Abstract: An electronically-releasable suction cup assembly is designed to releasably secure an object to a surface. The suction cup assembly includes a suction cup secured to the object. The suction cup has a cavity and is configured to be releasably secured to the surface. The suction cup assembly further includes a gas generating cell coupled to the suction cup. The gas generating cell is configured to selectively eject fluid into the cavity of the suction cup to release the suction cup from the surface.

Abstract: The ball joint includes a housing that has an inner bore. A ball stud is partially received in the inner bore. The ball stud has a ball portion and a shank portion which are separate pieces from one another and which are in threaded engagement with one another. At least one bearing is disposed in the inner bore and slidably supports the ball portion of the ball stud for allowing the ball stud to rotate and articulate relative to the housing. The ball portion is shaped through a forging operation, and the shank portion is shaped through a process which includes machining and does not include forging.

Abstract: An electric actuator 1 includes: an electric motor 10; a first motion conversion mechanism 20 that has a screw shaft 21 rotatably driven by the electric motor 10 and a nut 22 screwed with the screw shaft 21, and converts a rotary motion of the screw shaft 21 into a linear motion of the nut 22; and a housing 40 accommodating the electric motor 10 and the motion conversion mechanism 20. The housing 40 includes a pair of housing split bodies 41 and 42 split by a plane parallel to an axial direction of the screw shaft 21.

Abstract: A linear guide apparatus may include a guide rail, a carriage block, at least two recirculating tubes, and two end covers. The carriage block has an axial sliding channel formed at a middle portion of a bottom surface thereof, and the carriage block is slidably coupled on the guide rail through the sliding channel. Each of two sides of the sliding channel has at least a sliding groove formed between the carriage block and guide rail. Each sliding groove comprises a plurality of rolling balls installed therein so as to enable the carriage block to slide forward and backward on the guide rail. Each of the sliding grooves is cooperated with a recirculating channel axially penetrating through the carriage block. Each of the recirculating tubes comprises a plurality of spiral threads to enable the rolling balls to have lateral roll at a specific angle when passing therethrough.

Abstract: The present invention achieves a high mechanical load capacity of a rod end by means of a component loop that passes around a bearing, where the component may be made of continuous-fiber reinforced composite material with thermoplastic matrix and where the continuous-fiber reinforced composite material with thermoplastic matrix may extend into a threaded stem of the rod end, and the component made of continuous-fiber reinforced composite material with thermoplastic matrix may be enclosed by short-fiber reinforced, long-fiber reinforced, or unreinforced thermoplastic. The threaded stem can be implemented with an external or an internal thread.

Abstract: Disclosed herein is a sliding member having an alloy overlay layer that comes into sliding contact with a counterpart member thereof and has improved fatigue resistance. The sliding member comprises a base material layer and an alloy overlay layer formed on the base material layer, in which the alloy overlay layer has a soft metal phase made of tin and precipitated in a metallic matrix phase made of aluminum, and when an average aspect ratio of the soft metal phase is defined as A, and its standard deviation is defined as A?, A+A? is 3.0 or less. In this case, the soft metal phase has a shape close to a sphere without elongating in a certain direction.

Abstract: A rolling element for a roller bearing. The rolling element may include a metal substrate having a surface layer. A portion of the surface layer may include a hardened nitrided layer. A diamond-like carbon (DLC) coating may be bonded directly on at least a portion of the hardened nitrided layer.

Abstract: A rolling bearing, a rolling device, and a method of manufacturing the rolling device are provided, by which a long life can readily be implemented by suppressing surface damage even on the use condition that the oil film formation performance of a rolling part is poor. A rolling device includes: a first rolling component made of SUJ2; and a second rolling component made of SUJ2 and configured to contact the first rolling component. A surface of a rolling part of the first rolling component is greater in arithmetic mean roughness than a surface of a rolling part of the second rolling component. The arithmetic mean roughness of the surface of the rolling part of the second rolling component is 0.07 ?m or more and 0.20 ?m or less.

Abstract: A dry-lubricating apparatus, for press fitting onto a mating part, includes (a) a frame, (b) a rubber gasket fixed to the frame to create an interference with a mating surface of the mating part so as to enable the press fitting, and (c) a lead-in edge fixed to at least one of the frame and the rubber gasket. The lead-in edge includes a dry lubricant such that, when the dry-lubricating apparatus is slid onto the mating part, along the mating surface and with the rubber gasket trailing the lead-in edge, a portion of the dry lubricant is abraded off the lead-in edge to reduce friction between the rubber gasket and the mating surface.

