Abstract: To provide a tensioner in which a bearing of the drive shaft of the conventional art is not necessary and also that enables the initial load of the torsion spring to be retained in an intact condition when the tensioner is disassembled for maintenance purposes or the like.

Abstract: A method and a device for preventing seeping liquid from entering equipment along a connecting line such as an electrical line or a pipe line are disclosed. The method is performed by using a liquid-insulating device surrounding a section of the connecting line to stop the liquid from crossing thereover to reach the equipment. The liquid-insulating device is made of a liquid-proof material, and preferably includes a guiding member to guide the liquid stopped thereby to flow away from the connecting line.

Abstract: A hydraulic tensioner for an engine timing chain includes a housing having a bore. The end portion of a plunger is slidably fitted into the bore. The end of an oil inlet provided in an engine block is fitted with a seal cap having a C-shaped cross section and an outside concavity. The hydraulic tensioner utilizes the concavity as an oil reservoir. Oil passages are formed in the housing to connect an oil chamber with the concavity. The seal cap has an orifice to connect the oil inlet with the concavity. The present invention results in decreased space occupied by and reduced manufacturing cost for a hydraulic tensioner having an oil reservoir.

Abstract: A bicycle includes a conventional pedal crank and chain drive together with a conventional derailleur shifting mechanism operative to selectively transfer the drive chain between alternative rear sprockets of the bicycle drive system. A chain ring is rotatable in response to pedal crank rotation to transfer pedal crank power to the rear sprockets. A pair of guide blocks define respective internal guide channels through which the drive chain passes toward and from engagement with the chain ring. The guide blocks are maintained at their respective positions by a guide support plate secured to the bicycle frame.

Abstract: A chain tensioner apparatus and a method for mounting the chain tensioner apparatus to an engine component is disclosed. The chain tensioner apparatus includes a bracket having a first surface and a second surface, and a pivot pin secured to the bracket. The pivot pin includes a first portion extending from the first surface and a second portion extending from the second surface. A shoe sub-assembly is pivotally mounted to the pivot pin first portion. The method includes the steps of inserting the pivot pin second portion into a bore associated with the engine component, and securing the bracket to the engine component with a fastener.

Abstract: The invention comprises a self-contained mechanical belt tensioner that produces damping which is a function of the applied hubload through the effect of frictional forces derived from the sliding action of mutually opposing wedges. A first wedge or conical piston is contained within a housing. The conical piston cooperates with a second or conical wedge. A surface of the conical wedge slides on the inner surface of the housing. The conical wedge is expandable in a direction normal to the inner surface of the housing. A spring urges the conical wedge into engagement with the conical piston. As the pulley is loaded, as with an impulse load, the piston will move into the conical wedge. This, in turn, will cause the conical wedge to expand against the inner surface of the housing. The expansion of the conical wedge in the housing will increase the frictional force between the conical wedge and the housing. This will have the effect of damping movements of the conical piston and, in turn, of the pulley.

Abstract: A tensioner for a chain, includes a tensioner piston bearing upon a chain and guided by a cylinder for movement in the direction of the chain. The cylinder and the piston define a pressure chamber for receiving hydraulic fluid, wherein hydraulic fluid is able to escape from the pressure chamber via a leakage gap. A control member is provided to at least reduce the leakage gap in size, when a pressure in the pressure chamber increases.

Abstract: This tensioner comprises a casing, a first shaft member rotatably stored in the casing so as to be restrained from moving in its axial direction, a second shaft member in screwed engagement with the first shaft member, and a spring for applying a turning force to the first shaft member. The second shaft member is restrained from rotating relatively to the casing and allowed to move in the axial direction. An axial load from a force transmitting member, such as a chain or belt, acts on the first shaft member. An end face of the first shaft member touches a receiving surface of the casing across a washer. The end face receives the axial load that acts on the second shaft member. The flatness of at least the end face of the first shaft member is adjusted to 15 &mgr;m or less.

Abstract: A tensioner device having a tensioner and a lever urged by the tensioner into slide contact with a chain includes a plunger rotation inhibiting mechanism disposed between the front end portion of a plunger and a portion of the lever to inhibit the plunger from rotating about the axis thereof such that the front edge of each prong of a ratchet is kept separated from the bottom land of a mating one of rack teeth formed on an outer surface of the plunger along the axis thereof. The ratchet prong is substantially free from wear and has an improved degree of durability.

Abstract: A chain tensioner, includes a housing intended for attachment to a stationary machine element of an internal combustion engine, and a piston received in the housing for axial displacement against a strand of a chain to thereby implement a tensioning of the chain. An adjusting mechanism is provided for moving the housing relative to the machine element in a direction to and away from the strand of the chain, whereby a spacer establishes a distance between the housing and the strand to thereby define an installation position of the housing.

Abstract: The present invention is a control apparatus for an implement transmission. The transmission is operably coupled to a plurality of driven mechanisms for providing a driving power from a prime mover to the plurality of driven mechanisms. A shift assembly has a first and a second actuator apparatus. The first actuator apparatus is operably coupled to the transmission for selectively controlling the transmission of a driving power to at least a first driven mechanism, and the second actuator apparatus is operably coupled to the transmission for selectively controlling the transmission of a driving power to at least a second driven mechanism. The second actuator apparatus has a biasing apparatus for exerting a variable, selective bias on the transmission. A clutch for selectively engaging and disengaging a prime mover and the transmission has a rotatable stop member and an idler-stop assembly.

Abstract: A variable speed drive system is provided for use in driving accessories. The system is driven by a rotational member, which can be a component of an engine or any other rotating device. The system includes two pulleys rotationally connected by a first belt. In order to change the speed of the second pulley the pitch radius of the first pulley can be varied by an actuating system which can be located remotely from the pulleys. The second pulley maintains tension within the first belt and drives accessories via a second belt. The system has infinitely variable speed control between minimum and maximum pitch ratios.

Abstract: A high output light source, such as a stage lighting luminaire, produces light along a path. The belt which drives a driven device is kept away from that path by passing it around the opposite side of the pulley.

Abstract: A drive belt tensioning method and assembly using a spring loaded, non-active tensioner. The spring is mounted between a base plate, and a tensioner arm, both of which rotate. A belt tensioning pulley is mounted on the tensioner arm, such that the belt tensioning pulley is adjacent to the drive belt. The tension of the spring causes the tensioner arm to rotate which causes the belt tensioning pulley to tension the drive belt. The spring chosen has a predetermined working length at which the drive belt has the desired tension. Because both the base plate and the tensioner arm rotate, the spring may be kept at this predetermined working length for each belt adjustment. This enables the drive belt to maintain the desired tension. An alignment index integral to the assembly may be used to ensure that the spring is at the predetermined working length.

Abstract: A chain guide includes an angle-like guide base having a single mounting portion bolted to a mount surface on the interior side of an endless chain and projecting to the exterior side of the chain through a space defined between the chain and the mount surface. A shoe supporting portion of the angle guide base projects perpendicularly from an exteriorly projecting end of the mounting portion and is provided with a plurality of nose locking projections spaced in a direction of travel of the chain. A guide shoe is provided with a plurality of generally hook-shaped resilient locking prongs projecting from a rear surface on a side opposite to a shoe surface. The locking prongs are snap-fitted with the locking projections to attach the guide shoe to the guide base with the shoe supporting portion held between the rear surface of the guide shoe and the locking prongs. The angle guide base is highly rigid and hence is able to suppress vibration and noises generated while the chain is running.

Abstract: A control tensioner device for adjusting and maintaining the tension in a flexible linkage in an engine includes a retainer having a central passageway extending therethrough. At least a portion of the central passageway contains a first set of threads. The control tensioner device further includes an adjustment element having a second set of threads. The adjustment element is sized to be threadably received within the central passageway. The adjustment element is adapted to apply pressure on the flexible linkage to maintain the tension. The first set of threads and second set of threads are sized to permit minor relative movement between the retainer and the adjustment element. Furthermore, the first set of threads and second set of threads are sized to be borderline self-locking such that the first and second sets of threads engage in response to minor relative movement between the retainer and the adjustment element.

Abstract: A tensioner comprises shaft members that mate with each other by means of thread portions. A first shaft member is rotatable with respect to a casing and is restrained from moving in its axial direction. A second shaft member, which is restrained from rotating with respect to the casing, is movable in its axial direction. A torsion spring applies torque in a first direction to the first shaft member. A torque switching member, which can switch frictional torque in association with the rotation of the first shaft member, is provided between the first shaft member and the casing.

