FR3089887A1 - PERMANENT MAGNET RING - Google Patents

Abstract

The invention relates to a ring (1) delimited by an external envelope comprising an annular support (2) equipped with chambers (3), each chamber (3) receiving a permanent magnet (4), characterized in that the chambers (3) are open on the outer envelope. Figure 1

Description

Description

Title of the invention: PERMANENT MAGNET RING

Technical area

The present invention relates to a ring with permanent magnets, in particular intended to be mounted on a tank filler neck.

Prior art

We know vehicles equipped with a urea injection system in the exhaust line to reduce nitrogen oxide emissions. Such vehicles can be light vehicles or even heavy vehicles. In the case of heavy goods vehicles, standards exist which require that the nitrogen oxide reducing tank is equipped with a magnet at the level of its filling neck, which magnet has the role of triggering the opening of a filling gun inserted into the filling neck. This prevents nitrogen oxide reducer from being mistakenly introduced into the vehicle's fuel tank because the nitrogen oxide reducer gun thus actuated by a magnet would remain closed when placed by mistake at the inlet of the fuel tank. fuel. Certain light vehicles or passenger vehicles are fitted with such a magnet in order to allow urea filling with a heavy duty urea filling gun.

This magnet can be replaced, for example from document US20140367390 by a ring comprising several magnets. However, in the ring described by document US20140367390, the magnets are completely enveloped by the material of the ring, which complicates the manufacture of such a ring.

There is therefore a need to improve this ring so as to simplify manufacture.

Summary of the invention

To achieve this objective, there is provided according to the invention a ring delimited by an external envelope comprising an annular support equipped with chambers, each chamber receiving a permanent magnet, characterized in that the chambers are open on the external envelope .

The technical effect is to have a ring that is easier to manufacture because the positioning and maintenance of the magnets is better ensured before adding the support.

Various additional characteristics can be provided, alone or in combinations:

In one embodiment, the outer envelope comprises two parallel annular surfaces, each chamber being open on an annular surface.

In one embodiment, each chamber is open on each annular surface.

In one embodiment, the outer casing comprises an inner cylindrical surface and a means of indexing said ring arranged on this inner surface.

In one embodiment, the chambers and their permanent magnets are distributed regularly around the ring over an angular range less than 270 °.

In one embodiment, the support consists of two half-rings, interconnected by a fixing means.

In one embodiment, the fixing means is of the tenon-mortise type.

In one embodiment, each half-ring is identical and includes a tenon and a mortise.

In one embodiment, the support is made of thermoplastic.

The invention also relates to an assembly comprising a filling neck of a tank, characterized in that it comprises a ring according to any one of the preceding claims arranged around this filling neck.

Brief description of the drawings

Other features and advantages will appear on reading the following description of a particular, non-limiting embodiment of the invention, made with reference to the figures in which:

[Fig.l] shows in front view and in cross section A-A an embodiment of a ring according to the invention.

[Fig.2]: shows another embodiment of the ring according to the invention.

[Fig.3]: shows another embodiment of the ring according to the invention.

Description of the embodiments

Figure 1 shows a ring 1. This ring 1 is materially delimited by an external envelope. More specifically, this external envelope consists of an external cylindrical surface, Salt and an internal cylindrical surface, Sc2. These two surfaces are concentric, the diameter of the cylinder of the internal surface, Sc2 being less than that of the cylinder of the external surface Sel. The end edges of the cylinders, Sc2, Sel are connected by two parallel annular surfaces Sal and Sa2.

The ring 1 is formed of an annular support 2. To facilitate manufacture, this support 2 is preferably molded in thermoplastic such as Polypropylene (PP), polyamide (PA). This annular support comprises chambers 3. Each chamber 3 receives a permanent magnet 4.

The permanent magnets can be Neodymium-based magnets, which have the advantage of being efficient.

As illustrated in Figure 1, the magnets 4 present in the form of a parallelepiped inserted in their chamber 3. Alternatively, the chambers 3 and their magnets could be cylindrical. However the parallelepiped geometry presents the best performance for the magnet.

The ring 1 is intended to be mounted at the level of a filling neck of a tank, for example a filling tank of nitrogen oxide reducer. The function of ring 1 is to trigger the opening of a filling gun inserted into the filling neck.

