Torque transmitting device including pendulum damping device and vehicle powertrain

Abstract

The present application relates to a torque transmission device and a vehicle powertrain comprising a pendulum damping device wherein the torque transmission device (1) comprises a primary element (3), a secondary element (6), an elastic return member (9) cooperating on the one hand with the primary element (3) and on the other hand with the secondary element (6) to limit rotation of the secondary element (6) relative to the primary element (3) about an axis of rotation (X), the utility model relates to a vibration damper (1) comprising at least one elastic restoring member (9) extending radially between a radially inner circumference (9i) and a radially outer circumference (9e), and a pendulum damping device (10) comprising a support (12) and a pendulum body (13), the support (12) being axially aligned with the at least one elastic restoring member (9), characterized in that the pendulum body (13) comprises an oscillating mass (14) positioned axially on one side of the support (12), the radially outer edge (14e) is located at a first radial height (H1), and the radially inner circumference (9i) is located at a second radial height (H2) which is smaller than the first radial height (H1).

Description

Technical Field

[0001] The utility model relates to a torque transmission device with a pendulum damping device, in particular a dual-mass flywheel. The torque transmission device is integrated into a motor vehicle transmission system, for example. Background Art

[0002] Such a pendulum damping device is usually realized as a support and one or more pendulum bodies movable relative to the support, the movement of each pendulum body relative to the support being guided by one or two rolling members cooperating on the one hand with a raceway integral with the support and on the other hand with a raceway integral with the pendulum body. Each pendulum body comprises, for example, two pendulum masses riveted together.

[0003] The combination of a pendulum damping device on a dual mass flywheel makes it possible to meet the stringent requirements regarding filtering the vibrations emanating from the vehicle's prime mover, whether it is an internal combustion engine, an electric motor or a mixture of the two. In particular, these vibrations can enter the gearbox and cause shock vibrations and undesirable noise therein. It is therefore preferred to provide a means for filtering out these vibrations.

[0004] However, there are stricter requirements for this filter performance. Utility Model Content

[0005] To this end, the utility model proposes a torque transmission device, such as a dual-mass flywheel, comprising:

[0006] - a main element capable of being fastened to the crankshaft of an internal combustion engine and / or to an electric motor,

[0007] - secondary components,

[0008] at least one elastic return member cooperating with the primary element on the one hand and with the secondary element on the other hand so as to limit the rotation of the secondary element relative to the primary element about the axis of rotation X, the at least one elastic return member extending radially between a radially inner periphery and a radially outer periphery, and

[0009] - a pendulum damping device comprising a support rotatable about an axis X and a pendulum, the displacement of the pendulum relative to the support being guided by at least one rolling element, the support being axially aligned with at least one elastic return element,

[0010] wherein the pendulum comprises at least one oscillating mass positioned axially on one side of the support and extending radially between a radially inner edge and a radially outer edge, and

[0011] The radial outer edge of the oscillating mass is located at a first radial height, and the radial inner periphery is located at a second radial height which is smaller than the first radial height.

[0012] In other words, the radially outer edge of the at least one oscillating mass is radially further away from the axis of rotation X than the radially inner periphery of the at least one elastic return member.

[0013] Note that the first radial height is measured between the axis of rotation and a point on the radial outer edge that is located at a maximum distance from the axis of rotation.

[0014] The radial outer edge may have a surface parallel to the axis of rotation. Alternatively or in addition, the radial outer edge may have a surface that is inclined relative to the axis of rotation, that is to say forms a non-zero angle relative to the axis of rotation. The angle is, for example, greater than 5°, or even greater than 10°, in particular between 20° and 80°.

[0015] In the context of the present application, the radial inner circumference or radial outer circumference of at least one elastic reset member means the set of points of the outer envelope of the elastic reset member, which are located in the plane of the radial cross-section near the point of the reset member located at the minimum distance from the rotation axis, or the set of points of the outer envelope of the elastic reset member, which are located in the plane of the radial cross-section near the point of the reset member located at the maximum distance from the rotation axis.

[0016] In the plane of the radial section, the set of points is in particular located on each side of a point on the return member at the smallest distance from the axis of rotation, or on each side of a point on the elastic return member at the largest distance from the axis of rotation. The second radial height is in particular measured between the axis of rotation and a point on the elastic return member at the smallest distance from said axis of rotation.