Abstract: A traveling screen system has a traveling screen guided about a multiplicity of support and guide rollers. A scanning device scans a transverse position of the traveling screen and an adjusting device adjusts the angular orientation of at least one of the support and guide rollers. The adjusting device is supported on one side on a displaceable bearing block which is supported on a carriage. Between the control device for the bearing block of the displaceable roller and the scanning device, a coupling is provided by which a return of the control motion of the roller to the scanning device is effected. The coupling is formed by a Bowden cable, by a hydraulic circuit with control cylinders, or by an electric circuit with control devices.

Abstract: A bicycle shift control device for controlling a gas actuated shifting device includes a housing; a first gas valve actuating member; a second gas valve actuating member; a first shift member coupled to the housing for movement in a first direction, wherein the first shift member is operatively coupled to the first gas valve actuating member; and a second shift member coupled to the housing for movement in a second direction, wherein the second shift member is operatively coupled to the second gas valve actuating member.

Abstract: A structure for mounting a motor of a planing machine includes a hollow base, an axle casing fitted in said base and provided with a spindle for connecting with a planing cutter, a first pulley arranged under said spindle so that a belt connects said first pulley with a second pulley of a motor, wherein said axle casing is provided at a bottom with an extension having a circular hole and a curved groove subtending the center of the circular hole, a motor cover is installed on one end of a motor and has a pair of lugs in which is fitted an end of said extension, a pin is inserted into said lugs and said circular hole to form a pivot therebetween, and a locking handle is threadedly engaged with one of said lugs so that said motor is fastened on one side of said axle casing.

Abstract: A variable speed drive comprising two drives, an output drive wheel and an endless, extendible member that is driven by the drives and extends around and rotates the output drive wheel. The drives are operable to move the endless member around an endless path at a first speed at a first driving position and at a second speed at a second position. This causes local expansion or contraction of the endless member around the output drive wheel and so varies its speed.

Abstract: A tensioning device for a chain or a belt drive for a motor of a hand machine tool, especially for a chain saw or a grinding or abrasive cutting-off machine, with a longitudinally movable bracket, such as a bracing or an arm, which can be fixed together with a cover with at least one bolt with a screwable nut to a casing or to another part of the hand machine tool, whereby the tensioning device has an adjusting screw extending in the longitudinal direction of the bracket on which a rider screw is movable to-and-fro by rotating the adjusting screw, the rider screw having a trunnion extending through an opening of the bracket so that, for tensioning the chain or the belt drive, the bracket follows a movement of the rider screw.

Abstract: In pressing a slack-side span of a V-ribbed belt, entrained about a crank pulley variable in rotational speed, auxiliary pulleys and an idler pulley, with an auto tensioner, thereby automatically balancing tension of the belt, the damping coefficient DI of the auto tensioner is set in accordance with the modulus of longitudinal elasticity of the belt. For example, when the modulus of longitudinal elasticity of the belt is at least 9800 N/100% rib and less than 29400 N/100% rib, the damping coefficient DI of the auto tensioner is set at at least 20% and less than 100%. In this manner, even if the rate at which the auto tensioner absorbs elongation of the belt is as extremely small as 0.3 to 1.0 mm/deg, a rocking motion of the auto tensioner can be avoided thereby reducing the occurrence of a slip or a frictional sound of the belt and the occurrence of abrasion and frictional sounds of friction members, such as an insert bearing and a thrust washer, of the auto tensioner.

Abstract: In mounting an engine (vertical crankshaft internal combustion engine) to a frame (support) through a plurality of vibro-isolating members, at least one vibro-isolating member is a vibro-isolating member which is disposed at a position where the tension and rotating torque of a belt wound around an output pulley are substantially perpendicular to each other, or a vibro-isolating member disposed on a flat surface which includes an output shaft therein and is in parallel to the tension. Alternatively, the vibro-isolating members are disposed symmetrically through a flat surface which is in parallel to the output shaft and the tension of the belt and includes therein the center of gravity, or at least one vibro-isolating member is disposed on the flat surface. Also, an axis of the vibro-isolating members is oriented to correspond to a direction of the rotating torque.

Abstract: A belt tension adjusting device is provided which even if the slide bearing is heated to a high temperature by heat of an automotive engine, it is less likely to get worn and the fulcrum shaft will not seize. The belt tension adjusting device has a stationary fulcrum shaft, an arm pivotally supported on the fulcrum shaft through a slide bearing formed of a synthetic resin, a tension pulley mounted on the arm at one end thereof for tensioning a belt, and a damper having a piston rod abutting the arm on the other end thereof. The tension pulley is pressed against the belt by pivoting the arm under the force of the piston rod, thereby adjusting the tension of the belt. The inner peripheral surface of said slide bearing, which is in slide contact with said fulcrum shaft, is formed so as to have a surface roughness RA of not more than 6.3 &mgr;m.

