阅读说明：本技术 扭转阻尼器和机动车辆 (Torsional damper and motor vehicle ) 是由 P.布切尼 P.梅劳 于 2018-04-18 设计创作，主要内容包括：本发明涉及一种扭转阻尼器(1),包括：-主元件(3),包括径向壁(3c)；-次元件(7),主元件(3)和次元件(7)相对于彼此绕旋转轴线(X)自由旋转,-弹性阻尼器件,被构造为阻尼非周期性旋转,-连接板(9),旋转地联接至次元件(7)且旨在与弹性阻尼器件接触,连接板(9)和次元件(7)之间的旋转联接通过铆钉(12)实现,该主元件(3)在其径向壁(3b)中包括至少一个开口(30),以允许连接板(9)铆接到次元件(7),扭转阻尼器(1)还包括至少一个阻挡元件(32、32’),其包括包覆模制的弹性体元件(32b、32’)且被构造为阻挡所述至少一个开口(30),所述阻挡元件包括被构造为允许铆接工具(35)通过的可变形开口(33、34)。(The invention relates to a torsional damper (1) comprising: -a main element (3) comprising a radial wall (3 c); -a secondary element (7), the primary element (3) and the secondary element (7) being free to rotate relative to each other about an axis of rotation (X), -elastic damping means configured to damp non-periodic rotations, -a connection plate (9) rotationally coupled to the secondary element (7) and intended to be in contact with the elastic damping means, the rotational coupling between the connection plate (9) and the secondary element (7) being achieved by means of a rivet (12), the primary element (3) comprising in its radial wall (3b) at least one opening (30) to allow riveting of the connection plate (9) to the secondary element (7), the torsional damper (1) further comprising at least one blocking element (32, 32 ') comprising an overmoulded elastomeric element (32b, 32') and configured to block said at least one opening (30), said blocking element comprising a deformable opening (33, b) configured to allow passage of a riveting tool (35), 34).)

1. A torsional damper (1) comprising:

a main element (3) comprising a radial wall (3b),

-a secondary element (7), the primary element (3) and the secondary element (7) being rotatable relative to each other about a rotation axis (X),

-elastic damping means configured to damp non-periodic rotations,

-a connection plate (9) rotationally coupled to the secondary element (7) and intended to be in contact with the elastic damping means, the rotational coupling between the connection plate (9) and the secondary element (7) being achieved by means of a rivet (12), the primary element (3) comprising at least one opening (30) in its radial wall (3b) to allow the connection plate (9) to be riveted to the secondary element (7),

Characterized in that the torsional damper (1) further comprises at least one blocking element (32, 32 '), said at least one blocking element (32, 32 ') comprising an overmoulded elastomeric element (32b, 32 ') and being configured to block said at least one opening (30), said blocking element comprising a deformable opening (33, 34) configured to allow the passage of a riveting tool (35).

2. the torsional damper (1) as claimed in claim 1, wherein the torsional damper (1) is a flexible dual mass flywheel.

3. A torsional damper (1) as claimed in claim 2, wherein the radial wall (3b) of the main element (3) has a thickness of less than or equal to 4mm, preferably the radial wall (3b) of the main element (3) has a thickness of 0.7 to 2mm, including both ends.

4. A torsional damper (1) as claimed in any of the preceding claims, wherein said blocking element (32') is overmoulded onto a radial wall (3b) of the main element (3).

5. A torsional damper (1) according to any of the claims 1 to 3, wherein the blocking element (32) comprises a metal core (32a), onto which metal core (32a) an elastomeric element (32b) is overmoulded, the blocking element (32) being pressed onto the radial wall (3b) of the main element (3) at the location of its metal core (32 a).

6. A torsional damper (1) as claimed in claim 5, wherein said blocking element (32) is fixed to a non-planar radial wall (3 b).

7. A torsional damper (1) as claimed in any of the preceding claims, wherein the elastomeric element (32b, 32 'b) of the blocking element (32, 32') comprises a central portion in the general shape of a cone or a substantially cone, the axis of which is parallel to the rotation axis (X).

8. The torsional damper (1) of claim 7, wherein the deformable opening (33) is in the central portion and has a generally circular shape with a diameter of less than or equal to 2 mm.

