Technical Data Reducers Miter and Bevel Gear Boxes Selection
Miter Gear Box Selection example
Selection example 1
General selection
Layout used
Operating conditions
- ・Driven by induction motor (15 kW, 4P, 60 Hz) with a coupling for direct input from a lateral shaft.
- ・Install a P.C.D. 100 mm sprocket on the cross shaft side.
- ・Operate with a load transmission of 10 kW.
- ・Operating time is 10 hours per day with loads with moderate impact. Operation is intermittent, stopping 12 times an hour.
- ・Reduction ratio is 1:1.
Operating environments
- ・Indoors, constant 30°C, normal atmosphere (no dust or particles)
Options
- ・None (standard products only)
(1)Determine the service factor
Based on the operating conditions (loads with moderate impact, operating 10 hours per day with 12 stops per hour), the service factor is 1.50, referring to Table 1.
(2)Determine the design kW
Corrected kW = 10 kW (Load transmission kW) × 1.50 (service factor) = 15 kW The corrected kW is 15 kW.
(3)Determine a size
The size that satisfies a corrected kW of 15 kW and an input rotation speed of 1750 rpm is ED6M, referring to the transmission capacity table.
(4)Calculate the radial load
(Assuming that the radial load is applied to the center of the cross shaft )
Based on the chain transmission, the O.H.L factor (f) is 1.0 from Table 2, and the load position factor (Lf) is 1 due to the radial load being applied to the center of the shaft.
According to the radial load calculation formula and operating conditions:
The calculated radial load 1637 N is less than the ED6M cross shaft’s allowable radial load 2303 N, which means that the product is usable.
(5)Determination of model No.
Based on the shaft arrangement, rotation details, and mounting type of the layout, find the appropriate model.
ED6M-1-R-Y is selected. * Check the rotation direction.
Selection example 2
Line shaft drive
Layout used
Operating conditions
- ・Loads A, B, and C are all 245 N・m (uniform loads), and the operating time is 8 hours a day.
- ・Input rotation speed is 300 rpm, and the reduction ratio is all 1:1.
Operating environments
- ・Indoors, constant 30°C, normal atmosphere (no dust or particles)
Options
- ・None (standard products only)
* Precautions for selecting line shaft drive
The loads on the gear and line shaft (cross shaft) are different in the case of line shaft drives, for which models have to be selected individually.
Refer to the allowable torsional transmission capacity of only the cross shaft (allowable cross shaft torque).
(1)Determine the service factor
Based on the operating conditions (uniform loads, operating 8 hours a day), the service factor is 1.0, referring to Table 1.
(2)Select Miter Gear Boxes
1. Miter Gear Box No. 1
- ・Gear only drives load A. → Needs a transmission capacity of at least 245 N・m × 1.0 = 245 N・m.
- ・Cross shaft drives loads A, B, and C. → Needs a cross shaft torque of at least (245 N・m + 245 N・m + 245 N・m) × 1.0 = 735 N・m.
Therefore, ED10M is selected based on the transmission capacity table (see product page) and the allowable cross shaft torque.
[ED10M Transmission Capacity 513 N・m > 245 N・m, Allowable cross shaft torque 891 N・m > 735 N・m ]
2. Miter Gear Box No. 2
- ・Gear only drives load B. → Needs a transmission capacity of at least 245 N・m × 1.0 = 245 N・m.
- ・Cross shaft drives loads B and C. → Needs a cross shaft torque of at least (245 N・m + 245 N・m) × 1.0 = 490 N・m.
Therefore, ED8M is selected based on the transmission capacity table (see product page) and the allowable cross shaft torque.
[ED8M Transmission Capacity 331 N・m > 245 N・m, Allowable cross shaft torque 627 N・m > 490 N・m ]
3. Miter Gear Box No. 3
- ・Gear and cross shaft both drive only load C. → Needs a transmission capacity and cross shaft torque of at least 245 N・m × 1.0 = 245 N・m.
Therefore, ED8M is selected based on the transmission capacity table (see product page) and the allowable cross shaft torque.
[ED8M Transmission Capacity 331 N・m > 245 N・m, Allowable cross shaft torque 627 N・m > 245 N・m ]
(3)Find the model
Based on the shaft arrangement, rotation details, and mounting type of the layout, find the appropriate model.
No.1 ED10M-1-LR-O-Y, No.2 ED8M-1-LR-O-Y and No.3 ED8M-1-R-O-Y are suitable.
* Check the rotation direction.
