Vehicle transmission system assembly

Abstract

The invention relates to an assembly (100) intended for a vehicle transmission system comprising: a housing (10) having a body (15) of revolution having an axis X; an annular ring (25) having the axis X as its axis, said annular ring (25) being assembled to the housing (10); wherein the housing (10) and the annular ring (25) comprise contact surfaces (31, 32, 33, 34) including a bearing surface (13, 23, 43, 53), an inclined surface (12, 22, 42, 52), a sloping guide surface (11, 21, 41, 51), and a recess (14, 24, 44, 54) adjacent to the bearing surface (13, 23, 43, 54), the contact surfaces being joined by welding, in particular laser welding. Figure for the abstract: Figure 1

Description

Title of the invention: Assembly for vehicle transmission system

[0001] The present invention relates to an assembly for a vehicle transmission system, particularly for an automotive application.

[0002] In general, a vehicle transmission system assembly comprises components made of materials with a high carbon content. Such a vehicle transmission system assembly is, for example, a differential wheel assembly. The differential wheel assembly comprises a differential housing and a ring gear. The differential housing is made of cast iron. The ring gear is made of steel.

[0003] As is known, surfaces of the differential housing and the ring gear that are to be welded together are pre-machined. However, due to the high carbon content in cast iron and steel, there is a possibility of cold cracking after welding. Therefore, there is a need to resolve the technical problem associated with the assembly described above.

[0004] Consequently, the present provision relates to a set intended to overcome the aforementioned disadvantages and other known provisions.

[0005] The present provision relates to an assembly for a vehicle transmission system comprising a housing having a body of revolution having an axis X; an annular ring having the axis X, said annular ring being assembled to the housing, the housing comprising a first contact surface and the annular ring comprising a second contact surface, the first contact surface being at least partially in radial contact with the second contact surface, the first contact surface and the second contact surface comprising: at least a first bearing surface defined by a cylindrical surface extending axially along the axis X;a first inclined surface extending from at least one first bearing surface and being inclined at a first angle with respect to at least one first bearing surface, a first guiding surface extending from the first inclined surface and being inclined at a second angle with respect to at least one first bearing surface, the first angle being smaller than the second angle, and the first inclined surface being disposed between the first guiding surface and at least one first bearing surface; and a first recess positioned adjacent to at least one first bearing surface and / or the housing comprising a third contact surface and the annular ring comprising a fourth contact surface, the third contact surface being at least; partially in axial contact with the fourth contact surface, the third contact surface and the fourth contact surface comprising: at least one second bearing surface defined by an annular surface extending radially in a direction normal to the X axis; a second inclined surface extending from the at least one second bearing surface and being sloped at a third angle with respect to the at least one second bearing surface; a second guide surface extending from the second inclined surface and being sloped at a fourth angle with respect to the second bearing surface, the third angle being smaller than the fourth angle, and the second inclined surface being disposed between the second guide surface and the second bearing surface; and a second recess positioned adjacent to the at least one second bearing surface.

[0006] By means of the assembly of the first contact surface with the second contact surface, a gap is created by the first inclined surface and the first guiding surface for a welding operation, particularly for a laser welding operation. A portion of the gap adjacent to the first guiding surface serves to guide filler material during the welding operation. Another portion of the gap adjacent to the first inclined surface forms a reservoir for the filler material to achieve an appropriate ratio between the welded parts and the filler material in a weld bead after the welding operation. Consequently, the formation of cold cracks at welded joints in the assembly after the welding operation is minimized. This results in improved performance of the welded joints.

[0007] According to one aspect of the arrangement, the housing comprises a first contact surface and the annular ring comprises a second contact surface, the first contact surface being at least partially in radial contact with the second contact surface, the first contact surface and the second contact surface comprising: at least a first bearing surface defined by a cylindrical surface extending axially along the X axis;a first inclined surface extending from at least one first support surface and being sloped at a first angle α with respect to at least one first support surface, a first guiding surface extending from the first inclined surface and being sloped at a second angle [3] with respect to at least one first support surface, the first angle α being smaller than the second angle [3], and the first inclined surface being disposed between the first guiding surface and at least one first support surface; and a first recess positioned adjacent to at least one first support surface.

