1) The document presents the design of a driving unit, including layout calculations for shafts SE1 and SE2, selection of machine elements, and assembly drawings. 2) Layout calculations determine the minimum diameters and torsion moments for shafts SE1 and SE2. 3) Machine elements selected include bearings, seals, nuts, washers, and keys that meet the dimensional requirements for shafts SE1 and SE2.

1. 4th Exercise Engineering Design
Group 3 : Nguyen Quang Thanh ID: 1558
Truong Thi Xuan Dao ID: 1538
Nguyen Thi Hong Nhung ID: 1533
Lecturer: Prof. Dr.-Ing. Michael Schmidt-Kretschmer
23 Mar 2014
Embodiment Design of a
Driving Unit

3. Table of content
Part 1: Layout calculation
Part 2: Select the machine element
Part 3: Assembly drawing

4. Part 1: Layout calculation
Part 2: Select the machine element
Part 3: Assembly drawing

5. Layout calculation for shaft SE2
Data Power P2= 10 kW Speed n2= 750
Permissible torsion
stress = 45 N/mm2
Determinati
on of the
torsion
moments
Minimum
diameter of
shaft SE2
(mm)
)(3.127
750
10
9550
(
)(
9550
)(.
)(.30
)1min1min2
2
2
2
2 Nmx
n
kWP
x
n
WP
Tt 

)(3.24
4514.3
10003.12716
.
.16 33
2
2
mm
x
xxT
d
perm
t



6. Layout calculation for shaft SE2
Data
Numbers of tooth
for gear1 z1 = 19
Numbers of tooth
for gear2 z2 = 61
Assumed that the
efficiency of
power
transmission is
90%, then the
power to SE1
P1 = 90 P2 = 0.9 x 10 = 9 (kW)
Gear ratio
The rotation
speed of shaft SE1
Determination of
the torsion
moments
Minimum diameter
of shaft SE1 (mm)
19
61
1
2
12 
z
z
n
19
61
x750=n×n=n 21 12
)(7.35
60750
199
9550
(
)(
9550
)(.
)(.30
)1min1min 1
1
1
1
1 Nm
x
x
x
n
kWP
x
n
WP
Tt 

)(9.15
4514.3
10007.3516
.
.16 33
1
1
mm
x
xxT
d
perm
t



7. Part 1: Layout calculation
Part 2: Select the machine element
Part 3: Assembly drawing

8. Select the machine element for SE1 (1/5)
Bearing
Principal
Dimensions (mm)
Basic load (kN)
Speed ratings
(r/min)
Designation
d D B
Dynamic
(C0)
Static
(C)
Ref
speed
Limiting
speed
SKF Explorer
bearing
30 62 17.25 40.2 44 8,500 11,000 30,206 J2/Q
http://www.skf.com/ca/en/products/bearings-units-housings/
roller-bearings/tapered-roller-bearings/single-row-tapered-roller-bearings

9. Select the machine element for SE1 (2/5)
Lip seal
Shaft Diameter
A (mm)
Housing
Diameter B(mm)
Housing Depth C
(mm)
JW part
Non
JW order
code
25 47 10 57-25 WG-030255
http://www.jameswalker.biz/product_range/68-Walkersele-radial-lip-
seals-general-range

10. Select the machine element for SE1 (3/5)
Slotted
nut Article ID Material
Number
of slots
T
(mm)
h(h14)
(mm)
BEN
d2(h11)
(mm)
P
(mm)
D
Left 11572160150 Steel 4 2 7 5 32 1.5 M16
Right 11572260150 Steel 4 3 10 7 45 1.5 M26
http://www.fabory.us/en/product.html

11. Select the machine element for SE1 (4/5)
Lock
washer Type
Weight Dimensions (mm)
Nut
[kg] d D D2 E F s B
Left MB 4 3,50 20 36 26 4 18,5 1,0 4 KM 4
Right MB 6 7,80 30 49 38 5 27,5 1,25 5 KM 6
http://www.marylandmetrics.com/pt1/mbwashr3.htm

12. Select the machine element for SE1 (5/5)
Nominal
diameter
of shaft (d)
Key way Key dimension
Width
(b)
Shaft t1 Hub t2
Width (b) x
thick (h)
Chamfer S
Length
Min Max
22 8 4 3.3 8 x 7 0.25 0.4 18
http://www.roymech.co.uk/Useful_Tables/Keyways/keyways.htm

13. Select the machine element for SE2 (1/4)
Bearing
Principal
Dimensions (mm)
Basic load (kN)
Speed ratings
(r/min)
Designation
d D B
Dynamic
(C0)
Static
(C)
Ref
speed
Limiting
speed
SKF Explorer
bearing
40 62 12 13.8 10 24,000 12,000 61908-2RZ
http://www.skf.com/group/products/bearings-units-housings/ball-bearings/
deep-groove-ball-bearings/single-row/

14. Select the machine element for SE2 (2/4)
Slotted
nut
Article ID Material
Number
of slots
T
(mm)
h(h14)
(mm)
BEN
d2(h11)
(mm)
P
(mm)
D
11572500150 Steel 6 3.5 13 8 75 1.5 M50
http://www.fabory.us/en/product.html

15. Select the machine element for SE2 (3/4)
Lock
washer
Type
Weight Dimensions (mm)
Nut
[kg] d D D2 E F s B
MB 11 19,60 55 81 67 8 52,5 1,25 7 KM 11
http://www.marylandmetrics.com/pt1/mbwashr3.htm

16. Select the machine element for SE2 (4/4)
Nominal
diameter
of shaft (d)
Key way (mm) Key dimension (mm)
Width
(b)
Shaft t1 Hub t2
Width (b)
x thick
(h)
Chamfer S Length
(mm)
Min Max
30 10 5 3.3 10 x 8 0.4 0.6 22
50 16 6 4.3 16 x 10 0.4 0.6 45
http://www.roymech.co.uk/Useful_Tables/Keyways/keyways.htm

17. Part 1: Layout calculation
Part 2: Select the machine element
Part 3: Assembly drawing

18. Front-view

19. Front-view – SE1

20. Front-view – SE1

21. Thank!