Abstract: A dual ratcheting tool having multiple ratchet assemblies and handles for rotating adapters, sockets, and other tools is provided. The dual ratcheting tool includes an upper ratchet assembly independently rotationally and mechanically connected to a lower ratchet assembly; a drive member connected to the upper ratchet assembly and the lower ratchet assembly; an upper handle connected to the upper ratchet assembly, the upper handle having an upper directional switch to set a drive direction of the upper ratchet assembly; and a lower handle connected to the lower ratchet assembly, the lower handle having a lower directional switch to set a drive direction of the lower ratchet assembly. The upper and lower handles of the dual ratcheting tool can independently and in combination can drive a socket more quickly and efficiently than ratchets having a single ratchet assembly and handle.

Abstract: A reversible ratchet tool includes a cage-type reversing mechanism including a cage member for shifting rollers from their first positions to their second positions. The structure and configuration of the cage member is improved with resilient members for preventing the rollers being stuck unintentionally when the rollers are positioned either in the corresponding first positions or the corresponding second positions, while being capable of maintaining and restricting the rollers upright in place when the rollers are shifted from the corresponding first positions to the corresponding second positions.

Abstract: A wrench has a roller motion transmission mechanism that changes reciprocating motion of a driving member to unidirectional rotational motion of a driven member. The wrench has a head with a cylindrical inside wall surrounding a body with a plurality of ramps inclined toward the cylindrical inside wall. A wedging member comprising a cylindrical roller engages each ramp and the cylindrical inside wall of the head. A cage anchored to the body retains the wedging members in contiguous locations relative to the ramps and the cylindrical inside wall of the head. Retainers connected to the cage bias all of the wedging members into engagement with the ramps and the cylindrical inside wall of the head.

Abstract: A torque transfer device includes a handle, a roller cage bias ring, a plurality of rollers and a spindle. The handle includes a scalloped outer race. The roller cage bias ring is located within the scalloped outer race. The roller cage bias ring includes a base ring and a plurality of pillars extending out of the base ring. The rollers are positioned between the pillars. The spindle includes a circular inner race.

Abstract: A power transmission device includes a first power transmission path that is provided between an engine and a driving wheel, and a second power transmission path that is provided between the engine and the driving wheel and that is provided in parallel with the first power transmission path. The first power transmission path includes a first clutch and a secondary clutch that is arranged on the driving wheel side with respect to the first clutch. The second power transmission path includes a continuously variable transmission and a second clutch. The secondary clutch is configured to make a changeover between a first mode and a second mode.

Abstract: In at least some implementations, a multiple position actuator, includes a motor, a gearset driven by the motor, an output driven by the gearset between at least two positions, and a clutch arranged between the gearset and the output to permit relative rotation between the output and gearset. The gearset, output and clutch may be coaxially arranged. The clutch may include at least two movable elements that move relative to one or both of the output and gearset to permit relative rotation between the clutch and gearset in two opposed rotational directions. In at least some implementations, the gearset provides a torque to the output that is at least 50 times greater than the torque of the motor.

Abstract: A wrench has a roller motion transmission mechanism that changes reciprocating motion of a driving member to unidirectional rotational motion of a driven member. The wrench as a head with an inside cylindrical wall surrounding a body with a plurality of protrusions. Each protrusion has a ramp inclined toward the cylindrical wall. A wedging member comprising a cylindrical roller engages each ramp and inside cylindrical wall of the head. A cage anchored to the protrusions retains the wedging members in engagement with the ramps and the inside cylindrical wall of the head.

Abstract: A power transmission assembly includes an input member adapted to receive drive torque from a source of torque, an output member adapted to provide drive torque to an output device and a bi-directional roller clutch including a first ring fixed for rotation with one of the input and output members. A second ring is spaced apart from the other of the input and output members. Rollers are positioned in aligned cam tracks formed in facing surfaces of the first and second rings. Neither the first ring nor the second ring support the input member or the output member on the other. The second ring may circumferentially index relative to the first ring for causing the rollers to ride up the cam tracks and force the second ring to frictionally engage the other of the input and output members, thereby establishing a drive connection between the input and output members.

Abstract: Systems and methods for reducing perception of transitions from shifting a transmission from neutral to drive are described. In one example, the transmission is shifted from neutral to drive in response to brake pedal motion before the brake pedal is fully released so that timing of pressurizing clutches and engaging a forward gear is advanced to occur while the brake pedal is still applied.

Abstract: A locking device has a collar body, a roller cage, multiple rollers, and a clamping set. The collar body has a chamber formed inside the collar body and multiple concave recesses formed in an inner periphery of the collar body. The roller cage is mounted in the chamber. The clamping set has multiple clamping blocks annularly disposed within the roller cage. Each one of the multiple clamping blocks is curved and has multiple second concave recesses formed in an outer peripheral surface of the clamping block. The multiple rollers are rotatably mounted to the roller cage and are respectively received by the multiple first concave recesses and the multiple second concave recesses. Each one of the multiple rollers is rotatable along a corresponding one of the multiple first concave recesses and a corresponding one of the multiple second concave recesses.

Abstract: The present invention relates to a freewheel comprising an outer ring, an inner ring, and at least one clamping element which is between the outer ring and the inner ring, which is moveable from a clamping position into a release position along a race on the outer ring in a first circumferential direction relative to the outer ring, wherein the race has a clamping section, and a release section following the clamping section in the first circumferential direction on which the clamping element is supportable. A first tangent through at least one support point on the clamping section defines a first inner angle, which is greater than 180°, with a second tangent through at least one support point on the release section. In addition, the present invention relates to a freewheel arrangement for a motor vehicle comprising such a freewheel.

Abstract: A socket wrench includes a ratcheting end including a circular opening, a crescent recess disposed on one surface, the crescent recess being adjacent to the circular opening and communicating therewith, the crescent recess having a through hole open to the other surface, and two opposite cavities at both ends of the crescent recess respectively; a cylindrical socket disposed in the circular opening; a crescent cover including two opposite projections on an outer surface, a circular hole in an intermediate portion, and two grooves adjacent to the projections respectively, the crescent cover being disposed on the crescent recess with the projections positioned in the cavities respectively; a pivotal pawl having a threaded hole, the pivotal pawl being disposed through the circular hole to align with the through hole; and a threaded fastener driven through the through hole into the threaded hole to pivotably fasten the pivotal pawl.

Abstract: A transmission controller increases hydraulic pressure supplied to a secondary pulley and decreases hydraulic pressure supplied to a primary pulley to shift a variator to a mechanical Low speed ratio when the hydraulic pressure supplied to the primary pulley and the secondary pulley vibrates. The transmission controller shifts the variator from the mechanical Low speed ratio to a High side when a sub-transmission mechanism is downshifted during controlling a speed ratio of the variator at the mechanical Low speed ratio.

Abstract: In a power-transmitting mechanism with rolling-element bearing according to the present invention, an inner ring has plural inner ring members disposed in series in an axial direction, an outer ring has plural outer ring members respectively cooperating with the plural inner ring members. Plural rolling elements are disposed between the cooperating inner ring members and outer ring members. A retainer has plural partitions retaining the plural rolling elements at predetermined intervals in the circumferential direction such that rolling elements disposed between one pair of cooperating inner ring and outer ring members and rolling elements disposed between another pair of cooperating inner ring and outer ring members orbit the corresponding inner ring members in a synchronized manner, and a connector connecting the plural partitions such that the plural partitions integrally rotate around an axis.

Abstract: An actuator of an electric parking brake system includes a motor, an output member, and a transmission device. The transmission device includes a housing, a self-locking unit and a transmission unit. The self-locking unit includes a fixed sleeve, and a driving member, a driven member and a lock holder that are rotatable with respect to the sleeve. The lock holder supports lock elements arranged to prevent the driven member from turning unless it is driven by the driving member. A planetary gear unit may be provided as part of the transmission device.

Abstract: A step-by-step mechanism with a housing (2) in which an outer ring (3) and an output element (4) are disposed, the outer ring (3) including double-clamp ramps (6) and the output element (4) including an inner clamping track (7), and, in an annular space (8) formed between the outer ring (3) and the output element (4), clamping bodies (9) being disposed which cooperate with the double-clamp ramps (6), the clamping bodies (8) being spring-loaded. Provided in the housing (2) is a housing-fixed sleeve (10) and spring elements (13) that spring-load the clamping bodies (9) are supported on the sleeve (10).

Abstract: This application relates generally to a reversible force or torque transfer device. This device may be used in many different applications. The example used for the illustrative purposes of this patent is a wrench. The present invention devises a reverse mechanism that can resist any amount (up to the shear strength of the material) of randomly generated forces that may cause this effect.

