Abstract: A power transmission member is disclosed. The power transmission member allows a planetary gear mechanism to be reduced in volume while sufficient strength is guaranteed. A planetary gear holding part, a rotating shaft part, and a sun gear holding part constituting a power transmission member are formed integrally. The rotating shaft part is substantially cylindrical, and a planetary gear can be passed through the interior of the rotating shaft part and turnably mounted on the planetary gear holding part. An open window is formed in the planetary gear holding part, and a toothed part of the planetary gear is configured to mesh with a bearing-equipped outer gear through the open window.

Abstract: A transmission includes: a first input shaft selectively receiving power from an engine; a second input shaft receiving power from the engine; an output shaft disposed in parallel with the first input shaft; first and second countershafts, and first and second shift units; and a one-way clutch disposed in a power transmission line from the engine to the output shaft and through the second shift unit, transmitting power from the engine only to the output shaft. In particular, the first and second countershafts transmit power to the output shaft, the first shift unit carries out a series of desired gear shifts, and the second shift unit performs duplicate gear shifts one of which gear ratio is the same as one of gear ratios of the series of gear shifts made by the first shift unit.

Abstract: A transmission includes: first and second input shafts receiving power from an engine; an output shaft arranged in parallel with the first input shaft; first and second countershafts arranged in parallel with the first and second input shafts, respectively; a first shift unit making desired gear shifts between the first input shaft and the output shaft, and between the first input shaft and the first countershaft; a second shift unit arranged between the second input shaft and the second countershaft in order to perform of duplicate gear shifts; a power connection unit transmitting power from the first countershaft to the output shaft; and a one-way clutch transmitting power from the engine to the power connection unit through the second shift unit. In particular, each duplicate gear shift has a gear ratio substantially identical to at least one gear ratio of the gear shifts of the first shift unit.

Abstract: The present disclosure relates to an automotive multistage transmission that includes four planetary gear sets and six shifting members, and each of the planetary gear sets include three rotary members selectively connected to the six shifting members to transmit torque between input and output shafts, preferably so that the automotive multistage transmission provides ten or more forward shifting stages and one or more rearward one shifting stages with few parts and a simple configuration. In this configuration, the transmission can improve fuel efficiency of a vehicle.

Abstract: The present disclosure relates to a multi-stage transmission for a vehicle that includes four planetary gear devices and six shifting elements, and each of the planetary gear devices include three rotary elements selectively connected to the six shifting elements, preferably so that the multi-stage transmission provides at least ten forward shifting stages and at least one reverse shifting stage with a relatively small number of parts and a simple configuration. In this configuration, an engine may be operated at desired operation points, to improve the fuel efficiency of the vehicle and improve the quietness of the vehicle.

Abstract: The invention relates to a multi-speed automatic transmission in planetary design with one drive shaft (AN), one output shaft (AB), four planetary gear sets (RS1, RS2, RS3, RS4) and several shift elements (A to F). A first clutch shaft (3) constantly connects the first planetary gear set (RS1) to the fourth planetary gear set (RS4), a second clutch shaft (5) constantly connects the second planetary gear set (RS2) to the third planetary gear set (RS3), a third clutch shaft (6) constantly connects the third planetary gear set (RS3) to the first planetary gear set (RS1). The drive shaft (AN) is constantly connected to the fourth planetary gear set (RS4); the output shaft (AB) is constantly connected to the third planetary gear set (RS3).

Abstract: In a power transmitting apparatus for a hybrid vehicle, including a power split mechanism that splits or combines dynamic power and transmits the power between an engine and a drive shaft, and a transmission gear mechanism that changes a rotational speed of the engine through engagement and release of a clutch and a brake using hydraulic actuators, the transmission gear mechanism is formed as a transmission gear unit covered with a front cover and a rotary machine cover, and the transmission gear unit is mounted to a housing in which the power split mechanism and a motor-generator are disposed, while oil passages for shift control used for supplying hydraulic pressure to the hydraulic actuators are formed in the front cover or the rotary machine cover.

