Torsional damping device

Abstract

A torsional damping device (1) comprises a first rotational torque transmission element (7) provided with a first accommodating portion (17), a second rotational torque transmission element (9, 10), and an elastic device (11) comprising a first spring (13) installed in the first accommodating portion (17), wherein the first spring (13) comprises a first end (131) and an opposite second end (132), a first flange (30") comprising a first compression lug (32), and a second flange (40") comprising a first compression lug (42). When the first rotational element (7) is capable of rotating in a positive direction, the first rotational element (7) moves the first end (131) of the first spring (13) toward the second end of the first spring via the first compression lug of the first flange (30"); and when the first rotational element (7) is capable of rotating in a reverse direction, the first rotational element (7) moves the second end (132) of the first spring (13) toward the first end of the first spring via the first compression lug of the second flange (40")

Description

Technical Field

[0001] The invention relates to the field of torque transmission in motorized devices and to a torsional damping device for a vehicle driveline. Background Art

[0002] Motor vehicles often feature such torsional damping devices, which can be incorporated into various elements of the drivetrain. For example, dual-mass engine flywheels, clutch plates, or torque limiters can include torsional damping devices to filter out the engine's non-cyclic behavior and other torsional vibrations. This filtering is typically performed by one or more torsional dampers, which are spring-damper combinations that operate in a torsional manner and, during torque transfer, allow relative rotational movement between a first rotating torque-transmitting element coupled upstream of the drivetrain and a second rotating torque-transmitting element coupled downstream of the drivetrain. This relative rotation can be permitted by springs arranged in series. During torque transfer, particularly when travel approaches 0°, the load-bearing capacity of these springs shifts, allowing them to compress between the first and second rotating torque-transmitting elements. This transfer causes relative motion, which, under the influence of centrifugal forces, leads to radial friction, which can damage the springs and significantly reduce the damping device's filtering performance. Furthermore, this shift in load capacity is a source of noise. Summary of the Invention

[0003] The object of the present invention is to improve the torsional damping devices of the prior art by proposing a device that is insensitive to centrifugal forces.

[0004] To this end, the present invention relates to a torsional damping device for a vehicle drive train, comprising:

[0005] a first rotary torque transmitting element provided with a first housing,

[0006] - a second rotary torque transmitting element,

[0007] - elastic means, which are interposed between the first rotating element and the second rotating element and, when deformed, allow the first and second rotating elements to rotate relative to each other about the rotation axis, the elastic means comprising at least a first spring mounted in a first housing, the first spring comprising a first end and an opposite second end, the first rotating element being movable between a rest position and an active position, in which the springs of the elastic means are not compressed and in which the at least one spring of the elastic means is compressed,

[0008] - a first flange comprising a first compression tab arranged circumferentially between the first end of the first spring and the first rotating element,

[0009] a second flange comprising a first compression tab arranged circumferentially between the second end of the first spring and the first rotating element,

[0010] When the first rotating element is rotatable in a positive direction from a stationary position, the first rotating element moves the first end of the first spring toward the second end of the first spring via the first compression protrusion of the first flange.

[0011] And wherein, when the first rotating element is rotatable in a negative direction from a rest position, the first rotating element moves the second end of the first spring toward the first end of the first spring via the first compression tab of the second flange.

[0012] In this way, suppressing the transfer of load-bearing capacity during torque transmission reduces wear on the springs and components in contact with them, and reduces noise during device operation. Suppressing the transfer of load-bearing capacity also reduces or even eliminates radial friction, resulting in optimal damping performance. The presence of the first and second flanges guiding the springs allows the first and second rotating elements to transmit torque solely, without requiring a spring or any intermediate element between the first rotating element and at least one spring. This makes it possible to standardize the first rotating element and enhance its strength.

[0013] In addition, the first flange and the second flange do not oppose any reaction of the transmission of the torque transmission. Like this, the size of the flange can be designed to be simpler and the manufacture is less expensive.

[0014] The positive direction is the positive direction of the triangle, also known as the counterclockwise direction. The negative direction is the negative direction of the triangle, also known as the clockwise direction. The positive direction is opposite to the negative direction.

[0015] The torque transmitting device may have the following additional features, alone or in combination:

[0016] The first compression tab of the first flange includes at least one retaining element designed to radially retain the first spring. The retaining element is designed to radially retain the spring when the spring is subjected to centrifugal forces. The retaining element prevents the spring from being lost. When the first rotating element is able to move in the positive direction from its stationary position, the retaining element assists in the movement of the first end of the first spring via the first flange. The retaining element is a protrusion extending radially from the first compression tab in the direction of the first spring, between the end fixed to the first compression tab and the free end. The retaining element is an outer edge extending radially from the upper end of the first compression tab, between the end fixed to the first compression tab and the free end. The retaining element comprises a protrusion and an outer edge.

[0017] The elastic device also includes a second spring installed in the first receiving portion, the second spring including a first end and an opposite second end, the first compression protrusion of the second flange is circumferentially arranged between the second end of the second spring and the first rotating element, and when the first rotating element is rotatable in a negative direction from a stationary position, the first rotating element moves the second end of the second spring toward the first end of the second spring via the first compression protrusion of the second flange.

[0018] In this way, increasing the number of springs of the elastic means makes it possible to enhance the damping performance while still maintaining the advantages mentioned above.

[0019] The first spring and the second spring are arranged in series via a phasing element connecting the second end of the first spring and the first end of the second spring.

[0020] The first rotating element is provided with a second accommodating portion, and the elastic device also includes a third spring radially opposite to the first spring, the third spring is installed in the second accommodating portion and includes a first end and an opposite second end, the first flange and the second flange each include a second compression protrusion, and the second compression protrusion is respectively circumferentially arranged between the first rotating element and the first end of the third spring or the second end of the third spring, when the first rotating element is able to rotate in a positive direction from a stationary position, the first rotating element moves the first end of the third spring toward the second end of the third spring via the second compression protrusion of the first flange, and when the first rotating element is able to rotate in a negative direction from a stationary position, the first rotating element moves the second end of the third spring toward the first end of the third spring via the second compression protrusion of the second flange.

[0021] Thus, the springs are arranged in pairs that are diametrically opposed. In other words, the springs are radially aligned in pairs, or the springs are located in pairs on opposite sides relative to the axis of rotation. Thus, each flange is connected to one end of two diametrically opposed springs.

[0022] This configuration of the device allows the first and second compression tabs of the same flange to be subjected to two centrifugal forces from the spring mass under the influence of rotational speed. These two centrifugal forces are equal in magnitude and opposite in direction. In this way, the deformations associated with these two centrifugal forces compensate for each other, and radial forces no longer act on the first and / or second rotating elements, even when the rotation of the first rotating element changes from positive to negative, or vice versa. Consequently, the balance of centrifugal forces within the device eliminates friction and, therefore, the deterioration of filtering performance associated with friction. The device becomes insensitive to the adverse effects of centrifugal forces.

[0023] The first rotating element is provided with a second receiving portion,

[0024] The elastic device further includes a third spring radially opposite to the first spring and a fourth spring radially opposite to the second spring, the third and fourth springs being mounted in the second receiving portion and each including a first end and an opposite second end,

[0025] The first flange and the second flange each include a second compression tab that is circumferentially arranged between the first rotation element and the first end of the third spring or the second end of the fourth spring, respectively.

[0026] When the first rotating element is capable of rotating in a positive direction from a stationary position, the first rotating element moves the first end of the third spring toward the second end of the third spring via the second compression protrusion of the first flange, and when the first rotating element is capable of rotating in a negative direction from a stationary position, the first rotating element moves the second end of the fourth spring toward the first end of the fourth spring via the second compression protrusion of the second flange.

[0027] Thus, the springs are arranged in pairs diametrically opposed.Thus, each flange is connected to one end of two diametrically opposed springs, for example a first and a third spring for the first flange and a second and a fourth spring for the second flange.

[0028] This configuration of the device allows the first and second compression tabs of the same flange to be subjected to two centrifugal forces from the spring mass under the influence of rotational speed. These two centrifugal forces are equal in magnitude and opposite in direction. In this way, the deformations associated with these two centrifugal forces compensate for each other, and radial forces no longer act on the first and / or second rotating elements, even when the rotation of the first rotating element changes from positive to negative, or vice versa. Consequently, the balance of centrifugal forces within the device eliminates friction and, therefore, the deterioration of filtering performance associated with friction. The device becomes insensitive to the adverse effects of centrifugal forces.

[0029] The first flange is movable in a positive direction between a predetermined initial position, where the first flange does not compress the first spring, and an end-of-travel position, where the first flange compresses the first spring. This movement constitutes the predetermined travel of the first flange. The second flange is movable in a negative direction between a predetermined initial position, where the second flange does not compress the second spring, and an end-of-travel position, where the second flange compresses the second spring. This movement constitutes the predetermined travel of the second flange.

[0030] The second rotating element includes a circumferential stop portion, or the first compression protrusion of the first flange and the second compression protrusion of the second flange each include a stop portion, and the stop portion or multiple stop portions are respectively designed to prevent the first flange from moving beyond a predetermined initial position in the negative direction and to prevent the second flange from moving beyond a predetermined initial position in the positive direction.

[0031] In this way, when the second rotating element comprises a stop, the stop ensures that the first and second flanges do not exceed their predetermined travel, in particular between their predetermined initial position and their end-of-travel position, by stopping the first and second flanges. The stop is an end-of-travel element.

[0032] The stopper is circumferentially located between the first compression tab of the first flange and the second compression tab of the second flange.

[0033] The second rotating element includes two stops. The first stop is designed to prevent the first compression tab of the first flange and the second compression tab of the second flange from exceeding their predetermined travels. The second stop is designed to prevent the second compression tab of the first flange and the first compression tab of the second flange from exceeding their predetermined travels. This improves control over the travels of the first and second flanges.

[0034] The stop is a stamped part made in the second rotary element. Like this, the stop is simple in design, cheap and compact.

[0035] When the first compression tab of the first flange and the second compression tab of the second flange each include a stop portion, the stop portion of the first compression tab of the first flange ensures that the first flange does not exceed its predetermined travel, particularly between its predetermined initial position and its end-of-travel position, by stopping the movement of the first flange in the negative direction, and the stop portion of the first compression tab of the second flange ensures that the second flange does not exceed its predetermined travel, particularly between its predetermined initial position and its end-of-travel position, by stopping the movement of the second flange in the positive direction. The stop portion is a travel end element.

[0036] The second compression tabs of the first and second flanges each include a stop. The stops of the first and second compression tabs of the first flange are designed to prevent the first flange from traveling beyond its predetermined travel. The stops of the first and second compression tabs of the second flange are designed to prevent the first flange from traveling beyond its predetermined travel. This improves control over the travel of the first and second flanges.

[0037] Each stop is a shoulder formed on the first lug of the first flange and the first lug of the second flange, respectively. Like this, the stop is simple in design, cheap and compact.

[0038] The first flange and / or the second flange comprises a single, one-piece balancing disc that is rotatable about the rotation axis and forms the first compression tab. In this way, the first flange and / or the second flange are made in one piece, thereby reducing manufacturing costs and facilitating installation of the device.

[0039] The first compression tab has an inclined U-shape. This shape is also known as a luggage corner. It includes a main wall and two side walls radially relative to the main wall. The inclined U-shape of the first compression tab is formed from a stamped component. This ensures a good connection with the spring.

[0040] The second compression tab has the same shape as the first compression tab.

[0041] The first and / or second flanges include a single balancing disc rotatable about an axis of rotation and an end piece fixed to the single balancing disc, forming a first compression tab. The single balancing disc is made of metal. The end piece is made of plastic and overmolded onto the single balancing disc. This allows the first and / or second flanges to be manufactured from a limited number of components, thereby limiting their price and allowing the various components to be tailored to their functions.

[0042] The first flange and / or the second flange comprises a second end piece which is fixed to the single dummy disc and forms a second compression tab.

[0043] The first flange and the second flange are axially located on either side of the first rotating element. In other words, the first rotating element is axially interposed between the first flange and the second flange. This optimizes the axial volume of the device.

[0044] The first flange and / or the second flange includes a first balancing disc, a second balancing disc rotating together with the first balancing disc, and an end piece forming a first compression tab.

[0045] The first dummy disc is riveted to the second dummy disc. This ensures that the connecting element, which secures the two dummy discs to each other, is strong and can be easily produced.

[0046] The first balancing disc and the second balancing disc are rotatable about a rotation axis.

[0047] The first balancing disc and the second balancing disc are identical, so only one reference is required, thereby reducing manufacturing costs.

[0048] The first balancing disk and / or the second balancing disk are punched metal sheets.

[0049] The first flange and / or the second flange includes a second stamped part forming a second compression tab. The second stamped part is identical to the first stamped part. In this way, only one reference is required, thereby reducing manufacturing costs.

[0050] The first balancing disc of the first flange and the first balancing disc of the second flange are axially located on one side of the first rotating element, and the second balancing disc of the first flange and the second balancing disc of the second flange are axially located on the other side of the first rotating element. In this way, the flange has excellent mechanical strength.

[0051] One of the first rotating element and the second rotating element is rotationally coupled to a hub, and the first flange and / or the second flange is guided in rotation by the hub.

[0052] The device further includes a friction system including a friction washer arranged to rub the first rotating element or the second rotating element in a positive direction or a negative direction and driven to rotate by the first or second flange.

[0053] The friction system thus makes it possible to differentiate between friction in a positive direction and friction in a negative direction.

[0054] The friction washer is arranged to rub the second rotating element in a positive or negative direction, and the friction system further comprises an actuating washer provided with axial fingers interacting with recesses in the friction washer, thereby ensuring that the friction washer is driven by the actuating washer when the second flange is rotatable.

[0055] Since this friction is particularly large in the negative direction, especially during the start-up process of hybrid vehicles, the friction system is particularly effective in the latter direction. The friction system has fewer parts and is more robust.

[0056] The friction system further comprises an axial support rotating together with the second rotary element and an elastic washer arranged between the axial support and the friction washer in order to exert an axial force on the friction washer in the direction of the second rotary element.

[0057] According to another aspect of the invention, a final subject of the invention is a vehicle propulsion unit comprising an internal combustion engine and / or an electric motor for propelling the vehicle and a torsional damping device according to the invention.

[0058] In the description and claims, when referring to a spring, the terms "compressed" or "compression" on the one hand, and the terms "prestressed" or "prestress" on the other hand, are used as follows:

[0059] - the prestressing of the spring means that the spring is installed in a housing that is smaller than the initial length of the spring, so that the elasticity of the spring causes it to exert a force on at least one wall of the housing;

[0060] -Compression of a spring refers to the compression of the spring by moving the two movable parts together.

[0061] Therefore, the prestressing of the spring is effective even when the torsion damping device is at rest and no torque is transmitted. The spring is compressed only during the transmission of torque; the parts that are movable relative to each other change the structure of the spring's receptacle and compress the spring.

[0062] “Vehicle” is understood to mean 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 makes it possible to move living beings and / or objects from one point to another. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Preferred exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which:

[0064] Figure 1 is an exploded view of a torsional damping device according to the present invention;

[0065] Figure 2 is a partial perspective view of the torsional damping device, with the first flange and the second flange in their predetermined initial positions;

[0066] Figure 3 is a partial perspective view of the torsional damping device, with the first flange in the end-of-travel position;

[0067] Figure 4 is a partial perspective view of the torsional damping device, with the second flange in the end-of-travel position;

[0068] Figure 5 is a partial cross-sectional view of a torsional damping device including a friction system;

[0069] Figure 6 is a partial perspective view of the torsional damping device, including a stop portion;

[0070] Figure 7 is a perspective view of a first variant embodiment of the flange;

[0071] Figure 8 is a perspective view of a second variant embodiment of the flange;

[0072] Figure 9 is a partial perspective view of a torsional damping device including a flange according to a third variant embodiment. DETAILED DESCRIPTION

[0073] Throughout the description and claims, the terms "external" and "inner," as well as the directions "axial" and "radial," will be used to refer to elements of the damping device, in accordance with the definitions given therein. The axis of rotation X defines the "axial" direction. The "radial" direction is orthogonal to the axis of rotation X. The "circumferential" direction is orthogonal to the axis of rotation X and to the radial directions. The terms "external" and "inner" are used to define the relative position of one component relative to another, with reference to the axis of rotation X; components closer to the axis are therefore described as inner, as opposed to outer components, which are radially located at the periphery. Furthermore, the angles and angular sectors indicated are defined relative to the axis of rotation X.

[0074] Figure 1 A torsional damping device 1 is shown.

[0075] The damping device 1 may comprise a peripheral torque transmitting member and a central torque transmitting member, which in this case is constituted by the hub 5 .

[0076] The peripheral torque transmission member may be a friction disc, for example a torque limiter (not shown) which, during normal operation, is intended to transmit torque by rotating about the axis of rotation X and to limit this transmission when this torque exceeds a certain value.

[0077] The peripheral torque transmitting member may be fixed, for example, by a first set of rivets, to the first rotating torque transmitting element, which in this case consists of a disc called “web” 7. The device 1 may comprise a web 7.