Abstract: This application relates generally to a reversible force or torque transfer device. This device may be used in many different applications. The example used for the illustrative purposes of this patent is a wrench. The present invention devises a reverse mechanism that can resist any amount (up to the shear strength of the material) of randomly generated forces that may cause this effect.

Abstract: A torque limiting instrument can is configured to drive a shaft to rotate in a select direction in response to an applied torque until the applied torque reaches a predetermined threshold.

Abstract: A roller clutch including an outer race, an inner race, a first engagement member situated between the outer race and the inner race, and a second engagement member situated between the outer race and the inner race. The first engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race only in response to the inner race turning in a positive direction and applying negative torque to the first engagement member. The second engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the inner race applying positive torque to the second engagement member while the outer race applies negative torque to the second engagement member.

Abstract: A clutch control device for a work vehicle includes a determination unit that determines as to whether or not a clutch cutoff condition has been established based upon whether or not the accelerator pedal is being operated, as determined by the accelerator pedal operation determination unit, the vehicle speed of the work vehicle detected by the vehicle speed detection unit and the braking force of the work vehicle detected by the braking force detection unit; and a clutch control unit that controls engagement/release of a clutch so as to release the clutch when the determination unit determines that the clutch cutoff condition has been established.

Abstract: A roller clutch mechanism of a reversible ratchet tool is configured to include a biasing and reversing mechanism for biasing rollers in the roller clutch mechanism. A cage member of the roller clutch mechanism locates rollers in either a clockwise or counterclockwise position based on a selective position of the reverser mechanism. The reverser mechanism applies a constant bias to the cage member so that the rollers are constantly biased and quickly engage between the ratchet body and the drive head. The constant bias applied to the cage member reduces the ratcheting angle for improved performance of the reversible ratchet tool.

Abstract: A roller clutch includes an outer race, an inner race, a first engagement member situated between the outer race and the inner race, a second engagement member situated between the outer race and the inner race, and an electromagnetic mover to be energized or de-energized. The first engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the electromagnetic mover being energized and the inner race applying negative torque to the second engagement member while the outer race applies positive torque to the second engagement member. The second engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the inner race applying positive torque to the second engagement member while the outer race applies negative torque to the second engagement member.

Abstract: An elevator may include an elevator car, a set of hoisting ropes, a hoisting machine, a traction sheave, and a brake. The elevator car may be suspended on the hoisting ropes. The hoisting machine may drive the traction sheave to move the elevator car using the hoisting ropes. The brake may include a brake wheel and brake shoes. The brake may exert an effect on rotation of the traction sheave. During braking, the effect of the brake on the rotation of the traction sheave may depend on a direction of rotation of the traction sheave. The effect of the brake on the rotation of the traction sheave may be greater when the direction of rotation of the traction sheave during braking corresponds to the elevator car moving downward than when the direction of rotation of the traction sheave during braking corresponds to the elevator car moving upward.

Abstract: An anti back-drive coupling (5) comprises an input (20) driveable about an axis A in a clockwise and anticlockwise direction in torque transmitting communication, via a mechanism, with an output (40) driveable about the axis by the input in either of the rotational directions, the mechanism including: a tube (29), driveable by the input, carrying two cages (21) and (23) spaced along the axis A, each cage housing rollers (26) and (28) respectively; an output member 48 for driving the output (40), including two flattened formations (42) and (44) adjacent each cage in use, for engagement with the rollers (26) and (28) respectively; and a back-torque reaction freewheels (30) and (32) engageable with the rollers, for reacting back-torque transmitted through said output member (48) and into the rollers.

Abstract: This application relates generally to a reversible force or torque transfer device. This device may be used in many different applications. The example used for the illustrative purposes of this patent is a wrench. The present invention devises a reverse mechanism that can resist any amount (up to the shear strength of the material) of randomly generated forces that may cause this effect.

Abstract: A rotation transmission device is configured such that when an electromagnet of an electromagnetic clutch is energized, a control retainer of a two-way clutch is moved in the axial direction, so that the control retainer and a rotary retainer rotate relative to each other in the direction in which the circumferential widths of pockets decrease, thereby disengaging pairs of rollers from an outer ring and an inner ring. A spring holder is provided which is fixed to an input shaft and kept in abutment with an axial end surface of the inner ring to prevent relative rotation between the control retainer and the rotary retainer in the direction in which the circumferential widths of the pockets decrease, from the neutral position of the rollers. The spring holder is prevented from axial movement to prevent untimely engagement of the two-way clutch. The inner ring is integral with the input shaft.