9. The torsional damper (1) as claimed in any of claims 1 to 6, wherein the elastomeric element (32b, 32 ' b) of the blocking element (32, 32 ') comprises a substantially planar central portion and the deformable opening (34) has the form of a groove (34) in the central portion of the blocking element (32, 32 ').

10. a torsional damper (1) as claimed in claim 9, wherein said groove (34) extends along a diameter of a central portion of the elastomeric element (32b, 32' b).

11. a torsional damper (1) according to claim 9 or 10, wherein the grooves (34) are oriented in a radial direction with respect to the axis of rotation (X).

12. the torsional damper (9) of any of claims 1 to 11, wherein the blocking element (32, 32') comprises a first lip and a second lip (36) on opposite sides of the groove (34), the first lip (36) being configured to at least partially overlap the second lip (36).

13. A torsional damper (1) as claimed in any of the preceding claims, wherein a central portion of the blocking element (32, 32' b) comprises a hydrophobic material.

14. A motor vehicle comprising an anti-twist damper (1) as claimed in any one of the preceding claims.

Technical Field

The present invention relates to a torsional damper, in particular for a motor vehicle.

Background

Internal combustion engines are unable to produce constant torque and are subject to non-periodic operation due to continuous explosions in their cylinders. This non-periodic operation generates vibrations which are easily transmitted to the gearbox and thus produce particularly undesirable effects and noise. It is known to equip motor vehicles with torsional dampers in order to reduce the undesired effects of vibrations and to improve the driving comfort of the motor vehicle.

The torsional damper generally includes a primary element and a secondary element that are rotatable relative to each other about an axis of rotation. The torsional damper further comprises an elastic damping means arranged between the primary and secondary elements to damp non-periodic operation. Furthermore, some torsional dampers, particularly dual mass flywheel dampers, utilize a connecting plate that is rotationally coupled to the secondary element to interact with the elastic damping means.

the coupling between the secondary element and the connecting plate is usually produced by rivets, which are usually the final operation when assembling the torsional damper, to allow the positioning of the connecting plate.

But this means that there is at least one opening in the main element for exerting pressure on the rivet on the side of the main element. Now, this type of opening may lead to sealing problems and the introduction of fluids through the opening. The introduction of fluid between the primary and secondary elements can lead to degradation of the torsional damper, for example due to the action of the fluid flow through corrosion of the elastic damping means or through grease removal in the elastic damping means. Furthermore, grease carried by the fluid can create contamination of the outside of the torsional damper.

To overcome these sealing problems, it is known to use plugs to block the openings, as described for example in the applicant's application FR2736116B 1. However, the fixing of these plugs is only satisfactory in torsional dampers where the main element is rigid, that is to say where the radial wall of the main element in which the opening is made is thick. .

Disclosure of Invention

the present invention therefore aims to provide a solution that allows to achieve a satisfactory sealing, even for torsional dampers that are flexible with respect to the main element, that is to say in which the walls of the main element are relatively thin, typically less than 4mm thick.

to this end, the invention relates to a torsional damper comprising:

a main element comprising a radial wall,

a secondary element, the primary element and the secondary element being rotatable relative to each other about an axis of rotation,

-elastic damping means configured to damp non-periodic rotations,

a connecting plate rotationally coupled to the secondary element and intended to be in contact with the elastic damping means, the rotational coupling between the connecting plate and the secondary element being achieved by means of a rivet, the primary element comprising at least one opening in its radial wall to allow the riveting of the connecting plate to the secondary element,

Wherein the torsional damper further comprises at least one blocking element comprising an overmolded elastomeric element and configured to block the at least one opening, the blocking element comprising a deformable opening configured to allow passage of a riveting tool.

According to another aspect of the invention, a torsional damper comprises:

A main element comprising a radial wall,

a secondary element, the primary element and the secondary element being rotatable relative to each other about an axis of rotation,

-elastic damping means configured to damp non-periodic rotations,

A connecting plate rotationally coupled to the secondary element and intended to be in contact with the elastic damping means, the rotational coupling between the connecting plate and the secondary element being achieved by means of a rivet, the primary element comprising at least one opening in its radial wall to allow the riveting of the connecting plate to the secondary element,

Wherein the torsional damper further comprises at least one bi-material blocking element configured to block the at least one opening, the blocking element comprising a deformable opening configured to allow passage of a riveting tool.

