阅读说明：本技术 用于加工共同燃料管路的分支接管的孔的棱边的方法和这样制造的共同燃料管路 (Method for machining an edge of a bore of a branch connection of a common fuel line and common fuel line produced in this way ) 是由 C·马索 P·阿利奥 L·泰斯蒂 于 2019-09-30 设计创作，主要内容包括：本发明涉及一种用于加工接管(2)的径向孔(21)的棱边的方法,该接管用于使喷射喷嘴与内燃机的喷射系统的共同的燃料管路(100)的轴向腔室(11)分支,其中,根据所述方法使径向孔(21)到所述共同燃料管路的腔室(11)中的通口去毛刺。通过磨削所述径向孔(21)到所述轴向腔室(11)中的通口的棱边(22)来制造呈根据孔(21)的轴线(ZZ)的旋转表面(3S)形式的连接环圈(3),所述棱边从所述轴向腔室(11)的表面(11S)和所述径向孔(21)的表面(21S)突出。(The invention relates to a method for machining the edge of a radial bore (21) of a connecting piece (2) for branching off an injection nozzle from an axial chamber (11) of a common fuel line (100) of an injection system of an internal combustion engine, wherein according to the method a passage of the radial bore (21) into the chamber (11) of the common fuel line is deburred. A connecting collar (3) in the form of a surface of revolution (3S) according to the axis (ZZ) of the bore (21) is produced by grinding the edge (22) of the radial bore (21) to the opening in the axial chamber (11), said edge projecting from the surface (11S) of the axial chamber (11) and from the surface (21S) of the radial bore (21).)

1. A method for machining the edge of a radial bore (21) of a connecting piece (2) for branching an injection nozzle from an axial chamber (11) of a common fuel line (100) of an injection system of an internal combustion engine, wherein according to the method a port of the radial bore (21) having an axis (ZZ) into the chamber (11) of the common fuel line is deburred,

wherein the method is characterized in that the connection collar (3) is produced in the form of a surface comparable to a surface of revolution (3S) according to the axis of rotation (ZZ) produced by a generatrix with an apex (S, Sv) lying on the axis (ZZ) by grinding the edge (22) of the radial hole (21) to the through opening in the axial chamber (11), said edge projecting from the surface (11S) of the axial chamber (11) and from the surface (21S) of the radial hole (21).

2. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

the vertex (S) is fixed, the vertex being the intersection of the generatrix (31G) with the axis (ZZ).

3. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

the vertex (Sv) is adjusted on the edge (22), said vertex being the intersection of the generatrix (31gv) and the axis (ZZ).

4. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

the connecting ring (3) is produced by the busbar (31g, 31gv, 41g, 51g, 61g, 71g), wherein:

-one end (32a) is a point located on the surface (21S) of the radial hole (21),

-the other end (33a) is a point on a surface (21S) of the axial chamber (21),

-the relative position of these ends (32a, 33a) on the surface (21S, 11S) of the radial hole (21) and on the surface of the axial chamber (11) determines the effect of the connecting collar (3) on the surface (21S) of the radial hole (21) and on the surface (11S) of the axial chamber (11), respectively.

5. The method for processing according to claim 4,

it is characterized in that the preparation method is characterized in that,

the generatrix (31g, 41g, 51g, 61g, 71g) is a combination of a circular arc, a straight line, a section with a concave curvature with respect to the axis (ZZ), a concave and convex curvature section, which are convex with respect to the axis (ZZ).

6. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

residual compressive stresses are induced in the surface (3S) of the connecting ring (3).

7. The method for processing according to claim 6,

it is characterized in that the preparation method is characterized in that,

the residual compressive stress is caused by the tool for producing the connecting ring (31).

8. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

the surface of the connecting loop (3) is made with a width of at least between 0.1mm and 0.5 mm.

9. The method for processing according to claim 1,

it is characterized in that the preparation method is characterized in that,

said generatrix is a straight line having a slope of between 40 ° and 55 ° with respect to said axis (ZZ).

10. Common fuel line of an injection system obtained according to the method of any one of the preceding claims, said fuel line being constituted by a body (1) provided with an axial chamber (11), into which axial chamber (11) opens a radial hole (21) of a nipple (2) integrated into said body (1) for branching an injection nozzle,

it is characterized in that the preparation method is characterized in that,

the through openings of the radial bores (21) comprise a connecting ring (3) at the junction of each radial bore (21) with the axial chamber (11) of the common fuel line (100) for branching off the injection nozzle from the chamber (11) of the common fuel line (100).

11. The common fuel line of claim 10,

it is characterized in that the preparation method is characterized in that,

the surface (3S) of the connecting ring (3) has, at least in regions, a residual compressive stress in the material of the body (1) of the common fuel line (100).

12. The common fuel line of claim 10,

it is characterized in that the preparation method is characterized in that,

the upper edge (32) and the lower edge (33) of the surface (3S) of the connecting ring (3) reach the surface (21S) of the hole (21) and the surface (11S) of the hole (11) with the fillet, respectively.

Technical Field

The invention provides a method for producing a common fuel line of an injection system, consisting in producing a fuel line body by hot forging and drilling a cavity according to a main axis and producing radial bores for injection nozzle branches, wherein according to the method the bores are deburred to ports in the cavity of the common fuel line.

Background

The very strong pressure variations of the fuel subject the common fuel line of the injection system to a strong fatigue, which creates a risk of breakage at the connection of the radial bore with the chamber of the fuel line.

It is known to deburr the through openings of the radial bores of the common fuel line in order to reduce the risk of failure.

However, there is still a certain degree of fatigue with the risk of breakage and of shutdown of the motor fed by the fuel line.

Disclosure of Invention

The object of the present invention is to develop a method which improves the fatigue behavior of the common fuel line of the injection system. The object of the invention is also to develop a fuel line of an injection system, which fuel line is obtained by means of such a method.

For this purpose, the invention proposes a method for machining the edge of a radial bore of a connecting piece for branching off an injection nozzle from an axial chamber of a common fuel line of an injection system of an internal combustion engine, wherein according to the method a port of the radial bore which opens into the chamber of the common fuel line is deburred.

According to the invention, the method is characterized in that the connection collar is produced in the form of a surface comparable to a surface of revolution according to the bore axis, which is produced by a generatrix with an apex on the axis of revolution, by grinding the edges of the passage of the radial bore into the axial chamber, said edges projecting from the surface of the axial chamber and the surface of the radial bore.

The surface of the connecting ring at the passage of each radial bore into the chamber of the common fuel line makes it possible to distribute the effect of the periodic pressure variations in the fuel line in such a way that concentration of this effect on the edges is avoided, as is the case with the edges that are simply deburred according to the prior art.

The method for machining is further characterized in that the connecting ring is produced by a busbar, wherein:

one end is a point located on the surface of the radial hole,

the other end is a point on the surface of the axial chamber,

the relative position of the ends on the surface of the radial bore and on the surface of the axial chamber determines the influence of the connecting collar on the surface of the radial bore and on the surface of the axial chamber, respectively.

The generatrix thus creates a surface of generally truncated cone shape, since it encloses a determined angle with respect to the axis of the radial hole.

According to another advantageous feature, the generatrix is a circular arc, rectilinear segment, line, segment with concave curvature with respect to the axis of the radial hole, combination of concave and convex curved segments.

In a particularly advantageous manner, residual compressive stresses are induced at least locally in the surface of the connecting loop. This residual compressive stress is caused in particular by the tool used to produce the connecting ring.

According to another advantageous feature, the surface of the connecting loop has a width of between at least 0.1mm and 0.5 mm.

Advantageously, the angle formed locally by the generatrix is determined as a function of the residual compressive stress to be introduced into the surface of the connecting loop.

The residual stress itself depends on the material and operating conditions of the fuel line and in particular on the yield limit of the material of the fuel line.

According to another advantageous feature, the generatrix is a straight line having a slope of between 40 ° and 55 ° with respect to the axis of rotation.

Advantageously, as explained, the tool that makes the joint ring induces residual compressive stresses in the surface of the ring during the same process. This residual compressive stress reduces the fatigue effects of strong periodic pressure variations in the common fuel line.

The overall angle of the connecting collar is advantageously between 40 ° and 55 °, which results in an optimum distribution of the cyclic stresses applied to the surface of the collar during operation of the fuel line. This distribution is optimal for the residual resistance and the risk of pre-damage of the machining area at the junction of the radial hole with the hole of the axial chamber.

The invention also provides a common fuel line of an injection system obtained by the method as explained above, wherein the fuel line is constituted by a body provided with an axial chamber into which opens a radial bore of a nipple integrated into said body and used for branching off an injection nozzle or other accessory of the fuel line.

The ports of the radial bores, which branch off the injection nozzle from the chamber of the common fuel line, comprise a connecting ring at the junction of each radial bore with the axial chamber of the common fuel line.

Advantageously, the upper and lower edges of the surface of the connecting collar reach respectively the surface of each radial hole and the surface of the axial hole of the chamber with the fillet.

Drawings

The invention will be described in more detail below with the aid of an embodiment of a common fuel line having a connecting collar in the form of a surface of revolution on a connecting edge between a radial bore and an axial chamber, which is shown on an enlarged scale in the following figures, which show:

FIG. 1 is a cross-sectional view of a common fuel line according to the present disclosure;

fig. 2 shows, before the method of the invention is used, in sub-fig. 2A, 2B of fig. 2, on the one hand, an axial cross-sectional view through a plane containing the axis of the axial chamber and the axis of the radial bore, of the common fuel line at the level of the radial bore, and on the other hand, a cross-sectional view through a plane perpendicular to the axis of the axial chamber, which plane extends through the axis of the radial bore;

FIG. 3

In its partial fig. 3A, 3B, which corresponds to the sectional plane of fig. 2A, 2B, a first general embodiment of a connection loop according to the invention at the edge of two holes is shown;

in its sub-figures 3C, 3D, a second embodiment of a connecting loop is shown at the edge of two holes, which is adjusted at the intersecting edges;

fig. 4 shows in its sub-drawings 4A, 4B a sectional view, corresponding to the sectional plane of fig. 2, of a further embodiment of a connecting ring on the edge of the radial bore and the axial cavity, said connecting ring having a generatrix in the form of a convex line with two sections;

fig. 5 shows in its sub-drawings 5A, 5B a sectional view according to a sectional plane corresponding to that of fig. 2 of a further embodiment of a connecting loop according to the invention, which is produced by a convexly curved busbar;

fig. 6 shows in its sub-drawings 6A, 6B a sectional view of another embodiment of a connecting loop according to a sectional plane coinciding with the sectional plane of fig. 2, said connecting loop being produced by a busbar combining a shape in the form of a concave curved arc and a shape in the form of a convex curved arc;

fig. 7 shows in its sub-drawings 7A, 7B a sectional view of a further embodiment of a connecting loop according to a sectional plane corresponding to the sectional plane of fig. 2, said connecting loop having a generatrix in the form of a concave line which is formed by two segments.

Detailed Description

According to fig. 1, the invention provides a method which makes it possible to improve the fatigue behavior of the common fuel line 100 of the injection system according to fig. 1. The common fuel line 100 is constituted by a hot forged body 1 in which axial chambers 11 are drilled, the axial chambers 11 receiving fuel at a very high pressure for feeding the injection nozzles. The fuel line comprises an integrated nozzle 2 with radial bores 21 which open into the axial chamber 11 of the body 1 in order to receive the line end connected to the injection nozzle.

The fuel line 100 comprises a plurality of integrated nozzles 2, which depend on the number of injection nozzles to be supplied and the number of inputs required for the high-pressure pump. The end 101 typically includes a pressure sensor; the other end 102 of the fuel line receives a pressure limiter or regulator which returns excess fuel to the accumulator via an outlet connection 103. The ends 101 and 102 may also receive a plug or an additional mouthpiece identical to the mouthpiece 2 if one or the other of the above parts is not necessary or provided in another way. These various accessories are not shown.

Since the production of the radial bore produces a sharp edge and leaves a burr at the connection to the axial chamber 11, this edge is machined as described below with the tool for producing the connecting collar 3.

Fig. 2 shows the state of the edge 22 of the bore 21 leading into the axial chamber 11 in its partial fig. 2A, 2B by a cross section through the common fuel line 100 through two perpendicular planes containing the axis ZZ of the radial bore 21:

sub-figure 2A is a cross-section through a plane containing the axis ZZ and the axis XX of the axial hole 11,

sub-figure 2B is a cross-section through a plane containing the axis ZZ and a transverse axis YY, which is the axis XX perpendicular to the direction of the axial hole 11.

The intersection of the radial bore 21 with the axial bore 11 is a fourth order three-dimensional intersection curve 22(X, Y, Z), wherein all two bores are considered cylindrical surfaces having circular cross-sections 21S, 11S. Because the diameter of the radial bore 21 is smaller than the diameter of the axial bore 11, in the side sectional view of fig. 2A the radial bore 21 "descends" into the axial bore 11, whereas in the sectional view of fig. 2B the intersection curve 22 "is contained" in the surface 11S of the axial bore 11 and merges with the circular arc of the cross-section of the surface 11S of the chamber 11. The "highest" generatrix of the surface 11S (cylindrical surface produced by a straight line) bears the reference Xo-Xo.

