A revolutionery range of products which is used in various applications in the Automotive and Trucks industry to control Noise and vibrations. Ideal for NVH teams , e-cars, Hybrids etc.... Hocine Dahmane Key account Manager hocine.dahmane@stop-choc.de +4917622094808

1. HUTCHINSON
STOP-CHOC GMBH
50 YEARS OF INNOVATION FOR COMFORT AND SAFETY
Company Profile
Hocine Dahmane
Key Account Manager Automotive & Truck Confidential

2. The Hutchinson Group
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 96 sites globally
 > 35.000 employees
 3.462 M€ sales
 171M€ research spending
Germany
HUTCHINSON STOP-CHOC
Competence centre wire mesh technology
France
HEADQUATER
Great Britain
Belgium
Poland
Spain
Italy
Switzerland
Czech Republic
Romania
Mexico
USA
Canada
Brazil
India
Japan
China
South
Korea

3. The Hutchinson Group
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The Hutchinson Group is a
100% subsidiary of Total SA
in the chemicals division.

4. Our Vision
Our know-how is guided by four challenges:
 high vibration and acoustic performance
 high product quality
 rapid development times
 innovative solutions to the needs of our customers
”Excellence in noise and vibration control”
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5. The Application Fields
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Cars
Navy &
Marine
General
Industry
Aerospace
Trucks
RailwayDefense

6. Quality and operational excellence
 ISO 9001
 ISO/TS 16949
 ISO 14001
 Continuous improvement (KVP process)
 Lean employment (BSC, HPS, HSA)
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7. WIRE MESH TECHNOLOGY

8.  The elastic medium is made of CrNi wire
 A single wire as a basis for the compound knitted fabric
 Circular knitting process
Elastic metal cushion
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1. knitting
3. pressing
2. rolling/folding
Manufacturing process
4 to 300 mm in diameter

9. From knitting to cushions
Circular knitting process
A
B
C
D
A: Steel wire roll
B: wires feeders
C: Knitting head
D: knitted steel sleeve
Knitting Knitted and
Rolled
Wire
cylinder
Metal cushion
Metal knitted sleeves
Metal wires with a mesh structure similar to
stockings or sweaters.
The structure consists of intertwined loops
The loops can move from one to another on the
same plane without destroying the mesh
structure.
All-metal cushion (GMK)
Are the cylindrically pressed sleeve compressed
in various forms.

10. Automation a key competence
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11. Elastic metal cushion
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12. Working range
0
1000
2000
3000
4000
5000
6000
7000
8000
0 0,5 1 1,5 2 2,5
ForceN
Deflection mm
Compression characteristic 51543
Preferred working
range

13. Confidential

14. Density and load capacity
0
2000
4000
6000
8000
10000
12000
14000
16000
0 2 4 6 8 10 12
ForceN
Deflection mm
Characteristic curves - density 1,42 to 1,89g/cm³
Cushion 50210/211/212 (same geometry, increased density and forming load)
50210
50211
50212
D1 = 47,5mm / d = 10,0mm / H1 = 25,0+0,3mm / 1.4301 / 0,23mm
Maximum allowable
load increases with
forming load and
density

15. Natural frequency
0
1000
2000
3000
4000
5000
6000
7000
8000
0 0,5 1 1,5 2 2,5
ForceN
Deflection mm
Compression characteristic 51543
Lowest practicable
natural frequency
between 15 and 20 Hz
Natural frequency
depends on static load
(working point)

16. Confidential

17. Confidential

18. Selection
Step 1: suspended mass?
Step 2: excitation frequency?
Step 3: necessary frequency of resilient mounting?
Step 4:
fe ≥ 15…20Hz  cushion possible
fe ≤ 15…20Hz  cushion-spring combination necessary or elastomer
Step 5: loads and direction? critical loads? shock?

19. Wide range of applications
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Fuel Injector
Decoupler
Auxiliary units
Decoupling elements
Motion control
Bracket decoupling
Exhaust system
Decoupling elements
 Minimization of structure borne noise
 Acoustics: reduction of noise level
 Tolerance compensation
 Absorbing of thermal expansion
 Heat conductor (cooling of batteries)
 Filter
 Power transmission

20. APPLICATION EXAMPLES
AUTOMOTIVE

21. Decoupling elements for injectors in engines
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Benefit: Noise reduction
Metal mesh

22. Electronic control units
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Vibration control of sensitive equipment
Device protection and extension of life time
metal cushion solution

23. High temperature sensor in exhaust systems
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Ceramic part protection – vibration reduction
Temperature range:
-40°C to +850°C (continuous) 900°C (survival)
High temperature
sensor

24. Seat belt tensioning
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Safety – Shock bumper and elimination of fire hazard
function principle
wire mesh

25. Motion control
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Bracket decoupling: Vibration control and absorption of thermal expansion
Bracket design for
turbo chargers
Bracket design for
EGR valve

26. Fluid transfer systems
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Vibration control and lifetime extension
mounting
Vibration performance – reduction of the acceleration on the water pipe
Redesign
water pipe mounting

27. Auxiliary units - Converter
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Component protection
Series solutionFirst prototypeWithout decoupling element
 Protection of the capacitors due to isolation higher than 500Hz
 Low amplitudes in resonance due to damping ratio up to 25%.
 Wire, sealing and connectors protection

28. Electrical auxiliary units - Compressor
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Component protection
metal mesh
solution
 High vibration isolation performance under demanding conditions
 acoustic properties
 Reducing steering wheel vibrations

29. Electrical auxiliary units – water pump
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Component protection
metal
cushion
 Component protection (capacitors, cables) through isolation higher 500Hz
 High durability (engine mounted)
 Low amplitudes in resonance through damping up to 25%.
 Cable, sealing and connector protection

30. Summary
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31. References
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32. Thank you
for your attention
Hocine Dahmane
Key Account Manager Automotive & Truck
Antivibration & Noise Reduction Systems
Hutchinson Stop-Choc GmbH & Co. KG
Benzstraße 42 - 71272 Renningen - Germany
Mobile: +4917622094808
Email: hocine.dahmane@stop-choc.de
www.stop-choc.de