Elastic assembly and flywheel assembly

Abstract

The present application discloses an elastic assembly and a flywheel assembly, which are used to solve the problem of insufficient reliability when the flywheel rotates. The elastic assembly includes a first gasket, a second gasket and an elastic sheet, wherein the elastic sheet is arranged between the first gasket and the second gasket, and the elastic assembly is arranged on the connecting device of the flywheel assembly; and also includes a buffer elastic sheet; wherein the buffer elastic sheet and the elastic sheet are both arranged between the first gasket and the second gasket, and a central circular hole is arranged at the center of the buffer elastic sheet, so that the buffer elastic sheet is sleeved on the connecting device through the central circular hole, and the buffer elastic sheet is provided with a plurality of first circular holes distributed along the circumference of the central circular hole, and the positions of the plurality of first circular holes correspond to the positions of the second circular holes on the elastic sheet.

Description

Technical Field

[0001] The present application relates to the field of flywheel equipment, and in particular to an elastic assembly and a flywheel assembly. Background Art

[0002] The flywheel is a disc component installed between the engine crankshaft and the motor shaft, which is used to realize the power transmission from the crankshaft to the motor shaft. In the process of the crankshaft driving the motor shaft to rotate through the flywheel assembly, the shaft torsional vibration stress generated by the rotation of the shaft system between the crankshaft and the motor shaft can easily lead to structural fatigue of the flywheel assembly. One possible situation is that the torque stress caused by the torsional vibration between the crankshaft, flywheel assembly and motor shaft is transmitted to the flywheel assembly, causing the torque stress to concentrate on the edges of some parts of the flywheel assembly, causing cracking of the parts, such as the elastic assembly on the connecting bolts. The occurrence of the above situation makes the reliability of the flywheel assembly not guaranteed. Summary of the invention

[0003] The present application provides an elastic assembly and a flywheel assembly, which are used to improve the reliability of the flywheel assembly during rotation.

[0004] In a first aspect, the present application provides an elastic assembly, comprising a first gasket, a second gasket and an elastic sheet, wherein the elastic sheet is arranged between the first gasket and the second gasket, and the elastic assembly is arranged on a connecting device of a flywheel assembly, comprising:

[0005] Buffer elastic sheet; wherein,

[0006] The buffer elastic sheet and the elastic sheet are both arranged between the first gasket and the second gasket. A central circular hole is provided at the center of the buffer elastic sheet, so that the buffer elastic sheet is sleeved on the connecting device through the central circular hole. The buffer elastic sheet is provided with a plurality of first circular holes distributed circumferentially along the central circular hole, and the positions of the plurality of first circular holes correspond to the positions of the second circular holes on the elastic sheet.

[0007] The above-mentioned application embodiment arranges a buffer elastic sheet between the first gasket and the second gasket, so that the buffer elastic sheet can block part of the axial stress transmission, avoiding the breakage of the elastic sheet due to stress concentration, thereby effectively improving the reliability of the elastic assembly, and is also beneficial to improving the reliability of the flywheel assembly where the elastic assembly is located.

[0008] In a possible implementation manner, the buffer elastic sheet is respectively arranged between the elastic sheet and the first gasket, and between the elastic sheet and the second gasket.

[0009] In a possible implementation manner, the thickness of the buffer elastic sheet is not greater than 2 mm.

[0010] In a possible implementation manner, the material of the buffer elastic sheet is 65# manganese or 70# spring steel.

[0011] In a possible implementation manner, a number of arc-shaped holes are distributed on the elastic sheet.

[0012] In a second aspect, the present application provides a flywheel assembly, comprising:

[0013] Wheel body: comprising an inner flywheel and an outer flywheel, wherein the inner flywheel and the outer flywheel are connected by bolts, and the connection between the bolts is provided with the elastic assembly as described in the first aspect and any possible implementation manner;

[0014] Connecting disk: The connecting disk is used to connect the outer minute wheel and the motor shaft.

[0015] In a possible implementation manner, a plurality of third circular holes are provided on the connecting disk.

[0016] In a possible implementation manner, the area of ​​the pressed contact surface between the outer flywheel and the connecting disk is not less than 7.9×10 4 square millimeter.

[0017] In a possible implementation manner, the thickness of the buffer elastic sheet in the elastic assembly is not less than the thickness of the elastic sheet.

[0018] In a possible implementation manner, the outer flywheel includes a first stop and a second stop, and the inner flywheel includes a third stop; wherein,

[0019] The first stop is located on the surface of the outer flywheel opposite to the connecting disk, and is used for radially positioning the connecting disk; the second stop is located on the surface of the outer flywheel opposite to the inner flywheel, and is used together with the third stop to radially position the elastic assembly, and the third stop is located on the surface of the inner flywheel opposite to the outer flywheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of an elastic assembly provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of the buffer elastic sheet provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of the elastic sheet provided in the embodiment of the present application;

[0023] Figure 4 A cross-sectional view of a flywheel assembly provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of the connection disk provided in an embodiment of the present application.

[0025] Figure numbers: 10-elastic assembly; 11-first gasket; 12-second gasket; 13-buffer elastic sheet; 14-elastic sheet; 15-connecting device; 131-center circular hole; 132-first circular hole; 141-arc hole; 142-second circular hole; 40-flywheel assembly; 41-wheel body; 42-connecting plate; 411-inner flywheel; 412-third stop; 413-outer flywheel; 414-second stop; 415-first stop; 421-third circular hole; 422-pressing contact surface; 43-crankshaft. DETAILED DESCRIPTION

[0026] In view of the problem of insufficient reliability of the flywheel assembly during rotation in the prior art, the present application proposes an elastic assembly applied to the connecting device of the flywheel assembly. The elastic assembly includes a buffer elastic sheet, which is sleeved on the aforementioned connecting device together with the elastic sheet and the gasket through its central circular hole. Since the stress of any component is always transmitted from both sides to the inside during the rotation of the shaft system, the buffer elastic sheet in the embodiment of the present application can effectively block the transmission path of part of the stress, thereby reducing the stress intensity concentrated on the arc hole of the elastic sheet, avoiding the elastic sheet from breaking due to stress concentration, so that the reliability of the above-mentioned elastic assembly is significantly improved, and at the same time, the reliability of the flywheel assembly where the elastic assembly is located is also improved.

[0027] In order to better understand the above technical scheme, the technical scheme of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0028] Generally, the flywheel assembly is an important device located between the energy output shaft and the energy input shaft, which is used to store energy and inertia outside the power stroke of the engine, and drives the energy input shaft to rotate through the energy output shaft. The above-mentioned energy output shaft can be a crankshaft, and the energy input shaft can be a motor shaft. During the rotation of the flywheel assembly, torsional vibration causes stress to be transmitted on the crankshaft, flywheel assembly, and motor shaft, especially on the connecting device in the flywheel assembly. The crankshaft is one of the most important components in the engine. When working, the crankshaft is simultaneously subjected to the action of the gas force in the cylinder, the inertia force of the reciprocating mass and the rotating mass, and the torque at the power output end. These periodic excitation loads, the guide shaft system torsional vibration, cause alternating bending stress and torsional stress in various parts such as the engine crank, so that the crankshaft will produce uneven stress distribution and stress concentration in the axial variable section, transition fillet, crank arm and other places. The above-mentioned torsional vibration (i.e. shaft system torsional vibration) refers to the situation that the main engine transmits power to the energy receiving device through the shaft system, resulting in unequal torsional angles between the shaft sections and the shaft sections swinging back and forth. That is to say, when a shaft with a certain rigidity (such as a crankshaft or motor shaft) is rotating, torsional vibration is always inevitable. However, torsional vibration and stress have adverse effects on components such as the flywheel assembly on the crankshaft: as time goes by, the part where stress is concentrated is very likely to break, resulting in a decrease in the reliability of the flywheel assembly, and even affecting the life of the components where the flywheel assembly is located (such as the diesel engine).

[0029] The present application provides an elastic assembly applied to a flywheel assembly connection device. Figure 1 This is a cross-sectional view of an elastic assembly provided in an embodiment of the present application. Figure 1 As shown, the elastic assembly 10 includes a first gasket 11, a second gasket 12, a buffer elastic sheet 13, and an elastic sheet 14. The number of the elastic sheets 14 may be greater than 1, and a plurality of elastic sheets 14 may be overlapped, and the buffer elastic sheet 13 and the elastic sheet 14 may be disposed between the first gasket 11 and the second gasket 12.

[0030] Figure 2 Schematic diagram of the structure of the buffer elastic sheet 13 provided in the embodiment of the present application. Figure 2 As shown, the buffer elastic sheet 13 is provided with a central circular hole 131 and first circular holes 132 distributed along the circumference of the central circular hole 131. The provision of the first circular hole 132 can effectively reduce the moment of inertia of the buffer elastic sheet 13 and reduce the stress generated by the buffer elastic sheet 13 itself. The central circular hole 131 is used to enable the buffer elastic sheet 13 to be sleeved on the connecting device 15. Figure 3 FIG. 1 is a schematic diagram of the structure of the elastic sheet 14. Figure 2 , Figure 3The position of the first circular hole 132 on the buffer elastic sheet 13 is arranged opposite to the second circular hole 142 on the elastic sheet 14. The elastic sheet 14 is provided with arc holes 141. The arrangement of the arc holes 141 can reduce the rotational inertia of the elastic sheet 14 and the elastic assembly 10 when the flywheel rotates, and provide axial compensation, thereby avoiding elastic displacement of the elastic assembly 10. It can be seen that the arc holes 141 on the elastic sheet 14 ensure that the elastic assembly 10 can absorb the elastic displacement, so that the elastic assembly 10 can be fixed on the connecting device 15. The connecting device 15 can be a bolt. At the same time, during the rotation of the flywheel assembly, the elastic assembly 10 receives stress, which leads to the problem of stress concentration.

[0031] Stress concentration refers to the phenomenon that stress in a local area is significantly increased due to a sudden change in the geometric shape and size of the load-bearing parts. The phenomenon that the stress on the surface and internal defects of the material is much greater than the average stress when the material is subjected to stress is called stress concentration, or stress concentration for short. For the elastic assembly 10 in the embodiment of the present application, stress concentration mainly occurs at the edge of the arc hole 141 of the elastic sheet 14. Therefore, in the embodiment of the present application, the buffer elastic sheet 13 is provided in the elastic assembly 10, which can effectively reduce the intensity of the stress transmitted to the elastic sheet 14. That is to say, in the embodiment of the present application, even if stress is still transmitted to the elastic sheet 14 and stress concentration occurs on the arc hole 141, since the stress intensity has been reduced, fractures no longer occur at the edge of the arc hole 141, and thus the reliability of the above-mentioned elastic assembly 10 is effectively improved.

[0032] In one embodiment of the present application, the buffer elastic sheet 13 can be respectively arranged between the first gasket 11 and the elastic sheet 14, and between the second gasket 12 and the elastic sheet 14, so that the elastic assembly 10 is as follows: Figure 1 The order of arrangement is as shown in the figure: the first gasket 11 and the second gasket 12 are located on both sides of the elastic assembly 10, followed by the buffer elastic sheet 13, and the elastic sheet 14 is arranged between the buffer elastic sheets 13, so that the stress received by all the elastic sheets 14 passes through the buffer elastic sheet 13 and the strength is reduced, thereby effectively avoiding the occurrence of stress concentration on the arc hole 141 of the elastic sheet 14 and causing the problem of breakage.

[0033] In one embodiment of the present application, the thickness of the buffer elastic sheet 13 can be set to 2 mm to improve the protective effect of the buffer elastic sheet 13 on the elastic sheet 14. The material of the elastic sheet 14 and the buffer elastic sheet 13 can be 65# manganese or 70# spring steel.

[0034] Based on the above elastic assembly 10, the present application also provides a flywheel assembly. Figure 4 This is a cross-sectional view of the flywheel assembly provided in the embodiment of the present application. Figure 4As shown, the flywheel assembly 40 is arranged on the crankshaft 43, including a wheel body 41, and a connecting plate 42. Among them, the connecting plate 42 is used to connect the outer flywheel 413 and the motor shaft. The wheel body 41 includes an inner flywheel 411 and an outer flywheel 413, and the inner flywheel 411 and the outer flywheel 413 are connected by bolts 15. The connection of the bolts 15 is provided with the aforementioned elastic assembly 10. In the above-mentioned elastic assembly 10, the thickness of the buffer elastic sheet 13 can be set to be not less than the thickness of the elastic sheet 14, so as to ensure that the buffer elastic sheet 13 can effectively protect the elastic sheet 14, avoid stress concentration on the arc hole 141 of the elastic sheet 14, and cause the elastic assembly 10 to break.

