Flywheel device and power system

Abstract

The present invention discloses a flywheel device and a power system, wherein the flywheel device comprises: a first mass component, the first mass component is used for transmission connection with an engine; a second mass component; a torque limiting component, the torque limiting component is arranged on the second mass component, the torque limiting component comprises: an elastic member, a pressure plate and a friction plate, the elastic member abuts between the second mass component and the pressure plate, the pressure plate is also pressed on the friction plate, the friction plate is provided with a first friction surface; a spline hub, the spline hub is used for transmission connection with a gearbox, the spline hub is provided with a second friction surface, and the second friction surface contacts and cooperates with the first friction surface. Such a structure is simpler, the maximum torque that the output end of the spline hub can receive is the static friction force generated by the friction plate, when the torque at the input end is greater than the static friction force, slippage will occur between the spline hub and the second mass component, and a large torque cannot be transmitted to the crankshaft end of the engine, thereby preventing the crankshaft from being damaged by excessive torque.

Description

Technical Field

[0001] The present invention relates to the technical field of flywheels, and in particular to a flywheel device and a power system. Background Art

[0002] At present, flywheels are mainly used in vehicle power systems, usually installed between the engine and the gearbox to provide vibration and noise reduction functions for the wheels. In hybrid vehicles, due to the use of internal combustion engines, shock absorbers must generally be installed at the crankshaft output end of the engine. Due to the particularity of the powertrain structure of some hybrid vehicles, there is no clutch between the engine and the gearbox to limit the torque. In this type of application, the flywheel must have a torque limiting function.

[0003] In the related art, the torque-limiting flywheel structure generates friction between the friction plate and the steel plate, and then transmits torque by riveting the steel plate. However, this has many structural components and the torque transmission is more complicated. In addition, the flywheel generally uses several short straight springs for vibration reduction, which results in a relatively small torsion angle of the flywheel and a general overall vibration isolation effect. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a flywheel device, which can reduce the torque transmitted to the crankshaft end of the engine, avoid the crankshaft from being damaged by excessive torque, and the friction plate directly contacts the spline hub to obtain friction force, thereby transmitting and limiting torque. The structure is simpler.

[0005] The present invention further proposes a power system.

[0006] According to the flywheel device of the present invention, it includes: a first mass component, which is used to be connected to the engine transmission; a second mass component; an elastic vibration-damping element, which is arranged between the first mass component and the second mass component; a torque-limiting component, which is arranged on the second mass component, and the torque-limiting component includes: an elastic member, a pressure plate and a friction plate, the elastic member abuts between the second mass component and the pressure plate, the pressure plate is also pressed on the friction plate, and the friction plate is provided with a first friction surface; a spline hub, which is used to be connected to the gearbox transmission, and the spline hub is provided with a second friction surface, and the second friction surface is in contact with and cooperates with the first friction surface.

[0007] According to the flywheel device of the present invention, a first friction surface is provided on the friction plate, and a second friction surface is provided on the spline hub, and the second friction surface is in contact with the first friction surface. Such a structure is simpler, and the maximum torque that the output end of the spline hub can accept is the static friction force generated by the friction plate. When the torque at the input end is greater than the static friction force, slippage will occur between the spline hub and the second mass component, and a large torque cannot be transmitted to the crankshaft end of the engine, thereby reducing the torque transmitted to the crankshaft end of the engine and avoiding damage to the crankshaft due to excessive torque.

[0008] In some examples of the present invention, there are at least two friction plates, and at least two friction plates are distributed on both sides of the spline hub, and the second friction surface is provided on both sides of the spline hub.

[0009] In some examples of the present invention, the second mass component includes: a second mass flywheel and a flange, the flange is fixedly connected to the second mass flywheel, the flange is abutted against the elastic vibration damping element, the elastic member abuts against the second mass flywheel, at least one friction plate is arranged between the pressure plate and the spline hub, and at least one friction plate is arranged between the flange and the spline hub.

[0010] In some examples of the present invention, the second mass component further includes: a plurality of rivets, the plurality of rivets penetrate the second mass flywheel and the flange and are spaced apart in the circumferential direction.

[0011] In some examples of the present invention, the elastic vibration-damping element is an arc spring, the arc spring is disposed in the first mass component, and a portion of the second mass component extends into the first mass component and abuts against an end of the arc spring.

