A blower, a motor assembly and a centrifugal friction clutch thereof are provided. The centrifugal friction clutch includes: a fixing member for being fixed on a rotary shaft and comprising a guiding groove disposed in a radial direction of the fixing member and passing through an outer circumferential surface of the fixing member; a centrifugal block disposed in the guiding groove and slidable in the guiding groove; and a loading wheel having an inner hole in which the fixing member is received. A gap between a wall of the inner hole and the outer circumferential surface of the fixing member is less than a length of the centrifugal block along its sliding direction. The centrifugal friction clutch reduces vibrations at startup of the motor, thereby effectively reducing the vibrational noise. In addition, this also avoids the startup failure of the motor and effectively improves the startup performance of the motor.

A centrifugal friction clutch is provided which includes a first friction member to be fixed on a rotary shaft; a support portion to be fixed on the rotary shaft; a centrifugal device disposed on the support portion, the centrifugal device including a cam portion and a centrifugal arm extending the cam portion, the cam portion being rotating relative to the support portion when the centrifugal arm moves; and a friction connecting member disposed between the first friction member and the support portion. When the support portion rotates along with the rotary shaft, a free end of the centrifugal arm moves radially outwardly under a centrifugal force and drives the cam portion to rotate, the cam portion urges the friction connecting member toward the first friction member when the cam portion rotates.

A centrifugal friction clutch is provided which includes a first friction member to be fixed on a rotary shaft; a support portion to be fixed on the rotary shaft; a centrifugal device disposed on the support portion, the centrifugal device including a cam portion and a centrifugal arm extending the cam portion, the cam portion being rotating relative to the support portion when the centrifugal arm moves; and a friction connecting member disposed between the first friction member and the support portion. When the support portion rotates along with the rotary shaft, a free end of the centrifugal arm moves radially outwardly under a centrifugal force and drives the cam portion to rotate, the cam portion urges the friction connecting member toward the first friction member when the cam portion rotates.

An actuator and its clutch are provided. The clutch includes a driving shaft; a mounting base fixed to the driving shaft for rotation with the driving shaft; a connecting base for connecting with a load, the connecting base including fingers surrounding an outer circumference of the driving shaft; resilient member including a resilient member, the resilient member having two ends respectively fixed to the mounting base and the connecting base, the resilient member surrounding an outer circumference of the connecting tabs. When a rotation speed of the driving shaft is greater than a rotation speed of the connecting base, an inner diameter of the resilient member gradually decreases so as to gradually couple the coupling portion with the driving shaft, such that the rotation speed of the coupling portion gradually approaches or reaches the rotation speed of the driving shaft. The present invention can provide a buffering function at the phase of the startup of the motor to avoid the motor startup failure and damage to the motor.

A clutch having an inner ring, an outer ring, a plurality of sprags positioned between the inner ring and the outer ring, and a spring biasing each of the plurality of sprags towards the outer ring. Each of the plurality of sprags are movable between a disengaged position spaced from the inner ring and an engaged position contacting both the inner ring and the outer ring to rotationally unitize the inner ring and the outer ring.

A clutch having an inner ring, an outer ring, a plurality of sprags positioned between the inner ring and the outer ring, and a spring biasing each of the plurality of sprags towards the outer ring. Each of the plurality of sprags are movable between a disengaged position spaced from the inner ring and an engaged position contacting both the inner ring and the outer ring to rotationally unitize the inner ring and the outer ring.

A spring and damper assembly for a centrifugal clutch for a CVT, the CVT having a clutch hub rotatably located within a drum and a plurality of clutch shoes slidingly disposed within the clutch hub. Each shoe includes a spring cavity, the spring and damper assembly being located within the spring cavity. The spring and damper assembly includes a spring disposed within the spring cavity and a spring retainer located within the spring cavity and positioned against one end of the spring. The spring retainer is engaged with the clutch hub and configured to locate the spring within the spring cavity. A dampener is located within the spring. The dampener is made from a material configured to reduce motion of the spring.

A spring and damper assembly for a centrifugal clutch for a CVT, the CVT having a clutch hub rotatably located within a drum and a plurality of clutch shoes slidingly disposed within the clutch hub. Each shoe includes a spring cavity, the spring and damper assembly being located within the spring cavity. The spring and damper assembly includes a spring disposed within the spring cavity and a spring retainer located within the spring cavity and positioned against one end of the spring. The spring retainer is engaged with the clutch hub and configured to locate the spring within the spring cavity. A dampener is located within the spring. The dampener is made from a material configured to reduce motion of the spring.

A spring and damper assembly for a centrifugal clutch for a CVT, the CVT having a clutch hub rotatably located within a drum and a plurality of clutch shoes slidingly disposed within the clutch hub. Each shoe includes a spring cavity, the spring and damper assembly being located within the spring cavity. The spring and damper assembly includes a spring disposed within the spring cavity and a spring retainer located within the spring cavity and positioned against one end of the spring. The spring retainer is engaged with the clutch hub and configured to locate the spring within the spring cavity. A dampener is located within the spring. The dampener is made from a material configured to reduce motion of the spring.

A chainsaw includes a sprocket coupled to a chain and configured to drive the chain, wherein the sprocket comprises a receiving area defining a drive surface; a clutch disposed at least partially in the receiving area of the sprocket, wherein the clutch comprises: a hub defining a central axis, the hub being rotationally keyed to an output shaft of a motor; a centrifugal weight disposed between the hub and the sprocket and movable in a radial direction relative to the central axis; and a spring compressed between the hub and the centrifugal weight to bias the centrifugal weight in a radial direction towards the central axis; wherein the centrifugal weight comprises a drive feature on a radially outer surface, and wherein the drive feature is configured to selectively interface with the drive surface of the sprocket when the output shaft is rotating above a threshold rotational speed.