Torsional vibration absorber

Abstract

The invention relates to a torsional vibration absorber which comprises a connecting piece connected between a gearbox output shaft and a rear drive transmission shaft, and the connecting piece is provided with a mounting ring extending in the axial direction of the torsional vibration absorber. The multiple buffers are arranged on the radial outer side of the mounting ring at intervals in the axial direction of the torsional vibration absorber, each buffer comprises at least one spoke spring and a mass block, and the spoke spring of each buffer is connected to the corresponding connecting piece on the radial inner side and connected to the corresponding mass block on the radial outer side; and the damping piece is arranged between any two adjacent buffers in the axial direction of the torsional vibration absorber so as to allow relative movement between the two adjacent buffers. According to the torsion vibration absorber, the diaphragm spring made of steel is arranged between any two adjacent buffers, the two adjacent buffers and the diaphragm spring can form a steel-steel friction pair, and therefore the good vibration absorption effect can be achieved when the two adjacent buffers rotate relative to each other.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle power transmission devices, and particularly to a torsional vibration absorber for reducing vibration. Background Art

[0002] The main-order torsional vibration excitation of the engine causes torsional resonance of the entire power transmission system, resulting in obvious knocking noise of gears and body vibration. It is known that a torsional vibration absorber can be added to the engine output shaft to absorb the vibration peak, so that the torsional direction mode of the torsional vibration absorber is the same as or slightly lower than the torsional mode of the transmission system. In this way, when resonance occurs on the engine output shaft, the torsional vibration absorber can effectively absorb the resonance peak of the engine output shaft, thereby reducing the resonance sound inside the vehicle. However, for a front-engine rear-wheel-drive power system, only setting a torsional vibration absorber on the engine output shaft cannot effectively improve the obvious knocking noise and torsional vibration generated in each gear of the transmission.

[0003] Moreover, the torsional vibration absorbers in the prior art usually use rubber parts as buffer elements. However, rubber parts are prone to rubber cracking, premature aging and failure after long-term use or under harsh conditions, thereby affecting the service life of the entire torsional vibration absorber. Summary of the Invention

[0004] The object of the present invention is to provide an improved torsional vibration absorber, which can adapt to the resonance frequency points of multiple gears of a vehicle and has a good vibration reduction and absorption effect on all gear conditions, and can have better vibration absorption ability.

[0005] According to an embodiment of the present invention, there is provided a torsional vibration absorber, which includes: a connecting member connected between the output shaft of the transmission and the rear-wheel drive propeller shaft, the connecting member having a mounting ring extending along the axial direction of the torsional vibration absorber; a plurality of buffers spaced axially along the torsional vibration absorber outside the radial direction of the mounting ring, each buffer including at least one spoke spring and a mass block, the spoke spring of each buffer being connected to the connecting member on the radial inner side and connected to the corresponding mass block on the radial outer side; and a damping member disposed axially between any two adjacent buffers along the torsional vibration absorber to allow relative movement between the two adjacent buffers.

[0006] In a preferred embodiment of the present invention, the damping member includes a diaphragm spring axially pressed against the spoke springs of the two adjacent buffers along the torsional vibration absorber.

[0007] In a preferred embodiment of the present invention, the diaphragm spring is in a disc shape, the outer circumference of the diaphragm spring in the radial direction is pressed against one of the two adjacent buffers, and the inner circumference of the diaphragm spring in the radial direction is pressed against the other of the two adjacent buffers.

[0008] In a preferred embodiment of the present invention, the natural frequencies of any two of the plurality of buffers are different from each other.

[0009] In a preferred embodiment of the present invention, the natural frequency of each buffer is less than 100 Hz.

[0010] In a preferred embodiment of the present invention, the connecting member further includes a connecting plate connected to the mounting ring and extending radially inward from the mounting ring along the radial direction of the torsional damper, and the connecting plate has a central hole for the transmission output shaft or the rear drive transmission shaft to pass through.

