DE102004037754A1 - Sealing arrangement for a bottom bracket bearing of a bicycle comprises a sealing ring which is attached to the outer bearing element, and is provided with a lip sealing the inner bearing element - Google Patents

Abstract

The sealing arrangement for a bottom bracket bearing of a bicycle comprises a sealing ring (60) which is attached to the outer bearing element (20), and is provided with a lip (62) sealing the inner bearing element (10). Independent claims are also included for: (A) a bicycle bottom bracket bearing with the proposed sealing arrangement; (B) a bicycle hub with the proposed sealing arrangement.

Description

The The invention relates to a sealing arrangement of a bicycle as well a bicycle bottom bracket and a bicycle hub with the seal assembly.

From the DE 90 14 394 U1 a seal for a Tretachslagerung a bicycle is known in which a sealing engagement with the shaft sealing washer between a sealing sleeve and a sealing element is arranged, wherein the sealing sleeve is provided with an axially extending portion which in a space between the shaft and a Wave enclosing sleeve is arranged protruding. It should be achieved with low friction with this embodiment, a good protection against dirt and water.

A The object of the invention is an improved sealing arrangement of a bicycle, which, in particular, will be sufficient Has sealing effect when dirt and / or moisture particles with a comparatively high pressure in the direction of the seal arrangement penetrate.

The The object is solved by the subject matter of claim 1. advantageous Embodiments are described in the subclaims.

• – Ein erstes sich in einer axialen Richtung erstreckendes Element,
• – ein zweites sich in axialer Richtung erstreckendes Element, das das erste wenigstens in einem Teilbereich umschließt,
• – die Elemente sind gegeneinander drehbar gelagert,
• – ein sich zwischen den Elementen erstreckender, abzudichtender Raum ist im Bereich wenigstens eines axialen Endabschnitts eines der Elemente mit einem, im Wesentlichen zwischen den Elementen angeordneten Dichtring geschlossen und
• – der Dichtring ist am zweiten Element befestigt und weist eine Dichtlippe auf, die an einer sich in radialer Richtung erstreckenden, ringartig umlaufenden Fläche des ersten Elements dichtend anliegt.

According to claim 1, a sealing arrangement of a bicycle has the following features

• A first element extending in an axial direction,
• A second axially extending element enclosing the first at least in a partial region,
• - The elements are rotatably mounted against each other,
• A space to be sealed extending between the elements is closed in the area of at least one axial end section of one of the elements with a sealing ring substantially arranged between the elements
• - The sealing ring is attached to the second element and has a sealing lip which sealingly bears against a radially extending, annularly circumferential surface of the first element.

Especially in that the sealing lip extends in the radial direction, ring-like circumferential surface the first element sealingly abuts, is particularly in a Penetration of moisture and / or dirt particles under increased pressure in the direction of the sealing ring, for example when cleaning the bike with a high-pressure cleaner, the sealing lip pressed as desired stronger and thus a reinforcement of their Sealing effect achieved, whereas in normal driving the bicycle the sealing lip with a lower, but still for the normal Driving a good sealing effect ensuring pressure, the low friction and thus a low wear of the sealing lip and thus causes a long life of the sealing ring.

Farther is in the seal assembly according to claim 1 with advantage Design favors that an automatic Re-emergence of once nevertheless penetrated to the sealing ring Moisture and / or dirt particles due to the effect of gravity allowed.

In an advantageous embodiment comprises the seal assembly a the sealing ring upstream, connected to the first element ring-like element with its outer circumferential surface in the radial direction an opposite one Inner surface area of the second element forming a narrow hollow cylinder-like gap designed and arranged. This is advantageous Vorschaltdichtungsfunktion for the Created sealing ring, so that a direct and unchecked Penetration of dirt and / or moisture particles in particular towards the sealing lip, for example, when cleaning the bike with a high-pressure cleaner is prevented.

In a further advantageous embodiment of the sealing ring with provided an annular spring. As a result, in particular with a sealing lip with V-shaped longitudinal section profile by a sealing concern of the top of the V-shape as another Sealing lip on a substantially axially extending surface a increased Sealing effect can be achieved, which is particularly true of bicycles Advantage is that for an employment in heavy terrain are provided.

