Wedge blocks for bearing technical principle

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Release time:

2021-08-13

Wedge blocks for bearing is a kind of bearing that can rotate freely in one direction and lock in the other direction. The metal shell of Wedge blocks for bearing contains a lot of rollers, needles or balls, and the shape of the rolling seat (hole) makes it only roll in one direction, and it will produce a lot of resistance in the other direction. .
The working principle of Wedge blocks for bearing:
1. Wedge blocks for bearing wedge design
This wedge-type one-way overrunning clutch is generally composed of an inner ring, an outer ring, a wedge group, a wedge cage, a powerful spring and a bearing. The wedges transfer force from one raceway to the other raceway by wedging between the inner and outer rings. The wedge has two diagonal diameters, (that is, the distance from one corner of the wedge to the other diagonal) one of them is larger than the other. The wedge action occurs when the inner and outer rings rotate relative to each other, forcing the wedge to have a larger vertical position on a larger cross section.
2. Wedge blocks for bearing self-locking angle The wedge function mainly depends on the wedging and self-locking angle of the wedges between the inner and outer rings.

The basic concept of the wedge one-way clutch requires that the friction coefficient of the wedge is related to the sudden torque generated by the inner ring in the driving direction. This friction value must be greater than the tangent value of the self-locking angle. If the conditions are not safe, wedging will not happen.

The self-locking angle is determined by the structure of the wedge, and the points on the inner and outer rings are connected with the wedge respectively. The design of the wedge has a very low initial self-locking angle to ensure an absolute bond at the beginning. As the torque increases, a radial force will be generated on the wedge that deflects the wedge raceway, causing the wedge to roll to a new position. The wedge is often designed to have a self-locking angle that can be gradually increased, just as it goes from the overriding position to the maximum load-bearing position. A relatively large self-locking angle can reduce the radial force generated by the wedge, so as long as the elongation and the Brinell hardness limit are required to allow a larger torque to be transmitted.
3.Wedge blocks for bearing slope and roller design
Slope and roller type one-way clutches are basically composed of a cylindrical inner diameter outer ring, an inner ring with a slope, and a set of rollers that bear the spring force and are always in close contact with the inner and outer rings. As long as the rotation of one of the raceways in the direction of its motion affects the other, this arrangement essentially ensures the instantaneity of the overrun speed and the immediate driving capability.
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