Which factors influence the design of a ZIMM bevel gearbox of the ZK Series?

The design of a ZIMM bevel gearbox of the ZK Series is influenced by the operating factor fb, temperature factor ft, duty factor fe and speed factor fd. These factors are used in the calculations for design torque, design power and thermal limit power. The operating factor takes into account application case, operating time and starts per hour. Temperature factor, duty factor and speed factor are determined via table values. Which temperature factors apply when designing a ZIMM bevel gearbox of the ZK Series? The temperature factor f t is determined via the ambient temperature. Ambient temperature [°C] 10 15 20 25 30 35 40 45 50 Temperature factor f t 0,90 0,95 1,00 1,10 1,20 1,30 1,40 1,50 1,60 Which duty factors apply when designing a ZIMM bevel gearbox of the ZK Series? The duty factor f e is determined via the maximum duty factor in percent per 10 minutes. Max. duty factor [% / 10 min] 100 80 60 40 20 10 Duty factor f e 1,00 0,95 0,80 0,60 0,30 0,15 Which speed factors apply when designing a ZIMM bevel gearbox of the ZK Series? The speed factor f d is determined via the input speed n D . Input speed n D [min⁻¹] 0–500 500–1000 1000–1700 1700–2400 2400–3000 Speed factor f d 0,90 1,00 1,15 1,23 1,30

Factors for designing ZIMM ZK bevel gearboxes

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Author:

Jonathan Mildner | Head of Sales Technology

Last modified:

26.05.2026

The design of a ZIMM bevel gearbox of the ZK Series is influenced by the operating factor fb, temperature factor ft, duty factor fe and speed factor fd. These factors are used in the calculations for design torque, design power and thermal limit power. The operating factor takes into account application case, operating time and starts per hour. Temperature factor, duty factor and speed factor are determined via table values.

Which temperature factors apply when designing a ZIMM bevel gearbox of the ZK Series?

The temperature factor f_t is determined via the ambient temperature.

Ambient temperature [°C]	10	15	20	25	30	35	40	45	50
Temperature factor f_t	0,90	0,95	1,00	1,10	1,20	1,30	1,40	1,50	1,60

Which duty factors apply when designing a ZIMM bevel gearbox of the ZK Series?

The duty factor f_e is determined via the maximum duty factor in percent per 10 minutes.

Max. duty factor [% / 10 min]	100	80	60	40	20	10
Duty factor f_e	1,00	0,95	0,80	0,60	0,30	0,15

Which speed factors apply when designing a ZIMM bevel gearbox of the ZK Series?

The speed factor f_d is determined via the input speed n_D.

Input speed n_D [min⁻¹]	0–500	500–1000	1000–1700	1700–2400	2400–3000
Speed factor f_d	0,90	1,00	1,15	1,23	1,30

Jonathan Mildner | Head of Sales Technology

Jonathan Mildner heads the Sales Technology department at ZIMM. He is responsible for the design and safe integration of screw jacks, electromechanical actuators, and drive technology – including accessories from the ZIMM modular system, clearly defined interfaces, the safety concept, and complete documentation; he provides technical support for manufacturing to drawing (special parts/adaptations).

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