GB2594991A

GB2594991A - Valve stem, tyre parameter monitoring system and method for mounting a tyre parameter monitoring system onto a wheel rim or a vehicle

Info

Publication number: GB2594991A
Application number: GB2007200.5A
Authority: GB
Inventors: Druta Paul; Atabasoe Llie
Original assignee: Continental Automotive GmbH
Current assignee: Continental Automotive GmbH
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-11-17
Anticipated expiration: 2040-05-15
Also published as: GB202007200D0; GB2594991B

Abstract

Valve stem specially designed for mounting a tyre parameter monitor system (TPMS), having a radially enlarged portion 24 and a mounting portion 26 corresponding to the electronic module 4. The air hole 32 may be tilted such that its outlet 36 is at an inclined angle, and its inlet 38 is further upstream, to ensure that the length of the internal threads 28 can be maximised, to accommodate for a longest screw 8 possible, improving load bearing capacity. There may be a gasket 34 and a nut 44 for fastening and sealing the valve stem. The screw 8, which may be solid, may fasten the electronic module 4 to the valve stem. The electronic module may include a tyre pressure sensor. The second aspect relates to a method of mounting the TPMS to a wheel rim.

Description

VALVE STEM, TYRE PARAMETER MONITORING SYSTEM AND METHOD FOR MOUNTING A TYRE PARAMETER MONITORING SYSTEM ONTO A WHEEL RIM 5 OF A VEHICLE The present invention relates to a valve stem, a tyre parameter monitoring system and to a method for mounting a tyre parameter monitoring system onto a wheel rim of a vehicle.

A tyre parameter monitoring system (TPMS) typically includes an inflation valve for introducing or removing air from the tyre and an electronic module which includes a sensor unit or measuring one of more parameters of the tyre. The inflation valve is positioned in a bore or hole in the wheel rim and the electronic module is arranged inside the tyre and is coupled with the inflation valve. Such a system may be used to inform the driver of any abnormal variation in the measured parameter, for example the tyre pressure.

One type of tyre parameter monitoring system or tyre pressure monitoring system is known as the snap-in type, in which the inflation valve positioned on the outside of the wheel rim extends through a bore in the wheel rim and is connected to an electronic unit positioned on the inside of the wheel rim by a snap-in connection. Snap-in valves include an elastically deformable stem. An example of such a snap-in system is disclosed in EP 2 818 506 Al.

Another type of tyre parameter monitoring system is known as the clamp-in type. Clamp-in valves are formed of metal or an alloy. For some clamp-in types, the electronic module can be fastened in various angular positions with respect to the wheel rim. An example of such a clamp-in system is disclosed in US 7 059 178 B2.

For other clamp-in types, the electronic module has a fixed angular position with respect to the wheel rim.

It is desirable to simplify assembly of tyre parameter monitoring systems to the wheel rim. An object of the present invention is, therefore, to provide a tyre pressure 35 monitoring system that can be more easily mounted onto a wheel rim.

According to the invention, a tyre parameter monitoring system is provided that comprises an electronic module, a valve stem and a fastener, such as a screw. The electronic module comprises receiving means for receiving a connection section of the valve stem and fastening means to which the valve stem is detachably attachable. The valve stem comprises a valve body comprising a longitudinal axis, an air inlet end for accommodating a valve through which air can be inserted into the tyre and an air outlet end opposing the air inlet end. The air outlet end comprises a substantially cylindrical section that extends radially outwardly from the valve body and a connection section that protrudes from the substantially cylindrical section along the longitudinal axis. The connection section is sized and shaped to be engaged with the receiving means of the electronic module of the tyre parameter monitoring system. The connection section has an inner thread that is engageable by the screw to attach the valve stem to the electronic module. The valve stem comprises at least one air hole that extends at an inclined angle to the longitudinal axis. The least one air hole is used to insert air into the tyre.

To inflate the tyre, air is inserted into the air inlet end of the valve body of the valve stem and exits the valve body via the air hole whereupon it enters the pneumatic tyre. If the screw, which is used to attach the valve stem to the electronic module, is solid, the length of the screw and the position of the air hole within the valve body are arranged such that the screw does not cover or obstruct the air hole in order that air can be inserted into the tyre.

