DE112005000543B4 - wheel module - Google Patents

Abstract

Wheel module (1) which can be fastened to an inner side (4) of a running surface (2) of a tire (9) via fastening means (5), wherein a side (3) of the wheel module facing the running surface (2) of the tire (9) (1) is arched at least in the longitudinal direction (L) of the wheel module (1), which corresponds in particular to a direction of travel (X), wherein at least one skid-shaped longitudinal strut (6) is provided on the wheel module (1), characterized in that Fastening means (5) at least one elastic band (11) is provided, wherein the elastic band (11) is threaded through the wheel module (1) and fixed at one end to the wheel module (1) and the elastic band (11) with another End is attached to the tire (1).

Description

The present invention relates to a wheel module which, according to the preamble of claim 1, can be fastened via fastening means to an inner side of a tread of a tire.

From the German patent DE 44 02 136 C2 For example, a wheel module arranged inside the vehicle tire is already known, which has an acceleration sensor and a temperature sensor.

A wheel module with a pressure sensor is out of the US 4 246 567 A known. Here, the wheel module is attached by bonding to a dome made of non-conductive material. The dome in turn is also mounted by bonding to the inside of the tread of a motor vehicle tire. The wheel module comprises a piezoelectric crystal formed as a pellet, which has a flat surface and expands in the direction of the rolling radius of the tire. The wheel module is exposed to very high acceleration forces and resulting bending moments. In addition, contact with the tire and corresponding chafing may occur at the edges of the pellet, which may damage both the tire and the wheel module.

From the US 6255940 B1 , of the DE 102 43 441 A1 , of the US 20020174925 A1 , of the US 20030209064 A1 , of the US 20020044050 A1 and the EP 1 684 997 B1 in each case a wheel module is known, whose side facing the tire is curved.

Due to the curvature occurring forces and moments can be better absorbed. In addition, the chafing of the known from the prior art corners of the wheel module can be so significantly reduced on the tire.

It is therefore the object of the present invention to provide a wheel module that is better suited to the mechanical stresses and has a long service life. Furthermore, the tire should not be damaged by the module.

This object is achieved by a wheel module with the features of claim 1.

For this purpose, the wheel module according to the invention is formed curved on a side facing the tread of the tire side at least in the longitudinal direction, which corresponds in particular to a direction of travel of the vehicle. Furthermore, at least one runner-shaped longitudinal strut is provided on the wheel module. As fastening means of the wheel module on the tire, at least one elastic band is provided, which is threaded through the wheel module and attached at one end to the wheel module. The elastic band is attached to the tire at another end. The longitudinal brace is used to absorb forces and moments acting on the wheel module. In particular, this Längsverstrebung is formed curved as part of the wheel module.

Advantageously, according to a preferred embodiment of the present invention, the longitudinal radius of the wheel module, i. the radius of curvature, smaller than the rolling radius of the tire. This ensures that the rubbing of the wheel module on the tire is completely prevented, which in turn can increase the life of the tire.

According to one embodiment of the present invention, at least one, in particular bar-shaped, cross-bracing is further provided on the wheel module, which also serves to absorb forces and moments. Depending on the load collective, one or more cross braces may be provided.

If the wheel module comprises a pressure sensor, it is preferably provided in the vicinity of the side of the wheel module facing the tread of the tire. At this point, the centrifugal forces acting on the wheel module are greatest, which advantageously supports a self-cleaning of the pressure membrane.

Preferably, the at least one elastic band can be fastened to the wheel module via fixing means. As a fixing, for example, a fixing knob or a Fixierbügel in question. The elastic band can also be attached by gluing the wheel module.

According to a particularly preferred embodiment of the present invention, the wheel module, the at least one fastening means and the fixing means are arranged on a patch or patches. This patch can then be attached as a complete assembly on the tire, preferably by vulcanization.

• 1 eine schematische Ansicht eines aus dem Stand der Technik bekannten Radmoduls mit ebener Unterseite,
• 2 eine schematische Ansicht eines erfindungsgemäßen Radmoduls, bei dem die Unterseite gewölbt ist,
• 3 eine Quer- bzw. Seitenansicht einer ersten Ausführungsform der vorliegenden Erfindung,
• 4 eine Längsansicht der Ausführungsform gemäß 3,
• 5 eine zweite Ausführungsform der vorliegenden Erfindung in Quer- und Längsansicht sowie einer im Maßstab verkleinerten Draufsicht auf den Patch und
• 6 eine dritte Ausführungsform der vorliegenden Erfindung in Quer- und Längsansicht sowie einer im Maßstab verkleinerten Draufsicht, in der wiederum der Patch bzw. Flicken dargestellt ist.

