Torsional vibration damper and power transmission device

Abstract

The present invention belongs to the field of engine technology and discloses a torsional vibration damper and a power transmission device, wherein the torsional vibration damper includes an outer transmission pin, an inner transmission pin, a transmission belt and a spring seat, a plurality of outer transmission pins are arranged on the outer periphery of the same number of inner transmission pins, a plurality of inner transmission pins are arranged along the same circumference, the transmission belt is a closed serpentine structure and connects the outer transmission pins and the inner transmission pins, a pair of spring seats are provided on the radial inner side of each outer transmission pin, each pair of spring seats is elastically connected by an elastic member, and the transmission belt is engaged with each outer transmission pin and each spring seat. The power transmission device includes a first flywheel, a second flywheel and the above-mentioned torsional vibration damper. Beneficial effects: The torsional vibration damper has a nonlinear and progressive torsional vibration damping stiffness and a good vibration damping effect; the multiple contact positions of the transmission belt are subject to meshing action, and meshing tooth slippage is not likely to occur, thereby improving the structural stability and service life of the moving parts of the torsional vibration damper.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a torsional vibration damper and a power transmission device. Background Art

[0002] Due to the combustion detonation of the engine, the output shaft will inevitably experience torsional vibration during rotation. This torsional vibration is harmful to the powertrain and also causes vibration and noise. To reduce this torsional vibration, a torsional vibration damper is added between the engine output shaft and the transmission input shaft.

[0003] For example, Chinese invention patent CN201910222964.3 discloses a dual-mass flywheel in which the torsional vibration damper includes a transmission belt, a transmission pin, a spring and a spring seat. When the flywheel rotates at high speed, the spring, the spring seat and the transmission belt itself generate huge centrifugal force. This centrifugal force will cause slippage between the spring and the transmission belt, and between the transmission belt and the transmission pin, thereby reducing the structural stability of the moving parts of the torsional vibration damper and seriously affecting the life of the dual-mass flywheel. Summary of the Invention

[0004] The object of the present invention is to provide a torsional vibration damper and a power transmission device to solve the problem of slippage between the spring of the torsional vibration damper and the transmission belt, and between the transmission belt and the transmission pin when the power transmission device rotates at high speed.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a torsional vibration damper, comprising an outer transmission pin, an inner transmission pin, a transmission belt, and a spring seat, wherein a plurality of the outer transmission pins are arranged on the outer periphery of the same number of the inner transmission pins, and a plurality of the inner transmission pins are arranged along the same circumference, the transmission belt is in a closed serpentine structure and connects the outer transmission pins and the inner transmission pins, and a pair of the spring seats are provided on the radial inner side of each outer transmission pin, wherein:

[0007] Each pair of spring seats is elastically connected via an elastic member, and the transmission belt is engaged with each of the outer transmission pins and each of the spring seats.

[0008] The transmission belt is engaged with the spring seat and the outer transmission pin respectively, so that multiple contact positions of the transmission belt are subjected to meshing action, and it is not easy for the meshing teeth to slip, thereby improving the structural stability between the spring seat and the transmission belt.

[0009] As a preferred solution of the above-mentioned torsional vibration damper, it further includes a stopping claw, a plurality of the inner transmission pins are arranged around the outer periphery of the stopping claw, and the stopping claw is engaged with the transmission belt.

[0010] The stop pawl engages with the drive belt to prevent the drive belt from sliding on the inner drive pin, thereby improving the structural stability between the inner drive pin and the drive belt.

[0011] As a preferred solution of the above-mentioned torsional vibration damper, a clamp is provided on the mutually facing sides of each pair of the spring seats, the clamp is clamped with the spring seats, and the transmission belt is clamped between the clamp and the spring seats.

[0012] By arranging the clamp, the transmission belt is clamped between the clamp and the spring seat, further preventing abnormal slippage between the spring seat and the transmission belt.

[0013] As a preferred solution of the above-mentioned torsional vibration damper, the end surface of the spring seat along the Z-axis direction is provided with a boss, and the clamp is provided with a hook that cooperates with the boss.

[0014] A boss is provided on the end face of the spring seat in the Z-axis direction so as not to affect the transmission of the transmission belt. At the same time, the clamp and the spring seat are clamped together through the boss and the hook, which is convenient for installation and disassembly.

[0015] As a preferred embodiment of the above-mentioned torsional vibration damper, in a pair of the spring seats, one of the spring seats is provided with a guide column along the extension and contraction direction of the elastic member, and the other spring seat is provided with a guide sleeve along the extension and contraction direction of the elastic member, the guide column is slidably arranged in the guide sleeve, and the elastic member is sleeved on the outside of the guide column and the guide sleeve.

[0016] The two spring seats can prevent the elastic member from bending when it expands and contracts through the guiding effect of the guide column and the guide sleeve.

[0017] As a preferred solution of the above-mentioned torsional vibration damper, the elastic member is a spring.

[0018] The present invention also provides a power transmission device, including the above-mentioned torsional vibration damper, and also including a first flywheel and a second flywheel, the first flywheel serving as one of the power output end and the power input end, the second flywheel serving as the other of the power output end and the power input end, the outer transmission pin being arranged on one of the first flywheel and the second flywheel, and the inner transmission pin being arranged on the other of the first flywheel and the second flywheel.

[0019] As a preferred solution of the above-mentioned power transmission device, the axis of the first flywheel or the second flywheel is provided with a spline for outputting power.

[0020] As a preferred solution of the above-mentioned power transmission device, the spline and the stopping claw are provided as an integral structure.

[0021] Beneficial effects of the present invention:

[0022] For the torsional vibration damper, the transmission belt is engaged with the spring seat and the external transmission pin respectively, so that multiple contact positions of the transmission belt are subjected to meshing action, and it is not easy for the meshing teeth to slip, thereby improving the structural stability between the spring seat and the transmission belt.

[0023] For a power transmission device, the use of the torsional vibration damper can increase the service life of the power transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a power transmission device according to a first embodiment of the present invention;

[0025] Figure 2 The present invention Figure 1 An axial cross-sectional view of the power transmission device shown;

[0026] Figure 3 is an exploded view of a partial structure of the torsional vibration damper of the present invention;

[0027] Figure 4 is a schematic diagram of the installation structure of the first flywheel;

[0028] Figure 5 This is a schematic diagram of the structure of the first flywheel with an internal transmission pin;

[0029] Figure 6 This is a schematic diagram of the structure of the second flywheel (omitted the bracket) with an external transmission pin;

[0030] Figure 7 It is a schematic structural diagram of a power transmission device according to a second embodiment of the present invention.

[0031] In the picture:

[0032] 1-First flywheel;

[0033] 2-second flywheel; 21-saddle; 22-flange; 23-spline;

[0034] 31-external transmission pin; 32-inner transmission pin; 33-transmission pin engagement groove; 34-stop claw; 341-claw engagement groove; 35-rivet;

[0035] 4- transmission belt; 41- meshing teeth; 42- tension wire core;

[0036] 5-spring seat; 51-spring seat engagement groove; 52-boss; 53-clamp; 531-hook; 54-guide column; 55-guide sleeve;

[0037] 6-spring;

[0038] 7-engine crankshaft; 71-mounting bolt DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0040] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0043] Example 1

[0044] like Figures 1 to 6As shown, the present invention provides a torsional vibration damper and a power transmission device, comprising a first flywheel 1, a second flywheel 2, and a torsional vibration damper. The first flywheel 1 and the second flywheel 2 are coaxially arranged along the Z-axis. In this embodiment, the first flywheel 1 is located above the second flywheel 2. The torsional vibration damper comprises outer drive pins 31, inner drive pins 32, a transmission belt 4, and a spring seat 5. The outer drive pins 31 and inner drive pins 32 are identical in number. The outer drive pins 31 are arranged at equal angular intervals on the edge of the second flywheel 2, while the inner drive pins 32 are arranged at equal angular intervals at the center of the first flywheel 1, i.e., the outer drive pins 31 are arranged around the outer circumference of the inner drive pins 32. The transmission belt 4 has a closed serpentine structure and is sequentially connected to each outer drive pin 31 and each inner drive pin 32. A pair of spring seats 5 are provided radially inwardly of each outer drive pin 31. Each pair of spring seats 5 is elastically connected by an elastic member. The transmission belt 4 engages with each outer drive pin 31 and each spring seat 5.

[0045] It should be noted that, in order to conveniently display the first flywheel 1 and the second flywheel 2, part of the structure of the first flywheel in the figure is cut away. In fact, the first flywheel 1 is disc-shaped.

[0046] like Figure 1 and Figure 2 A catch 21 is provided on the edge of the second flywheel 2, and the transmission belt 4 is clamped between the outer transmission pin 31 and the catch 21 to prevent the transmission belt 4 and the outer transmission pin 31 from slipping abnormally.