[0011] In a preferred embodiment of the present invention, the plurality of buffers are all connected to the same mounting ring on the radial inner side.

[0012] In a preferred embodiment of the present invention, the mass of each buffer is formed as a hollow ring and is concentrically arranged with the mounting ring.

[0013] In a preferred embodiment of the present invention, the radii of the masses of any two of the plurality of buffers are the same.

[0014] According to the torsional damper of the present invention, by providing a diaphragm spring made of steel between any two adjacent buffers, the adjacent two buffers can respectively form a steel-steel friction pair with the diaphragm spring, thereby achieving a good vibration absorption effect when the adjacent two buffers rotate relative to each other; at the same time, since each buffer uses a steel spoke spring as a buffer unit, compared with a torsional damper using a rubber part as a buffer unit, the durability and stability are good, so it is possible to prevent the torsional damper from affecting the service life due to premature aging and failure. Description of the Drawings

[0015] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0016] Figure 1 An isometric view of a torsional damper according to an embodiment of the present invention is shown.

[0017] Figure 2 A side view of a torsional damper according to an embodiment of the present invention is shown.

[0018] Figure 3 The resonance frequencies corresponding to the six gear positions of the transmission for the main order (2nd order) are shown.

[0019] Figure 4 A schematic diagram of the diaphragm spring in the torsional damper according to an embodiment of the present invention is shown.

[0020] Figure 5Shows the characteristic curve of the diaphragm spring in the torsional vibration absorber according to an embodiment of the present invention.

[0021] Among them, the drawings are not necessarily drawn to actual scale. Detailed implementation manners

[0022] The following further describes the implementation manners of the present invention in detail in conjunction with the drawings and embodiments, wherein the same or similar components in the drawings are labeled with the same reference numerals. The following detailed description of the embodiments and the drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0023] In the following description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. The orientation terms appearing in the following description are all the directions shown in the drawings, and do not limit the specific structure of the present invention.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. In addition, it should be understood that the term "connected against torque" means that two elements are connected in a manner that does not rotate relative to each other, so that torque can be transmitted between these two elements, and the manner of achieving the anti-torque connection can be achieved through interference fit, bolt connection, gear connection, welding, spline connection, bonding through an adhesive, etc., or by integrally forming the two elements mentioned. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] For a better understanding of the present invention, the following is combined with Figures 1 to 2 Describe the torsional vibration absorber according to an embodiment of the present invention. The torsional vibration absorber according to an embodiment of the present invention is installed between the output shaft of the gearbox and the rear drive transmission shaft, and can rotate around its rotation axis to provide a vibration damping and absorption effect for each gear of the gearbox, thereby improving the obvious knocking noise and torsional vibration generated in each gear of the gearbox. The rotation axis here refers to the central axis of the output shaft of the gearbox, or can also refer to the central axis of the rear drive transmission shaft.

[0026] Such as Figure 1 And Figure 2As shown, a torsional vibration absorber according to an embodiment of the present invention includes a connecting member 10, a plurality of buffers 20, and at least one damping member 30.

[0027] The connecting member 10 is disposed between the output shaft of the transmission and the rear drive shaft (or rear drive universal joint), and is used to connect the output shaft of the transmission and the rear drive shaft (or rear drive universal joint). The connecting member 10 has a mounting ring 11 and a connecting plate 12 connected to the mounting ring 11. The mounting ring 11 extends along the axial direction X of the torsional vibration absorber. Here, the axial direction corresponds to the direction in which the above-mentioned rotation axis extends. The connecting plate 12 extends inward along the radial direction Y of the torsional vibration absorber from the mounting ring 11. The connecting plate 12 can extend inward along the radial direction Y at any axial position of the mounting ring 11. Preferably, the connecting plate 12 extends inward along the radial direction Y from one axial end of the mounting ring 11. The outer diameter of the connecting plate 12 is the same as the outer diameter of the mounting ring 11, and the two can be integrally formed. However, it can be understood that the connecting plate 12 and the mounting ring 11 can be formed separately and then fixed to each other by welding or other means. A central hole 13 for the output shaft of the transmission or the rear drive shaft to pass through is provided on the connecting plate 12. The output shaft of the transmission or the rear drive shaft can be anti-torque mounted on the connecting plate 12 by interference fit. In addition, mounting holes 14 are also provided on the connecting plate 12, through which bolts can pass to fixedly connect the output shaft of the transmission and the rear drive shaft (or universal joint). In order to make the connection of the torsional vibration absorber more firm, the number of the mounting holes 14 can be multiple. Preferably, the number of the mounting holes 14 can be four, and the four mounting holes 14 can be evenly distributed in the circumferential direction of the central hole 13 of the connecting plate 12.

