FR3058201A1 - PERFECTED BANJO FITTING AND SPRING ASSEMBLY COMPRISING SAME - Google Patents

Abstract

The present invention relates to a banjo connector (1) comprising a tube portion and a grommet portion (12) which is located at one end of the tube portion and which has two end faces (14). At least one end face (14) has an annular projection (13) defining a bearing surface (132) for radial crimping of a sealing washer (3) on the annular projection (13). The present invention also relates to a connection assembly comprising such a banjo fitting (1), a hollow fixing screw and at least one sealing washer (3) crimped radially on an annular projection (13) of the banjo fitting (1).

Description

Holder (s): ASSEMBLY AND BRAZING COMPANY Simplified joint-stock company.

Extension request (s)

Agent (s): CABINET CHAILLOT.

64 / IMPROVED BANJO CONNECTION AND CONNECTION ASSEMBLY INCLUDING IT.

FR 3 058 201 - A1

The present invention relates to a banjo fitting (1) comprising a tube part and an eyelet part (12) which is situated at one end of the tube part and which has two end faces (14). At least one end face (14) has an annular projection (13) defining a bearing surface (132) allowing a radial crimping of a sealing washer (3) on the annular projection (13). The present invention also relates to a connection assembly comprising such a banjo fitting (1), a hollow fixing screw and at least one sealing washer (3) crimped radially on an annular projection (13) of the banjo fitting (1).

IMPROVED BANJO CONNECTION AND LE CONNECTION KIT

UNDERSTANDING

The present invention relates to the field of tight connection, in particular between a casing and a liquid pipe, and relates in particular to an improved banjo connection.

A banjo fitting is in the form of a part comprising a tube part, through a first end of which the end of a liquid pipe will be introduced, and an eyelet part at the second end of the tube part and perpendicular to the latter. The eyelet part is intended to be crossed by a fixing screw which will be screwed into a bore of the casing. The fixing screw is a hollow screw which has radial openings which, in the position of use, open facing the inside of the eyelet, so that the liquid arriving from the liquid line flows into the tube part enters the eyelet then, via the radial openings, into the hollow screw from which it exits through its end screwed into the bore of the casing.

At present, the sealing of the connection between the liquid line and the casing is ensured by two sealing washers which are each compressed against a respective flat end face of the eyelet: a first washer is compressed between the screw head and a first end face while the second washer is compressed between the second end face and the casing. Such an arrangement makes it possible to avoid any leakage of liquid when it flows from the liquid pipe to the hollow screw.

This first solution the caps are discarded

Reference may be made to FIG. 1 in which a banjo fitting according to the present invention is represented, but which also has the characteristics mentioned above.

For reasons of ease of assembly and logistics, these banjo fittings are usually delivered pre-assembled captively with the washers already in position.

One solution for making the washers captive consists in using a disposable plastic cap comprising a ring part which is placed under the second washer, a tab part extending from the ring part and a plug part which is located at the end of the tongue part and that is fixed on the free end of the hollow screw by folding the tongue part.

has several drawbacks when fitting the fittings and therefore generate an unnecessary unnecessary cost and a significant amount of waste, they do not guarantee that the second washer is retained on the fitting after the cap has been removed and they can also come off easily from the fitting during transport.

In order to overcome the drawbacks of disposable caps, it has been proposed to crimp axially against the end faces of the eyelet part specific washers, such as lug washers, notched washers, double washers, etc. Mention may thus be made of French patent FR 2 986 053 B1, which discloses a lug washer consisting of a ring, the interior space of which comprises a main diameter and at least one lug projecting towards the interior space of the ring. The washer is fitted onto a small annular protuberance which has each end face of the eyelet part. The annular protuberance has a low height compared to the thickness of the washer, so that the contact between the two is made on a small surface.

Although they make it possible to overcome certain drawbacks of disposable caps, such as the quantity of waste or the easy detachment of the caps during transport, the use of such specific washers does not make it possible to reduce the cost of the connection as a whole, the additional cost generated by the disposable caps being simply replaced by that associated with the custom machining of the specific washers.

Furthermore, the operations of crimping the washers overcoming them to be proposed may lead to deformations which may affect in particular their hardness and their flatness, which will compromise the tightness of the connection. The present invention aims at the problems described above and thus solution for making captive the washers of a banjo fitting while guaranteeing the good sealing of the fitting, and this at a reduced cost.

The solution according to the present invention is based on the use of simple sealing washers, as opposed to the specific sealing washers mentioned above which are provided with characteristics in addition to the annular shape of the washers, which sealing washers simple are crimped radially on an annular projection which has an end face of the eyelet part of the fitting.

The use of simple sealing washers reduces costs, since they are already commercially available. Radial crimping makes it possible on the one hand to make the sealing washers captive in a safe manner and, on the other hand, to avoid the flatness defects of the sealing washers that are encountered with axial crimping.

