Voith-hirth-couplings.pdf

September 15, 2017 | Author: Sandeep Gupta | Category: Screw, Mechanical Engineering, Manufactured Goods, Machines, Technology
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Short Description

Hirth coupling...

Description

Voith Hirth couplings, standard and custom-made toothed rings Positive locking

Accurate in

Accurate in

indexing

repetition

Fa Fu

The original

Benefits

All the world‘s our home

Invented decades ago but still up to date, the original Hirth couplings from Voith Turbo meet the complex requirements of modern engineering:  lightweight design  high strength connections We offer a complete range of services to meet almost any requirements:  Standard rings  Toothed rings to customer specifications  Serrations on customer components Voith standard rings act as a compact indexing element that achieve high indexing accuracy and as a positioning element with high repeat accuracy.

Voith Turbo offers a broad range of standard rings:  Diameter 50 – 900 mm, number of teeth 12 – 720  Transmittable torque 340 – 98,600 Nm

Voith Hirth couplings have proven their worth more than 100,000 times over in all of the major international markets.

For our customers, this means:  Short delivery times and low logistics costs, almost all standard rings are available from stock  Excellent purchase prices due to large scale manufacturing  Guaranteed long-term replacement, as versions remain unchanged for decades

Applications for standard rings include:  Machine tools (particularly rotary indexing tables, turret heads and pallet changers)  Turbo compressors  Metrology  Robotics  Nuclear technology  Medical technology  General engineering

Our experience – your advantage

Features of Voith Hirth serrations

Advantages

 Angular surfaces provide positive locking transmission of most of the peripheral force

 High torque capacity  The bolts only have to absorb a small axial force

 High load-bearing percentage on tooth flanks

 High wear resistance  Indexing accuracy ± 2”

 Multiple wedge effect

 Repeat accuracy _< 0.001 mm

 Optimized geometrical shape of teeth

 Self-centering  Low axial and concentric run-out

 Hardened serration

 Long service life

Standard rings - Technical data Ring size N5 N 10 N 12 N 16 N 20 N 25 N 28 N 32 N 36 N 40 N 45 N 50 N 56 N 63 N 71 N 80 N 90

2

Outer diameter of dimension D [mm] 50 100 125 160 200 250 280 320 360 400 450 500 560 630 710 800 900

Inner diameter of dimension d [mm] 20 60 85 120 150 200 230 260 300 340 350 400 450 520 590 670 760

Maximum transmittable torque Tmax [Nm] 340 940 1,700 2,260 3,720 6,460 7,320 8,330 15,000 16,800 25,500 28,800 46,700 53,500 60,300 87,500 98,600

Requirements

 No safety allowance  Fully tightened bolts, material class 10.9 in compliance with ISO 898-1  Hardened locating pins with solid cross-section in compliance with ISO 8734 Note

Higher torques can be transmitted with custom-made rings.

Standard rings - Dimensions and part numbers

Tooth gap Fixing hole center

N 1 x 45°

45°

45°

° (= 360 2x

) 60° 0° (= 3 2 x 18

d H6

T

Q

R

Q

l±0.2

Fixing hole pattern L

S=F+F

Note

On all standard rings, the center of the tooth gap is identical to the center of the fixing hole for the bolts. This means that the fixing holes are offset by half a spacing when paired.

80° (= 360°)

G

. l± 0

2

2 x1

F±0.1

18°

Order example Ring size N 20

Number of teeth 96

36°

(= 360°) 6° x 3 0°(= 360°) 18 2x

M

°

10

54

h

(= 6 x 60° 360°) (= 360 °)

Fixing hole pattern K



IV AB

l±0.2 60 ° 30° 30° 18

O I B

D h6

M

U

2x

D-1 E = d+1

A

180

Fixing hole pattern J

P

O

II A

2 x 180° (= 360°)

°)

III AB

Part no. H15.093220

When ordering, always specify the ring size, number of teeth and part number.

