JP2009154700A - Electronic unit for measuring operational parameter of wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic unit capable of bearing even a substantial high stress and having an electronic module of which the size and weight are reduced to optimum values. <P>SOLUTION: The electronic unit for use in measuring operational parameters of a wheel has an outer wall forming a lateral installed housing for an assembly head of an inflation valve, the lateral installed housing is defined by a metallic plate integrally formed with an electronic module, and the metallic plate is used for pushing against a fixed surface of the assembly head and has a recess for passing through a body of the inflation valve. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic unit for measuring the operating parameters of a wheel, comprising an electronic module and an inflation valve for fixedly mounting the electronic module to a wheel rim.

  An increasing number of automobiles are equipped with a system for parameter monitoring and / or measurement, including sensors mounted on the vehicle.

  One example of such a system is a monitoring system in which an electronic module is attached to each wheel. These electronic modules are dedicated modules that measure parameters such as the pressure and / or temperature of the tires mounted on the wheels and are intended to notify the driver of any abnormal changes in the measured parameters .

  One of the most common solutions currently used to attach an electronic module to a wheel rim is an electronic module and an inflation valve coupled to the electronic module for fixed attachment to the wheel rim. Is to produce an electronic unit composed of

  In addition, each electronic module typically has an external “eyelet”, each inflation valve having a body designed to extend through the eyelet and an orifice formed in the rim, and an inflation valve on the wheel rim. The assembly head is separated from the body by a shoulder that forms a surface for fixing.

  Thanks to such a design, it is possible to obtain a screw torque that reliably holds the electronic module in the correct position, even though considerable stress (centrifugal force, vibration, acceleration, etc.) is applied to the electronic module.

  However, in order to transmit force, the electronic module has to be extremely stiff, thus complicating the electronic module.

  Furthermore, due to the principle of assembling the inflation valve on the electronic module, it is necessary to place a dead volume exclusively for mounting the inflation valve, which makes the electronic module significantly oversized and overweight.

  The present invention aims to eliminate these drawbacks, the main problem of which is an electronic unit comprising an electronic module that can withstand fairly large stresses and is optimally reduced in size and weight. Is to provide.

  The above-described problem is an electronic unit for measuring the operating parameters of a wheel, and includes an electronic module and an inflation valve for fixing the electronic module to a wheel rim. The inflation valve is formed in the wheel rim. In an electronic unit of the type consisting of a body extending through a defined orifice and an assembly head separated from the body by a shoulder forming a surface for securing the inflation valve to the wheel rim, the electronic module comprises: Having an outer wall, the outer wall defining a horizontal housing for the assembly head of the inflation valve, the horizontal housing being delimited by a metal plate formed integrally with the electronic module, the metal plate being A Solved by an electronic unit for measuring operating parameters of a wheel, for pressing a fixed surface of the assembly head, comprising a notch for passing through the body of the inflation valve .

  The subject of the present invention is an electronic unit comprising an electronic module and an inflation valve for fixing the electronic module to a wheel rim. The inflation valve is a body extending through an orifice formed in the wheel rim, and the inflation The assembly head is separated from the body by a shoulder that forms a surface for fixing the valve to the wheel rim.

  According to the invention, the electronic unit has an outer wall that forms a horizontal housing for the assembly head of the inflation valve, the horizontal housing being defined by a metal plate that is integrally formed with the electronic module, The metal plate is for pressing the fixed surface of the assembly head, and has a notch for passing the body of the inflation valve.

  According to the present invention, since the assembly head is pressed against and fixed to the metal plate, it is possible to generate a motion chain for force transmission consisting of only the contact between the metal portions, so that the screw torque can be maintained. It can certainly be increased.

  Further, since the assembly head can be inserted directly into a horizontal housing designed to receive the assembly head, a dead zone is not required for mounting the inflation valve. Thus, the dimensions and weight of the electronic module are optimized.