[0017] The improvement of the filtering performance of the torque transmission device is achieved by improving the pendulum damping device. The radial height difference between the radial outer edge of the oscillating mass and the radial inner periphery of the elastic return member makes it possible to enlarge the size of the oscillating mass without increasing the total volume of the torque transmission device. In addition, the shape of the oscillating mass according to the utility model makes it possible to increase its total weight, thereby improving the filtering capacity of the pendulum damping device. The shape of the oscillating mass according to the utility model also makes it possible to increase the radius at which its center of gravity is located, thereby increasing its stroke, which likewise makes it possible to improve the filtering capacity of the pendulum damping device. In addition, this structure offers the advantages of being strong and relatively noiseless, in particular compared to a pendulum damping device in which the support is axially offset relative to the elastic return member. Finally, this solution is particularly compact and economical.

[0018] The primary element is the primary flywheel and the secondary element is the secondary flywheel.

[0019] The device according to the utility model may also have one or more of the following optional features:

[0020] The support is integrally axially aligned with the at least one resilient return member;

[0021] the central axis of the at least one elastic return member is located at a third radial height, which is in particular greater than the first radial height; thus, the ratio between the performance of the pendulum damping device and the complexity of the structure is optimized - the first and third radial heights are for example measured in the same cross-sectional plane;

[0022] The radially outer edge of at least one oscillating mass is axially offset from at least one elastic return member; thereby, the filtering performance of the pendulum damping device is improved while its impact on the axial volume of the torque transmission device is limited;

[0023] The at least one oscillating mass can be produced by pressing; this method is particularly suitable for giving the at least one oscillating mass its shape;

[0024] at least one oscillating mass comprising an upper portion including a radially outer edge, a lower portion including a radially inner edge, and an intermediate portion radially between the upper portion and the lower portion, and wherein the lower portion is axially aligned with the at least one resilient return member;

[0025] The lower part of the at least one oscillating mass is axially aligned with the at least one elastic return member; the lower part of the at least one oscillating mass is axially aligned integrally with the at least one elastic return member; thus, the axial volume of the torque transmission device is optimized while maintaining the filtering performance of the pendulum damping device;

[0026] The upper portion at least partially surrounds the outer contour of the at least one elastic return member; the upper portion conforms to the outer contour, also called outer shape, of the at least one elastic return member so as to limit the axial and radial volume of the torque transmission device while maximizing its filtering capacity;

[0027] There is a gap between the upper part of the at least one oscillating mass and the at least one elastic return member; thus, even in operation, there is no contact between the elastic return member and the oscillating mass;

[0028] at least one oscillating mass has a variable thickness; thus, at least one oscillating mass presents one or more local thickness reductions, thereby locally increasing the gap between the at least one oscillating mass and the at least one elastic return member;

[0029] The at least one oscillating mass may be chamfered and / or rounded in order to produce a local reduction in the thickness of the at least one oscillating mass; thus, an increase in the gap existing between the at least one oscillating mass and the at least one elastic return member may be easily achieved;

[0030] The upper part is axially located between the main element and the at least one elastic return member; thus, the volume of the torque transmission device, in particular the radial volume, is optimized;

[0031] The upper and lower parts of at least one oscillating mass are axially offset; thus, the volume of the torque transmission device, in particular the radial volume, is optimized;

[0032] The radial inner edge of the at least one oscillating mass is located at a fourth radial height which is less than the second radial height; thus, the radial volume of the torque transmission device is optimized while maintaining the filtering performance of the pendulum damping device;

[0033] At least one rolling element is designed to cooperate with a support raceway integral with the support and a pendulum raceway integral with the pendulum, the support raceway being integrally axially aligned with at least one elastic return element; thus, the axial volume of the torque transmission device is optimized while maintaining the filtering performance of the pendulum damping device;

[0034] At least one rolling element is designed to cooperate with a support raceway integral with the support and a pendulum raceway integral with the pendulum, the pendulum raceway being integrally axially aligned with at least one elastic return element; thus, the axial volume of the torque transmission device is optimized while maintaining the filtering performance of the pendulum damping device;

[0035] The pendulum comprises a first oscillating mass positioned axially on one side of the support and a second oscillating mass positioned axially on the other side of the support, the first and second oscillating masses being fixed to each other by at least one connecting member,

[0036] wherein the main element fixed to the cover forms a housing designed to accommodate at least one elastic return member,

[0037] and wherein the upper part of the second oscillating mass is located axially between the cover and the at least one elastic return member; thus, the filtering capacity is optimized;

[0038] The first and second oscillating masses encompass between 10% and 50% of the outer contour of the at least one elastic return member; the filtering performance of the pendulum damping device is improved;

[0039] The lower parts of the first and second oscillating masses are axially aligned with the at least one elastic return member; the lower parts of the first and second oscillating masses are axially aligned integrally with the at least one elastic return member; thus, the axial volume of the torque transmission device is optimized while maintaining the filtering performance of the pendulum damping device;

[0040] the housing contains lubricant to a level radially further away from the axis of rotation X than the radially outer edge of at least one oscillating mass; the amount of lubricant present in the housing is therefore optimal for protection without interfering with the at least one elastic return member and the pendulum damping means;

[0041] The main element and / or the cover are locally configured to create a receiving space for receiving the upper part of the first or second oscillating mass; thus, the risk of collision of the main element and / or the cover with the first or second oscillating mass is limited;

[0042] The local configuration of the main element and / or the cover is achieved by bending and / or machining;

[0043] The main element and / or the cover has at least one chamfered or rounded corner portion to achieve local configuration;

[0044] the main element and / or the cover comprises at least one bearing section designed to allow the at least one elastic return member to bear tangentially against the main element and / or the cover; the bearing section is designed to be remote from the at least one oscillating mass;

[0045] The device further comprises an intermediate part which is designed to form at least one bearing section, against which the at least one elastic return member can bear tangentially; the bearing section being designed to be remote from the at least one oscillating mass;

[0046] The intermediate part may be riveted to the main element and / or the cover; the intermediate part may be welded to the main element and / or the cover; the intermediate part may be bonded to the main element and / or the cover; the intermediate part may be push-fitted to the main element and / or the cover;

[0047] At least one oscillating mass is made of two parts, for example of two thin plates;

[0048] The two parts are identical; the two parts are assembled axially; creating the at least one oscillating mass in two parts makes it easier to perform the pressing operation for giving the at least one oscillating mass its shape;

[0049] Another subject of the utility model is a vehicle power system, comprising:

[0050] The internal combustion engine, electric motor, or hybrid prime mover that powers the vehicle, and

[0051] According to the torque transmission device of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Other features and advantages of the present invention will become more apparent by reading the following description and studying the accompanying drawings, in which:

[0053] Figure 1 A partial radial cross-sectional view of a torque transmission device according to the present invention is shown;

[0054] Figure 2 Depicted in different radial sections Figure 1 A second view of the torque transmitting device,

[0055] Figure 3 is similar to Figure 1 , but with a first variant embodiment of the oscillating mass of the pendulum damping device,

[0056] Figure 4 is similar to Figure 2 , but with a first embodiment variant of the oscillating mass of the pendulum damping device and with an intermediate part.

[0057] In different drawings, the same reference numbers are used to denote the same or similar components. DETAILED DESCRIPTION

[0058] Unless otherwise specified, "axially" means "parallel to the axis of rotation X of the support", "radial" means "along a transverse axis intersecting the axis of rotation of the support", and "angularly" or "circumferentially" or "tangentially" means "around the axis of rotation of the support".

[0059] The thickness is measured along the axis X of rotation.

[0060] “Eccentric support” refers to a support force having a component away from the axis X of rotation.

[0061] “Vehicle” is to be understood as a motor vehicle, which includes not only passenger cars but also industrial vehicles, in particular heavy goods vehicles, public transport vehicles or agricultural vehicles, but also any transport unit which is able to move living beings and / or objects from one point to another.

[0062] A "pendulum" is an oscillating mass mounted on a support in response to the non-cyclic behavior of a vehicle engine or motor. A pendulum is usually constructed of a pair of oscillating masses or "pendulum masses" extending in a manner that clamps a support and is rigidly fixed to each other. The pendulum also includes at least one connecting member, also called a spacer, designed to mate the pair of oscillating masses with each other. The pendulum can also be constructed of a single oscillating mass. The single oscillating mass can be clamped between two supports.

[0063] "Braking" means the frictional action that resists motion without stopping it completely.

[0064] When two components are permanently fixed relative to each other, they are said to be "rigidly secured" or "coupled." Such securing may be the result of a first component being secured to a second component directly or through one or more intermediate components.

[0065] The rest position of the pendulum damping device is that in which the pendulum body is subjected to the centrifugal forces but not to the torsional vibrations caused by the non-cyclic behavior of the internal combustion engine, electric motor or hybrid prime mover.

[0066] The pendulum is said to be "supported by centrifugal force" when the speed of rotation of the support is sufficient to keep the pendulum pressed radially outwardly against the rolling elements and, through the rolling elements, against the support.

[0067] Unless otherwise indicated, the verbs "comprise", "have" or "include" must be interpreted broadly, ie without limitation.

[0068] Figure 1 A torque transmitting device 1 is shown, which in this case is a dual mass flywheel.

[0069] The dual mass flywheel is integrated into a vehicle powertrain which also includes an internal combustion engine, an electric motor or a hybrid prime mover.

[0070] In a known manner, the dual mass flywheel comprises a main element, for example a primary flywheel 3. The primary flywheel 3 may comprise a flange integrally fixed to a cover 4. The cover 4 may be a starter ring gear. The flange and the cover 4 may be rigidly fixed to each other at their radial periphery so as to at least partially define an internal housing 5. At least one elastic return member 9, for example a curved elastic return member, such as a helical coil spring, may be mounted in the internal housing 5. Preferably, a plurality of elastic return members 9 may be mounted in the housing 5.

[0071] At least one elastic return member 9 extends circumferentially and bears at a first end against the primary flywheel 3 and / or the cover 4 and at a second end against a flange 11 belonging to a secondary element such as the secondary flywheel 6 .

[0072] In the cross-sectional plane, at least one elastic reset member 9 extends radially between the radial inner periphery 9i and the radial outer periphery 9e. At least one elastic reset member 9 may also define a center point P, which is radially located between the radial inner periphery 9i and the radial outer periphery 9e of the elastic reset member 9. More specifically, the center point P may be equidistant between the radial inner periphery 9i and the radial outer periphery 9e. The central axis of the elastic reset member 9 formed by the set of center points P may therefore be defined.

[0073] At least one elastic return member 9 makes it possible to establish a rotational movement of limited amplitude about the axis of rotation X of the secondary flywheel 6 relative to the primary flywheel 3 .

[0074] from Figure 1 As can be seen in the figure, the flange 11 is riveted to the output hub 7 of the secondary flywheel 6. The flange 11 can be riveted to the output hub 7 using at least one rivet. Preferably, a plurality of rivets are provided, each rivet being successive in the circumferential direction, while fixing the flange 11 and the output hub 7 together.

[0075] The output hub 7 has, for example, splines allowing it to be pushed onto the shaft.

[0076] According to the present invention, a pendulum damping device 10 is provided. The pendulum damping device 10 has at least one pendulum body 13 mounted on a support 12. The flange 11 of the secondary flywheel 6 can form the support 12. The device 10 preferably includes a plurality of pendulum bodies 13 mounted on the support 12. Each pendulum body includes at least one oscillating mass 14.

[0077] In the example shown, each pendulum comprises a first and a second oscillating mass 14, which are paired by at least one connecting member generally referred to as a "spacer" 20. Each pendulum 13 may comprise a single spacer. Alternatively, each pendulum 13 may comprise two spacers 20.

[0078] Each spacer 20 can be riveted to the oscillating mass 14 of the same pendulum 13. Alternatively, each spacer 20 can be press-fitted into the oscillating mass 14 of one and the same pendulum 13.

[0079] Each spacer 20 may include a body extending radially and circumferentially and having an overall arcuate shape. The body extends radially between a radially outer upper surface 21 and a radially inner lower surface 22. The body extends circumferentially between a first circumferential end and a second circumferential end.

[0080] Each oscillating mass 14 comprises a body extending radially and circumferentially and having a generally arcuate shape. The body extends radially between a radially inner edge 14 i and a radially outer edge 14 e of the oscillating mass 14 .

[0081] exist Figure 1 In the example shown, the radially outer edge 14e of the oscillating mass 14 comprises a surface that is inclined relative to the rotation axis X. As shown, the radially outer edge 14e may be at an angle relative to the rotation axis X of between 20° and 80°.

[0082] The radially outer edge 14e may be located at a first radial distance H1 from the rotation axis X. The body extends circumferentially between a first circumferential end and a second circumferential end. The oscillating masses 14 are located on each side of the support 12 and axially face each other.

[0083] The pendulum damping device 10 is, for example, substantially radially below the at least one elastic return member 9. The support 12 may be radially below the at least one elastic return member 9. More specifically, the support 12 may be integrally axially aligned with the at least one elastic return member 9. More specifically, the support 12 may be integrally axially aligned with a plurality of elastic return members 9. The flange 11 of the secondary flywheel 6 may form the support 12.

[0084] The body of each oscillating mass 14 may at least partially surround at least one elastic return member 9. The body of each oscillating mass 14 may at least partially surround one or two of the plurality of elastic return members 9. Each oscillating mass 14 may radially surround between 5% and 25%, preferably between 10% and 20%, of the outer contour of at least one elastic return member 9. The first and second oscillating masses 14 of the pendulum 13 radially surround between 10% and 50%, preferably between 10% and 20% of the outer contour of at least one elastic return member 9.

[0085] More specifically, the radial inner periphery 9i of the at least one elastic return member 9 may be located at a second radial height H2 from the rotation axis X. The first radial height H1 may be greater than the second radial height H2. Thus, the radial outer edge 14e of the oscillating mass 14 may be radially aligned with the at least one elastic return member 9 and axially offset.

[0086] More specifically, the center axis P of the at least one elastic reset member 9 can be located at a third radial height H3 from the rotation axis X. Note that this height is measured on the same cross section as the height H1. The first radial height H1 can be smaller than the third radial height H3. Thus, the position of the radial outer edge 14e of the oscillating mass 14 can be optimized.

[0087] The body of each oscillating mass 14 may radially include three parts: a lower part 141 including a radial inner edge 14 i , an upper part 142 including a radial outer edge 14 e , and a middle part 143 radially located between the lower part 141 and the upper part 142 .

[0088] The lower part 141 may be straight. The lower part 141 may face the support 12. The middle part 143 may be curved. The middle part 143 may form a connection between the lower part and the upper part. The upper part 142 may conform to the shape of the at least one elastic reset member 9. More specifically, the upper part 142 may conform to the shape of the outer contour of the at least one elastic reset member 9. The upper part 142 may have the shape of a part of a spring coil. The middle part and the upper part may be located at a certain distance from the at least one elastic reset member 9. Therefore, the gap between the oscillating mass and the at least one elastic reset member means that the operation of the torque transmission device 1 is not disturbed.

[0089] The oscillating mass 14 can be produced by a pressing operation. The pressing operation is particularly suitable for giving the oscillating mass 14, in particular the upper part 142 and the middle part 143 of the oscillating mass 14, its shape.

[0090] The oscillating mass 14 may have a variable thickness. More specifically, the upper portion 142 of the oscillating mass 14 may present a smaller thickness. Such a reduction in thickness of the upper portion 142 makes it possible to increase the gap between the oscillating mass 14 and the at least one elastic return member 9. The middle portion 143 and the upper portion 142 may have the same thickness. Alternatively, the oscillating mass 14 may present one or more local thickness reductions, preferably on the upper portion 142. Such or these reductions in thickness may be achieved by chamfering and / or rounding.

[0091] The oscillating mass 14 can be made of two parts, for example of two thin plates. The two parts can be identical. The two parts can be assembled axially.

[0092] The radial inner edge 14i of the oscillating mass 14 can be located at a fourth radial height H4. The fourth radial height H4 can be less than the second radial height H2. The fourth radial height H4 can be less than the third radial height H3. Therefore, the lower portion 141 of the oscillating mass 14 is axially aligned and radially offset with at least one elastic reset member 9, and the upper portion 142 of the oscillating mass 14 is radially aligned and axially offset with at least one elastic reset member 9. The upper portion 142 and the lower portion 141 of the oscillating mass 14 can be axially offset. This combination allows the pendulum damping device to be partially accommodated below at least one elastic reset member 9, so that the axial space can be maximized (space saving) while increasing the size of the oscillating mass 14 of the pendulum damping device so as to increase its filtering capacity.

[0093] The upper portion 142 of the first oscillating mass 14 may be located axially between the primary flywheel 3 and the at least one elastic return member 9. The upper portion 142 of the second oscillating mass 14 may be located axially between the at least one elastic return member 9 and the cover 4.

[0094] The primary flywheel 3 can be locally configured to create a housing space to accommodate the upper part 142 of the first oscillating mass 14. This space makes it possible to limit the risk of the first oscillating mass 14 and the primary flywheel 3 colliding with each other. This configuration operation can be performed by bending. Alternatively, it can be performed using machining. Alternatively, the primary flywheel 3 can be locally chamfered or rounded in order to create a housing space.

[0095] The primary flywheel 3 may further comprise at least one bearing section 8. The bearing section 8 may be designed to allow the at least one elastic return member 9 to bear tangentially against it. The bearing section is designed to be remote from the first oscillating mass 14.

[0096] The cover 4 can be locally configured to create a housing space to accommodate the upper part 142 of the second oscillating mass 14. This space makes it possible to limit the risk of the second oscillating mass 14 and the cover 4 colliding with each other. This configuration operation can be performed by bending. Alternatively, it can be performed using machining. Alternatively, the cover 4 can be locally chamfered or rounded in order to create a housing space.

[0097] The cover 4 may also comprise at least one bearing section 8 . The bearing section 8 may be designed to allow the at least one elastic return member 9 to bear tangentially against it. The bearing section is designed to be remote from the second oscillating mass 14 .

[0098] Alternatively, the torque transmission device 1 further comprises an intermediate component 80. The intermediate component 80 can be designed to form a bearing section 8 for the at least one elastic return member 9 to bear against. The intermediate component 80 can be designed to be remote from the first and second oscillating masses 14.

[0099] The intermediate component 80 may be riveted to the primary flywheel 3 and / or the cover 4. Alternatively, the intermediate component 80 may be welded to the primary flywheel 3 and / or the cover 4. Alternatively, the intermediate component 80 may be bonded to the primary flywheel 3 and / or the cover 4. Alternatively, the intermediate component 80 may be press-fitted to the primary flywheel 3 and / or the cover 4.

[0100] In the example considered, the support 12 has a generally annular shape made from cut sheet metal, typically steel, with a thickness typically less than 10 mm (millimeters), preferably less than 9 mm and preferably less than 8 mm.

[0101] The support member 12 extends axially between two opposing side surfaces 16. The two side surfaces 16 may be planar. The two side surfaces 16 may extend between a radially inner edge and a radially outer edge. The radially inner edge may generally be circular. At least one protrusion 17 may extend radially from the radially outer edge. The at least one protrusion may be circumferentially located between two of the plurality of elastic reset members 9. The at least one protrusion 17 allows torque to be transmitted from the plurality of elastic reset members 9 to the support member 12.

[0102] At least one hole 15 passes through the support member 12 in the thickness direction of the support member 12. Preferably, the number of holes 15 passing through the support member 12 is the same as the number of pendulum bodies 13. Each hole 15 defines an open space inside the support member 12. The holes 15 may be evenly distributed over the entire circumference of the support member 12. Each spacer 20 may pass through the hole 15. Each spacer 20 may be completely accommodated within the thickness of the hole 15.

[0103] The device 10 also comprises at least one rolling element 40 , for example a roller. Each pendulum 13 is mounted in a conventional manner so as to be able to oscillate on the support 12 , for example by means of a single rolling element 40 .

[0104] Preferably, each pendulum 13 is mounted to be able to swing on the support 12 by means of two rolling members 40. The two rolling members 40 may pass through the same hole 15 of the support 12 and guide the movement of one or more oscillating masses 14 of the pendulum 13 relative to the support 12. Alternatively, each rolling member 40 may pass through a corresponding hole 15 of the support and guide the movement of one or more oscillating masses 14 relative to the support 12.

[0105] When the pendulum 13 is supported by centrifugal force, each rolling member 40 can roll along the support member raceway integral with the support member 12. When the pendulum 13 is supported by centrifugal force, each rolling member 40 can roll along the pendulum raceway 42 integral with the pendulum 13. The edge of the hole 15, in particular the radially outer portion of the edge, can define the support member raceway. When two rolling members 40 are in the same hole 15, the spacer 20 can form one or more pendulum raceways 42. More specifically, the radially outer upper surface 21 of the spacer 20 can form the pendulum raceway 42.

[0106] As a variant, each oscillating mass 14 of the pendulum 13 may define a pendulum raceway 42 on which the rolling members 40 of the pendulum damping device 10 run in order to guide the movement of the pendulum 13. Each rolling member 40 may then comprise, axially in succession, a portion arranged in the opening of the first oscillating mass 14 and cooperating with the pendulum raceway 42 formed by a portion of the contour of this opening, a portion arranged in the hole 15 of the support 12 and cooperating with the support raceway formed by a portion of the contour of this hole 15, and a portion arranged in the opening of the second oscillating mass 14 and cooperating with the pendulum raceway 42 formed by a portion of the contour of this opening.

[0107] The shape of the support member raceway and the pendulum body raceway 42 allows each pendulum body 13 to move relative to the support member 12: translation around an imaginary axis parallel to the rotation axis X of the support member 12, and rotation around the center of gravity of the pendulum body 13, this movement is also called "combined movement" and is disclosed, for example, in the application DE 10 2011 086532.

[0108] In a variant, the aforementioned support and pendulum raceway 42 may be shaped so that each pendulum 13 can translate only relative to the support 12 about an imaginary axis parallel to the axis of rotation X of the support 12 .

[0109] Each rolling member 40 can be freely mounted in the hole 15 of the support 12. Each rolling member 40 can have a rolling surface designed to at least partially contact the support raceway and the pendulum raceway 42. Each rolling member 40 can cooperate with the pendulum raceway 42 and the support raceway only through its outer rolling surface.

[0110] Each rolling member 40 may be a cylinder with a constant radius. Each rolling member 40 may be a rolling member passing through a hole. Each rolling member 40 may be a rolling member not passing through a hole.

[0111] The pendulums 13 are preferably evenly distributed angularly around the axis X. Preferably, their number is two. Their number may be less than four. All the pendulums 13 may be circumferentially continuous. Thus, the device 10 may comprise a plurality of planes perpendicular to the axis of rotation X, in each of which all the pendulums 13 are arranged.

[0112] The pendulum damping device 10 can be accommodated in a closed housing 5. The dual mass flywheel can also include at least one sealing element 2. The role of the sealing element is to protect the pendulum damping device 10 and the at least one elastic reset member 9 from external attacks and also provide sealing. Therefore, the sealing element 2 helps to define and seal the closed housing 5. The housing 5 is at least partially sealed. The housing 5 can be completely sealed. The closed housing 5 can be at least partially filled with a lubricant, such as lubricating oil and / or grease, to ensure the correct operation of the pendulum damping device and / or the at least one elastic reset member 9. When the pendulum damping device 10 is in a stationary position, the lubricant can have a lubricant level located at a radial height from the rotation axis X. The radial height of the lubricant level can be greater than the first radial height H1. Therefore, the amount of lubricant present in the housing is optimal for protection without interfering with at least one elastic reset member and the pendulum damping device.

[0113] The dual mass flywheel may comprise two sealing elements 2. The first sealing element 2 may extend radially towards the first oscillating mass 14 of the pendulum 13, and the second sealing element 2 may extend radially towards the second oscillating mass of the pendulum 13. Furthermore, the first and second sealing elements 2 are axially offset from each other relative to the first and second oscillating masses 14.

[0114] from Figure 2 and 3 It can also be seen in FIG. 1 that axial pads 50 are provided. The axial pads 50 can be carried by the oscillating masses 14 , for example by means of clip fastening plates, and are designed to absorb axial shocks between these oscillating masses 14 and the support 12 .

[0115] exist Figure 3 and 4 In the embodiment of FIG. 1 , the radially outer edge 14 e of the oscillating mass 14 comprises a surface parallel to the axis of rotation.

[0116] Of course, the present invention is not limited to the above-mentioned specific embodiment variants. Specifically, the combination of the above-mentioned various embodiments is possible.

Claims

1. A torque transmission device (1), comprising: - a main element (3) which can be fixed to the crankshaft of the internal combustion engine and / or to the electric motor, - a secondary element (6), - at least one elastic return member (9) cooperating with the primary element (3) on the one hand and with the secondary element (6) on the other hand so as to limit the rotation of the secondary element (6) relative to the primary element (3) about the axis of rotation (X), the at least one elastic return member extending radially between a radially inner periphery (9i) and a radially outer periphery (9e), and - a pendulum damping device (10) comprising a support (12) rotatable about an axis (X) and a pendulum (13), the displacement of the pendulum relative to the support being guided by at least one rolling member (40), the support (12) being axially aligned with at least one elastic return member (9), Characterized in that the pendulum (13) comprises at least one oscillating mass (14) axially positioned on one side of the support (12) and extending radially between a radially inner edge (14i) and a radially outer edge (14e), The radial outer edge (14e) is located at a first radial height (H1), the radial inner periphery (9i) is located at a second radial height (H2) which is smaller than the first radial height (H1), and The radially inner edge (14i) of the at least one oscillating mass (14) is located at a fourth radial height (H4) which is smaller than the second radial height (H2).

2. The torque transmission device (1) according to claim 1, characterized in that The central axis of the at least one elastic reset member (9) is located at a third radial height (H3), which is greater than the first radial height (H1).

3. The torque transmission device (1) according to claim 1, characterized in that A radially outer edge (14e) of the at least one oscillating mass (14) is axially offset from the at least one elastic return member (9).

4. The torque transmission device (1) according to claim 1, characterized in that The at least one oscillating mass (14) comprises an upper portion (142) including the radially outer edge (14e), a lower portion (141) including the radially inner edge (14i), and an intermediate portion (143) radially between the upper portion and the lower portion, And the lower portion (141) is axially aligned with at least one elastic return member (9).

5. The torque transmission device (1) according to claim 4, characterized in that The upper portion (142) at least partially surrounds the outer contour of the at least one elastic return member (9).

6. The torque transmission device (1) according to claim 4, characterized in that There is a gap between the upper part (142) of the at least one oscillating mass (14) and the at least one elastic return member (9).

7. The torque transmission device (1) according to claim 4, characterized in that The upper portion (142) is axially located between the main element (3) and at least one elastic return member (9).

8. The torque transmission device (1) according to claim 4, characterized in that The pendulum (13) comprises a first oscillating mass axially located on one side of the support (12) and a second oscillating mass axially located on the other side of the support (12), the first oscillating mass and the second oscillating mass being fixed to each other via at least one connecting member (20). The main element (3) fixed to the cover (4) forms a housing (5) designed to house at least one elastic return member (9), And the upper part of the second oscillating mass is located axially between the cover (4) and the at least one elastic return member (9).

9. The torque transmission device (1) according to claim 8, characterized in that The main element (3) and / or the cover (4) are locally configured to create a receiving space for receiving an upper part (142) of the first or second oscillating mass.

10. The torque transmission device (1) according to claim 8, characterized in that The main element (3) and / or the cover (4) comprises at least one bearing section (8) designed to allow the at least one elastic return member (9) to bear tangentially against the main element (3) and / or the cover (4).

11. The torque transmission device (1) according to claim 1, characterized in that It further comprises an intermediate component (80) which is designed to form at least one supporting section (8), the at least one elastic reset member (9) being capable of tangentially supporting against the at least one supporting section (8), the intermediate component being capable of being riveted, welded, bonded or press-fitted to the main element and / or the cover.

12. The torque transmission device (1) according to claim 1, characterized in that The at least one rolling member (40) is designed to cooperate with a support member raceway integral with the support member (12) and a pendulum body raceway (42) integral with the pendulum body (13), and the support member raceway is integrally axially aligned with the at least one elastic reset member (9).

13. A vehicle powertrain, comprising: The internal combustion engine, electric motor, or hybrid prime mover that powers the vehicle, and A torque transmission device (1) according to any one of claims 1 to 12.

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