According to another aspect of the invention, the torsional damper is a flexible dual mass flywheel.

according to another aspect of the invention, the radial wall of the main element has a thickness less than or equal to 4mm, preferably between 0.7 and 2mm, including both ends.

according to another aspect of the invention, the blocking element is overmoulded onto the radial wall of the main element.

According to another aspect of the invention, the blocking element comprises a metal core onto which the elastomeric element is overmoulded, said blocking element being pressed onto the radial wall of the main element at the location of its metal core.

according to another aspect of the invention, the blocking element is fixed to the non-planar radial wall.

According to another aspect of the invention, the elastomeric element of the blocking element comprises a central portion in the general shape of a cone or a substantially cone, the axis of which is parallel to the rotation axis.

according to another aspect of the invention, the deformable opening is in the central portion and has a generally circular shape with a diameter less than or equal to 2mm in an undeformed state.

According to another aspect of the invention, the elastomeric element of the blocking element comprises a substantially planar central portion and the deformable opening has the form of a groove in the central portion of the blocking element.

According to another aspect of the invention, the groove extends along a diameter of the central portion of the elastomeric element.

according to another aspect of the invention, the groove is oriented in a radial direction with respect to the axis of rotation.

according to another aspect of the invention, the blocking element comprises a first lip and a second lip on opposite sides of the groove, the first lip being configured to at least partially overlap the second lip.

According to another aspect of the invention, the central portion of the barrier element comprises a hydrophobic material.

The invention also relates to a motor vehicle comprising a torsional damper as described above.

drawings

Other characteristics and advantages of the invention will become clearer in the following description, given by way of non-exhaustive example, with reference to the accompanying drawings, in which:

Fig. 1 shows a schematic cross-sectional view, taken in a radial plane of a part of the torsional damper,

Fig. 2 shows a perspective cross-sectional view, taken along a radial plane of the torsional damper,

FIG. 3 shows a perspective view of the main element;

Figures 4a to 4c show perspective views of a blocking element according to a first variant in each case,

Figure 4d shows a cross-sectional view of a blocking element according to a first variant,

Fig. 4e and 4f show two cross-sectional views of a part of the blocking element, with overmoulds of the first and second type respectively,

Figure 5a shows a perspective view of a blocking element on a non-planar surface,

figure 5b shows a cross-sectional view of the blocking element on a non-planar surface,

Figures 6a and 6b show perspective views of a blocking element according to a second variant,

Figure 6c shows a cross-sectional view of a blocking element according to a second variant,

Figure 7a shows a perspective view of a blocking element according to a third variant,

figure 7b shows a cross-sectional view of a blocking element according to a third variant,

fig. 8a to 8c show perspective views of a blocking element according to a second embodiment.

Detailed Description

Throughout the drawings, elements that are the same or provide the same function have the same reference numeral.

The following examples are only examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference number refers to the same embodiment, or that a feature only applies to one embodiment. Individual features of different embodiments may also be combined or interchanged equally to provide other embodiments.

In the following description, the terms "first," "second" (e.g., "first portion," "second portion") are used merely to reference elements to indicate and distinguish similar, but not identical, elements. The index does not imply a priority of an element relative to another element and such terms are readily interchangeable without departing from the scope of the invention. The index also does not imply a temporal order.

In the rest of the description, the terms "axial", "radial" and "transverse" used to define the orientation of the elements of the torsional damper are relative to the axis of rotation X of the torsional damper and define, respectively, a direction parallel to the axis of rotation X, a plane containing the axis of rotation X and a plane perpendicular to the axis of rotation X.

Fig. 1 and 2 show a torsional damper 1 comprising a primary element 3 and a secondary element 7, which are rotatable relative to each other about a rotation axis X. The torsional damper 1 is, for example, a dual mass flywheel of the flexible type, that is to say, a torsional damper 1 in which the primary element 3 and the secondary element 7 are flywheels, the primary element 3 comprising a radial wall 3b whose thickness is less than or equal to 4mm, for example from 0.7 to 2mm inclusive.