Abstract: Various techniques are provided to maintain drive belts at substantially constant tension over a wide range of conditions. In one embodiment, a system includes a housing, a bracket secured to the housing, first and second pulleys, and a belt engaged in tension with the first and second pulleys. The first and second pulleys are suspended from the housing through the bracket to reduce effects of thermal expansion of the housing on the belt tension. Other systems and related methods are also provided.

Abstract: A hydraulic auto-tensioner includes a cylinder with a sleeve fitting hole, and a sleeve press-fitted therein. A rod has its bottom end slidable in the sleeve. A return spring is mounted between a spring seat at an upper portion of the rod and a bottom surface of the cylinder. An oil passage, with a check valve, is formed between the fitting surfaces of the sleeve fitting hole and the sleeve and communicates the pressure chamber with the reservoir chamber. The rod has a valve fitting hole open to its bottom surface, and an oil passage communicating the valve fitting hole with the reservoir chamber. A relief valve, mounted in the valve fitting hole, includes a valve seat with a valve hole having an orifice for restricting the flow rate of oil released from the pressure chamber into the reservoir chamber through the oil passage when the relief valve opens.

Abstract: A tensioner comprising a first pivot arm having a first pulley journalled thereto and engagable with a mounting surface through a first pivot axis, a second pivot arm having a second pulley journalled thereto, the second pivot arm pivotally engaged to the first pivot arm through a second pivot axis, the second pivot axis disposed from the first pivot axis, a biasing member engaged between the first pivot arm and the second pivot arm urging the first pulley toward the second pulley, and the second pivot axis is between the first pulley and the first pivot axis.

Abstract: A hydraulic auto-tensioner includes a plunger fitted to a bottom end portion of a rod so as to be slidable along a radially inner surface of a valve sleeve and a radially outer surface of the rod. The plunger has a bottom plate formed with a valve hole. A first leakage gap is defined between sliding surfaces of the plunger and the valve sleeve, and a second leakage gap of which the flow resistance is lower is defined between sliding surfaces of the plunger and the rod such that while the engine is running normally, oil in a pressure chamber leaks into a reservoir chamber through the second leakage gap, and when starting the engine by actuating a starter/generator, the plunger rises until the valve hole is closed so that oil in the pressure chamber leaks into the reservoir chamber through the first leakage gap.

Abstract: In one aspect the invention relates to a tensioner that is capable of precognitively anticipating when it is desirable to increase the tension in a belt or other endless drive element so as to prevent belt slip prior to events that would raise the risk of it.

Abstract: Construction is achieved whereby durability is maintained while size and weight are reduced. Installation plate sections are provided on the top and bottom end sections of a pair of support columns. Bolts are inserted through through-holes that penetrate through the installation plate sections in the axial direction; the bolts are then screwed into screw holes provided in the axial direction of anchor sections of an actuator body and a connecting plate, and the bolts are further tightened, whereby the support columns are securely joined and fastened to the actuator body and the connecting plate.

Abstract: An outer race assembly for a continuously variable transmission includes a hydraulic cavity housing, a first radially outer race structure spaced along an axis from a second radially outer race structure to form a radially outer race, and planetary members in rolling contact with the radially outer race. The first radially outer race structure includes nesting engagement with the hydraulic cavity housing, and a hydraulic cavity sealed between the hydraulic cavity housing and the first radially outer race structure to control axial movement of the first radially outer race structure.

Abstract: A continuously variable transmission includes a radially inner race, having a first radially inner race structure and a second radially inner race structure spaced along an axis wherein at least one of the first radially inner race structure or the second radially inner race structure is axially movable. The transmission further includes a radially outer race, having a first radially outer race structure and a second radially outer race structure spaced along an axis wherein at least one of the first radially outer race structure or the second radially outer race structure is axially movable, planetary members in rolling contact with the radially inner races and the radially outer races, and an outer race assembly that includes a hydraulic cavity housing, a hydraulic cavity sealed between the hydraulic cavity housing and the first radially outer race structure to control axial movement of the first radially outer race structure.