3

Ring size

N5

N10

N12

N16

N20

N25

N28

N32

N36

øD

50

100

125

160

200

250

280

320

360

G

h

Number of teeth 12.1 6.08 12 24

U

3.5

11.2 2.72

2.5

10.7 1.78

1.4

H15.093040 60

U

G

h

U

17.3

5.8

4.6

G

h

U

G

h

U

4.3

19.5

5.9

4.1

G

h

U

G

h

U

G

h

U

G

h

400 U

G

h

10.4 1.2

0.9

H15.093050 72

14.5 5.91

4.2

H15.092040 14.5 4.81

4.0

H15.092010 14.1 3.82

3.5

H15.092020 13.6 2.69

2.3

H15.092030 13.7 2.74

2.4

H15.092050 96

H15.093140 16.7 4.34

3.6

H15.093110 16.

3.83

3.5

H15.093120 16.6 3.69

3.5

15.093.130 16.1 2.52

2.2

H15.093150 120

17.1 5.43

H15.092140 16.8

4.5

H15.093240

3.8

19.6

H15.092110 16.8 4.21

3.8

19.5 4.83

15.092.120 16.6 3.51

144

4.3 4.2

H15.093210

3.4

19.1 3.84

H15.092130 16.1 2.61

5.4

H15.093250

3.5

H15.093220

2.3

19.1 3.51

H15.092160

3.3

H15.093230 18.7 2.76

2.4

H15.093270 180

19.5 5.91

4.2

H15.092240 19.8 5.82

4.7

H15.092250 19.2 4.36

3.7

H15.092210 19.1 3.85

3.5

H15.092220 18.7 2.91

2.5

H15.092230 18.7 2.76

2.4

H15.092270

22.7 7.27

5.7

H15.093340 22.8 6.95

5.8

H15.093350 22.5 5.21

4.5

H15.093310 21.4 3.63

3.0

H15.093320 21.4 3.47

3.2

H15.093330 21.4 3.22

2.9

H15.093370

240

22.4 6.66

4.9

H15.092340 22.1 5.45

4.5

H15.092310 22.4 5.43

5.0

H15.092320 21.8 4.23

4.0

H15.092330 21.7 3.82

3.4

H15.092360 21.1 2.62

2.3

H15.092370 288

26.2 8.18

6.4

H15.093440 25.2 6.58

5.4

25.0 5.91

H15.093450 24.7

5.4

4.6

24.6 5.45

H15.093470 24.7 4.98

4.5

24.5 4.84

3.5

24.3 4.23

360

23.15 1.71

3.0

23.6 2.72

2.0

23.6 2.77

2.4

H15.092480

1.4

23.4 2.02

1.7

H15.092440

d

20

60

85

120

150

200

230

260

300

340

F

10

12.5

15

15

17.5

17.5

20

20

22.5

22.5

I

35

80

105

140

175

225

255

290

330

370

J

 





 









7.5

8.6

11.6

10.6

13.1

13.7

15

15.3

17.8

17.6

N

3

4.1

4.6

4.6

5.1

5.2

7.2

7.3

O

11

11

11

11

15

15

15

15

18

18

L

2.4

H15.092430

H15.093490

K

4.0

H15.092420

H15.093430 23.5 2.39

4.2

H15.092410

H15.093420 23.8 3.07

4.3

H15.092470

H15.093410 24.0 3.63

4.2

H15.092450

H15.093480

M

U

H15.093030 11.6 3.8

H15.093020 48

h

4.5

H15.093010 36

G

N40

9

P

7

7

7

7

9.5

9.5

9.5

9.5

11.5

11.5

Q

7

7

10

10

9.5

9.5

9.5

9.5

11.5

11.5

R

5

5

7

7

6.8

6.8

6.8

6.8

9

9

T

M6

M6

M6

M6

M8

M8

M8

M8

M8

M8

I/II/III

0.005

0.01

IV

0.01

0.02

Dimensions in mm



Available from stock Fixing hole pattern

4

Standard rings - Dimensions and part numbers

Tooth gap Fixing hole centre

N 1 x 45°

45° ° 15

30° 12

10°

F±0.1 G S=F+F

Note

On all standard rings, the center of the tooth gap is identical to the center of the fixing hole for the bolts. This means that the fixing holes are offset by half a spacing when paired.

