EP0608384A1 - Procede et dispositif de montage d'un element amortisseur entre deux axes mecaniques concentriques dont l'un est soumis a des vibrations - Google Patents
Procede et dispositif de montage d'un element amortisseur entre deux axes mecaniques concentriques dont l'un est soumis a des vibrationsInfo
- Publication number
- EP0608384A1 EP0608384A1 EP92923855A EP92923855A EP0608384A1 EP 0608384 A1 EP0608384 A1 EP 0608384A1 EP 92923855 A EP92923855 A EP 92923855A EP 92923855 A EP92923855 A EP 92923855A EP 0608384 A1 EP0608384 A1 EP 0608384A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- damping element
- shaft
- steering shaft
- axial
- internal
- 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.)
- Withdrawn
Links
- 238000013016 damping Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229920001971 elastomer Polymers 0.000 claims abstract description 17
- 239000000806 elastomer Substances 0.000 claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000003754 machining Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 235000019589 hardness Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K21/00—Steering devices
- B62K21/18—Connections between forks and handlebars or handlebar stems
- B62K21/20—Connections between forks and handlebars or handlebar stems resilient
Definitions
- the present invention relates to a method and a device for mounting a damping element between two concentric mechanical axes, one of which is subjected to vibrations.
- the invention is particularly intended to equip forks and seatposts for cycle.
- Various damping systems are known which are intended to dampen the vibrations between two mechanical elements, one of which is subjected to vibrations.
- telescopic systems are liable to be deformed so as to absorb mainly large amplitude shocks, but, conversely, they are ill-suited to attenuate vibrations of small amplitude, such as the shocks transmitted by the handlebars or the saddle of a bicycle riding on rough terrain.
- silencers otherwise known as silentbloc, which consist of small blocks of treated and compressed rubber, interposed between parts whose relative movement is very weak to absorb noise and vibrations; the hardness of the silencers, which depends on the treatment they have undergone, is however not adjustable, and, as a result, they cannot easily be adapted to the very diverse conditions encountered in the equipment of the fork or seat post of a cycle.
- the present invention aims to remedy these drawbacks by proposing a method of mounting a damping element between two concentric mechanical axes, interior and exterior, one of which is subjected to vibrations, by which the exterior mechanical axis is slidably mounted. around the internal mechanical axis to come into positive contact on one of the faces of said damping element, the latter being constituted by an elastomer block or the like, which is bored to provide a passage for said internal axis; this process is characterized in that said damping element is mounted precompressed between two stops, at least one of which is adjustable and the other of which is fixed relative to said internal axis.
- the elastomer block used as a damping element is to be distinguished from the already known silencers or silentblocks; indeed, the precompression of a block of normally " uncompressed " elastomer, and often used as such to absorb short shocks or impacts, is not comparable to the permanent crushing of the cells of a rubber treated for silencers
- the precompression of the damping element provides, on the one hand, the advantage of minimizing the response time of this element to an external stress, and, on the other hand, makes it possible to accurately predict the conditions of damping.
- the elastomer damping element fulfills the role of a filter, and the precompression, in this case, is entirely comparable to continuous electric polarization which must be applied to an amplifier or an electronic filter so that its response to a low amplitude input signal is perfectly known.
- this damping element being constituted by a block of elastomer or the like, which is bored to provide a passage for said internal axis, this device being characterized in that it comprises:
- a plunger which is mounted internally to the external mechanical axis to come into positive contact against one of the faces of said damping element, and externally to the internal mechanical axis so as to be able to at least slide axially around this same axis,
- an adjustable stop mounted along said internal mechanical axis, on the side of said plunger which is opposite to said damping element, so as to limit to a given maximum value the size of the axial stacking of said damping element and said plunger .
- the value of the precompression of the damping element is adjusted, according to the invention, by the play of the two stops whose spacing is adjustable, the crushing at rest of said damping element consequently depending directly on the position of the stop mounted mobile along the internal mechanical axis.
- Another possibility of adjusting the coefficient of absorption of vibrations stressing the internal mechanical axis is to choose the damping element from several elastomer materials of different hardnesses.
- an elastomeric material of the type known under the trade name Schochten will be used, which is capable of providing damping greater than 50%, in a time corresponding to one period or less of the harmonic oscillation considered (high resilience).