According to the invention, these chambers 3 are open on the external envelope, which allows mounting by insertion of the permanent magnets 4. The insertion of the permanent magnets 4 in their chamber 3 can be a force insertion. As a variant, the positioning of the magnets 4 is ensured in the injection mold before the addition of the thermoplastic.

In this embodiment, the chambers 3 receiving their permanent magnet 4 are open on an annular surface. In order to facilitate the mounting of the magnets, provision can be made for each chamber 3 to pass through the support 2 and therefore for each chamber 3 to be open on each annular surface Sal, Sa2, which allows air to escape easily from the chamber 3 when its magnet 4 is mounted therein.

In the embodiment of Figure 1, nine magnets are regularly distributed all around the ring 1, in other words over an angular range of 360 °. In another exemplary embodiment, as illustrated in FIG. 2, provision can be made to regularly distribute the magnets 4 over an angular range, a, less than 360 °, for example less than 270 °. This allows the number of magnets 4 to be reduced and their distribution to be optimized as a function of the possible position of the filling gun in the filling neck. Indeed, the gun can in practice be hampered by the presence of a filling hatch placed on the side of the filling neck and therefore of the ring 1.

In particular in the case where the magnets are not regularly distributed all around the ring 1, it is necessary to correctly position the ring 1 relative to the filling neck. Also, in order to freeze the relative position of the ring 1 relative to the filling neck, one can provide on the ring 1 an indexing means placed disposed on the internal surface, Sc2, which will cooperate with a complementary means present on the filling neck. As shown in FIG. 2, this indexing means can be in the form of an element 5 in relief, here projecting from the internal surface, Sc2, but which could be hollow, like a groove.

In order to facilitate the mounting of the ring 1 on the filling neck, it is also possible, as shown in FIG. 3, to provide a ring 1 in two parts. In this example, the support 2 consists of two half-rings 6, 6 ’, connected together by a fixing means. This fixing means can be a clipping system. An example of fixing means illustrated in FIG. 3 is a fixing means of the mortise tenon type. In FIG. 3, the tenons 7 and 7 ’are all on the same half-ring 6, while the mortises intended to receive the tenons are all on the other half-ring 6’ (not visible). This makes it possible to associate the two parts 6, 6 'directly on the filling neck and to facilitate the positioning of the ring 1. As a variant, in order to manufacture only one type of half ring, one could have on each half ring a tenon and a mortise, the two parts 6, 6 'would then be identical.

The use of a thermoplastic ring 1 in particular allows these indexing and / or fixing means to be integrated.

The invention has the advantages of being more economical and lighter than a ring formed of a single magnet. The invention also makes it possible to improve the ease of assembly.

Claims (1)

Claims [Claim 1] Ring (1) delimited by an external envelope comprising an annular support (2) equipped with chambers (3), each chamber (3) receiving a permanent magnet (4), characterized in that the chambers (3) are open on the outer envelope. [Claim 2] Ring (1) according to claim 1 characterized in that the outer envelope comprises two parallel annular surfaces (Sal, Sa2), each chamber (3) being open on an annular surface. [Claim 3] Ring (1) according to claim 2, characterized in that each chamber (3) is open on each annular surface (Sal, Sa2). [Claim 4] Ring (1) according to any one of the preceding claims, characterized in that the external envelope comprises an internal cylindrical surface (Sc2) and an indexing means (5) of said ring (1) disposed on this internal surface ( Sc2). [Claim 5] Ring (1) according to any one of the preceding claims, characterized in that the chambers (3) and their permanent magnets (4) are distributed regularly around the ring (1) over an angular range (a) of less than 270 ° . [Claim 6] Ring (1) according to any one of the preceding claims, characterized in that the support (2) consists of two half-rings (6, 6 ’), connected together by a fixing means. [Claim 7] Ring (1) according to the preceding claim, characterized in that the fixing means is of the tenon (7, 7 ’) - mortise type. [Claim 8] Ring (1) according to the preceding claim, characterized in that each half-ring (6, 6 ’) is identical and comprises a tenon and a mortise. [Claim 9] Ring (1) according to any one of the preceding claims, characterized in that the support (2) is made of thermoplastic. [Claim 10] Assembly comprising a filling neck of a tank, characterized in that it comprises a ring (1) according to any one of the preceding claims arranged around this filling neck. 1/1