Further Advantages, features and details of the invention will become apparent the embodiments of the invention described below the figures. Showing:

1 a longitudinal section through a bicycle pedal bearing with a seal assembly,

2 an enlarged detail of the 1 in the field of sealing arrangement and

3 a longitudinal section through an upper half of a sealing ring, which is provided with an annular spring.

The 1 shows as an embodiment of the invention a longitudinal section through a bicycle bottom bracket. In this case, the Fahrradtretlager comprises a substantially hollow cylinder-like wave 10 and an outer sleeve 20 that the wave 10 is arranged so surrounding that the two axial end portions of the shaft 10 via an axial extension of the outer sleeve 20 protrude.

The wave 10 is rotatable about two bearings in the outer sleeve 20 stored. One of the rolling bearings is designed as a cylindrical roller bearing, wherein the cylindrical rollers 32 in a cage 34 are guided and the wave 10 an inner raceway and the outer sleeve 20 form an outer race of the cylindrical roller bearing. The other of the bearings is designed as a ball bearing, wherein the balls 42 also in a cage 44 are guided and just like the cylindrical roller bearing, the shaft 10 an inner race and the outer sleeve 20 an outer raceway for the balls 42 form.

Between the outer sleeve 20 and the wave 10 extends here, the two bearings containing, to be sealed space to its seal at each of the two axial ends of the outer sleeve 20 one auxiliary ring each 50 in conjunction with a sealing ring 60 is provided. The 2 shows a detail enlargement from that in the 1 Z designated area, wherein in the following structure and operation of the auxiliary ring 50 and the sealing ring 60 exemplary for the in 2 illustrated ball bearing side is described, but applies in a corresponding manner for the cylindrical roller bearing side.

How to particular in 2 recognizes, is the sealing ring 60 formed with a substantially C-shaped longitudinal section profile, wherein the radially inner end of the C-shape for forming a substantially V-shaped longitudinal sectional profile having sealing lip 62 is continued. Here is the sealing ring 60 installed with the back side of the C-shape from the outside and in a correspondingly shaped axial end portion of the outer sleeve 20 in the outer sleeve 20 pressed.

The auxiliary ring 50 has approximately an L-shaped longitudinal section profile and is with one of the legs of the L-shape ahead of the outside of the shaft 10 pressed so that the corner of the L-shape axially outward on the shaft 10 is applied. The auxiliary ring 50 is made of aluminum, for example.

The entire bottom bracket assembly is designed such that when properly assembled the sealing lip 62 only at the free end of its V-shape, a substantially radially extending end face of the auxiliary ring 50 sealingly touched. Furthermore, the tip of the V-shape of the sealing lip 62 to a substantially axially extending lateral surface of the auxiliary ring 50 Spaced at a small distance.

The auxiliary rings 50 are designed such that they belong to the outer sleeve 20 or to one on the outer sleeve 20 attached intermediate sleeve 25 form a narrow hollow cylinder-like gap, so that the auxiliary rings 50 as a kind of labyrinth-like Vorschaltdichtungen for the sealing rings 60 act. In particular, when cleaning the arrangement, for example with a high-pressure cleaner from the outside, is due to the Vorschaltdichtungsfunktion the auxiliary rings 50 a direct and unchecked penetration of dirt and / or moisture particles in the direction of the sealing rings 60 prevented. Furthermore, still cause the sealing rings 60 penetrating water and / or dirt particles due to the design of the sealing rings 60 Advantageously by an increased pressing of the sealing lips 60 to said end faces of the auxiliary rings 50 an enhanced sealing effect, so that the space to be sealed is safely protected even at this load against penetration of moisture and / or dirt.

The sealing ring 60 is still designed in several parts. Thus, in the exemplary embodiment shown, it comprises a perforated disk-like support body forming the back of the C-shape 64 in which an outer and an inner elastomer part 66 and 68 vulcanized. Here is the outer elastomer part 66 together with the support body 64 for fixing to the corresponding shape of the outer sleeve 20 intended. The inner elastomer part 68 is the V-shaped sealing lip 62 designed forming and also has a circumferentially circumferential, radially inwardly projecting extension 63 on, as well as the top of the V-shape of the sealing lip 62 intended to the opposite lateral surface of the auxiliary ring 50 is spaced, and for the at least partially filled with grease sealed space fulfills a Fettrückhalte- or -rückförderfunktion. In another embodiment, the sealing ring may also be formed entirely of PTFE.