Abstract: A compelling-type radial clutch device includes a V-shaped bendable joint structure installed between an active rotary part and a passive rotary part and driven by the active rotary part The V-shaped joint structure includes a joint axial core connecting an active arm of V-shaped joint structure and a compelling arm of the V-shaped joint structure, and an outward-expanding spring installed between the two arms, so that a prestressed outward-expanding bias force between the two arms causes angular displacement of the compelling arm by causing the angle between the two arms to increase, one end of the active arm of the V-shaped joint structure being connected and fastened on the active rotary part; and the other end of the compelling arm of the V-shaped joint structure being installed with a compression head or roller arranged to engage an inner notch in the passive rotary part.

Abstract: A ratchet pulley includes a housing, a hub, an annular pulley and a selection device. The housing has two openings for a rope to go into and go out of the housing. The hub is received in the housing and reciprocally movable between an upper position and a lower position. The annular pulley is received in the housing and rotatable on the circumference of the hub. The rope is wound over the annular pulley. The selection device is disposed in the internal space of the hub and has a rotatable rod exposed to outer side for selecting whether the rotational direction of the annular pulley is limited or not limited or is limited when the rope is pulled and the annular pulley is loaded.

Abstract: An apparatus for adjusting the height of a vehicle seat. The apparatus includes an input shaft for inputting a torque by using a lever installed at one side of the seat; an output member connected to a link means to output the torque for adjusting the height of the seat; a clutch drum interposed between the input shaft and the output member on a torque transfer path; a torque transfer unit comprising a plurality of neighboring engagers wherein the engagers disposed at two ends of the torque transfer unit are spaced apart from each other, and wedge-combined between the input shaft and the clutch drum to transfer the torque; and an elastic member for providing an elastic restoration force for moving the torque transfer unit to its initial position. According to the present invention, since a conventional retainer may be omitted, backlash caused by a retaining clearance and an operation clearance may be prevented and thus an operational efficiency may be increased.

Abstract: An actuator for operating a multi-mode overrunning multi-directional clutch includes an axially displaceable shaft portion, an engagement member connected to the shaft portion and having a resilient segment for displacing a piston to engage the clutch. A locking portion is connected to the shaft portion for displacing an actuator pin to lock the clutch. In an example embodiment, the clutch is a three-mode overrunning bi-directional clutch. In some example embodiments, the resilient segment is radially flexible. In some example embodiments, the engagement member includes a tubular section with a plurality of circumferentially-offset axial slots, and the resilient segment is circumferentially disposed between corresponding axial slots.

Abstract: A differentially controllable two-way clutch including an outer wheel with a cam portion on an inner circumference, an inner wheel arranged apart from the outer wheel and toward an inner diameter of the two-way clutch as well as rotatably and concentrically with respect to the outer wheel, a torque transmission member located between the outer wheel and the inner wheel to transmit torque, a cage configured to hold the torque transmission member and to be slidable in a circumferential direction and which is differentially controlled, and a spring supported by the cage and configured to be capable of biasing the torque transmission member so that the torque transmission member engages with a cam surface.

Abstract: Apparatus for an anti-rotation mechanism, such as used in a wrench. The space between a pair of races contains a plurality of pairs of rollers. One race has a protrusion centered inside each pair of rollers, with the rollers biased against the protrusion. Adjacent the protrusion and between the rollers of each pair is a prong that selectively biases one or the other of the rollers of the pair away from the protrusion. When one roller in the pair of rollers is biased away from the corresponding protrusion, relative motion between the pair of races is enabled in only one direction. The protrusions extend into the space between the pair of races sufficiently to prevent the rollers from moving under load when relative motion is inhibited.

Abstract: A switchable free-wheel device for a transmission for a crank-driven CVT of a motor vehicle. The device includes at least one free-wheel unit with a drivable outer ring, an inner ring in the form of an output shaft, and clamping bodies disposed between the rings and rotatable about their longitudinal axes. In the axial direction, each of the clamping bodies includes first and second grooves that are axially spaced from each other and offset relative to each other in the peripheral direction of the clamping body. Annular worm springs surrounding the clamping bodies are displaceable in the axial direction of the body by a switching mechanism, such that the springs engage either in the first groove or in the second groove. The clamping body rotates about its longitudinal axis such that the force applied by the worm spring runs on a side of the longitudinal axis.