  According to an advantageous embodiment of the invention, the shape of the notch in the metal plate forms a holding means for the body of the inflation valve extending through this notch.

  According to this configuration, it is possible to obtain a pre-assembly of two members of each electronic unit, and in particular, storage and management of the electronic module until the electronic module is attached to the rim is facilitated.

  Also, since the shape of the notch forms the inflation valve holding means, in order to insert the inflation valve body into the notch and hold it there, the inflation valve body has an oblique inclination. Note that it must be. However, since this mounting operation does not require any specific dead volume, the dimensions of the electronic module are not affected by such mounting.

  Furthermore, in an advantageous embodiment of the invention, the electronic module is plastic molded and the metal plate is made of an insert that is overmolded during the manufacture of the electronic module.

  Furthermore, one opening is preferably provided on each side of the cutout of the metal plate, each suitable for closing when the electronic module is molded.

  Furthermore, the fixing surface of the metal plate and the assembly head preferably has a cylindrical contact surface, which allows the electronic module to be moved relative to the longitudinal axis of the inflation valve before the inflation valve is fixed to the wheel rim. It is possible to adjust the tilt. Thanks to such a connection, it is possible to adjust the position of the electronic module according to the contour of the rim, in particular for the purpose of limiting the application of stress by keeping the electronic module in contact with the bottom of the rim. Become.

  According to another advantageous embodiment of the invention, the notch of the metal plate has a section that increases in thickness from the bottom of the notch to each end of the notch. Since the thickness is variable in this way, a cam profile that is particularly useful for preventing tilting of the electronic module due to the action of centrifugal force can be obtained.

  Furthermore, in order to stiffen the electronic module, the electronic module has a transverse wall bordered by a barb on the outer periphery, on which two parallel external ribs go into the two feeds. It extends and a metal plate extends between the ends of the two feeds, so that a transverse housing is defined by the metal plate, the feed and the return of the outer periphery.

  In addition, the inflation valve normally has an axial ventilation duct that opens in a surface called a rear surface on the opposite side of the fixed surface of the assembly head. In order to facilitate the passage of air through this ventilation duct, a horizontal housing is used. Preferably has two internal ribs protruding into the transverse housing. These two internal ribs are formed to form two linear pressure surfaces with respect to the rear surface of the assembly head, and are arranged so as to extend on both sides of the outlet of the ventilation duct.

  According to the present invention, it is possible to fix (and remove) a module and an inflation valve quickly and very easily. In particular, these two members are simply nested and held in place before they are finally clamped with simple holding means. The fastening of the assembly (module + valve) and the final (but also reversible) fastening is performed only when the valve is fastened to the rim with a normal nut. Therefore, the module is placed on the module easily and at a very low cost.

  Other features, objects, and advantages of the present invention will become apparent from the following detailed description with reference to the accompanying drawings. However, the attached drawings show advantageous embodiments of the invention as non-limiting examples.

  The electronic unit according to the invention, shown by way of example in the figure, can be mounted on a wheel for the purpose of measuring the operating parameters (pressure, temperature, acceleration, etc.) of the wheel and transmitting the measurement data to a central unit mounted on the vehicle. Designed.

  This electronic unit is composed of an electronic module 1 suitable for mounting in a tire casing and an inflation valve 2. The inflation valve 2 is used for fixing the electronic module to a rim of a wheel on which the tire is mounted. , Connected to the electronic module.

  First, the inflation valve 2 is formed as a single part and has a cylindrical body (FIG. 2) connected to the assembly head 4. An axial ventilation duct 5 that opens to the rear surface 9 of the assembly head 9 passes through the body and the assembly head.

The body 3 of this inflation valve 4 is also formed from two cylindrical longitudinal sections having the following different diameters:
A small diameter tip section 6 whose tip is threaded to attach a cap 26 (FIG. 3) for closing the ventilation duct 5 (FIG. 1);
An intermediate section 7 leading to the assembly head 4 in which the tip 7a is threaded in order to attach the electronic unit to the rim as well.

