Service life

The life of the coupling is influenced by many factors, which vary according to the style of construction. One which above all affects couplings with rubber elements is the surrounding envi­ronment. The service life of a gear coupling is largely depend­ent upon regular lubrication using the correct type of lubricant according to the ambient temperature, etc. Flexible spring cou­plings are available with special grease which lasts five years, require almost no routine maintenance, and have no effects on the environment. Alignment affects the service life of all couplings irrespective of type or manufacturer.

For certain types of installations it can be desirable to use a cou­pling that allows a certain amount of emergency drive even in the event of failure of the flexible element. For other installa-

Inclination* mm per 100 mm measured length

100-x

L=

TJ

O

Measuring device and location

Shaft coupling type

Service life

Parallel

Misalignment

Mm

 

Zero setting and notation rules"

 

Remarks

 

Straight edge

 

Short shaft coupling. Machined outer diameter.

Machined on insides

 

Service life

Make due allowance for bearing end float in the machines.

 

Misalignment according to the figure is positive i. e. the difference is measured above on the motor side.

 

Measured

Directly

As

Dimension y

 

Feeler gauge

 

Service life

100 x

L=

100-X

L=

Radially measured value r

 

Make due allowance for bearing end float in the machines. (Zero set the dial indicator underneath if the pointer is resting on the pump half.)

 

Short shaft coupling Requires at least a good surface at measuring pointer. Machined on insides

 

For vertical location zero set the dial above. Measured value is read after rotating one half turn.

 

Service life

V=-5-

 

Feeler

Gauge

 

For vertical location zero set both dial indicators in the position shown, i. e. for radial deviation above and axial deviation underneath.

The dials are read after rotating one half turn

 

Make due allowance for bearing end float in the machines. If both dial gauges are placed with their pointers on the pump half, then zero setting should be carried out from underneath.

 

Radially measured value r

 

Short shaft coupling. Good surfaces at the measuring pointers

 

Service life

Y=ir

 

Service life Service life

N. B.

Measurement can also be carried out on "smooth" shaft ends.

RM + rP _________

?C 100

Long shaft couplings, i. e. couplings with a distance between the coupling halves. Good surfaces at the measuring pointers

IV

100

2 C

Radially measured

 

Service life
Service life

Zero set both dial gauges from above. The measurements rM and rP are read after rotating one half turn

 

Value

 

Value

 

Y=-

 

Coupling

Pin

 

Line C

 

Radially measured

 

Similar to method IV. Notice the position of the reference lines for calculating angular misalignment.

 

Long shaft couplings, i. e. couplings with distance between the coupling halves. Good surfaces at the measuring pointers

 

‘M

~2~

 

Zero set both dial gauges from above. The measurements rM and rp are read after rotating one half turn.

 

Vali

 

Value

 

Service life

Coupling

Pin

 

Service life Service life

Tions it may be necessary to use a limited torque coupling with overload protection.

It is important to carry out regular service and alignment checks according to the manufacturer’s instructions, and equally im­portant that these instructions are placed in the hands of the personnel concerned. Unfortunately methods or regulations for assessing the degree of wear are often lacking.

Posted in Fans Ventilation A Practical Guide


Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *