A power transfer unit includes an input shaft extending along an input axis and an intermediate drive shaft extending at least partially through the input shaft along the input axis. The power transfer unit further includes a ring gear assembly having a ring gear and a ring gear shaft coupled to the ring gear. The ring gear shaft at least partially surrounds the input shaft and extends along the input axis. The power transfer unit also includes a collar coupled to the input shaft. The collar surrounds the input shaft and is movable relative to the ring gear shaft along the input axis between an engaged position and a disengaged position. When the collar is in the engaged position, the input shaft is coupled to the ring gear shaft. When the collar is in the disengaged position, the input shaft is decoupled from the ring gear shaft.

A power transfer unit includes an input shaft extending along an input axis and an intermediate drive shaft extending at least partially through the input shaft along the input axis. The power transfer unit further includes a ring gear assembly having a ring gear and a ring gear shaft coupled to the ring gear. The ring gear shaft at least partially surrounds the input shaft and extends along the input axis. The power transfer unit also includes a collar coupled to the input shaft. The collar surrounds the input shaft and is movable relative to the ring gear shaft along the input axis between an engaged position and a disengaged position. When the collar is in the engaged position, the input shaft is coupled to the ring gear shaft. When the collar is in the disengaged position, the input shaft is decoupled from the ring gear shaft.

The present invention has disclosed a clutch, a motor device, a curtain control device and a curtain. The clutch comprises a drive force outputting part, a transmission part, sleeved between the drive force outputting part, and a clutch piece mounting position is provided on the transmission part; a drive force receiving part with a driving force transmitting part, arranged on the side of the transmission part away from the driving force receiving part; a clutch control part, disposed on one side of the driving force receiving part, comprising a combination piece, disposed on the drive force receiving part; a separation accommodation zone, arranged between two combination surfaces; a clutch piece, arranged on the clutch piece mounting position. The embodiments of the present invention effectively solve the problems resulting from use of magnetic separation in realizing engaging and disengaging functions of an existing clutch.

The present invention has disclosed a clutch, a motor device, a curtain control device and a curtain. The clutch comprises a drive force outputting part, a transmission part, sleeved between the drive force outputting part, and a clutch piece mounting position is provided on the transmission part; a drive force receiving part with a driving force transmitting part, arranged on the side of the transmission part away from the driving force receiving part; a clutch control part, disposed on one side of the driving force receiving part, comprising a combination piece, disposed on the drive force receiving part; a separation accommodation zone, arranged between two combination surfaces; a clutch piece, arranged on the clutch piece mounting position. The embodiments of the present invention effectively solve the problems resulting from use of magnetic separation in realizing engaging and disengaging functions of an existing clutch.

A clutch for selectively preventing rotation of a rotating component may include a first and second pawls pivotable between engagement and disengagement with the rotating component to selectively prevent or allow rotation of the rotating component in one or both directions. An armature moveable between a first and second armature positions may have a common member pivotally connected thereto and engaging the first and second pawls, with a torque spring biasing the common member to rotate toward the first pawl and away from the second pawl. In an intermediate armature position, the common member may disengage the first pawl from the rotating component while engaging the second pawl to allow rotation in one direction while preventing rotation in the opposite direction. In embodiments, a clutch may include a cam actuator rotating to selectively control engagement of the pawls with the rotating component and locking in one or both directions.

A clutch for selectively preventing rotation of a rotating component may include a first and second pawls pivotable between engagement and disengagement with the rotating component to selectively prevent or allow rotation of the rotating component in one or both directions. An armature moveable between a first and second armature positions may have a common member pivotally connected thereto and engaging the first and second pawls, with a torque spring biasing the common member to rotate toward the first pawl and away from the second pawl. In an intermediate armature position, the common member may disengage the first pawl from the rotating component while engaging the second pawl to allow rotation in one direction while preventing rotation in the opposite direction. In embodiments, a clutch may include a cam actuator rotating to selectively control engagement of the pawls with the rotating component and locking in one or both directions.

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, and a clutch. The sprocket support body is rotatably mounted on the hub axle to rotate about a rotational axis. The sprocket support body is rotatable relative to the hub axle and the hub shell about the rotational axis. The clutch has a first coupling state where a pedaling rotational force is transmitted from the sprocket support body to the hub shell in a first rotational direction during pedaling, a first release state where the hub shell is rotatable relative to the sprocket support body in the first rotational direction during coasting, and a second coupling state where a coasting rotational force is transmitted from the hub shell to the sprocket support body in the first rotational direction during coasting.

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, and a clutch. The sprocket support body is rotatably mounted on the hub axle to rotate about a rotational axis. The sprocket support body is rotatable relative to the hub axle and the hub shell about the rotational axis. The clutch has a first coupling state where a pedaling rotational force is transmitted from the sprocket support body to the hub shell in a first rotational direction during pedaling, a first release state where the hub shell is rotatable relative to the sprocket support body in the first rotational direction during coasting, and a second coupling state where a coasting rotational force is transmitted from the hub shell to the sprocket support body in the first rotational direction during coasting.

In a drive cam groove, a groove bottom is sloped such that a depth of the groove bottom continuously decreases from one end to the other end of the drive cam groove. The drive cam groove has: a first drive cam groove that is formed such that a distance between a center of a drive cam and the groove bottom at the first drive cam groove continuously changes from the one end toward the other end of the drive cam groove; and a second drive cam groove that is formed such that a distance between the center of the drive cam and the groove bottom at the second drive cam groove is constant from the first drive cam groove to the other end of the drive cam groove.

In a drive cam groove, a groove bottom is sloped such that a depth of the groove bottom continuously decreases from one end to the other end of the drive cam groove. The drive cam groove has: a first drive cam groove that is formed such that a distance between a center of a drive cam and the groove bottom at the first drive cam groove continuously changes from the one end toward the other end of the drive cam groove; and a second drive cam groove that is formed such that a distance between the center of the drive cam and the groove bottom at the second drive cam groove is constant from the first drive cam groove to the other end of the drive cam groove.