The present invention therefore relates to a banjo fitting comprising a tube part and an eyelet part which is situated at one end of the tube part and which has two end faces, characterized in that at least one end face has an annular projection defining a surface allowing a radial crimping of a sealing washer on the annular projection.

Preferably, an annular projection will be provided on each end face of the eyelet part.

Advantageously, the or each annular projection has a minimum height of 0.6 mm, preferably between 0.8 and 1 mm, which ensures reliable radial crimping of the sealing washer on the annular projection. This height is measured along the direction perpendicular to the respective end face of the eyelet part.

Preferably, the or each annular projection has, preferably at its base, a groove for receiving a part of the material of a sealing washer during the radial crimping of the latter on the annular projection.

The groove can have a minimum height of 0.4 mm, preferably between 0.6 and 1 mm.

The groove can be formed by a frustoconical surface, which frustoconical surface preferably constitutes said bearing surface.

The angle between the frustoconical surface of the groove and the respective end face of the eyelet part of the banjo fitting can be between 70 ° and 80 °, preferably is 75 °.

The or each annular projection may have a chamfer at its free edge of larger diameter.

The present invention also relates to a connection assembly comprising a banjo connection, a hollow fixing screw and at least one sealing washer, the banjo connection comprising a tube part and an eyelet part which is located at one end of the part. tube and which has two end faces against at least one of which is placed a sealing washer, the hollow fixing screw passing through the eyelet part, characterized in that the banjo fitting is as defined above and that at least one sealing washer is crimped, by radial crimping, on the surface of an annular projection of the banjo fitting.

Preferably, the internal diameter of the at least one sealing washer is slightly greater than an external diameter of the annular projection, for example with a maximum clearance of 0.2 mm.

The connection assembly according to the present invention may of course comprise two sealing washers, each placed against a respective end face of the eyelet part and a sealing washer being situated between the screw head of the hollow screw of fixing and the respective end face.

Preferably, the inside diameter of each sealing washer is slightly greater than an outside diameter of the annular projection, so as to allow the operator to position the sealing washer without difficulty on the annular projection before crimping.

To better illustrate the object of the present invention, a preferred embodiment will be described below, by way of illustration and without limitation, with reference to the appended drawing.

On this drawing :

- Figure 1 is a perspective view of a connection assembly according to the present invention;

- Figure 2 is a longitudinal sectional view of the banjo fitting according to a preferred embodiment of the present invention;

- Figure 3 is a detail view of Figure 2, showing part of an annular projection for radial crimping of a sealing washer; and

- Figures 4 and 5 are schematic perspective views showing the connector and examples of radial crimping means, during a radial crimping operation; and

- Figure 6 is a view similar to Figure 3, schematically illustrating the sealing washer crimped on an annular projection of the banjo fitting.

If we refer first to Figure 1, we can see that there is shown a connection assembly according to the present invention, which comprises a banjo fitting 1, a hollow fixing screw 2 and two washers seal 3, used to seal a liquid pipe C to a casing (not shown), the passage of the fluid entering and leaving the connection assembly being represented by arrows.

The banjo fitting 1 conventionally comprises a tube part 11 and an eyelet part 12 and will be described in more detail below.

The hollow fixing screw 2 is a conventional hollow screw, comprising a screw head 21, a hollow rod 22 and open at its free end intended to be screwed into a bore of a casing, and radial openings 23 communicating the inside of the hollow rod 22 and the interior space delimited by the eyelet part 12.

The sealing washers 3 are simple sealing washers, namely in the form of an annular part having, in the undeformed state, a smooth inner cylindrical surface, a smooth outer cylindrical surface and two end faces. flat.

A first sealing washer 3 is located between the screw head 21 and the eyelet part 12 and a second sealing washer 3 is located on the other side of the eyelet part 12.

The present invention is not limited to specific configurations of the tube part 11 or of the interior of the eyelet part 12, which will therefore not be described in detail.

The banjo connector 1 according to the present invention differs from the conventional banjo connector described above by the presence of two annular projections 13, each on a respective end face 14 of the eyelet part 12, as can be seen in the Figures 2 and 3. The annular projections 13 are made in one piece with the eyelet part 12.

The annular projections 13 each delimit an interior space forming part of the openings 121 of the eyelet part 12 through which the fixing screw 2 passes through the eyelet part 12. A chamfer can be produced at the internal end edge of each projection 13, to facilitate the introduction of the fixing screw 2 into the eyelet part 12, the latter being able to be introduced through one or other of the openings 121.

Each annular projection 13 has an end face 131 flat and parallel to the respective end face 14, and a surface 132 defined by the outer side of the annular projection 13 and extending between the outer edge, of larger diameter. , from the end face 131 and the respective end face 14. In particular, the bearing surface 132 is formed, starting from the respective end face 14, by a frustoconical surface forming a groove 133 whose function will be explained below.