[0008] According to one aspect of the arrangement, the first contact surface and the second contact surface comprise the first bearing surface and a third surface The first recess is positioned between the first and third support surfaces. This recess creates a pressure chamber to prevent porosity in the weld bead after welding. This improves the efficiency of the welded joints.

[0009] According to another aspect of the arrangement, the housing includes a third contact surface and the annular ring includes a fourth contact surface, the third contact surface being at least partially in axial contact with the fourth contact surface, the third contact surface and the fourth contact surface comprising: at least a second bearing surface defined by an annular surface extending radially in a direction normal to the X axis; a second inclined surface extending from the at least a second bearing surface and being inclined at a third angle q with respect to the at least a second bearing surface;a second guiding surface extending from the second inclined surface and sloping at a fourth angle θ with respect to the second bearing surface, the third angle θ being smaller than the fourth angle θ, and the second inclined surface being disposed between the second guiding surface and at least one second bearing surface; and a second recess positioned adjacent to at least one second bearing surface.

[0010] According to another aspect of the arrangement, the body of revolution includes a flange extending in a direction normal to the X axis of rotation and away from it, said flange defining the first contact surface and the third contact surface.

[0011] According to another aspect of the arrangement, the third contact surface comprises the second support surface and the fourth contact surface includes a fourth support surface, the second recess is positioned between the second support surface and the fourth support surface.

[0012] According to another aspect of the arrangement, the first contact surface and the second contact surface extend substantially parallel to the X axis, said first contact surface is in radial contact with the second contact surface with respect to the X axis.

[0013] According to yet another aspect of the arrangement, the third contact surface and the fourth contact surface extend substantially normally to the X axis, said third contact surface is in axial contact with the fourth contact surface with respect to the X axis.

[0014] Due to the third contact surface and the fourth contact surface, said gap is provided at another location of said assembly for the purpose of the welding operation.

[0015] According to yet another aspect of the arrangement, the annular ring is a toothed crown comprising a plurality of gear teeth.

[0016] According to yet another aspect of the arrangement, the body of revolution including the flange is a differential housing.

[0017] According to yet another aspect of the arrangement, the first contact surface of the housing is assembled to the second contact surface of the annular ring by welding, in particular by LASER welding.

[0018] According to yet another aspect of the arrangement, the third contact surface of the housing is assembled to the fourth contact surface of the annular ring by a weld, in particular a LASER weld.

[0019] According to another aspect of the arrangement, the present invention relates to a differential device for a vehicle transmission system comprising the assembly configured according to the present arrangement.

[0020] According to one aspect of the arrangement, the present invention relates to a method for making an assembly (100) of a housing (10) and an annular ring (25) for a vehicle transmission system, comprising the following steps:

[0021] provide the annular ring (25) and the case (10) having a body (15) of revolution;

[0022] assemble said annular ring (25) to the housing (10); and

[0023] welding, in particular laser welding, between a first contact surface (31) of the housing (10) and a second contact surface (32) of the annular ring (25), the first contact surface (31) being at least partially in radial contact with the second contact surface (32), the first contact surface (31) and the second contact surface (32) comprising:

[0024] at least a first support surface (13; 23) defined by a cylindrical surface extending axially along the X axis;

[0025] a first inclined surface (12; 22) extending from at least a first support surface (13; 23) and being inclined at a first angle (a) with respect to at least a first support surface (13; 23),

[0026] a first guiding surface (11; 21) extending from the first inclined surface (12, 22) and being inclined at a second angle (|3) with respect to at least one first support surface (13; 23), the first angle (a) being smaller than the second angle (|3), and the first inclined surface (12; 22) being disposed between the first guiding surface (11; 21) and at least one first support surface (13; 23); and

[0027] a first recess (14; 24) positioned adjacent to at least a first support surface (13; 23);