In the following description, use is made of cross-sectional views through two perpendicular planes according to the sub-drawings 2A, 2B of fig. 2.

In order to simplify the explanation of the figures and the description of the method, it is useful to designate four intersections (22B, 22H) of the curve 22 with the two sectional planes. The difference in height (e) between the two lower points 22B and the two upper points 22H of the curve 22 (difference in height according to the axis ZZ) is also clearly highlighted.

The dimensions of the hole 21 and the axial chamber 11 are not to scale but are greatly exaggerated in order to simplify the figures and curvilinear geometries of the present invention. The same applies to the elements in the figures relating to the connecting loop 3 described in its different embodiments. Finally, the terms "up/down" and "right/left" relate only to the orientation of the figures.

Fig. 3 shows two embodiments of the method, which consists in producing the connecting collar 3 in the form of a surface comparable to the rotating surface 3S (according to the axis ZZ), which is referred to as the axis of rotation of the radial bore 21, by grinding the edge 11 of the through opening of the surface 11S which opens into the axial chamber 11.

The connecting ring 3 is produced as a surface produced by a straight or curved generatrix as explained, and the apex S of this surface lies on the axis ZZ.

In the simplest first case, the apex S is fixed to the axis of rotation ZZ. The connecting collar is produced, for example, by a tool which schematically has an edge formed by a generatrix and which rotates about the axis ZZ.

In the second case, the rotary generatrix is adjusted at the intersecting edge 22; this adjustment can be made by physically following the edge 22 or by following a theoretical intersection curve 22 according to the two surfaces 11S, 21S (which are cylindrical surfaces with a circular cross section). In the second case, the "vertex" Sv of the surface (which is the intersection of the generatrix with the axis ZZ) is not fixed, but moves on the axis of rotation ZZ according to a path corresponding to the difference in height (e) of the edge 22.

In the first case, as an example, the intersection of the generatrix with the surface 21S is circular, while in the second case the geometric position of this intersection with the surface 21S is a curve offset from the curve constituting the edge 22. Because the height difference (e) is small, the ground surface resembles a rotating surface.

Since the representation of the method according to the first case is geometrically simpler, this delineation (beschreibrung) is performed first, since the vertex S of the cone generated by the generatrix is fixed, and the delineation of the second case is to some extent an extrapolation of the first delineation.

Fig. 3A, 3B show a first embodiment of a connecting ring 3, which is a surface of revolution 3S produced by a generatrix 31g, rotating about an axis ZZ and bounded by an upper point 32P and a lower point 33P. The generatrix 31g intersects the axis of rotation ZZ at a point S forming the vertex of the cone of rotation generated by the generatrix. The upper point 32P describes a circle 32 on the surface 21S, while the lower point 33P describes a circle in a plane perpendicular to the axis ZZ. However, this circle 33 is not the lower edge 34 of the connecting girdle 3 and it only overlaps the lower edge 34 in the plane ZZ/XX (fig. 3A). This generatrix 31g of the surface of revolution 3S is, for example, the active surface (intersecting edge) of a rotary tool of the milling type, which engages with the radial hole 21 and then develops therein, so as to superimpose the intersecting curve 22 of the radial hole 21 with axis ZZ on the surface 11S of the axial chamber 11 with axis YY.

The generatrix 31g joins the surface 21S of the radial hole 21 by forming a circular upper edge 32 of the connecting collar 3, delineated by a point 32P.

The lower edge 34 of the surface 31S of the connecting collar 3 is a curve described by the intersection of the generatrix 31g with the surface 11S of the axial bore 11 (the point of extension 34P), which is also always the angular position of the generatrix 31g about the axis of rotation ZZ, since this intersection is by definition located on the surface 11S.

In other words, the lower end 33P of the generatrix 31g describes a circle in a plane perpendicular to the axis ZZ, on the contrary, the extension point 34P is located at the intersection of the generatrix 31g with the surface 11S during the rotation of the generatrix 31g about the axis ZZ (assumed to be contained in a plane extending through the axis ZZ); during the rotation of the generatrix, said extension point moves on the section 33P-34Po of the generatrix 31g between the lowest point 33P and the highest intersection point 34 Po.