- Schovier elastomeric material of the type known under the trade name Schovier
- the plunger on which the external mechanical axis is mounted is mounted free in rotation relative to the internal mechanical axis, so that these two axes can move freely in rotation relative to each other.
- An application of this first variant consists in equipping the non-steerable wheel supports of all the rolling machines subjected to vibrations (trolley wheels, wheelchairs wheels for the disabled, etc.) or the seat legs subjected to vibrations. important (seats of transport vehicles, professional seats of machine tools, or machines placed in an industrial environment, ).
- the plunger is locked against rotation relative to the external mechanical axis, said plunger being also locked against rotation relative to the internal mechanical axis.
- the plunger can be riveted, glued or welded inside the external mechanical axis.
- Such a device can in particular equip the steering forks of cycles (front forks).
- the plunger be constituted by an annular ring provided with a set of axial internal splines , parallel to each other, so as to cooperate with axial grooves made outside the internal mechanical axis. Therefore, when tremors come to stress the internal mechanical axis, the latter can slide inside the grooved annular ring, without having any play in rotation; consequently, the annular ring slides opposite to its stop and compresses the damping element, through which the vibrations are transmitted to the external mechanical axis with a markedly reduced amplitude.
- FIG. 1 is an exploded mounting view of a front fork of a bicycle equipped according to the invention
- FIG. 2 is an exploded mounting view of the same fork shown in a later phase of assembly
- FIG. 3 is a partial sectional view of the same fork mounted, with, in enlarged view, the pre-compressed damping element,
- FIG. 4 is an exploded mounting view of a seat post fitted according to the invention
- FIG. 5 is a view of the same seat post mounted.
- a method of manufacturing a front fork of a cycle, provided with two tubes 1 for holding a wheel is characterized in that it comprises at least the following successive phases: a) machining of a steering shaft 2 of a determined length L, comprising a smooth cylindrical lower surface 3 and an upper surface 4 provided with axial external grooves 5, parallel to each other. b) assembling the lower cylindrical bearing surface 3 of said steering shaft 2 inside an annular bush 6; this assembly is preferably carried out by high temperature welding, of the TIG type, so as to obtain a constriction of said sleeve 6 on the cylindrical surface 3 in the manner of a hoop.
- the assembly formed by the lower cylindrical bearing surface 3 of the steering shaft 2, which is welded inside the annular sleeve 6 which supports the fork tubes 1, is bored in the median plane of these two tubes 1 to provide a horizontal passage opening to the rod of a safety hook 15, mounted under the brake cable support 16 to hold, if necessary, the brake cable and prevent it from falling on the wheel .
- the support of the brake cable 16 is mounted in claw around the steering shaft 2, and it is gripped between the top of the fork tubes 1 and the underside of the damping element 7, or of the lower washer 8 forming a cup which is arranged under said damping element 7. Furthermore, the support of the brake cable 16 is held, behind the steering shaft 2, by a nut 17 screwed around the threaded end 18 of the rod of the safety hook 15 passing through said steering shaft 2.
- a method of modifying the fork Before a cycle, provided with two tubes 1 for holding a wheel, is characterized in that it comprises at least the successive phases following its ) machining of a steering shaft 2 comprising a smooth lower cylindrical surface 3 and an upper surface 4 provided with axial external splines 5, parallel to each other. b) cutting off the original pivot tube of said fork. c) mounting of the steering shaft 2 inside of said sectioned pivot tube, so that after assembly, the length of the assembly is equal to a determined value L; moreover, the steering shaft 2 is locked in rotation relative to said cut-off pivot tube, for example by riveting, welding or bonding.
- a method of manufacturing a saddle support for cycle comprises at least the following successive phases: a) machining of a assembly shaft 19 of a determined length L, comprising a cylindrical-conical upper bearing 20 and a lower bearing 21 provided with axial external splines 22, mutually parallel, b) bore of the saddle head 23 in the axis of the seat tube 24, so as to accommodate therein a ring 25 having a conical internal bearing surface, the large base of which faces downwards, and in which the cylindro-conical bearing 20 of the assembly shaft is engaged 19, c) blocking of the assembly shaft 19 in positive abutment against the conical ring 25, for example by means of a screw 26 cooperating with a threaded hole arranged for this purpose at the top of said shaft 19; this screw 26 is mounted above the saddle head 23 and keeps the conical ring 25 enclosed in its housing 25JD.