5

l 30°

Fixing hole pattern K

18 x 20° (= 30° 36 20° 0°

T

)

d H6

h

IV AB

20° 20°

10°

R

O I B

d H6

P

O D-1 E

M

l

0°(= 360°)

U

Fixing hole pattern J

A

x3

II A

4 x 90°(= 360°

)

III AB

20° 20°

Order example Ring size N 20

Number of teeth 96

Part no. H15.093220

When ordering, always specify the ring size, number of teeth and part number.

Ring size

N45

N50

N56

N63

N71

N80

øD

450

500

560

630

710

800

Number of teeth

G

h

U

26.5

5.53

3.2

96 120

G

6.58

5.4

27

26.8

4.89

4.0

27.3

26.6

4.09

3.5

27.6

26.6

3.29

26.4

3.24

3.0

26.7

26

2.39

4.7

29.1

h

U

G

5.16

3.5

29.8

5.74

H15.092940 5.4

29.3

h

U

G

6.48

4.7

31.9

3.86

2.9

26.15

2.91

3.5

29.5

2.1

26.2

2.78

2.4

29

29.8

h

U

6.2

4

4.54 3.48

2.6

29

3.22

4.2

29.9

1.11

4.8

31.75

5.33

3.2

29.3

4.14

5.0

32.2

29.2

3.75

3.8

32.2

0.8

28

1.38 H15.092660

900

h

U

6.68

4.9

G

h

U

5.34

6.59

5.4

H15.092840 4.7

37.1

4.90

3.6

31.5

3.56

4.5

37

30.6

1.68 H15.092760

4.5

42.3

4.85

H15.097630 4.3

41.8

H15.092820 3.2

36.8

H15.092730 1.0

5.47 H15.092810

4.24

4.0

42.2

H15.092830 1.4

35.8

2.02

4.85 4.99

4.7

H15.097610 1.7

41

2.4

H15.092850

H15.097620

350

400

450

520

590

670

760

E

400

450

502

580

650

740

840

F

25

25

27.5

27.5

30

35

40

I

380 ± 0.2

430 ± 0.2

480 ± 0.5

550 ± 0.5

620 ± 0.5

710 ± 0.5

800 ± 0.5

J









 



M

20.8

20.2

24

23

25.5

31

35

N

9.8

9.2

11

10

12.5

18

22

O

18

18

20

20

20

20

20

P

11.5

11.5

14

14

14

14

14

R

9

9

11

11

11

11

11

T

M8

M8

M10

M10

M10

M10

M10

I/II/III

0.01

0.015

IV

0.02

0.03

Available from stock Fixing hole pattern

3.8

H15.097640

d

Dimensions in mm

6

37.4

H15.092720

H15.092630

H15.092960

3.5

H15.092710

H15.092620 3.2

5.32 H15.092750

H15.092610

H15.092930 27.85

5.91

K



G

H15.092740

H15.092650

H15.092920

H15.092530

720

3.7

H15.092910

H15.092560

H15.093580

4.85

H15.092640

H15.092950

H15.092520

H15.093570 360

5.83

H15.092510

H15.093530 288

4.2

H15.092550

H15.093520 240

5.92

G

H15.092540

H15.093510 180

U

H15.093540 27.7

H15.093560 144

h

N90

2.5

Toothed rings to customer specifications What if our standard rings are not right for your application? No problem! We can produce custom-made Hirth toothed rings for you. Needless to say, we will also support you in the design process and with the calculations for the Hirth serration. We have access to effective simulation tools for performing the calculations. Take advantage of this opportunity and benefit from our years of experience.