  On the other hand, since the assembly head 4 of the inflation valve 2 has a width larger than the diameter of the intermediate section 7 and a height substantially equal to the diameter, the body 3 has a shoulder 8 that forms a lateral surface called a fixed surface. It is divided into two half faces 8a and 8b which are separated and symmetrically divided on both sides of the body.

  Further, each of the two half faces 8a and 8b has a rounded shape suitable for turning the inflation valve 2 about an axis perpendicular to the axis of symmetry V thereof.

  The rear surface 9 of the assembly head 4 comprises a flat surface on an axis inclined by about 130 ° with respect to the longitudinal axis of the inflation valve 2.

  On the other hand, the electronic module 1 of this electronic unit is composed of an actual module 10 and a metal insert 11 that defines the housing of the assembly head 4 of the inflation valve 2.

Furthermore, the module 10 is plastic molded, and the insert 11 is overmolded when the electronic module is manufactured.
First, the module 10 consists of a hollow casing, which is designed to house the “electronic components” of the electronic unit and is formed by a transverse wall 13 bordered by a barb 14 at the outer periphery. ing.

  Furthermore, two parallel external ribs 15, 16 are arranged on the transverse wall 13, and these ribs extend into two feeds 17. Each carry 17 is adapted in shape during molding to define a groove to be inserted by overmolding one of the ends of the insert 11.

As shown in the figure, the two feeds 17, the insert 11 and the barbs 14 are arranged to define a transverse housing 12 that is shaped to accommodate the assembly head 4.
For this purpose, the length 14 b (FIG. 3) of the barb 14 corresponding to the housing 12 forms an inclined surface in a pair with the rear surface 9 of the assembly head 4. Note that the length 14a (FIG. 2) of the barb 14 is perpendicular to the transverse wall 13.

  Finally, the horizontal housing 12 has two internal ribs 19 which are arranged in the horizontal housing in such a way as to project against the barbs 14b, these internal ribs being two linear shapes relative to the rear face 9 of the assembly head 4. The pressure surface is defined and extends on both sides of the outlet 5a (FIG. 3) of the ventilation duct 5.

  Finally, the insert 11 (FIG. 2) consists of a metal plate for pressing the fixed surface 8 of the assembly head 4 of the inflation valve 2 and has a notch 20 through which the body 3 of the inflation valve passes.

  Furthermore, the shape of this notch 20 forms a means for holding the intermediate section 7 of the body 3 of the inflation valve 2 extending through this notch.

  Finally, the notch 20 has a section 20a that increases in thickness from the bottom of the notch to each end 20b of the notch.

  The insert 11 has support surfaces 21 rounded into a convex shape for receiving and pressing the fixing surface 8 of the assembly head 4 on both sides of the notch 20.

  Finally, the insert 11 has two openings 22, which are arranged one on each side of the notch 20, so that they are closed when the electronic module is molded. It extends into the “groove” 18.

  The electronic module 1 and the inflation valve 2 of the electronic unit according to the invention are first accommodated in the transverse housing 12 by virtue of the shape of the notch 20 (which also forms the holding means). Preassembled at position.

  It should be noted that in such an installation of the inflation valve 2, the assembly head 4 can be inserted directly into the lateral housing 12 designed to receive the assembly head by tilting the assembly head 4. So there is no need for a dead zone. Thus, the dimensions and weight of the electronic module 1 are optimized.

  In order to attach the electronic unit to the rim 23, an annular seal 28 (FIG. 3) is arranged around the middle section 7 of the body 3 and after the body has been installed in a bore normally located in the rim. This annular seal compressed between the rim 23 and the insert 11 is (at least partially) housed in a metal cup (not shown). Thus, only the metal parts are in contact with each other while the seal is tightened between the rim and the insert.

  The inclination of the electronic module 1 is adjusted according to the angle a that defines the contour of the rim. This is mainly for holding the electronic module in the recess 24 that forms the bottom of the rim 23.

