Abstract: A suction apparatus according to the present invention includes a suction plate, a fixing shaft, a supporting plate, an adhesive member, and a housing. The suction plate is configured to adhere to a suction subject surface. The fixing shaft is configured to be fixed to a central portion of the suction plate, and is configured to upwardly transport the central portion of the suction plate to be separated from the suction subject surface to form a sealed space between the suction plate and the suction subject surface in a pressure lower than an atmosphere pressure. The supporting plate has a ring shape and prepared on a periphery of the suction plate, and is combined with the suction plate. The adhesive member has a ring shape, and includes an upper surface fixed to a lower surface of the supporting plate and a lower surface configured to adhere to the suction subject surface, to prevent inflow of an air toward the sealed space.

Abstract: The present disclosure relates to a reinforced pivot pin receptacle, specifically made of plastic or other non-metal material and a method for adhering planar element to a cardboard surface, specifically wherein the planar element is made of plastic.

Abstract: A pivoting drive socket has a cylindrical body within a sleeve, studs on the sleeve, the studs fitting into a slotted bracket, and the bracket joining to a handle. The slot has an elongated, rectangular shape. The body rotates within the sleeve and has a tab upon one end that receives an external tool. The tab has a shape with at least two flat portions. The bracket permits the handle to engage the tab. The bracket has an opening reinforced by a ring that admits the tab for connection into that handle. The tab has at least two chamfers that grip the bracket during usage. The tab rotates the body which engages a pipe that fits upon a mechanism to raise and to lower trailer legs. The invention allows a trucker to use manual effort or to use power to raise or to lower trailer legs.

Abstract: Provided is a sintered bearing, which is obtained by sintering a green compact including: a partially diffusion-alloyed powder (11) in which a copper powder (13) adheres onto a surface of an iron powder (12) through partial diffusion; elemental copper powder; low-melting point metal powder having a lower melting point than copper; and graphite powder. The partially diffusion-alloyed powder (11) has a maximum particle diameter of 106 ?m or less, and the copper powder (13) of the partially diffusion-alloyed powder (11) has a maximum particle diameter of 10 ?m or less.

Abstract: A slide surface of a thrust bearing includes a planar portion, a taper portion, and a pocket portion. The pocket portion includes a bottom surface, a first side surface, and a second side surface. The first side surface is formed on the side of the taper portion. The second side surface is formed on a side opposed to the first side surface. A depth from the plane of the planar portion to the thinnest portion of the taper portion is between 10 ?m and 80 ?m. A first angle that is an angle between a virtual surface obtained by extending the bottom surface and the second side surface is between 90° and 120°. And a second angle that is an angle between a virtual surface obtained by extending the first side surface and the tapered surface is between 60° and 120°.

Abstract: A thrust washer for an internal combustion engine may include a body. The body may have a slip surface and a planar contact surface associated with an engine block. The slip surface may have a surface profile the may include at least one ramp section, at least one flat horizontal section, and at least one oil channel. The at least one ramp section and the at least one flat horizontal section may be connected via an asymptotic curve. The at least one ramp section may extend asymptotically toward the at least one flat horizontal section. The at least one ramp section may have an angular length of 45° or less, the at least one flat horizontal section may have an angular length of 45° or less, and the at least one oil channel may have an angular length of 20° or less.

Abstract: A bearing assembly includes a first locating bearing and a second locating bearing configured to be mounted on a shaft. The first locating bearing includes a two-part outer ring formed from a radially inward outer ring and a radially outward outer ring, and a diameter of the inward outer ring is smaller than a diameter of the outward outer ring.

Abstract: Two hybrid ball bearings and a compressor bearing arrangement with two hybrid ball bearings for a rotatable support of a rotor of the compressor versus a stator of the compressor. The two hybrid ball bearings are arranged face-to-face or back-to-back, are designed with an optimal axial clearance depending on the inner diameter of a ring-shaped inner raceway element one of the hybrid ball bearings respectively a pitch diameter of one of the two hybrid ball bearings for a long bearing life in connection with an optimal compressor operating performance.

Abstract: A radial magnetic bearing assembly having an unsymmetrical stator. The assembly comprises fewer or smaller electromagnets, and thus capacity, in the two lower quadrants below the rotor in use, in comparison to the electromagnets, and thus capacity, in the two upper quadrants above the rotor in use. This creates space in the two lower quadrants that can advantageously be used to move for example instrumentation and cooling from other places of the assembly to make the bearing assembly compacter, and also to be able to put instrumentation and cooling where it is best needed, close to the rotor.

