Novel disc type assembly for connecting crankshaft and transmission mechanism

Abstract

The invention relates to the technical field of automobile parts, in particular to a novel disc assembly for connecting a crankshaft and a transmission mechanism, which comprises a flexible disc assembly used for being connected with an engine crankshaft; the inertia ring assembly is located on the side wall of the flexible disc assembly, and the inertia ring assembly and the flexible disc assembly are connected through a connecting assembly; and the locking assembly is arranged on the inertia ring assembly, and the locking assembly is used for locking the inertia ring assembly and a transmission mechanism. The rotational inertia of the disc assembly is reduced, and the axial vibration excitation of the engine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to a novel disc assembly for connecting a crankshaft and a transmission mechanism. Background Art

[0002] The disc assembly, also known as the engine flywheel, is an important connecting component between the engine and the transmission system. It is not only a connecting component between the engine and the transmission system, but also plays a key role in energy storage, speed balance, power transmission, engine starting, and reducing vibration and noise.

[0003] In hybrid models, the inertia requirement of the transmission system is relatively reduced, but the requirements for vehicle weight reduction are increasing. Traditional cast iron flywheels are heavy, have low material utilization, are difficult to process, and have a high scrap rate. In addition, traditional flywheels cannot effectively solve the axial vibration caused by engine operation, which not only generates corresponding noise, but also brings extremely high fatigue risks. Hybrid engines are in a high-speed state for a long time, and the engine's axial vibration frequency is higher and more times. Traditional cast iron flywheels have high stiffness and low fatigue strength, making it difficult to cope with such high-risk fatigue conditions.

[0004] Therefore, those skilled in the art are committed to developing a new disc assembly connecting the crankshaft and the transmission mechanism, reducing the rotational inertia of the disc assembly and reducing the axial vibration excitation of the engine. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a new disc assembly connecting a crankshaft and a transmission mechanism, thereby reducing the rotational inertia of the disc assembly and lowering the axial vibration excitation of the engine.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A new disc assembly for connecting a crankshaft and a transmission mechanism, comprising

[0008] a flexplate assembly for connection with an engine crankshaft;

[0009] An inertia ring assembly, wherein the inertia ring assembly is located on a side wall of the flexible disk assembly, and the inertia ring assembly and the flexible disk assembly are connected via a connecting assembly;

[0010] A locking assembly is arranged on the inertia ring assembly, and is used to lock the inertia ring assembly with the transmission mechanism.

[0011] The beneficial effects of adopting the above scheme are: by arranging the inertia ring assembly on the side wall of the flexible disc assembly and adopting a specific connection method, compared with the traditional flywheel, the new disc assembly can effectively reduce the overall rotational inertia (the rotational inertia can be reduced by 20% compared with the traditional cast iron flywheel), making it more suitable for the hybrid vehicle model's relatively reduced inertia requirement, and helping to improve the response speed and efficiency of the transmission system;

[0012] The split design of the flex plate assembly and the inertia ring assembly, as well as the optimized connection assembly, significantly reduces the overall mass compared to the traditional cast iron flywheel while ensuring functionality, which helps meet the requirements of hybrid vehicle weight reduction (the overall mass can be reduced by 10%), thereby improving fuel economy and vehicle performance;

[0013] The structure of the new disc assembly allows for more rational use of materials and reduced material waste during the manufacturing process. At the same time, its processing technology is relatively simplified, which reduces the processing difficulty, improves the processing efficiency, and thus reduces the production cost;

[0014] The flexible disc assembly has a certain degree of flexibility and can buffer the axial vibration generated by the engine operation. The inertia ring assembly can absorb and disperse the vibration energy to a certain extent, thereby effectively reducing the axial vibration excitation of the engine. This not only reduces the noise caused by vibration, relieves shaft fatigue, and enhances the normal NVH performance of the vehicle, but also reduces the fatigue risk caused by vibration and increases the service life of the flywheel.