Abstract: A radially inner race for a continuously variable transmission includes a first inner race structure and a second inner race structure spaced along an axis wherein at least one of the first inner race structure or the second inner race structure is axially movable. A sun shaft is coupled to the radially inner race and planetary members in rolling contact with the radially inner race, and a torsion damping mechanism is coupled to the first inner race structure to apply torque between the first inner race structure and the sun shaft to reduce a transition amplitude during a torque impulse.

Abstract: A latching device (1) for vehicles capable of engaging with and disengaging from a rod-like portion (P1) to lock and unlock the latching device (1) includes: a casing (2) at least partly formed by a first member made of a first material and having an insertion groove (2A) for allowing the rod-like portion to be inserted thereinto; and a second member (latch (30) or reinforcement plate (20)) made of a second material and configured to contact the rod-like portion (P1). The second material has a higher specific gravity and a higher modulus of elasticity than the first material. For example, the first material is resin, whereas the second material is metal.

Abstract: A linear actuator includes an actuator including a housing, a power drive mounted at one end of the housing, a screw rod axially disposed in the housing, a connection member connected between the screw rod and the power drive, a sliding block threaded onto the screw rod, and a push rod affixed to the sliding block and extending out of the housing, and a resistance scale including a resistance substrate affixed to an inner wall of the housing at an inner bottom side and a electric brush affixed to a bottom side of the sliding block and kept in contact with the resistance substrate.

Abstract: A disengageable lead screw nut assembly for a lead screw assembly is provided. The disengageable lead screw nut assembly includes a housing, and first and second electromagnets mounted on opposing sides of the housing. First and second lead screw nut parts are arranged in proximity to the respective first and second electromagnets, the first and second lead screw nut parts are movable between a first, lead screw engagement position, and a second, disengaged position. Springs are located in the housing that bias the first and second lead screw nut parts toward one of the first and second positions, and the lead screw nut parts are movable against a force of the respective springs to the other of the first and second positions upon activation of the electromagnets. In the first, lead screw engagement position, a lead screw engagement path is defined between the first and second lead screw nut parts.

Abstract: An improved split power path transmission with a combiner is disclosed which comprises an input power splitter that splits input power between at least one fixed-ratio mechanical power path and at least one variable-ratio power path. The outputs of the fixed-ratio and variable-ratio power paths are combined by coupling their outputs to a combiner. The transmission also comprises a multi-speed drive assembly comprising at least two selectable gear ratios. The transmission can be made more compact by incorporating the multi-speed drive assembly between the input and output of the variable-ratio power path.

Abstract: A transmission for a vehicle may include a first input shaft selectively receiving power from an engine, a second input shaft continuously receiving power from the engine, a first output shaft and a second output shaft disposed in parallel to the first input shaft and the second input shaft, respectively, a first shift device configured to make a series of desired gear shift ranges between the first input shaft and the and the first output shaft and between the first input shaft and the second output shaft, and a second shift device configured to make duplicate gear shift ranges, which have a gear ratio identical to a gear ratio of one or more gear shift ranges of the series of gear shift ranges made by the first shift device, using the second input shaft.

Abstract: A torque converter turbine core ring is provided. The turbine core ring includes a plurality of arc sections having an inner circumference and an outer circumference and a plurality of weakened sections connecting the arc sections to each other. The weakened sections each having a lesser strength than each of the arc sections. A torque converter turbine, a torque converter and a method of forming a torque converter turbine are also provided.

