A drive (1) with a housing (2) and a toothed part (4) which is mounted rotatably relative thereto with a wire race bearing (15), wherein a threaded ring (23) is screwed onto the housing (2) or the toothed part (4), said threaded ring axially fixing the wire race bearing (15) and permitting an adjustment.

A torque transfer device has plural planets arranged for planetary rotation about one or more sun gears and within one or more ring gears. Each planet includes at least one planetary gear set comprising plural planetary gears connected to rotate together, but having a different diameter to form a differential gear system. To improve load sharing, the plural planetary gears of each planetary gear set may have a different helical angle, the plural planetary gear sets being axially movable with respect to one another. Alternatively or in addition, the planetary gears may be made flexible with respect to radial forces.

A gear backlash control mechanism includes a base, a worm gear pivoted to the base, a driving member, a biasing member, a driving worm set having a first shaft, a first worm and a first linkage structure jacketing the first shaft, and a driven worm set having a second shaft, a second worm axially slidable on the second shaft, and a second linkage structure fixed to the second shaft and linked to the first linkage structure. The driving member rotates the worm gear via the first shaft and the first worm and rotates the second worm via the first and second linkage structures and the second shaft. When the worm gear rotates, the first worm abuts against a first tooth surface of each tooth of the worm gear sequentially, and the biasing member pushes the second worm to abut against a second tooth surface of each tooth sequentially.

A power steering device includes a bearing rotatably supporting the tip side of a worm shaft, a gear case provided with the housing hole for housing the worm shaft and a holder housing the bearing. The holder includes a first holder holding the bearing, a second holder having the guide part configured to guide a movement of the second bearing toward a worm wheel, and a spring provided in a compressed state between the first holder and the second holder and configured to bias the first holder toward the worm wheel. The second holder includes a holder opening part configured to allow the bearing and the first holder to pass through thereof in the guiding direction of the guide part to guide the bearing, and the first holder faces an inner peripheral surface of the housing hole through the holder opening part.

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 cam transmission mechanism includes a rotary disk, a camshaft, contact members and a housing. The rotary disk has a periphery formed with equidistant projections, any two adjacent ones of which define an accommodating recess. The camshaft includes a shaft rod and a cam body that has at least one groove communicated with some of the recesses of the rotary disk. The groove and the recesses cooperate to form a plurality of confining spaces, within which the contact members are accommodated freely rollably for rotation transfer from the camshaft to the rotary disk. The housing is connected to the rotary disk for confining the contact members in the confining spaces, respectively.

The present disclosure relates to pinion assembly preloading systems and methods of operation. Disclosed are systems including a press actuator that applies an axial force against a pinion assembly; a force sensor that measures a reaction force at the pinion assembly; and a method of controlling the press actuator according to a change in the reaction force.

A cam transmission mechanism includes a rotary disk, a camshaft, contact members and a housing. The rotary disk has a periphery formed with equidistant projections, any two adjacent ones of which define an accommodating recess. The camshaft includes a shaft rod and a cam body that has at least one groove communicated with some of the recesses of the rotary disk. The groove and the recesses cooperate to form a plurality of confining spaces, within which the contact members are accommodated freely rollably for rotation transfer from the camshaft to the rotary disk. The housing is connected to the rotary disk for confining the contact members in the confining spaces, respectively.

A gearbox assembly includes a housing, a cover, a screw rod inserted through the housing along a first direction, a worm wheel integrally formed on the screw rod, and a worm arranged in the housing along a second direction perpendicular to the first direction. The worm is driven into rotation by a driving shaft, so that the worm drives the worm wheel and the screw rod into rotation through a kinetic pair. The screw rod moves a lifting mechanism attached to the screw rod in a vertical direction through screw transmission. A stop pin is arranged on the housing and positioned in the direction of extension of a free end of the driving shaft of the worm against the free end.

An end play measurement apparatus is provided that measures end play of a tapered roller bearing of a gear unit. The gear unit supports a large-gear shaft, with which a gear is fitted, via the tapered roller bearing. The end play measurement apparatus includes a power generation unit, which is fixed to the large-gear shaft and generates power to move the gear unit backward and forward in the axial direction, a position change unit, which is interposed between the power generation unit and the gear unit and changes the axial position of the gear unit by using the power of the power generation unit, and a booster mechanism, which has a free end that receives the power of the power generation unit to boost the power.