To produce custom-made rings, we require the following information:

L1

z3

   

d

␣’

    

h

h-s 2

D

Concentricity

Z1=z2+z3

␣’

Axial run-out

h-s 2

h



Number of teeth z Outer diameter of teeth D Inner diameter of teeth d Position of teeth in respect of any fixing holes, keyways etc. (e.g. tooth gap center to center of fixing hole) Assembly dimension Z1 of toothed parts Indication of prepared concentricity checking surface (diameter) and contact surface(s) [ ] Details of material and type of any treatment Machining and positional tolerance Surface quality of teeth

␣ z2

L1

d

Contact or alignment surfaces

7

Design and calculation information

Force diagram:

Fu Fa

30°

Fu Circumferential force Fa Axial force Fn Normal force

Fn

Calculation

 Hirth serrations are not calculated in the same way as involute toothing.  The transmitted torque T is proportional to the circumferential force Fu  The inclination of the tooth flanks results in an axial force Fa  When compressed together, the teeth support each other if the pre-load Fva is sufficient. This means that the teeth do not bend.  The varying loads on the tooth flanks result merely in a slightly irregular distribution of the pressure pre-load in the tooth root cross-section

The maximum surface pressure pmax is calculated as follows:

Here:

Fu =

4T D+d

Fva + Fa Az

and with the effective tooth flank area Fa = Fu· tan 30°  The axial force must be absorbed by pre-loading tensioning devices of adequate dimensions. These tensioning devices could be disk springs, hydraulic cylinders and, in special cases, bolts. The required pre-load Fva is: Fva = ␯·F a with the safety factor ␯ = 1.8 … 3.0

8

pmax =

(

Az = D – d –

·

n · dL2 D+d

)

␲ (D + d) – 1.155·z·(r + s) · ␩z 4

Section A-A øD ød

l

r

r

␣’

U

60°

r

h

H

s

A

A

Center Hirth serration

Geometry

The number of teeth z and the theoretical tooth height H depend on the outer tooth diameter D.

Symbols

with the following assignment: Number of teeth z

Factor c

12 24 36 48 60 72 96 120 144 180 240 288 360

0.234 0.114 0.075 0.056 0.045 0.037 0.028 0.022 0.018 0.015 0.011 0.009 0.007

720

0.003

Tooth root radius r

Crown clearance s

[mm] 0.3 0.6 1.0 1.6 2.5

[mm] 0.4 0.6 1.0 1.6 2.5

A reference value for the tooth length l is:

l=

D–d = b·D where b = 0.05 … 0.3 2

The formula for the actual tooth height h is: h = c·D – (2 r + s)

and

Az b c D d dL Fa Fu Fva h l T n pmax r s z ␯ ␩z

Effective tooth flank area Factor Factor Outer diameter of teeth Inner diameter of teeth Fixing hole diameter Axial force Circumferential force Pre-load Actual tooth height Tooth width Transmitted torque Number of bolts in serration surface Maximum surface pressure Tooth root radius Crown clearance Number of teeth Safety factor Load bearing percentage (0.65 if milled, 0.75 if ground)

9

Voith Turbo GmbH & Co. KG Universal Joint Shafts and Hirth Couplings Alexanderstr. 2 89522 Heidenheim, Germany Tel. +49 7321 37-4602 Fax +49 7321 37-7206 [email protected] www.voithturbo.com/hirth-coupling

Three-part coupling design – invented by Voith Turbo

2 3

4

6

5 7

1 2 3 4 5 6 7 H

Housing Upper section of indexing table Rotating toothed ring Fixed toothed ring Closing toothed ring Radial bearing Lifting cylinder

H

Schematic diagram of non-lifting rotary indexing table with Voith Hirth serration in 3 toothed ring design

H Hirth serration

Advantages of 3-part Voith Hirth toothed rings in … The idea of using 3 toothed rings enables hugely advantageous designs to be realized, particularly in machine tool engineering. Frequent applications include non-lifting rotary index tables and tool holders.

non-lifting rotary indexing table

tool holders

 Minimal force required to rotate the workpiece  Incursion of coolant can easily be prevented  Cost-optimized design  High positioning accuracy (indexing accuracy ± 2”)

 Short travel distances when changing tools  Quick tool changes

G 699 en, aik-SDL / WA, 06.2007, 1.500. Dimensions and illustrations without obligation. Subject to modifications.

1

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