[0035] By providing an elastic assembly 10 at the bolt connection of the wheel body 41, the flywheel assembly 40 can significantly reduce the influence of stress on the structure during rotation, ensuring that the flywheel assembly 40 can simultaneously meet the requirements for stiffness and elasticity during use and does not fatigue due to stress, thereby significantly reducing the risk of broken shaft.

[0036] In one embodiment of the present application, a first stop 415 and a second stop 414 are respectively provided on the outer flywheel 413, and a third stop 412 is provided on the inner flywheel 411. The first stop 415 is located on the surface of the outer flywheel 413 on the side opposite to the connecting disk 42, and is used to radially position the connecting disk 42. The second stop 414 is located on the surface of the outer flywheel 413 on the side opposite to the inner flywheel 411, and the third stop 412 is located on the surface of the inner flywheel 411 on the side opposite to the outer flywheel 413. The second stop 414 and the third stop 412 can be used together to radially position the elastic assembly 10. The above-mentioned first stop 415, the second stop 414, and the third stop 412 can ensure that the components in the flywheel assembly 40 are tightly connected, thereby achieving the purpose of improving the power output of the flywheel assembly 40.

[0037] Figure 5 This is a schematic diagram of the structure of a connection disk provided in an embodiment of the present application. Figure 5 As shown, a plurality of third circular holes 421 are provided on the connection disk 42. The third circular holes 421 can reduce the weight of the connection disk 42, thereby reducing the rotational inertia of the connection disk 42 and the flywheel assembly 40 where the connection disk 42 is located, thereby further improving the reliability of the connection between the wheel body 41 and the connection disk 42 in the flywheel assembly 40, and reducing the stress on the connection shaft, thereby effectively improving the reliability of the flywheel assembly 40.

[0038] In one embodiment of the present application, the area of ​​the compression contact surface 422 between the outer flywheel 413 and the connecting plate 42 is not less than 7.9×10 4Square millimeters. That is, the pressing contact surface 422 is arranged on the outer circumference of the end surface of the outer flywheel 413. The embodiment of the present application can ensure that a larger torque is transmitted under the same axial force condition by increasing the area of ​​the pressing contact surface 422. Therefore, the setting of the pressing contact surface 422 in the above-mentioned embodiment of the application can effectively improve the torque transmission capacity of the flywheel assembly 40.

[0039] Furthermore, in order to verify the reliability of the above-mentioned flywheel assembly 40, the embodiment of the present application performs simulations on the above-mentioned flywheel assembly 40 and a flywheel assembly that does not include the buffer elastic sheet 13, respectively. Please refer to Table 1.

[0040] Table 1

[0041] Flywheel assembly serial number Axial stiffness Fatigue safety factor Flywheel assembly A 1.8KN / mm 1.339 Flywheel assembly B 1.9KN / mm 1.631 Flywheel assembly C 2.0KN / mm 1.341

[0042] The flywheel assembly B is as follows Figure 4 The flywheel assembly 40 shown. In Table 1, the difference between flywheel assembly A, flywheel assembly B, and flywheel assembly C lies only in the elastic assembly. Specifically, the elastic assembly of flywheel assembly A includes 10 elastic sheets, each of which has a thickness of 1 mm. The elastic assembly of flywheel assembly B includes 8 elastic sheets and 2 buffer elastic sheets, and 1 buffer elastic sheet is provided on both sides of the 8 elastic sheets, and the thickness of the buffer elastic sheet and the elastic sheet are both 1 mm. The elastic assembly of flywheel assembly C includes 8 elastic sheets, the thickness of the middle 6 elastic sheets is 1 mm, and the thickness of the elastic sheets on both sides is 2 mm. It can be seen that the total thickness of the elastic assemblies of flywheel assemblies A, B, and C is 10 mm.