[0028] and / or

[0029] welding, in particular laser welding, between a third contact surface (33) of the housing (10) and a fourth contact surface (34) of the annular ring (25), the third contact surface (33) being at least partially in axial contact with the fourth contact surface (34), third contact surface (33) and fourth contact surface (34) comprising:

[0030] at least a second support surface (43; 53) defined by an annular surface extending radially in a direction normal to the X axis;

[0031] a second inclined surface (42; 52) extending from at least a second support surface (43, 53) and being inclined at a third angle (q) with respect to at least a second support surface (43, 53);

[0032] a second guiding surface (41; 51) extending from the second inclined surface (42, 52) and being inclined at a fourth angle (0) with respect to the second support surface (43, 53), the third angle (q) being smaller than the fourth angle (0), and the second inclined surface (42, 52) being disposed between the second guiding surface (41; 51) and at least one second support surface (43, 53); and

[0033] a second recess (44; 54) positioned adjacent to at least a second bearing surface (43; 53).

[0034] The features, aspects, and advantages of this arrangement can be better understood by referring to the following description and figures. The components in the figures are not necessarily to scale, as the emphasis is rather on illustrating the principles of the arrangement. Furthermore, in the figures, similar reference numbers designate corresponding parts in the drawings:

[0035] Fig. 1 illustrates a cross-sectional view of a vehicle transmission system assembly configured according to the present invention;

[0036] Fig. 2 illustrates a cross-sectional view of a housing with a flange, configured according to the present invention;

[0037] Figure [Fig. 3] illustrates a cross-sectional view of an annular ring configured according to the present invention;

[0038] Fig. 4 and Fig. 6 illustrate a detailed view of I as illustrated in Fig. 1 of the vehicle transmission system assembly configured according to the present invention;

[0039] Fig. 5 and Fig. 7 illustrate a detailed view of II as illustrated in Fig. 1 of the vehicle transmission system assembly configured according to the present invention;

[0040] Fig. 8 is a flowchart schematically illustrating a method for making an assembly for a vehicle transmission system configured according to the present invention;

[0041] The figures are not necessarily to scale, and the size of some parts may be exaggerated to more clearly illustrate the example shown. In addition, the drawings give examples and / or examples in accordance with the description; however, the description is not limited to examples and / or examples given on the drawings.

[0042] Elements that are identical, similar, or analogous retain the same reference from one figure to another. Ordinal numbers are used to differentiate details. They do not define the position of a detail. Therefore, for example, a third detail of a product does not mean that the product has a first and / or a second detail.

[0043] Unless otherwise specified, “axially” means parallel to the X-axis of the axial bore of the housing, “radially” means along a transverse axis intersecting the X-axis of the axial bore, and “circumferentially” means around the X-axis of the axial bore. For ease of understanding, and without limitation, the terms “internal / inside / inside” or “extreme / outside / outside” shall be used with respect to the X-axis and in a radial orientation orthogonal to said X-axis.

[0044] Figure 1 illustrates a cross-sectional view of an assembly 100 intended for a vehicle transmission system. Figure 2 illustrates a cross-sectional view of a housing 10 with a flange 16, configured according to the present invention. Figure 3 illustrates a cross-sectional view of an annular ring 25 configured according to the present invention.

[0045] The description here refers to [Fig. 1], [Fig. 2], and [Fig. 3], which are described collectively for the sake of brevity. Said assembly 100 comprises a housing 10 and an annular ring 25. The housing 10, formed as a body 15 of revolution, has an axis X. Said body 15 of revolution comprises a flange 16 extending in a direction normal to the axis X and away from it. The annular ring 25 has the axis X as its axis. Said annular ring 25 is assembled to the housing 10.

[0046] As illustrated in [Fig.2], the housing 10 comprises a first contact surface 31 disposed on the body 15 of revolution and a third contact surface 33 disposed on the flange 16. As illustrated in [Fig.3], the annular ring 25 comprises a second contact surface 32 and a fourth contact surface 34. Said first contact surface 31 of the body 10 of revolution and the second contact surface 32 of the annular body 25 extend substantially parallel to the axis X. Said third contact surface 33 on the flange 15 and the fourth contact surface 34 of the annular body 25 extend substantially perpendicularly to the X axis.