[0078] The hub 5 can be fixed to a second rotary torque transmission element by means of a second set of rivets 2, in this case consisting of a pair of circular discs 9, 10 referred to as "guide washers". The guide washers 9, 10 can form a cover of the device 1. A first guide washer 9 is fixed to a side of the hub 5, while a second guide washer 10 is fixed to the opposite side of the hub 5. The device 1 can include the guide washers 9, 10.

[0079] The roles of the web and the guide washer can be reversed, with the web becoming the second rotational element and the guide washer becoming the first rotational element.

[0080] The damping device 1 has an elastic damping device 11 interposed between the web 7 and the guide washers 9, 10. The elastic device 11 is designed so that the web 7 as one part and the guide washers 9, 10 as the other part can rotate relative to each other as the elastic device 11 is compressed.

[0081] The damping device 1 is intended for installation in a torque-transmitting drive train, for example, between an engine and a vehicle's wheels. A peripheral torque-transmitting member can be pressed against a bearing disk fastened to the engine's flywheel via a spring-loaded pressure plate. A hub 5 can be connected to a transmission shaft. Engine components rotate the peripheral torque-transmitting member, and thus the web 7 fastened thereto. The web 7 compresses the elastic device 11 via one of the first and second flanges 30, 40. The elastic device 11 transmits torque to the guide washers 9, 10, and thus to the hub 5 fastened thereto via the other of the first and second flanges 30, 40. By transmitting torque between the web 7 and the guide washers 9, 10, the elastic properties of the elastic device 11 filter out non-cyclic behavior and other undesirable torsional movements.

[0082] The device 1 can operate in dry environments or in the presence of grease or oil.

[0083] The damping device 1 further comprises a first end-of-travel stop and a complementary second end-of-travel stop which allow torque to be transmitted directly from the peripheral torque transmission member to the hub 5 , bypassing the elastic means 11 , beyond a predetermined angle of relative rotation between the web 7 and the guide washers 9 , 10 .

[0084] In this case, the first end-of-stroke stop is constituted by an external toothing arranged at the periphery of the hub 5 , whereas the complementary second end-of-stroke stop is constituted in this case by an internal toothing 4 situated in the centre of the web 7 .

[0085] The elastic damping device 11 comprises a first spring 13. The first spring 13 can be straight. As an alternative, the first spring 13 can be curved.

[0086] The elastic damping device 11 may further include a third spring 15. The third spring 15 may be straight. Alternatively, the third spring 15 may be curved. The first spring 13 may be radially opposite to the third spring 15 relative to the rotation axis X.

[0087] The first spring 13 extends between a first end 131 and a second end 132. The third spring 15 extends between a first end 151 and a second end 152.

[0088] The web 7 includes a first opening defining a first receiving portion 17. The first spring 13 can be mounted in the first receiving portion 17. The web 7 can also include a second opening defining a second receiving portion 18. The third spring 15 can be mounted in the second receiving portion 18.

[0089] Each receptacle 17 , 18 of the web 7 has a first support region 19 and an opposite second support region 20 .

[0090] The web 7 comprises two diametrically opposed arms 6. Each arm 6 can form a partition between a first housing 17 and a second housing 18. A spring 13, 15 is mounted between the arms 6.

[0091] The guide washers 9, 10 each have an opening 12 to allow the installation of a spring 13, 15. The edges of the opening are spaced apart from the springs 13, 15.

[0092] The function of the elastic means 11 may be provided by a single spring or by any number of springs, which may be connected in series or in parallel.

[0093] The web 7 is rotatable between a rest position, in which the springs 13 , 15 of the elastic device 11 are not compressed, and an active position, in which the springs 13 , 15 of the elastic device 11 are compressed.

[0094] The device 1 further comprises a first flange 30 and a second flange 40 .

[0095] The first flange 30 and the second flange 40 may be rotatable about the rotation axis X. The first flange 30 and the second flange 40 may be guided by the hub 5 . The first flange 30 and the second flange 40 may be axially mounted on either side of the web 7 .

[0096] The first flange 30 can be radially centered directly on the guide washers 9 , 10 or on the web 7 . As an alternative, the first flange 30 can be radially centered on the guide washers 9 , 10 or on the web 7 indirectly.

[0097] The second flange 40 can be radially centered directly on the guide washers 9 , 10 or on the web 7 . Alternatively, the second flange 40 can be radially centered on the guide washers 9 , 10 or on the web 7 indirectly.

[0098] The first flange 30 includes at least one balancing disc 31 , a first compression tab 32 , and a second compression tab 33 .

[0099] The balancing disc 31 may be a stamped metal sheet.

[0100] The first and second compression tabs 32, 33 may each include a bearing surface 34 designed to bear against one end of one of the springs 13, 15. The first and second compression tabs 32, 33 may each further include a protrusion 35 extending radially from the bearing surface 34 between an end secured to the bearing surface and a free end. The protrusion 35 may be a retaining element designed to radially retain one of the springs. The protrusion 35 may be designed to radially retain one of the springs when subjected to centrifugal forces. The protrusion 35 may also be designed to axially retain one of the springs 13, 15. The first and second compression tabs 32, 33 may each further include an outer edge 36 extending radially from the upper end of the bearing surface 34 between the end secured to the bearing surface and the free end. The edge 36 may be a retaining element designed to radially retain one of the springs. The edge 36 may be designed to radially retain one of the springs when subjected to centrifugal forces.

[0101] The first compression tab 32 of the first flange 30 can be circumferentially arranged between the first end 131 of the first spring 13 and the web 7. More specifically, when the device 1 is in a static state, the first compression tab 32 of the first flange 30 can bear against the first bearing area 19 of the first receiving portion 17 of the web 7. This static state of the device 1 is a state in which the web 7 is in a static position. The static position of the web 7 is a position in which the web 7 is spaced apart from the springs 13 and 15. In other words, the web 7 does not compress either spring 13 or 15. This static state of the device 1 is a state in which the first flange 30 is in a predetermined initial position. The bearing surface 34 of the first compression tab 32 of the first flange 30 can bear against the first end 131 of the first spring 13.

[0102] The second compression tab 33 of the first flange 30 can be circumferentially arranged between the first end 151 of the third spring 15 and the web 7. More specifically, when the device 1 is in a static state, the second compression tab 33 of the first flange 30 can bear against the first bearing area 19 of the second receiving portion 18 of the web 7. When the device 1 is in a static state, the first flange 30 is in a predetermined initial position, and the web 7 is in a static position. The bearing surface 34 of the second compression tab 33 of the first flange 30 can bear against the first end 151 of the third spring 15.

[0103] The balancing disc 31, which is rotatable about the rotation axis X, can be a single balancing disc. The balancing disc 31 can be a single piece. The balancing disc 31 can form a first compression tab 32 and a second compression tab 33. The first compression tab 32 and the second compression tab 33 can have an inclined U-shape. This shape is also known as a luggage case corner. This shape includes a main wall and two side walls radially relative to the main wall. One of the side walls can form an edge 36. The inclined U-shape of the first compression tab is formed from a stamped part.

[0104] The second flange 40 includes at least one balancing disc 41 , a first compression tab 42 , and a second compression tab 43 .

[0105] The balancing disc 41 may be a stamped metal plate.

[0106] The first compression tab 42 and the second compression tab 43 may each include a bearing surface 44 designed to abut one end of one of the springs 13 or 15. The first compression tab 42 and the second compression tab 43 may each further include a protrusion 45 extending radially from the bearing surface 44 between an end secured to the bearing surface and a free end. The protrusion 45 may be a retaining element designed to radially retain one of the springs. The protrusion 45 may be designed to radially retain one of the springs when subjected to centrifugal forces. The protrusion 45 may also be designed to axially retain one of the springs 13 or 15. The first compression tab 42 and the second compression tab 43 may each further include an outer edge 46 extending radially from the upper end of the bearing surface 44 between the end secured to the bearing surface and the free end. The edge 46 may be a retaining element designed to radially retain one of the springs. The edge 46 may be designed to radially retain one of the springs when subjected to centrifugal forces.

[0107] The first compression tab 42 of the first flange 40 can be circumferentially arranged between the second end 132 of the first spring 13 and the web 7. More specifically, when the device 1 is in a static state, the first compression tab 42 of the second flange 40 can bear against the second bearing area 20 of the first receiving portion 17 of the web 7. In this static state of the device 1, the second flange 40 is in a predetermined initial position, and the web 7 is in a static position. The bearing surface 44 of the first compression tab 42 of the second flange 40 can bear against the second end 132 of the first spring 14.

[0108] The second compression tab 43 of the second flange 40 can be circumferentially arranged between the second end 152 of the third spring 15 and the web 7. More specifically, when the device 1 is in a static state, the second compression tab 43 of the second flange 40 can bear against the second bearing area 20 of the second receiving portion 18 of the web 7. In this static state of the device 1, the second flange 40 is in a predetermined initial position, and the web 7 is in a static position. The bearing surface 44 of the second compression tab 43 of the second flange 40 can bear against the second end 122 of the third spring 15.

[0109] The angle of attack of one of the compression tabs on at least one of the springs 13, 14, 15, 16 is between 0° and 20° (degrees).

[0110] The balancing disc 41, which is rotatable about the rotation axis X, can be a single balancing disc. The balancing disc 41 can be a single piece. The balancing disc 41 can form a first compression tab 42 and a second compression tab 43. The first compression tab 42 and the second compression tab 43 can have an inclined U-shape. This shape is also known as a luggage case corner. This shape includes a main wall and two side walls radially relative to the main wall. One of the side walls can form an edge 46. The inclined U-shape of the first compression tab is formed from a stamped part.

[0111] In the axial direction, there is a first flange 30 , the web 7 and then a second flange 40 .

[0112] The elastic damping device 11 may further comprise a second spring 14 and a fourth spring 16. The springs 13, 14, 15, 16 may be arranged circumferentially. The springs 13, 14, 15, 16 may be arranged in series. The springs 14, 16 may be straight. Alternatively, the springs 14, 16 may be curved. The second spring 14 may be radially opposite to the fourth spring 16 relative to the rotation axis X.

[0113] The second spring 14 extends between a first end 141 and a second end 142. The fourth spring 16 extends between a first end 161 and a second end 162.

[0114] The first spring 13 and the second spring 14 can be mounted in a first housing 17 of the web 7. The third spring 15 and the fourth spring 16 can be mounted in a second housing 18 of the web 7. The springs 13, 14, 15, 16 are mounted between the arms 6 of the web 7.

[0115] The openings 12 in the guide washers 9, 10 enable the installation of springs 13, 14, 15, 16. The edges of the openings are spaced apart from the springs 13, 14, 15, 16.

[0116] The elastic damping device 11 further includes a phasing element 50 for phasing the springs 13, 14, 15, and 16. The phasing element 50 includes two spacers 51 mounted diametrically opposite each other between two phasing discs 52. The first spacer 51 can be mounted circumferentially between the first spring 13 and the second spring 14. The second spacer 51 can be mounted circumferentially between the third spring 15 and the fourth spring 16.

[0117] Each spacer 51 may include two end pieces 53. The two end pieces may be identical. The two end pieces may form a single-piece component. Each end piece 53 may be made of sintered steel. Each end piece 53 may include a bearing surface 54 designed to bear against one of the ends of the spring. Each end piece 53 may also include a stud 55 extending radially from the bearing surface 54, between the end secured to the bearing surface and the free end. The stud 55 may be a retaining element designed to radially retain one of the springs. The stud 55 may be designed to radially retain one of the springs when subjected to centrifugal forces. The stud 55 may also be designed to axially retain one of the springs 13, 14, 15, or 16. Each end piece 53 may also include an outer edge 56 extending radially from the upper end of the bearing surface 54, between the end secured to the bearing surface and the free end. The edge 56 may be a retaining element designed to radially retain one of the springs 13, 14, 15, or 16. The stud 56 may be designed to radially retain one of the springs 13 , 14 , 15 , 16 when the one of the springs 13 , 14 , 15 , 16 is subjected to centrifugal forces.

