What is the difference between bevel-helical, foot-mounted helical and parallel-shaft gearboxes?

Category: Gearbox Selection and Use · 2. question

All three use helical gear stages; what separates them is where the output shaft sits relative to the motor and how the gearbox is fixed to the machine. This choice usually follows from the machine layout.

Type	HEM series	Output shaft position	Suitable layout
Bevel-helical	K series 223, 455, 515, 7515	90° to the motor axis	Drives where the motor should run along the machine body
Foot-mounted helical	M-HEM 37–157	In line with the motor	Drives fixed by feet to the floor or a base frame
Parallel-shaft	HF37–HF127	Parallel to the motor axis, offset	Drives where the motor sits beside the machine shaft and a short length is needed

According to the tables on the product pages, the typical ratio range of the M-HEM and HF series runs from about 3.5 to 290 depending on frame size. First the output direction and mounting are fixed, then the frame size is chosen for the required torque. Details: M-HEM foot-mounted helical gearboxes and HF parallel-shaft gearboxes.

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Other questions on this topic

1. Should I choose a worm gearbox or a helical gearbox?
2. What is the difference between bevel-helical, foot-mounted helical and parallel-shaft gearboxes?
3. Should I buy the gearbox together with the electric motor, or can I use my existing one?
4. Does a worm gearbox hold the load by itself, can it replace a brake?
5. How do I choose the gearbox ratio?
6. What happens to the output speed if I fit a 1,000 rpm electric motor to the same gearbox?
7. What can be done if the output speed I need does not match the standard ratios?
8. How do I find the gearbox ratio from a conveyor belt speed?
9. How is gearbox output torque calculated?
10. What is the service factor of a gearbox and why does it matter?
11. What electric motor power can be fitted to a gearbox?
12. Is it a problem to fit a more powerful electric motor to a gearbox?
13. Why might two gearboxes with the same output speed not be interchangeable?
14. How do I check the IEC flange match between electric motor and gearbox?
15. What do radial and axial load mean on a gearbox?
16. Why does the mounting position affect the gearbox oil level?
17. When are a hollow-shaft gearbox and a torque arm used?
18. What oil goes into a gearbox, and when should it be changed?
19. What should be checked if a gearbox is leaking oil?
20. Why is my gearbox noisy?
21. Why does a gearbox get hot, and when is it a problem?

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