Abstract: A roller clutch includes an outer race, an inner race, a first engagement member situated between the outer race and the inner race, a second engagement member situated between the outer race and the inner race, and an electromagnetic mover to be energized or de-energized. The first engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the electromagnetic mover being energized and the inner race applying negative torque to the second engagement member while the outer race applies positive torque to the second engagement member. The second engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the inner race applying positive torque to the second engagement member while the outer race applies negative torque to the second engagement member.

Abstract: An anti back-drive coupling (5) comprises an input (20) driveable about an axis A in a clockwise and anticlock-wise direction in torque transmitting communication, via a mechanism, with an output (40) driveable about the axis by the input in either of the rotational directions, the mechanism including: a tube (29), driveable by the input, carrying two cages (21) and (23) spaced along the axis A, each cage housing rollers (26) and (28) respectively; an output member 48 for driving the output (40), including two flattened formations (42) and (44) adjacent each cage in use, for engagement with the rollers (26) and (28) respectively; and a back-torque reaction freewheels (30) and (32) engageable with the rollers, for reacting back-torque transmitted through said output member (48) and into the rollers.

Abstract: A bi-directional overrunning clutch includes a housing and a pair of hubs substantially coaxially aligned within the housing. A pair of roll cages position a plurality of rollers between each hub and an inner cam surface of the housing. The rollers are positioned to wedge between the hub and the inner cam surface when one of the hub and the housing is rotated with respect to the other. End caps are attached to the housing adjacent to the hubs. A friction disk mechanism includes a friction plate rotating in combination with each the roll cage and a spring compressed between the end cap and the roll cage for biasing the friction member into frictional contact with the hub. An intermittent coupler is located between each roll cage and configured to engage the roll cages so as to permit indexing of one roll cage relative to the other.

Abstract: A clutch includes a drive body disposed in a hollow base and having a plurality of force-bearing surfaces each cooperating with the hollow base to define an accommodating space therebetween. A clutching component is received in the accommodating space, and abuts against the hollow base and the force-bearing surface at first and second contact points, respectively. An angle between two lines, passing respectively through the first and second contact points and intersecting at a center of the clutching component, is greater than 160° and smaller than 180°. A ratio of a maximum distance between the inner annular surface and the force-bearing surface to a cross-sectional dimension of the clutching component is greater than 1 and smaller than 1.1.

Abstract: A quick-turn wrench includes a driving head with an axle hole. One side of the axle hole has a claw. A ratchet ring is accommodated in the axle hole. One end of the ratchet ring extends outside the axle hole and connects to a wrench handle. The ratchet ring is surrounded by a ratchet part that correspondingly engages the claw. A transmission rod is inserted into the ratchet ring, with one end having a transmission part. A bottom plate is disposed at the bottom of the axle hole. The end surface of the bottom plate facing the axle hole has a sliding groove. A pushing element is disposed in the sliding groove corresponding to the claw. The transmission part of the transmission rod connects to the pushing element. As the transmission rod rotates, the pushing element is driven to push the claw to release the fixing state between the claw and the ratchet ring.

Abstract: A clamping mechanism having two or more jaws which may be opened to allow a tubular to be introduced within the jaws and closed to retain the tubular therewithin. The rollers are located within concave recesses and maintained in spaced apart relationship by biasing means, whereby rotation of tubular may cause the rollers to be wedged between a wall of the recess and the tubular to grip the tubular within the jaws. The clamping mechanism may be utilized as an oil field tubular clamp, a slip, a pipe clamp, and other mechanisms. There is also disclosed a clutch comprising an outer race, a cage, and an inner ring. Recesses are provided in an outer race and accommodate rollers therewith and maintained in spaced apart relationship by the cage. The cage may be moved by an actuator to selectively allow free wheeling or prevent rotation. A socket ratchet incorporating such a clutch is also disclosed.

Abstract: Provided is a seat where pumping operation of a lever of the seat not only rotates an output member by inching but also, when a load in the operation direction of the lever is applied to the output side member, rotates it at one stroke in that direction. A seat adjustment device of the seat has a clutch unit (X) provided between the lever and a rotation member of a movement mechanism.

Abstract: The over-running bi-directional clutch is used to synchronize gears in a transmission to allow for locking and unlocking the gears in an efficient manner.