Abstract: The present invention relates to torque transfer and torque limiting system technology and applications. This invention relates to providing improved torque limiting systems that employ tolerance rings for controlling transmitting power between a single power-input shaft and one or more power-output shafts, which can protect mechanical equipment and drivetrains from damage by mechanical overload. Relating to motor vehicle differentials, the present invention can control differentiation between two power-output shafts, or drive shafts by providing friction internal to said differential and limit “undesirable” slip or differentiation between wheels, as might occur when one wheel encounters a low-traction condition, providing a limited-slip differential.

Abstract: A rotor for a cam phaser, the rotor rotating about a rotation axis and the rotor including a first face; a receiving face arranged opposite to the first face; a central portion; at least one lobe that is arranged at the central portion and which extends away from the central portion in a radial direction; and a cam shaft receiving recess provided at the receiving face and configured to receive a cam shaft, wherein the cam shaft receiving recess includes an inside surface, wherein at least two cam shaft centering elements are arranged at the inside surface for centering the cam shaft, and wherein the cam shaft centering elements are configured as protrusions. The invention also relates to a joining kit.

Abstract: A mechanical system forming a cam follower or a rocker arm. The mechanical system includes a support element, a pin extending between two opposite ends along a first axis and supported by the support element, and a roller mounted on the pin, movable in rotation relative to the pin around the first axis and adapted to roll on a cam The support element includes a hollow cylindrical wall delimiting a cavity in which the pin and the roller are housed. The wall has two edges perpendicular to the first axis, wherein the two edges are joined together.

Abstract: A method for collaboratively constructing a column envelope profile of two flanks of a star wheel tooth includes steps of: determining a tooth width B of a star wheel according to a diameter of the star wheel and a dimension of a root circle; thereafter, geometrically representing positions and shapes of the two flanks of each star wheel tooth of the star wheel by two base columns having parallel axes and the same diameter; wherein: the axes of the base columns are parallel with a center line of the star wheel tooth; on a section of a tooth top of the star wheel tooth, a local projection of a first base column close to a front flank of the star wheel tooth is projected on a lowermost part of a projection of the front flank of the star wheel tooth; and a local projection of a second base column close to a back flank of the star wheel tooth is projected on an uppermost part of a projection of the back flank of the star wheel tooth.

Abstract: An idle gear assembly comprises an outer ring having gear teeth formed on an external surface thereof and engaged with a crank gear and any one of the left and right balance gears. A bearing includes an inner member and an outer member in a radial direction of the bearing and a plurality of rolling bodies disposed between the inner member and the outer member. A ring has elasticity in a radial direction thereof. A hub has a flange, which is in contact with the bearing, and a penetration hole. The flange and the penetration hole are formed at one side of the hub in an axial direction. A nut is inserted through another side and mounted at a hollow portion of the ring. A bolt is inserted through the insertion hole of the bearing, the penetration hole, and the nut and fixes the bearing and the hub.

Abstract: A gear includes a toothed portion, a boss, a first connector, a second connector, and a dynamic damper. The toothed portion is disposed at a radially outer side of the gear. The boss is disposed at a radially inner side of the gear. The first connector connects the toothed portion and the boss. The second connector connects the toothed portion and the boss. The second connector faces the first connector such that the toothed portion, the boss, the first connector, and the second connector define a sealed space. The dynamic damper is disposed in the sealed space.

Abstract: A variety of scissors gear assemblies are disclosed that utilize integral parts or common tools to align teeth of the scissors gear assembly. Methods of use are also disclosed.

Abstract: Disclosed is a drive mechanism for driving a spin test rig, comprising a transmission casing (1) which accommodates a transmission gear unit (8) having a vertical output shaft (10) and an input shaft (9) coaxial therewith. The output shaft (10) has an upper end arranged in the transmission gear unit (8) and a lower end adapted to be coupled to a test object. The transmission casing (1) includes a casing lower part (4) detachable therefrom with the gear unit installed, in which casing part the output shaft (10) is axially and radially carried in bearings (28, 29) at a distance from its ends. The transmission gear unit (8) is configured such that the output shaft (10), together with the casing lower part (4) and the bearings arranged therein, is removable from the transmission casing (1).