[0118] The first end portion 53 of the first spacer 51 may contact the second end 132 of the first spring 13, and the second end portion 53 of the first spacer may contact the first end 141 of the second spring 14. The first end portion 53 of the second spacer 51 may contact the second end 152 of the third spring 15, and the second end portion 53 of the second spacer may contact the first end 161 of the fourth spring 16.

[0119] The phase plate 52 and each end piece 53 may be secured together by rivets 57 .

[0120] The bearing surfaces 34 of the first compression tab 32 and the second compression tab 33 can each be designed to bear against one of the ends of one of the springs 13, 14, 15, 16. The stud 35 can be designed to axially retain one of the springs 13, 14, 15, 16. The edge 36 can be designed to radially retain one of the springs 13, 14, 15, 16.

[0121] The bearing surfaces 44 of the first compression tab 42 and the second compression tab 43 can each be designed to bear against one of the ends of one of the springs 13, 14, 15, 16. The stud 45 can be designed to axially retain one of the springs 13, 14, 15, 16. The edge 46 can be designed to radially retain one of the springs 13, 14, 15, 16.

[0122] When the elastic device 11 includes four springs 13, 14, 15, 16, the first compression tab 42 of the second flange 40 can be circumferentially arranged between the second end 142 of the second spring 14 and the web 7. More specifically, when the device 1 is in a static state, the first compression tab 42 of the second flange 40 can bear against the second bearing area 20 of the first receiving portion 17 of the web 7. In this static state of the device 1, the second flange 40 is in a predetermined initial position, and the web 7 is in a static position. The bearing surface 44 of the first compression tab 42 of the second flange 40 can bear against the second end 142 of the second spring 14.

[0123] The second compression tab 43 of the second flange 40 can be circumferentially arranged between the second end 162 of the fourth spring 16 and the web 7. More specifically, when the device 1 is in a static state, the second compression tab 43 of the second flange 40 can bear against the second bearing area 20 of the second receiving portion 18 of the web 7. In this static state of the device 1, the second flange 40 is in a predetermined initial position, and the web 7 is in a static position. The bearing surface 44 of the second compression tab 43 of the second flange 40 can bear against the second end 162 of the fourth spring 16.

[0124] The first flange 30 ′ of the second modified embodiment is different from the first flange 30 of the first modified embodiment in that:

[0125] The first flange 30' may also include two end pieces 37'. The two end pieces 37' are fastened to the single dummy disc 31'. The first end piece 37' may form the first compression tab 32. The second end piece 37' may form the second compression tab 33. The single dummy disc 31' may be made of metal. Each end piece 37' may be made of plastic and overmolded onto an arm of the single dummy disc 31'.

[0126] The features of this second variant also apply to the second flange.

[0127] The first flange 30 ″ of the third modified embodiment is different from the first flange 30 of the first modified embodiment in that:

[0128] The first flange 30″ can include two balancing discs 31″ and two end parts 37″. The first balancing disc can rotate together with the second balancing disc. The first balancing disc 31″ and the second balancing disc 31″ are strictly identical. The two end parts 37″ are fastened to the single balancing disc 31″. The first end part 37″ can form a first compression lug 32. The second end part 37″ can form a second compression lug 33. The second stamped part is identical to the first stamped part 37″. The two balancing discs 31″ can be made of stamped metal sheet. Each end part 37″ can be made of sintered steel. The first balancing disc is riveted to the second balancing disc. The stamped part 37″ can be riveted to the two balancing discs 31″.

[0129] The features of this third variant also apply to the second flange 40 ″.

[0130] The first balancing disc 31 ″ of the first flange 30 ″ and the first balancing disc 41 ″ of the second flange 40 ″ are axially located on one side of the web 7 , and the second balancing disc 31 ″ of the first flange 30 ″ and the second balancing disc 41 ″ of the second flange 40 ″ are axially located on the other side of the web 7 .

[0131] Damping device 1 may also include a friction system 60 for dissipating the energy of springs 13, 14, 15, and 16 and preventing oscillation. Friction system 60 includes an axial support 61 secured to second guide washer 10 via a third set of rivets 62. Disposed between axial support 61 and second guide washer 10 are a friction washer 63, an insert washer 64, and a spring washer 65, which applies a load to friction washer 63 via insert washer 64.

[0132] The axial support 61 can also be made in one piece with the guide washer 10 .

[0133] Furthermore, a second flange 40 is provided on the other side of the second guide washer 10. The second flange 40 may also include at least one toothing. The toothing is designed to actuate an additional friction washer, which includes axial fingers 49, preferably four axial fingers 49. The additional friction washer may be made of plastic. The additional friction washer can be mounted such that the four axial fingers 49 pass through four corresponding grooves 8 formed in the second guide washer 10. Each of the four axial fingers 49 is inserted into a recess 69 in the friction washer 63. Thus, the second flange 40 is rotatably coupled to the friction washer 69.

[0134] At least one of the guide washers 9, 10 may include a stop 21. The stop 21 is designed to prevent the first flange 30 from moving beyond a predetermined initial position in the negative direction and to prevent the second flange 40 from moving beyond a predetermined initial position in the positive direction. The stop 21 may be circumferentially located between the first compression tab 32 of the first flange 30 and the second compression tab 43 of the second flange 40.

[0135] The stop 21 can be a stamped part produced in at least one of the guide washers 9 , 10 .

[0136] At least one of the guide washers 9 , 10 can comprise two stops 21 .

