KHK Technical Information

Selection Examples
■Essential data for selection
Load torque, type of prime mover, input speed, speed ratio, yunning time, coupling method, and frequency of start and stop.
 
■Selection Procedure
The performance table in the catalog is based on the design conditions that the prime mover is a motor, the load is uniform, and the unit runs 10 hours per day.
When using the unit under any other condition, it is necessary to correct the value of load to torque by applying the service factors shown in Table 1.
Corrected Load Torque = Load torquebapplied to gearbox × Service factor (See Table 2)
Service factors

NOTE1】 Use the factors in parentheses when frequency of starts and stops exced 10 times per hour.
NOTE2】 Also, use the factors in parentheses

Keep the corrected load torque at the speed at less than the allowed X & Y axis torque (Speed ratio 1:1), or the allowable Y torque (Speed ratio 1:2) shown in the performance table.
Select an appropriate shaft layout from the shaft layout drawing for each model
check for overhang load space
Overhang load is a load applied beyound the bearing support. Examining the overhang load is indispensable whenever chains, belts, or gears are used to used to couple the unit with the mating machinery.
TLECorrected load torque applied to the gearbox shaft
(N・m) {kgf・m}
RPitch redius of sprocket, pulley, gear, ect., mounted on the gearsbox shaft (m)
K1Factor depending on the method of coupling (See Table -3)
K2Factor depending on the position of load (See Table -4)
※The value of O.H.L. from the equation above must be smaller then value of allowable O.H.L. on the X -axis and Y -axis shown on peerformance table.
Factor K1 (Table - 3)
Factor K2 (Table - 4)
●Position of load
Select a model capable to satisft all of , and obtained above.
 
■Example 1
ApplicationConveyor
Load torque4.9N・m {0.5kgf・m}(uniform load)
X -axis rotational speed300rpm
Speed ratio1 : 2
Shaft layoutas shown on the figure below
Running time12 hours/day
Coupling methodX -axis--coupling
Y -axis--Chain (positioned at the middle of the shaft)
InstallationHorizontal
LocationIndoors
Torque Analysis
Service factor under load is Sf=1.25 (Table -2)
Accordingly, corrected load torque applied to Y -axis.
TLE=4.9×1.25=6.13N・m  {TLE=0.5×1.25=0.625kgf・m}
O.H.L. Analysis
O.H.L. on the Y -axis
Model Selection
A model capable of satisfying of the design conditions, torque and O.H.L. is KBX -152L .
 
■Example 2
ApplicationLine shaft drive
Load torque3.9 N.m {0.4kgf.m} (uniform load) (for each A, B and C)
rotational speed600rpm
Speed ratio1 : 1
Shaft layoutas shown on the figure below
Running time 8 hours/day hours/day
Coupling methodAll couplings
InstallationHorizontal
LocationIndoors
In case of an inline shaft drive, load applied to the Y -axis varies with the location of the gearbox. Theerefore an adequate model must be selected individually for each position. Service factor (Table -2) under the design condition is Sf=1.0 for all gearboxes.
No.1 gearbox
Corrected load torque applied to the X -axis that drivers only load A is :
3.9×1.0=3.9N・m {0.4×1.0=0.4kgf・m}
Corrected load torque applied to the Y -axis that drivers only load A ,B and C is :
(3.9+3.9+3.9)×1.0=11.7N・m
{(0.4+0.4+0.4)×1.0=1.2kgf・m}
KBX-201T is selected from the performance table.
No.2 gearbox
Corrected load torque applied to the X -axis that drivers only load B is :
3.9×1.0=3.9N・m {0.4×1.0=0.4kgf・m}
Corrected load torque applied to the Y -axis that drivers only load B and C is :
(3.9+3.9)×1.0=7.8N・m
{(0.4+0.4)×1.0=0.8kgf・m}
KBX-151T is selected from the performance table.
No.3 gearbox
Corrected load torque applied to the X -axis that drivers only load C is :
3.9×1.0=3.9N・m {0.4×1.0=0.4kgf・m}
Corrected load torque applied to the Y -axis that drivers only load C is :
3.9×1.0=3.9N・m {0.4×1.0=0.4kgf・m}
KBX-151L is selected from the performance table.
Model Selection
No.1 gearbox is KBX-201T .
No.2 gearbox is KBX-151T .
No.3 gearbox is KBX-151L .


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