Dual mass flywheel, transmission system and vehicle

Abstract

The present disclosure relates to a dual mass flywheel comprising: a primary flywheel arranged about an axis of rotation; a secondary flywheel arranged about the axis of rotation and 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 the axial direction; a resilient cover plate is secured to the secondary flywheel, extends toward the primary cover plate at an angle to the radial direction, and resiliently biases the primary cover plate in the axial direction. The elastic cover plate comprises an anti-overturning part which is used for preventing the elastic cover plate from overturning relative to the extension angle in the radial direction. The present disclosure also relates to a drivetrain comprising such a dual mass flywheel and a vehicle comprising such a drivetrain.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a dual mass flywheel. The present disclosure also relates to a transmission system and a vehicle comprising such a dual mass flywheel. BACKGROUND

[0002] The torque generated by a vehicle engine is usually not constant. This non-constant torque can be transmitted into a transmission gearbox, causing vibrations of the transmission gearbox and thus generating, among others, particularly undesirable noises or impacts. In order to reduce the adverse effects of the vibrations and to improve the driving comfort of the vehicle, it is known to equip the torque transmission device of the vehicle driveline with a torsional damping device. The torsional damping device can allow the absorption and mitigation of the vibrations generated by the vehicle engine.

[0003] A known torsional damping device is a dual mass flywheel having two flywheels capable of relative rotation about a rotation axis and a spring arranged between the two flywheels. When the torque and / or the rotational speed generated by the engine fluctuates, a relative rotation occurs between the two flywheels and the spring is compressed or extended, thereby absorbing and mitigating the vibrations generated by the vehicle engine. The dual mass flywheel further comprises a resilient cover plate extending outwardly at an angle to the radial direction, having a generally disc-shaped shape. The resilient cover plate biases the two flywheels of the dual mass flywheel together in the axial direction, forming the overall configuration of the dual mass flywheel.

[0004] However, the angle of extension of the resilient cover plate with respect to the radial direction in the dual mass flywheel is usually small, and when the product is subjected to a large jolt or vibration during transportation and handling, the angle of extension of the resilient cover plate can be turned over, failing to bias the two flywheels together in the axial direction. SUMMARY

[0005] Therefore, the present disclosure aims to solve the above-mentioned problems existing in the conventional dual mass flywheel, and the purpose is to provide a dual mass flywheel having an anti-overturning resilient cover plate, which can reduce the product failure rate caused by transportation and handling.

[0006] The object is achieved by a dual mass flywheel according to one embodiment of the present disclosure. The dual mass flywheel comprises: a primary flywheel arranged about a rotation axis; a secondary flywheel arranged about the rotation axis and capable of rotation relative to the primary flywheel; a main cover plate fastened to the primary flywheel, wherein the secondary flywheel is arranged between the primary flywheel and the main cover plate in the axial direction; a resilient cover plate fastened to the secondary flywheel, extending toward the main cover plate at an angle to the radial direction, and elastically biasing the main cover plate in the axial direction. The resilient cover plate comprises an anti-overturning portion for preventing the angle of extension of the resilient cover plate with respect to the radial direction from turning over.

[0007] One of the objects of the present disclosure is to provide a dual mass flywheel having an anti-inversion elastic cover plate, which reduces the product defect rate caused by the transportation and handling process. The dual mass flywheel according to the present disclosure has an elastic cover plate fastened to a secondary flywheel, which extends toward and is biased against a primary cover plate fastened to a primary flywheel. The extension direction of the elastic cover plate is angled with respect to the radial direction, thereby having an axial component, and the elastic cover plate is able to elastically bias the primary cover plate in the axial direction, thereby providing a reaction force that axially biases the secondary flywheel toward the primary flywheel. An anti-inversion portion is provided on the elastic cover plate, which prevents the elastic cover plate from inverting the extension angle with respect to the radial direction, such that the axial component of the extension direction of the elastic cover plate is always directed toward the primary cover plate, and does not become directed away from the primary cover plate due to inversion. This ensures that the elastic cover plate is always able to be biased against the primary cover plate, thereby axially biasing the secondary flywheel toward the primary flywheel by the reaction force of the primary cover plate, and maintaining the integrity of the dual mass flywheel.

