Dual mass flywheel, transmission system and vehicle

Abstract

The present disclosure relates to a dual mass flywheel comprising a primary flywheel arranged about a rotational axis, a secondary flywheel arranged about the rotational axis and being rotatable relative to the primary flywheel, a main cover plate fastened to the primary flywheel, the secondary flywheel being arranged between the primary flywheel and the main cover plate in an axial direction, an elastic cover plate fastened to the secondary flywheel, extending towards the main cover plate at an angle to a radial direction and elastically biasing the main cover plate in the axial direction. The elastic cover plate comprises an anti-inversion portion for preventing an inversion of an extension angle of the elastic cover plate relative to the radial direction. The present disclosure further relates to a driveline comprising such a dual mass flywheel and a vehicle comprising such a driveline.

Description

Technical Field

[0001] This disclosure relates to a dual-mass flywheel. This disclosure also relates to a transmission system and vehicle including such a dual-mass flywheel. Background Technology

[0002] The torque generated by a vehicle engine is typically not constant. This inconsistent torque can be transmitted to the transmission gearbox, causing vibrations and resulting in particularly undesirable noise or impacts. To reduce the adverse effects of vibration and improve driving comfort, it is known to equip the torque transmission system of a vehicle's drivetrain with torsional damping devices. Torsional damping devices can absorb and mitigate vibrations generated by the vehicle engine.

[0003] One known torsional vibration damping device is a dual-mass flywheel, which has two flywheels capable of rotating relative to each other about an axis of rotation and a spring disposed between the two flywheels. When the torque and / or speed generated by the engine fluctuates, the relative rotation between the two flywheels causes the spring to compress or extend, thereby absorbing and mitigating vibrations generated by the vehicle engine. The dual-mass flywheel also includes a resilient cover plate that extends outward at an angle to the radial direction and has an overall disc shape. The resilient cover plate biases the two flywheels of the dual-mass flywheel together in the axial direction, forming the integral structure of the dual-mass flywheel.

[0004] However, the extension angle of the elastic cover plate in a dual-mass flywheel is usually small relative to the radial direction. When there are large bumps and vibrations during the transportation and handling of the product, the extension angle of the elastic cover plate may flip over, and it will not be able to play the role of pressing the two flywheels together in the axial direction. Summary of the Invention

[0005] Therefore, this disclosure aims to solve the aforementioned problems existing in conventional dual-mass flywheels, and its purpose is to provide a dual-mass flywheel with an anti-overturning elastic cover that can reduce the product defect rate caused by transportation and handling processes.

[0006] The objective is achieved by a dual-mass flywheel according to an embodiment of the present disclosure. The dual-mass flywheel includes: a primary flywheel arranged about a rotation axis; a secondary flywheel arranged about the rotation axis and rotatable relative to the primary flywheel; a main cover plate fastened to the primary flywheel, wherein the secondary flywheel is arranged axially between the primary flywheel and the main cover plate; and a resilient cover plate fastened to the secondary flywheel, extending at an angle to the radial direction toward the main cover plate, and resiliently biasing the main cover plate axially. The resilient cover plate includes an anti-overturning portion for preventing the resilient cover plate from overturning relative to the radial extension angle.

[0007] One objective of this disclosure is to provide a dual-mass flywheel with an anti-overturning elastic cover, reducing product defect rates during transportation and handling. According to this disclosure, the dual-mass flywheel has an elastic cover fastened to a secondary flywheel, extending toward and biased against a primary cover fastened to a primary flywheel. The extension direction of the elastic cover is angled relative to the radial direction, thus having an axial component, capable of elastically biasing the primary cover in the axial direction, providing a reaction force that axially biases the secondary flywheel toward the primary flywheel. The elastic cover is provided with an anti-overturning portion, preventing the extension angle relative to the radial direction from overturning, ensuring that the axial component of the extension direction of the elastic cover always faces the primary cover and does not become away from it due to overturning. This ensures that the elastic cover is always biased against the primary cover, thereby relying on the reaction force of the primary cover to axially bias the secondary flywheel toward the primary flywheel, maintaining the integrity of the dual-mass flywheel.

[0008] The dual-mass flywheel according to this disclosure may also have one or more of the following features, individually or in combination.

[0009] According to an optional embodiment of this disclosure, the resilient cover includes a central portion and an outer extension, the central portion being fastened to the secondary flywheel, the outer extension extending at an angle to the radial direction toward the main cover, and the radially outer edge of the outer extension resiliently biasing the main cover.

[0010] According to an optional embodiment of this disclosure, the resilient cover further includes an intermediate portion disposed between the central portion and the outer extension, the intermediate portion and the outer extension being connected to each other via a first bend.

[0011] According to an optional embodiment of this disclosure, the anti-overturning portion is composed of a structural reinforcement portion disposed on the elastic cover plate, at least a portion of which is disposed on the first bending portion.

[0012] According to an optional embodiment of this disclosure, the structural reinforcement is a stamped reinforcing rib.

[0013] According to an optional embodiment of this disclosure, the resilient cover further includes a tab extending from the radial outer edge of the outer extension toward the secondary flywheel and capable of abutting against the secondary flywheel as the resilient cover deforms, the tab constituting the anti-overturning portion.

[0014] According to an optional embodiment of this disclosure, the secondary flywheel is provided with a guide hole; the tab includes a base connected to the radial outer edge and teeth extending from the base into the guide hole, wherein the base is sized to be unable to be inserted into the guide hole.

[0015] According to an optional embodiment of this disclosure, the central portion and the outer extension are directly connected by a second bend, and the anti-overturning portion is composed of a structural reinforcement disposed on the elastic cover plate, at least a portion of which is disposed on the second bend.

[0016] According to an optional embodiment of this disclosure, the dual-mass flywheel further includes a first spacer axially arranged between the primary flywheel and the secondary flywheel and spaced apart from the primary flywheel and the secondary flywheel.

[0017] According to an optional embodiment of this disclosure, the dual-mass flywheel further includes a second spacer axially arranged between the resilient cover plate and the main cover plate, the resilient cover plate being resiliently biased against the main cover plate via the second spacer.

[0018] According to an optional embodiment of this disclosure, the outer extension is inclined relative to the radial direction at a first angle, and the middle portion is inclined relative to the radial direction at a second angle, the second angle being greater than the first angle.

[0019] According to an optional embodiment of this disclosure, the outer extension is tilted at an angle between 5° and 10° relative to the radial direction.

[0020] According to an optional embodiment of this disclosure, the dual-mass flywheel further includes one or more oscillation damping components mounted to the secondary flywheel, the anti-overturning portion being arranged to be offset from the oscillation damping components in the circumferential direction.

[0021] This disclosure also relates to a transmission system comprising a dual-mass flywheel as described above.

[0022] This disclosure also relates to a vehicle that includes the transmission system described above. Attached Figure Description

[0023] The above and other features and advantages of this disclosure will become more apparent from the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way. The following drawings are not intentionally drawn to scale with actual dimensions; their focus is on illustrating the gist of this disclosure.

[0024] Figure 1 A dual-mass flywheel according to an embodiment of the present disclosure is shown;

[0025] Figure 2 yes Figure 1 The internal view of the dual-mass flywheel after removing the main cover and the elastic cover is shown.

[0026] Figure 3This is a cross-sectional view of a dual-mass flywheel, the elastic cover of which includes an anti-rollover portion according to a first embodiment of the present disclosure;

[0027] Figure 4 Detailed illustration Figure 3 The flexible cover plate in the middle;

[0028] Figure 5 It is a cross-sectional view of a dual-mass flywheel, the elastic cover of which includes an anti-rollover portion according to a second embodiment of the present disclosure;

[0029] Figure 6 Detailed illustration Figure 5 The flexible cover plate in the middle;

[0030] Figure 7 The flipping of the resilient cover is illustrated schematically.

