EP2252498A1 - Système d'étanchéité pour fourche à suspension - Google Patents

Système d'étanchéité pour fourche à suspension

Info

Publication number
EP2252498A1
EP2252498A1 EP09709924A EP09709924A EP2252498A1 EP 2252498 A1 EP2252498 A1 EP 2252498A1 EP 09709924 A EP09709924 A EP 09709924A EP 09709924 A EP09709924 A EP 09709924A EP 2252498 A1 EP2252498 A1 EP 2252498A1
Authority
EP
European Patent Office
Prior art keywords
fork
seal
fork according
sliding tube
suspension
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Withdrawn
Application number
EP09709924A
Other languages
German (de)
English (en)
Inventor
Stephan Kotzlowski
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.)
B-Labs AG
Original Assignee
Albrecht Stephen
Felsl Andreas
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 Albrecht Stephen, Felsl Andreas filed Critical Albrecht Stephen
Publication of EP2252498A1 publication Critical patent/EP2252498A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/06—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms
    • B62K25/08—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms for front wheel
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3278—Details for lubrication
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/366—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings

Definitions

  • the invention relates to a suspension fork for a bicycle, in particular for a mountain bike, according to the preamble of claim 1.
  • the known suspension forks have steel springs, elastomeric suspensions and or air suspensions, each associated with a damping.
  • a hydraulic damping is provided, wherein, for example, in the case of a RightSideUp suspension fork, an open oil reservoir is formed in the hub-side, comparatively thick sliding tube. In the axial displacement of this sliding tube with respect to the standpipe fixed relative thereto, the resulting reduction of a part of the oil receiving pressure chamber, oil displaced from this and displaced via a valve, such as an adjustable throttle opening in another pressure chamber, so that a damping the suspension takes place.
  • BESTATIGUNGSKOPIE also called scraper ring, which is inserted into the standpipe-side annular end face of the sliding tube and sealingly abuts the outer periphery of the thinner standpipe.
  • a problem with such constructions is that the overhead plain bearing and a wiper ring to retain the outside entering dirt to supply sufficient oil, so that the fork has a good response even in harsh conditions. In other words, it must be ensured that from the above-mentioned scraper ring downwards always a sufficient sliding film is formed on the guided in the sliding tube standpipe. This is particularly important in view of the temperature-changing viscosity of the oil, since it is very difficult, for example, in winter at low temperatures, to form the above-described lubricating film in the region of the upper plain bearing. In case of strong temperature differences, it may even be necessary to replace the oil depending on the application.
  • the present invention seeks to provide a front fork, in which even under unfavorable conditions, a sufficient easy-to-use lubrication is ensured.
  • the fork provided for a bicycle in particular for a mountain bike, has at least one fork leg, which has a standpipe supported on the frame, on which a slide arrangement carrying a hub is displaceably guided via a bearing arrangement.
  • the seal between the sliding tube and the standpipe is made by a seal.
  • the suspension fork is designed with a lubricant volume which is delimited in the radial direction by the inner circumferential wall of the sliding tube and by the outer peripheral wall of the standpipe on the one side by the seal and on the other hand by an inner seal.
  • the lubricant volume which preferably has nothing to do with the oil reservoir of hydraulic forks, opens up the possibility of using different oils optimized for the damping and for the oil volume with regard to the respective application (damping / lubrication).
  • the bearing assembly has two axially spaced bearing bushes.
  • the inner direction may be arranged to limit the lubricant volume between the bearing bushes, so that a lubrication in the region of the upper bearing bush is guaranteed by the lubricant volume.
  • the volume of lubricant in the axial direction may extend beyond the second, lower bushing out to the hub.
  • the arranged within the lubricant volume bearing bush preferably has a plurality of inner longitudinal grooves, each of which form passage channels for the oil.
  • these passageways are connected to each other in the circumferential direction.
  • Figure 1 is a view of a fork for a mountain bike
  • Figure 2 is a sectional view through a fork leg of the fork of Figure 1 and
  • FIG. 3 shows a sectional view of a bearing bush of the suspension fork according to FIG. 1 and FIG. 2.
  • FIG 1 shows an embodiment of a suspension fork for mountain bikes. Details of this suspension fork are available at www, bionicon.de, so that only the essential elements for understanding the invention are described here. Of course, the invention can also be used in other suspension fork constructions.
  • the suspension fork 1 has two fork legs 2, 4, each having a respect to the frame fixed standpipe 6, which dips into a sliding tube 8 with a larger diameter. It is therefore a so-called RightSideUp fork.
  • the two uprights 6 are connected to each other via two spaced apart yokes 10, 12, which are clamped on the outer circumference of the uprights 6.
  • the top in Figure 1 fork bridge 12 carries an adjustable handlebar stem 14. About the two fork bridges 10, 12 and a steering head shaft, not shown, and a headset, the suspension fork 1 is mounted on the steering or control head of the frame.
  • each dropouts 18 are provided for receiving a front hub.
  • each have a spring element (elastomer, steel spring, air spring device) is arranged, which can be assigned a hydraulic damping.
  • the oil reservoir of this hydraulic damping can also be accommodated in the sliding tube 8.
  • the suspension fork 1 is additionally designed with a spring travel adjustment.
  • Figure 2 shows a simplified sectional view along the line AA in Figure 1, wherein the outer geometry of the sliding tube 8 is shown simplified.
  • the standpipe 6 designed with a comparatively smaller diameter plunges into the sliding tube 8 and is guided in this via a slide bearing arrangement with two bearing bushes 20, 22 which are arranged at an axial distance from each other, the structure of which will be described below.
  • the inner circumferential wall 24 is stepped in the storage area, so that an annular shoulder 26 is formed on which the lower bearing bush 22 is supported in Figure 2.
  • an inner seal 28 is seated, which is inserted into the widened part of the sliding tube 8.
  • This inner seal 28 is in the illustrated embodiment of an outer O-ring 30, which surrounds a favorable in terms of dynamic loads X-ring 32.
  • a spacer bushing 34 is inserted into the widened part of the sliding tube 8, but its inner diameter is greater than the outer diameter of the upright tube 6, so that an annular space 36 remains.
  • the second bearing bush 20 is located, which is held by a scraper 38 in contact with the spacer bushing 34.
  • This scraper 38 is inserted into the end portion of the sliding tube 8 located at the top in FIG. 2 and has sealing lips 40 with which it rests sealingly against the outer circumference of the upright tube 6.
  • an additional lubricant volume 42 is limited in the axial direction and by the inner peripheral wall of the sliding tube 8 and the outer peripheral wall of the standpipe 6 in the radial direction, which also contains the above-described annular space 36.
  • This additional volume may be filled with oil to ensure adequate lubrication of the upper bushing 20, which is within this additional lubricant volume 42.
  • a filling connection 44 and an overflow connection 46 are formed in the circumferential wall of the sliding tube 8, into each of which a filling or overflow nipple can be inserted.
  • these ports 44, 46 are designed as bores, wherein the filling port 44 opens just above the inner seal 28 and the overflow port 46 just below the scraper 38 in the lubricant volume 42, so that ensures a reliable filling and complete draining of this oil is.
  • Figure 3 shows the basic structure of the bearing bush 20, wherein for clarity, only one half is shown. Accordingly, the bearing bush 20 has on its inner peripheral wall a plurality of axially parallel passageways 44 which are distributed uniformly around the circumference. The bearing bush 20 is inserted with its outer peripheral surface 50 into the sliding tube 8, while the longitudinal surfaces 52 of the passageways 50 delimiting webs act as sliding surfaces for the standpipe 6.
  • the lower, hub-side bushing 22 is disposed outside of this additional volume of oil.
  • the inner seal 28 could also be arranged below this bearing bush 22, so that it too is lubricated by the additional oil volume.
  • the lower bearing bush 22 is designed in the same way as the bearing bush 20 described in FIG.
  • the construction according to the invention ensures that the two bearing bushes 20, 22 can also be arranged with forks with spring travel adjustment at a maximum distance from each other and that the upper bearing bush 20 and the scraper 38 (he generates the most friction in the system) always sufficiently lubricated are so that the fork 1 maintains its predetermined response even in adverse environmental conditions, the oil filling can be changed very easily to ensure optimum lubrication at different temperatures and applications.
  • the construction according to the invention can in principle also be used in suspension forks, in which the sliding tube dips into the standpipe.
  • a suspension fork for a bicycle with a fork leg which has a frame-fixed standpipe, which is partially immersed in a sliding tube, wherein the leadership between sliding and standpipe via a bearing assembly.
  • an additional lubricant volume is provided, via which a sufficient lubrication of the bearing arrangement is ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)

