Tsubaki RS® Roller Chain 'G7' - Tsubakimoto Chain - #29

5. General Selection Method

Check information required for selection

[ Step 1 ]

Ordinary transmission

(forward/reverse),

continual revolution transmission

(1) Select chain and number of teeth of small sprocket

Use the provisional selection graph (Fig. 2) or the kW ratings tables to ob­tain a chain and small sprocket number of teeth that satisfy the revolution speed of the high-speed shaft and the transmission kW. Select a chain with the smallest pitch that has the required kW ratings.

If a single strand chain does not have sufficient power, select a multi-strand chain. If site restrictions require a short distance between shafts and the small­est possible sprocket outer diameter, use a multi-strand roller chain with a small pitch.

(2) Select number of teeth for large sprocket

Once the number of teeth of the small sprocket has been decided, the num­ber of teeth of the large sprocket is de­termined by multiplying the number of teeth of the small sprocket by the speed ratio.

The number of teeth of the small sprocket should be at least 15. How­ever, it is not desirable if this causes the number of teeth of the large sprocket to exceed 120. In this event, the number of teeth of the small sprocket must be reduced; however, it is recommended to use more than 13 teeth.

When the number of links is odd

If the number of links is odd, it is best to avoid using an offset link and in­stead change the distance between shafts so that the number of links is even. If the one-pitch offset link of RS roller chain or the four-pitch offset link of SUPER chain is used, allow for a de­crease of transmission power as ex­plained in the notes in the kW ratings tables.

[ Step 2]

[ Step 3]

For small sprockets, use Z' > 15^T For large sprockets, useZ< 120^T

Decide the number of teeth Z of the large sprocket from the speed ratio: I

Calculate chain length (number of links) L

Decide lubrication method based on small sprocket RPM