[0012] In some examples of the present invention, there are at least two arc springs, and the at least two arc springs are spaced apart in the circumferential direction of the first mass component, and a portion of the second mass component abuts against an end of each arc spring.

[0013] In some examples of the present invention, there are two arc springs, and the central angle change value corresponding to the compression of each arc spring from the initial position to the limit position is α, and α satisfies the relationship: 50°≤α≤70°.

[0014] In some examples of the present invention, the first mass component includes: a first mass flywheel and a cover plate, the first mass flywheel is formed with a groove, the elastic vibration damping element is arranged in the groove, and the cover plate is fixedly connected to the first mass flywheel and covers the groove.

[0015] In some examples of the present invention, the first mass component further includes: a starting ring gear, the starting ring gear is disposed on the cover plate, and the starting ring gear is used for transmission connection with the starter.

[0016] The power system according to the present invention comprises: an engine; a gearbox; and the flywheel device mentioned above, wherein the first mass component is transmission-connected to the engine, and the second mass component is transmission-connected to the gearbox.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of a flywheel device according to an embodiment of the present invention;

[0020] Figure 2 is a partial exploded view of a flywheel device according to an embodiment of the present invention;

[0021] Figure 3 is a plan view of a flywheel device according to an embodiment of the present invention;

[0022] Figure 4 is the plan view of the first mass flywheel;

[0023] Figure 5 is the plan view of the flange;

[0024] Figure 6 is a plan view of the friction plate;

[0025] Figure 7 is a plan view of the spline hub;

[0026] Figure 8 yes Figure 7 Cross-sectional view along the AA direction.

[0027] Reference numerals:

[0028] Flywheel device 1;

[0029] First mass assembly 10; first mass flywheel 11; cover plate 12; groove 13; starter gear ring 14;

[0030] Second mass assembly 20; second mass flywheel 21; flange 22; elastic vibration damping element 30;

[0031] Torque limiting assembly 40; elastic member 41; pressure plate 42; friction plate 43; first friction surface 44;

[0032] Spline hub 50 ; second friction surface 51 . DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0034] Reference below Figure 1-Figure 8 A flywheel device 1 according to an embodiment of the present invention is described.

[0035] like Figure 1-Figure 3 As shown, the flywheel device 1 according to the embodiment of the present invention comprises: a first mass component 10, a second mass component 20, an elastic vibration damping element 30, a torque limiting component 40 and a spline hub 50. The first mass component 10 is used for transmission connection with the engine, and the engine can transmit power to the first mass component 10. The first mass component 10 is transmission connected with the second mass component 20, so that the power and torque on the first mass component 10 can be transmitted backward to the second mass component 20, and the second mass component 20 can be transmitted to the gearbox to realize power transmission, so that the vehicle can be driven on the road.

[0036] The elastic vibration damping element 30 is elastic and is disposed between the first mass component 10 and the second mass component 20. The elastic vibration damping element 30 can buffer the torque transmission between the first mass component 10 and the second mass component 20, thereby reducing the torsional vibration at the engine end and making the torque transmission smoother.

[0037] like Figure 1-Figure 3 As shown, the torque limiting component 40 can play a torque limiting function. The torque limiting component 40 is set on the second mass component 20, so that the torque on the second mass component 20 can be transmitted to the torque limiting component 40, thereby reducing the torque output and preventing the crankshaft from being damaged due to excessive torque.

[0038] The torque limiting assembly 40 includes: an elastic member 41, a pressure plate 42 and a friction plate 43. The elastic member 41 abuts between the second mass assembly 20 and the pressure plate 42. The elastic member 41 can give a certain elastic pressure to the pressure plate 42. The pressure plate 42 is also pressed on the friction plate 43. The pressure plate 42 can press the friction plate 43, and the torque can be transmitted to the friction plate 43 through the elastic member 41 and the pressure plate 42.

[0039] like Figure 1 , Figure 6-Figure 8As shown, the friction plate 43 is provided with a first friction surface 44, the spline hub 50 is used for transmission connection with the gearbox, and the spline hub 50 is provided with a second friction surface 51, and the second friction surface 51 is in contact with the first friction surface 44. That is to say, when the torque is transmitted from the friction plate 43 to the spline hub 50, due to the friction between the first friction surface 44 of the friction plate 43 and the second friction surface 51 of the spline hub 50, the spline hub 50 will rotate with the second mass component 20, so that the spline hub 50 and the gearbox are splined, so that the power of the engine end can be finally transmitted to the gearbox through the spline hub 50.

