Planet wheel type three-mass flywheel torsion damper for engine

Abstract

The invention discloses a planet wheel type three-mass flywheel torsion damper for an engine. The damper comprises a first rotation inertia assembly, a third rotation inertia assembly and a second rotation inertia assembly which are arranged in sequence. The two ends of the third rotation inertia assembly are in transmission connection with the first rotation inertia assembly and the second rotation inertia assembly correspondingly, and the third rotation inertia assembly conducts multi-stage weakening on vibration force transmitted to the second rotation inertia assembly by the first rotation inertia assembly based on the multi-gear meshing path dispersion technology and the spring damping technology; the vibration reduction theory and the dynamic coupling principle of a planetary gear train and a dual-mass flywheel can be fused, a brand-new vibration reduction structure is provided, the vibration suppression effect is remarkably improved, and the engineering applicability is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of torsional vibration reduction of power transmission systems, in particular to a planetary gear type three-mass flywheel torsional vibration reducer for an engine. Background Art

[0002] As the core subsystem of a vehicle, the smooth operation of the automotive powertrain directly affects the comfort, reliability and safety of the vehicle. Among them, the torsional vibration of the engine crankshaft is one of the key issues that restrict the performance of the powertrain. This vibration is mainly caused by the reciprocating motion of the engine piston and the periodic ignition impact, which can cause irregular operation of the powertrain. If it is not effectively controlled, it will not only significantly reduce the vehicle's gear shifting smoothness and noise, vibration and harshness (NVH) performance, but will also accelerate the wear of transmission components in the long term, posing a potential threat to the reliability of the powertrain and the safety performance of the entire vehicle.

[0003] To address the above issues, the Dual Mass Flywheel (DMFW), a vibration damping device widely used in automotive powertrain systems, effectively suppresses torsional vibrations through its unique structural design. Specifically, the Dual Mass Flywheel torsional vibration damper (DMF) shifts the natural frequency of the powertrain to the non-operating range through the tuning action of the spring-damper system, thereby avoiding the resonance caused by the coupling of high-frequency excitation and the natural frequency, ensuring that there is no torsional resonance within the vehicle's normal driving speed range. It is currently the mainstream technical solution for suppressing engine torsional vibrations.

[0004] In the field of research on the dynamic characteristics of transmission systems, relevant scholars have carried out a lot of work; for example, Song Yimin's team innovatively adopted a tie-rod follower reference coordinate system for the 3K-II spur planetary transmission system, constructed a translation-torsion coupling dynamic model, and effectively revealed the evolution law of the inherent vibration characteristics of this type of transmission; research shows that the load-sharing characteristics of planetary gears are closely related to the symmetry of the radial layout of the planetary gears, while the dynamic response of the system is significantly affected by the nonlinear change of the tooth side clearance; although planetary gear transmission has the advantages of small size, light inertia, compact structure, speed division or convergence function, multi-point meshing power transmission, smooth transmission and high efficiency, its coordinated application with dual-mass flywheels still faces challenges.

[0005] However, the current dual-mass flywheel system still has inherent structural bottlenecks in engineering applications, which are mainly reflected in the following aspects: First, the problem of coordinating the stiffness and damping parameters of the vibration reduction mechanism is prominent, and it is difficult to achieve dynamic decoupling design, resulting in difficulty in balancing the vibration reduction performance of the system under different working conditions; second, the time-varying characteristics of the parameters lead to insufficient long-term stability of the system, making it difficult to adapt to long-term operation needs; especially under the electromechanical coupling conditions of hybrid vehicles (such as frequent starting and stopping, power source switching and torque mutation scenarios), the above defects are further amplified, the system's energy dissipation efficiency is significantly reduced, the vibration suppression function fails, and broadband noise leakage is caused. A vibration amplification effect is formed in a specific frequency band, which ultimately seriously restricts the NVH performance of the vehicle and becomes a key obstacle to improving vehicle comfort and reliability. Summary of the Invention

[0006] The object of the present invention is to provide a planetary gear three-mass flywheel torsional vibration damper for an engine in response to the above-mentioned problems in the prior art, thereby solving all or one of the above-mentioned problems in the prior art.