The curve 34 is shown in cross-section in the side cross-sectional view of fig. 3A. This curve corresponds to the type of three-dimensional ellipse with two planes of symmetry; in projection in the plane XX, ZZ (fig. 3A), the curve is highly compressed at the lowest point (33Po) and at the highest point (34Po) (fig. 3A).

It is expediently to be noted that the figures used in this description are limited to cross sections through two planes XX/ZZ and YY/ZZ, respectively, in the outermost position corresponding to the generatrix 31 g; intermediate positions which have to be shown in a complicated manner in the sectional view complicate the view.

Figures 3A, 3B are divided into two parts passing through the axis ZZ in order to simplify the illustration and the geometry with a dimensional auxiliary line between figures 3A, 3B.

The right part of figure 3A shows a cross section of the surface 3S with a generatrix 31g in the plane XX/ZZ, the rounded shape of the upper edge 32 of this truncated conical surface 3S of the connecting girdle 3 and the three-dimensional curve 34 of the lower edge.

The left part of fig. 3A shows a generatrix 31g with two ends 32P and 33P in the plane XX/ZZ and an extension point 34P at the highest intersection of the straight lines Xo-Xo of the surface 11S. In this position, the extension point 34P carries the reference numeral 34 Po.

The intersecting edges 22 have been shown in order to show the widening of the rotating surface 3S above and below this line 22, which widening disappears by the production of the connecting loop 3.

The right part of fig. 3B shows a cross-sectional view before the edge 22 is ground. Since the edges 22 intersect in the surface 11S, the projection of the edge into the plane YY/ZZ is an arc of a circle bounded by the lower point 22B and reaching two upper points 22H meeting on the generatrix Xo-Xo.

The left part of fig. 3B shows a bus bar 31g, an end 32P of the bus bar on the surface 21S, and an end 33P of the bus bar on the surface 11S. In these two outermost positions, the point 33P bears the reference 33 Po. The right part of fig. 3B shows the drop in the plane YY/ZZ (Abgang) of the land 22.

The two curved arrows illustrate the continuation of the extension point 34P on the surface 11S, which rises to the upper straight line Xo-Xo by the rotation of the generatrix 31 g.

Fig. 3C, 3D show sectional views corresponding to a second embodiment of the method, according to which the intersection point Sv of the generatrix 31gv with the axis of rotation ZZ at the intersection edge 22 is adjusted. This can be schematically illustrated by: the point of intersection Sv moves on the axis ZZ on a path having a length (e) equal to the difference in height of the curve of the edge 22.

This means that the upper point 32P of the generatrix 31gv, i.e. the intersection of the generatrix with the surface 21S, is no longer moving on the circle 32, but on the curve 22V, which corresponds to a translation of said curve 22 according to the height H. This height is visible in fig. 3C. This translation means that the rotation of the generatrix 31gv is combined with the translation of the length (e).

An intersection 34P of the generatrix 31gv and the surface 11S draws a curve 34v included between the curve 22 and the curve 34 of the generatrix 31g of the first embodiment; this curve 34 is plotted in fig. 3C for comparison.

Thus, the surface of the resulting ring 3Sv is slightly reduced with respect to the surface of the ring 3S with the generatrix 31g of the fixed apex S. The difference between these two surfaces is reduced even further than the actual fabrication of these surfaces in very small dimensions compared to the surfaces of fig. 3A-3D.

In the case of a conical surface with a fixed apex, different variants are described below, wherein the use in the case of a surface produced by a generator adjusted at the edge 22 can be easily derived therefrom.

Fig. 4A, 4B show, under the same conditions of the diagram as described above, a generatrix 41g in the form of a convex line with respect to the axis ZZ, consisting of two straight segments 41g1, 41g2 meeting at a point 41g 3.

For simplicity of description, the bus bar 41g is shown in conjunction with the bus bar 31g of fig. 3A, 3B; the preceding reference numerals have been reserved, except for modified elements, if possible.