[0047] Combine Figure 2 、 Figure 5 and Figure 6 The first flywheel 1 and the second flywheel 2 can be cast, and the casting method can be selected from cast iron casting, pressure casting, etc. The first flywheel 1 serves as the power input end, and the second flywheel 2 serves as the power output end. The center of the second flywheel 2 is stamped to form a flange 22. The flange 22 is tubular, and the inner cylindrical surface of the flange 22 is provided with a spline 23. The power transmission device transmits torque outward through the spline 23.

[0048] Of course, the first flywheel 1 and the second flywheel 2 may also be stamped parts, but the present invention is not limited thereto.

[0049] See also Figure 4 The inner transmission pin 32 is hollow, and the mounting bolt 71 passes through the inner transmission pin 32 to press and fix the inner transmission pin 32 and the first flywheel 1 on the engine crankshaft 7. The engine crankshaft 7 is the torque input end of the power transmission device.

[0050] like Figure 2 As shown, the outer transmission pin 31 is arranged on the end surface of the second flywheel 2 facing the first flywheel 1, and the inner transmission pin 32 is arranged on the end surface of the first flywheel 1 facing the second flywheel 2. In this embodiment, the outer transmission pin 31 is connected to the second flywheel 2 by a rivet 35.

[0051] Further, see Figure 3 A tension wire core 42 is provided inside the transmission belt 4. The transmission belt 4 is subjected to tension along the length direction of the tension wire core 42, and the transmission belt 4 can be flexibly bent in the direction not subjected to tension.

[0052] like Figure 1 In this embodiment, there are six inner transmission pins 32 and six outer transmission pins 31, all spaced equidistantly at 60° intervals. A pair of spring seats 5 are located radially inwardly of each outer transmission pin 31. This means that the transmission belt 4 is stretched apart by the inner transmission pins 32, outer transmission pins 31, and two spring seats 5, forming six diamond-shaped structures. In other words, the entire power transmission device features six torsional vibration dampers, which share the transmission torque.

[0053] In this embodiment, the transmission belt 4 simultaneously engages with the outer transmission pin 31, the stop pawl 34, and the two spring seats 5. When the flywheel rotates at high speed, the transmission belt 4 engages with the spring seats 5, the stop pawl 34, and the outer transmission pin 31. For a single torsional vibration damper, all four contact points of the transmission belt 4 are engaged, making it less likely that the meshing teeth 41 will slip. This improves the structural stability of the spring seats 5, the outer transmission pin 31, the inner transmission pin 32, and the transmission belt 4, thereby increasing the service life of the power transmission device.

[0054] In this embodiment, the transmission belt 4 is slidingly connected to the inner transmission pin 32, and the torsional vibration damper also includes a stopping claw 34, which is engaged with the transmission belt 4. In this embodiment, the stopping claw 34 is arranged at the center of the first flywheel 1, and the transmission belt 4 is clamped between the inner transmission pin 32 and the stopping claw 34.

[0055] The inner side of the transmission belt 4 is provided with meshing teeth 41 extending along the Z axis. The outer side of the spring seat 5 is provided with a spring seat meshing groove 51 extending along the Z axis. The outer transmission pin 31 is provided with a transmission pin meshing groove 33 extending along the Z axis. The meshing teeth 41 are capable of meshing with the spring seat meshing groove 51 and the transmission pin meshing groove 33. In this embodiment, the locking pawl 34 is provided with a pawl meshing groove 341, which meshes with the meshing teeth 41 of the transmission belt 4.

[0056] In this embodiment, the inner transmission pin 32 and the transmission belt 4 are set to be in sliding connection, that is, the transmission pin engagement groove 33 is not set on the inner transmission pin 32, which reduces the processing technology of the inner transmission pin 32. At the same time, a stopping claw 34 is set on the axis of the first flywheel 1, so that the transmission belt 4 will not slip abnormally on the inner transmission pin 32.

[0057] It should be noted that the inner transmission pin 32 is provided with a sliding connection with the transmission belt 4 because the conventional transmission belt 4 has teeth on only one side and a flat surface on the other side, so the stop pawl 34 is required. Of course, if a special transmission belt with double-sided teeth is used, the inner transmission pin 32 can also be made to engage the transmission belt 4 in the same way as the outer transmission pin 31, thereby eliminating the stop pawl 34.

[0058] Continue to see Figure 3 In a single torsional vibration damper, a clamp 53 is provided on the sides of each pair of spring seats 5 facing away from each other. The clamp 53 is engaged with the spring seats 5, and the transmission belt 4 is clamped between the clamp 53 and the spring seats 5. The provision of the clamp 53 clamps the transmission belt 4 between the clamp 53 and the spring seats 5, further preventing abnormal slippage between the spring seats 5 and the transmission belt 4.

[0059] The spring seat 5 has a boss 52 on its end surface along the Z-axis. In this embodiment, both ends of the spring seat 5 along the Z-axis are provided with bosses 52, and the clamp 53 is provided with a hook 531 that engages with the boss 52. Providing the boss 52 on the end surface of the spring seat 5 along the Z-axis does not affect the transmission of the transmission belt 4. Furthermore, the clamp 53 and the spring seat 5 are connected by the boss 52 and the hook 531, facilitating installation and removal.

[0060] Furthermore, a spring 6 is provided between the two spring seats 5. Figure 3 The spring seat 5 on the left side is provided with a guide post 54 along the expansion and contraction direction of the spring 6. Figure 3 The spring seat 5 on the right side of the center is equipped with a guide sleeve 55 along the direction of spring 6's expansion and contraction. A guide post 54 slides within the guide sleeve 55, and the spring 6 is sheathed outside the guide post 54 and the guide sleeve 55. The spring seat 5 is elastically connected by the spring 6, enabling expansion and contraction in a direction perpendicular to the radial direction of the first flywheel 1. The two spring seats 5 are guided by the guide post 54 and the guide sleeve 55, preventing the spring 6 from bending during expansion and contraction.

[0061] Example 2

[0062] See also Figure 7 The present invention provides another power transmission device, which differs from the first embodiment in that an outer transmission pin 31 is provided on the first flywheel 1 as the power input end, an inner transmission pin 32 is provided on the second flywheel 2 as the power output end, and a stop pawl 34 is provided at the center of the second flywheel 2. The inner circumference of the stop pawl 34 is provided with a spline 23. In this case, the spline 23 and the stop pawl 34 are provided as an integral structure.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A torsional vibration damper comprising an outer transmission pin (31), an inner transmission pin (32), a transmission belt (4) and a spring seat (5), characterized in that: A plurality of the outer transmission pins (31) are arranged on the outer periphery of the same number of the inner transmission pins (32), and a plurality of the inner transmission pins (32) are arranged along the same circumference. The transmission belt (4) is in a closed serpentine structure and connects each of the outer transmission pins (31) and the inner transmission pins (32). A pair of the spring seats (5) is provided on the radial inner side of each of the outer transmission pins (31). The number of the inner transmission pins (32) and the outer transmission pins (31) is the same. The transmission belt (4) is stretched by the inner transmission pins (32), the outer transmission pins (31) and the spring seats (5) to form a diamond structure, wherein: Each pair of the spring seats (5) is elastically connected via an elastic member, and the transmission belt (4) is engaged with each of the outer transmission pins (31) and each of the spring seats (5); A stopping claw (34), a plurality of the inner transmission pins (32) are arranged around the outer periphery of the stopping claw (34), and the stopping claw (34) is engaged with the transmission belt (4).

2. The torsional vibration damper according to claim 1, characterized in that Each pair of mutually facing sides of the spring seats (5) is provided with a clamp (53), the clamp (53) is clamped with the spring seats (5), and the transmission belt (4) is clamped between the clamp (53) and the spring seats (5).

3. The torsional vibration damper according to claim 2, characterized in that The spring seat (5) is provided with a boss (52) on its end surface along the Z-axis direction, and the clamp (53) is provided with a hook (531) that cooperates with the boss (52).

4. The torsional vibration damper according to claim 3, characterized in that In a pair of the spring seats (5), one of the spring seats (5) is provided with a guide column (54) along the expansion and contraction direction of the elastic member, and the other spring seat (5) is provided with a guide sleeve (55) along the expansion and contraction direction of the elastic member, the guide column (54) is slidably arranged in the guide sleeve (55), and the elastic member is sleeved on the outside of the guide column (54) and the guide sleeve (55).

5. The torsional vibration damper according to claim 4, characterized in that The elastic member is a spring (6).

6. A power transmission device, characterized in that: The torsional vibration damper comprises a torsional vibration damper as claimed in any one of claims 2 to 5, further comprising a first flywheel (1) and a second flywheel (2), wherein the first flywheel (1) serves as one of a power output end and a power input end, and the second flywheel (2) serves as the other of the power output end and the power input end, the outer transmission pin (31) is provided in one of the first flywheel (1) and the second flywheel (2), and the inner transmission pin (32) is provided in the other of the first flywheel (1) and the second flywheel (2).

7. The power transmission device according to claim 6, characterized in that: The axis of the first flywheel (1) or the second flywheel (2) is provided with a spline (23) for outputting power.

8. The power transmission device according to claim 7, characterized in that: The spline (23) and the stop claw (34) are provided as an integral structure.

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