Chapter 10 Design and Precautions on assembly
18
10-2 Tolerable load of input shaft of double-shaft unit type
(1U)
The input part of the double-shaft unit type is supported by two single row deep groove bearings. Check
the load applied to the input part to ensure that the performance of the double-shaft unit type is fully
demonstrated.
The following diagram illustrates the fulcrums of the bearings. Dimensions “a” and “b” are shown in the
following table. The following graph shows the relationship between the tolerable maximum radial load
and axial load of Model No. 3. The values in the graph are those when the average input rpm is
2,000r/min and basic rated life of L10 = 7,000h.
Example: The maximum tolerable radial load (Fr) will be 3.75N when an axial load (Fa) of 3N is applied
to the input shaft.
Specification of bearings in input part
Bearing A
Bearing B
Model No.
Basic dynamic
rated load
Cr(N)
Basic static
rated load
Cor(N)
Model
No.
Basic dynamic
rated load
Cr(N)
Basic static
rated load
Cor(N)
Maximum radial
load
Fr(N)
MF63T12ZZ 242
94 681X 102
29
6
Bearing fulcrums
Relationship between axial load (Fa) and tolerable maximum radial load (Fr)
0
2
4
6
8
10
0
1
2
3
4
5
アキシャル荷重Fa(N)
ラジアル荷重Fr(N）
Axial load Fa(N)
R
a
d
ia
l l
oa
d
Fr
(N
)
Bearing A
Bearing B
Fa: axial load(N)
Fr: radial load(N)