Abstract: Provided is a bearing structure, including: a thrust bearing surface having a through hole for allowing a shaft to be inserted therethrough; a plurality of land portions, which are formed on the thrust bearing surface, and are separated apart from each other in a rotation direction of the shaft; a tapered portion, which is formed between the plurality of land portions on the thrust bearing surface, and has a projection height in an insertion direction of the shaft which becomes higher toward a forward side in the rotation direction; and a thrust groove, which is formed in the tapered portion, and extends from the through hole to a radially inner side of an outer peripheral end of the tapered portion.

Abstract: Provided is a sliding member and a bearing using the sliding member. The sliding member contains a metallic substrate, a porous layer formed on a surface of the metallic substrate, and a sliding layer covered on the porous layer. The sliding layer is made of a lead-free resin composition. The lead-free resin composition includes a pitch-based carbon fiber, a fluorocarbon resin, and any of or a combination of two or more of aramid fiber, iron oxide, molybdenum disulfide, graphite, and zinc, zinc alloy, or zinc compound. 0.5 weight % or more and 17 weight % or less of a pitch-based carbon fiber is included. A total addition amount of additives excluding the fluorocarbon resin is 25 volume % or less.

Abstract: A Hybrid ball bearing including an outer raceway, an inner raceway, and a plurality of balls arranged between the inner raceway and the outer raceway. The outer raceway and the inner raceway are made from bearing steel and have a first surface RMS roughness Rq1. At least one ball of the plurality of balls is made from a ceramic material and has a second surface RMS roughness Rq2. In a mint condition, the roughness of the raceways Rq1 is 2 to 5 times higher than the roughness Rq2 of the at least one ball, as well as a refrigerant compressor comprising such a hybrid ball bearing.

Abstract: A Hybrid rolling bearing includes an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The outer raceway and the inner raceway are made from bearing steel, having a first surface RMS roughness Rq1. The rolling elements are made from a ceramic material and have second surface RMS roughnesses Rq2,i. At least one of the rolling elements has an increased surface RMS roughness Rq2,N, which is significantly higher than the RMS roughnesses Rq2,i, of the remaining rolling elements. The hybrid rolling bearing can be installed within a refrigerant compressor.

Abstract: A bearing assembly includes first and second rolling-element bearings each having first and second bearing rings, a raceway and a flange element at both ends of the raceways. Two of the flange elements are formed on a common flange body, and the flange body is axially pressed onto cylindrical mounting surfaces of the first bearing rings of the first and second rolling-element bearings and held in place by a press fit.

Abstract: The invention is directed to a rolling bearing having at least one row of cylindrical rolling bodies for transmitting axial forces between two annular connection elements which are concentric to a common axis of rotation and which, for the purpose of rotation about the common axis of rotation, are spaced apart from one another by a gap, wherein the at least one row of cylindrical rolling bodies is so arranged that, in the unloaded state of the rolling bearing, the axes of rotation of all the cylindrical rolling bodies of the row lie in a common plane through which the common axis of rotation passes perpendicularly, wherein at least one raceway for the at least one row of cylindrical rolling bodies is in the form of a flat surface of a wire which has on its surface region complementary to the raceway surface an arcuate, convexly curved cross-sectional profile and is thereby inserted at least in some regions into a peripheral recess having a cross-sectional profile complementary thereto in an annular connection

Abstract: A rolling element bearing includes inner and outer rings having raceways and rolling elements between the raceways. The raceways of the inner and outer rings are coated with a first coating, such as a phosphate coating, and the rolling elements are coated with a second, different, coating such as a black oxide coating.

Abstract: A rolling-element bearing assembly includes a rolling-element bearing and an oil conditioning system for conditioning oil used to lubricate the bearing. The bearing has an inner ring and an outer ring and a plurality of rolling elements rotatably disposed between the inner ring and the outer ring. The bearing includes openings for discharging oil from the bearing and for introducing oil into the bearing, and the openings are connected to the oil conditioning system. A raceway of the inner ring and/or a raceway of the outer ring is coated with a first coating, and the rolling elements are at least partially coated with a second coating that is different from the first coating.