- a damping element 7 which is substantially identical to those used in the other applications of the invention already described.
- This damping element 7 is enclosed between a first upper washer 27 and a second lower washer 28 forming cups, the latter coming to bear against an annular ring 29 provided with a set of axial internal grooves, mutually parallel, cooperating with the axial grooves 22 practiced outside the tree assembly 19.
- the frustoconical shape of the damping element 7 is not compulsory.
- the screws 12 and 31 could be replaced by other locking means, for example of the type of pins or pin pins.
- the upper surface 4 of the steering shaft 2 could comprise only a single axial semi-cylindrical groove cooperating with a single axial semi-cylindrical groove provided for this purpose on the inside of the annular ring 10, so as to constitute a cylindrical housing for a needle for blocking the rotation of said annular ring 10 relative to the steering shaft 2, this cylindrical needle having a diameter equal, apart from the functional clearance, to that of the cylindrical housing thus constituted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9113225A FR2683010B1 (fr) | 1991-10-25 | 1991-10-25 | Procede et dispositif de montage d'un element amortisseur entre deux axes mecaniques concentriques dont l'un est soumis a des vibrations. |
| FR9113225 | 1991-10-25 | ||
| PCT/FR1992/000995 WO1993008070A1 (fr) | 1991-10-25 | 1992-10-26 | Procede et dispositif de montage d'un element amortisseur entre deux axes mecaniques concentriques dont l'un est soumis a des vibrations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0608384A1 true EP0608384A1 (fr) | 1994-08-03 |
Family
ID=9418339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92923855A Withdrawn EP0608384A1 (fr) | 1991-10-25 | 1992-10-26 | Procede et dispositif de montage d'un element amortisseur entre deux axes mecaniques concentriques dont l'un est soumis a des vibrations |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0608384A1 (fr) |
| FR (1) | FR2683010B1 (fr) |
| WO (1) | WO1993008070A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5688317A (en) * | 1992-08-27 | 1997-11-18 | Cabot Corporation | Carbon blacks |
| TWM419725U (en) * | 2011-08-04 | 2012-01-01 | Hsin Lung Accessories Co | Damping structure of bike |
| DE102018002277A1 (de) * | 2018-03-20 | 2019-09-26 | Jörn GmbH | Lenkvorrichtung eines Zweirads, insbesondere eines Fahrrads mit einer Vorbaufederung |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR621878A (fr) * | 1926-09-22 | 1927-05-19 | Perfectionnements à la suspension élastique des selles et guidons de bicyclettes et motocyclettes | |
| FR872359A (fr) * | 1940-10-01 | 1942-06-05 | Suspension combinée avec amortisseur pour bicyclette, tandem, motocyclette et véhicules similaires à selle | |
| FR84534E (fr) * | 1963-10-18 | 1965-02-26 | Moulton Consultants Ltd | Perfectionnements aux systèmes de suspension pour les roues avant des bicyclettes, cyclomoteurs, scooters et motocyclettes |
| AU5932590A (en) * | 1989-06-20 | 1991-01-08 | Rene Tranvoiz | Suspension device for the forks and saddle shafts of cycles or other wheeled objects |
-
1991
- 1991-10-25 FR FR9113225A patent/FR2683010B1/fr not_active Expired - Fee Related
-
1992
- 1992-10-26 EP EP92923855A patent/EP0608384A1/fr not_active Withdrawn
- 1992-10-26 WO PCT/FR1992/000995 patent/WO1993008070A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9308070A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2683010B1 (fr) | 1995-04-21 |
| WO1993008070A1 (fr) | 1993-04-29 |
| FR2683010A1 (fr) | 1993-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19940524 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IE IT LI LU NL SE |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TRANVOIZ, RENE Inventor name: DORMOY, DANIEL |
|
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: DORMOY, DANIEL |
|
| 17Q | First examination report despatched |
Effective date: 19941025 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19950503 |