Abstract

L'invention concerne une fourche à suspension pour un véhicule à deux-roues, en particulier un vélo tout-terrain, comprenant au moins un tube de fourche (2, 4) qui comporte un plongeur (6) côté cadre sur une partie duquel un fourreau (8) est guidé coulissant par l'intermédiaire d'un système de palier (20, 22), l'étanchéité du fourreau (8) étant assurée par l'intermédiaire d'un joint (38) appliqué de façon étanche sur la périphérie extérieure du plongeur. L'invention est caractérisée par un volume de lubrifiant (42) qui est formé dans un espace annulaire situé entre le fourreau (8) et le plongeur (6) et qui est délimité, sur la face, d'un côté par le joint (38) et de l'autre côté par un joint intérieur (28), l'espace annulaire étant accessible par au moins un raccord de remplissage (44, 46).
EP09709924A 2008-02-15 2009-02-16 Système d'étanchéité pour fourche à suspension Withdrawn EP2252498A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008009426A DE102008009426A1 (de) 2008-02-15 2008-02-15 Federgabel
PCT/DE2009/000203 WO2009100718A1 (fr) 2008-02-15 2009-02-16 Système d'étanchéité pour fourche à suspension

Publications (1)

Publication Number Publication Date
EP2252498A1 true EP2252498A1 (fr) 2010-11-24

Family

ID=40651739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09709924A Withdrawn EP2252498A1 (fr) 2008-02-15 2009-02-16 Système d'étanchéité pour fourche à suspension

Country Status (4)

Country Link
US (1) US8342554B2 (fr)
EP (1) EP2252498A1 (fr)
DE (1) DE102008009426A1 (fr)
WO (1) WO2009100718A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1405609B1 (it) * 2010-06-11 2014-01-17 Skf Ab Unita' di guida lubrificata per gambali di forcelle motociclistiche
JP5863540B2 (ja) * 2012-04-02 2016-02-16 本田技研工業株式会社 自動二輪車及びフロントフォーク
US10487901B2 (en) 2017-01-09 2019-11-26 Beijingwest Industries Co., Ltd. Damping strut
DE102018101548A1 (de) * 2018-01-24 2019-07-25 Ktm Ag Teleskopfedergabelbein und damit versehene Teleskopfedergabel
US11396344B2 (en) 2018-10-26 2022-07-26 Fox Factory, Inc. Bushing bypass
WO2020157816A1 (fr) * 2019-01-29 2020-08-06 株式会社ショ－ワ Dispositif amortisseur hydraulique et son procédé de fabrication

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH281935A (fr) * 1948-09-10 1952-03-31 Dunlop Rubber Co Amortisseur de chocs.
DE1630168B2 (de) * 1967-04-04 1974-08-22 Christian Genf Bourcier De Carbon (Schweiz) Dämpfer- oder Federbein für Fahrzeug-Radachsabstützungen
US3797615A (en) * 1972-10-06 1974-03-19 H Stembridge Impact cushioning device
DE2849100C2 (de) * 1978-11-11 1982-12-23 August Bilstein GmbH & Co KG, 5828 Ennepetal Lasttragendes Federbein für Kraftfahrzeuge, insbesondere Vorderachsbein
JPS57166990U (fr) 1981-04-17 1982-10-21
JPS608182A (ja) * 1983-06-28 1985-01-17 本田技研工業株式会社 二輪車用フロントフオ−ク
US4971344A (en) * 1989-01-04 1990-11-20 Rockshox, Inc. Bicycle with a front fork wheel suspension
JP3949195B2 (ja) * 1996-11-07 2007-07-25 株式会社ショーワ 倒立型ストラットダンパ
US20060103075A1 (en) * 2004-11-15 2006-05-18 Zahn Henry W Triple lip fork seal
DE102006010245A1 (de) 2006-03-02 2007-09-06 Gustav Magenwirth Gmbh & Co. Kg Federwegsverstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009100718A1 *

Also Published As

Publication number Publication date
WO2009100718A1 (fr) 2009-08-20
US8342554B2 (en) 2013-01-01
US20110042915A1 (en) 2011-02-24
DE102008009426A1 (de) 2009-08-20

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