In the following description, the features and details of the invention in conjunction with the accompanying drawings with reference to embodiments will be explained in more detail. In this case, features and relationships described in individual variants can in principle be applied to all exemplary embodiments. In the drawings show:

• 1 a schematic view of a known from the prior art wheel module with a flat bottom,
• 2 a schematic view of a wheel module according to the invention, in which the underside is curved,
• 3 3 is a transverse or side view of a first embodiment of the present invention;
• 4 a longitudinal view of the embodiment according to 3 .
• 5 a second embodiment of the present invention in transverse and longitudinal view and a reduced in scale top view of the patch and
• 6 a third embodiment of the present invention in transverse and longitudinal view and a reduced scale in plan view, in turn, the patch or patch is shown.

1 and 2 show a schematic view of a wheel module 1 that has fasteners 5 on the inside 4 a tire tread 2 is attached. By means of the wheel module 1 For example, data on one or more transmitting and receiving antennas, for example, arranged on the vehicle (not shown) can be transmitted wirelessly. The wheel module 1 may include at least one pressure sensor and optionally further sensors such as a temperature or an acceleration sensor (not shown).

By the attachment on the inside 4 the tread 2 becomes the wheel module 1 during a rotation of the tire 9 a centrifugal acceleration a suspended up to five thousand times the gravitational acceleration G (5000 g) can be. This centrifugal acceleration a is calculated according to the following known formula: $$\text{a}={\text{V}}^2/\text{R}$$

In the area of the Latsch, in which the tire 9 has direct contact with the roadway, acts because of the mounting on the inner circumferential surface 4 or the inside 4 the tire tread 2 no centrifugal acceleration a on the wheel module 1 because of the radius R here goes to infinity. The centrifugal acceleration a is still superimposed by originating from the surface condition of the roadway vertical accelerations. Consequently, very high acceleration changes occur during the transition to the lashing range or when leaving the lashing range, since in the lashing zone only the gravitational acceleration is involved G acts. This acceleration load is the wheel module 1 exposed during operation.

Since with given acceleration with increasing effective area also the bend or the wheel module 1 acting bending moment B increases, there is a risk of fatigue breakage of at least components on the wheel module 1 and / or a fraction of the example gemoldeten, so very brittle outer casing of the wheel module 1 ,

In addition, due to the system, for example, due to the transmission of energy via electromagnetic fields from an antenna to the wheel module 1 be required on this large diameter air coils (inductors), not shown. Only with this requirement can the energy required for operation be transmitted during one revolution of the wheel. This means large cross-sectional areas on the wheel module 1 to which the centrifugal forces a and bending moments B can act:

Another problem of only in 1 represented prior art is that this wheel module 1 Edges or chafing S which is in contact with the tire 9 and can cause a corresponding chafing, causing both the tire 9 as well as the wheel module 1 can be damaged.

As in 2 showing, in schematic view, the present invention is the wheel module 1 at one to the tread 2 of the tire 9 directed side 3 at least in the longitudinal direction L , in particular one direction of travel X corresponds to the vehicle, according to the invention curved. Due to the curvature occurring forces and moments can be better absorbed. The round transition can further chafe the known from the prior art corners of the wheel module 1 on the tire 9 be significantly reduced. Instead of a flat bearing surface of the wheel module 1 In other words, a curved support surface is provided.

Advantageously, according to a preferred embodiment of the present invention, the longitudinal radius r of the wheel module 1 ie the radius r the curvature, smaller than the rolling radius R of the tire 9 , This ensures that the rubbing of the wheel module 1 on the tire 9 to the in 1 shown chafing S is completely prevented, which in turn reduces the life of the tire 9 can be increased.

As in 3 and 4 shown, which show a first embodiment of the present invention is at the wheel module 1 preferably at least one, in particular runner-shaped, longitudinal strut 6 intended. This stringer 6 serves to absorb forces and moments on the wheel module 1 act. In particular, this stringer is 6 as part of the wheel module 1 arched trained.

In this embodiment, two longitudinal struts 6 available. By means of the preferred embodiment of the longitudinal struts 6 As runners is also advantageously a cavity between the wheel module 1 and the tire 9 created that prevents a dynamic pumping effect on the pressure sensor, not shown. A construction of the wheel module 1 made of solid material ( 2 ), but maintaining the rounded support surface 3 , is possible, but has the disadvantage of increased mass and increased use of materials.