[0007] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows: The present invention provides a planetary gear type three-mass flywheel torsional vibration damper for an engine, comprising: A first rotational inertia component, a third rotational inertia component, and a second rotational inertia component are sequentially arranged; The two ends of the third rotational inertia component are respectively transmission-connected to the first rotational inertia component and the second rotational inertia component. The third rotational inertia component performs multi-stage attenuation of the vibration force transmitted from the first rotational inertia component to the second rotational inertia component based on multi-gear meshing path dispersion technology and spring damping technology.

[0008] As an improved solution, the first rotational inertia component includes: a primary flywheel, and the primary flywheel is vertically arranged.

[0009] As an improved solution, the second rotational inertia component includes: a secondary flywheel, which is arranged parallel to the primary flywheel and at one side of the primary flywheel, and a distance is set between the secondary flywheel and the primary flywheel.

[0010] As an improved solution, the third rotational inertia component is composed of a planetary gear train and a spring damping element that are transmission-connected to each other; The planetary gear train and the spring damping element are sequentially arranged between the secondary flywheel and the primary flywheel. The planetary gear train is in driving connection with the primary flywheel, and the spring damping element is in driving connection with the secondary flywheel.

[0011] As an improved solution, the planetary gear train includes: a sun gear, a ring gear, and a pair of planetary gears parallel to the sun gear and symmetrically arranged around the sun gear; The sun gear is parallel to and close to the primary flywheel, and the two planetary gears are respectively engaged with the sun gear; One side of the primary flywheel is coaxially and transmission-connected to a planet carrier, the planet carrier is arranged parallel to the primary flywheel, the center of the planet carrier is coaxially connected to a horizontally arranged transmission shaft, and a pair of planet shafts parallel to the transmission shaft are respectively provided on both sides of the planet carrier; The two planetary shafts are respectively connected to the two planetary gears, and one end of the transmission shaft is coaxially connected to the sun gear; The ring gear is arranged parallel to the primary flywheel, and is sleeved outside the two planetary gears, and the ring gear is meshed with the two planetary gears.

[0012] As an improved solution, a redundant space is provided inside the ring gear near the sun gear and the two planetary gears, and the spring damping element is provided in the redundant space; The transmission shaft is coaxially connected to the center of the front surface of the spring damping element, the secondary flywheel is arranged on the other side of the ring gear relative to the primary flywheel, and the center of the secondary flywheel is coaxially connected to the center of the rear surface of the spring damping element in the ring gear; The primary flywheel is used to drive the sun gear to rotate using the planet carrier, and the sun gear is used to drive the two planetary gears to revolve around the sun gear and rotate on their own when rotating; the two planetary gears are used to drive the ring gear to rotate; the spring damping element is used to rotate under the drive of the planet carrier to achieve a vibration reduction effect.

[0013] As an improved solution, the gear ring body is a cylindrical shell, which is arranged parallel to the primary flywheel, and the front surface of the cylindrical shell is open, and the center of the rear surface of the cylindrical shell is provided with a through hole; An inner wall edge of the opening on the front surface of the cylindrical housing is provided with internal teeth along the circumference of the cylindrical housing, and the internal teeth are respectively engaged with the two planetary gears; The spring damping element is arranged in the cylindrical housing at a position on one side of the inner teeth.

[0014] As an improved solution, the spring damping element includes: an inertia disc arranged parallel to the primary flywheel, a spring damping portion arranged along the circumference of the inertia disc and installed on one side of the inertia disc, and a cover plate; The cover plate is arranged above the spring damping part, and a cavity is formed between the cover plate and the inertia disk, and the spring damping part is located in the cavity; The central axis positions of the cover plate and the inertia disk are hollow, and the cover plate is fixedly connected to the inertia disk via a connecting piece; The central axis of the inertia disc passes through the through hole, and the center of the secondary flywheel is connected to the central axis of the inertia disc passing through the through hole.