[0031] In each figure, identical or similar parts are represented by the same reference numerals. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure.

[0033] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” or “the,” and similar words used in this patent application specification and claims do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or similar words mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “first,” “second,” and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. “Upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships with reference to the accompanying drawings; these relative positional relationships may change accordingly when the absolute position of the described object changes. The terms “axial” and “axial direction” refer to the direction of extension of the rotation axis X of the dual-mass flywheel; the terms “radial” and “radial direction” are directions orthogonal to the rotation axis X; and the terms “circumferential” and “circumferential direction” are circumferential directions about the rotation axis X.

[0034] Various embodiments according to this disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions of them will be omitted. It should be understood that, for clarity, the dual-mass flywheel shown in the drawings may omit one or more components irrelevant to understanding the technical solutions of this disclosure.

[0035] Figure 1 The assembled dual-mass flywheel 100 is shown. Figure 2 exist Figure 1 The main cover and elastic cover have been removed to show the internal structure of the dual-mass flywheel 100.

[0036] The dual-mass flywheel 100 includes a primary flywheel 1 and a secondary flywheel 2, both arranged around a rotation axis X. The secondary flywheel 2 is rotatable relative to the primary flywheel 1. The primary flywheel 1 and the secondary flywheel 2 can be connected to an engine and a gearbox, respectively, serving as the input and output sides of the dual-mass flywheel 100. (Reference) Figure 2 Two springs 8 are positioned between the primary flywheel 1 and the secondary flywheel 2. The springs 8 are, for example, arc-shaped helical compression springs, and are able to interact with both the primary flywheel 1 and the secondary flywheel 2, thereby suppressing fluctuations in the torque transmitted between the primary flywheel 1 and the secondary flywheel 2. The dual-mass flywheel 100 also includes a oscillating damping assembly 10 mounted on the secondary flywheel 2, which has an internal oscillating block capable of oscillating relative to the secondary flywheel 2 within a certain range around the rotation axis X, thereby absorbing and mitigating torque fluctuations through inertia.

[0037] The dual-mass flywheel 100 maintains its assembled structure through the main cover plate 3 and the elastic cover plate 4. The main cover plate 3 is fastened to the primary flywheel 1, and the elastic cover plate 4 is fastened to the secondary flywheel 2.

[0038] refer to Figure 3 and Figure 5 As shown in the cross-sectional view, the main cover plate 3 can be welded to the upwardly rotating radial outer edge of the primary flywheel 1, and is generally located axially above the secondary flywheel 2. That is, the main cover plate 3 and the primary flywheel 1 are located on opposite axial sides of the secondary flywheel 2. It should be understood that other methods of fastening the main cover plate 3 to the primary flywheel 1 are also conceivable.

[0039] refer to Figure 4 and Figure 6 The resilient cover 4 includes a central portion 41, an outer extension 42, and an intermediate portion 43 disposed between the central portion 41 and the outer extension 42. The resilient cover 4 is fastened to the secondary flywheel 2 via the central portion 41. Figure 5 and Figure 6In the illustrated embodiment, the central portion 41 of the resilient cover plate 4 is tightly clamped and fixed between the secondary flywheel 2 and the spline portion riveted to the secondary flywheel 2. It should be understood that other fastening methods between the resilient cover plate 4 and the secondary flywheel 2 are also conceivable. The central portion 43 of the resilient cover plate 4 extends axially upward and radially outward from the central portion 41, i.e., at an angle to the radial direction towards the main cover plate 3. The outer extension portion 42 of the resilient cover plate 4 extends axially upward and radially outward from the central portion 43, i.e., at an angle to the radial direction towards the main cover plate 3. The radially outer edge of the outer extension portion 42 is elastically biased against the main cover plate 3. Since the extension direction of the outer extension portion 42 is at an angle to the radial direction, its biasing force on the main cover plate 3 is axial or at least has an axial component. The reaction force of the main cover plate 3 acts on the resilient cover plate 4, thereby axially biasing the secondary flywheel 2 towards the primary flywheel 1, thus holding the two together axially.

[0040] The dual-mass flywheel 100 includes a first spacer 6 axially arranged between a primary flywheel 1 and a secondary flywheel 2. This first spacer 6 separates the primary flywheel 1 and the secondary flywheel 2, reducing friction between them by preventing direct contact and thus avoiding impeded relative rotation. Specifically, the first spacer 6 is made of plastic, while the primary flywheel 1 and the secondary flywheel 2 are made of metal. The metal-plastic friction coefficient between the primary flywheel 1 and the secondary flywheel 2 and the first spacer 6 is much smaller than the metal-metal friction coefficient, further reducing friction between the primary flywheel 1 and the secondary flywheel 2. Furthermore, the first spacer 6 also serves to coaxially arrange the primary flywheel 1 and the secondary flywheel 2.

[0041] The dual-mass flywheel 100 also includes a second spacer 7 axially arranged between the resilient cover plate 4 and the main cover plate 3. This second spacer 7 separates the resilient cover plate 4 from the main cover plate 3, with the resilient cover plate first biased against the second spacer 7, which in turn biases the main cover plate 3. Specifically, the second spacer 7 is made of plastic, while the resilient cover plate 4 and the main cover plate 3 are made of metal. Therefore, the second spacer 7 replaces the metal-metal friction between the resilient cover plate 4 and the main cover plate 3 with metal-plastic friction, reducing friction.

[0042] The outer extension 42 of the elastic cover plate 4 is inclined at a first angle relative to the radial direction, which is smaller than the second angle of the middle portion 43 relative to the radial direction. The large inclination angle of the middle portion 43 causes the elastic cover plate 4 to extend rapidly upward radially inward, avoiding interference with the oscillating damping assembly 10. The elastic cover plate 4 transitions from the middle portion 43 to the outer extension 42 via a first bend 44. Optionally, the angle of inclination of the outer extension 42 relative to the radial direction is between 5° and 10°. Preferably, the angle of inclination of the outer extension 42 relative to the radial direction is 8°.

[0043] The secondary flywheel 2 is not locked to the primary flywheel 1 in the axial direction, but can float axially to a certain extent, thereby buffering the axial vibration borne by the dual-mass flywheel 100. When the secondary flywheel 2 is subjected to axial force and moves away from the primary flywheel 1, the angle of inclination of the outer extension 42 of the elastic cover plate 4 relative to the radial direction decreases. The deformation of the elastic cover plate 4 generates an elastic force that counteracts the axial force on the secondary flywheel 2, absorbing and buffering the axial vibration of the secondary flywheel 2. When the elastic cover plate 4 returns to its initial state, the angle of inclination of the outer extension 42 relative to the radial direction increases again, and the secondary flywheel 2 is also biased back to its initial axial position.

[0044] During the transportation and handling of the dual-mass flywheel 100, the axial vibration it may experience is much greater than the axial vibration it experiences during operation. The strength of the resilient cover 4 is designed for the working environment of the dual-mass flywheel 100 and is insufficient to resist the axial vibration of the dual-mass flywheel 100 during transportation and handling. In extreme cases, the extension angle of the resilient cover 4 relative to the radial direction may flip. Figure 7 A schematic diagram of this flipping is shown. As shown, under normal conditions, the outer extension 42 of the elastic cover 4 is inclined upwards, that is, it extends axially toward the main cover 3. When the extension angle of the elastic cover 4 relative to the radial direction flips, the outer extension 42 flips to be inclined downwards, that is, it extends axially away from the main cover 3, as... Figure 7 As shown by the dotted line. In this way, the flipped elastic cover plate 4 can no longer bias the main cover plate 3 through the outer extension 42, and can no longer provide the biasing force to keep the secondary flywheel 2 and the primary flywheel 1 together in the axial direction.

[0045] Therefore, the dual-mass flywheel 100 according to this disclosure prevents the elastic cover plate 4 from overturning relative to the radial direction by providing an anti-overturning part 5 on the elastic cover plate 4. Figure 3 and Figure 4 A first embodiment of the anti-rollover part 5 is shown. Figure 5 and Figure 6 A second embodiment of the anti-flipping part 5 is shown.

[0046] refer to Figure 3 and Figure 4 In the first embodiment, the anti-overturning portion 5 is composed of a structural reinforcement portion 45 disposed on the elastic cover plate 4. The structural reinforcement portion 45 extends from the first bend 44 connecting the outer extension portion 42 and the intermediate portion 43 to the outer extension portion 42. The structural reinforcement portion 45 strengthens the first bend 44, making it less prone to significant bending and preventing the outer extension portion 42 from overturning from an upward tilt to a downward tilt. Figure 4 In the embodiment shown, the structural reinforcement 45 is a stamped reinforcing rib. Figure 4The resilient cover plate 4 is shown to have three reinforcing ribs evenly arranged circumferentially. It is understood that the number of reinforcing ribs can be different.

[0047] refer to Figure 5 and Figure 6 In the second embodiment, the anti-overturning part 5 is composed of a tab 46 arranged on the elastic cover plate 4. The tab 46 extends from the radial outer edge of the outer extension 42 toward the secondary flywheel 2. When the elastic cover plate 4 deforms to the extent that the radial outer edge of the outer extension 42 moves downward excessively, the tab 46 abuts against the secondary flywheel 2, preventing further deformation of the elastic cover plate 4, thereby preventing the elastic cover plate 4 from overturning. In the preferred embodiment shown in the figures, the secondary flywheel 2 is provided with a guide hole 21, and the tab 46 includes a base 46a connected to the radial outer edge and a tooth 46b extending from the base 46a and inserted into the guide hole 21. The size of the base 46a is set to be larger than the size of the guide hole 21, so that it cannot be inserted into the guide hole 21. The guide hole 21 can guide the downward movement of the tooth 46b, while the base 46a can abut against the secondary flywheel 2, preventing further deformation of the elastic cover plate 4 and preventing the elastic cover plate 4 from overturning. The tabs 46 may also be formed by stamping, and the resilient cover plate 4 has a plurality of tabs 46 arranged circumferentially evenly, for example, two or more.

[0048] In the first and second embodiments of the anti-overturning part 5, the anti-overturning part 5 is offset from the swing damping assembly 10 in the circumferential direction to avoid interfering with the swing damping assembly 10. For this purpose, the elastic cover plate 4 also includes a positioning protrusion 47 provided on the central part 41 to perform angular positioning of the elastic cover plate 4 (and the anti-overturning part 5 provided thereon) during assembly.

[0049] According to another aspect of this disclosure, a transmission system is proposed, which includes a dual-mass flywheel 100 as described above.

[0050] According to another aspect of this disclosure, a vehicle is proposed that includes the transmission system as described above.

[0051] Certain features, structures, or characteristics in one or more embodiments of this disclosure may be appropriately combined.

[0052] Certain features, structures, or characteristics in one or more embodiments of this disclosure may be appropriately combined.

[0053] The foregoing description is illustrative of the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the foregoing description is illustrative of the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of this disclosure.

Claims

1. A dual-mass flywheel (100), characterized in that, The dual-mass flywheel (100) includes: A primary flywheel (1) is arranged around the axis of rotation (X); A secondary flywheel (2) arranged around the axis of rotation (X) and capable of rotating relative to the primary flywheel (1); The main cover plate (3) is fastened to the primary flywheel (1), wherein the secondary flywheel (2) is arranged in the axial direction between the primary flywheel (1) and the main cover plate (3); An elastic cover plate (4) is fastened to the secondary flywheel (2), extends at an angle to the radial direction toward the main cover plate (3), and elastically biases the main cover plate (3) in the axial direction. The elastic cover (4) includes an anti-overturning part (5) to prevent the elastic cover (4) from overturning relative to the radial extension angle.

2. The dual-mass flywheel (100) according to claim 1, characterized in that, The elastic cover plate (4) includes a central portion (41) and an outer extension (42). The central portion (41) is fastened to the secondary flywheel (2). The outer extension (42) extends toward the main cover plate (3) at an angle to the radial direction, and the radial outer edge of the outer extension (42) elastically biases the main cover plate (3).

3. The dual-mass flywheel (100) according to claim 2, characterized in that, The elastic cover plate (4) further includes an intermediate portion (43) disposed between the central portion (41) and the outer extension portion (42), the intermediate portion (43) and the outer extension portion (42) being connected to each other by a first bend portion (44).

4. The dual-mass flywheel (100) according to claim 3, characterized in that, The anti-overturning part (5) is composed of a structural reinforcement part (45) arranged on the elastic cover plate (4), at least a portion of which is arranged on the first bending part (44).

5. The dual-mass flywheel (100) according to claim 4, characterized in that, The structural reinforcement (45) is a reinforcing rib formed by stamping.

6. The dual-mass flywheel (100) according to claim 2 or 3, characterized in that, The elastic cover plate (4) further includes a tab (46) extending from the radial outer edge of the outer extension (42) toward the secondary flywheel (2) and capable of abutting against the secondary flywheel (2) when the elastic cover plate (4) is deformed, the tab (46) constituting the anti-overturning part (5).

7. The dual-mass flywheel (100) according to claim 6, characterized in that, The secondary flywheel (2) is provided with guide holes (21); The tab (46) includes a base (46a) connected to the radial outer edge and a tooth (46b) extending from the base (46a) into the guide hole (21), wherein the base (46a) is sized to be unable to be inserted into the guide hole (21).

8. The dual-mass flywheel (100) according to claim 2, characterized in that, The central portion (41) and the outer extension portion (42) are directly connected by a second bend, and The anti-overturning part (5) is composed of a structural reinforcement part (45) arranged on the elastic cover plate (4), and at least a portion of the structural reinforcement part (45) is arranged on the second bending part.

9. The dual-mass flywheel (100) according to any one of claims 1 to 6, characterized in that, The dual-mass flywheel (100) further includes a first spacer (6) which is axially arranged between the primary flywheel (1) and the secondary flywheel (2) and separates the primary flywheel (1) and the secondary flywheel (2).

10. The dual-mass flywheel (100) according to any one of claims 1 to 6, characterized in that, The dual-mass flywheel (100) further includes a second spacer (7) axially arranged between the elastic cover plate (4) and the main cover plate (3), wherein the elastic cover plate (4) elastically biases the main cover plate (3) through the second spacer (7).

11. The dual-mass flywheel (100) according to any one of claims 3 to 6, characterized in that, The outer extension (42) is inclined relative to the radial direction at a first angle, and the middle part (43) is inclined relative to the radial direction at a second angle, the second angle being greater than the first angle.

12. The dual-mass flywheel (100) according to any one of claims 1 to 6, characterized in that, The angle at which the outer extension (42) is tilted relative to the radial direction is between 5° and 10°.

13. The dual-mass flywheel (100) according to any one of claims 1 to 6, characterized in that, The dual-mass flywheel (100) also includes one or more oscillation damping components (10) mounted to the secondary flywheel (2), and the anti-overturning portion (5) is arranged to be offset from the oscillation damping components (10) in the circumferential direction.

14. A transmission system, characterized in that, The transmission system includes a dual-mass flywheel (100) according to any one of claims 1 to 13.

15. A vehicle, characterized in that, The vehicle includes the transmission system according to claim 14.

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