According to one embodiment of the present invention, the wheel module 1 furthermore at least one, in particular bar-shaped, cross-bracing 7 provided, which also serves to absorb forces and moments. Depending on the load collective, one or more cross braces can be used 7 be provided. In 3 and 4 are two cross braces 7 present and bar-shaped. In particular, the cross braces 7 also with the longitudinal struts 6 be connected.

If the wheel module 1 comprises a pressure sensor (not shown), this is preferably in the vicinity of the tread 4 of the tire 9 directed side 3 of the wheel module 1 intended. At this point are the at the wheel module 1 attacking centrifugal forces greatest, which advantageously a self-cleaning of the pressure membrane of the pressure sensor is supported.

As a fastener of the wheel module 1 on the tire 9 is preferably at least one elastic band 11 provided, in this embodiment by the wheel module 1 threaded through it. An additional safeguard, for example, the adhesion of the tape 11 to the wheel module 1 or the fixation by means of a fixative, in particular a button 8th , This button 8th can be attached to the wheel module 1 For example, glued, locked or .verankert.

The 5 and 6 show two further embodiments of the present invention, in which the wheel module 1 in 5 by means of a considered individual and in 6 by means of a covered double band 11 is attached. This includes the elastic band 11 the wheel module 1 each such that the wheel module 1 essentially between the elastic band 11 and the tire 9 is arranged. In this variant must in the wheel module 1 advantageously no opening for the band 11 be provided.

Instead of in 5 shown fixing button 8th can according to 6 the attachment of the wheel module 1 on the tape 11 also via a fixing bracket 10 be made, preferably the wheel module 1 engages detentively.

In the respective lower illustration in 5 and 6 is a patch or patch in a plan view 12 in opposite to the two respective overlying illustrations shown on a reduced scale. According to a particularly preferred embodiment of the present invention, the wheel module 1 containing at least one fastening means 11 and the fixing agent 8th respectively. 10 on this patch or patch 12 arranged. In the patch 12 are recesses 13 for receiving the elastic band 11 appropriate. The patch 12 can then as a complete assembly on the tire 9 be fastened, preferably by vulcanization. In this way, the assembly can be greatly simplified. But it can also be commercially available tires 9 with the wheel module 1 be retrofitted.

LIST OF REFERENCE NUMBERS

1

wheel module

2

Tire tread

3

Side facing the tire tread side of the wheel module

4

Inside of the tire tread

5

fastener

6

stringer

7

cross brace

8th

back positioning

9

tires

10

fixing bracket

11

elastic band

12

Patch or patch

13

recesses

a

centrifugal acceleration

B

Bending moment

G

acceleration of gravity

L

Longitudinal direction of the wheel module

Q

transversely

r

Longitudinal radius of the wheel module

R

Rolling radius of the tire

S

Scheuer place

V

speed

X

direction of travel

Claims (7)

Wheel module (1) which can be fastened to an inner side (4) of a running surface (2) of a tire (9) via fastening means (5), wherein a side (3) of the wheel module facing the running surface (2) of the tire (9) (1) is arched at least in the longitudinal direction (L) of the wheel module (1), which corresponds in particular to a direction of travel (X), wherein at least one skid-shaped longitudinal strut (6) is provided on the wheel module (1), characterized in that Fastening means (5) at least one elastic band (11) is provided, wherein the elastic band (11) is threaded through the wheel module (1) and fixed at one end to the wheel module (1) and the elastic band (11) with another End is attached to the tire (1). Wheel module (1) to Claim 1 , characterized in that a longitudinal radius (r) of the wheel module (1) is smaller than a rolling radius (R) of the tire (9). Wheel module (1) according to one of the preceding claims, characterized in that at least one, in particular bar-shaped, cross-brace (7) is provided on the wheel module (1). Wheel module (1) according to one of the preceding claims, characterized in that the wheel module (1) comprises a pressure sensor which is provided in the vicinity of the side facing the running surface (2) (3). Wheel module (1) according to one of the preceding claims, characterized in that the elastic band (11) is fastened with one end to the wheel module. Wheel module (1) according to one of the preceding claims, characterized in that the at least one elastic band (11) via fixing means (8, 10) on the wheel module (1) can be fastened. Wheel module (1) according to one of the preceding claims, characterized in that the wheel module (1), the at least one fastening means (5, 11) and the fixing means (8, 10) are arranged on a patch or patch (12) on the tire (9) attachable, preferably vulcanizable, is.

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