The generatrix 41g cuts the edge 22 according to a rotating bicone about the axis ZZ; the two portions 3S1, 3S2 of the bicone forming a surface of revolution about the axis ZZ of the coupling collar 3 intersect by a rounded edge 35(2D curve) when the connection point 41g3 is above the surface 11S or by a 3D curve when the connection point 41g3 is below the upper line Xo-Xo and turns around on the surface 11S. The curve described by the point 41g3 in this case is formed by an arc of a circle about the axis ZZ, starting from the position shown in fig. 4B until the point 41g3 contacts the surface 11S and the segments (41g3-41g1) start to enter into the surface 11S. From this position, the curve is part of a curve of the generatrix (41g4-32P) depicted by the extension point 41g4 (extension point 41g4 thus corresponds to point 33P of the generatrix 31g) and therefore has a curve shape similar to the curve 34 of fig. 3A, 3B, but smaller. The combination of the curved arcs generated by point 41g3 is symmetrical about the two cutting planes XX/ZZ and YY/ZZ as all curves of the different figures.

The lower edge 44 of the bicone 3S (3S1, 3S2) is a three-dimensional curve having a shape resembling a three-dimensionally deformed, compressed ellipse that reaches the inside of the curve 34 on the line Xo-Xo in an upper position 44Po from the side of the point 34Po shown as the orientation point and by being tangent to the two lowermost points 33Po on the surface 11S.

Fig. 5 shows, in its sub-fig. 5A, 5B, the case of a busbar 51g, which is delimited by an upper point 32P and a lower point 33P, which are identical to the busbar 31 described above, which intersects the edge 22.

Expediently, it should be noted that the generatrix starting from point 33P is at the most tangential to the surface 11S.

If the generatrix has to intersect the surface 11S at its closest position to this surface 11S (according to fig. 5B), for example by passing through the surface 11S into the axial chamber 11 in order to exit again from this surface at the point 331P (fig. 5B), it will be sufficient to use the portion between the points 331P and 32P as generatrix instead of the generatrix 51g between the points 32P and 33P.

This will result in lower edge 541 being closer to curve 22 than edge 54.

For comparison, fig. 5A shows bus bars 51g and 511g and curves 54 and 541.

The surface 3S is a tapered surface produced by a curved generatrix about the axis ZZ, wherein convexity is defined here with respect to the axis ZZ.

Fig. 6 shows in its sub-figures 6A, 6B a generatrix 61g consisting of two curved arcs 61g, 61g2, one of which is convex with respect to the axis of rotation ZZ and the other of which is concave with respect to the axis of rotation ZZ. The generatrix produces a conical surface 3S with a double curvature.

Fig. 7 shows in its sub-drawings 7A, 7B a surface of revolution 3S, which is produced by a concave generatrix 71g, wherein the combination of two straight line segments 71g, 71g2 meet at a point 71g 3.

As in the previous example, the resulting surface 3S is bounded by an upper edge 32 in the shape of a circular arc in the surface 21S and a lower edge 74 formed by a fourth-order 3D curve. The 3D curve is far from the curve 34 of the busbar 31g shown for comparison.

The surface 3S of the connecting ring 3 produced by the different busbars 31g-71g given as a non-limiting example can be machined with a tool with busbars or with a different tool in order to induce residual stresses therein.

Likewise, the raised edges of surface 3S (e.g., upper edge 32 and lower edges 34, 44, 54, 64, 74) may be weakened by fillets.

It is also appropriate to note that the overall angle of the generatrix, i.e. the angle of the straight line connecting the ends 32P, 33P of the generatrix, is preferably an angle between 40 ° and 55 °.

The angle of the busbar section, for example busbar 41g or busbar 71g, is preferably between 25 ° and 40 °.

Finally, the width of the surface 3S produced by the generatrix behind the hole edge 22 is preferably in the order of 0.1-0.5mm between the narrowest and widest part. This width is the distance between points 32P and 34P (extension points), which is a section of variable length that produces a generatrix joining the surfaces 3S of the loops.

List of reference numerals

100 common fuel line

101 end/axial chamber port of fuel line

102 end of fuel line/end of receiving pressure limiter

103 output connection pipe

1 hot forged body

11 axial cavity

11S surface of axial Chamber

2 Integrated adapter

21 radial hole

Surface of 21S radial hole

22 edge/intersection curve to be deburred

3 connecting ring

3S swivel surface of connecting ring

31g, 41g, 51g, 61g, 71g bus

32 upper edge of the surface of revolution

Upper point of 32P bus

33 curve drawn by the lower point 33P of the generatrix

Lower point of 33P bus

34 lower edge of surface of revolution 3D

34P intersection/extension of generatrix and surface 21S

35 curve depicted by the connection point of two bus-sections

S fixed vertex

Sv movable vertex

Axis/axis of rotation of ZZ radial bore