The inner plates and outer plates of a Tsubaki roller chain, like those of any roller chain, serve essential functions in the chain's operation and durability. Here's an overview of their functions:

Inner Plates:

Linking Elements: The primary function of the inner plates is to serve as linking elements within the chain. They are positioned between the pins and rollers and provide the connection between adjacent chain links.

Pin Attachment: Inner plates have holes through which the chain's pins pass. These holes secure the pins in place, allowing them to pivot as the chain moves around sprockets.

Strength and Durability: Inner plates are typically designed to withstand tensile and compressive forces, ensuring the overall strength and structural integrity of the chain.

Uniform Spacing: Inner plates maintain a uniform spacing between adjacent rollers, ensuring that the chain engages smoothly with sprockets and operates reliably.

Outer Plates:

Protection and Encapsulation: Outer plates encase the rollers and inner plates, providing a protective shield around the critical components of the chain. This encapsulation helps keep contaminants, dirt, and debris away from the inner workings of the chain, reducing wear and friction.

Engagement with Sprockets: The outer plates engage with the sprocket teeth during chain operation. They ensure that the chain maintains proper engagement with the sprocket, preventing slippage and facilitating smooth power transmission.

Load Distribution: Outer plates help distribute the loads and forces exerted on the chain during operation. They assist in transmitting these forces to the sprockets efficiently.

Attachment Points: In some Tsubaki roller chain designs, outer plates may have attachment points or holes for connecting attachments, such as conveyor fixtures or other accessories used in specific applications.