Abstract: When inner diameter side opening portions are projected on an outer circumferential surface of a retainer along extension lines of central lines of radial holes, at least parts of the inner diameter side opening portions of a plurality of radial holes of an outer ring are positioned within an area of two circles formed by connecting each of axial end portions of adjacent pockets of the retainer in an axial direction. When a central line of any one radial hole coincides with a circumferential phase of a center of a ball, any other radial hole is formed such that the projected inner diameter side opening portion is separated from the ball and an inner circumferential surface of the pocket when viewed from the radial direction of the ball bearing, and a central line of the other radial hole overlaps with the pocket when viewed from the axial direction.

Abstract: An apparatus is provided for providing access to one or more axial proximity probes for monitoring axial position of thrust collars of a pump shaft to enable improved adjustment of the axial proximity probes by the pump operator. The apparatus includes a plurality of side walls configured to surround one or more axial proximity probes configured to measure axial position of one or more thrust collars in a pump bearing housing, at least one access window formed through at least one side wall of the apparatus configured to provide access the one or more axial proximity probes and at least one removable access plate configured to cover the at least one access window.

Abstract: A bearing assembly, such as for a wind turbine or a tidal turbine including a tower and a nacelle, includes a lower part that is attachable to the tower, an upper part that is attachable to the nacelle, a bearing that rotatably couples the lower part to the upper part to allow rotation of the nacelle with respect to the tower, and a brake mechanism configured to selectively prevent relative rotation of the upper part and the lower part. The brake mechanism includes a brake disc and a brake caliper.

Abstract: Constant velocity joints or homokinetic joints are used for the continuous transmission of rotational movements and torques. They transmit the rotational movement of a driving shaft to a shaft to be driven without changing the speed or torque. The transmission takes place independently of the speed, torque, or the value of a diffraction angle and independently of the speed at which this diffraction angle changes. Constant velocity joints with a diffraction angle of 90° are equipped with specially shaped gear pairs, which are held together by a spring-loaded inner joint. In this joint transmission, a diffraction angle of 90° is achieved while the shafts to be connected to fixedly mounted bevel- and spur gear pairs are connected to each other, so that no spring-loaded inner joint is needed. Therefore, high engine speeds and high torques can be transmitted.

Abstract: A coupling includes a driving disk connected to a driving shaft and rotatable about a driving axis. An engagement face of the driving disk includes a predetermined number of at least three driving teeth that are distributed azimuthally on the engagement face of the driving disk along a circle concentric to the driving axis. A driven disk connected to a driven shaft and rotatable about a driven axis has an engagement face including the predetermined number of driven teeth azimuthally distributed along a circle concentric to the driven axis. At least one of the driving shaft and the driven shaft possesses translational freedom or angular freedom of motion with respect to the other so that when the driving teeth of the driving disk engage the driven teeth, the driving axis and the driven axis are self-aligned.

Abstract: Various clutch adjusting assemblies for incorporating in drain cleaning machines are described. The assemblies enable adjustment or setting of a clutch in a drain cleaning machine without the use of tools.

Abstract: A plurality of annular clutch disks (12) is manufactured by blanking or die-cutting a flat sheet metal strip (2) during which the flat sheet metal strip (2) is advanced relative to a blanking or cutting tool along a feed direction between individual blanking or cutting processes with the blanking or cutting tool in order to form the annular clutch disks (12) from the flat sheet metal strip (2). Each of the annular clutch disks (12) is asymmetric with respect to a center point of a respective ring and includes an axis of symmetry (18) which is not orthogonal to the feed direction of the flat sheet metal strip. Each of the annular clutch disks (12) is axially symmetric at least to such an extent that each of the annular clutch disks (12) is installable in a multi-disk clutch (26) in precisely one first installation position (A) and in one second installation position (B). The second installation position results from the first installation position via turning over about the axis of symmetry (18).

Abstract: Systems and method for a two-way clutch are provided. In some configurations, the two-way clutch includes a driven member having a first mating surface, a drive member having a second mating surface, and a locking mechanism arranged between the first mating surface and the second mating surface. The locking mechanism is operable to contact the first mating surface and the second mating surface, in response to an outside force applied to the drive member that loads the locking mechanism. The two-way clutch further includes an engaging member. The engaging member provides a predetermined interference on the locking mechanism to hold the locking mechanism off of at least one of the first mating surface and the second mating surface, when the locking mechanism is in an unloaded state.