[0047] Figures 4 and 6 illustrate a detailed view of region I as shown in Figure 1. As illustrated in Figure 4, the first contact surface 31 comprises at least a first bearing surface 13, a first inclined surface 12, a first guiding surface 11, and a first recess 14. Similarly, the second contact surface 32 comprises at least a first bearing surface 23, a first inclined surface 22, a first guiding surface 21, and a first recess 24.

[0048] Referring to [Fig. 5], the at least first bearing surface 13, 23 are defined by a cylindrical surface extending axially along the X axis. The first inclined surface 12, 22 extends from the at least first bearing surface 13, 23 and is sloped at a first angle α with respect to the at least first bearing surface 13, 23. The first guide surface 11, 21 extends from the first inclined surface 12, 22 and is sloped at a second angle θ with respect to the at least first bearing surface 13, 23. The first angle α is smaller than the second angle θ. The first inclined surface 12, 22 is disposed between the first guide surface 11, 21 and at least one first support surface 13, 23. The first recess 14, 24 is positioned adjacent to at least one first support surface 13, 23.The first recess 14, 24 comprises a bottom surface and side walls on either side of the bottom surface defining a depth of the first recess 14, 24.

[0049] As illustrated in [Fig.4], the first contact surface 31 is at least partially in radial contact with the second contact surface 32. In particular, the first bearing surface 13 of the housing 10 is in radial contact with the first bearing surface 23 of the annular ring 25. In one embodiment, the first contact surface 31 and the second contact surface 32 further comprise a third bearing surface 133, 233, the first recess 14, 24 being positioned between the first bearing surface 13, 23 and the third bearing surface 133, 233.

[0050] Furthermore, according to [Fig.4], a radial contact between the first bearing surface 13 in the first contact surface 31 of the body 15 of revolution and the first bearing surface 23 in the second contact surface 32 of the annular ring 25 together forms a gap 60 configured by means of the first inclined surface 12, 22 and the first guiding surface 11,21 for a welding operation, in particular a LASER welding operation. A weld is made in the form of a weld bead in said gap 60 to join the housing 10 and the annular ring 25. Said gap 60 comprises a guide portion 61 and a reservoir portion 62. The guide portion 61 is formed between the first guide surface 11 in the first contact surface 31 of the body of revolution 15 and the first guide surface 21 in the second contact surface 32 of the annular ring 25.The reservoir portion 62 of the gap 60 is formed between the first inclined surface 12 in the first contact surface 31 of the body 15 of revolution and the first inclined surface 22 in the second contact surface 32 of the annular ring 25. The guide portion 61 adjacent to the first guide surface 11, 21 serves to guide a filler material during the welding operation. The reservoir portion 62 adjacent to the first inclined surface 12, 22 is formed to obtain a . adequate ratio between the housing 10 and the annular ring 25 and the filler material in the weld bead after the welding operation.

[0051] Figures 5 and 7 illustrate a detailed view of region II as shown in Figure 1. As illustrated in Figure 5, the third contact surface 33 comprises at least a second bearing surface 43, a second inclined surface 42, a second guide surface 41, and a second recess 44. Similarly, the fourth contact surface 32 comprises at least a second bearing surface 53, a second inclined surface 52, a second guide surface 51, and a second recess 54.

[0052] Referring to [Fig. 7], at least one second bearing surface 43, 53, defined by an annular surface, extends radially in a direction normal to the X-axis. The second inclined surface 42, 52 extends from at least one second bearing surface 43, 53 and is inclined at a third angle θ with respect to at least one second bearing surface 43, 53. The second guide surface 41, 51 extends from the second inclined surface 42, 52 and is inclined at a fourth angle θ with respect to the second bearing surface 43, 53, the third angle θ being smaller than the fourth angle θ. The second inclined surface 42, 52 is disposed between the second guide surface 41, 51 and at least one second bearing surface 43, 53. The second recess 44, 54 is positioned adjacent to at least one second bearing surface 43,53.The second recess 44, 54 comprises a bottom surface and side walls on either side of the bottom surface defining a depth of the second recess 44, 54.