[0015] As an improved solution, the spring damping part includes: a plurality of damping blocks and a plurality of arc springs; A plurality of the damping blocks are evenly arranged on the front surface of the inertia disk along the circumference of the inertia disk, a distance is set between adjacent damping blocks, and adjacent damping blocks are connected by an arc spring.

[0016] As an improved solution, the primary flywheel, the planet carrier, the sun gear, the cover plate, the inertia disk and the secondary flywheel are all coaxially arranged.

[0017] The beneficial effects of the technical solution of the present invention are: The present invention proposes a new vibration reduction structure by innovatively integrating the vibration reduction theory and dynamic coupling principle of the planetary gear system and the dual-mass flywheel, which significantly improves the vibration suppression effect and enhances engineering applicability. First, the arc spring part based on the third rotational inertia component can initially attenuate the vibration; then, by utilizing the power diversion characteristics of the planetary gear, the vibration energy that is not completely attenuated is dispersed and transferred to the additional mass at the free end. Combined with the synergistic effect of multiple inertia bodies, the vibration isolation bandwidth of the system is effectively expanded, the vibration suppression effect is further enhanced, and ultimately ideal vibration reduction performance is achieved; this structural design takes into account both efficient vibration reduction and engineering practicality, is easier to promote and apply in actual scenarios, makes up for the shortcomings of the existing technology, and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 1 is a front view schematic diagram of the structure of a planetary gear type three-mass flywheel torsional vibration damper for an engine according to an embodiment of the present invention; Figure 2 AA sectional view of the planetary gear type three-mass flywheel torsional vibration damper for an engine according to an embodiment of the present invention; Figure 3 1. It is a schematic diagram of the exploded structure of the planetary gear type three-mass flywheel torsional vibration damper for an engine according to an embodiment of the present invention; Figure 4 Schematic diagram of the exploded structure of the spring damping element in the planetary gear three-mass flywheel torsional vibration damper for an engine according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the actual effect of the ring gear in the planetary gear type three-mass flywheel torsional vibration damper for the engine according to an embodiment of the present invention; Figure 6 Schematic diagram of the working principle of the planetary gear three-mass flywheel torsional vibration damper for an engine according to an embodiment of the present invention; Figure 7 3. It is a schematic diagram comparing the test results of simulation tests on the planetary gear type three-mass flywheel torsional vibration damper for the engine according to the embodiment of the present invention and the existing dual-mass flywheel; The symbols in the accompanying drawings are described as follows: 1. Primary flywheel; 2. Planetary gears; 3. Planet carrier; 4. Transmission shaft; 5. Sun gear; 6. Ring gear; 7. Spring damper element; 8. Bolts; 9. Secondary flywheel; 10. Cylindrical housing; 101, internal gear; 102, through hole; 301, planetary shaft; 701, cover plate; 702, arc spring; 703, inertia disk; 704, damping block. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0022] The terms "first," "second," and the like in the specification and claims herein and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device. Example

[0023] This embodiment provides a planetary gear three-mass flywheel torsional vibration damper for an engine, such as Figures 1 to 7 Shown, including: The first rotating inertia component is composed of a primary flywheel 1, which is vertically arranged at the leftmost position; The second rotational inertia component is composed of a secondary flywheel 9, which is arranged parallel to the primary flywheel 1 and at one side of the primary flywheel 1, with a distance between the secondary flywheel 9 and the primary flywheel 1; The third rotation inertia component is disposed between the primary flywheel 1 and the secondary flywheel 9, and transmits the primary flywheel 1 and the secondary flywheel 9 to each other; Specifically, the third rotational inertia component is composed of a planetary gear train and a spring damping element; The planetary gear train includes: a sun gear 5, a ring gear 6, and two planetary gears 2 that are parallel to the sun gear 5 and symmetrically arranged around the sun gear 5; In a preferred embodiment, the sun gear 5 is arranged parallel to and close to the primary flywheel 1, and the two planetary gears 2 are meshed with the sun gear 5. A planetary carrier 3 is coaxially and transmission-connected to the primary flywheel 1. The planetary carrier 3 is arranged parallel to the primary flywheel 1. A horizontally arranged transmission shaft 4 is coaxially connected to the center of the planetary carrier 3. A pair of planetary shafts 301 are provided on either side of the planetary carrier 3, parallel to the transmission shaft 4. The two planetary shafts 301 of the planetary carrier 3 are transmission-connected to the two planetary gears 2 respectively, and the right end of the transmission shaft 4 is coaxially transmission-connected to the sun gear 5. In a preferred embodiment, the ring gear 6 is arranged parallel to the primary flywheel 1 and is sleeved outside the two planetary gears 2, and the ring gear 6 meshes with the two planetary gears 2. A redundant space is provided inside the ring gear 6 near the sun gear 5 and the two planetary gears 2, and a spring damping element is provided in the redundant space to facilitate the synchronous rotation of various components and achieve a vibration reduction effect. The secondary flywheel 9 is arranged on the other side of the ring gear 6 relative to the primary flywheel 1, and the center of the secondary flywheel 9 is connected to the center of the spring damping element in the ring gear 6 by a bolt 8. Based on the above connection relationship, the sun gear 5 drives the planetary gears 2 to revolve around the sun gear 5 and rotate on their own, thereby driving the ring gear 6 to rotate through the planetary gears 2. In a preferred embodiment, the main body of the ring gear 6 is a cylindrical housing 10, which is arranged parallel to the primary flywheel 1 and is designed with an open front surface facing the primary flywheel 1. A through hole 102 is provided at the center of the rear surface of the cylindrical housing. Internal teeth 101 are provided along the circumference of the cylindrical housing 10 at the inner wall edge of the front surface opening of the cylindrical housing 10. The internal teeth 101 are respectively engaged with the two planetary gears 2; a spring damping element is provided in the cylindrical housing at a position on one side of the internal teeth 101; In a preferred embodiment, the spring damping element comprises: an inertia disc 703 arranged parallel to the primary flywheel 1, a spring damping portion arranged circumferentially along and mounted on one side of the inertia disc 703, and a cover plate 701. The cover plate 701 is disposed over the spring damping portion, and a cavity is formed between the cover plate 701 and the inertia disc 703. The spring damping portion is located within the cavity. The central axis of the cover plate 701 and the inertia disc 703 is hollow, and the cover plate 701 is fixedly connected to the inertia disc 703 via a plurality of connectors (such as rivets). The central axis of the inertia disc 703 passes through a through hole 102 in the rear surface of the cylindrical housing 10. The center of the secondary flywheel 9 is connected to the central axis of the inertia disc 703 passing through the cylindrical housing 10 via a bolt 8. The right end of the transmission shaft 4 of the planetary carrier 3 extends to the center of the cover plate 701 and is connected to the cover plate 701, thereby achieving a transmission connection with the spring damping element. In a preferred embodiment, the spring damping portion is composed of a plurality of damping blocks 704 and a plurality of arc springs 702; the plurality of damping blocks 704 are evenly distributed along the circumference of the inertia disk 703 on the side of the inertia disk 703 facing the cover plate 701, with a distance between adjacent damping blocks 704, and adjacent damping blocks 704 are connected by an arc spring 702; In a preferred embodiment, the primary flywheel 1 , the planet carrier 4 , the sun gear 5 , the cover plate 701 , the inertia disk 703 and the secondary flywheel 9 are all coaxially arranged.