Abstract: The invention relates to a device comprising a first component (11) and a second component (12). The first component (11) comprises a cylindrical outer surface (13), and the second component (12) comprises a cylindrical inner surface (17) which is arranged on the outer surface (13) coaxially with a longitudinal central axis (m). First connection surfaces of the first component interact with second connection surfaces of the second component in order to prevent a relative rotational movement of the components (11, 12). The invention is characterized in that one of the connection surfaces forms a retaining toothing (22), and the other connection surface forms mutually spaced longitudinal protrusions (18) which are distributed over the circumference and the tooth flanks of which extend parallel to the longitudinal central axis (m).

Abstract: A screw engagement system comprising a screw and a driver. The screw may comprise a recess in the screw head and a plurality of grooves arranged circumferentially around and formed radially outwardly into the screw head from an inner circumferential surface of the screw head recess. The driver may comprise a driver head having the general shape of a spherical frustum and including a plurality of splines that engage the screw head recess grooves and transmit torque and impart rotational motion to the screw therethrough.

Abstract: A constant velocity joint boot assembly includes a flexible boot having a flexible portion extending between a first end and a second end along an axis. The first end is disposed about a portion of a constant velocity joint and the second end is disposed about a portion of a shaft assembly. The first end defines a skirt having an engineered portion that elastically absorbs and/or reflects impact energy.

Abstract: A clutch arrangement for between an engine and a propeller of a drivetrain of a roadable aircraft. The arrangement includes an engine shaft, a propeller shaft, a stationary clutch arrangement housing, and an engagement member which is rotationally locked to and axially slidable relative to propeller shaft. The engagement member includes a first engagement structure for engaging a corresponding engagement structure associated with the engine shaft for setting the clutch arrangement in a propeller propulsion mode, in which rotational propulsion torque is transmitted from the engine shaft to the propeller shaft via the engagement member. The engagement member further includes a second engagement structure for engaging a corresponding engagement structure associated with the clutch arrangement housing for setting the clutch arrangement in a propeller locked mode, in which the propeller shaft is rotationally locked to the clutch arrangement housing by means of the engagement member.

Abstract: A friction plate includes a core plate defining a bore. The core plate includes an interior core surface defining the bore, an exterior core surface radially spaced from the interior core surface, a first clutch face extending between the interior core surface and the exterior core surface and facing a first direction, and a second clutch face extending between the interior core surface and the exterior core surface and facing a second direction opposite the first direction. The friction plate also includes a friction material disposed on at least one of the first and second clutch faces. A first thickness is defined between the first and second clutch faces on a spline portion. A second thickness is defined between the first and second clutch faces on a friction portion. The first thickness is greater than the second thickness.

Abstract: A clutch assembly comprises a first clutch member configured to selectively couple a first torque input and a second torque input for torque transmission therebetween. The clutch assembly includes a second clutch member configured to selectively couple the second torque input and a third torque input for torque transmission therebetween. In one embodiment, the first clutch member is nested radially inside the first torque input, the second torque input is nested radially inside the first clutch member, the second clutch member is nested radially within the second torque input, and the third torque input is nested radially within the second clutch member.

Abstract: An end disk of a multi-disk clutch is described, which has a ring plate, the ring plate having a central opening and at least one axial impression on a front side via which a corresponding projection is formed on the opposite front side.

Abstract: A hydro-viscous speed regulating device for heavy-load start of a belt conveyor is provided. An input shaft and an output shaft are connected through a spline tube, an inner friction plate set, and an outer friction plate set. The inner and outer friction plate sets are controlled by an inner oil cylinder and an outer oil cylinder respectively. Oil inlet and oil return of the inner oil cylinder and the outer oil cylinder are controlled by an oil inlet valve core and an oil return valve core automatically. During starting process, pressure oil enters into the outer oil cylinder, and pushes the outer friction plate set to be engaged to provide torque required by the output shaft.