Abstract: The invention relates to a transmission for a self-propelled engine of the type comprising an endless transmission (1) with a belt (2) between a driving pulley (3) and a driven pulley (4) carried by the input shaft (5) of a clutch engaging mechanism (7) whose output shaft (6) is coupled to the wheels (20) of the machine.

Abstract: A tensioner, includes a hollow plunger guided in a cylinder for displacement in an axial direction and spring-loaded in a direction of a power transmitting element. A pressure chamber for receiving hydraulic fluid is defined by the cylinder and the plunger. Fitted interiorly of and being immobile with respect to the plunger is a control member which has a closed outer circumference, with a ring-shaped leakage gap formed by the plunger and the control member for passage of hydraulic fluid from the pressure chamber. The control member and the plunger have different coefficient of thermal expansion so that the leakage gap has dimensions which decrease as a temperature of the hydraulic fluid increases.

Abstract: A ratchet tensioner has a plunger retractably mounted in a housing and urged by a spring in a direction to project outward from the housing, and a ratchet pawl pivotally mounted on the housing and having a first prong normally engaged with one of ratchet teeth formed on the plunger so as to prevent backward motion of the plunger. The ratchet pawl also has a second prong spaced a predetermined distance from the first prong in the backward direction of the plunger and engageable with a second rack tooth to release meshing engagement between the first prong and the rack tooth when the plunger is moved forward due to a slack of a timing chain used with the tensioner. In order to maintain a predetermined amount of backlash between the first prong and the rack teeth, the rack teeth have a height greater than a half pitch of the ratchet teeth.

Abstract: A tensioning mechanism is provided for minimizing tension variations in a moveable endless belt having a desired tension setting and includes a moveable member for mounting transversely to a direction of movement of the moveable endless belt and into contact with the moveable endless belt; a first assembly including a first rotatable arm having a first end connected to the moveable member, and a second end coupled to a first pivot; and a second assembly including a tensioning force applying roller, and a second rotatable arm having a first end connected to the moveable member and a second end coupled to a second pivot.

Abstract: A ratchet tensioner includes a mechanism for selectively locking and releasing a plunger with respect to a ratchet pawl. The plunger locking and releasing mechanism has an actuator plate secured to the shaft of a ratchet pawl body for co-rotation therewith above the outside surface of a housing shaft in which a pin-accommodating hole is formed. The actuator plate has a pin-insertion hole smaller in diameter than the pin-accommodating hole and is manually movable about the axis of the shaft in opposite directions between a locking position in which the pin-insertion hole is in substantial alignment with the pin-accommodating hole and the engagement between a ratchet pawl and ratchet teeth on the plunger is maintained, and a releasing position in which the pin-insertion hole is out of alignment with the pin-accommodating hole, and the ratchet pawl is released from interlocking engagement with the ratchet teeth against the force of a ratchet pawl spring.

Abstract: A ratchet tensioner includes a plunger locking and releasing mechanism for selectively locking and releasing a plunger relatively to a ratchet pawl pivotally mounted to a housing. The plunger locking and releasing mechanism has a lever-like pin contact portion formed integrally with a ratchet pawl body, a pin member-fitting hole formed in two opposed side walls of the housing in registry with the lever-like pin contact portion such that there being two pin-accommodating spaces defined between the lever-like pin contact portion and an inner peripheral surface of the pin member-fitting hole on opposite sides of the lever-like pin contact portion, and a pin member removably and selectively inserted in the pin-accommodating spaces.

Abstract: An automotive tension device features a pair of pulleys which are pivotally mounted on the same pivot arm. The pulleys are positioned within the drive system (e.g., a belt drive system) in such a manner that the moments relative to the pivot axis created by the force resultant of the driving member passing around each of the pulleys are oppositely directed. Thus, the pulleys provide rotational support for each other. The tension device and arrangement is positioned within a belt drive system having a combination starter/generator, wherein the crankshaft ordinarily drives the belt but the starter/generator drives the belt on engine startup (an arrangement which creates varying kinematic conditions within the belt).