[0040] It should be noted that, since the spline hub 50 and the second mass component 20 apply pressure to the friction plate 43 through the elastic member 41, thereby generating friction to transmit the input torque of the engine end, the maximum torque that the output end of the spline hub 50 can receive is the static friction generated by the friction plate 43. When the torque at the input end is greater than the static friction, relative rotation will occur between the spline hub 50 and the second mass component 20, that is, slippage will occur, and at this time, a larger torque cannot be transmitted to the output end. Similarly, if a large torque is generated at the output end and transmitted to the spline hub 50, slippage will also occur between the spline hub 50 and the second mass component 20, and a large torque cannot be transmitted to the crankshaft end of the engine, thereby reducing the torque transmitted to the crankshaft end of the engine and avoiding damage to the crankshaft due to excessive torque. In addition, the maximum torque that the flywheel device 1 can transmit needs to be guaranteed by the friction coefficients between the friction plate 43 and the spline hub 50, the friction plate 43 and the second mass component 20, the spatial dimensions of the second mass component 20, and the pressure generated by the elastic member 41.

[0041] Therefore, by providing the torque limiting component 40, the flywheel device 1 can have a torque limiting function, so that the flywheel device 1 can be more widely used in the hybrid power system. Moreover, since the flywheel device 1 is provided with the first mass component 10 and the second mass component 20, it can have the characteristics of a common dual-mass flywheel, and the generated rotational inertia is large, and the total rotational inertia can be 1.3-1.5 kgm 2 , this larger moment of inertia in the transmission system can also effectively reduce torsional vibration and transmit smoother torque to the output end.

[0042] In addition, compared with the traditional flywheel with torque limiting function, the flywheel device 1 of the present invention omits the steel plate and adopts the method of direct contact and friction between the friction plate 43 and the spline hub 50 to transmit power and limit torque. On the one hand, this can avoid extending the power transmission path and make the power transmission smoother. On the other hand, it can save the assembly steps, make the flywheel device 1 structure simpler and more compact, avoid the later power transmission problems caused by assembly problems, and reduce costs.

[0043] Among them, Figure 1 As shown, there are at least two friction plates 43, and at least two friction plates 43 are distributed on both sides of the spline hub 50, and second friction surfaces 51 are provided on both sides of the spline hub 50. At least two friction plates 43 are provided, and at least two friction plates 43 are distributed on the second friction surfaces 51 on both sides of the spline hub 50, so that the friction effect between the spline hub 50 and the second mass component 20 can be better guaranteed, so that the spline hub 50 can rotate with the second mass component 20, and when the torque at the input end is greater than the static friction force, relative rotation occurs between the spline hub 50 and the second mass component 20. It can be understood that there is at least one friction plate 43 located on one side of the spline hub 50, and the specific number of friction plates 43 can be set according to actual conditions.

[0044] According to an optional embodiment of the present invention, Figure 1 , Figure 2 and Figure 5 As shown, the second mass component 20 includes: a second mass flywheel 21 and a flange 22, the flange 22 is fixedly connected to the second mass flywheel 21, the flange 22 is abutted against the elastic vibration damping element 30, the elastic member 41 abuts against the second mass flywheel 21, at least one friction plate 43 is arranged between the pressure plate 42 and the spline hub 50, and at least one friction plate 43 is arranged between the flange 22 and the spline hub 50.

[0045] The flange 22 is fixedly connected to the second mass flywheel 21, so that the flange 22 and the second mass flywheel 21 can form a whole, which is convenient for the installation of the second mass component 20. The flange 22 is abutted with the elastic damping element 30. After the first mass component 10 transfers the torque to the elastic damping element 30, the elastic damping element 30 can directly contact the flange 22 to transfer the torque to the flange 22, thereby causing the second mass component 20 to rotate and transfer the torque. The elastic member 41 abuts against the second mass flywheel 21, so that the second mass flywheel 21 can better transfer the torque to the spline hub 50 through the elastic member 41, thereby achieving effective transmission and output of the torque. At least one friction plate 43 is arranged between the pressure plate 42 and the spline hub 50, and at least one friction plate 43 is arranged between the flange 22 and the spline hub 50, so that there is friction between the pressure plate 42 and the spline hub 50, and there is also friction between the flange 22 and the spline hub 50, so that the friction effect between the spline hub 50 and the second mass component 20 can be better guaranteed. There may be two friction plates 43 . One friction plate 43 is disposed between the pressure plate 42 and the spline hub 50 , and one friction plate 43 is also disposed between the flange 22 and the spline hub 50 .