[0137] Alternatively, the compression tabs 32, 33, 42, 43 of the first and second flanges may each include a stop 23. The stop 23 is designed to prevent the first flange 30 from moving beyond a predetermined initial position in the negative direction and to prevent the second flange 40 from moving beyond a predetermined initial position in the positive direction. More specifically, the stop 23 on the first flange 30 is designed to prevent the first flange 30 from moving beyond a predetermined initial position in the negative direction. The stop 23 on the second flange 40 is designed to prevent the second flange 40 from moving beyond a predetermined initial position in the positive direction.

[0138] Each stop 23 may be a shoulder formed on a compression tab of the flange, respectively.

[0139] The device 1 is installed in Figure 2 The Figure 2 The device 1 is shown in a rest state, that is, when it is not transmitting any torque, and the springs 13, 14, 15, 16 are unloaded. Each spring 13, 14, 15, 16 is mounted at one end in a compression tab 32, 33, 42, 43 and at the other end against one of the spacers 51. Each compression tab 32, 33, 42, 43 presses only against the web 7. In this way, the first pair of springs 13, 14 is mounted between the first compression tab 32 of the first flange 30, for example, pressing only against the first bearing area 19 of the first housing 17 of the web 7, and the first compression tab 42 of the second flange 40, for example, pressing only against the second bearing area 20 of the first housing 17 of the web 7. In addition, the second pair of springs 15 and 16 are installed between the second compression protrusion 33 of the first flange 30 and the second compression protrusion 43 of the second flange 40, and the second compression protrusion 33, for example, only presses against the first support area 19 of the second accommodating portion 18 of the web 7, and the second compression protrusion 43, for example, only presses against the second support area 20 of the second accommodating portion 18 of the web 7.

[0140] The springs 13, 14, 15, 16 are thus prestressed in pairs between a first bearing zone 19 and a second bearing zone 20. Between each pair of springs 13, 14, 15, 16, a spacer 51 rotatable about the axis X by means of a phasing disc 52 ensures the series connection of the pair of springs 13, 14, 15, 16 and the phasing, i.e. angular coordination, of one pair of springs with respect to the other pair.

[0141] The angular position of rest is the initial position from which the following are characterized:

[0142] a first torque polarity, defined by the fact that the web 7 is in an angular position relative to the guide washers 9 , 10 , which is situated in the angular sector between a predetermined initial position (also called rest angular position), in which the web 7 is in a rest position, and an end-of-travel position, in which the web 7 is in an active position, that is to say has been rotated as far as possible in the positive direction until the teeth 3 , 6 abut;

[0143] - A second torque polarity, defined by the fact that the web 7 is in an angular position relative to the guide washers 9, 10, which is located in the angular sector between a predetermined initial position (also called rest angular position), in which the web 7 is in a rest position, and an end-of-travel position, in which the web 7 is in an active position, that is to say has been rotated as far as possible in the positive direction until the teeth 3, 6 have come into abutment.

[0144] These two torque polarities correspond to two operating modes of the torsional damping device 1:

[0145] a mode of torque transmission from the central torque-transmitting element to the peripheral torque-transmitting elements, which corresponds, for example, in a vehicle, to the transmission of torque from the wheels to the engine (e.g., an engine braking phase), commonly referred to as "reverse mode"; this corresponds to the second torque polarity;

[0146] - a mode of torque transmission from peripheral torque transmission elements to central torque transmission elements, which corresponds, for example, in a vehicle, to the transmission of torque from the engine to the wheels (eg during acceleration), usually called "drive mode"; this corresponds to a first torque polarity.

[0147] Figure 3 Relating to disc 1 at first torque polarity. Figure 2 In the static angular position of the web 7, the web 7 has been rotated in the positive direction to its travel end position (arrow D). In this position, the springs 13, 14, 15, 16 are compressed between the compression tabs 42, 43 of the first bearing area 19 and the second flange 40 of the web 7.

[0148] Figure 4 Involving disc 1 at the second torque polarity. Figure 2 In the static angular position of the web 7, the web 7 has now been rotated in the negative direction to its travel end position (arrow I). In this position, the springs 13, 14, 15, 16 are compressed between the second bearing area 20 of the web 7 and the compression tabs 32, 33 of the first flange 30.

[0149] The operation of the friction device 60 differs depending on whether the torsional damping device 1 is operated in one or the other of these torque polarities.

[0150] When the torsional damping device 1 is under load according to the first polarity torque, this Figure 3 This corresponds to the movement of web 7 in the direction of arrow D, while guide washer 10 remains stationary. Web 7 then drives compression tabs 32, 33 of first flange 30 via first bearing area 19, compressing first and third springs 13, 15, respectively, against one of spacers 51. These spacers 51 compress second and fourth springs against the first and second compression tabs of second flange 40, respectively. Second bearing area 20 of web 7 then moves away from compression tabs 42, 43 of second flange 40. Friction system 60 is inactive. Since nothing is loading second flange 40, it does not move.

[0151] In contrast, when the torsional damping device 1 is loaded according to the second torque polarity, this corresponds to a movement of the web 7 in the direction of arrow I, with the guide washer 10 remaining stationary. The web 7 then drives the compression tabs 42, 43 of the second flange 40 via the second bearing area 20, compressing the second spring 14 and the fourth spring 16, respectively, against one of the spacers 51, which in turn compress the first and third springs against the first and second compression tabs of the first flange 30, respectively. The first bearing area 19 of the web 7 then moves away from the compression tabs 32, 33 of the first flange 30. The friction system 60 is active because the movement of the second flange 40 drives the movement of the friction washer 63, which therefore rubs against the guide washer 10 and the interposed washer 64.

[0152] According to the first torque polarity, the friction system 60 is therefore deactivated, whereas according to the second torque polarity it is activated.

[0153] Other variant embodiments of the torsional vibration damping device 1 may be implemented without departing from the scope of the present invention. For example, the system in which the torsional damping device is installed may be any system in a torque transmission train requiring torsional damping, such as a clutch disc.

