Level D Mills and Kilns – 2/5

Welcome to your Level D Mills and Kilns, 2 of 5

1. What is the difference between an Open Gear and a gearbox?

An Open Gear has no gear guard

An Open Gear is always a multiple-stage gear

An Open Gear always has a transmission ratio of 1:4

The pinion(s) of an Open Gear can be adjusted in all 3 directions

2. Where is the loose pinion bearing of an Open Gear usually located?

Not defined, may be on the coupling or on the shaft side

Open Gears do not have any loose bearings

Opposite the coupling side / non-drive side

The loose bearing is the bearing closest to the coupling

3. Which types of teething are used in Open Gears?

Hypoid, bevel

Worm, bevel

Helical, spur, herringbone

Worm, helical, bevel

4. What is the difference between run-in and run-out pinion?

The force resulting from the run-in pinion is transmitted to the foundation, and the force resulting from the run-out pinion pulls at the anchor bolts of the pinion bearings.

The force resulting from the run-out pinion is transmitted to the foundation, and the force resulting from the run-in pinion pulls at the anchor bolts of the pinion bearings.

The directions of rotation of run-in and run-out pinion are opposite.

The run-out pinion has a higher number of teeth.

5. Which type(s) of mill drive system is usually lubricated with CLP gear oil?

Single-pinion mill drive with a spray system

Double-pinion mill drive with a spray system

Central drive, lateral drive with slide shoes or COMBIFLEX drive

None of the above

6. What is the description for a self-aligning pinion?

Pinion can be manually adjusted during running

Is totally fixed

A self-aligning pinion runs on a pinion shaft that is movable in longitudinal direction

Always has herringbone toothing

7. What is the perfect lubricant for the ROTAX drive?

CEPLATTYN GT 10

GEARMASTER CLP 320

Friction drives must not be lubricated

Grease according to DIN 81502 / KPF 2 N-20

8. Why are spring plates often installed on a kiln drive?

To achieve smooth running

Easy to assembly

Due to the considerably lower heat transfer

Due to the better axial runout properties

9. Why are the back gear bearings of mills often plain bearings?

Due to the low lubricant requirements

Easy to assemble

For cost reasons

Because they are not as susceptible to shocks and as roller bearings

10. What are the advantages of a ThyssenKrupp POLYGLIDE?

Reduced lubricant requirement

True running deviations of the girth gear are eliminated during meshing

Low price due to the compact design

The drive power can be significantly reduced

11. What are the advantages of a ThyssenKrupp POLYGLIDE and a CMD BOGIFLEX drive?

Reduced lubricant requirement

Pinion follows every movement of the girth gear

Because of the compact design, the price is low

The drive power can be significantly reduced

12. Which advantage do helical drives have versus spur drives?

Usually smoother running

Better adjustment of the tooth root clearance

Lower manufacturing costs

Better transmission of the vibrations to the foundation

13. Why is there a free-end and a fixed-end bearing?

This arrangement prevents thermal longitudinal expansion of the shaft.

This arrangement can compensate the manufacturing tolerances of a bearing.

Loose and fixed bearing have a different bearing clearance in order to improve the deflection of vibrations produced.

This arrangement allows thermal longitudinal expansion of the shaft.

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