The 3 shows as a further embodiment of the invention, a sealing ring 60 ' , opposite the sealing ring 60 of the 1 and 2 additionally with a ring spring 70 is provided in the by the V-shape of the sealing lip 62 ' formed gutter is used. This is compared to the sealing ring 60 of the 1 and 2 for an additional sealing effect a concern of the tip of the V-shape of the sealing ring 60 ' on the corresponding opposite lateral surface of the auxiliary ring 50 causes. Otherwise, that applies to the previous 1 and 2 Described accordingly.

The are previously described as part of a Fahrradtretlagers sealing arrangements Naturally also in other parts of a bicycle, for example in the wheel hubs, used.

10

wave

20

outer sleeve

25

intermediate sleeve

32

cylindrical roller

42

Bullet

34 44

Cage

50

auxiliary ring

60 60 '

seal

62 62 '

sealing lip

63

extension

64

support body

66 68

elastomer part

70

Ringfeder

Claims (21)

Sealing arrangement of a bicycle with the following features: - One first element extending in an axial direction, - a second extending in the axial direction element, the first at least encloses in a partial area, - the Elements are rotatably mounted against each other, - one between the elements extending space to be sealed is in the range of at least one axial end portion of one of the elements with a, substantially closed between the elements arranged sealing ring and - the sealing ring is attached to the second element and has a sealing lip, the in a radially extending, ring-like circumferential surface the first element sealingly rests. Sealing arrangement according to claim 1, wherein the first Element associated with the first element, ring-like, the said area forming element comprises. Sealing arrangement according to claim 2, wherein the annular Element approximately with an L-shaped longitudinal section profile is trained. Sealing arrangement according to claim 3, wherein the annular Element is arranged such that the vertex of the L-shape with respect to to be sealed space as an axial outer point of the ring-like element rests against the first element. Sealing arrangement according to one of claims 2 to 4, wherein the annular element with an outer circumferential surfaces in the radial direction to an opposite one Inner surface area of the second element forming a narrow hollow cylinder-like gap designed and arranged. Sealing arrangement according to one of claims 2 to 5, wherein the sealing ring substantially between the annular and the second element. Sealing arrangement according to one of claims 1 to 6, wherein the sealing lip in the axial direction to the outside is formed cantilevered. Sealing arrangement according to one of claims 1 to 7, wherein the sealing ring formed approximately with a C-shaped longitudinal section profile is. Sealing arrangement according to claim 8, wherein the sealing ring is arranged such that the back of the C-shape substantially extends in the radial direction and in the axial direction with respect to the sealed Room is arranged inwards. Sealing arrangement according to one of claims 8 or 9, wherein the approximately axially extending inner part of the C-shape a the sealing lip approach opposite end in the Essentially in the radial direction inwardly projecting extension includes. Sealing arrangement according to one of claims 1 to 10, wherein the sealing lip formed approximately with a V-shaped longitudinal section profile is. A sealing arrangement according to claim 11, wherein the V-shape designed at the radially inner end of the C-shape continuing the C-shape is. Sealing arrangement according to one of claims 11 or 12, wherein the sealing lip is arranged such that the tip the V-shape comes closest to the first element in the radial direction. Sealing arrangement according to one of claims 1 to 13, wherein the sealing ring comprises an annular spring. A seal assembly according to claim 14, wherein the annular spring in the opening the V-shape of the sealing lip is arranged. Sealing arrangement according to one of claims 1 to 15, wherein the sealing ring is a support body and comprises at least one elastomer part. Sealing arrangement according to one of claims 1 to 15, the sealing ring completely made of PTFE. Sealing arrangement according to one of the Claims 1 to 17, wherein the first and the second element via at least one arranged within the space to be sealed bearings are mutually rotatable. A seal assembly according to claim 18, wherein the elements the rolling element raceways of the rolling bearing designed to be educational. Bicycle bottom bracket with a seal arrangement after one of the claims 1 to 19. Bicycle hub with a seal arrangement after one the claims 1 to 19.