Something about rod ends bearings

Rod end bearings

1, Description of the rod end

In rod end bearings there is a mechanical joint, also called a home joint or rosette joint. Such joints are use at the ends of control rods, steering rods, tie rods, or wherever a precision joint is require. It usually consists of a spherical inner ring and a cylindrical hole for shaft mounting.

2, Different dimensions and characteristics

Rod ends are differentiate by different dimensional specifications and features. Load capacity and maximum angular misalignment are the main specifications to be consider. In most cases, the bearing movement is symmetrical and the maximum angular misalignment is half of the total lateral range. Dimensional specifications include units of construction, bore diameter, major diameter, bearing thickness, housing diameter, overall length, and the thread length.

English units of measurement include inches (in) and fractions of an inch. Metric units of measurement are millimeters (mm) and centimeters (cm). Bore diameter is the inside diameter (ID) of the bearing bore. The major diameter is the nominal diameter to the top of the thread. Bearing thickness is the length through the bore.

Housing diameter is the outside diameter (OD) of the bearing housing. Overall length is the distance from the top of the housing to the end of the shaft. Some rod ends are self-lubricating or have a lubrication hole.

3, Different thread

A ball joint with an opening through which a bolt or other fastener can pass is press into a circular housing to which a threaded portion is attach. The threaded portion may have either an external or internal thread. Rod ends are attach to rods and shafts via an externally threaded male bolt or an internally threaded female housing. Right-hand threads tighten in a clockwise direction and are the most common type of thread. Left-hand threads tighten counterclockwise and must match the mating part.

4, Rod ends made of different materials.

Metal rod ends are made of brass, bronze, iron or steel, and often coated with zinc or chrome. Non-metallic products are made of plastic, nylon, and so on.

5, Applications of rod ends

These bearings can use at the ends of cylinders, linkages, rods, and shafts to compensate for angular misalignment between connected parts. In addition, they can also use in many aerospace, military, automotive, and some applications that accommodate low to medium shaft misalignment.

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