Dimensioning Linear Chains

1. Introduction

The dimensioning of linear chains (including TowerChain) requires careful calculation and selection of the right parameters to ensure efficient and reliable operation in an application. Here are the key metrics that should be considered when dimensioning linear chains and:

2. Chain pitch (p)

1. The chain pitch (also known as chain spacing) is the distance between the chain links, measured in millimeters (mm).
2. The pitch affects the movement of the chain and is crucial for the synchronization of multiple linear chains.
3. Typical pitches for linear chains are 25.40 mm and 60 mm.

3. Lift per shaft rotation

1. The lift per shaft rotation indicates how much the chain moves vertically when the drive shaft (e.g., a motor) completes one full rotation.
2. This value depends on the chain pitch and the gear ratio. With a 1:1 gear ratio, the lift per rotation equals the chain pitch.
3. If the gear ratio is different, the lift distance must be adjusted accordingly.

4. Drive speeds (n)

The drive speed defines the rate in RPM (revolutions per minute) in min⁻¹ at which the drive motor rotates the drive shaft of the linear chain. By using the chain pitch, the speed at which the chain moves can be determined.

5. Required torque (Mt)

The required torque at the drive shaft depends on the lifting force (F).

6. Required power (P)

The required power at the output shaft depends on the torque (Mt) that the chain needs to transmit.

7. Calculation Principles

Required torque Mt [Nm] at the drive shaft for a lifting force F [N].

The pitch is the distance between the pins

1. Pitch 25 mm; d = 65.3 mm
2. Pitch 40 mm; d = 80 mm
3. Pitch 60 mm; d = 120 mm
4. (η = approx. 0.8 without storage)
5. (η = approx. 0.65 with storage)

Required power P [kW] at the pinion shaft with torque Mt [Nm].

8. Calculation of chain length and number of chain links

8.1 Calculation for chains without special end link

90° deflection

8.2 Calculation for chains with special end link

90° deflection

90° + 90° deflection

9. Permissible stroke force for linear chains in horizontal applications

Stroke lengths greater than 4000 mm should generally be guided. The values in the diagrams refer to horizontal applications where the linear chain rests on a surface and the load is guided. For shock loads and high switching frequencies (more than 15 strokes per hour), the use of the next larger chain is recommended. Please contact us, as reinforced versions are available upon request.