Permissible shaft loads
To preclude mechanical overloading of the shaft and bearing, the overload capacity of the shaft end shall be limited to permissible values.
To quickly select a motor and estimate loads, a simplified load model shall be established (see Fig. 1). Here, the radial load, the axial load, and the distance of the load application point from the front side of the motor are the parameters that the user shall verify when selecting a motor.
For every motor size, a fixed axial load limit shall be pre-defined and the associated radial load limits as a function of the effective distance "a" shall be indicated. The catalog provides the values for the loads on the shaft end (a=L) or on half the mounting length (a=L/2). The information provided applies only for the indicated lengths. If loads engage beyond the shaft end, we recommend that our engineering department perform a separate test.
Fig. 1: Simplified load model. Fa = axial load, Fr = radial load.
Scope
- The radial loads provided in the table are permissible during continuous duty and incorporate at least twice the safety factor against the shaft's fatigue fracture.
- All figures apply only for the shaft ends indicated in the table or motor spec sheets.
- The load application point must be within the mounting range on the shaft.
- Permissible loads are calculated for an extended service life of 15,000 operating hours of the bearing according to DIN ISO 281.
- The weight of the parts that the customer mounts on the shaft are not taken into consideration. For heavier weights, a separate test is advisable to avoid problems with the critical bending frequencies.
- The figures are calculated values and not a binding statement in the sense of guaranteed characteristics.
- The calculation is based on the installation position on Model B3.
Basic recommendations
Tools or other customer components to be installed on the shaft must, at a minimum, meet a balance quality of G6.3 according to DIN ISO 1940-1. In special situations (large tool weight, high speeds), a balance quality of G2.5 or better may be necessary.
The load application point on the shaft should lie as close as possible to the motor since the load carrying capability is highest here. In practice, this means that tools or other components to be mounted by the customer should be clamped on the shaft as close as possible to the motor. In the design phase, this should be considered as early as possible.
| Type | Drawing | Shaft end | Permissible radial load | Axial load | Valid up to n | |
| F_per_(a=L) | F_per_(a=0,5L) | Fa | n = | |||
| KN 21.05 | MS 151 | ø14x30 PF | 450 N | 500 N | 200 N | 18,000 rpm |
| KN 22.08 | MS 151 | ø14x30 PF | 350 N | 550 N | 200 N | 18,000 rpm |
| KN 23.10 | MS 151 | ø14x30 PF | 300 N | 400 N | 200 N | 18,000 rpm |
| V 30.06 | MS 132 | ø14x30 PF | 500 N | 550 N | 200 N | 18,000 rpm |
| V 31.09 | MS 132 | ø14x30 PF | 500 N | 550 N | 200 N | 18,000 rpm |
| KR 35.1 | MS 3746 | ø14x30 PF | 550 N | 850 N | 300 N | 18,000 rpm |
| KR 35.3 | MS 3746 | ø14x30 PF | 550 N | 850 N | 300 N | 18,000 rpm |
| KR 35.5 | MS 3746 | ø14x30 PF | 550 N | 900 N | 300 N | 18,000 rpm |
| KR 35.7 | MS 3746 | ø14x30 PF | 550 N | 900 N | 300 N | 18,000 rpm |
| KR 35.9 | MS 3746 | ø14x30 PF | 600 N | 900 N | 300 N | 12,000 rpm |
| KR 35.1 D | MS 3772 | ø25x50 PF | 1100 N | 1200 N | 300 N | 18,000 rpm |
| KR 35.3 D | MS 3772 | ø25x50 PF | 1000 N | 1200 N | 300 N | 18,000 rpm |