Abstract: An object of the present invention is to provide a one-way clutch capable of preventing wear on radially inner engagement surfaces and radially outer engagement surfaces of cams in periods of high-speed freewheeling. The one-way clutch includes an inner race (110) and an outer race (150), a plurality of cams (140) provided between the inner race (110) and the outer race (150), and side plates (120, 130) provided to at least one of the inner race (110) and outer race (150) and positioned on both sides in an axial direction of the cams (140). The plurality of cams (140) are each configured to receive a predetermined centrifugal force to turn in an engaging direction in which the cams engage the inner race (110) and outer race (150) when the inner race (110) and outer race (150) rotate together in the same direction.

Abstract: A braking system (4) for an aircraft wheel (2) comprises first and second brake rotor discs (20a, 20b) axially spaced along an axis (A) and rotationally coupled to the wheel (2), a stator disc (24) arranged axially between the first and second rotor discs (20a, 20b), and a heat shield (34) mounted to at least one of the first and second rotor discs (20a, 20b). Radially outer portions (30) of the first and second rotor discs (20a, 20b) extend radially outwardly of the stator disc (24) to define a gap (32) between the radially outer portions (30) of the first and second rotor discs (20a, 20b). The heat shield (34) extends at least partially over or into the gap (32).

Abstract: Disclosed is a spring for a suspension device for a vehicle. The spring includes: a spring section made of a coil-shaped wire; and a seat section made of an elastically deformable material, brought into contact with a seat turn section of the spring section, and bearing load acting on the spring section. When a direction orthogonal to a direction of the load acting on the spring section is set as a widthwise direction, at least a part of the seat section is provided with a movable region support section having a widthwise dimension less than or equal to predetermined times a diameter dimension of the wire.

Abstract: A spring apparatus (10), including: a spring (12); an elongated object (18A) disposed within and along the spring (12); and a mode-changing assembly (16), for providing a first mode in which a portion (38) of the spring (12) being along the elongated object (18A) is not springy, and a second mode in which an entire of the spring (12) is springy.

Abstract: A hydraulic shock-absorber comprises an outer cylindrical tube, an inner cylindrical tube defining with the outer cylindrical tube an annular chamber, a main piston slidably mounted in the inner cylindrical tube and dividing the inner volume of the inner cylindrical tube into an extension chamber and a compression chamber, both containing an incompressible damping fluid, a valve assembly mounted on a bottom wall of the inner cylindrical tube and comprising a first compression valve and a first intake valve, a cup-shaped body mounted in the inner cylindrical tube, inside the compression chamber, and an auxiliary piston rigidly connected to the main piston and configured to slide in the cup-shaped body at least during a final section of the compression phase of the shock-absorber.

Abstract: A valve seat member is provided with: a first seat arranged so as to be spaced apart from an opening of a port; a second seat connected to the first seat at both ends so as to surround the opening of the port; an island portion arranged on the first seat side of the opening of the port in a region surrounded by the first seat and the second seat such that a hollow space is formed between the island portion and the first seat; and a passage configured to extend through the island portion to allow communication between the port and the hollow space.

Abstract: Described herein is motion damper comprising an elastically deformable sealed exterior housing, a perforated interior housing wholly contained within said exterior housing having at least one perforation, a visco-adaptive fluid contained with said exterior housing and an activating system adapted to selectively modify the viscosity of said visco-adaptive fluid and thus modify the elastic properties of the motion damper.

Abstract: The invention is a liquid filled type vibration isolating device (10) which includes a partition member (16) that partitions a liquid chamber (19) within a first attachment member (11) filled with a liquid into a first liquid chamber (14) and a second liquid chamber (15), and in which a restricted passage (24), which is configured to allow the first liquid chamber and the second liquid chamber to communicate with each other, is formed in the partition member. The restricted passage includes a first communication part (26) opening to the first liquid chamber, a second communication part opening to the second liquid chamber, and a main flow passage (25) that allows the first communication part and the second communication part to communicate with each other. At least one of the first communication part and the second communication part includes a plurality of pores (26a) that penetrate a first barrier (38) facing the first liquid chamber or the second liquid chamber.

Abstract: An eddy current damper includes a screw shaft movable in an axial direction, a plurality of first permanent magnets, a plurality of second permanent magnets, a cylindrical magnet holding member, a cylindrical conductive member having conductivity, a ball nut which meshes with the screw shaft, and a heat transfer layer which covers a surface of the conductive member opposed to the first permanent magnets and the second permanent magnets. The magnet holding member holds the first permanent magnet and the second permanent magnet. The conductive member is opposed to the first permanent magnets and the second permanent magnets with a gap therebetween. The ball nut is disposed inside the magnet holding member and the conductive member, and is fixed to the magnet holding member or the conductive member. The heat transfer layer has a thermal conductivity higher than that of the conductive member.