[0053] As illustrated in [Fig. 5], the third contact surface 33 is at least partially in axial contact with the fourth contact surface 34. In particular, the second bearing surface 43 of the housing 10 is in axial contact with the second bearing surface 53 of the annular ring 25. In one embodiment, the fourth contact surface 34 of the annular ring 25 further comprises a fourth bearing surface 533, the second recess 54 being positioned between the second bearing surface 53 and the fourth bearing surface 533.

[0054] Furthermore, according to [Fig. 5], an axial contact between the second bearing surface 43 in the third contact surface 33 of the flange 16 and the second bearing surface 53 in the fourth contact surface 34 of the annular ring 25 together forms the gap 60 configured by means of the second inclined surface 42, 53 and the second guide surface 41, 51 for the welding operation. The weld is made in the form of a weld bead in said gap 60 to join the flange 16 of the housing 10 and the annular ring 25. Said gap 60 comprises the guide portion 61 and the reservoir portion 62. The guide portion 61 is formed between the second guide surface 41 in the third contact surface 33 of the flange 16 and the second guiding surface 51 in the fourth contact surface 34 of the annular ring 25. The reservoir portion 62 of the gap 60 is formed between the second inclined surface 42 in the third contact surface 33 of the flange 16 and the second inclined surface 52 in the fourth contact surface 34 of the annular ring 25. The guiding portion 61 adjacent to the second guiding surface 41, 51 serves to guide the filler material during the welding operation. The reservoir portion 62 adjacent to the second inclined surface 42, 52 is formed to obtain the proper ratio between the housing 10 and the annular ring 25 and the filler material in the weld bead after the welding operation.

[0055] In an example not shown, the body 15 of revolution including the flange 16 is formed as a differential housing and the annular ring 25 is formed as a toothed ring including a plurality of gear teeth.

[0056] In one example, the present provision specifically considers a differential device for a vehicle transmission system in an automobile, comprising the assembly 100 configured according to the present invention, including the body 15 of revolution with the flange 16, formed as a differential housing, and the annular ring 25 formed as a toothed ring comprising a plurality of gear teeth. In a non-limiting example, the housing 10 is made of cast iron and the annular ring 25 is made of steel.

[0057] Figure 8 illustrates steps in the assembly of a vehicle transmission system configured according to the present invention. In step 71, the annular ring 25 and the housing 10 with a body of revolution 15 are assembled. Thus, the housing 10 comprises a first contact surface 31 and a third contact surface 33, and the annular ring 25 comprises a second contact surface 32 and a fourth contact surface as described above. The first contact surface 31 is at least partially in radial contact with the second contact surface 32 as described above. The third contact surface 33 is at least partially in axial contact with the fourth contact surface 34.

[0058] In step 72, the assembly of said annular ring 25 to the housing 10 is carried out.

[0059] In step 73, the assembly of the first contact surface 31 with the second contact surface 32 is made, the first bearing surface 13 of the housing 10 being in radial contact with the first bearing surface 23 of the annular ring 25, in which a gap 60 is configured by means of the first inclined surface 12, 22 and the first guide surface 11,21 to carry out a welding operation, in particular a LASER welding operation.

[0060] In an aspect such as in step 74, the assembly of the third contact surface 33 with the fourth contact surface 34 is carried out, the second bearing surface 43 of the housing 10 being in axial contact with the second bearing surface 53 of the ring annular 25, in which the gap 60 is configured by means of the second inclined surface 42, 53 and the second guide surface 41, 51 to perform the welding operation.

[0061] In step 75, the welding operation is carried out in said gap configured as a radial contact between the housing 10 and the annular body 25 by means of the first contact surface 31 and the second contact surface 32.

[0062] In step 76, the welding operation is carried out in said gap configured as an axial contact between the housing 10 and the annular body 25 by means of the third contact surface 33 and the fourth contact surface 34.