[0046] Furthermore, if Figure 3As shown, the second mass component 20 also includes: a plurality of rivets, the plurality of rivets penetrate the second mass flywheel 21 and the flange 22, and the plurality of rivets are spaced apart in the circumferential direction. The plurality of rivets penetrate the second mass flywheel 21 and the flange 22, so that the second mass flywheel 21 and the flange 22 can be fixed together to form a whole, which is convenient for the installation of the second mass component 20. The plurality of rivets are spaced apart in the circumferential direction, so that the connection stability between the second mass flywheel 21 and the flange 22 is improved, and the structure of the second mass component 20 is more reliable. The number of rivets can be 8, and can also be set according to actual conditions.

[0047] Alternatively, if Figure 1-Figure 3 As shown, the elastic damping element 30 is an arc spring, which is arranged in the first mass component 10, and a part of the second mass component 20 extends into the first mass component 10, and the second mass component 20 abuts against the end of the arc spring. The elastic damping element 30 is an arc spring, and a circumferentially long arc spring, which is arranged in the first mass component 10. The compression of the arc spring can filter out the large torsional vibration between the first mass component 10 and the second mass component 20, and can improve the torsional vibration reduction effect of the flywheel device 1. A part of the second mass component 20 (i.e., a part of the flange 22) extends into the first mass component 10, and a part of the second mass component 20 abuts against the end of the arc spring. The rotation of the first mass component 10 can drive the rotation and compression of the arc spring, and then the two ends of the arc spring will contact the flange 22 of the second mass component 20, thereby transmitting the torque to the second mass component 20.

[0048] In addition, if Figure 1-Figure 3 As shown, there are at least two arc springs, and at least two arc springs are arranged at intervals in the circumferential direction of the first mass component 10, and a portion of the second mass component 20 abuts and matches with the end of each arc spring. At least two arc springs are arranged, and at least two arc springs are arranged at intervals in the circumferential direction of the first mass component 10, so that the arc springs can better transmit torque, and a portion of the second mass component 20 abuts and matches with the end of each arc spring, so that the rotation of the first mass can drive the rotation and compression of each arc spring, and then the two ends of each arc spring will contact with a portion of the second mass component 20, thereby transmitting the torque to the second mass component 20. As shown Figure 5 As shown, two opposite protrusions are arranged on the outer periphery of the flange 22, and the two protrusions correspond to the ends of the two arc springs respectively.

[0049] Specifically, Figure 3As shown, there are two arc springs, and the change value of the central angle corresponding to the compression of each arc spring from the initial position to the extreme position is α, and α satisfies the relationship: 50°≤α≤70°. Two arc springs are set, and such an arrangement is more convenient, and the ends of the two arc springs can better abut and cooperate with a part of the second mass component 20. The compression of the two arc springs can more smoothly transmit the torque to the second mass component 20, and the range of the change value of the central angle corresponding to the compression of the two arc springs from the initial position to the extreme position is set to: 50°≤α≤70°, so that the angle of compression of the arc spring in the circumferential direction can be as large as possible, which is beneficial to the torsional vibration reduction of the flywheel device 1, and the torsional vibration reduction effect is better. Among them, the change value of the central angle corresponding to the compression of the arc spring from the initial position to the extreme position can be 60°.

[0050] Of course, if Figure 1 , Figure 2 and Figure 4 As shown, the first mass assembly 10 includes: a first mass flywheel 11 and a cover plate 12, the first mass flywheel 11 is formed with a groove 13, the elastic damping element 30 is arranged in the groove 13, the cover plate 12 is fixedly connected to the first mass flywheel 11, and the cover plate 12 covers the groove 13. The groove 13 is arranged on the first mass flywheel 11, and the elastic damping element 30 can be arranged in the groove 13, which can play a certain limiting role, and can also limit the rotation and compression path of the elastic damping element 30, so that the elastic damping element 30 can only move in the groove 13, ensuring the accuracy of torque transmission. In addition, the cover plate 12 is fixedly connected to the first mass flywheel 11, and the cover plate 12 covers the groove 13, so that the cover plate 12 can further limit the elastic damping element 30, and prevent the elastic damping element 30 from being separated from the groove 13 under the pressure of the first mass assembly 10 and the second mass assembly 20. Among them, the first mass flywheel 11 and the cover plate 12 can be fixedly connected by welding, for example, laser welding.

