Abstract: An isolator for isolating a device driven by an engine via an endless drive member is described. The isolator comprises a shaft adapter that is connectable with a shaft of the device, defining a shaft adapter axis, a rotary drive member that is rotatable relative to the shaft adapter and has an endless drive member engagement surface that is engageable with the endless drive member, and an isolation spring arrangement positioned to transfer torque between the shaft adapter and the rotary drive member. The isolation spring arrangement has at least one isolation spring that is axially offset from the endless drive member engagement surface. The at least one isolation spring has an outer edge that is radially outside the endless drive member engagement surface.

Abstract: In an aspect, a tensioner is provided for tensioning a belt and includes first and second tensioner arms having first and second pulleys respectively. The first and second pulleys are configured for engagement with first and second belt spans, and are biased in first and second free arm directions respectively. A second tensioner arm stop is positioned to limit the movement of the second tensioner arm in a direction opposite the second free arm direction. The second tensioner arm stop is positioned such that, in use, the second pulley is engaged with the endless drive member while the second tensioner arm is engaged with the second tensioner arm stop throughout a first selected range of operating conditions.

Abstract: In an aspect, a power transfer device, such as a decoupler, is provided for transferring torque between a shaft and a belt. The device includes: a hub configured to 5 couple to the shaft, a pulley rotatably coupled to the hub that includes a power transmitting surface configured to engage the belt, an isolation spring to transfer a rotational load from one of the pulley and the hub to the other of the pulley and the hub, optionally a one-way clutch to permit overrunning of one of the pulley and the hub relative to the other of the pulley and the hub in a first direction, and a damping member 10 positioned to be driven into frictional engagement with a friction surface by a force from the isolation spring acting on the damping member that varies based on the rotational load transferred by the isolation spring.

Abstract: In an aspect, a decoupler is provided, and included a driver having a clutch surface a hub that is disposed within the driver, and at least one torsionally-compliant member and a wrap spring clutch that are disposed in series between the hub and the clutch surface. The driver comprises a pulley and a cover that is received into a cavity in the pulley. The pulley has a belt-engagement surface and is fixedly coupled to the cover for rotation therewith. The cover defines the clutch surface.

Abstract: In an aspect, the invention is directed to a clutched device (such as, for example, a decoupler) that includes a clutch input member, a clutch output member, a wrap spring clutch. The wrap spring clutch has an overrun locking member thereon that is engageable with an overrun locking aperture in the output member so as to maintain a face at the helical end of the wrap spring clutch in engagement with a output member clutch drive face on the clutch output member.

Abstract: In one aspect, a decoupler comprises an input member, an output member, and a torsional isolation spring, a carrier, and a wrap spring clutch configured to operate in a first mode in which rotary power is transmitted in a first rotational direction from the input member to the output member serially through the wrap spring clutch, the carrier, and the isolation spring, and a second mode in which the output member overruns the input member in the first rotational direction. The carrier has a carrier clutch drive face that receives a first vector force from an end of the wrap spring clutch, and an isolation spring drive face that receives a second vector force from an end of the isolation spring. The wrap spring clutch and isolation spring drive faces are arranged so as to direct the second vector force to intersect with the first vector force substantially at the carrier clutch drive face.

Abstract: A decoupler having an input member, an output member and a combination one-way clutch and torsional isolator that couples the input and output members. The combination one-way clutch and torsional isolator includes a single helical coil spring. The decoupler being designed to provide torsional damping through a range of torque transmitted through the decoupler, the range including a maximum rate torque for the decoupler.

Abstract: In the one aspect, a tensioner that incorporates a fluid actuated cylinder and that is capable of precognitively anticipating when 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: A decoupler having an input member, an output member and a combination one-way clutch and torsional isolator that couples the input and output members. The combination one-way clutch and torsional isolator includes a single helical coil spring. The decoupler being designed to provide torsional damping through a range of torque transmitted through the decoupler, the range including a maximum rated torque for the decoupler.

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: A clutched device that includes a driving member, a driven member and a clutch assembly that is disposed between the driving and driven members. The clutch assembly includes a carrier, a wrap spring and a spacer. The carrier is configured to coupled the wrap spring to one of the driving and driven members to permit the transmission of rotary power there between. The spacer is configured to limit elongation of the wrap spring in an axial direction.

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: In an aspect, the invention is directed to a clutched device (such as, for example, a decoupler) that includes a clutch input member, a clutch output member, a wrap spring clutch. The wrap spring clutch has an overrun locking member thereon that is engageable with an overrun locking aperture in the output member so as to maintain a face at the helical end of the wrap spring clutch in engagement with a output member clutch drive face on the clutch output member.

Abstract: In an aspect, a decoupler is provided, and included a driver having a clutch surface a hub that is disposed within the driver, and at least one torsionally-compliant member and a wrap spring clutch that are disposed in series between the hub and the clutch surface. The driver comprises a pulley and a cover that is received into a cavity in the pulley. The pulley has a belt-engagement surface and is fixedly coupled to the cover for rotation therewith. The cover defines the clutch surface.

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: An engine starter apparatus having a clutch assembly and a ring gear or pulley. The clutch assembly has a plate structure, a drive hub and a clutch element for selectively coupling the drive hub to the plate structure. The ring gear or pulley is coupled to the plate structure.

Abstract: In one aspect, a decoupler comprises an input member, an output member, and a torsional isolation spring, a carrier, and a wrap spring clutch configured to operate in a first mode in which rotary power is transmitted in a first rotational direction from the input member to the output member serially through the wrap spring clutch, the carrier, and the isolation spring, and a second mode in which the output member overruns the input member in the first rotational direction. The carrier has a carrier clutch drive face that receives a first vector force from an end of the wrap spring clutch, and an isolation spring drive face that receives a second vector force from an end of the isolation spring. The wrap spring clutch and isolation spring drive faces are arranged so as to direct the second vector force to intersect with the first vector force substantially at the carrier clutch drive face.

Abstract: An engine starter that employs a clutch between a flywheel or flex plate and a plate structure that is configured to receive rotary power from a starter motor through a transmission. The transmission may include ring and pinion gears or a belt that transmits rotary power between pulleys.

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: A method for producing an over-running decoupler that is configured to transmit rotary power between a rotary member and a hub. The over-running decoupler includes a one-way clutch having a clutch spring, a carrier that is coupled to the clutch spring and at least one spring that resiliently couples the carrier to the hub. The method includes: establishing a desired fatigue life of the at least one spring; establishing a design deflection of the at least one spring during resonance, wherein deflection of the at least one spring at the design deflection during resonance does not reduce a fatigue life of the at least one spring below the desired fatigue life; and preventing resonance in the over-running decoupler by controlling a maximum deflection of the at least one spring such that the maximum deflection is less than or equal to the design deflection.