Composite torsion damping device

Abstract

The invention belongs to the field of torsional vibration dampers, and particularly relates to a composite torsional vibration damping device. Comprising a first rotating part and a second rotating part; the first rotating part comprises a mass block and a vibration reduction body; the vibration reduction body is nested in the mass block, the vibration reduction body and the mass block are coaxial, and the circumferences of the vibration reduction body and the mass block are connected through uniformly distributed piezoelectric reeds; permanent magnets are arranged on the mass block by taking the axis of the vibration reduction body as a center array; the second rotating part comprises an annular electromagnetic coil, the annular electromagnetic coil and the vibration reduction body are coaxial, and the annular electromagnetic coil and the permanent magnet coincide in the space; a torque input connecting part is arranged on the axis of the damping body, and a torque output connecting part is arranged on the second rotating part; the active rigidity adjusting function of a piezoelectric material is combined with the real-time controllability of electromagnetic damping, and efficient vibration reduction under the dynamic working condition is achieved through mechanical structure optimization. Piezoelectric-electromagnetic cooperative control and structure integration optimization are achieved, the structure is simple, and the design is novel and reasonable.

Description

Technical Field

[0001] The present invention belongs to the field of torsional dampers, and particularly relates to a composite torsional damping device. Background Art

[0002] Torsional vibration in a transmission system is a harmful phenomenon caused by the periodic torque fluctuations of an engine. Its energy is transmitted and amplified through the transmission chain, leading to fatigue damage of mechanical components, increased operating noise, and reduced energy efficiency. Core components such as gears and bearings that are long-term exposed to the torsional vibration environment are prone to fretting wear or fracture, significantly shortening the equipment life. At the same time, the vibration energy is converted into structure-borne noise and transmitted to the cockpit through the vehicle body, seriously affecting the ride and drive comfort.

[0003] Traditional damping technologies rely on passive components (such as springs, hydraulic dampers, or rubber couplings). Although they can absorb vibration energy to a certain extent, their stiffness and damping parameters are fixed and cannot dynamically adapt to complex and changeable working conditions, especially when the engine runs at low or high speeds. This limitation makes it difficult for traditional solutions to meet the urgent needs of modern transmission systems for efficient damping, intelligent control, and compact layout. Summary of the Invention

[0004] The present invention aims to solve the torsional vibration problem caused by torque fluctuations between an engine and a transmission, and further improve the torsional damping effect and performance adjustability of the damper.

[0005] The present invention provides the following technical solution: A composite torsional damping device, comprising a first rotating part and a second rotating part;

[0006] The first rotating part includes a mass block and a damping body; the damping body is nested in the mass block, the damping body and the mass block are coaxial, and the circumference between the damping body and the mass block is connected by evenly distributed piezoelectric reed pieces; permanent magnets are arranged in an array on the mass block with the axis of the damping body as the center;

[0007] The second rotating part includes an annular electromagnetic coil, the annular electromagnetic coil is coaxial with the damping body, and the annular electromagnetic coil and the permanent magnets overlap in space;

[0008] A torque input connection part is arranged on the axis of the damping body, and a torque output connection part is arranged on the second rotating part; torque is transmitted between the first rotating part and the second rotating part through electromagnetic force.

[0009] Furthermore, the second rotating part further includes a housing, and the annular electromagnetic coil is fixed in the housing; the first rotating part is located in the housing, the first rotating part is axially limited and circumferentially free with respect to the housing, and a window is opened on the housing at the torque input connection part of the damping body.

[0010] Furthermore, radially penetrating inner grooves are formed on the circumference of the vibration damping body, radially penetrating outer grooves are formed on the inner circumference of the mass block, and both ends of the piezoelectric reed are respectively embedded in the outer groove and the inner groove; limiting blocks and cover plates are arranged on both sides of the outer groove on the mass block to limit the piezoelectric reed.

[0011] Furthermore, a friction reducing ring is arranged in the annular space between the vibration damping body and the mass block in the gap between the piezoelectric reeds. The friction reducing ring is in sliding contact with the vibration damping body and the mass block, and the friction reducing ring is fixed on the housing.

[0012] Furthermore, the piezoelectric reed includes reeds stacked in layers, and adjacent reeds are isolated by insulating gaskets; the reeds are divided into short reeds and long reeds, and the short reeds are distributed on both sides of the long reeds; one end of the short reed is embedded in the mass block, and the other end is within the range of the friction reducing ring, and the elastic force of the short reed acts on the friction reducing ring.