Abstract: A power transmission device that includes a transmission; a transmission case that accommodates the transmission; a counter drive gear to which power from the transmission is transmitted; a brake that holds one of rotary elements of the transmission stationary to the transmission case such that the rotary element cannot rotate; and a support member that includes a cylindrical boss portion rotatably supporting the counter drive gear, a wall portion extended outward in a radial direction of the transmission from one end of the boss portion, and a cylindrical drum portion extended in the same direction as that of the boss portion and in an axial direction of the transmission from the wall portion and functioning as a brake drum of the brake, and that is fixed to the transmission case, wherein the boss portion, the wall portion, and the drum portion are formed integrally.

Abstract: A gearbox in a gas turbine engine includes an enclosed gearbox housing, at least a pair of intermeshing gears lubricated and rotatably supported within the gearbox housing, and a baffle apparatus axially spaced apart from and positioned at least at one side of the pair of gears, the baffle apparatus including a collector defining a main opening adjacent a meshing point of the intermeshing gears for collecting and redirecting lubricant squeezed out axially from the intermeshing gears.

Abstract: A two-speed automatic planetary transmission, including a sun gear, dual planet gears, a planet carrier, a ring gear, a band-type brake ring, and a locking ring. The locking ring is disposed between the outer surface of the ring gear and the inner surface of the annular lug boss, and the inner surface of the locking ring is fixedly connected to the outer surface of the ring gear. Part of the outer surface of the locking ring contacts with the inner surface of the annular lug boss, and another part thereof is sheathed with the band-type brake ring. One end of the band-type brake ring is a fixed end, and is fixedly connected to a transmission shell; and another one is an unfixed end which is connected to a gear shifting actuator.

Abstract: In a shift device, a lever is pivoted to change a shift position of the lever. A printed wiring board detects a magnetic force generated by a magnet of the lever to detect the shift position of the lever. Note that the lever is biased by a compression coil spring to suppress separation between the magnet and the printed wiring board when the lever is pivoted. This accordingly enables excellent detection of the magnetic force of the magnet by printed wiring board, and enables the detection accuracy of the shift position of the lever to be improved.

Abstract: In a shift lever device, a first facing cavity and a second facing cavity of a lever, and a first facing hole and a second facing hole of a printed wiring board, respectively face each other when the lever is disposed in an “H” position. Thus, in a state in which the lever is disposed in the “H” position when the shift lever device is being assembled, the first facing cavity and the second facing cavity respectively face the first facing hole and the second facing hole, thereby enabling the accuracy of relative assembly positions of a magnet of the lever and detection elements of the printed wiring board to be increased, and enabling the detection accuracy of a shift position of the lever to be improved.

Abstract: A hydraulic control device for an automatic transmission, wherein when the first switching valve is switched to the first state while the second switching valve is in the third state, the reverse range pressure applied from the reverse range pressure input port of the second switching valve can be supplied from the first output port to the hydraulic servo for the first friction engagement element via the fourth output port of the second switching valve and the first input port of the first switching valve, and when a shift range is shifted from a neutral range to a reverse range, the second switching valve is in the fourth state, and the first switching valve is switched from the first state to the second state, so that the reverse range pressure applied to the reverse range pressure input port is cut off by the second switching valve.

Abstract: A hydraulic control device (101) for controlling multiple torque-transferring shift elements (K_A, K_B, K_C) of an automatic transmission, whereas each of the shift elements features at least one hydraulic actuator (4A, 4B, 4C), which includes one actuating pressure chamber (7A, 7B, 7C), features at least one stop valve (110) and at least one hydraulic shift device (8) with multiple pressure adjusting devices (23A, 23B, 23C) allocated to the different shift elements. Thereby, the stop valve is formed and arranged in such a manner that the actuators of at least two shift elements are hydraulically connectable to the pressure adjusting devices through a common stop valve, whereas, in a first shifting position of the stop valve, all actuating pressure chambers of the at least two shift elements are tightly sealed by the stop valve.

