Unidirectional bearing is a kind of bearing that can rotate freely in one direction and lock in the other direction.

A metal housing containing a number of rollers, needles, or ball bearings, whose rolling seat is shaped so that it can roll in only one direction, while producing great resistance in the other direction (the so-called “unidirectional”).

In fact, no matter what structure of the unidirectional bearing, its principle is the clamping principle, from the structure can be divided into:

The outer ring of the bearing here is the same as the ordinary bearing, which is a bobbin type outer ring. But it has a special inner ring, which is a circle with a slope.

In addition, it has a roller which is always in contact with the inner and outer ring and a spring which is in contact with the roller. The working face of the roller is a slope, when the bearing along the turn, the roller is in the downhill state, the downhill space is large, the roller will not be affected.

When turning against, the roller is up the slope, the slope is narrow, the roller is stuck, and the bearing is locked.

This type of bearing is arranged between the inner ring and outer ring of the bearing will be a set of CAM wedge. CAM has two different sizes of diameter, wherein the size of the long warp is greater than the distance between the inner ring and the outer ring, and the short warp is less than the distance between the bearing inner ring and the outer ring.

A cylindrical winding spring is connected end to end between the wedges to form a circular spring arranged on the fulcrum of the wedge, and the wedge can be reset by the action of the spring.

Because the one-way bearing has been antirust treatment and packaging, so do not open the packaging before installation. The anti-rust oil coated on the unidirectional bearing has good lubrication performance. For unidirectional bearings for general purposes or unidirectional bearings filled with grease, it can be directly used without cleaning.

The installation method of one-way bearings varies according to the type of bearings and matching conditions.

Since most of them are shaft rotation, interference fit and gap fit can be used for the inner ring and the outer ring respectively, and interference fit is used for the outer ring when the outer ring is rotated.

(1) Press-in installation

Press installation is generally used, bolts and nuts can also be used, if necessary, can be used for installation hammer.

(2) Hot sleeve installation

The hot sleeve method of heating the unidirectional bearing in oil to expand it and then installing it on the shaft can prevent the unidirectional bearing from being subjected to unnecessary external forces and complete installation in a short time.

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