[0028] The plurality of buffers 20 can be arranged at intervals along the axial direction of the torsional vibration absorber on the radial outer side of the mounting ring 11. Each buffer 20 includes at least one spoke spring 21 and a mass block 22. The spoke spring 21 in each buffer 20 is connected to the connecting member 10 on the radial inner side and is connected to the corresponding mass block 22 on the radial outer side. The mass block 22 of each buffer 20 is formed as a hollow ring and is concentrically arranged with the mounting ring 11, that is, the mass block 22 is sleeved on the radial outer side of the mounting ring 11 through the spoke spring 21.

[0029] The spoke spring 21 is made of steel, preferably made of spring steel. Thus, when the vibration on the output shaft of the transmission is transmitted to the buffer 20 through the connecting plate 12, the torsional vibration of the spoke spring 21 can effectively reduce the vibration of the output shaft. Since each buffer 20 uses the steel spoke spring 21 as a buffer unit, compared with the torsional vibration absorber using rubber parts as a buffer unit, the steel spoke spring 21 significantly reduces the influence of aging and temperature, so that the torsional vibration absorber can be prevented from affecting the service life due to premature aging failure.

[0030] Exemplarily, the spoke spring 21 can be configured as a torsion spring rod. The spoke spring 21 can advantageously withstand the relative movement between the mass 22 located radially outside and the mounting ring 11 located radially inside, and can be simply constructed, thereby reducing the manufacturing cost of the entire torsional vibration absorber.

[0031] It can be understood that the spoke spring 21 can be manufactured separately from the mass 22 and then fixedly connected by a welding process. However, the present invention is not limited thereto. It can be understood that the spoke spring 21 and the mass 22 can be integrally formed by stamping.

[0032] As Figure 2 shown, the damping member 30 is disposed between two adjacent buffers 20 along the axial direction X of the torsional vibration absorber to allow relative movement between the two adjacent buffers 20. Preferably, a damping member 30 is provided between any two adjacent buffers 20, that is, the number of damping members 30 can be one less than the number of buffers 20. Thus, different buffers 20 can rotate relative to each other at least until a preset critical amplitude. Since the two adjacent buffers 20 can respectively rub against the damping member 30, the damping member 30 can achieve a damping and vibration reduction effect when the two adjacent buffers 20 move relative to each other.

[0033] The damping member 30 includes a diaphragm spring 31 which presses against the spoke springs 21 of two adjacent buffers 20 along the axial direction X of the torsional vibration absorber. The diaphragm can be made of steel. As described above, since the spoke spring 21 is also made of steel, the spoke springs 21 of two adjacent buffers 20 can respectively form a steel-steel friction pair with the diaphragm spring 31, and this friction pair can achieve a good vibration absorption effect when the two adjacent buffers 20 rotate relative to each other.