[0024] In a preferred embodiment, the working principle of this device is as follows: The first rotating inertia assembly is connected to the transmission output shaft, allowing the torsional vibration generated by the engine to be transmitted to the first rotating inertia assembly and then to the third rotating inertia assembly and the second rotating inertia assembly. To address the vibration caused by power transmission, the primary flywheel 1 rotates based on the external power input, and the sun gear 5 rotates accordingly, simultaneously driving the planetary gears 2 to revolve around the sun gear 5 and rotate on their own. The rotation of the planetary gears 2 drives the ring gear 6 to rotate, and the rotation of the ring gear 6 transmits power to the secondary flywheel 9 through the spring damping element. Due to the effects of planetary gear 2 and spring damping elements, when vibration occurs, the torque fluctuation is dispersed through the multi-gear meshing path at planetary gear 2. Its power diversion characteristics can reduce the vibration amplitude of a single transmission chain. At the same time, by adjusting the gear meshing stiffness and the transmission ratio of the spring damping elements, the system dynamic characteristics are optimized to avoid coupling with the DMF vibration reduction frequency band. Ultimately, planetary gear 2 will generate an inertial force opposite to the vibration direction, thereby offsetting part of the vibration energy. Planetary gear 2 and spring damping elements form a multi-stage vibration reduction system to achieve the best vibration reduction effect.

[0025] In addition, in order to illustrate the technical effect of this device, it was simulated and tested together with the existing dual-mass flywheel, and a Matlab simulation diagram of the amplitude-frequency characteristic indicators of the two was obtained. It can be seen from the figure that this device retains the basic vibration isolation function of the dual-mass flywheel while improving the mid-frequency resonance characteristics and widening the effective vibration isolation frequency band, which is especially suitable for complex working conditions that are sensitive to vibration.

[0026] It should be noted that the examples herein are only for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0027] Different from the existing technology, the planetary gear three-mass flywheel torsional vibration damper for the engine of the present application can initially attenuate the vibration based on the arc spring part of the third rotational inertia component; then, by utilizing the power diversion characteristics of the planetary gear, the vibration energy that has not been completely attenuated is dispersed and transferred to the additional mass at the free end. Combined with the synergistic effect of multiple inertia bodies, the vibration isolation bandwidth of the system is effectively expanded, the vibration suppression effect is further enhanced, and ultimately ideal vibration reduction performance is achieved.

[0028] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0029] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0030] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0031] Those skilled in the art will clearly understand that, for the sake of convenience and brevity of description, the specific logical process of the method described above can refer to the corresponding working processes of the systems, devices and units in the aforementioned method embodiments, and will not be repeated here.

[0032] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices, or units, or can be an electrical, mechanical, or other form of connection.

[0033] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments herein.

[0034] In addition, the functional units in the various embodiments herein may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0035] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A planetary gear three-mass flywheel torsional vibration damper for an engine, characterized in that: include: A first rotational inertia component, a third rotational inertia component, and a second rotational inertia component are sequentially arranged; The two ends of the third rotational inertia component are respectively transmission-connected to the first rotational inertia component and the second rotational inertia component. The third rotational inertia component performs multi-stage attenuation of the vibration force transmitted from the first rotational inertia component to the second rotational inertia component based on multi-gear meshing path dispersion technology and spring damping technology.

2. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 1, characterized in that: The first rotational inertia component comprises a primary flywheel (1), wherein the primary flywheel (1) is arranged vertically.

3. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 2, characterized in that: The second rotational inertia component comprises a secondary flywheel (9), wherein the secondary flywheel (9) is arranged parallel to the primary flywheel (1) at a side position of the primary flywheel (1), and a distance is provided between the secondary flywheel (9) and the primary flywheel (1).

4. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 3, characterized in that: The third rotational inertia component is composed of a planetary gear train and a spring damping element that are transmission-connected to each other; The planetary gear train and the spring damping element are sequentially arranged between the secondary flywheel (9) and the primary flywheel (1); the planetary gear train is in transmission connection with the primary flywheel (1); and the spring damping element is in transmission connection with the secondary flywheel (9).

5. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 4, characterized in that: The planetary gear train comprises: a sun gear (5), a ring gear (6), and a pair of planetary gears (2) parallel to the sun gear (5) and symmetrically arranged around the sun gear (5); The sun gear (5) is arranged parallel to the primary flywheel (1) and close to the primary flywheel (1), and the two planetary gears (2) are respectively engaged with the sun gear (5); One side of the primary flywheel (1) is coaxially and transmission-connected to a planet carrier (3), the planet carrier (3) is arranged parallel to the primary flywheel (1), the center of the planet carrier (3) is coaxially connected to a horizontally arranged transmission shaft (4), and a pair of planetary shafts (301) parallel to the transmission shaft (4) are respectively provided on both sides of the planet carrier (3); The two planetary shafts (301) are respectively connected to the two planetary gears (2) in a transmission manner, and one end of the transmission shaft (4) is coaxially connected to the sun gear (5); The ring gear (6) is arranged parallel to the primary flywheel (1), and the ring gear (6) is sleeved outside the two planetary gears (2), and the ring gear (6) is meshed with the two planetary gears (2).

6. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 5, characterized in that: A redundant space is provided inside the ring gear (6) near the sun gear (5) and the two planetary gears (2), and the spring damping element is provided in the redundant space; The transmission shaft (4) is coaxially connected to the center of the front surface of the spring damping element, the secondary flywheel (9) is arranged at the other side of the ring gear (6) relative to the primary flywheel (1), and the center of the secondary flywheel (9) is coaxially connected to the center of the rear surface of the spring damping element in the ring gear (6); The primary flywheel (1) is used to drive the sun gear (5) to rotate by using the planet carrier (3); the sun gear (5) is used to drive the two planetary gears (2) to revolve around the sun gear (5) and rotate by themselves when rotating; the two planetary gears (2) are used to drive the ring gear (6) to rotate; and the spring damping element is used to rotate under the drive of the planet carrier (3) to achieve a vibration reduction effect.

7. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 6, characterized in that: The gear ring (6) body is a cylindrical shell (10), the cylindrical shell (10) is arranged parallel to the primary flywheel (1), and the front surface of the cylindrical shell (10) is designed to be open, and a through hole (102) is provided at the center of the rear surface of the cylindrical shell (10); Internal teeth (101) are provided at the inner wall edge of the front surface opening of the cylindrical housing (10) along the circumference of the cylindrical housing (10), and the internal teeth (101) are respectively engaged with the two planetary gears (2); The spring damping element is arranged in the cylindrical housing (10) at a position on one side of the inner tooth (101).

8. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 7, characterized in that: The spring damping element comprises: an inertia disc (703) arranged parallel to the primary flywheel (1), a spring damping portion arranged along the circumference of the inertia disc (703) and mounted on one side of the inertia disc (703), and a cover plate (701); The cover plate (701) is arranged above the spring damping part, and a cavity is formed between the cover plate (701) and the inertia disk (703), and the spring damping part is located in the cavity; The central axis positions of the cover plate (701) and the inertia disk (703) are designed to be hollow, and the cover plate (701) is fixedly connected to the inertia disk (703) via a connecting piece; The central axis of the inertia disc (703) passes through the through hole (102), and the center of the secondary flywheel (9) is connected to the central axis of the inertia disc (703) passing through the through hole (102).

9. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 8, characterized in that: The spring damping portion comprises: a plurality of damping blocks (704) and a plurality of arc springs (702); A plurality of the damping blocks (704) are evenly distributed on the front surface of the inertia disk (703) along the circumference of the inertia disk (703), a distance is provided between adjacent damping blocks (704), and adjacent damping blocks (704) are connected via an arc spring (702).

10. The planetary gear type three-mass flywheel torsional vibration damper for an engine according to claim 9, characterized in that: The primary flywheel (1), the planet carrier (4), the sun gear (5), the cover plate (701), the inertia disk (703), and the secondary flywheel (9) are all coaxially arranged.

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