GB2210949A - Disc spring - Google Patents

Disc spring Download PDF

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Publication number
GB2210949A
GB2210949A GB8723878A GB8723878A GB2210949A GB 2210949 A GB2210949 A GB 2210949A GB 8723878 A GB8723878 A GB 8723878A GB 8723878 A GB8723878 A GB 8723878A GB 2210949 A GB2210949 A GB 2210949A
Authority
GB
United Kingdom
Prior art keywords
disc spring
discs
disc
plastics material
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8723878A
Other versions
GB8723878D0 (en
GB2210949B (en
Inventor
William Frederick Atkinson
Nigel Peter Gray
Anthony Thomas Walsh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Federal Mogul Technology Ltd
Original Assignee
T&N Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by T&N Technology Ltd filed Critical T&N Technology Ltd
Priority to GB8723878A priority Critical patent/GB2210949B/en
Publication of GB8723878D0 publication Critical patent/GB8723878D0/en
Publication of GB2210949A publication Critical patent/GB2210949A/en
Application granted granted Critical
Publication of GB2210949B publication Critical patent/GB2210949B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/32—Belleville-type springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials

Abstract

The discs 1 of a disc spring are of resilient plastics material and have an integral stop 3 to limit axial distortion and so prevent cracking. As shown, discs of different thickness can be assembled into a stack to produce a spring of progressive or increasing rate. <IMAGE>

Description

Disc Springs This invention relates to disc springs.
A disc spring comprises discs formed as shallow truncated cones or like dished elements which are loaded so as to be distorted axially. Disc springs have been in use for decades and have been made from special metallic materials such as chrome-molybcenum alloys, but there have been proposals that they should be made of resilient plastics material (eg polyester and epoxy resins or thermo21astic polymers) preferably incorporating fibrous reinzorcement (eg glass, carbon or aramid fibres) which might be in the form of a fabrics so that the fibres would lie generally in the plane of the disc.We have found that disc springs made in this manner fail prematurely, owing to delamination or cracking which occurs on the upper disc surface.
According to the present invention, in a disc spring having discs of resilient plastics material, the discs have an integral stop to limit axial distortion.
The stop can be moulded as part of the disc, or it can be formed separately and subsequently boned or otherwise secured to the discs. It need not be of the same plastics material as that of the disc body.
A hole can be made centrally through each disc and stop to accommodate a guide rod, or external guide means (eg an enclosing tube) can be employed.
A stack of discs forming a spring according to the invention can tolerate extensive distortion, with all discs distorting to their maximum without any of them everting or 'flipping'.
Discs of different thickness and with cone-height: thickness ratio greater than the usual maximum of 1.4:1 can be assembled into a stack to produce a spring of progressive or increasing rate.
The invention is further illustrated with reference to the accompanying drawing, which is an axial section of one form of disc spring, and to the following example.
Example A glass fibre woven fabric (224 ends per 10cm; 8 end satin weave; 0.23mm thick; weight 297 g/n2) was impregnated with a solution of epoxy resin (Ciba-Geigy MY750) and hardener (HT972) in methyl ethyl ketone. Excess resin solution was squeezed from the impregnated fabric by passing it between rollers. The material was then heated at 1000C for 25 minutes to remove the solvent and part-cure the resin. Fifteen circular pieces of 150mrn diameter, five of 60mum diameter and twenty of 50mm diameter were cut from the sheet thus obtained.
The pieces were superimposed one upon another in the order just mentioned and the assembly was the press-cured in a conical disc mould. One half of the mould had a flat centre and the other had a recessed centre. Curing was at 1500C for 10 minutes and 0.7 MPa pressure.
The resulting disc was 3mm thick, with a central flat of 50mm diameter on the outer face and a built-up central stop of 5mm thickness on the inside face. The angle made by the flat with the conical wall was 1700. Such a disc has a maximum working distortion of Smm from a cone height of 1Omm.
To make a spring, discs (numbered 1 in the accompanying drawing) are bored centrally through their flats 2 and stops 3 and are assembled as pairs in alternating arrangement with their margins 4 abutting and enclosing 2 space 4a, on a central guide 5 in the form of a steel bolt on which they are lightly compressed between flanges (not shown). Half the distance d between opposed stops 3 is the maximum distortion of each disc. The discs may be of different thickness, as shown by t1 t2 and t3.
In a procedure alternative to that described in the above Example, stops were made by cutting 50mm diameter circles from Smm thick sheets of glass-fibre-reinforced epoxy resin or polyethylene. These stops ere then bonded to the 150mm diameter disc elements using a toughened acrylic adhesive.

Claims (5)

1. A disc spring in which the discs are of resilient plastics material and have an integral stop to limit axial distortion.
2. A disc spring according to claim 1 having guide means in the form of a centrally disposed rod or the like passing through holes in the discs.
3. A disc spring according to claim 1 or 2 in which the plastics material is reinforced with fibre.
4. A disc spring according to claim 3 in which the fibre is incorporated in a fabric.
5. A disc spring substantially as described with reference to the Example and drawing herein.
GB8723878A 1987-10-10 1987-10-10 Disc springs Expired - Lifetime GB2210949B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8723878A GB2210949B (en) 1987-10-10 1987-10-10 Disc springs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8723878A GB2210949B (en) 1987-10-10 1987-10-10 Disc springs

Publications (3)

Publication Number Publication Date
GB8723878D0 GB8723878D0 (en) 1987-11-11
GB2210949A true GB2210949A (en) 1989-06-21
GB2210949B GB2210949B (en) 1991-03-27

Family

ID=10625162

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8723878A Expired - Lifetime GB2210949B (en) 1987-10-10 1987-10-10 Disc springs

Country Status (1)

Country Link
GB (1) GB2210949B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0837264A3 (en) * 1996-10-21 1998-12-02 Borg-Warner Automotive, Inc. Mechanical chain tensioner with belleville springs
DE10205595A1 (en) * 2002-01-25 2003-08-14 Muhr & Bender Kg Belleville spring
FR3041400A1 (en) * 2015-09-17 2017-03-24 Peugeot Citroen Automobiles Sa SUSPENSION SPRING OF MOTOR VEHICLE
US20190120307A1 (en) * 2015-06-09 2019-04-25 Federal-Mogul Bremsbelag Gmbh Flexible mounting of friction lining elements in brake linings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0837264A3 (en) * 1996-10-21 1998-12-02 Borg-Warner Automotive, Inc. Mechanical chain tensioner with belleville springs
DE10205595A1 (en) * 2002-01-25 2003-08-14 Muhr & Bender Kg Belleville spring
US20190120307A1 (en) * 2015-06-09 2019-04-25 Federal-Mogul Bremsbelag Gmbh Flexible mounting of friction lining elements in brake linings
FR3041400A1 (en) * 2015-09-17 2017-03-24 Peugeot Citroen Automobiles Sa SUSPENSION SPRING OF MOTOR VEHICLE

Also Published As

Publication number Publication date
GB8723878D0 (en) 1987-11-11
GB2210949B (en) 1991-03-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921010