[0051] In addition, Figure 1 and Figure 2 As shown, the first mass component 10 also includes: a starter gear ring 14, which is arranged on the cover plate 12, and the starter gear ring 14 is used to be connected to the starter. The cover plate 12 and the starter gear ring 14 can be fixed together by welding. It should be noted that when the vehicle is started, the key is first turned on to turn on the starter, and the starter gear ring 14 is used to be connected to the starter, so that the starter can be driven by the starter gear ring 14, and then the engine can be driven to work, and then the engine can rely on its own combustion, that is, the power inertia to operate continuously. By setting the starter gear ring 14, the starter can transmit the starting power through the first mass component 10, thereby driving the engine, and in this way, the space on the cover plate 12 can be reasonably utilized, and the second mass component 20 will not be affected.

[0052] The power system according to the embodiment of the present invention comprises: an engine, a gearbox and the flywheel device 1 described in the above embodiment, wherein the first mass component 10 is connected to the engine by transmission, and the spline hub 50 is connected to the gearbox by transmission. The first mass component 10 is connected to the engine by transmission, and the engine can transmit the torque through the first mass component 10, thereby reducing the torque transmitted to the crankshaft end of the engine and avoiding damage to the crankshaft due to excessive torque. The second mass component 20 is connected to the gearbox by transmission through the spline hub 50, so that the engine can transmit power to the gearbox through the first mass component 10, the second mass component 20 and the spline hub 50, thereby enabling the gearbox to work normally.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present invention, a first feature "above", "above" and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0056] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flywheel device, It is characterized in that include: A first mass component, the first mass component is used for transmission connection with the engine; a second mass component; an elastic vibration-damping element, wherein the elastic vibration-damping element is disposed between the first mass component and the second mass component; A torque limiting component, the torque limiting component is arranged on the second mass component, the torque limiting component comprises: an elastic member, a pressure plate and a friction plate, the elastic member abuts between the second mass component and the pressure plate, the pressure plate is also pressed on the friction plate, and the friction plate is provided with a first friction surface; The spline hub is used for transmission connection with the gearbox, and the spline hub is provided with a second friction surface, and the second friction surface is in contact with the first friction surface.

2. The flywheel device according to claim 1, It is characterized in that There are at least two friction plates, and at least two friction plates are distributed on both sides of the spline hub. Both sides of the spline hub are provided with the second friction surface.

3. The flywheel device according to claim 2, It is characterized in that The second mass component includes: a second mass flywheel and a flange, the flange is fixedly connected to the second mass flywheel, the flange is abutted against the elastic vibration damping element, the elastic member abuts against the second mass flywheel, at least one friction plate is arranged between the pressure plate and the spline hub, and at least one friction plate is arranged between the flange and the spline hub.

4. The flywheel device according to claim 3, It is characterized in that The second mass component further includes: a plurality of rivets, which penetrate the second mass flywheel and the flange and are spaced apart in the circumferential direction.

5. The flywheel device according to claim 1, It is characterized in that The elastic vibration-damping element is an arc spring, which is arranged in the first mass component. A part of the second mass component extends into the first mass component and abuts against an end of the arc spring.

6. The flywheel device according to claim 5, It is characterized in that There are at least two arc springs, which are spaced apart in the circumferential direction of the first mass component, and a portion of the second mass component abuts against an end of each arc spring.

7. The flywheel device according to claim 6, It is characterized in that There are two arc springs, and the change value of the central angle corresponding to each arc spring being compressed from the initial position to the limit position is α, and α satisfies the relationship: 50°≤α≤70°.

8. The flywheel device according to claim 1, It is characterized in that The first mass component comprises: a first mass flywheel and a cover plate, the first mass flywheel is formed with a groove, the elastic vibration-damping element is arranged in the groove, and the cover plate is fixedly connected to the first mass flywheel and covers the groove.

9. The flywheel device according to claim 8, It is characterized in that The first mass component further includes: a starting gear ring, which is arranged on the cover plate and is used for transmission connection with the starter.

10. A power system, It is characterized in that include: engine; Gearbox; The flywheel device according to any one of claims 1 to 9, wherein the first mass component is drivingly connected to the engine, and the spline hub is drivingly connected to the gearbox.

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