Abstract: The present invention relates to an inertial transmission device comprising a center element having an axial direction and two ends, one of the ends is a driving end and the other end is an output end, the center element is capable of rotating with the axial direction as a center; and an inertial element having a connecting portion and an inertial portion located at an outer edge of the connecting portion, an inner edge of the connecting portion is connected to the center element, and the inertial portion is closer to the output end of the center element than other portions of the inertial element. Thereby, rotational inertia of the inertial transmission device is close to the output end of the center element.

Abstract: An automatic control unit for field vulcanizing press is provided. The control unit helps to monitor and control all three essential vulcanizing parameters viz. temperature, pressure and time, either locally or through remote access. Data logging, local monitoring & control of vulcanizing parameters or remote monitoring and control of vulcanizing parameters using a smart device are the major features of this control unit in which remote monitoring and control of vulcanizing parameters is the unique feature of this control unit. A video recording unit is also provided to record entire splicing operation and also there is option for online video streaming facility and it will help to monitor the entire splicing operation from a remote-control station.

Abstract: A chain containing links in which at least some of the inner links have links multi-radiused backs which include a small center radius with adjacent larger radiused backs on either side of the center radius. The center radius is present along the back of the link opposite the crotch of the link.

Abstract: A system for transforming rotating motion into linear motion may include an output gear and an output link coupled to the output gear. A shared link may be coupled to the output link and coupled to a rod. An arm may be coupled to the shared link and to a rotating drive. An idle gear may be coupled to the output gear and to a stationary gear. Once rotation has started with the rotating drive, the output gear and idle gear may rotate around the stationary gear while the output link pivots and translates through space with the output gear. The shared link may drive the rod in a linear direction while receiving stabilizing supporting forces from the output link. The intermediate link may be coupled to the output link with a pin. The pin may also couple the intermediate link to the arm.

Abstract: A transmission for a work vehicle with an engine and a drivetrain. The transmission includes a plurality of shafts, a plurality of gears arranged on the plurality of shafts, and a plurality of clutches arranged on the plurality of shafts. The plurality of clutches includes a first clutch, a second clutch, and a third clutch. The transmission provides for full-power shifting throughout at least 24 speeds with only a single clutch swap required for each shift.

Abstract: A powershift transmission includes an input shaft, an output shaft arranged parallel with the input shaft, a branching unit arranged on the input shaft through which a torque acting on the input shaft is divided between two power paths, a switch group including at least two switching stages arranged in the first power path, and a torque converter arranged in the second power path. A torque is transmitted from the input shaft to the output shaft via the switch group and the torque converter.

Abstract: A camshaft chain tensioner, comprising: a piston having an exterior circumferential surface that includes at least one groove; an expandable clip, positioned around the exterior circumferential surface, that includes a first end and a second end, the expandable clip being expandable from a resting diameter to an expanded diameter, wherein the expandable clip existing in the resting diameter engages one of the grooves and prevents axial movement of the piston and wherein the expandable clip existing in the expanded diameter permits axial movement of the piston in response to an axial force exerted on the piston; and a clip retention device that releasably engages the expandable clip and inhibits radially outward expansion of the expandable clip to the expanded diameter of the expandable clip.

Abstract: A tensioner comprising a base, a shaft extending from the base, a pivot arm pivotally engaged with the shaft, a torsion spring disposed between the pivot arm the base, a base portion cooperatively engagable with a pivot arm portion upon an axial movement of the pivot arm to a first position, a removable member engaged with the shaft to retain the pivot arm in the first position, the first position limiting the pivot arm to a first range of movement, and the pivot arm axially moveable to a second position upon removal of the removable member, the second position limiting the pivot arm to a second range of movement.

Abstract: A belt installation device for installing a belt onto a paper machine, pulp machine or board machine, has a first area (4) with an attaching point (5) for attaching the belt installation device to a pulling member, a second area (6) with at least one aperture (7, 7a, 7b, 7c, 7d) for fastening the belt installation device (1) removably to a belt, and a central area (8) between the first area (4) and the second area (6), wherein a pull strength of the attaching point is at least 300 kgf and equal or less than 900 kgf. The belt installation device is bendable between a straight form and a curved form having a radius of curvature of 800 mm. This invention further relates to an installation arrangement and installing method for installing a belt onto a paper, pulp or board machine.

