastic plate includes a self-healing capsule containing a self-healing agent in a base material of a plastic resin and a catalyst being polymerized with the self-healing agent. The self-healing capsule is broken by a crack of the base material at a periphery of a pierced portion of the plastic plate, and the self-healing agent flowing out of the self-healing capsule fills a gap of the crack and causes polymerization with the catalyst to cure the crack portion.

Abstract: The invention relates to a two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, the top part being permanently connected to the cutting part in the region of the shank portion by way of impact extrusion.

Abstract: A fastening system for assembling appliances, in particular electrical appliances, comprising at least one profile rail provided with openings and comprising at least one quick-fastener which has a body in which at least one internal thread is formed, is characterized in that the body has over its length (L) at least two spaced-apart internal threads, wherein, in an exact position of the quick-fastener relative to the profile rail, each of the internal threads is brought into alignment with one of the openings of the profile rail, and in that a clamping blade having the same length L as the body is attached to the body, which clamping blade forms between it and the body a gap for receiving the profile side and holds the body against the profile rail by friction.

Abstract: A weld stud including a shank that has a reduced diameter portion, and a larger diameter portion. A weld base is defined on the reduced diameter portion and a flange is positioned on the larger diameter portion. A bore wall extends axially through a face of the flange and into the larger diameter portion. The bore wall has a threaded portion that has a threaded diameter for receiving a fastener. A base diameter of the weld base is smaller than a larger diameter of the larger diameter portion and substantially equal to, or smaller than the threaded diameter. The threaded portion is axially spaced from the face of the flange by a first unthreaded portion, which defines a first unthreaded diameter that is larger than the threaded diameter. These features limit the loads transmitted to the fastener, thus allowing the weld stud to withstand shock loads to prevent fastener failures.

Abstract: A composite tube made from a combination fiber and epoxy is disclosed. The tube may be made by filament winding although other materials and processes are suitable. In one example, the tube laminate is a mix of axial and helical fibers tailored to meet the stiffness and strength requirements of the particular application. Fibers having a different modulus may also be mixed to meet axial and torsional stiffness requirements. For example, high modulus fibers may be used in a helical pattern to handle high torque loads while lower modulus fibers may be used for the remaining portion of the tube laminate. The composite tube may be used for load and/or torque bearing applications and can include a support tube pressed fit into an end of the tube.

Abstract: A rocking journal bearing is provided in a piston coupling mechanism of a two-stroke cycle engine. The bearing includes a sleeve and a wristpin constructed with two sets of eccentrically-disposed bearing surfaces which alternate in accepting a compressive load during an operational cycle of the bearing. The sleeve includes a network of grooves to transport oil to the bearing surfaces. Lubricating oil flow through the bearing is minimized by limiting provision of pressurized oil from the wristpin to the network of grooves to portions of the cycle when one or the other of the sets of bearing surfaces receives the compressive load.

Abstract: The present invention relates to an elastic joint apparatus (a flexure mechanism) that can be used for various purposes, such as an industrial purpose, a medical purpose, a training purpose, etc regarding human bodies, animals, mechanical devices, and products. More particularly, the present invention relates to an elastic joint apparatus (a flexure mechanism) in which a joint connection means inserted and mounted into a joint means enables linear movements in X-axis, Y-axis and Z-axis directions and rotational movements in altitude, azimuth and axial rotation directions by means of the bending and elastic force of an elastic means, and in which the joint connection means is configured to be separated from and coupled to the joint means by the elastic force of the elastic means in proportion to applied force.

Abstract: A tensioner for preloading a bearing, the bearing including a first bearing ring and a second bearing ring and being configured to transmit a preload force in a radial direction and/or in an axial direction between the first bearing ring and the second bearing ring, the tensioner including a component coupled to the first bearing ring, a support element for supporting the component relative to the second bearing ring such that a closed force flow arises from the first bearing ring via the component and the support element to the second bearing ring, and a sleeve disposed in an axially displaceable manner between the first bearing ring and the component, the sleeve being configured to change the preload force in response to an axial displacement of the sleeve with respect to the component.

Abstract: A movement device includes: a track body, and a moving body which includes: a plurality of endless circulation passages; and a roller configured to roll in the plurality of endless circulation passages, the moving body being movable relative to the track body via the roller disposed between the track body and the moving body. The moving body further includes: a moving body main body in which inner peripheral portions of roller direction-change passages configuring the adjacent endless circulation passages are formed to be adjacent to each other on an end surface in a movement direction in which the moving body moves; and a cover body which is attached to the end surface of the moving body main body and in which outer peripheral portions of roller direction-change passages configuring the adjacent endless circulation passages are formed to be adjacent to each other.

Abstract: A bearing assembly may include a first bearing element defining a first bearing surface and a second bearing element defining a second bearing surface. One of the first and second bearing elements may have a fluid channel with an inlet for receiving a bearing fluid and at least one outlet in the bearing surface of the one of the first and second bearing elements. The first bearing element may be configured for rotation at a design rate of rotation relative to the second bearing element with the first bearing surface facing the second bearing surface. The first bearing element may apply a force directed from the first bearing surface toward the second bearing surface during rotation at a reduced rate of rotation less than the design rate of rotation.

Abstract: Provided are a fluid dynamic bearing, a motor, and an optical deflector, for which a fixed shaft can be attached with little axial eccentricity. The bearing (10) is equipped with a fixed shaft (11), a sleeve (20) provided so as to be capable of rotating around the fixed shaft (11), dynamic pressure generating sections (22, 23) provided in the sleeve (20), and a lower case (30) for securing the lower end (11a) of the fixed shaft (11). In addition, the bearing is equipped with a retaining case (40), which has a chuck (52) that retains the upper end (11b) of the fixed shaft (11) secured by the lower case (30), and which can be secured to the lower case (30) in a state that does not generate pressure causing the axial center of the fixed shaft (11) to move.