An adjustable spacer with a non-hardened intermediate portion therebetween is mountable between a pair of roller bearings also mounted on a shaft such an axle or spindle or the like. The intermediate portion allows the spacer to collapse in the axial direction to maintain desired axial loads on the bearings.

A bearing preload apparatus may include a gearbox assembly, a coupling assembly, and a sensor assembly. The gearbox assembly may include a gearbox housing, a first shaft and a second shaft. The first and second shafts may extend out of the housing and may be rotatable simultaneously with each other at different speeds. The coupling assembly may include a first driver coupling connected to the first shaft and a second driver coupling connected to the second shaft. The sensor assembly may be mounted to a stationary structure and the gearbox housing. The sensor assembly may measure a reaction torque of the gearbox assembly relative to the stationary structure.

A method for determining the preload value of the screw based on thermal error and temperature rise weighting. Firstly, thermal behavior test of the feed shaft under typical working conditions is carried out to obtain the maximum thermal error and the temperature rise at the key measuring points in each preloaded state. Then, a mathematical model of the preload value of the screw and the maximum thermal error is established; meanwhile, another mathematical model of the preload value of the screw and the temperature rise at the key measuring points is also established. Finally, the optimal preload value of the screw is obtained. The thermal error of the feed shaft and the temperature rise of the moving components are comprehensively considered, improving the processing accuracy and accuracy stability of the machine tool, and ensuring the service life of the moving components such as bearings.

A ball bearing assembly includes a one piece outer ring having a first and second outer race and an exterior surface; and a one piece inner ring having a first and second inner race, the inner ring is integrally formed on a shaft. A first plurality of balls is disposed between the first outer race and the first inner race; and a second plurality of balls is disposed between the second outer race and the second inner race. The first plurality of balls has a first contact and the second plurality of balls has a second contact angle.

A method of making a preloaded bearing arrangement and a preloaded bearing arrangement are provided. The method comprises the steps of placing a bearing around a shaft and then placing a frustoconical disc spring around the shaft such that a portion of the disc spring abuts the bearing. A deformable cup is placed around the shaft, and an annular section of the deformable cup is spaced apart from the frustoconical disc spring and the cup is held at a fixed position along the shaft. A split shim is inserted between the annular section of the deformable cup and the disc spring to apply a preload to the disc spring. The deformable cup is then deformed such that a sidewall of the deformable cup extends around the split shim to hold the split shim in place relative to the shaft.

A system for an unmanned aerial vehicle can include an altitude control system, which further includes a compressor assembly, a valve assembly, and an electronics assembly. The compressor assembly may include a driveshaft and a bearing assembly configured to rotate the driveshaft. The driveshaft may be formed from a first material and a compressor housing may be formed from a second material. The first and second materials may have different rates of thermal expansion. A dynamic preloading mechanism, such as a flexible plate, may be provided within the compressor assembly to exert a preloading force on the bearing assembly. Throughout the duration of the flight of the unmanned aerial vehicle, the preloading mechanism can continually compensate for differences in rates of thermal expansion between the first and second materials throughout

A lock nut system includes a nut, a keeper engagement with the nut to inhibit movement of the keeper relative to the nut, and a keeper retaining member. The keeper has a radially inner side configured to engage a shaft to inhibit rotational movement of the nut relative to the shaft when the keeper engages the nut and a radially inner side engages the shaft. The keeper retaining member is secured to the keeper and is engageable with the nut to hold a keeper axially such that keeper is engaged with the nut. A cover member is located on an opposite side of the keeper retaining member relative to the nut and engaged to the keeper retaining member to inhibit a separation of the cover member from the keeper retaining member in such that that the separation of the cover member from the keeper retaining member provides a visual indication to a user.

A method for preloading a bearing includes releasably, threadably, and directly attaching an attaching member to a circumferential outside surface of an exposed end of a threaded shaft of an axle or spindle. A frame is axially separated from, and coupled to, the attaching member. A plurality of extensions extends from the frame axially past the attaching member toward the wheel hub assembly. An adjustment mechanism moves the frame and the plurality of extensions axially towards the wheel hub assembly to contact the wheel hub assembly and/or the bearing to apply a preload to the bearing within the wheel hub assembly.

A technique for swinging swing arms stably by reducing vibrations of bearing units due to resonance in rolling bearings is provided. A pivot assembly bearing device 1 includes a shaft 10 extending in an axis Y1 direction, and an upper bearing unit 20 and a lower bearing unit 60 that are provided along the axis Y1 direction of the shaft 10. A natural frequency of the upper bearing unit 20 and a natural frequency of the lower bearing unit 60 in the axis Y1 direction of the shaft 10 differ from each other.

The present disclosure relates to a rotation unit and method for adjusting bearing clearance. The rotation unit includes a shaft that is rotated around its longitudinal axis by a rotating motor. The shaft is supported to a body of the rotation unit by a bearing assembly. The rotation unit further includes an adjusting arrangement for generating pre-load for the bearing assembly and adjusting bearing clearance. The adjusting arrangement includes an axial adjusting space and at least one pair of half-elements arranged between axial adjusting surfaces limiting the adjusting space.