In the mounted position, the air inlet end of the valve stem is positioned adjacent an outer surface of wheel rim and the air outlet end along with the electronic module is positioned on or adjacent to the inner surface of the wheel rim and within the pneumatic tyre. To mount the system onto the wheel rim, the valve stem is first engaged by the screw to the electronic module and then the air inlet end of the valve stem is inserted from the inner surface of the wheel rim through a hole in the wheel rim so that the air inlet end is positioned on the outside of the wheel rim. As a result of this mounting procedure, force can act perpendicularly to the longitudinal axis of the valve body and on the joint between the valve stem and the electronic module which can cause damage to the valve stem.

In order to avoid such damage, the invention provides for an increase in the length of the screw that is used to connect the valve stem to the electronic module.

Typically, a valve stem includes at least one air hole that extends through the wall of the valve body in a direction that is substantially perpendicular to the longitudinal axis of the valve body. This arrangement of the hole is simple to manufacture but has the effect of limiting the maximum possible length of the screw. In order to increase the length of the screw, the length of the inner thread of the connection section has to be increased correspondingly. This, however, would lead to the screw blocking the inlet to air hole. In principle, this obstruction could be avoided by increasing the length of the connection section of valve stem. However, this would lead to an overall increase in the length of the valve stem and of the tyre parameter monitoring system when mounted on the wheel rim. In some designs of wheel rim, insufficient space is available on the inner profile of the wheel rim to accommodate an increase in the length of the connection section.

The invention provides for an increase in the length of the screw used to connect the valve stem to the electronic module without increasing the overall size of the system. In order to have an increased connection length between the screw and the connection section of the valve stem, the invention provides a valve stem in which the angle of the one or more air holes is selected such that the one or more air holes extends at an inclined angle to the longitudinal axis and extends towards the air inlet end at the inclined angle to the longitudinal axis. As used herein, an inclined angle means an angle of less than 90°, for example an angle of less than 85° and greater than 5°. In some embodiments, the inclined angle is around 45°. This enables the distance between the inlet to the air hole, i.e. the end of the air hole that is formed in the surface bounding the inner chamber of the valve body, to be positioned at a greater distance from the end face of the connection section, thus providing a greater length for accommodating a longer screw. This longer length of the screw enables any force of the joint between the valve stem and the electronic module to be better distributed along the valve stem and into the wheel rim, thus providing a more reliable system that can be easily mounted onto the wheel rim. An increase in the length of the connection section and the overall length of the system is not necessary.

In some embodiments, the screw has a length such that in the mounted condition the inlet of the air hole is arranged upstream of the distal end of the screw. The screw may be a solid screw as the inlet to the air holes remains unobstructed by the screw. A solid screw can also be used to provide a greater strength to the joint between the valve stem and the electronic module than a hollow screw.

In some embodiments, the screw has a length such that in the mounted condition the screw engages with the inner thread of the connection section, a distal end of the screw is positioned within the cylindrical section of the valve stem and the head of the screw abuts a flange of the fastening means of the electronic module that bounds the receiving means.

In some embodiments, the connection section is connected to the substantially cylindrical section of the valve body by an inclined section that extends radially outwardly from the connection section towards the substantially cylindrical section. In some embodiments, the at least one air hole has an outlet positioned in the inclined section of the valve stem. The inlet of the air hole is in fluid communication with an inner chamber of the valve body and with the valve positioned in the inner chamber. The surface of the inclined section may be curved and form a cone shape. The cone shape may include one or more flat surfaces. The inclined section may also be formed of a plurality of flat surfaces forming a general cone shape. The cylindrical section maybe considered to be modified to include curved surfaces or flat surfaces which form the inclined section at one side of the cylindrical section.

In some embodiments, the connection section has an overall diameter or dimension which is less than the diameter of the substantially cylindrical section. The valve body has a diameter which is greater than the diameter of the connection section and less than the diameter of the substantially cylindrical section.

In some embodiments, the inlet of the at least one air hole or each inlet of the two or more air holes is arranged upstream of the inclined section. For example, the inlet of the air hole may be arranged within the substantially cylindrical section, or upstream of the cylindrical section or partially upstream of the cylindrical section. As used herein upstream refers to a direction towards the air inlet end of the valve body.

In some embodiments, the cylindrical section comprises a flange that opposes the inclined section. The flange may extend substantially perpendicularly to the longitudinal axis of the valve body. In the mounted position, the flange of the cylindrical section abuts an inner surface of the wheel rim.