Abstract: A method for synchronizing a first drive element rotatable about an axis of rotation with a second drive element rotating about the axis of rotation at a target speed, of a powertrain of a motor vehicle, in which a synchronizing force is exerted on a synchronizing unit by an actuator. A speed, at which the first drive element rotates about the axis of rotation is adapted by the synchronizing unit to the target speed. The synchronizing force is increased during a first time span, so that the speed approaches the target speed. The synchronizing force is continuously reduced during a second time span following the first time span, before the speed corresponds to the target speed.

Abstract: A hydrodynamic clutch having an input side and an output side, the rotational motions of which are coupled to one another with a hydraulic fluid. A method for determining the degree of filling of the hydrodynamic clutch with fluid including steps of periodically sensing a fluid temperature of the hydraulic fluid, determining the thermal output supplied to the clutch on the basis of the temperature, determining a lambda value on the basis of the thermal output and determining the degree of filling on the basis of the lambda value.

Abstract: A viscous clutch according to the present invention, which is composed of a main body having a fluid storage chamber of a concave shape formed at a central portion thereof and a cover having a concave fluid operation chamber formed at a central portion thereof, comprises: a fan housing in which the main body is stacked on an upper side of the cover so that an opening of the fluid operation chamber can be covered; a drive shaft which extends in a vertical direction and has a lower end inserted through a bottom plate of the main body; a rotor fixedly coupled to the lower end of the drive shaft so as to be rotatable in the fluid operation chamber; a rotary assembly integrally coupled to the main body so as to cover an opening of the fluid storage chamber; a coil core mounted on an upper surface of the rotary assembly and generating an electromagnetic force when an electric current is applied from the outside; and a valve assembly for opening or closing a fluid outlet according to whether or not an electric curre

Abstract: Systems and method for a two-way clutch are provided. In some configurations, the two-way clutch includes a driven member having a first mating surface, a drive member having a second mating surface, and a locking mechanism arranged between the first mating surface and the second mating surface. The locking mechanism is operable to contact the first mating surface and the second mating surface, in response to an outside force applied to the drive member that loads the locking mechanism. The two-way clutch further includes an engaging member. The engaging member provides a predetermined interference on the locking mechanism to hold the locking mechanism off of at least one of the first mating surface and the second mating surface, when the locking mechanism is in an unloaded state.

Abstract: Provided is a centrifugal clutch having a simple configuration and configured so that a clutch capacity can be increased. A centrifugal clutch (200) includes a drive plate (210) to be directly rotatably driven by drive force of an engine. The drive plate (210) includes swing support pins (214) and protrusions (218). The swing support pin (214) is fitted in a pin slide hole (231) formed at a clutch weight (230), and swingably supports the clutch weight (230). The protrusion (218) includes a cylindrical roller, and contacts a driven portion (235) of the clutch weight (230). The pin slide hole (231) is formed in a long hole shape allowing the clutch weight (230) to displace backward in a rotary drive direction of the drive plate (210). The driven portion (235) is formed to extend inclined outward to a rear side in the rotary drive direction of the drive plate (210).

Abstract: A hydraulic control system of double piston clutch device configured for an automatic transmission, which includes clutch drum connected to one rotation element, a clutch configured in the clutch drum and configured to transmit rotation power in connection with another rotation element through a clutch hub, and a double piston in which first and second pistons are disposed in series to operate the clutch by hydraulic pressure while a front end is disposed to correspond to the clutch, may include a first hydraulic chamber formed between the first piston and the clutch drum to receive the hydraulic pressure through a first passage hole in a sealed state; and a second hydraulic chamber formed between the first and second pistons to receive the hydraulic pressure through a second passage hole in the sealed state and the hydraulic pressure separately controlled is supplied to the first and second hydraulic chambers, respectively.

Abstract: An arrangement for a multi-clutch assembly including a popoff valve is disclosed. The arrangement also includes a first clutch, a second clutch, and a spool valve assembly. Depending on the mode, the popoff valve either provides a flowpath for residual hydraulic fluid from a latching chamber of the spool valve assembly to a vent of the popoff valve, or provides a flowpath for supplying hydraulic fluid to the latching chamber of the spool valve assembly via a fluid connection from a supply inlet to a latch port of the popoff valve.