[0008] The dual mass flywheel according to the present disclosure can further have one or more of the following features, alone or in combination.

[0009] According to one optional embodiment of the present disclosure, the elastic cover plate includes a central portion fastened to the secondary flywheel, and an outer extension portion extending toward the primary cover plate at an angle with respect to the radial direction, and a radially outer edge portion of the outer extension portion elastically biases the primary cover plate.

[0010] According to one optional embodiment of the present disclosure, the elastic cover plate further includes an intermediate portion disposed between the central portion and the outer extension portion, and the intermediate portion and the outer extension portion are connected to each other by a first bent portion.

[0011] According to one optional embodiment of the present disclosure, the anti-inversion portion is constituted by a structural reinforcement portion disposed on the elastic cover plate, and at least a portion of the structural reinforcement portion is disposed on the first bent portion.

[0012] According to one optional embodiment of the present disclosure, the structural reinforcement portion is a press-formed reinforcement rib.

[0013] According to one optional embodiment of the present disclosure, the elastic cover plate further includes a tab extending from a radially outer edge of the outer extension portion toward the secondary flywheel and able to abut against the secondary flywheel as the elastic cover plate deforms, and the tab constitutes the anti-inversion portion.

[0014] According to one optional embodiment of the present disclosure, a guide hole is disposed on the secondary flywheel; the tab includes a base portion connected to the radially outer edge and a tooth portion extending from the base portion and inserted into the guide hole, and the base portion is sized so as not to be inserted into the guide hole.

[0015] According to one optional embodiment of the present disclosure, the central portion and the outer extension portion are directly connected by a second bending portion, and the anti-rollover portion is formed by a structural reinforcement portion arranged on the elastic cover plate, at least a portion of the structural reinforcement portion being arranged on the second bending portion.

[0016] According to one optional embodiment of the present disclosure, the dual-mass flywheel further comprises a first spacer axially arranged between the primary flywheel and the secondary flywheel and spacing the primary flywheel from the secondary flywheel.

[0017] According to one optional embodiment of the present disclosure, the dual-mass flywheel further comprises a second spacer axially arranged between the elastic cover plate and the main cover plate, the elastic cover plate elastically biasing the main cover plate through the second spacer.

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

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

[0020] According to one optional embodiment of the present disclosure, the dual-mass flywheel further comprises one or more swing damper assemblies mounted to the secondary flywheel, the anti-rollover portion being arranged to be staggered with the swing damper assemblies in a circumferential direction.

[0021] The present disclosure also relates to a driveline system comprising a dual-mass flywheel as described above,

[0022] The present disclosure also relates to a vehicle comprising a driveline system as described above. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference made to the accompanying drawings in which:

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

[0025] Figure 2 is Figure 1 An internal view of the dual-mass flywheel shown without the main cover plate and the elastic cover plate;

[0026] Figure 3is a sectional view of a dual-mass flywheel whose elastic cover plate includes an anti-inversion portion according to a first embodiment of the present disclosure;

[0027] Figure 4 is shown in detail Figure 3 is shown in detail

[0028] Figure 5 is a sectional view of a dual-mass flywheel whose elastic cover plate includes an anti-inversion portion according to a second embodiment of the present disclosure;

[0029] Figure 6 is shown in detail Figure 5 is shown in detail

[0030] Figure 7 is shown in detail

[0031] In the various figures, the same or similar components are denoted by the same reference signs. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure.

[0033] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "one", "a", or "the" and similar words used in the specification and claims of the present disclosure do not denote a quantity of one but denote the presence of at least one. The terms "include" or "contain" and similar words mean that the elements or objects before the word encompass the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "first", "second", and similar words used in the specification and claims of the present disclosure do not denote any order, number, or importance, but are used to distinguish different components. "Up", "down", "left", "right", and the like are used only to indicate relative positional relationships in the drawings, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly. The term "axial", "axial direction" refers to the extension direction of the rotational axis X of the dual-mass flywheel, the term "radial", "radial direction" is the direction orthogonal to the rotational axis X, and the term "circumferential", "circumferential direction" is the circumferential direction around the rotational axis X.

[0034] Various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Here, it is to be noted that in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repetitive descriptions thereof will be omitted. It is to be understood that the double mass flywheel shown in the drawings can omit one or more components that are not related to the technical solution of the present disclosure for the sake of clarity.

[0035] Figure 1 An assembled double mass flywheel 100 is shown, Figure 2 In Figure 1 the main cover plate and the elastic cover plate are removed to show the internal structure of the double mass flywheel 100.

[0036] The double mass flywheel 100 comprises a primary flywheel 1 and a secondary flywheel 2, both of which are 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, as an input side and an output side of the double mass flywheel 100. With reference to Figure 2 , two springs 8 are placed between the primary flywheel 1 and the secondary flywheel 2. The springs 8 are, for example, arc-shaped coil compression springs, and are capable of acting on 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 double mass flywheel 100 further comprises a swing damper assembly 10 mounted to the secondary flywheel 2, which has a swing block inside and is capable of swinging within a certain range around the rotation axis X relative to the secondary flywheel 2, thereby absorbing and mitigating torque fluctuations through inertial action.

[0037] The double mass flywheel 100 maintains its assembled configuration by means of a main cover plate 3 and an 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] With reference to the sectional view shown in Figure 3 and Figure 5 , the main cover plate 3 can be welded to the upwardly turned radially outer rim of the primary flywheel 1, which is located overall axially above the secondary flywheel 2. That is, the main cover plate 3 and the primary flywheel 1 are located respectively on both sides of the secondary flywheel 2 in the axial direction. It is to be understood that other fastening means of the main cover plate 3 to the primary flywheel 1 are also conceivable.

[0039] With reference to the sectional view shown in Figure 4 and Figure 6 , the elastic cover plate 4 comprises a central portion 41, an outer extension portion 42, and an intermediate portion 43 arranged between the central portion 41 and the outer extension portion 42. The elastic cover plate 4 is fastened to the secondary flywheel 2 by means of the central portion 41. In Figure 5 and Figure 6In the illustrated embodiment, the central portion 41 of the elastic cover plate 4 is tightly clamped between the secondary flywheel 2 and the spline portion riveted to the secondary flywheel 2. It should be understood that other fastening manners of the elastic cover plate 4 to the secondary flywheel 2 are also conceivable. The intermediate portion 43 of the elastic cover plate 4 extends axially upward and radially outward from the central portion 41, i.e. at an angle to the radial direction, toward the primary cover plate 3. The outer extension 42 of the elastic cover plate 4 extends axially upward and radially outward from the intermediate portion 43, i.e. at an angle to the radial direction, toward the primary cover plate 3. The radially outer edge of the outer extension 42 is elastically biased against the primary cover plate 3. Since the extension direction of the outer extension 42 is at an angle to the radial direction, the biasing force of the outer extension 42 against the primary cover plate 3 is in axial direction or at least has a component in axial direction. The reaction force of the primary cover plate 3 acts on the elastic cover plate 4, which in turn axially biases the secondary flywheel 2 toward the primary flywheel 1, acting to keep the two together in axial direction.

[0040] The dual-mass flywheel 100 comprises a first spacer 6 arranged axially between the primary flywheel 1 and the secondary flywheel 2. The first spacer 6 spaces the primary flywheel 1 and the secondary flywheel 2 apart, reducing the frictional force between the two by preventing direct contact between the two, avoiding that the relative rotation between the two is impeded by the frictional force. In particular, the first spacer 6 is made of a plastic material, 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 the frictional force between the primary flywheel 1 and the secondary flywheel 2. Moreover, the first spacer 6 also acts to arrange the primary flywheel 1 and the secondary flywheel 2 coaxially.

[0041] The dual-mass flywheel 100 further comprises a second spacer 7 arranged axially between the elastic cover plate 4 and the primary cover plate 3. The second spacer 7 spaces the elastic cover plate 4 and the primary cover plate 3 apart, the elastic cover plate being biased against the second spacer 7, which in turn is biased against the primary cover plate 3. In particular, the second spacer 7 is made of a plastic material, while the elastic cover plate 4 and the primary cover plate 3 are made of metal. Thus, the second spacer 7 replaces the metal-metal friction between the elastic cover plate 4 and the primary cover plate 3 with a metal-plastic friction, reducing the frictional force.

[0042] The outer extension 42 of the elastic cover plate 4 is inclined to the radial direction at a first angle which is smaller than a second angle at which the intermediate portion 43 is inclined to the radial direction. The large inclination angle of the intermediate portion 43 causes the elastic cover plate 4 to extend rapidly upward at the radial inner portion, avoiding interference with the swing damper assembly 10. The elastic cover plate 4 transitions from the intermediate portion 43 to the outer extension 42 by means of a first bend 44. Optionally, the outer extension 42 is inclined to the radial direction at an angle comprised between 5° and 10°. Preferably, the outer extension 42 is inclined to the radial direction at an angle of 8°.

[0043] The secondary flywheel 2 is not locked to the primary flywheel 1 in the axial direction, but can float axially to some extent, thereby buffering axial vibrations that the dual mass flywheel 100 is subjected to. When the secondary flywheel 2 is subjected to an 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 becomes smaller. 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 vibrations 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 becomes larger again, and the secondary flywheel 2 is also biased back to its initial axial position.

[0044] During transport and handling of the dual mass flywheel 100, it can be subjected to axial vibrations that are much greater than those during operation. The strength of the elastic cover plate 4 is set for the operating environment of the dual mass flywheel 100 and is not sufficient to withstand the axial vibrations of the dual mass flywheel 100 during transport and handling. In extreme cases, the angle of extension of the elastic cover plate 4 relative to the radial direction can be reversed. Figure 7 A schematic diagram of such a reversal is shown. As shown, in normal cases, the outer extension 42 of the elastic cover plate 4 is inclined upwards, i.e. extends axially towards the main cover plate 3. When the angle of extension of the elastic cover plate 4 relative to the radial direction is reversed, the outer extension 42 is reversed to be inclined downwards, i.e. extends axially away from the main cover plate 3, as shown by the dashed line in Figure 7 In this way, the reversed elastic cover plate 4 can no longer bias the main cover plate 3 via the outer extension 42 and can no longer provide a biasing force that keeps the secondary flywheel 2 and the primary flywheel 1 together in the axial direction.

[0045] To this end, the dual mass flywheel 100 according to the present disclosure prevents the angle of extension of the elastic cover plate 4 relative to the radial direction from being reversed by providing a reversal prevention 5 on the elastic cover plate 4. Figure 3 and Figure 4 A first embodiment of the reversal prevention 5 is shown, Figure 5 and Figure 6 A second embodiment of the reversal prevention 5 is shown.

[0046] With reference to Figure 3 and Figure 4 In the first embodiment, the reversal prevention 5 is formed by a structural reinforcement 45 arranged on the elastic cover plate 4. The structural reinforcement 45 extends from the first bend 44 connecting the outer extension 42 and the intermediate portion 43 onto the outer extension 42. The structural reinforcement 45 reinforces the first bend 44 so that it is not easily bent to a large extent, avoiding the outer extension 42 from being reversed from being inclined upwards to being inclined downwards. In the embodiment shown in Figure 4 the structural reinforcement 45 is a stamped reinforcement rib. Figure 4It is shown that the elastic cover plate 4 has three reinforcing ribs arranged uniformly in the circumferential direction. It can be understood that the number of reinforcing ribs can be different.

[0047] Reference is made to Figure 5 and Figure 6 In the second embodiment, the anti-inversion portion 5 is constituted by a tab 46 arranged on the elastic cover plate 4. The tab 46 extends from the radially outer edge of the outer extension 42 toward the secondary flywheel 2. When the elastic cover plate 4 is deformed to such an extent that the radially outer edge of the outer extension 42 moves downward too much, the tab 46 abuts against the secondary flywheel 2, preventing further deformation of the elastic cover plate 4, thereby preventing inversion of the elastic cover plate 4. In the preferred embodiment shown in the drawings, the secondary flywheel 2 is arranged with a guide hole 21, and the tab 46 comprises a base portion 46a connected to the radially outer edge and a tooth portion 46b extending from the base portion 46a and inserted into the guide hole 21. The base portion 46a is sized to be larger than the guide hole 21, so as to be unable to be inserted into the guide hole 21. The guide hole 21 can guide the downward movement of the tooth portion 46b, while the base portion 46a can abut against the secondary flywheel 2, preventing further deformation of the elastic cover plate 4, thereby preventing inversion of the elastic cover plate 4. The tab 46 can also be formed by stamping, and the elastic cover plate 4 has a plurality of tabs 46 arranged uniformly in the circumferential direction, for example two or more.

[0048] In the first and second embodiments of the anti-inversion portion 5, the anti-inversion portion 5 is staggered with the swing damper assembly 10 in the circumferential direction, avoiding interference with the swing damper assembly 10. To this end, the elastic cover plate 4 further comprises a positioning protrusion 47 provided on the central portion 41, to angularly position the elastic cover plate 4 (and the anti-inversion portion 5 provided thereon) when assembled.

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

[0050] According to yet another aspect of the present disclosure, a vehicle is proposed, comprising the transmission system as described above.

[0051] Some features, structures or characteristics in one or more embodiments of the present disclosure can be appropriately combined.

[0052] Some features, structures or characteristics in one or more embodiments of the present disclosure can be appropriately combined.

[0053] The above is a summary of the disclosure and should not be considered an interpretation of its full extent. While several illustrative embodiments of the disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the disclosure. Accordingly, all such modifications are intended to be included within the scope of the disclosure as defined in the claims. It is to be understood that the above is a description of the disclosure and should not be considered an interpretation of its full extent, which is defined in the appended claims.

Claims

1. A dual mass flywheel (100) characterized by, The dual-mass flywheel (100) comprises: a primary flywheel (1) arranged about a rotation axis (X); a secondary flywheel (2) arranged about the rotation axis (X) and rotatable relative to the primary flywheel (1); a main cover plate (3) fastened to the primary flywheel (1), wherein the secondary flywheel (2) is arranged in an axial direction between the primary flywheel (1) and the main cover plate (3); a resilient cover plate (4) fastened to the secondary flywheel (2), extending at an angle to a radial direction towards the main cover plate (3), and elastically biasing the main cover plate (3) in the axial direction, wherein the resilient cover plate (4) comprises an anti-inversion portion (5) for preventing the resilient cover plate (4) from inverting the angle of extension relative to the radial direction.

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

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

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

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

6. The dual-mass flywheel (100) according to claim 2 or 3, characterized in that the resilient cover plate (4) further comprises a tab (46) extending from a radially outer edge of the outer extension portion (42) towards the secondary flywheel (2) and ablatable against the secondary flywheel (2) when the resilient cover plate (4) is deformed, the tab (46) forms the anti-inversion portion (5).

7. The dual-mass flywheel (100) according to claim 6, characterized in that a guide hole (21) is arranged on the secondary flywheel (2); the tab (46) comprises a base portion (46a) connected to the radially outer edge and a tooth portion (46b) extending from the base portion (46a) and inserted into the guide hole (21), wherein the base portion (46a) is sized so as not 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 bending portion, and The anti-inversion portion (5) is formed by a structure reinforcement portion (45) arranged on the elastic cover plate (4), at least a portion of the structure reinforcement portion (45) is arranged on the second bending portion.

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

10. The dual mass flywheel (100) according to any one of claims 1 to 6, characterized in that, The dual mass flywheel (100) further comprises a second spacer (7) arranged axially between the elastic cover plate (4) and a main cover plate (3), 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 5, characterized in that, The outer extension portion (42) is inclined at a first angle relative to the radial direction, and the intermediate portion (43) is inclined at a second angle relative to the radial direction, the second angle is greater than the first angle.

12. The dual mass flywheel (100) according to any one of claims 2 to 6, characterized in that, The outer extension portion (42) is inclined at an angle relative to the radial direction, the angle 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) further comprises one or more swing damper assemblies (10) mounted to the secondary flywheel (2), the anti-inversion portion (5) is arranged to be staggered with the swing damper assemblies (10) in a circumferential direction.

14. A drive system characterized by, The transmission system comprises the dual mass flywheel (100) according to any one of claims 1 to 13.

15. A vehicle characterized by comprising: The vehicle comprises the transmission system according to claim 14.

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