Embodiment design of a driving unit

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

Table of content

Part 1: Layout calculation

Part 2: Select the machine element

Part 3: Assembly drawing

Part 1: Layout calculation

Part 2: Select the machine element

Part 3: Assembly drawing

Layout calculation for shaft SE2

Data Power P2= 10 kW Speed n2= 750 Permissible torsion stress = 45 N/mm2

Determination of the torsion moments

Minimum diameter of shaft SE2 (mm)

)(3.127750

109550

(

)(9550

)(.

)(.30

)1min1min2

2

2

2

2 Nmxn

kWPx

n

WPTt

)(3.244514.3

10003.12716

.

.1633

2

2

mmx

xxTd

perm

t

Layout calculation for shaft SE2

DataNumbers of tooth for gear1 z1 = 19 

Numbers of toothfor 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

zn

19

61 x 750=n×n =n 21 12

)(7.3560750

1999550

(

)(9550

)(.

)(.30

)1min1min 1

1

1

1

1 Nmx

xx

n

kWPx

n

WPTt

)(9.154514.3

10007.3516

.

.1633

1

1

mmx

xxTd

perm

t

Part 1: Layout calculation

Part 2: Select the machine element

Part 3: Assembly drawing

Select the machine element for SE1 (1/5)

Bearing

Principal Dimensions (mm)

Basic load (kN)Speed ratings

(r/min)Designation

d D BDynamic

(C0)Static

(C)Ref

speedLimiting 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

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

Select the machine element for SE1 (3/5)

Slotted nut Article ID Material

Number of slots

T(mm)

h(h14)(mm)

BENd2(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

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

Select the machine element for SE1 (5/5)

Nominal diameter of

shaft (d)

Key way Key dimension

Width (b)

Shaft t1 Hub t2Width (b) x

thick (h)

Chamfer S

LengthMin Max

22 8 4 3.3 8 x 7 0.25 0.4 18

http://www.roymech.co.uk/Useful_Tables/Keyways/keyways.htm

Select the machine element for SE2 (1/4)

Bearing

Principal Dimensions (mm)

Basic load (kN)Speed ratings

(r/min)Designation

d D BDynamic

(C0)Static

(C)Ref

speedLimiting 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/

Select the machine element for SE2 (2/4)

Slotted nut

Article ID MaterialNumber of slots

T(mm)

h(h14)(mm)

BENd2(h11)

(mm)P

(mm) D

11572500150 Steel 6 3.5 13 8 75 1.5 M50

http://www.fabory.us/en/product.html

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

Select the machine element for SE2 (4/4)

Nominal diameter

of shaft (d)

Key way (mm) Key dimension (mm)

Width (b)

Shaft t1 Hub t2Width (b)

x thick (h)

Chamfer SLength(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

Part 1: Layout calculation

Part 2: Select the machine element

Part 3: Assembly drawing

Front-view

Front-view – SE1

Front-view – SE1

Thank!