Abstract: A distributor apparatus is disclosed for spreading materials. The apparatus includes a container having a first and a second end and a first and a second side, the ends and the sides defining therebetween an opening for the reception therein of the materials. The container defines an outlet for the distributing therethrough of the materials. A distributing device is disposed in the vicinity of the outlet, the distributing device being pivotally secured to the container about a pivotal axis. The distributing device further includes a frame, a driven device rotatably secured to the frame for ejecting the materials from the container, a driving device for rotating the driven device such that the materials are moved from the container through the outlet by the driven device so that spreading of the materials from the container is permitted, a drive for driving the driving device and a guide for guiding the driving device between the driven device and the drive.

Abstract: The housing of a ratchet tensioner is formed of an aluminum-containing metallic material in order to decrease the weight of the tensioner. A hard alumite layer having a thickness of 5 to 50 &mgr;m is formed on the inner circumferential surface of a plunger accommodation bore formed in the housing, and a lubricant is incorporated into the alumite layer. Thus, the service life before occurrence of seizure is increased.

Abstract: A belt tensioner includes a stationary housing extending along a pivot shaft an lever arm mounted coaxially with the housing on the pivot shaft and formed with a free end which receives a pulley assembly juxtaposed with a belt to be tensioned. The arm is formed with a compartment receiving a damping assembly which slows down displacement of the lever arm and the pulley assembly upon pivoting the lever arm away from the belt.

Abstract: A belt tensioner includes a stationary bracket mounted at the front of an engine and a pivotal arm operatively connected to the bracket and forming a plurality of channels with respective supporting surfaces of the bracket. The channels receive a plurality of bushings so as to increase an overall supporting surface of the belt-tensioner.

Abstract: A belt tensioner includes a stationary spring case receiving a pivotal arm supporting a pulley and biased in a belt-tensioning direction by a spring element. The arm is provided with a surface supporting an armplate bushing having an inner diameter and juxtaposed with an armplate. The armplate has an inner diameter smaller than an inner diameter of the armplate bushing so as, upon radially riveting the armplate to a stationary shaft during assembly of the tensioner, an inner area of the armplate is resiliently bent. The bushing is provided with a taper, so that the respective juxtaposed surfaces of the bushing and armplate extend complimentary to each other upon deflection of the armplate.

Abstract: A hydraulic tensioner having a hydraulically actuated rack member. A pair of check valves permit fluid to flow from an external source of pressurized fluid into a fluid chamber. The two check valves form a substantially fluid tight chamber in order to provide sufficient pressure to prevent the piston from retracting upon deenergization of the source of pressurized fluid.

Abstract: The drive-chain tensioner is automatically self-adjusting. A chain-slipper is guided to follow wear-movement of the chain. A cam is mounted on the follower. If slack in the chain increases, the cam is rotated by a cam spring to a position in which a larger radius of the cam lies under the follower. The cam provides a solid abutment that prevents the chain from compressing the tensioning springs and becoming slack when drive is reversed. For compactness and good load distribution, the chain is supported on a saddle between two cams. The cams have ratchet teeth.

Abstract: A take-up device for automatically taking-up slack in a control cable. The take-up device includes a cable mount mounted to one end of a control cable. A compression spring engages the cable mount and continuously biases the cable mount to a slack take-up position to tension the control cable. In the preferred embodiment, the cable mount is biased so that one end of the control cable moves toward the other end of the control cable in order tension the control cable. A threaded tube engages the cable mount to retain the cable mount in the slack take-up position. The take-up device is characterized by a torsion spring automatically moving the threaded tube into engagement with the cable mount as the compression spring biases the cable mount to the slack take-up position thereby automatically preventing the cable mount from returning to a slackened position.

Abstract: A transmission apparatus includes a chain operatively engaged with a driver sprocket assembly and a driven sprocket assembly, a tensioner bracket including a roller engaged with the chain, a tensioner rod including a plurality of spaced apart flange portions engageable with a brace and a threaded portion extending through an opening formed in the tensioner bracket and screwably attached to a plate. An operator may unscrew the tensioner rod and pass at least one of the flange portions through a slot in the brace to slacken the chain. The operator may also position at least one flange portion in a narrow end of the slot, and screw the tensioner rod to press that flange against the brace to tighten the chain.

Abstract: Disclosed is a tensioner for use in an engine. The tensioner comprises a fixed structure that fixes to the engine. A movable structure is mounted for movement relative to the fixed structure in a belt tensioning and opposite directions. A pulley member has a belt engaging surface that engages with the belt. One of the fixed and movable structures has an interior surface defining a fluid chamber containing fluid and the other includes a chamber dividing structure. The chamber dividing structure defines first and second chamber portions on opposing sides thereof. A biasing element biases the movable structure in the tensioning direction to tension the belt. Relative movement of the movable structure in the tensioning direction displaces fluid from the first to the second chamber portion and increases fluid pressure in the first chamber portion and decreases fluid pressure in the second chamber portion, and the reverse occurs during movement of the movable structure in the opposite direction.