| KR 35.5 D | MS 3772 | ø25x50 PF | 750 N | 1200 N | 300 N | 18,000 rpm |
| KR 35.7 D | MS 3772 | ø25x50 PF | 650 N | 1000 N | 300 N | 18,000 rpm |
| KR 35.9 D | MS 3772 | ø25x50 PF | 500 N | 800 N | 300 N | 12,000 rpm |
| V 50.09 | MS 113 A | ø22x50 PF | 900 N | 1000 N | 300 N | 18,000 rpm |
| KN 50.11 | MS 170A | ø22x50 PF | 1100 N | 1500 N | 300 N | 12,000 rpm |
| KN 51.14 | MS 170A | ø22x50 PF | 850 N | 1400 N | 300 N | 12,000 rpm |
| KN 52.16 | MS 170A | ø22x50 PF | 750 N | 1200 N | 300 N | 12,000 rpm |
| KN 50.11 D | MS 4046 | ø30x68 PF | 1100 N | 1700 N | 300 N | 12,000 rpm |
| KN 51.14 D | MS 4046 | ø30x68 PF | 950 N | 1600 N | 300 N | 12,000 rpm |
| KN 52.16 D | MS 4046 | ø30x68 PF | 850 N | 1400 N | 300 N | 12,000 rpm |
| V 60.11 | MS 113 B | ø22x50 PF | 750 N | 800 N | 400 N | 18,000 rpm |
| V 61.15 | MS 113 B | ø22x50 PF | 750 N | 850 N | 400 N | 18,000 rpm |
| KN 60.09 | MS 170B | ø24x50 PF | 1100 N | 1200 N | 400 N | 12,000 rpm |
| KN 61.13 | MS 170B | ø24x50 PF | 1100 N | 1200 N | 400 N | 12,000 rpm |
| KN 62.18 | MS 170B | ø24x50 PF | 1200 N | 1300 N | 400 N | 12,000 rpm |
| KN 60.09 D | MS 171 | ø30x70 PF | 1300 N | 1900 N | 400 N | 12,000 rpm |
| KN 61.13 D | MS 171 | ø30x70 PF | 1300 N | 2000 N | 400 N | 12,000 rpm |
| KN 62.18 D | MS 171 | ø30x70 PF | 1300 N | 2000 N | 400 N | 12,000 rpm |
| KC 70.12 | MS 652-44 | ø35x68 PF | 2300 N | 2500 N | 600 N | 9,000 rpm |
| KC 71.16 | MS 652-44 | ø35x68 PF | 2400 N | 2600 N | 600 N | 9,000 rpm |
| KC 71.20 | MS 652-44 | ø35x68 PF | 2400 N | 2600 N | 600 N | 9,000 rpm |
| KC 72.28 | MS 652-44 | ø35x68 PF | 2500 N | 2700 N | 600 N | 9,000 rpm |
| KC 70.12 D | MS 182-5 | ø35x70 PF | 2400 N | 2600 N | 600 N | 9,000 rpm |
| KC 71.16 D | MS 182-5 | ø35x70 PF | 2500 N | 2800 N | 600 N | 9,000 rpm |
| KC 71.20 D | MS 182-5 | ø35x70 PF | 2500 N | 2800 N | 600 N | 9,000 rpm |
| KC 72.28 D | MS 182-5 | ø35x70 PF | 2500 N | 2800 N | 600 N | 9,000 rpm |
| K 81.23 | MS 630 A397 | ø30x81 Flansch | 2000 N | 2900 N | 800 N | 6,000 rpm |
| K 82.27 | MS 630 A397 | ø30x81 Flansch | 1900 N | 2700 N | 800 N | 6,000 rpm |
| K 83.37 | MS 630 A397 | ø30x81 Flansch | 1800 N | 2400 N | 800 N | 6,000 rpm |
| K 81.23 D | MS 630 A196 | ø40x70 PF | 2400 N | 2600 N | 800 N | 6,000 rpm |
| K 82.27 D | MS 630 A196 | ø40x70 PF | 2500 N | 2600 N | 800 N | 6,000 rpm |
| K 83.37 D | MS 630 A196 | ø40x70 PF | 2500 N | 2700 N | 800 N | 6,000 rpm |
| K 91.31 | MS 630 B130 | ø40x93 Flansch | 4100 N | 5000 N | 1000 N | 6,000 rpm |
| K 93.38 | MS 630 B130 | ø40x93 Flansch | 4000 N | 5100 N | 1000 N | 6,000 rpm |
| K 110.24 | MS 3954 | ø60x117 Flansch | 6400 N | 7700 N | 1500 N | 6,000 rpm |
| K 111.31 | MS 3954 | ø60x117 Flansch | 6000 N | 7900 N | 1500 N | 6,000 rpm |
| K 112.38 | MS 3954 | ø60x117 Flansch | 4500 N | 8000 N | 1500 N | 6,000 rpm |
| K 113.50 | MS 3954 | ø60x117 Flansch | 4200 N | 8300 N | 1500 N | 6,000 rpm |
| K 140.38 | MS 630 D62 | ø80x140 Flansch | 11600 N | 12200 N | 2500 N | 5,000 rpm |
| K 141.50 | MS 630 D62 | ø80x140 Flansch | 12000 N | 12500 N | 2500 N | 5,000 rpm |
| K 160.50 D | MS 3503 | ø90x200 PF | 13200 N | 14200 N | 4000 N | 4,500 rpm |
| K 162.60 D | MS 3503 | ø90x200 PF | 13500 N | 14400 N | 4000 N | 4,500 rpm |
| K 200.50 D | MS 4452 | ø95x210 PF | 13200 N | 14200 N | 4000 N | 4,500 rpm |
| K 202.60 D | MS 4452 | ø95x210 PF | 13400 N | 14400 N | 4000 N | 4,500 rpm |