Abstract: An integrated launch clutch and drive sheave for a continuously variable transmission (CVT) is provided. The integrated launch clutch and drive sheave includes a drive sheave, a launch clutch and an integrated hydraulic system. The drive sheave includes a fixed sheave member that is statically mounted on and rotationally fixed to a drive sheave post and a movable sheave member that is slidably mounted on the drive sheave post. The launch clutch is in rotational communication with a motor. The launch clutch is configured to selectively couple engine torque from the motor to the drive sheave post of the drive sheave. The integrated hydraulic system is configured to both activate the launch clutch to selectively couple engine torque between the motor and the drive sheave and to axially move the movable sheave member on the drive sheave post of the drive sheave in relation to the fixed sheave member.

Abstract: A driven sheave and variable torque limiting clutch assembly for a CVT that includes a drive sheave, a driven sheave, a VTL clutch and a hydraulic system is provided. The driven sheave is operationally coupled to a drive sheave via belt of the CVT. The driven sheave includes a fixed sheave member and a movable sheave member. The driven sheave is operationally coupled to a drivetrain. The VTL clutch is coupled between the driven sheave and the drivetrain to selectively couple torque between the driven sheave and the drivetrain. The hydraulic system is configured to manipulate both the movable sheave member of the driven sheave and the VTL clutch with shared hydraulic pressure.

Abstract: A multi-stage planetary roller power transmission device includes a high-speed power transmission mechanism including a first sun shaft, a first fixed ring, first planetary rollers disposed between the first sun shaft and the first fixed ring with a first negative clearance, first support shafts, and an annular first carrier into which the first support shafts are press-fitted; and a low-speed power transmission mechanism including a second sun shaft, a second fixed ring, second planetary rollers disposed between the second sun shaft and the second fixed ring with a second negative clearance, second support shafts, and an annular second carrier into which the second support shafts are press-fitted. A clearance amount of the first negative clearance and a clearance amount of the second negative clearance are equal to each other, and the number of the first planetary rollers is smaller than the number of the second planetary rollers.

Abstract: A continuously variable transmission (1) having the cams (9, 10, 11, 12) that are not circular as usual, but have the form of a spiral. The outer contours (15, 16, 7, 18) of the two cams (9, 10, 11, 12) are each situated in a plane which is perpendicular to the direction of rotation of the respective cams (9, 10, 11, 12).

Abstract: A transmission housing includes a one-piece main housing including a generally annular wall structure cast from aluminum and including a plurality of axially extending raised ribs extending from a first axial end of the wall structure to a second axial end of the wall structure, a plurality of angularly extending raised ribs extending between at least some of the adjacent ones of the plurality of axially extending raised ribs. According to another aspect, the generally annular wall structure includes a plurality of wave structures extending axially along the wall structure.

Abstract: A limited oil displacement system is positioned within a tandem housing of a tandem of a work vehicle. The tandem includes a tandem oil where a chain assembly is at least partially submerged. The limited oil displacement system may include one or more oil displacement unit used for displacing the tandem oil. The oil displacement unit has an upper portion and a lower portion coupled to and positioned under the upper portion. A volume of the upper portion is larger than a volume of the lower portion such that when the tandem of the work vehicle pivots about a lateral axis, the oil displacement unit displaces the tandem oil more than when the tandem of the work vehicle remains horizontally.

Abstract: A vehicle transmission includes a shift lever including a receiving unit formed therein, a bullet in which at least a portion thereof is inserted and disposed within the receiving unit of the shift lever, and a detent groove unit which allows the bullet to advance or retreat depending on a profile of a contact surface in contact with the bullet as the shift lever rotates. The bullet includes a guide aperture formed longitudinally along an advancement-retreat direction of the bullet, and a fixing pin having at least one end thereof fixed to the receiving unit is inserted into the guide aperture.

Abstract: A power transmission device includes a variator, a first oil passage, an electric oil pump provided in the first oil passage, a second oil passage, a switching valve provided at a branch point of the first oil passage and the second oil passage, and a third oil passage. The switching valve switches between two positions, i.e. a first position that causes at least the first oil passage to be in a communicating state, and a second position that causes the second oil passage and the first oil passage on a SEC pulley oil chamber side to be in a state of communicating with each other and causes the third oil passage and the first oil passage on a PRI pulley oil chamber side to be in a state of communicating with each other.