Abstract: A device for tensioning a traction mechanism, preferably a chain, which includes a traction wheel, preferably a sprocket (1), rotatably mounted on a hollow axle (3). Within the hollow axle (3), a hollow piston element (5, 6) is arranged, which is biased against the hollow axle (3) using a spring element, preferably a coil spring (12). The piston element (5, 6) is arranged in a piston chamber (4) such that the longitudinal axis of the piston element (5, 6) is arranged perpendicular to the traction wheel axis. In the inner space (7) of the piston element (6), motor oil is preferably provided for hydraulic damping of the piston element (6).

Abstract: The present invention relates to a fabric raising machine including positively controlled raising/grinding cylinders, which comprises a plurality of rotary working cylinders, circumferentially arranged on a rotary framework, and for each working cylinder, a toothed pulley, thereon are entrained a cylinder closed loop driving toothed belt and cylinder closed loop timing belt to synchronize the operations of the toothed pulleys with the teeth of the driving belt.

Abstract: A support body used in a tensioning device includes a support element and a bottom plate. The support element is attached to the bottom plate in a radially and axially form-fitting and fixed manner through use of a plastic element that is molded into place by extrusion. The plastic element engages a groove formed in the outer surface of the support element and also engages through holes formed in the bottom plate.

Abstract: A tensioner guide includes a stationary shoe (6) having a contact surface (6A) confronting a free span of a transmission chain (4) between a pair of sprockets (2, 3), a movable shoe (7) movable relatively to the stationary shoe (6) in a direction toward and away from the transmission chain free span, and an urging member (9) for urging the movable shoe (7) toward the transmission chain free span. The movable shoe (7) has a contact surface (7A) being pressed against and in slide contact with the transmission chain free span by the action of the urging member (9) to hold a tension in the transmission chain (4).

Abstract: A tensioning device is provided for drive belts, which is formed as a resilient, bendable ring. The ring is arranged to be inserted between lengths of the drive belt and may be positioned in a groove in one of the pulleys of the belt transmission of which the drive belt is an integral part. The ring is designed with such a large circumference that, during expansion, it is squeezed between the lengths of the drive belt, which causes the drive belt to be tensioned.

Abstract: A motor mounting apparatus supports a motor relative to a base for relative rotation about a pivot axis to control tension in an endless loop driving element. A driving element emcompasses a drive member driven by the motor about a drive member axis and a driven member coupled to a load and driven by the driving member about a driven member axis to transmit power from the motor to the load. The apparatus includes a threaded shaft rotatable by a user about a shaft axis. The shaft axis is fixed relative to a first of the base and motor. A rider is carried by the threaded shaft so that rotation of the threaded shaft about the shaft axis produces longitundinal translation of the rider along the shaft axis relative to such first one of the base and motor. A rigid link has a first end pivotally coupled to the rider and a second end pivotally coupled to a second one of the base and motor.

Abstract: A chain tensioning arrangement arranged in a timing case for an internal-combustion engine which acts upon a timing chain that can be driven by the crankshaft of the internal-combustion engine. The chain tensioning arrangement provides a simple device with respect to assembly and operational reliability. The chain tensioning arrangement includes a tensioning member which can be adjusted between a mounting position, releasing chain tension and a tensioning position acting upon the chain. In the mounting position, the tensioning member is clamped by a releasable locking pin which extends beyond the floor of the timing case of the internal-combustion engine.

Abstract: A hydraulic tensioner device, which is compact in size, simple in construction and can be manufactured efficiently, has a shoe (4) for applying a tensioning force to a chain (3) or belt. The shoe has a plunger (5) which has a hollow portion (6) in which a valve block (7), a spring (9) and an inner sleeve (10) are slidably disposed. The upper end of the inner sleeve is supported within a cylindrical chamber (2) in a tensioner body (1). The tensioner body has an oil passage (11) communicating with an internal space of the inner sleeve. The bottom surface (6A) of the hollow portion and the valve block jointly define therebetween a high pressure chamber (8) filled with an oil supplied from the internal space of the inner sleeve via a check valve (7A) in the valve block.