[0063] In one aspect, the welding operation is carried out both in said gap configured as a radial contact and in said gap configured as an axial contact.

[0064] In another aspect, the welding operation is carried out in said gap configured as a radial contact or in said gap configured as an axial contact.

[0065] Various modifications to the described embodiments, as well as to alternative embodiments of the invention, will be apparent to a person skilled in the art who has referred to the description of the invention. It is therefore envisaged that such modifications can be made without departing from the scope of the present invention as defined.

Claims

1. Demands Assembly (100) for vehicle transmission system comprising: a case (10) having a body (15) of revolution having an X axis; an annular ring (25) having the X axis as its axis, said annular ring (25) being assembled to the housing (10); in which the housing (10) includes a first contact surface (31) and the annular ring (25) includes a second contact surface (32), the first contact surface (31) being at least partially in radial contact with the second contact surface (32), the first contact surface (31) and the second contact surface (32) comprising: at least one first support surface (13, 23) defined by a cylindrical surface extending axially along the X axis; a first inclined surface (12, 22) extending from at least a first support surface (13, 23) and being sloped at a first angle (a) with respect to at least a first support surface (13, 23), a first guiding surface (11, 21) extending from the first inclined surface (12, 22) and sloping at a second angle (|3) with respect to at least one first support surface (13, 23), the first angle (a) being smaller than the second angle (|3), and the first inclined surface (12, 22) being disposed between the first guiding surface (11, 21) and at least one first support surface (13, 23); and a first recess (14, 24) positioned adjacent to at least one first support surface (13, 23). and / or the housing (10) comprising a third contact surface (33) and the annular ring (25) comprising a fourth contact surface (34), the third contact surface (33) being at least partially in axial contact with the fourth contact surface (34), the third contact surface (33) and the fourth contact surface (34) comprising:

2. at least one second support surface (43, 53) defined by an annular surface extending radially in a direction normal to the X axis; a second inclined surface (42, 52) extending from at least a second support surface (43, 53) and being inclined at a third angle (p) with respect to at least a second support surface (43, 53); a second guiding surface (41, 51) extending from the second inclined surface (42, 52) and sloping at a fourth angle (0) with respect to the second support surface (43, 53), the third angle (p) being smaller than the fourth angle (0), and the second inclined surface (42, 52) being disposed between the second guiding surface (41, 51) and at least one second support surface (43, 53); and a second recess (44, 54) positioned adjacent to at least a second bearing surface (43, 53). Assembly (100) for vehicle transmission system according to claim 1, wherein the housing (10) comprises a first contact surface (31) and the annular ring (25) comprises a second contact surface (32), the first contact surface (31) being at least partially in radial contact with the second contact surface (32), the first contact surface (31) and the second contact surface (32) comprise: at least a first bearing surface (13, 23) defined by a cylindrical surface extending axially along the X axis;a first inclined surface (12, 22) extending from at least a first support surface (13, 23) and being sloped at a first angle (a) with respect to at least a first support surface (13, 23), a first guide surface (11, 21) extending from the first inclined surface (12, 22) and being sloped at a second angle (|3) with respect to at least a first support surface (13, 23), the first angle (a) being smaller than the second angle (|3), and the first inclined surface (12, 22) being disposed between the first guide surface (11, 21) and at least a first support surface (13, 23); and a first recess (14, 24) positioned adjacent to at least one first bearing surface (13, 23), and in which the first contact surface (31) and the second contact surface (32) include the first bearing surface (13,; 23) and a third support surface (133, 233), the first recess (14, 24) being positioned between the first support surface (13, 23) and the third support surface (133, 233).