Abstract: An automatic transmission control device with which it is occurrence of meshing failure at the time of engaging an engagement clutch may be prevented while suppressing prolonged time for completing the engagement. Disclosed is an automatic transmission control device comprising: an automatic transmission that is provided in the drive system of a vehicle and that includes, as an coupling element, an engagement clutch which undergoes meshing/engagement at the time of coupling; and a transmission controller that performs transmission control of the automatic transmission. The engagement clutch includes: a clutch gear connected to a transmission input shaft; and a clutch hub connected to a transmission output shaft and capable of meshing with the clutch gear.

Abstract: A transmission and control method are disclosed which ensure proper stroke pressure and minimize torque transients during a shift event. The transmission includes a clutch having a torque capacity based on a fluid pressure, a torque sensor adapted to measure a torque value that varies in relationship to the torque capacity, and a controller. The method includes varying the fluid pressure around a predetermined value, measuring a resulting torque difference with the torque sensor, and adjusting a clutch control parameter if the resulting torque difference is less than a threshold value.

Abstract: A hydraulic control apparatus, wherein the first switching valve receives an input of one of the hydraulic pressure from the first electromagnetic valve device and the predetermined hydraulic pressure from the third switching valve, as a switching signal pressure, the first switching valve is switched from the first state to the second state in response to the input of the switching signal pressure, and the first switching valve is held in the second state, and the second switching valve receives an input of one of the hydraulic pressure from the first electromagnetic valve device and the predetermined hydraulic pressure from the third switching valve, as a holding pressure for holding the normal supply state.

Abstract: A control device (12) for a stepped transmission mechanism is configured to perform an interlock by engaging a first clutch (32) and increasing hydraulic pressure of a second clutch (33) up to a first predetermined pressure (P1) such that an output shaft of the transmission mechanism is fixed, after an idle-stop condition including at least a requirement that a vehicle is stationary was satisfied and before a stop of an engine (1). The control device includes a gradient detecting means (12a, 47) that detects a gradient (R) of a road surface on which the vehicle is stationary; and a hydraulic control means (12c) that performs a slipping interlock by reducing the hydraulic pressure to a second predetermined pressure (P2), if the gradient R detected by the gradient detecting means is lower than or equal to a predetermined value (RTH) during the interlock and before the stop of the engine.

Abstract: A shift lock-out device is used with a gearbox containing one or more gears and a clutch mechanism that is operable to selectively engage the one or more gears to provide first and second gear ratios. The shift lock-out device includes a housing having an inlet port that communicates with a source of pressurized fluid and an outlet port that communicates with the clutch mechanism. A valve element is supported within the housing for movement between an opened position, wherein fluid communication is permitted from the inlet port to the outlet port, and a closed position, wherein fluid communication is prevented from the inlet port and an outlet port. A pilot control valve selectively permits and prevents the application of pressurized fluid from a pilot fluid source against the valve element to selectively move the valve element between the opened and closed positions.

Abstract: There are provided a continuously variable transmission (CVT) in which a belt (7) is wound around a primary pulley (5) and a secondary pulley (6) to transmit power; a primary pulley rotational speed sensor (13) for detecting a rotational speed of the primary pulley (5); a vehicle stopped state determination means for determining whether a vehicle is in a stopped state; a belt slippage detection means for detecting belt slippage on the basis of a signal of the primary pulley rotational speed sensor (13); and a prohibition means for prohibiting detection of the belt slippage by the belt slippage detection means when a parking range or a neutral range is selected by a shift lever operation by a driver. In the vehicle stopped state during selection of the parking range or the neutral range, the rotational speed of the primary pulley (5) is not basically output, and the belt slippage does not occur.