Abstract: A powertrain including a prime mover and an electronically controllable clutch. The powertrain structured selectably engages the clutch to provide power from the prime mover to drive one or more ground contacting wheels and to selectably disengage the clutch to decouple with one or more ground contacting wheels. The electronic control system operatively communicates with the prime mover and the electronically controllable clutch, and uses a predictive cruise control (PCC) controller and an idle coast management (ICM) controller, to control vehicle speed during concurrent operation of the PCC controller and the ICM controller.

Abstract: A method for controlling a pneumatic actuator (1) of a transmission having at least one sealing element (6, 7), arranged between two elements (2, 3) of the clutch actuator (1) that move relative to one another, and within a specifiable operating temperature range in which leakproofness of the clutch actuator (1) is ensured. The clutch actuator (1) is acted upon with compressed air from an air supply system for actuating a shifting and/or starting clutch arranged between a drive aggregate and a transmission. In order to warm up the clutch actuator (1), if a temperature of the clutch actuator (1) is lower then a glass transition temperature of the at least one sealing dement (6, 7), the drive aggregate is operated at a higher rotational speed compared to the idling speed of the drive aggregate.

Abstract: A clutch control device and a clutch control method are capable of preventing progress of wear and damage of a pneumatic clutch actuator. The clutch control device that controls the operation of a pneumatic clutch actuator to disconnect a clutch is characterized by setting a stroke amount of a piston corresponding to a disconnection position of the clutch as a final target stroke amount, setting other stroke amounts different from the final target stroke amount as intermediate target stroke amounts, and controlling the operation of the piston in a stepwise manner such that an actual stroke amount of the piston is matched with the intermediate target stroke amounts and is thereafter matched with the final target stroke amount, thereby disconnecting the clutch.

Abstract: A method for controlling a pneumatic actuator (1) of a transmission having at least one sealing element (6, 7) that is arranged between two elements (2, 3) of the actuator (1) that move relative to one another, and within a specifiable operating temperature range in which a leakproofness of the actuator (1) is ensured. The pneumatic actuator is acted upon with compressed air from an air supply system for actuating a transmission component. When a temperature of the actuator (1) is below a glass transition temperature of the at least one sealing element (6, 7), the actuator (1) is acted upon with pre-heated compressed air from the air supply system to warm up the at least one sealing element (6, 7) above the glass transition temperature.

Abstract: The invention relates to a braking and/or clamping device for a shaft guided in relation to a main body, comprising an actuation assembly and a shaft-coupling assembly. In this case, the actuation assembly comprises a split housing which has two bending plates which are elastically deformable in some regions. The bending plates each have tong jaws with friction surfaces, the respective surface normal of which are directed inwards. A sealed pressure chamber, which can be filled with a pressure medium, lies between the bending plates. Parts of a shaft-coupling assembly project between the clamping zones, said parts establishing the linking for the braked or clamped shaft. When the pressure in the pressure chamber is relieved, the frictional surfaces of the actuation assembly can be applied to the frictional surfaces of the shaft-coupling assembly, thereby producing the braking and/or clamping force.

Abstract: A brake caliper and method of manufacture. The brake caliper may have a first portion, a second portion, a first bridge and a second bridge that may be provided as a single casting. A first housing side may have a machined feature that may be axially aligned with a hole in the second portion.

Abstract: A brake caliper and a method of manufacture. The brake caliper may have a first portion, a second portion, a first bridge, and a second bridge that may be provided as a single casting. A brake pad backplate may have a projection that may be received in a hole of the second portion.

Abstract: A brake housing assembly including a brake housing and a bearing support. The brake housing may have a recess defining a recess axis, the recess having a base and a recess wall, the base defining a base contour. The bearing support may have a projection defining a bearing support axis, the projection having an end and a projection wall, the end defining an end contour corresponding to the base contour such that with the end in engagement with the base the end contour and base contour cooperate to align the bearing support axis with the recess axis.

Abstract: A single hand tool and method for removing and installing brake springs and brake shoes in any Class 8 Heavy Truck with 10-Lug Wheels, using 4707, 4709, Q, and Q+ shoes, that requires the use of larger, more robust tooling not associated with the light truck and automotive industry, due to the size of the components used in the manufactured units. The device aids in capturing and extending drum brake main springs and forceful removal of rear springs, and it uses existing parts of the drum brake assembly for leverage.