The angle between the span 132 and the respective end face 14 is for example 75 ° and the height of the span 132, measured along a direction perpendicular to the respective end face 14, can be 0 , 5 mm.

It is emphasized here that the annular projections 13 will be dimensioned to allow a radial crimping of a sealing washer thereon, and that the dimensioning will therefore take account of the characteristics of the sealing washer to be crimped, such as for example the material and thickness of the sealing washer, as well as characteristics of the radial crimping operation itself, such as for example the force to be applied to crimp the sealing washer. Therefore, the dimension values given herein are only examples which do not limit the scope of the present invention.

The choice of material for the sealing washers must also take account of this radial crimping, and for example its hardness must be low enough to allow it to deform and conform to the shape of the bearing surface defined by the projection annular. Copper can be mentioned as an example of a material for the sealing washer.

The radial crimping operation of the sealing washers 3 on the annular projections 13 can be carried out by any suitable means, such as for example by two movable jaws M, as illustrated diagrammatically in FIG. 4, or by two shells C as illustrated diagrammatically in Figure 5, the jaws M or the shells C being movable relative to each other in a plane perpendicular to the axis of the eyelet, in a direction represented by arrows. Each shell C is configured to come into contact simultaneously with a part of the two sealing washers 3 on each side of the eyelet part 12.

Thus, the shells C allow the two sealing washers 3 to be crimped simultaneously, while with the movable jaws M they are crimped one after the other.

FIG. 6 schematically illustrates a sectional view of a sealing washer 3 after such a radial crimping on an annular projection 13, a figure in which it can be seen that the sealing washer 3 has been deformed so as to filling the groove 133, thereby improving the strength of the sealing washer 3 on the annular projection 13 and therefore the reliability of the crimping.

The sealing washer 3 is also in abutment against the respective end face 14, face 14 ίο against which it can be compressed either by the screw head 21, or by the casing, to guarantee good sealing of the connection.

There is also an essential advantage of radial crimping: it makes it possible to obtain a uniform crimping force over the entire sealing washer 3, namely equal over the entire circumference thereof, so that a sufficient effort to guarantee that the sealing washers 3 are mounted captively on the banjo fitting 1 without, however, the flatness of the end faces of the sealing washers 3 being affected by the crimping operation, which here again, it ensures the good sealing of the connection.

It is understood that the embodiment

particular who just was describes has been give to title indicative and not limiting and only modifications can be made without deviates for as much of frame of the present invention. We might as well provide, by example, all other shape and / or position for the throat, or more

of a throat.

π

Claims (7)

1 - Banjo fitting (1) comprising a tube part (11) and an eyelet part (12) which is located at one end of the tube part (11) and which has two end faces (14), characterized by the fact that at least one end face (14) has an annular projection (13) defining a bearing surface (132) allowing a radial crimping of a sealing washer (3) on the annular projection (13). 2 - Banjo fitting (1) according to claim 1, characterized in that the or each annular projection (13) has a minimum height of 0.6 mm, preferably between 0.8 and 1 mm. 3 - Banjo fitting (1) according to one of claims 1 and 2, characterized in that the or each annular projection (13) has, preferably at its base, a groove (133) for receiving a part of the material a sealing washer (3) during the radial crimping of the latter on the annular projection (13). 4 - Banjo fitting (1) according to claim 3, characterized in that the groove (133) has a minimum height of 0.4 mm, preferably between 0.6 and 1 mm. 5 - Banjo coupling (1) according to one of claims 3 and 4, characterized in that the groove (133) is formed by a frustoconical surface, which frustoconical surface preferably constitutes said bearing surface (132). 6 - Banjo fitting (1) according to claim 5, characterized in that the angle between the frustoconical surface of the groove (133) and the end face (14) respective of the 12 (12) from banjo fitting (D part eyelet is comprised between 70 ° and 80 °, from preference is 75 ⁰ . 7 Connection banjo (D according to one of claims 1 to 6, characterized by the makes that the or each annular projection (13) presents a chamfer to his free edge of larger diameter 8 - Together connection including a banjo fitting (1), a hollow fixing screw (2) and at least one sealing washer (3), the banjo fitting (1) comprising a tube part (11) and an eyelet part (12) which is located at one end of the tube part (11) and which has two end faces (14) against at least one of which is placed a sealing washer (3), the hollow fixing screw (2) passing through the eyelet part (12), characterized in that the banjo fitting (1) is as defined in any one of claims 1 to 7 and that the at least one sealing washer (3) is crimped, by radial crimping, on the surface (132) of an annular projection (13) of the banjo fitting (1). 9 - connection assembly according to claim 8, characterized in that the inside diameter of the at least one sealing washer (3) is slightly greater than an outside diameter of the annular projection (3). 1/2 133 I * ™ ¹¹ 1 g » Z