[0043] The fatigue safety factor refers to the degree of fatigue fracture of a component when it is subjected to the same force, and the influence of this degree on the overall safety of the component. Therefore, the fatigue safety factor can be used to represent the reliability of the flywheel assembly. Therefore, their reliability is ranked from high to low as follows: flywheel assembly B, flywheel assembly C, and flywheel assembly A. It can be seen that the reliability of the flywheel assembly (i.e., flywheel assembly B) provided in the embodiment of the present application is the highest. The reason why the reliability of flywheel assembly A and flywheel assembly C is not much different is that although the thickness of the outermost elastic sheet in flywheel assembly C is twice the thickness of the elastic sheet in flywheel assembly A, this thickness can reduce the risk of fracture caused by stress concentration of the outermost two elastic sheets of the elastic assembly of flywheel assembly A, but the increase in thickness causes an increase in axial stiffness, which is not conducive to the connection between the engine and the motor. Therefore, the increase in the thickness of the elastic assembly cannot significantly improve the reliability of the elastic assembly and the flywheel assembly. In other words, the improvement of the reliability of the flywheel assembly provided in the embodiment of the present application can not only reduce the risk of fatigue fracture caused by internal stress concentration of the flywheel assembly, but also ensure the safe connection between the engine and the motor.

[0044] In summary, an embodiment of the present application provides an elastic assembly, which is applied to the connecting device of the flywheel assembly. The elastic assembly blocks the stress transmitted from the outside by a buffering elastic sheet, so that the arc-shaped hole on the elastic sheet does not break due to stress concentration, thereby effectively improving the reliability of the elastic assembly. Furthermore, an embodiment of the present application provides a flywheel assembly, in which the above-mentioned elastic assembly is arranged at the bolt connection between the inner flywheel and the outer flywheel, so that the reliability of the flywheel assembly is also improved. At the same time, by arranging a third circular hole on the connecting disk, the purpose of reducing the weight of the connecting disk is achieved, thereby reducing the rotational inertia of the connecting disk and the flywheel assembly, thereby effectively reducing the risk of broken shafts and improving the reliability of the flywheel assembly.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An elastic assembly, comprising a first gasket, a second gasket and an elastic sheet, wherein the elastic sheet is arranged between the first gasket and the second gasket, and the elastic assembly is arranged on a connecting device of a flywheel assembly, It is characterized in that include: Buffer elastic sheet; wherein, The buffer elastic sheet and the elastic sheet are both arranged between the first gasket and the second gasket, and the buffer elastic sheet is respectively arranged between the elastic sheet and the first gasket, and between the elastic sheet and the second gasket. A central circular hole is arranged at the center of the buffer elastic sheet, so that the buffer elastic sheet is sleeved on the connecting device through the central circular hole. The buffer elastic sheet is provided with a plurality of first circular holes distributed along the circumference of the central circular hole, and the positions of the plurality of first circular holes correspond to the positions of the second circular holes on the elastic sheet; the thickness of the buffer elastic sheet is not less than the thickness of the elastic sheet; a number of arc holes are distributed on the elastic sheet; The flywheel assembly includes an inner flywheel, an outer flywheel and a connecting plate, the outer flywheel includes a first stop and a second stop, and the inner flywheel includes a third stop; wherein, The first stop is located on the surface of the outer flywheel opposite to the connecting disk, and is used for radially positioning the connecting disk; the second stop is located on the surface of the outer flywheel opposite to the inner flywheel, and is used together with the third stop to radially position the elastic assembly, and the third stop is located on the surface of the inner flywheel opposite to the outer flywheel.

2. The elastic assembly according to claim 1, It is characterized in that The thickness of the buffer elastic sheet is not greater than 2 mm.

3. The elastic assembly according to claim 2, It is characterized in that The material of the buffer elastic sheet is 65# manganese or 70# spring steel.

4. A flywheel assembly, It is characterized in that include: Wheel body: comprising an inner flywheel and an outer flywheel, the inner flywheel and the outer flywheel are connected by bolts, and the connection of the bolts is provided with an elastic assembly as claimed in any one of claims 1 to 3; Connecting disc: The connecting disc is used to connect the outer flywheel and the motor shaft.

5. The flywheel assembly as claimed in claim 4, It is characterized in that The connecting plate is provided with a plurality of third circular holes.

6. The flywheel assembly as claimed in claim 5, It is characterized in that The area of ​​the pressed contact surface between the outer flywheel and the connecting disk is not less than 7.9×10 4 square millimeter.

Images