Abstract: A friction assembly has a support plate, at least one brake pad and at least one reinforcing foil of the plate. The brake pad and the support plate are co-moulded from at least one heat-resistant resin. The reinforcing foil is fixed to the support plate via anchoring projections, joined to and which extend away from the foil, embedded in the resin to prevent or limit deformations of the support plate in the use of the assembly.

Abstract: A pump device (10) includes: a drive unit (30); a cover body (150); a circuit board (130) which faces the cover body (150) and the drive unit (30) in an electrically non-contact state therewith; and a spring member (160) disposed across front and rear sides of the circuit board (130) and in contact with the cover body (150) and the drive unit (30) in an electrically conductive state. The drive unit (30), the spring member (160), and the cover body (150) constitute a static elimination path. The spring member (160) comprises: a spring deformation part (163) which enables spring deformation such that neighboring wires (161) can move toward or away from each other, and an electrically conductive bypass path (162) which is continuously disposed with at least one end of the spring deformation part (163) and is positioned across the front and rear sides of the circuit board (130).

Abstract: A coil spring integrally includes opposed extending ends to define a control rod for a damper. Thus, the spring and control rod are integrated into a one-piece structure. A friction rod damper includes a coil spring having a longitudinal axis, with the spring including a body and first and second extending ends which define a control rod for the damper. The extending ends terminate in attachments, and a damper member extends through the spring and having a first end secured to the first extending end of the spring in spaced relationship to the associated attachment. The damper member includes a second end with a container surrounding the second end of the spring in spaced relationship to the associated attachment. The container includes a damping element engaging the control rod to allow the spring to expand and contract under the damping action of the damping element.

Abstract: An illustrative example spring includes a curved shape body having a length. The body includes a cavity that extends along at least a majority of the length. The body has a cross-section across the length that is different at a plurality of locations on the body along the length.

Abstract: A grommet is formed by integrally fitting a substantially annular flange of a grommet interior to a substantially annular flange fitting groove of a grommet exterior. The grommet exterior includes a large-diameter cylindrical portion in which the flange fitting groove is formed inside, an anti-rotation rib that projects from the flange fitting groove toward inside of the large-diameter cylindrical portion, and a first reduced-diameter cylindrical portion that is provided on an attachment side of the grommet interior to the large-diameter cylindrical portion and that has a diameter smaller than that of the large-diameter cylindrical portion. The flange of the grommet interior is provided with a notch portion into which the anti-rotation rib is fitted. Further, the first reduced-diameter cylindrical portion includes a protrusion on the outer surface thereof that indicates the position of the anti-rotation rib.

Abstract: The current invention discloses several methodologies that mitigate shock loading and propensity to resonance in agricultural spray boom structures. These include a near planar linkage for decoupling the boom assembly from the vehicle. This serves to permit further aspects of the invention to: Use the combined mass of the booms and center section as the tuned mass of a tuned mass damper: Act as an enabling part of a boom compliant suspension system to mitigate shock loadings otherwise imposed on the boom system, and: Act as an enabling part of an active boom height and roll control systems to permit the accurate navigation of the boom over undulating terrain. Further aspects include the incorporation of tuned mass dampers in the boom structure and components; and the use of the mass and operation of the boom outboard “breakaway” sections as tuned mass dampers.

Abstract: A damper device includes: a case; a weight elastically supported in the case; and a second elastic member that is fixed to a surface of the case that faces the weight. The weight and the second elastic member are separated from each other, and a spring rate of the second elastic member has a nonlinear characteristic.

Abstract: A vibration damper for damping vibrations of a motor vehicle part including a retaining device attachable to the motor vehicle part, a damping mass, capable of vibrating with respect to the retaining device, and a spring device coupling the damping mass capable of vibrating to the retaining device. The damping mass may have at least one anti-loss device and/or path limiting device that may interact with the retaining device to limit a deflection of the damping mass with respect to the retaining device.

Abstract: A damper device includes a case that is filled with oil, a weight that is stored in the case and includes a central through hole, a central guide rod that is inserted into the central through hole of the weight and configured to allow the weight to slide in the oil, and at least one flow passage that is formed in the weight and through which the oil flows.