[0034] As Figure 4 shown, the diaphragm spring 31 is in a disc shape, and the radially outer periphery of the diaphragm spring 31 presses against one of the two adjacent buffers 20, and the radially inner periphery of the diaphragm spring 31 presses against the other of the two adjacent buffers 20. Thus, one of the two adjacent buffers 20 is in line contact with the diaphragm spring 31 on the radially outer side, and the other of the two adjacent buffers 20 is in line contact with the diaphragm spring 31 on the radially inner side. Therefore, the diaphragm spring 31 contacts the two adjacent buffers 20 over the entire circumference. Therefore, when the two adjacent buffers 20 rotate relative to each other, the contact pressure distribution between the diaphragm spring 31 and the buffers 20 is uniform, the friction pair contacts well, and thus a good vibration absorption effect can be achieved.

[0035] Thus, the damping characteristics between two adjacent buffers 20 can be determined by the elastic pressing force of the diaphragm spring 31, and preferably can be determined by the characteristic curve of the diaphragm spring 31. Figure 5shows the characteristic curve of the diaphragm spring 31, as Figure 5 shown, the diaphragm spring 31 has an ideal non-linear elastic characteristic, and the elastic pressing force remains basically unchanged within the allowable wear range of the friction plate. Therefore, using the diaphragm spring 31 as the damper 30 can ensure that the entire torsional vibration absorber can achieve good damping and vibration absorption effects during the entire service life.

[0036] The above describes using the diaphragm spring 31 as the damper 30 to achieve the vibration absorption effect. However, it can be understood that the damping and vibration absorption effect can also be achieved by other damping methods between two adjacent buffers 20. For example, a rubber member is provided between the spoke springs 21 of two adjacent buffers 20; or, the spoke springs 21 of two adjacent buffers 20 are in contact with each other; and so on.

[0037] Preferably, the natural frequencies of any two of the plurality of buffers 20 are different from each other. The natural frequency of each buffer 20 can be determined by means of the number and / or stiffness of its spoke spring 21, and / or the radius and / or mass of its mass block 22. However, when the vehicle is in different gears, the torsional stiffness and inertia distribution of the power transmission system are different, and the resonance frequency of the power transmission system will also be correspondingly different. Therefore, in the torsional vibration absorber according to the present invention, the natural frequencies of the plurality of buffers 20 can be changed with the change of the vehicle gear. That is to say, the torsional vibration absorber according to the present invention includes a plurality of buffers 20, and thus has a plurality of natural frequencies, and different frequencies correspond one by one to the resonance frequencies of different gears of the vehicle power transmission system. In this way, the torsional vibration absorber according to the present invention can have good vibration reduction and absorption performance for all gears.

[0038] The natural frequency of each buffer 20 in the torsional vibration absorber according to the present invention is less than 100 Hz. Since the torsional vibration absorber according to the present invention is installed on the output shaft of the gearbox, it only needs a natural frequency of less than 100 Hz to achieve good vibration reduction and absorption performance for the power transmission system. Figure 3 shows the frequency ranges of six buffers 20 designed for six gears of the vehicle. From Figure 3 it can be seen that when the vehicle is in the first gear, its resonance frequency is the highest, about 80 Hz, but it does not exceed 100 Hz either; when the vehicle is in the sixth gear, its resonance frequency is the lowest, about 37 Hz, and it is even less likely to exceed 100 Hz. The torsional vibration absorber according to the present invention can correspond to Figure 3Six different gears shown are used to design six buffers 20 with different natural frequencies, so as to have good vibration damping and absorption performance for all gears. For example, the natural frequency of each buffer 20 can be designed to be lower than the resonance frequency of the corresponding gear by a predetermined value (e.g., 20 Hz). Therefore, the torsional vibration absorber according to the present invention can be used in a power transmission system with multi-frequency low-frequency vibration, and has good vibration damping characteristics for each gear of the power transmission system, thereby improving the vehicle's NVH performance.

[0039] As described above, the number of buffers 20 can be designed according to the number of gears of the vehicle. For example, Figure 2 Six buffers 20 are shown, which correspond to six different gears of the transmission. However, it should be understood that the number of buffers 20 can be less than the number of gears of the vehicle. For example, although the transmission has six gears, if the vibrations generated by only several of these gears are unacceptable, then the buffers 20 can be designed only for these several gears, thereby making the design of the entire torsional vibration absorber more flexible.

