Described herein is a positioning spring configured to rotatably engage with a rotatable shaft. The rotatable shaft is configured to rotate relative to the positioning spring. The positioning spring comprises a first compliant lobe positioned at a first radial position. The first compliant lobe is configured to engage with one or more detent surfaces of the rotatable shaft to resist rotation of the rotatable shaft and to bias the rotatable shaft in one or more angular positions. The first compliant lobe is configured to flex upon engagement of the first compliant lobe with the rotatable shaft at a surface position out of contact with the detent surface.

A drive transmission device includes a clutch mechanism. The clutch mechanism includes a drive transmission member that is coupled to a first rotation member via a torque limiter and is arranged in a fitting part of a second rotation member and a third rotation member, and a transmission member moving part that includes a first gap and a second gap, the first gap being formed in the fitting part and having a width wider than the thickness of the drive transmission member and the second gap being formed in the fitting part and having a width that is equal to or smaller than the thickness of the drive transmission member, the transmission member moving part being formed in such a way that the width thereof becomes smaller about a rotation axis in the fitting part.

A compensating coupling comprises two outer coupling parts, namely an input-side coupling part and an output-side coupling part, both of which are to be connected to rotatable elements, more particularly shafts, and a center coupling part, which can be moved to a limited extent relative to the outer coupling parts. The center coupling part is composed of: a tube piece in the form of a damping element; and two tube end pieces, which are fastened to the tube piece and which are each designed to be fitted onto one of the outer coupling parts in a centered manner by ball head centering.

A tolerance ring is formed in an inner circumference of a clutch drum at a more forward position than a spline-fitted part in a forward direction during assembly of the clutch drum to a third sun gear; thus, the tolerance ring is located closer to an axial end of the clutch drum than to the spline-fitted part. Accordingly, it becomes easier to carry out grooving to form an annular groove for housing the tolerance ring therein in the inner circumference of the clutch drum, and thereby deterioration of machinability is suppressed.

A tolerance ring includes a ring body formed of a strip plate material having a spring property and formed in a ring shape. The tolerance also has a plurality of protrusions. The protrusions are formed on the ring body and radially protrude from the ring body. An abutment joint portion is formed between a first end and a second end of the ring body in the circumferential direction. The tolerance ring includes an insertion restricting portion configured to restrict an entering amount of another tolerance ring in the axial direction being inserted into the abutment joint portion from the side of the first edge of the ring body. The insertion restricting portion is located in an area between a first axial end of the plurality of the protrusions in the axial direction and the first edge, so as to restrict the entering amount of the other tolerance ring.

A tolerance ring for a torque transmission device is arranged in an annular space between an inner shaft member and an outer shaft member. The tolerance ring has a ring-shaped portion and a plurality of protrusions. The ring-shaped portion has a cylindrical shape and is brought into contact with one of the shaft members. The plurality of protrusions undergo elastic deformation and are arranged in a peripheral direction. The ring-shaped portion has seat portions formed between the protrusions that are adjacent to each other in the peripheral direction. The plurality of protrusions include selected protrusions that have the same shape and that are situated at the same axial position and unselected protrusions other than the selected protrusions. The selected protrusions and the unselected protrusions differ from each other in axial position of center point in a length direction.

The invention discloses a lower pair arc stop-block overrunning clutch comprising an outer rotating element, an inner rotating element, a friction block assembly, a wedge assembly, a first propeller assembly, a first elastic element and a synchronized push-block assembly, wherein a plurality of friction blocks of the friction block assembly are connected end to end and arranged between a first rotating ring and a second rotating ring; an drive element drives the first propeller assembly to press the synchronized push-block assembly to achieve synchronization of the friction block assembly; the first propeller assembly is stationary relative to the friction block assembly, the friction block assembly is pushed to rotate reversely with a driven element; the wedge assembly is wedged to generate a radial pressure on the friction block assembly so that the friction block assembly can achieve lower pair arc stop, thereby achieving the transfer of torque.

In one aspect, there is provided a decoupler for an accessory drive for an engine. The decoupler includes a decoupler input member and a decoupler output member. One of the decoupler input member and the decoupler output member has a clutch engagement surface. The decoupler further includes a wrap spring clutch and an isolation spring that act in series in a torque path between the decoupler input member and the decoupler output member. The wrap spring clutch has a radially inner surface and a radially outer surface. One of the radially inner and outer surfaces engages the clutch engagement surface in an interference fit with the clutch engagement surface. The decoupler further includes a volume of lubricant. During sufficiently high acceleration of the decoupler input member, there is slippage at the wrap spring clutch for a selected period of time after which the slippage stops.

A non-backdrivable clutched module for a bi-directional actuator such as actuators used for active aerodynamics on vehicles. The module has both a stopper mode and a clutch mode. During the stopper mode a back-driving force gets diverted away from the actuator using a locking bearing member. If the force is too great a clutch mode will disengage the back-driving force completely from the shaft connected to the actuator, thereby preventing damage to the actuator.

Described herein is a positioning spring configured to rotatably engage with a rotatable shaft. The rotatable shaft is configured to rotate relative to the positioning spring. The positioning spring comprises a first compliant lobe positioned at a first radial position. The first compliant lobe is configured to engage with one or more detent surfaces of the rotatable shaft to resist rotation of the rotatable shaft and to bias the rotatable shaft in one or more angular positions. The first compliant lobe is configured to flex upon engagement of the first compliant lobe with the rotatable shaft at a surface position out of contact with the detent surface.