Abstract: A switchable free-wheel device for a transmission for a crank-driven CVT of a motor vehicle. The device includes at least one free-wheel unit with a drivable outer ring, an inner ring in the form of an output shaft, and clamping bodies disposed between the rings and rotatable about their longitudinal axes. In the axial direction, each of the clamping bodies includes first and second grooves that are axially spaced from each other and offset relative to each other in the peripheral direction of the clamping body. Annular worm springs surrounding the clamping bodies are displaceable in the axial direction of the body by a switching mechanism, such that the springs engage either in the first groove or in the second groove. The clamping body rotates about its longitudinal axis such that the force applied by the worm spring runs on a side of the longitudinal axis.

Abstract: The overrunning bi-directional clutch with controlled locking provides an actuator pin with either a reduced profile or an enlarged profile that is moved in a controlled manner so as to provide an extended period of time between the freewheel mode and the lock mode for the clutch.

Abstract: A rotation transmission device which can quickly change the direction of rotation includes an inner ring having cam surfaces on its outer periphery, an outer ring having a cylindrical surface on its inner periphery, and pairs of circumferentially opposed rollers, the rollers of each pair being disposed between one of the cam surfaces and the cylindrical surface to be circumferentially opposed to each other. A roller separation spring is disposed between the rollers of each pair of rollers to bias the rollers away from each other so that the rollers are wedged between the cam surface and the cylindrical surface. The rollers are retained by a roller retainer which can change the distance between the rollers of each pair of rollers. By reducing the distance between the rollers of each pair of rollers with the roller retainer, the rollers can be disengaged from the cam surfaces and the cylindrical surface.

Abstract: A reverse input prevention clutch bearing assembly comprises a first rotational member and a second rotational member which are arranged on a coaxial line and has orbit surfaces with different radii and a plurality of rolling members between the two orbit surfaces. The assembly also has a cage which supports the rolling members, and a distinguished wedge ring assembly which allows or does not allow the rolling members to rotate based on the change of the rotational direction gap between the first rotational member and the control member and the rotational direction of the control member.

Abstract: A flagpole winch that fits inside the internal hollow space a flagpole and is configured to alternatively wind or unwind a cord spool or to lock the cord spool into a rotational position. The winch uses a release spindle that unlocks an actuator mechanism when turned in either direction, allowing the cord spool to be positively rotated in either direction. Once the positive input or turning ceases, the continuous tension on the cord causes the actuator mechanism to automatically lock to arrest the cord spool.

Abstract: Example aspects of the present invention comprise two concentric rings, the rings movable relative to each other and defining a clearance between them for receiving at least one ball. The first ring is a coupling member, the second ring is a tubular slipper with a friction surface on the far side of the clearance, and the ball contacts the coupling member to the tubular slipper. At least one ring has a first recess with side walls for receiving the least one ball, and the friction surface is configured to displace in a radial direction when the at least one ball is axially aligned with the first recess and forced to run up the side walls by rotating the rings relative to one another. In an example embodiment of the invention, the first recess is a calotte.

Abstract: A clutch (22) includes a first member (48) rotatable with respect to a base member (14) in a first direction A and a second direction B, a second member (56) rotatable with respect to the base member, a rolling element (62) between the first and second members, and a ramp sleeve (58) disposed between the first and second members, and coupled to the base member such that the ramp sleeve is generally prevented from rotating with respect to the base member. The ramp sleeve includes a ramp (82). The second member includes a first rotational position with respect to the ramp sleeve and a second rotational position with respect to the ramp sleeve. The rolling element is configured to wedge against the ramp to prevent relative rotation of the first member with respect to the base member in the first direction when the second member is in the first rotational position.

Abstract: A one-way clutch unit includes a one-way clutch 2 and an unlocking member 3. The one-way clutch includes inner and outer races 6 and 7. Two pockets 8 having wedge spaces having a wedge angle ? are formed between the inner and outer races. Several rolling elements 15 are received in each pocket 8. The unlocking member 3 includes an annular portion concentric with the inner race 6, and axially extending unlocking pieces 18 each received in one of the pockets 8 between the end of the pocket 8 that faces the narrow ends of the wedge spaces having the wedge angle ? and the rolling elements 15. By externally actuating the unlocking member 3, the rolling elements 15 are moved toward the wide ends of the respective wedge space having the wedge angle ?, thereby unlocking the clutch. Thus, it is possible to unlock the clutch and prevent transmission of torque to the output member while the input member is rotating in the forward direction.