Applications
3.1 Bearing Bush Chain Light to heavy conveyance: No elongation, electric, electronic, precision machinery industries Application Examples Bearing Bush Chain (Figure 3.3) is used in automatic assembling, packaging, filling, and parts installation for a variety of industries, including electric, elec- tronic, semiconductor, automobile, and food as well as in other precision machinery. It includes the following features: (1) High accuracy and no elongation. (2) Interchangeability with other double pitch roller chains and large pitch conveyor chains. (3) Low cost.
Figure 3.3 Bearing Bush Chain
Constructions and Features Usually chains are designed with gaps between the pins and bushings for proper operation. With Bearing Bush Chain, needle bearings are installed between the pins and bushings. These add rolling elements between these components and eliminate the sliding friction (Figure 3.4).
Profile of Bearing Portion
Bushing
Needle Bearing
Roller
Pin
Lubricated Between Pin and Bushing
Figure 3.4 Needle Bearings in Precision Chain
The advantages of this design include: (1) Immediately after installation, the chain stretches a little (less than 0.03 percent) to fit the contacting surface of chain parts. After that, it doesn’t stretch (Figure 3.5). The results include the following points:
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