The raceways of duplex bearings are slightly offset but come together when the proper preload is applied during assembly.ĭuplex bearings are ordered as a pair and are machined to provide an assembly with flush faces when assembled. ![]() Duplex bearings are manufactured to be stack-mounted with the bearing faces adjacent to each other. Angular contact bearings can carry both radial and axial loads due to this larger contact angle.Īngular contact bearings that are manufactured in matched pairs are referred to as duplex bearings. The amount of the contact angle is predetermined and designed into the bearings. Angular contact bearings are machined to have larger contact angles when preloaded, typically 15°, 25°, 30° or 40°. Preloading of angular contact bearings is mandatory, while preloading of deep groove ball bearings is optional.Ĭontact anlgle for angular contact bearing Source Kayden BearingĬontact angles for deep groove radial bearings are small, measuring 8° or less. This creates a line of contact between the inner race, the ball and the outer race that is referred to as the contact angle. When an axial load is applied to the inner ring of the bearing, the race of the inner ring comes in contact with the rolling element and translates this load to the raceway of the outer ring. Bearing types Ball bearingsĪll radial ball bearings that require a preload must be loaded axially. Depending on the bearing type, the preload is applied either radially or axially. The shoulder should be large enough to exceed the point of tangency between the corner radius and the face of the bearing, but small enough to allow for bearing removal with standard bearing pullers.īearing manufacturers provide tables or calculators indicating the proper shoulder dimensions and tolerances for each bearing type and size. The shaft and housing shoulders locate one surface of the bearing, assuring the loading will be in line with the shaft axis. The preferred method of locating bearings on a shaft or housing is to provide a shoulder that is machined perpendicular to the shaft axis. This will increase friction and heat generation, which can ultimately lead to premature bearing failure. Proper preload allows the rolling elements to freely rotate in the bearing races, while excessive preload could lead to skidding. It must be sufficient to reduce the excess play, but care must be taken not to apply too much preload. The amount of preload applied is important. Deep groove ball bearings can be preloaded, but it is not required in most applications. ![]() Additionally, preloading eliminates skidding of rolling elements and keeps them in the proper location in the bearing.ĭeep groove ball bearing preloaded by nut against shaft shoulder Source: IEEE GlobalSpecMany types of rolling element bearings require some form of preload for proper operation, including angular contact ball bearings, tapered roller bearings and cylindrical roller bearings. Plastic spacers (4 x 5mm & 2 x 2mm thickness) are included for extra preload, if required, up to 12mm extra preload per cap.Along with the elimination of clearances, preloading bearings also increases the stiffness of the assembly, improves rotational accuracy and decreases noise due to vibration or resonance. Hard anodised black aluminium outer, with stainless-steel internals.įitted with M3 csk bleed screws (different to M4 screws on OEM cap). ![]() These will work with OEM KYB forks with OEM fork internals only. ![]() Simple, and straightforward to fit, a special pin spanner is provided to fit, and remove the caps. They replace the OEM fork caps, whilst still retaining the rebound adjustment in the top, and offer up to 11mm of fork preload adjustment on each leg, to achieve the optimum sag settings in order to get the best performance both on, and off-road.īy simply turning the centre 22mm hex, using spanner provided, each turn can add, or remove 1mm of preload. Our own design of billet Fork Preload Adjusters were developed by us to improve the adjustability and personalisation of the Yamaha T7 Tenere fork set-up.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |