阅读说明：本技术 动力传递装置 (Power transmission device ) 是由 吉尔·加斯顿·雅克·古安 于 2019-09-02 设计创作，主要内容包括：本发明涉及一种具有纵向轴线X的环形的动力传递元件22,包括相互结合的第一环形部件26a、包括扭矩传递设备46a的第二环形部件26b及第三环形部件26c,所述第一环形部件26a和所述第三环形部件26c由第一金属材料制成,所述第二环形部件26b由密度大于所述第一金属材料的第二金属材料制成,所述第二环形部件26b被纵向地锁定在所述第一环形部件26a与所述第三环形部件26c之间,并径向地锁定在所述第一环形部件26a上,所述第一环形部件26a与所述第三环形部件26c接触并焊接到其上。(The present invention relates to an annular power transmitting element 22 having a longitudinal axis X, comprising a first annular part 26a, a second annular part 26b comprising a torque transmitting device 46a and a third annular part 26c joined to each other, said first annular part 26a and said third annular part 26c being made of a first metallic material, said second annular part 26b being made of a second metallic material having a density greater than said first metallic material, said second annular part 26b being longitudinally locked between said first annular part 26a and said third annular part 26c and radially locked on said first annular part 26a, said first annular part 26a being in contact with and welded to said third annular part 26 c.)

1. An annular power transmitting element (22, 24) having a longitudinal axis, comprising a first annular part (26a, 28a), a second annular part (26b, 28b) comprising a torque transmitting device (46a, 46b) and a third annular part (26c, 28c) in combination with each other, wherein the first annular part (26a, 28a) and the third annular part (26c, 28c) are composed of a first type of metallic material, the second annular part (26b, 28b) is composed of a second type of metallic material having a density greater than the first type of metallic material, the second annular part (26b, 28b) is longitudinally locked between the first annular part (26a, 28a) and the third annular part (26c, 28c) and radially locked between the first annular part (26a, 28a) and the third annular part (26c, 28c), 28c) At least one of.

2. Element according to claim 1, wherein said first annular component (26a, 28a) is in contact with said third annular component (26c, 28c) and is directly connected thereto, preferably welded thereto.

3. The element of claim 1 or 2, wherein the welding of the first component (26a, 28a) to the third component (26c, 28c) is friction stir welding.

4. The element of any one of claims 1 to 3, wherein the second component (26b, 28b) cooperates with at least one of the first component (26a, 28a) and the third component (26c, 28c) by a positive fit for rotationally locking the second component (26b, 28b) with the first and second components (26a, 26b, 28a, 28 b).

5. An element as claimed in claim 4, wherein said third part (26c, 28c) comprises an annular portion (64, 100, 102) in radial annular contact with said first annular part (26a, 28a) and carrying fingers (60, 94) engaging with a housing (56, 90) of said second annular part (26b, 28 b).

6. The element of any one of claims 1 to 5, wherein the first annular component (26a, 28a) comprises an annular shoulder on which the second annular component (26b, 28b) is longitudinally applied, the third annular component (28a, 28b) being longitudinally arranged opposite the shoulder with respect to the second annular component (26b, 28 b).

7. The element of claims 5 and 6, wherein the fingers (60) pass through the second annular part (26b), the ends (72) of the fingers (60) being welded to the annular shoulder.

8. An element according to any one of the preceding claims, wherein the torque transmitting device (46a) is oriented radially outwards, the third annular component (26c) surrounding the cylindrical surface (36) of the first annular component (26a) and being welded thereto.

9. The element of claim 8, wherein said third annular component (26c) comprises an annular rim (64) welded to the annular rim (36) of said first annular component (26 a).

10. An element according to any one of the preceding claims, wherein the torque transmitting device (46b) is oriented radially inwards, the third annular component (28c) being mounted in a cylindrical surface (72, 72b) of the first component (28) and welded thereto.

11. Element according to any one of the preceding claims, characterized in that the metallic material of the first type is an aluminium alloy.

12. Element according to any one of the preceding claims, characterized in that said second type of metallic material is steel.

Technical Field

The present invention relates to a power transmitting element, and more particularly, to a power transmitting element made of two materials.

Background

Fig. 1 shows an annular power transmitting element 10 of a known type made of a single material, for example steel. It includes a tubular barrel 12 having an internal groove 14 for connecting a power transmitting element to a shaft having a mating groove. An annular web 16 connects the cartridge radially to a radially outer annular member having annular teeth 18. Of course, the teeth 18 and splines 14 may be split into two separate power transmitting elements 10.

In operation, the splines 14 and teeth 18 provide a power transmission that requires these components to be made of a material with high mechanical strength, which explains why the steel power transmitting element 10 is typically manufactured. However, such a power transmission element 10 is relatively heavy.

Therefore, it is proposed to construct the power transmission element 10 from two materials. The power transmission element 10 shown in fig. 2 is a gear wheel, which here comprises an annular web 16 made of aluminium and teeth 18 made of steel. The annular web 16 and the teeth 18 are rigidly attached to each other by a threaded connection 20.

The proposed design is problematic if the implementation principle of the power transmission element in two materials is interesting, since this requires the integration of a threaded assembly. This technique is undesirable because it requires machining to center the barrel 12 with the web 16 to achieve its assembly and ensure its concentricity. These centering operations are intended to produce a radially outer annular surface of the barrel 12 and a radially inner annular surface on the web 16, the radially outer annular surface of the barrel 12 and the radially inner surface of the web 16 being intended to cooperate together to form a centering of the web 16 on the barrel 12.

The machining operation also includes drilling holes circumferentially distributed through the web 16 and the teeth 18. These holes traverse set screw 20. Such an assembly with a plurality of substantially fixed points has reliability problems that can lead to the detachment of the web 16 and the teeth 18.

Moreover, assembly and maintenance of the power transfer element requires traceability of its component parts, namely the barrel 12, the web 16, the teeth 18 and the set screws 20. This traceability requires a large and expensive logistics.

The present invention seeks to propose a solution for constructing an endless power transmission element to overcome all or part of the above disadvantages.

Disclosure of Invention

This document relates to a power transmitting annular element having a longitudinal axis comprising a first annular component integrated with each other, a second annular component comprising a torque transmitting device and a third annular component, wherein the first annular component and the third annular component are composed of a first metallic material, the second annular component is made of a second metallic material having a density greater than the density of the first metallic material, the second annular component is longitudinally locked between the first annular component and the third annular component and radially locked on at least one of the first annular component and the third annular component.

The first annular member may be in contact with the third annular member. The first annular member may be directly attached to the third annular member. The first annular component may be welded to the third annular component.

The power transmission unit is composed of three components that are structurally different from each other. The second annular part, which contains only the torque transmitting device, needs to be made of a material of higher density, and the first and third parts are made of a material of lower density, which may reduce the mass of the power transmitting element. The first and third annular members are therefore devoid of torque transmitting devices.

Furthermore, locking of the second annular part with the first annular part and the third annular part is formed by axial abutment of the second annular part on the first and third annular parts. These axial abutments prevent axial displacement of the second component, thereby forming a rigid assembly.

The welding of the first member to the third member may be friction stir welding. This type of welding allows a rigid connection between the two metal parts without the need for any filler material.

This welding technique makes it possible to weld together metallic materials that are considered to be unweldable using conventional welding techniques, which is the case for new aluminum alloys. More specifically, friction stir welding is a solid phase weld that is performed at a temperature below the melting temperature of the material and, thus, avoids the formation of the defects associated with conventional welds. For example, a defect associated with poor solidification of the molten bath may be the formation of pores or cracks.

Friction stir welding is considered to be the only process capable of welding the latest generation of aerospace aluminum alloys.

Finally, friction stir welding produces welded joints with high mechanical properties, which are generally superior to those obtained by conventional fusion welding techniques.

The second annular member is cooperable for rotationally locking the second member with the first and second annular members by a positive fit to at least one of the first member and the third member.

The presence of a positive fit between said second annular member and said first and/or third annular member may thus prevent any rotation of said second annular member and lock it to said first and third annular members.

The third member may comprise a ring member in radial annular contact with the first ring member and carrying fingers which engage with the housing of the second ring member.

The positive fit mating may include engaging fingers of the third annular member in openings of a housing forming the second annular member.

The first annular member may include an annular shoulder on which the second annular member is longitudinally applied, the third annular member being longitudinally arranged opposite the shoulder relative to the second annular member.

In a particular embodiment, the fingers may pass through the second annular member, the finger tips being welded to the annular shoulder.

The weld between the weld where the finger tips contact the shoulder of the first annular member and the wall at the radial contact between the first and third annular members strengthens the connection between the first and third annular members holding the second annular member in place.

The finger welding is preferably friction stir welding, more particularly clear welding, which comprises inserting a rotating mandrel through said first member until it contacts said finger tips, thereby welding the first ring member with said at least finger tips of said third ring member.

The torque transmitting device may be oriented radially outwardly, with the third annular member surrounding the cylindrical surface of the first annular member and welded thereto.

The torque transmitting device may thus be a tooth extending radially from the end of the power transmitting element.

The third annular component may comprise an annular rim welded to the annular rim of the first annular component.

The arrangement and welding between the first and third annular parts is carried out in such a way that the annular edge of the first annular part and the annular edge of the third annular part form a surface continuity without any step. Preferably, the weld may be of the edge-to-edge type.

The torque transmitting device may be oriented radially inwardly, the third annular component being mounted inside the cylindrical surface of the first component and welded thereto.

The torque transmitting devices may thus be splines extending radially inwardly from the radially inner surface of the barrel.

In a practical embodiment, the first metallic material may be an aluminum alloy. The second metallic material may be steel. The indication that the first and third annular components are made of the first metallic material does not mean that the material is identical for the first and third annular components.

The invention will be better understood and other details, features and advantages thereof will be apparent from the following description, given by way of non-limiting example, with reference to the accompanying drawings.

Drawings

Figure 1, already described above, is a perspective view of a first power transmission element of the prior art,

fig. 2, already described above, is a front view of a second power-transmitting element of the prior art;

figure 3A is a cross-sectional half view of the power transmission element according to the invention, according to the first embodiment, along a cutting plane comprising the axis of the transmission element and not passing through the fingers of the third annular component;

figure 3B is a half view of the power transmission element shown in figure 3A along a cutting plane including the axis of the power transmission element and through one of the fingers of the third part;

fig. 4A is a front view of a third component of the power transmitting element according to the first embodiment of the invention;

figure 4B is a side view of the third part of figure 4A;

figure 5 is a cross-sectional view of a power transmitting element according to a second embodiment of the invention,

fig. 6 is a perspective view of a third part of the power transmitting element according to the second embodiment of the invention;

fig. 7 is a section illustrating a welding path according to a second embodiment of the invention.

Detailed Description

The endless power transmitting elements 22, 24 of the two embodiments of the present invention will now be described, with a first embodiment of the power transmitting element 22 shown in fig. 3A, 3B, 4A and 4B, and a second embodiment of the power transmitting element 24 illustrated in fig. 5, 6 and 7.

In various embodiments, the endless power transmitting elements 22, 24 comprise three annular components, a first annular component 26a, 28a, a second annular component 26b, 28b and a third annular component 26c, 28c, coaxial along the longitudinal axis X. In each embodiment, the first and third annular members 26a, 28c are made of a metallic material having a lower density than the second annular members 26b, 28 b. In particular, the first 26A, 28a and third 26c, 28c annular members are made of an aluminum alloy, and the second 26b, 28b annular members are made of steel.

In the first embodiment, the first annular component 26a comprises the tubular barrel 12, the annular web 16, said annular web 16 comprising a first substantially radially inner annular wall 30 radially connected at its ends to an annular recess 32 in the axial direction. The second outer annular wall 34 extends radially outwardly from a radially outer annular surface 36 of the annular remainder 32. The radially outer annular surface 36 of the receptacle 32 is generally cylindrical. The second radial annular wall 34 comprises a radial annular face 38 forming an annular shoulder, the advantages of which will appear from the description below. It can be seen that the second outer radial annular wall 34 comprises a radially outer annular surface 40, which radially outer annular surface 40 is substantially cylindrical and cooperates with the second annular part 26b, as will appear more clearly later. Thus, it will be appreciated that the web 16 of the first annular component 26a includes a first radial annular wall 30, an annular containment portion 32 and a second radial annular wall 34.

The second annular part 26b has a T-shaped cross-section along a cutting plane including said longitudinal axis. The second annular member includes a radial annular wall 42 connected at its radially outer end to a cylindrical wall 44 carrying a first torque transmitting device 46 a. The first torque transmitting device 46a may be an annular tooth 18 designed to engage a tooth of another component. The cylindrical wall 44 includes a radially inner cylindrical face 48, the radially inner cylindrical face 48 being applied to the cylindrical face 40 of the second radial annular wall 34 of the web 16 of the first annular component 26 a. The radial annular wall 42 of the second annular component 26b comprises a first radial annular face 50 and a second radial annular face 52, the first radial annular face 50 being applied to the radial annular face 38 forming an annular shoulder of the first component 26 a. The radial annular wall 42 of the second annular part 26b comprises, at its radially inner end, an inner cylindrical surface 54, which inner cylindrical surface 54 is applied to the cylindrical surface 36 of the remaining portion 32 of the first annular part 26 a. In addition, the radial annular wall 42 includes a plurality of longitudinally traversing shells 56.

In the particular case shown in fig. 3A to 4B, the housing 56 is a recess and opens radially inward. They are preferably evenly distributed circumferentially about the longitudinal axis X.

The radial abutment between the first annular part 26a and the second annular part 26b constitutes a means for centring the second annular part 26b with respect to the first annular part 26 a.

The third annular member 26c comprises a ring 58 carrying a plurality of fingers 60, said fingers 60 being circumferentially distributed about the longitudinal axis X and projecting on a first radial annular face 62 of the ring 58. Once the fingers 60 of the third annular member 26c have been inserted into the annular housing 58, the annular housing abuts the radial annular wall 38 that forms a shoulder of the first annular member 26 a. When the fingers 60 are inserted into the housing 58, the first radial annular face 62 carrying the fingers 60 will be applied to the second radial annular face 52 of the radial annular wall 42 of the second annular member 26 b. The ring 58 of the third annular component 26c also includes a radially inner cylindrical surface 64 and a radially outer cylindrical surface 66. Once fingers 60 have been inserted into housing 58, inner cylindrical surface 64 of third annular member 26c is radially applied to cylindrical surface 36 of containment portion 32 of first annular member 26a, and outer cylindrical surface 66 is radially applied to inner cylindrical surface 48 of cylindrical wall 44 of second annular member 26 b.

The third annular member 26c includes a second radial annular surface 68 axially opposite the first radial annular surface 62 carrying the fingers 60. The second radial annular face 68 of the third annular component 26c is flush with the axial end 70 of the receptacle 32 of the first component 26 a. Preferably, the end 70 of the containment portion 32 is axially opposite the second radial wall 34 of the first annular component 26 a. The second radial annular face 68 of the third annular component 26c and the axial end 70 of the receptacle 32 form surface continuity without any step.

The first and third annular members 26a, 26c are welded together edge-to-edge at the radial abutment between the inner cylindrical surface 64 of the third member 26c and the cylindrical surface of the receptacle 32 of the first annular member 26 a.

The edge-to-edge welding is friction stir welding. This welding means that there are no welds in the flush planes of the first and third annular components 26a, 26 c. The edge-to-edge welding of the first and third annular parts 26a, 26c thus prevents any axial displacement of the second annular part 26b axially adjacent thereto.

The fingers 60 of the third annular member 26c, which are axially adjacent to the radial annular surface 38 forming the shoulder of the first annular member 26a, each have a radial surface 72, said radial surfaces 72 being welded to the radial annular surface 38 forming the shoulder of the first annular member 26 a.

The weld is preferably a friction stir weld which consists of inserting a mandrel through the first annular member 26a until it contacts the ends 72 of the fingers 60, thereby welding them together.

Once the first and third annular parts 26a, 26c have been welded, the fingers 60 of the third part 26c inserted into the housing 58 of the second part 26b make it possible to prevent any rotation of the second part 26b along the longitudinal axis X with respect to the first and third parts 26a, 26 c.

In the particular case shown in fig. 3A to 4B, the second annular member 26B has three housings 58 and the third annular member 26c has three fingers 60, each of said fingers 60 cooperating with one of the housings 58.

In the second embodiment, the power transmitting element 24 includes a cylinder 12 formed of a first annular member 28a, a second annular member 28b, and a third annular member 28 c.

The first annular component 28a includes a tubular wall 74. The tubular wall has an inner cylindrical surface 76. The inner cylindrical surface 76 includes a first inner cylindrical surface 76a and a second inner cylindrical surface 76 b. The first and second inner cylindrical faces 76a, 76b are connected to each other by a radial annular wall 78 forming a shoulder with the second inner cylindrical wall 76b, the advantages of which will appear from the description below.

The second annular member 28b includes a tubular wall 80 having the second torque transmitting device 46b on an inner cylindrical surface thereof. The second torque transmitting device 46b may be a spline 14 designed to mate with a corresponding spline of a shaft. The tubular wall 80 comprises a radially outer cylindrical surface 84, which radially outer cylindrical surface 84 is applied to the second cylindrical surface 76b of the first annular portion 28 a. The second annular part 28b also comprises a first radial annular face 86 applied to the radial annular wall 78 forming a shoulder of the first part 28 a. The second annular member 28b includes a second radial annular face 88 axially opposite the first radial annular face 86. The second radial annular face 88 has a plurality of axially extending blind shells 90. The blind housing 90 opens radially to the outside.

The third annular member 28c comprises a ring 92 carrying a plurality of fingers 94, said fingers 94 being circumferentially distributed about the longitudinal axis X and projecting on a radial annular face 96 of the ring 92. Ring 92 further includes a radially inner cylindrical surface 98 and a radially outer cylindrical surface 100. The fingers 94 each have an outer cylindrical surface 102, said outer cylindrical surface 102 extending axially in extension of an outer cylindrical surface 100 of the ring 92 of the third annular component 28 c.

Once the fingers 94 of the third annular portion 28c have been inserted into the blind housing 90 of the second annular portion 28b, the radial annular face 96 carrying the fingers 94 axially abuts on the second radial annular face 88 of the second annular portion 28b provided with the blind housing 90. An outer cylindrical surface 102 of the finger 94 and an outer cylindrical surface 100 of the ring 92 of the third annular wall 28c annularly radially abut the second inner cylindrical surface 76b of the first annular portion 28 a.

The fingers 94 of the third annular portion 28c and the outer cylindrical surfaces 100, 102 of the ring 92 are welded to the second inner cylindrical surface 76b of the first annular portion 28 a. Such welding is preferably transparent friction stir welding.

The mandrel thus preferably accommodates the periphery 104 of the radial abutment region between the first and third annular components 28a, 28c, as shown in fig. 7.

The welding of the first and third annular parts 28a, 28c thus prevents axial displacement of the second annular part 28b axially adjacent thereto.

The presence of the fingers 94 of the third member 28c inserted in the housing 90 of the second member 28b prevents any rotation of the second member 28b relative to the first and third annular members 28a, 28c along the longitudinal axis X.

In one embodiment, not shown in the figures, the power transmitting elements 22, 24 may include a first torque transmitting device 46a according to a first embodiment and a second torque transmitting device 46b according to a second embodiment.