[0040] Continuing to refer to Figure 2 , each buffer 20 can be designed with the number and / or stiffness of its respective spoke springs 21 and the radius and / or mass of its respective mass block 22 according to different natural frequencies to be achieved. However, the multiple buffers 20 are all connected to the same mounting ring 11 on the radial inner side. This design can enable the torsional vibration absorber to achieve multiple different natural frequencies while reducing the number of components and simplifying the structure.

[0041] As Figure 2 shown, the radii of the mass blocks 22 of any two of the multiple buffers 20 are the same. Although each buffer 20 can be designed with the number and / or stiffness of its respective spoke springs 21 and the radius and / or mass of its respective mass block 22 according to different natural frequencies to be achieved, by designing the radii of all the mass blocks 22 in the multiple buffers 20 to be the same, the axial dimensions of the entire torsional vibration absorber can be the same, thereby reducing the requirement for the installation space of the torsional vibration absorber and making its installation more convenient.

[0042] As Figure 1 shown, the number of spoke springs 21 in each buffer 20 can be multiple, and the multiple spoke springs 21 can be arranged at intervals and successively in the circumferential direction of the torsional vibration absorber. Preferably, the multiple spoke springs 21 can be divided into several groups, and the groups of spoke springs 21 can be evenly spaced in the circumferential direction of the torsional vibration absorber. This arrangement can reduce the vibration generated by each buffer 20 itself during rotation, thereby further achieving a good vibration absorption effect.

[0043] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and elements thereof can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A torsional vibration absorber, comprising: A connecting member (10) connected between an output shaft of a gearbox and a rear drive transmission shaft, the connecting member (10) having a mounting ring (11) extending axially along the torsional vibration absorber; A plurality of buffers (20) axially spaced along the torsional vibration absorber outside the radial direction of the mounting ring (11), each buffer (20) including at least one spoke spring (21) and a mass (22), the spoke spring (21) of each buffer (20) being connected to the connecting member (10) on the radial inner side and connected to the corresponding mass (22) on the radial outer side; and A damping member (30) axially disposed between any two adjacent buffers (20) along the torsional vibration absorber to allow relative movement between the two adjacent buffers (20).

2. The torsional vibration absorber according to claim 1, wherein The damping member (30) includes a diaphragm spring (31) axially pressed against the spoke springs (21) of the two adjacent buffers (20).

3. The torsional vibration absorber according to claim 2, wherein The diaphragm spring (31) is in a disc shape, the outer peripheral of the diaphragm spring (31) in the radial direction is pressed against one of the two adjacent buffers (20), and the inner peripheral of the diaphragm spring (31) in the radial direction is pressed against the other of the two adjacent buffers (20).

4. The torsional vibration absorber according to claim 1, wherein The natural frequencies of any two of the plurality of buffers (20) are different from each other.

5. The torsional vibration absorber according to claim 1, wherein The natural frequency of each buffer (20) is less than 100 Hz.

6. The torsional vibration absorber according to claim 1, wherein The connecting member (10) further includes a connecting plate (12) connected to the mounting ring (11) and extending radially inward from the mounting ring (11) along the torsional vibration absorber, the connecting plate (12) having a central hole (13) for the output shaft of the gearbox or the rear drive transmission shaft to pass through.

7. The torsional vibration absorber according to claim 1, wherein The plurality of buffers (20) are all connected to the same mounting ring (11) on the radial inner side.

8. The torsional vibration absorber according to claim 1, wherein The mass (22) of each buffer (20) is formed as a hollow ring and is concentrically arranged with the mounting ring (11).

9. The torsional vibration absorber according to claim 1, wherein The radii of the masses (22) of any two of the plurality of buffers (20) are the same.

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