[0013] Furthermore, lateral ball bearings are lined between the two side walls of the outer groove of the mass block and the piezoelectric reed.

[0014] Furthermore, the housing includes a front end cover and a rear end cover. The annular electromagnetic coil is fixed on the rear end cover through a card seat, and the first rotating part is nested in the annular cavity of the front end cover.

[0015] Furthermore, the permanent magnet is inserted into the dovetail groove of the mass block, and the axial coincidence length of the permanent magnet and the annular electromagnetic coil is not less than 50% of the annular electromagnetic coil.

[0016] Furthermore, there are 6-pole permanent magnets on the mass block, and the magnetization directions of adjacent magnetic poles alternate.

[0017] Furthermore, the front end cover and the rear end cover are connected by bolts.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] A composite torsional vibration damping device provided by the present invention combines the active stiffness adjustment function of piezoelectric materials with the real-time controllability of electromagnetic damping, and realizes high-efficiency vibration damping under dynamic working conditions through mechanical structure optimization. Piezoelectric-electromagnetic collaborative control and structural integration optimization have a simple structure, novel and reasonable design, convenient implementation and low cost, high working stability in harsh environments, can greatly reduce the torsional vibration of the transmission system, have a large adjustable range of stiffness components, convenient control, can adjust the vibration damping performance in real time and dynamically under different working conditions, thereby improving the working performance of the transmission system, reducing the transmission noise, and having strong practicability and being convenient for popularization and use.

[0020] On the basis of the existing application of piezoelectric reeds, through the structural design of combining piezoelectric reeds of different lengths, the variable range of the stiffness of the piezoelectric reeds is further improved, and the stiffness adjustability of the device is improved.

[0021] The electromagnetic adjustable damper can achieve stepless adjustment of the damping force. By adjusting the magnitude of the current, it can adapt to various working conditions of the vehicle and significantly reduce the torsional vibration of the powertrain.

[0022] It has a compact structure, and the axial coincidence length of the permanent magnet and the annular electromagnetic coil is not less than 50% of the annular electromagnetic coil; it occupies a small overall axial space, solving the contradiction that an independent yoke and coil need to occupy a large axial space, otherwise a too low coincidence degree between the yoke and the coil will lead to a low effective damping rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the external structure diagram of the composite torsional vibration damper;

[0024] Figure 2 is the exploded view of the composite torsional vibration damper;

[0025] Figure 3 is the schematic diagram of the first rotating part;

[0026] Figure 4 is the schematic diagram of the second rotating part;

[0027] Figure 5 is the schematic diagram of the vibration damping body;

[0028] Figure 6 is the schematic diagram of the mass block;

[0029] Figure 7 is the schematic diagram of the piezoelectric reed;

[0030] Figure 8 is the schematic diagram of the position of the friction reduction ring.

[0031] In the figures: 1 - mass block; 1.1 - outer groove; 2 - piezoelectric reed; 2.1 - short reed; 2.2 - long reed; 3 - friction reduction ring; 4 - vibration damping body; 4.1 - inner groove; 4.2 - shaft hole; 5 - front end cover; 6 - rear end cover; 7 - permanent magnet array; 8 - annular electromagnetic coil; 9 - card seat; 10 - lateral roller; 11 - limit block; 12 - cover plate; 13 - dovetail groove; 14 - insulating gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Such as Figure 1 、 Figure 2 、 Figure 4As shown in the figure: A composite torsional vibration damping device includes a first rotating part and a second rotating part; the first rotating part includes a mass block 1 and a vibration damping body 4; the vibration damping body 4 is nested in the mass block 1, the vibration damping body 4 and the mass block 1 are coaxial, and the circumference between the vibration damping body 4 and the mass block 1 is connected by evenly distributed piezoelectric reeds 2; on the mass block 1, permanent magnets 7 are arranged in an array centered on the axis of the vibration damping body 4. The second rotating part includes an annular electromagnetic coil 8, the annular electromagnetic coil 8 is coaxial with the vibration damping body 4, and the annular electromagnetic coil 8 coincides with the permanent magnet 7 in space; when the permanent magnet 7 and the annular electromagnetic coil 8 rotate relative to each other, an electromagnetic damping force can be generated. A torque input connection part is arranged on the axis of the vibration damping body 4, and a torque output connection part is arranged on the second rotating part; torque is transmitted between the first rotating part and the second rotating part through electromagnetic force. Taking the composite torsional vibration damping device installed between the engine and the gearbox as an example, the torque output by the engine is input into the vibration damping body 4, the vibration damping body 4 transmits the torque to the mass block 1 through the elastically deformable piezoelectric reeds 2, and there is an electromagnetic damping force between the permanent magnet 7 on the mass block 1 and the annular electromagnetic coil 8. Therefore, when the mass block 1 rotates, it causes the annular electromagnetic coil 8 to rotate, and then the second rotating part that fixes the annular electromagnetic coil 8 rotates, and the second rotating part outputs the torque to the gearbox. When the engine has torque fluctuations, since a first "flexible" connection is formed between the vibration damping body 4 and the mass block 1, and a second "flexible" connection is formed between the mass block 1 and the annular electromagnetic coil 8, the two "flexible" connections act as a buffer, and the two "flexible" connections are superimposed to reduce the impact of the engine's torque fluctuations on the gearbox and keep the torque input to the gearbox stable.

[0034] The second rotating part further includes a housing, and the annular electromagnetic coil 8 is fixed inside the housing; the first rotating part is located inside the housing, the first rotating part is axially limited and circumferentially free with respect to the housing, and a window is opened on the housing at the torque input connection part of the vibration damping body 4. The output shaft of the engine enters the housing through the window on the housing and is connected to the vibration damping body 4, and the output shaft of the engine does not contact the housing; the housing is connected to the input shaft of the gearbox.

[0035] As Figure 3 、 Figure 5 、 Figure 6 As shown in the figure: Radially penetrating inner grooves 4.1 are opened on the circumference of the vibration damping body 4, and radially penetrating outer grooves 1.1 are opened on the inner circumference of the mass block 1. The two ends of the piezoelectric reed 2 are respectively embedded in the outer groove 1.1 and the inner groove 4.1, and the outer groove 1.1 and the inner groove 4.1 circumferentially limit the piezoelectric reed 2; on the mass block 1, limiting blocks 11 and cover plates 12 are arranged on both sides of the outer groove 1.1 to limit the piezoelectric reed 2; the limiting blocks 11 and the cover plates 12 axially limit the piezoelectric reed 2 to prevent the piezoelectric reed 2 from popping out.

[0036] As Figure 8As shown in the figure: A friction-reducing ring 3 is arranged in the annulus between the vibration damping body 4 and the mass block 1 in the gap between the piezoelectric reed 2. The friction-reducing ring 3 is in sliding contact with the vibration damping body 4 and the mass block 1, playing a role in reducing frictional losses. The friction-reducing ring 3 is fixed on the housing.

[0037] As Figure 7 shown in the figure: The piezoelectric reed 2 includes reeds stacked in layers. Adjacent reeds are isolated by insulating gaskets 14; the reeds are divided into short reeds 2.1 and long reeds 2.2, and the short reeds 2.1 are distributed on both sides of the long reeds 2.2; one end of the short reed 2.1 is embedded in the mass block 1, and the other end is within the range of the friction-reducing ring 3. The elastic force of the short reed 2.1 acts on the friction-reducing ring 3. The short reed 2.1 serves as a buffer between the long reed 2.2 and the friction-reducing ring 3, pressing both ends of the friction-reducing ring 3 to maintain a stable position and reserving a deformation space for the long reed 2.2.

[0038] Lateral balls 10 are lined between the two side walls of the outer groove 1.1 of the mass block 1 and the piezoelectric reed 2. The lateral balls 10 act as a buffer to prevent stress concentration between the piezoelectric reed 2 and the mass block 1.

[0039] The housing includes a front end cover 5 and a rear end cover 6, and the front end cover 5 and the rear end cover 6 are connected by bolts. The annular electromagnetic coil 8 is fixed on the rear end cover 6 through a card holder 9, and the first rotating part is nested in the annular cavity of the front end cover 5.

[0040] The permanent magnet 7 is inserted into the dovetail groove 13 of the mass block 1. The permanent magnet 7 is embedded in the dovetail groove 13 by interference fit, and the interference amount is 0.02 - 0.05 mm. The axial coincidence length of the permanent magnet 7 and the annular electromagnetic coil 8 is not less than 50% of the annular electromagnetic coil 8. The material of the permanent magnet 7 is neodymium iron boron or ferrite. There are a total of 6-pole permanent magnets 7 on the mass block 1, and the magnetization directions of adjacent magnetic poles alternate.

[0041] The annular electromagnetic coil 8 and the piezoelectric reed 2 are powered by two sets of slip rings. The stators of the slip rings are arranged separately outside the composite torsional vibration damping device. For example, the stator of the slip ring connected to the piezoelectric reed 2 is fixed on the housing of the engine, and the stator of the slip ring connected to the annular electromagnetic coil 8 is fixed on the housing of the gearbox. The terminal of the annular electromagnetic coil 8 extends out from the rear end cover 6 to make sliding contact with the stator of the slip ring, and the terminal of the piezoelectric reed 2 extends out from the front end cover 5 to make sliding contact with the stator of the slip ring. The voltage regulation range of the piezoelectric reed 2 is 0 - 200 V, and the stiffness change rate is 1.5 - 3 times the initial value; the current regulation range of the annular electromagnetic coil 8 is 0 - 5 A, and the damping force has a linear relationship with the current, and the damping force is proportional to the current.

[0042] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite torsional vibration damping device, characterized in that: It includes a first rotating part and a second rotating part; The first rotating part includes a mass block (1) and a vibration damping body (4); the vibration damping body (4) is nested in the mass block (1), the vibration damping body (4) and the mass block (1) are coaxial, and the circumference between the vibration damping body (4) and the mass block (1) is connected by evenly distributed piezoelectric reed pieces (2); on the mass block (1), permanent magnets (7) are arranged in an array centered on the axis of the vibration damping body (4); The second rotating part includes an annular electromagnetic coil (8), the annular electromagnetic coil (8) is coaxial with the vibration damping body (4), and the annular electromagnetic coil (8) and the permanent magnet (7) coincide in space; A torque input connection part is arranged on the axis of the vibration damping body (4), and a torque output connection part is arranged on the second rotating part; torque is transmitted between the first rotating part and the second rotating part through electromagnetic force.

2. The composite torsional vibration damping device according to claim 1, characterized in that: The second rotating part further includes a housing, and the annular electromagnetic coil (8) is fixed in the housing; the first rotating part is located in the housing, the first rotating part is axially limited and circumferentially free with respect to the housing, and a window is opened on the housing at the torque input connection part of the vibration damping body (4).

3. The composite torsional vibration damping device according to claim 2, characterized in that: Radially penetrating inner grooves (4.1) are opened on the circumference of the vibration damping body (4), and radially penetrating outer grooves (1.1) are opened on the inner circumference of the mass block (1). Both ends of the piezoelectric reed piece (2) are respectively inlaid in the outer groove (1.1) and the inner groove (4.1); on the mass block (1), a limiting block (11) and a cover plate (12) are arranged on both sides of the outer groove (1.1) to limit the piezoelectric reed piece (2).

4. The composite torsional vibration damping device according to claim 3, wherein: A friction reducing ring (3) is arranged in the annular space between the vibration damping body (4) and the mass block (1) in the gap between the piezoelectric reed pieces (2). The friction reducing ring (3) is in sliding contact with the vibration damping body (4) and the mass block (1), and the friction reducing ring (3) is fixed on the housing.

5. The composite torsional vibration damping device according to claim 4, characterized in that: The piezoelectric reed piece (2) includes laminated reed pieces, and adjacent reed pieces are isolated by insulating gaskets (14); the reed pieces are divided into short reed pieces (2.1) and long reed pieces (2.2), and the short reed pieces (2.1) are distributed on both sides of the long reed pieces (2.2); one end of the short reed piece (2.1) is inlaid on the mass block (1), and the other end is within the range of the friction reducing ring (3), and the elastic force of the short reed piece (2.1) acts on the friction reducing ring (3).

6. A composite torsional vibration damping device according to any one of claims 3 to 5, characterized in that: Lateral balls (10) are lined between the two side groove walls of the outer groove (1.1) of the mass block (1) and the piezoelectric reed piece (2).

7. A composite torsional vibration damping device according to claim 2, characterized in that: The housing includes a front end cover (5) and a rear end cover (6), the annular electromagnetic coil (8) is fixed on the rear end cover (6) through a clamping seat (9), and the first rotating part is nested in the annular cavity of the front end cover (5).

8. A composite torsional vibration damping device according to claim 1, characterized in that: The permanent magnet (7) is inserted into the dovetail groove (13) of the mass block (1), and the axial coincidence length of the permanent magnet (7) and the annular electromagnetic coil (8) is not less than 50% of the annular electromagnetic coil (8).

9. A composite torsional vibration damping device according to claim 8, characterized in that: There are 6-pole permanent magnets (7) on the mass block (1), and the magnetization directions of adjacent magnetic poles change alternately.

10. The composite torsional vibration damping device according to claim 7, characterized in that: The front end cover (5) and the rear end cover (6) are connected by bolts.

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