3. Assembly (100) for a vehicle transmission system according to any one of claims 1 to 2, wherein the housing (10) comprises a third contact surface (33) and the annular ring (25) comprises a fourth contact surface (34), the third contact surface (33) being at least partially in axial contact with the fourth contact surface (34), the third contact surface (33) and the fourth contact surface (34) comprising: at least one second bearing surface (43, 53) defined by an annular surface extending radially in a direction normal to the X axis; a second inclined surface (42, 52) extending from the at least one second bearing surface (43, 53) and being inclined at a third angle (q) with respect to the at least one second bearing surface (43, 53);a second guide surface (41, 51) extending from the second inclined surface (42, 52) and being inclined at a fourth angle (0) with respect to the second bearing surface (43, 53), the third angle (q) being smaller than the fourth angle (0), and the second inclined surface (42, 52) being disposed between the second guide surface (41, 51) and at least one second bearing surface (43, 53); and a second recess (44, 54) positioned adjacent to at least one second bearing surface (43, 53), and in which the body (15) of revolution comprises a flange (16) extending in a direction normal to the axis X and away from it, said flange (16) defining the third contact surface (33).

4. Assembly (100) for vehicle transmission system according to claim 3, wherein the third contact surface (33) comprises the second bearing surface (43, 53) and the fourth contact surface (34) comprises a fourth bearing surface (533), the second recess (54) being positioned between the second bearing surface (53) and the fourth bearing surface (533).

5. Assembly (100) for vehicle transmission system according to any one of claims 1 to 4, wherein the annular ring (25) is a toothed ring comprising a plurality of gear teeth.

6. Assembly (100) for vehicle transmission system according to claim 3, wherein the body (15) of revolution which includes the flange (16) is a differential housing.

7. Assembly (100) for vehicle transmission system according to any one of claims 1 to 6, wherein the first contact surface (31) of the housing (10) is assembled to the second contact surface (32) of the annular ring (25) by a weld, in particular a LASER weld.

8. Assembly (100) for vehicle transmission system according to any one of claims 1 to 6, wherein the third contact surface (33) of the housing (10) is assembled to the fourth contact surface (34) of the annular ring (25) by a weld, in particular a LASER weld.

9. Differential device for vehicle transmission system comprising the assembly (100) configured according to any one of claims 1 to 8.

10. Method of making an assembly (100) of a housing (10) and an annular ring (25) for a vehicle transmission system, comprising the following steps: providing the annular ring (25) and the housing (10) having a body (15) of revolution; assembling said annular ring (25) to the housing (10); and welding, in particular LASER welding, between a first contact surface (31) of the housing (10) and a second contact surface (32) of the annular ring (25), the first contact surface (31) being at least partially in radial contact with the second contact surface (32), the first contact surface (31) and the second contact surface (32) comprising: at least a first bearing surface (13, 23) defined by a cylindrical surface extending axially along the X axis;a first inclined surface (12, 22) extending from at least a first support surface (13, 23) and being inclined at a first angle (a) with respect to at least a first support surface (13, 23), a first guiding surface (11, 21) extending from the first inclined surface (12, 22) and being inclined at a second angle (|3) with respect to at least a first support surface (13, 23), the first angle (a) being smaller than the second angle (|3), and; the first inclined surface (12, 22) being disposed between the first guiding surface (11, 21) and at least one first support surface (13, 23); and a first recess (14, 24) positioned adjacent to at least one first support surface (13, 23) and / or welding, in particular laser welding, between a third contact surface (33) of the housing (10) and a fourth contact surface (34) of the annular ring (25), the third contact surface (33) being at least partially in axial contact with the fourth contact surface (34), the third contact surface (33) and the fourth contact surface (34) comprising: at least a second support surface (43, 53) defined by an annular surface extending radially in a direction normal to the X axis; a second inclined surface (42, 52) extending from at least a second support surface (43, 53) and being inclined at a third angle (q) with respect to at least a second support surface (43, 53); a second guiding surface (41, 51) extending from the second inclined surface (42, 52) and sloping at a fourth angle (0) with respect to the second support surface (43, 53), the third angle (q) being smaller than the fourth angle (0), and the second inclined surface (42, 52) being disposed between the second guiding surface (41, 51) and at least one second support surface (43, 53); and a second recess (44, 54) positioned adjacent to at least a second bearing surface (43, 53).

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