The main element 3 has a central axis 3a extending in the axial direction and intended to receive a rolling bearing 5 (it is also possible to use a radial or axial smooth bearing instead of the rolling bearing 5), a radial wall 3b, which can be made of a set of metal plates, a peripheral wall 3c arranged outside the radial wall 3b (that is to say at a diameter at a greater distance from the axis of rotation X), and a closing cover 3e fixed to the peripheral wall 3 c. The radial wall 3b, the peripheral wall 3c and the closing lid 3e define a housing 3 d. The closing lid 3e is fixed by welding, embedding or screwing, for example. The secondary element 7 is mounted for rotation on the central axis 3a of the primary element 3 via a rolling bearing 5. The rolling bearing 5 is positioned, for example, in a central housing 7a of the secondary element 7. The rolling bearing 5 can be held in the housing 7a by means of a resilient ring 50 (also known as circlip). Alternatively, in the case of dampers for dual clutches or for some hybrid transmissions, the rolling bearing 5 or bearings may be omitted. In this case, the secondary part is centered by the double clutch or by the transmission input shaft.

The torsional damper 1 also comprises a connecting plate 9 intended to be coupled in rotation to the secondary element 7, for example by means of rivets 12. In the assembled state of the torsional damper 1, the one or more fins 90 of the connecting plate 9 extend, for example, into the peripheral housing 3d of the main element 3. The torsional damper 1 also comprises elastic damping means (not shown) intended to be arranged in the housing 3d and extending along an arc of a circle against, for example, the peripheral wall 3c of the main element 3. The elastic damping means may be a helical spring. The helical spring may comprise a plurality of portions configured to act in parallel, that is to say to be compressed in a similar manner between identical elements.

The or each fin 90 of the connecting plate 9 is therefore intended to be in contact with one end of the helical spring, the other end of which is intended to be in contact with the abutment 20 of the main element 3, as better visible in figure 3. The abutment 20 is formed, for example, by an internal recess in the peripheral wall 3c and/or the closing lid 3 e. The internal recess may be formed by stamping. Other forms of abutment on the main element 3 are envisaged. The elastic damping means is configured to damp non-periodic rotation between the primary element 3 and the secondary element 7.

The figures show a torsional damper 1 comprising a single spring stage and a single connecting plate 9, but the invention is not limited to this type of torsional damper 1 and is equally applicable to torsional dampers comprising a plurality of spring stages, that is to say a plurality of springs stacked in radial and/or axial direction, which springs are mounted in parallel or in series with each other. In these torsional dampers, which comprise spring stages, the connecting plate 9 extends into the peripheral housing 3d of the element without being rotationally coupled to the secondary element 7. The secondary element 7 is driven in rotation by the connecting plate 9 on and above a helical spring, for example via at least one supplementary spring stage, intended to be arranged in the housing 3d and extending along an arc of a circle against the peripheral wall 3c of the primary element 3.

The torsional damper 1 also comprises a sealing gasket 15, intended to be fixed to the secondary element 7, for example by means of rivets 12. The sealing gasket 15 comprises a distal part 15b made of plastic material and intended to come into contact with the main element 3, for example with the closing lid 3 e; also included is a proximal part 15a, for example made of metal, configured to hold the distal part 15b against the main element 3. The proximal part 15a of the sealing gasket 15 is fixed to the secondary element 7.

Furthermore, in order to be able to rivet the rivet 12 after assembly of the connecting plate 9, the secondary element 7 and, where appropriate, the sealing gasket 15, at least one hole or opening 30 is formed in the wall 3b of the main element, facing the rivet 12. In the present example, ten openings 30 are formed to face ten rivets 12.

Furthermore, in order to seal the torsional damper 1 and prevent the introduction of dirt or fluid into the housing 3 where the elastic damping means are located, an overmolded elastomeric blocking element 32 is arranged at the location of each opening 30 to block it.

According to a first embodiment, illustrated in fig. 1 to 5, the blocking element 32 comprises a peripheral metal core 32a intended to be crimped to the radial wall 3b at a peripheral position of the opening 30. Fig. 4a and 4b show the blocking element 32 before and after crimping to the radial wall 3b of the main element 3. Thus, the metal core 32a has, for example, a tubular shape, the axis of which is parallel to the rotation axis X and has a flange 320 formed at the first end of the pipe. The second end may have a slightly flared shape to assist crimping while allowing the tube to be introduced into the opening of the radial wall 3b of the main element 3 (fig. 4 a). The second end is then bent towards the outside of the pipe to allow crimping onto the periphery of the opening 30 (fig. 4 b). The metal core 32a is made of, for example, aluminum or steel.

The barrier element 32 also includes an elastomeric element 32b overmolded onto the metal core 32 a. The overmolding may be carried out over the entire metal core 32a, as shown in fig. 4e, or over a portion of the metal core, as shown in fig. 4 f. Other types of partial overmolding may be equivalently used. The elastomer element 32b extends over a central portion of the blocking element 32. The elastomeric element 32b further comprises a deformable opening 33 to allow passage of a tool 35 during riveting, as shown in fig. 4 c.

according to a first variant, shown in fig. 1 to 4, the elastomeric element 32b has the general shape of a cone or a truncated cone or a general (truncated) cone (curved edge), as shown in the cross-section of fig. 4d, the deformable opening 33 being made at the vertex of the cone. The deformable opening 33 has, for example, a circular shape. The conical or frustoconical shape of the elastomeric element 32b allows, without any tools, to obtain a deformable opening 33 small enough to prevent impurities or fluids from entering the torsional damper 1, while allowing the introduction of a riveting tool 35 having a diameter corresponding to the base of the conical shape. The opening 33 at the apex of the cone is less than 2mm in diameter or width, for example.

Furthermore, due to its plasticity, the metal core 32a may also be arranged on a non-planar radial wall 3b, for example a radial wall 3b with a depressed portion, as shown in fig. 3, 5a and 5 b. This feature applies equally to the variants of the elastomeric element 32b that will be described in the rest of the description.

according to a second variant, shown in fig. 6a to 6c, the elastomeric element 32b has a circular or substantially circular shape. Furthermore, the elastomeric element 32b extends over a planar or substantially planar surface and has a deformable opening in the form of a groove 34 which extends over the diameter of the elastomeric element 32 b. The grooves 34 are preferably oriented in a substantially radial direction with respect to the rotational axis X of the torsional damper 1 to prevent the grooves 34 from opening due to centrifugal forces when the torsional damper 1 is used. In this second variant, the elastomeric element 32b comprises two lips 36 configured to overlap and at least partially overlap at the location of the groove 34. The two lips are generally semi-circular. At least one of the two lips has an extension of a radially oriented diameter with respect to the rotation axis X. The extension allows for a stacking width of less than 2mm, for example.

According to a third variant, shown in fig. 7a and 7b, the elastomeric element 32b differs from the second variant in that the lips 36 on each respective side of the groove 34 are configured to abut against each other without overlapping or superposing. Further, the elastic body element 32b is the same as the second variation.

According to a fourth variant, not shown, the elastomer element 32b may comprise a plurality of grooves 34, for example two perpendicular grooves 34. Each groove may extend along a diameter of the elastomeric element 32 b. Further, the elastic body element 32b is the same as the second variation.

According to a second embodiment, illustrated in fig. 8a to 8c, the blocking element 32 'comprises an elastomeric element 32' b, which is overmoulded directly on the radial wall 3b of the main element 3. The overmoulding is performed, for example, on the outside of the radial wall 3b and is retained on the radial wall 3b, for example, by an elastomer-metal adhesive. Fig. 8a to 8c show an elastic body 32' b, the shape of which corresponds to the shape of the first variant of the first embodiment (see fig. 1 to 4), but other variant shapes of the elastic body element 32 according to the first embodiment described above are equally applicable to this second embodiment.

The elastomeric elements 32b, 32' b may be made of a Hydrogenated Nitrile Butadiene Rubber (HNBR) type material. An HNBR material with an acrylonitrile content of about 33% will be particularly suitable for the thermal conditions of operation of motor vehicles.

the elastomeric elements 32b, 32 'b may be made of a hydrophobic material, or a hydrophobic treatment may be applied to 32b, 32' b. Particles of Polytetrafluoroethylene (PTFE) may be applied to the elastomeric elements 32b, 32' b, for example.

The invention also relates to a motor vehicle comprising a torsional damper as described above.

thus, the overmoulded elastomeric blocking element 32, 32 'makes it possible to limit or prevent the introduction of undesired fluids or dirt into the torsional damper 1, and in particular into the housing 3d in which the elastomeric damping means 11 are arranged, this blocking element 32, 32' being arrangeable on the radial wall 3b of the main element 3 of small thickness, in particular when used in a dual mass flywheel torsional damper 1, whose thickness is less than 2mm, and comprising a flexible main element 3, also known as a dual mass flywheel.