Abstract: A shift range control apparatus acquires a motor rotation angle signal corresponding to a rotation position of a motor, calculates a motor angle based on a motor rotation angle signal, acquires an output shaft signal corresponding to the rotation position of an output shaft, sets a target rotation angle based on a target shift range and the output shaft signal, drives the motor to cause the motor angle to reach the target rotation angle, determines the shift range based on the output shaft signal, monitors a fault in the output shaft signal, and learns a P-side reference position corresponding to the motor angle in a situation where the engagement member abuts against a first wall portion of the shift range switching mechanism, in a condition that the fault occurs in the output shaft signal.

Abstract: A control device for an automatic transmission arranged between an engine and a drive wheel, the automatic transmission including a torque converter having a lock-up clutch, and a transmission mechanism. The control device includes a shift control unit configured to perform shift control of the transmission mechanism. The shift control unit includes a forced downshift control processing unit configured to implement forced downshift when an accelerator foot release operation is performed during auto-upshift in a power-on state with the lock-up clutch engaged. The forced downshift control processing unit is configured to start the forced downshift before an engine rotation speed that has decreased due to the auto-upshift reaches a lock-up release rotation speed.

Abstract: A gearbox for a motor vehicle, includes multiple gears, a housing, an interior space enclosed by the housing, a gearshift clutch located in the interior space, through which a gear can be shifted, and a shifting device for transmitting an external actuating force acting outside the housing for shifting to the gearshift clutch, the shifting device having an inner shifting part in the interior space, a first introduction element which engages through a first opening provided in the housing for guiding the external actuating force to shift the gear to the inner shifting part, a shifting mass arranged outside the housing which is moved during gear shifting, and a connecting element different from the first introduction element with which the shifting mass is connected to the inner shifting part, the connecting element engaging through a second opening different from the first opening in the housing into the interior space.

Abstract: A shift range control apparatus controls a shift range switching system that switches shift ranges by controlling driving of a motor. This control apparatus calculates a motor angle based on a motor rotation angle signal, acquires an output shaft signal based on a rotation position of an output shaft from an output shaft sensor, sets a target rotation angle based on a target shift range and the output shaft signal, and controls driving of the motor such that the motor angle becomes the target rotation angle. The control apparatus sets the target rotation angle to a target limit value, in response to the target rotation angle that is set based on the output shaft signal being a value at which rotation occurs that is further toward a back side in a rotation direction than the target limit value that is set based on shift ranges before and after switching.

Abstract: The dust proof sleeve comprises a rubber tubular bellows part (1) with an opening at both ends for sliding onto an element fitted with the dust proof sleeve. The bellows part (1) comprises an accordion-shaped undulated wall with circumferential peaks (2) and circumferential valleys (3). The dust proof sleeve further comprises at least one reinforcement (4), which is arranged at least along a part of the circumference of the bellows part (1) and adjoins the circumferential shape of the bellows part (1). The at least one reinforcement (4) is at least partly integrated in the bellows part (1) by vulcanization. The invention further comprises a dust proof sleeve production mould and a dust proof sleeve production method.

Abstract: A stuffing box assembly for a fluid end of a hydraulic fluid pump includes a stuffing box unit having a plunger bore configured to receive a plunger of the hydraulic fluid pump and a plurality of seals. The plunger bore extends from a first axial end of the stuffing box unit to a second axial end of the stuffing box unit. The plunger bore includes a first portion configured to receive the plurality of seals and a second portion extending between the first portion and the second axial end. The stuffing box assembly further includes a sensor coupled to the stuffing box unit and configured to determine a fluid pressure within the second portion of the stuffing box unit.

Abstract: A seal device for sealing a space between a housing and a rotating shaft includes seal members, and a holder having a cylindrical portion and configured to retain the seal members the cylindrical portion being press-fitted into a shaft hole provided in the housing. The holder is provided with, at one end of the cylindrical portion, a protruding portion protruded in a radially outward direction of the cylindrical portion. The shaft hole of the housing has a tapered portion having an annular shape and forming one end portion of the shaft hole to guide an insertion of the holder into the shaft hole. The protruding portion is provided on an inner diameter side of the tapered portion.