Abstract: A neutral controlling method of a synchronizer includes: a primary moving step of moving a sleeve in one direction by a shift mechanism until the sleeve contacts a first stopper of a first clutch gear; a secondary moving step of moving the sleeve in the other direction by the shift mechanism until the sleeve contacts a second stopper of a second clutch gear; and a neutral position moving step of moving the sleeve to a neutral position between the two clutch gears. In particular, in the neutral position moving step, the sleeve moves in one direction as much as a half of a stroke and the stroke of the sleeve is a summed value of a straight distance between the first stopper and the second stopper with an invalid stroke formed due to a clearance between parts of the shift mechanism and the synchronizer.

Abstract: An actuator for actuating a transmission to select a transmission ratio and to engage or disengage the selected transmission ratio and/or for actuating at least one clutch, with a cylindrical control element on which a first ring element for controlling the clutch, a second ring element as a drive element, a third ring element for shift control, and a fourth ring element for shift operation are disposed for rotation, wherein the first ring element is connected to a clutch for actuating the clutch upon a rotation of the first ring element, the second ring element is connected to a drive for rotating the second ring element, the third ring element is provided with actuating means interacting with corresponding actuating means of the first, second, and fourth ring element, and wherein the fourth ring element is connected to shifting elements of a transmission for shifting a transmission ratio.

Abstract: A mass spectrometer is disclosed comprising a first component, an annular vacuum chamber seal and a second component. The first component has a groove. The annular vacuum chamber seal comprises a main body portion and one or more blade or rib portions which protrude from the main body portion. The main body portion is located in the groove and the one or more blade or rib portions protrude above or beyond a surface of the first component. The second component is slid, in use, along the surface of the first component thereby deforming the one or more blade or rib portions so that the one or more blade or rib portions form a radial, diametric or piston seal between the first and second components.

Abstract: A seal system (1) for use in mixing apparatus (2) comprising a rotating shaft (3) which passes through a fixed structure (4), the seal system (1) being adapted both to prevent egress of content from the apparatus, and to resist ingress of material into the seal system.

Abstract: A packing seal is provided for a system for sealing the shaft of a primary motor-driven pump unit of a nuclear reactor, intended to ensure sealing between the primary circuit and the atmosphere. The packing seal includes a rotary active surface and a floating active surface, and a face of the floating active surface and/or the rotary active surface is covered by a protective layer made from a material having surface energy greater than 30 mJ/m2 and an electron donor component less than 15 mJ/m2.

Abstract: The object of the present disclosure is to accomplish a stable sealing performance while maintaining the durability. A mating ring (120) includes a sliding portion (121) having a sliding surface that slides against a sealing ring (110) within an end surface on an atmosphere side (A) thereof in an axial direction of a shaft (200), and a retained portion (122) that extends from a radially outward end portion of the sliding portion (121) toward a sealed-fluid side (F) in the axial direction and is retained by a sleeve (130). A mechanical seal (100) includes an annular holder (500) that is fixed to the sleeve (130) receives pressure from an O-ring (140) that receives, from the sealed-fluid side (F) in the axial direction, a fluid pressure (P) of a fluid to be sealed that flew into a space created by a flange portion (132) of the sleeve (130) and the retained portion (122) of the mating ring (120).

Abstract: A cylinder device includes; a cylinder; a rod protruding from the cylinder; an annular member formed at one end side of the cylinder; an annular closing section formed further outward in a cylinder inward/outward direction than the annular member to close the one end side of the cylinder; and an annular seal ring provided inward in the cylinder inward/outward direction from an outer circumferential side of the closing section. The seal ring includes: a front end side outer circumferential seal section; a base end side outer circumferential seal section; a front end side inner circumferential abutting section; and a base end side inner circumferential abutting section. At least one set of seal sections or abutting sections is constituted by convex sections protruding in a radial direction.