Program 2011/2012 - maxon motor - #30

maxon gear

Technology - short and to the point

Gears

If mechanical power is required at a high torque

and correspondingly reduced speed, a maxon

precision gear is recommended. According to

the gear ratio the output speed is reduced while

the output torque is enhanced. Fora more

precise determination of the latter, efficiency

must be taken into consideration.

Program

- Planetary gearhead

- Spur gearhead

- Koaxdrive

- Spindle drives

O Output shaft

0 Mounting flange

© Bearing of the output shaft

O Axial security

© Intermediate plate

©

©

©

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Cogwheel

Motor pinio

Planetary gearwheel

Sun gearwheel

Planet carrier

Internal gear

Spur gearhead

The gear consists of one or more stages. One

stage represents the pairing of two cogwheels.

The first cogwheel (pinion) is mounted directly

on the motor shaft. The bearing of the output

shaft is usually made of sintered material.

- Favorably priced

- For low torques

- Output torque up to 2 Nm

- Reduction ratios of 6:1 to 5752:1

- External - 012 - 45 mm

- Low noise level

- High efficiency

Planetary gearhead

Planetary gears are particularly suitable for the

transfer of high torques. Large gearheads are

normally fitted with ball bearings at gearhead

output.

Spur gearhead

- For transferring high torques up to 180 Nm

- Reduction ratios of 4:1 to 6285:1

- External diameter 6-81 mm

- High performance in a small space

- High reduction ratio in a small space

- Concentric gear input and output

Koaxdrive

The quiet "Koaxdrive" combines worm and

planetary gearing. In the first stage, a sepa-

rately mounted worm drives the three offset

planetary wheels which then mesh in the spe-

cially toothed internal geared wheel. All further

stages are designed as a normal planetary

gear:

- quiet

- high reduction ratio in the first stage

- other properties as planetary gears

Planetary gearhead

Conversion

The conversion of speed and torque of the gear

output (nB, MB) to the motor shaft (nmot, Mmot)

follows the following equations:

irjc

where:

I: reduction

ijo \ Gearhead efficiency

Selection of gears

As with motors, speed and torque limits also

apply to gearheads. Operating torque must

be below gearhead MNG nominal torque (max.

continuous torque).

MN, a > MB

With short-term loads, the intermittent torque of

the gear should also be taken into considera-

tion.

Note that the nominal torque (continuous

torque) of the gear is dependent on the number

of stages.

Where possible, the input speed of the gear

imax should not be exceeded. This limits the

maximum possible reduction imaxat a given

operating speed. The following applies to the

selection of the reduction /

If the gear is selected, the data conversed to

the motor axis (nmot, Mmot) are used to select the

motor. The maxon modular system defines the

proper motor-gear combinations.

30 Technology-short and to the point

May 2011 edition / subject to change