  Finally, the electronic unit is fixed by screwing a (metal) nut 27 onto the threaded tip 7a of the intermediate section 7 of the body 3.

  When this fixing is completed, the assembly head 4 is pressed against the insert 11 and fixed. Therefore, the motion chain for transmitting force consists only of contact between the metal parts, and the maintenance of the screw torque can be reliably increased.

  Furthermore, since the assembly head can be inserted directly into a horizontal housing designed to house the assembly head, no dead zone is required for mounting the inflation valve 2. Thus, the dimensions and weight of the electronic module 1 are optimized.

  The “dead zone” is formed in the module 10 only for receiving the valve head, for example, when a through-hole is opened in the module for accommodating the inflation valve 2 therein, and an electronic component is placed therein. It means a zone that cannot be entered. In accordance with the present invention, the portion of the module that contains the electronic components is sized only to receive these electronic components. A zone 12 for receiving the valve head (and thus for connecting the valve to the module) is located outside the electronics compartment (sideways in the example shown).

FIG. 3 is a perspective view of an electronic unit according to the present invention. It is an exploded perspective view of this electronic unit. It is sectional drawing which shows this electronic unit attached to the rim | limb of the wheel.

Claims (8)

  An electronic unit for measuring the operating parameters of a wheel, comprising an electronic module (1) and an inflation valve (2) for fixing the electronic module to a wheel rim (23). 2) is separated from the body (3) by a body (3) extending through an orifice formed in the wheel rim (23) and a shoulder (8) forming a surface for fixing the inflation valve to the wheel rim. In the electronic unit of the type constituted by the assembly head (4), the electronic module (1) has outer walls (13, 14), and the outer walls (13, 14) are inflation valves (2). A horizontal housing (12) for the assembly head (4) of the The ring (12) is delimited by a metal plate (11) formed integrally with the electronic module, and the metal plate (11) is for pressing the fixing surface (8) of the assembly head, Electronic unit for measuring the operating parameters of a wheel, characterized in that it comprises a notch (20) for passing the body (3) of the inflation valve.   2. Electronic unit according to claim 1, wherein the shape of the notch (20) of the metal plate (11) forms a holding means for the body (3) of the inflation valve (2) extending through the notch.   Electronic unit (1) according to claim 1 or 2, wherein the electronic module (1) is plastic molded and the metal plate (11) comprises an insert that is overmolded during the manufacture of the electronic module.   The electronic unit according to claim 3, wherein one opening (22) is formed on each side of the notch (10) of the metal plate (11) to be closed when the electronic module (1) is formed. .   The fixed surface (8) of the metal plate (11) and the assembly head (4) has a cylindrical contact surface (21), and the inflation valve is fixed to the wheel rim (23) by the contact surface (21). 5. The electronic unit according to claim 1, wherein the inclination of the electronic module (1) relative to the longitudinal axis of the inflation valve (2) can be adjusted before being done.   6. Electronic unit according to claim 5, wherein the notch (20) of the metal plate (11) has sections (20a, 20b) that increase in thickness from the bottom of the notch to each end of the notch.   The electronic module (1) has a transverse wall (13) bordered by an outer barb (14) on which two parallel external ribs (15, 16) are transported by two (17) extending between the ends of the two feeds (17), so that the horizontal housing (12) has the metal plate, 7. Electronic unit according to any one of the preceding claims, defined by a carry and a return (14) of the outer periphery.   The inflation valve (2) is penetrated by an axial ventilation duct (5) that opens to a surface (9) called a rear surface opposite to the fixed surface (8) of the assembly head (4). (12) has two internal ribs (19) protruding into the transverse housing, the two internal ribs (19) being two in relation to the rear surface (9) of the assembly head (4). The electronic unit according to claim 7, wherein the electronic unit is formed so as to form a straight pressure surface and extends on both sides of the outlet (5 a) of the ventilation duct (5).

Images