In some embodiments, in the mounted position, the substantially cylindrical section, the inclined section, the connection section, the at least one air hole and the electronic module are positioned within the pneumatic tyre.

The connection section of the valve stem is sized and shaped to be engaged with a receiving means of an electronic module the electronic module of the tyre parameter monitoring system. In some embodiments, the receiving means is sized and shaped to engage with the connection element so as to determine or set the angle between the longitudinal axis of the valve body and the electronic module. For example, the connection element may include at least one flat surface which corresponds to a flat surface of the receiving means. In other embodiments, the connection section has a square or hexagonal profile and the receiving means is formed by an elongate opening having a corresponding square or hexagonal profile. The valve stem may have a fixed angular relationship to the electronic module due to the matched and interlocking engagement between the connection section and the receiving means.

The valve stem may be of the clamp-in type and be formed of a metal or an alloy, whereby the valve body has an outer surface formed of metal or an alloy, for example brass.

In some embodiments, the tyre parameter monitoring system further comprises a nut. The valve body comprises an outer thread for engaging with the nut and in the mounted position the nut detachably attaches the valve body to an outer surface of the wheel rim. The valve stem typically includes a valve cap which covers the air inlet end and the valve which is positioned within the valve body.

The electronic module may accommodate a tyre pressure sensor unit.

The according to the invention, a valve stem is also provided. The valve stem comprises a valve body comprising a longitudinal axis, an air inlet end for accommodating a valve through which air can be inserted into the tyre and an air outlet end opposing the air inlet end. The air outlet end comprises a substantially cylindrical section that extends radially outwardly from the valve body and a connection section that protrudes from the substantially cylindrical section along the longitudinal axis. The connection section is sized and shaped to be engaged with a receiving means of an electronic module of a tyre parameter monitoring system and has an inner thread that is engageable by a screw to attach the valve stem to the electronic module. The valve stem comprises at least one air hole that extends at an inclined angle to the longitudinal axis.

In some embodiments, the connection section is connected to the substantially cylindrical section by an inclined section that extends radially outwardly from the connection section to the substantially cylindrical section. In some embodiments, the at least one air hole has an outlet positioned in the inclined section of the valve stem and an inlet in fluid communication with the valve. In some embodiments, the inlet of the air hole is arranged upstream of the inclined section. In some embodiments, the cylindrical section comprises a flange that opposes the inclined section, wherein in the mounted condition the flange abuts an inner surface of the wheel rim.

The invention also provides a method for mounting a tyre parameter monitoring system on a wheel rim of a vehicle. A valve stem is provided including the features of any one of the embodiments described herein. An electronic module including receiving means for receiving the connection section of the valve stem and fastening means for detachably engaging the valve stem to the electronic module is also provided. To mount the tyre parameter monitoring system on the wheel rim, the connection section of the valve stem is engaged with the receiving means of the electronic module. The valve stem is detachably attached to the fastening means of the electronic module using a screw that engages with the inner thread of the connection section. The inlet end of the valve stem is inserted from an inner surface of the wheel rim into a hole in the wheel rim and a nut is detachably attached to an outer thread on the valve body and tightened against the outer surface of wheel rim in order to mount the tyre parameter monitoring system to the wheel rim of a vehicle.

In this method, the valve stem is first attached to the electronic module and then inserted, whilst attached to the electronic module, through the hole in the wheel rim. Therefore, force may act perpendicularly on the valve stem and in particular on the joint formed by the connection section, screw and receiving means, as the valve stem is inserted into the hole. Due to the inclined arrangement of the air holes in the valve body of the valve stem, the length of the screw can be increased which leads to an increase in the strength and robustness of the joint. Consequently, the system can be more simply and reliably mounted to the wheel rim.

In some embodiments, the screw is selected to have a length such that in the mounted position, the screw extends within the cylindrical section of the valve stem and such that the inlet of the air hole is positioned upstream of the screw. The screw may, therefore, be a solid screw and increase the strength of the joint between the valve stem and the electronic module and reduce the likelihood of damage to the system at the joint when inserting the valve stem through the hole in the wheel rim.

Embodiments will now be described with reference to the drawings.

Figure 1 illustrates a perspective exploded view of a tyre parameter monitoring system Figure 2 illustrates a cross-sectional view of the tyre parameter monitor system of figure 1 in the assembled condition.

illustrates a cross-sectional view of the tyre parameter monitor system of figures 1 and 2 mounted on a wheel rim of a vehicle.

Figure 3 Figure 1 illustrates a perspective exploded view of a tyre parameter monitoring system (TPMS) 2, Figure 2 illustrates a cross-sectional view of the tyre parameter monitor system 2 of figure 1 in the assembled condition and Figure 3 illustrates a cross-sectional view of the tyre parameter monitor system 2 of figures 1 and 2 mounted on a wheel rim 50 of a vehicle.

The tyre parameter monitoring system 2 includes an electronic module 4, a valve stem 6 and a screw 8 for detachably securing the valve stem 6 to the electronic module 4. The electronic module 4 includes a housing within which tyre parameter monitoring systems and circuitry, for example a tyre pressure sensor, are accommodated. The electronic module 4 includes receiving means 10 in the form of a receptacle and fastening means 12 to which the valve stem 6 can be detachably secured by the screw 8. The receiving means 10 may be provided by an elongate opening in the housing that is sized and shaped to mechanically engage with valve stem 6. The fastening means 12 may be formed by the portion of the housing bounding the receiving means 10 and comprise a flange which bounds the receiving means 10 and against which the screw 8 can be tightened.

The valve stem 6 includes a valve body 14 comprising a longitudinal axis 16, an air inlet end 18 and an air outlet end 20 that opposes the air inlet end 18. The valve body 14 is elongate and may be generally cylindrical. The valve body 14 is formed of a metal or an alloy and has an outer surface formed by a metal or an alloy.

The air outlet end 20 comprises a substantially cylindrical section 24 that extends radially outwardly from the valve body 14 and a connection section 26 that protrudes from the substantially cylindrical section 24 along the longitudinal axis 16 and that forms the distal end of the valve stem 6. The connection section 26 is sized and shaped to be engaged with the receiving means 10 of the electronic module 4. The connection section 26 may include an outer profile including one or more flat faces which engage with one or more flat faces of the receiving means 10 in order to fix the angle between the valve stem 6 and the electronic module 4 and to provide a mechanical interlocking connection between the valve stem 6 and the electronic module 4. The connection section 26 has an inner thread 28 with which the valve stem 6 is attached to the fastening means 10 of the electronic module by the screw 8.

The connection section 26 is connected to the substantially cylindrical section 24 by an inclined section 30 that extends radially outwardly from the connection section 26 to the substantially cylindrical section 24. The inclined section 30 may have a cone shape and may include one or more flat faces. In some embodiments, the inclined section 30 is formed by inclined faces. A gasket 34 is positioned on the opposing side of the cylindrical section 24 to the inclined section 30 and provides a sealing element. The gasket 34 extends substantially perpendicularly radially outward from the longitudinal axis 16.

The valve stem 6 includes at least one air hole 32 which extends from the inner chamber 42 of the valve body 14 through the wall of the valve body 14. The at least one air hole 32 extends at an inclined angle to the longitudinal axis 16 in the direction of the connection section 26. In the embodiment illustrated in the drawings, the at least one air hole 32 extends at an angle of around 45° to the longitudinal axis 16. In the illustrated embodiment, two holes 32 are provided which are arranged on opposing sides of the longitudinal axis 16.

The outlet 36 of the air hole 32 is positioned in the inclined section 30 of the valve body 14 and the inlet 38 is positioned partly within and partly upstream of the cylindrical section 30. The valve stem 6 includes a valve 56 positioned within the valve body 14 at the air inlet end 18 through which air can be inserted into a non-illustrated tyre via the air inlet end and the air holes 32 at the air outlet end 20. A valve cap 22 may be provided which is attached to, typically screwed onto the air inlet end 18 that covers the valve 56.

The inclined angle of the air holes 32 has the effect that the distance between the end face 40 of the connection section 26 and the inlets 38 of the air holes 32 is increased compared to an arrangement in which the outlet 36 of the air hole 32 is positioned at approximately the same distance from the end face 40 but the air hole 32 extends substantially perpendicularly to the longitudinal axis 16 as indicated with the dashed line 42 in figure 2. This inclined arrangement of the air holes 32 allows the screw 8 to have a longer length without the screw 8 obstructing the inlets 38 to the air holes 32. Therefore, a longer joint between the valve stem 6 and the screw 8 can be provided which is more mechanically robust.

The combination of the inclined section 30 and the inclined angle of the air holes 32 enables the outlets 36 to be positioned adjacent the receiving means 10 and be unobstructed by the electronic module 4.

The tyre parameter monitoring system 2 also includes a nut 44 including an inner 10 thread which is sized and shaped to fit over the body 14 of the valve stem 6 and to engage with an outer thread 46 on the outer surface of valve body 14.

In order to mount the tyre parameter monitoring system 2 on a wheel rim 50, the connection section 26 is inserted into the receiving means 10 of the electronic module 4. The connection section 26 and the valve stem 6 are attached to the electronic module 4 by inserting the connection section 26 into the receiving means 10, inserting the screw 8 from the opposing side of the fastening means 10 and engaging the screw 8 with the inner thread 28 of the connection section 26 that is positioned in the receiving means 10. The air inlet end 18 of the valve stem is then inserted through a hole 58 in the wheel rim 50 from the inner surface 52 of the wheel rim 50, whilst attached to the electronic module 4, and attached to the outer surface 48 of the wheel rim 50 by a nut 44. The tyre parameter monitoring system 2 may also include a further seal or 0-ring positioned between the nut 44 and the outer surface 48 of the wheel rim 50.

Figure 3 shows a cross-sectional view of the tyre parameter monitoring system 2 in the assembled and mounted condition. In the mounted condition, the nut 44 and valve stem 6 are positioned on the outside 48 of the wheel rim 50 and the electronic module 4, connection section 26, cylindrical section 24, inclined section 30 and air holes 32 are positioned on the inside 52 of the wheel rim 50 and within the pneumatic tyre. The substantially cylindrical section 24 of the valve body 15 includes a gasket 34 that opposes the inclined section 30. The gasket 34 of the substantially cylindrical section 24 abuts the inner surface 52 of the wheel rim 50.

As can be seen in figure 3, the wheel rim 50 typically includes a well 54 in which the electronic module 4 is positioned. This well 54 typically has dimensions which are not that much greater than the dimensions of the electronic module 4. Consequently, increasing the length of the joint between the valve stem 6 and the electronic module 4 cannot simply be achieved by increasing the length of the receiving means 10 and the connection section 16, for example, since the well 54 in the wheel rim 50 is insufficiently large to accommodate a larger electronic module 4. Therefore, the tyre parameter monitoring system 2 enables a longer screw 8 to be used with a consequent increase in the strength of the joint between the valve stem 6 and the electronic module 4 and a better distribution of forces on the joint without leading to an increase in the overall size of the system 2.

Results of tests for screws of three different lengths are summarised in table 1.

Sample Screw length dL at Fmax (mm) Fmax (rnrn) (N) 1 8 6.80 407 2 8 4.12 404 3 8 5.32 339 4 10 3.71 548 10 5.20 598 6 10 3.76 590 7 12 5.73 768 8 12 4.02 794 9 12 4.72 784

Table 1

Table 1 shows the results of stress strain tests for screws of different lengths engaged with a valve stem. The length of the screw denotes the nominal length of the screw, i.e. the length from the underside of the head of the screw to the distal end of the threaded portion. The test speed was 10 mm/mm. The maximum Force (Fmax) in N and elongation at fracture (dL) in mm are shown. The average value of Fmax is increased from 383.333 N for a screw having a length of 8 mm to 782 N for a screw having a length of 12 mm.

Claims

Claims 1. A valve stem (6) for a tyre parameter monitoring system (2), the valve stem (6) comprising: a valve body (14) comprising a longitudinal axis (16), an air inlet end (18) for accommodating a valve (56) through which air is insertable into the tyre; an air outlet end (20) opposing the air inlet end (18), the air outlet end (18) comprising a substantially cylindrical section (24) that extends radially outwardly from the valve body (14) and a connection section (26) that protrudes from the substantially cylindrical section (24) along the longitudinal axis (16), wherein the connection section (26) is sized and shaped to be engaged with a receiving means (10) of an electronic module (4) of the tyre parameter monitoring system (2) and has an inner thread (28) that is engageable by a screw (8) to attach the valve stem (6) to the electronic module (4), wherein the air outlet end (20) comprises at least one air hole (32) through which air is insertable into the tyre, wherein the air hole (32) extends at an inclined angle to the longitudinal axis (16).
2. A valve stem (6) according to claim 1, wherein the connection section (26) is connected to the substantially cylindrical section (24) by an inclined section (30) that extends radially outwardly from the connection section (26) to the substantially cylindrical section (24).
3. A valve stem (6) according to claim 2, wherein the at least one air hole (32) has an outlet t (36) hat is positioned in the inclined section (30) of the valve body (14).
4. A valve stem (6) according to claim 3, wherein the inlet (38) of the air hole (32) is arranged upstream of the inclined section (30) of the valve body (14).
5. A valve stem (6) according to one of claims 2 to 4, wherein the cylindrical section (24) comprises a gasket (34) that opposes the inclined section (30), wherein in the mounted position the gasket (34) abuts an inner surface (52) of the wheel rim 35 (50).
6. A tyre parameter monitoring system (2) comprising: a valve stem (6) according to one of claims 1 to 5, an electronic module (4) comprising fastening means (12) to which the valve stem (6) is attachable to the electronic module (4) and receiving means (10) for receiving the connection section (26) of the valve body (14), a screw (8) for detachably securing the valve stem (6) to the fastening means (12) of the electronic module (4).
7. A tyre parameter monitoring system (2) according to claim 6, wherein the receiving means (10) is sized and shaped to engage with the connection section (26) to set the angle between the longitudinal axis (16) of the valve body (14) and the electronic module (4).
8. A tyre parameter monitoring system (2) according to claim 6 or claim 7, wherein the screw (8) has a length such that in the mounted position the screw (8) engages with the inner thread (28) of the connection section (26), a distal end of the screw (8) is positioned within the cylindrical section (24) of the valve body (14) and the head of the screw (8) abuts a flange of the fastening means (12) of the electronic module (4) that bounds the receiving means (10).
9. A tyre parameter monitoring system (2) according to one of claims 6 to 8, 20 wherein the screw (8) is a solid screw.
10. A tyre parameter monitoring system (2) according to one of claims 6 to 9, wherein the length of the screw (8) is such that in the mounted position the inlet (38) of the air hole (32) is arranged upstream of the distal end of the screw (8).
11. A tyre parameter monitoring system according to one of claims 7 to 10, wherein, in the mounted position, the substantially cylindrical section (24), the inclined section (30), the connection section (26), the at least one air hole (32) and the electronic module (4) are positioned within the pneumatic tyre.
12. A tyre parameter monitoring system according to one of claims 7 to 11, further comprising a nut (44), wherein the valve body (14) comprises an outer thread (46) for engaging with the nut (44), wherein in the mounted position the nut (44) detachably attaches the valve body (14) to an outer surface (48) of the wheel rim (50).
13. A tyre parameter monitoring system (2) according to one of claims 7 to 12, wherein the electronic module (4) accommodates a tyre pressure sensor unit.
14. A method for mounting a tyre parameter monitoring system (2) to a wheel rim (50) of a vehicle, the method comprising: providing a valve stem (6), the valve stem (6) comprising: a valve body (14) comprising a longitudinal axis (16), an air inlet end (18) comprising a valve (56) through which air is insertable into the tyre; an air outlet end (20) opposing the air inlet end (18), the air outlet end (20) comprising a substantially cylindrical section (24) that extends radially outwardly from the valve body (14) and a connection section (26) that protrudes from the substantially cylindrical section (24) along the longitudinal axis (14) and has an inner thread (28), wherein the air outlet end (20) comprises at least one air hole (32) that extends at an inclined angle to the longitudinal axis (16); providing an electronic module (4) comprising fastening means (12) to which the valve stem (6) is attachable to the electronic module (4) and receiving means (10) for receiving the connection section (26) of the valve stem (6); engaging the connection section (26) of the valve stem (6) with the receiving means (10) of the electronic module (4); detachably attaching the valve stem (6) to the fastening means (12) of the electronic module (4) using a screw (8) that engages with the inner thread (28) of the connection section (26); inserting the air inlet end (18) of the valve stem (6) from an inner surface (52) of the wheel rim (50) into a hole (58) in the wheel rim (50); detachably attaching a nut (44) to an outer thread (46) on the valve body (14) to mount the tyre parameter monitoring system (2) to the wheel rim (50) of the vehicle.
15. A method according to claim 14, wherein the screw (8) is selected to have a length such that in the mounted position the screw (8) extends within the cylindrical section (24) and such that an inlet (38) of the air hole (32) is positioned upstream of the screw (8).