This power transmission device includes a motor, a worm connected to a rotating shaft of the motor, and a worm wheel engaged with the worm and disposed at an operation pedal side with respect to the worm, wherein a biasing member which biases the motor in a direction in which the worm and the worm wheel come in contact with each other when the motor is driven is disposed between the motor and a housing.

This power transmission device includes a motor, a worm connected to a rotating shaft of the motor, and a worm wheel engaged with the worm and disposed at an operation pedal side with respect to the worm, wherein a biasing member which biases the motor in a direction in which the worm and the worm wheel come in contact with each other when the motor is driven is disposed between the motor and a housing.

A worm drive for a power steering system of a motor vehicle is disclosed. The worm drive includes a worm gear, a worm which meshes with the worm gear, and an electric motor which drives the worm. One side of the worm is connected by a coupling to the electric motor and the other side of the worm is mounted in a floating bearing. The coupling consists of a hub and an elastic spring bush. The floating bearing is oval-shaped in order to allow vertical movements of the worm, and the worm is spring-loaded on the worm gear by the coupling.

A centrifugal scissor gear assembly includes main and secondary gears with one or more counterweights or weighted balls there between. Optionally a thrust washer retains the components together. In one form, the counterweights are pivotable between the main and secondary gear. In another form, the weighted balls move within matching trenches or grooves in the main and secondary gears. When the engine is operable and the main gear is rotated, the counterweights or weighted balls are moved radially outwardly due to the centrifugal force. The scissor gear assembly can vary pre-load and apply a lower pre-load at lower engine speeds and a higher pre-load at higher engine speeds. No springs are used to achieve bias torque and no special tools or procedures are required for installation since the gear teeth of the main and secondary gears are aligned when the scissor gear assembly is not operating.

A centrifugal scissor gear assembly includes main and secondary gears with one or more counterweights or weighted balls there between. Optionally a thrust washer retains the components together. In one form, the counterweights are pivotable between the main and secondary gear. In another form, the weighted balls move within matching trenches or grooves in the main and secondary gears. When the engine is operable and the main gear is rotated, the counterweights or weighted balls are moved radially outwardly due to the centrifugal force. The scissor gear assembly can vary pre-load and apply a lower pre-load at lower engine speeds and a higher pre-load at higher engine speeds. No springs are used to achieve bias torque and no special tools or procedures are required for installation since the gear teeth of the main and secondary gears are aligned when the scissor gear assembly is not operating.

A support member may be connectable in a removable and adjustable manner to a track assembly. The support member may include an electrical connector, a contact, and a biasing member. The electrical connector may be adjustable to a first position and a second position. The contact may be connected to the electrical connector and configured to engage a conductor of said track assembly. The contact may be engageable with said conductor when the electrical connector is in the first position. The contact may not be engageable with said conductor when the electrical connector is in the second position. The biasing member may be configured to bias the contact into engagement with said conductor when the electrical connector is in the first position.

A support member may be connectable in a removable and adjustable manner to a track assembly. The support member may include an electrical connector, a contact, and a biasing member. The electrical connector may be adjustable to a first position and a second position. The contact may be connected to the electrical connector and configured to engage a conductor of said track assembly. The contact may be engageable with said conductor when the electrical connector is in the first position. The contact may not be engageable with said conductor when the electrical connector is in the second position. The biasing member may be configured to bias the contact into engagement with said conductor when the electrical connector is in the first position.

A mechanical device includes a worm gear mechanism which includes a worm wheel and a worm shaft. The worm gear mechanism adjusts backlash between the worm and the worm wheel by movement of the worm shaft in an axis line direction. The mechanical device includes a position adjusting mechanism which includes a holder, an axial force generation part and a base part. The holder is screwed into the accommodation hole and rotatably supports the worm shaft. The holder causes the movement of the worm shaft by rotation. The axial force generation part includes a screw part and exerts an axial force on the holder. The base part is provided to the frame and receives a reactive force acting on the axial force generation part as a result of exerting the axial force to the holder.

A mechanical device includes a worm gear mechanism which includes a worm wheel and a worm shaft. The worm gear mechanism adjusts backlash between the worm and the worm wheel by movement of the worm shaft in an axis line direction. The mechanical device includes a position adjusting mechanism which includes a holder, an axial force generation part and a base part. The holder is screwed into the accommodation hole and rotatably supports the worm shaft. The holder causes the movement of the worm shaft by rotation. The axial force generation part includes a screw part and exerts an axial force on the holder. The base part is provided to the frame and receives a reactive force acting on the axial force generation part as a result of exerting the axial force to the holder.

A starting protector for an all-terrain vehicle is provided and includes a shaft, a driven wheel fitted over the shaft and comprising a tooth portion, a sleeving portion and a locking portion, and the tooth portion being configured to be connected with an engine; a driving wheel fitted over the sleeving portion, one side of the driving wheel being attached to the tooth portion, and the driving wheel being configured to be connected with a starting motor; a friction piece fitted over the sleeving portion and being in synchronous rotation with the sleeving portion, the friction piece being attached to the other side of the driving wheel, and when starting torque of the engine exceeds a preset value, the driving wheel and the friction piece slipping relatively; and a compressing assembly fitted over the sleeving portion and the locking portion to compress the friction piece and the driving wheel.