DID 60 standard roller chain - Big Bike Webshop

Roller Chains for Power Transmission Designing of Chain Transmission
Roller Chains for
Power Transmission
1. The description in this chapter can be applied when a
chain is endlessly engaged
for transmission with two
sprockets parallel in their
shafts and accurate in
alignment as illustrated
below.
Drive
Driven
Top
End
2. Consult us when a chain is to be used for lifting, pulling
dollies or being engaged with a pin gear, etc.
3. When there are any regulations or guidelines concerning
the selection of chains, select a chain in accordance
with such regulations and the maximum kilowatt ratings
(Drive performance) table described below, and choose
the one with a larger allowance.
Designing of Chain
Transmission
How to Select the Proper Chain
The chain can be selected according to the following two
methods:
(1) Selection by drive performance
(2) Low-speed selection
The drive performance method considers not only chain
tension but also the shock load on the bushings and rollers
due to the engagement between the sprockets and the
chain, and the wear of pins, bushings and rollers.
The slow-speed method is applied when the chain is
operated at a speed of 50 rpm or less. In general, the chain
selected by this method is subject to conditions more
severe than that selected according to the selection by
drive performance. Thus, carefully assess the conditions
when selecting with this method.
Selection by drive performance
First, the following information is required.
qPower to be transmitted (kW)
wSpeeds of driving shaft and driven shaft (speed ratio)
and shaft diameters
eCenter distance between driving shaft and driven shaft
(a) Correction of power to be transmitted (kW)
Correction must be made to obtain the actual power to be
transmitted as the level of load fluctuates depending on
the machine and power source used, affecting the
expected service life (for example, 15,000 hours in the
case of capacities shown in the table of maximum
kilowatt ratings). The service factor shown in Table 1 is an
indicator of the load level. The power to be transmitted
(kW) is multiplied by the corresponding service factor to
obtain a corrected power.
Corrected power (kW)
Power to be transmitted (kW) Service factor
(b) Selection of chain size and the number of
teeth of small sprocket
Use of simple selection chart
The number of teeth of small sprocket and the chain to
be used are tentatively decided with reference to the
simple selection chart (P122~P123) and the corrected
power (P120~P121).
Using the table of maximum kilowatt ratings
If the results tentatively decided as described above are
close to the design values, the number of teeth of small
sprocket can be finalized with reference to the table of
maximum kilowatt ratings. The maximum kilowatt ratings
are established anticipating that an endless chain with 100
links has a life of 15,000 hours under the following
conditions. (That is, the breaking of the chain and the loss
of bushings and rollers do not occur at a wear elongation
of 2 percent or less.)
qOperation is carried out in ambient temperature (-10°C~
+60°C) free from dust and dust-containing liquid.
wThere is no corrosive gas, or humidity, etc. to adversely
affect the chain.
eProper lubrication is maintained.
rThe chain is used under conditions of a low start-stop
frequency and a fairly stable load.
In the case of multiplex chain
Select a multiplex chain when the capacity of a simplex
chain is insufficient. The maximum kilowatt rating of a
multiplex chain cannot be obtained by multiplying the
maximum kilowatt rating of a simplex chain by the
number of multiplex chain since the loads are not
evenly distributed between the strands. For the
correction factor in this case, see the multiplex chain
factor table. Our standard HI-PWR-S Roller Chains and
HI-PWR-SHK Roller Chains are available up to triplex.
Table 1. Service factor
Type of input power Electric Inner combustion engine
motor or With multiple cylinders Without multiple cylinders
Type of load
turbine or hydraulic drive nor hydraulic drive
Smooth (agitator, centrifugal blower,
1.0 1.0 1.2
feeder, textile machines, etc.)
Moderate shock (general work machines,
compressors, machining tools, dryers, etc.)
Large shock (presses, civil engineering
or mining machines, vibration machines,
machines with reverse impact, etc.)
1.3
1.5
1.2
1.4
1.4
1.7
Table 2. Multiplex chain factor
Number of roller chain stand
2
3
4
5
Multiplex chain factor
1.7
2.5
3.3
3.9
kW rating of multiplex chain
kW rating of simplex chain multiplex chain factor
120