Claims

1. A torsional damping device (1) for a vehicle transmission system, comprising: - a first rotary torque transmission element (7) provided with a first housing (17), - a second rotary torque transmitting element (9, 10), - elastic means (11) interposed between the first rotational torque transmission element (7) and the second rotational torque transmission element (9, 10) and allowing relative rotation of the first rotational torque transmission element (7) and the second rotational torque transmission element (9, 10) about the rotation axis (X) when the elastic means is deformed, the elastic means (11) comprising at least a first spring (13) mounted in the first housing (17), the first spring (13) comprising a first end (131) and an opposite second end (132), the first rotational torque transmission element (7) being movable between a rest position in which the springs of the elastic means are not compressed and an active position in which at least one spring of the elastic means is compressed, a first flange (30; 30'; 30") comprising a first compression tab (32) arranged circumferentially between the first end (131) of the first spring (13) and the first rotary torque transmitting element (7), a second flange (40; 40") comprising a first compression tab (42) arranged circumferentially between the second end (132) of the first spring (13) and the first rotary torque transmitting element (7), wherein, when the first rotational torque transmission element (7) is capable of rotating in a positive direction from the rest position, the first rotational torque transmission element (7) moves the first end (131) of the first spring (13) toward the second end of the first spring via the first compression tab of the first flange (30'; 30"); When the first rotational torque transmission element (7) is able to rotate in a negative direction from the static position, the first rotational torque transmission element (7) moves the second end (132) of the first spring (13) toward the first end of the first spring via the first compression tab of the second flange (40; 40").

2. The device (1) according to claim 1, characterized in that The first compression tab (32) of the first flange (30; 30'; 30") comprises at least one retaining element (35, 55, 36, 56) designed to radially retain the first spring (13).

3. The device (1) according to claim 1 or 2, characterized in that The elastic device (11) further comprises a second spring (14) mounted in the first receiving portion (17), the second spring (14) comprising a first end (141) and an opposite second end (142), wherein the first compression tab (42) of the second flange (40; 40") is circumferentially arranged between the second end (142) of the second spring (14) and the first rotary torque transmitting element (7), And when the first rotary torque transmission element (7) is able to rotate in a negative direction from a rest position, the first rotary torque transmission element (7) moves the second end (142) of the second spring (14) toward the first end of the second spring via the first compression tab of the second flange (40; 40").

4. The device (1) according to claim 3, characterized in that The first spring (13) and the second spring (14) are arranged in series via a phasing element (50) connecting the second end of the first spring (13) and the first end of the second spring (14).

5. The device (1) according to claim 3, characterized in that The first rotational torque transmission element (7) is provided with a second receiving portion (18), The elastic device (11) further comprises a third spring (15) radially opposite to the first spring (13) and a fourth spring (16) radially opposite to the second spring (14), the third spring and the fourth spring being mounted in the second accommodation portion (18), and each comprising a first end (151, 161) and an opposite second end (152, 162), wherein the first flange (30; 30'; 30") and the second flange (40; 40") each include a second compression tab (33, 43) that is circumferentially arranged between the first rotary torque transmitting element (7) and the first end (151) of the third spring (15) or the second end of the fourth spring (16), respectively, And wherein, when the first rotational torque transmission element (7) is capable of rotating in a positive direction from the static position, the first rotational torque transmission element (7) moves the first end (151) of the third spring (15) toward the second end of the third spring via the second compression protrusion of the first flange (30; 30'; 30"); and wherein, when the first rotational torque transmission element (7) is capable of rotating in a negative direction from the static position, the first rotational torque transmission element (7) moves the second end (162) of the fourth spring (16) toward the first end of the fourth spring via the second compression protrusion of the second flange (40; 40").

6. The device (1) according to claim 5, characterized in that The second rotational torque transmission element (9, 10) includes a circumferential stop portion (21), or the first compression lug (32) of the first flange (30; 30'; 30") and the second compression lug (43) of the second flange (40; 40") each include a stop portion (23), and the circumferential stop portion of the second rotational torque transmission element or the stop portions of the first compression lug and the second compression lug are respectively designed to prevent the first flange (30; 30'; 30") from moving in the negative direction beyond a predetermined initial position and to prevent the second flange (40; 40") from moving in the positive direction beyond a predetermined initial position.

7. The device (1) according to claim 1 or 2, characterized in that The first flange (30; 30') and / or the second flange (40) comprises a single, one-piece balancing disc (31, 41) which is rotatable about an axis of rotation (X) and forms the first compression tab, Alternatively, the invention comprises a single balancing disc (31') rotatable about the rotation axis (X) and an end piece (37') fastened to the single balancing disc (31'), thereby forming the first compression lug (32, 42).

8. The device (1) according to claim 1 or 2, characterized in that The first flange (30; 30'; 30") and the second flange (40; 40") are axially located on either side of the first rotary torque transmission element (7).

9. The device (1) according to claim 1 or 2, characterized in that The first flange (30") and / or the second flange (40") comprises a first balancing disc, a second balancing disc (31", 41") rotating together with the first balancing disc, and an end piece (37"), thereby forming the first compression lug (32, 42).

10. The device (1) according to claim 9, characterized in that The first balancing disc (30") of the first flange and the first balancing disc (40") of the second flange are axially located on one side of the first rotational torque transmission element (7), and the second balancing disc (30") of the first flange and the second balancing disc (40") of the second flange are axially located on the other side of the first rotational torque transmission element (7).

11. The device (1) according to claim 1 or 2, characterized in that One of the first rotational torque transmission element (7) and the second rotational torque transmission element (9, 10) is rotationally coupled to a hub (5), and the first flange and / or the second flange is rotationally guided by the hub.

12. The device (1) according to claim 1 or 2, characterized in that The device further comprises a friction system (60) comprising a friction washer (63) arranged to rub the first rotating torque transmission element or the second rotating torque transmission element in a positive direction or a negative direction and driven in rotation by the first flange or the second flange.

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