[0015] By optimizing the structural design and material selection, especially when the hybrid engine runs at high speed for a long time and the axial vibration frequency is higher and more times, it can better cope with high-risk fatigue conditions and ensure the reliability and stability of the flywheel under complex conditions.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the outer edge of the inertia ring assembly has a plurality of positioning pins arranged at intervals, and the plurality of positioning pins are arranged along the circumference of the inertia ring assembly and are arranged perpendicular to the inertia ring assembly.

[0018] The beneficial effect of adopting the above further scheme is that multiple positioning pins are arranged along the circumference and set perpendicular to the inertia ring assembly, which can ensure that the inertia ring assembly is positioned more accurately during installation, avoid vibration and noise problems caused by installation deviation, and thus improve the operating stability of the entire disc assembly.

[0019] Furthermore, the flexible disk assembly includes a flexible disk having a center hole, a connecting hole on the flexible disk and located outside the center hole, and a plurality of weight-reducing holes arranged along a circumference on the flexible disk and located outside the connecting hole.

[0020] The beneficial effects of adopting the above further solution are: the multiple weight-reducing holes can effectively reduce the overall mass of the disc assembly, reduce the moment of inertia, and further meet the lightweight requirements of hybrid vehicles, while not affecting the overall structural strength and function of the disc assembly;

[0021] The flexible disk has a certain flexibility due to its thin wall. When the engine generates axial impact and causes vibration, such flexibility can reduce such vibration and dissipate it into the external space in the form of heat.

[0022] The center hole and the connection holes provide a reliable structural basis for the connection between the flexible disk and the engine crankshaft and other components, ensuring that the disk assembly can stably transmit power during operation and reducing failures caused by loose connections.

[0023] Furthermore, the flexible disk is made of high-strength fine-grain steel, and the axial stiffness of the flexible disk is 10^6N / m to 10^8N / m, and the thickness of the flexible disk is 1.5mm to 3.5mm.

[0024] The beneficial effect of adopting the above further scheme is that the flexible disk made of high-strength fine-grain steel has high strength and toughness, and can maintain good performance under high speed and high vibration conditions. At the same time, the appropriate axial stiffness range (10^6N / m to 10^8N / m) can effectively buffer the axial vibration of the engine, reduce vibration transmission, and reduce noise and fatigue risks.

[0025] Further, the inertia ring assembly includes a first inertia ring and a second inertia ring, the thickness of the first inertia ring is smaller than the thickness of the second inertia ring, the outer wall of the first inertia ring is connected to the second inertia ring, the second inertia ring is provided with a first boss and a second boss, the first boss and the second boss are arranged alternately, and the positioning pin is arranged on the first boss.

[0026] The beneficial effect of adopting the above further solution is that the connection structure between the first inertia ring and the second inertia ring, and the positioning pin arranged on the first boss, enhance the overall structural stability of the inertia ring assembly, so that it can remain stable when running at high speed, and reduce vibration and deformation.

[0027] Furthermore, the first inertia circular ring and the second inertia circular ring are both made of cast iron.

[0028] The beneficial effect of adopting the above further scheme is that the high strength and high stiffness characteristics of the cast iron material can ensure that the inertia ring assembly maintains stable performance during long-term use, reduce damage caused by material fatigue, and improve the reliability and service life of the disc assembly.

[0029] Furthermore, the inner diameter R of the first inertia ring is 内 The outer diameter R of the second inertia ring 外 The ratio is

[0030]

[0031] Where X is the mass reduced by the second inertia ring;

[0032] Y is the reduced inertia of the disc assembly.

[0033] The beneficial effect of adopting the above further scheme is that the setting of this ratio provides a clear parameter basis for the design of the disc assembly, which helps to accurately control the mass and inertia in the design stage, avoid insufficient performance or over-design due to unreasonable design, and thus improve the overall performance and economy of the disc assembly.

[0034] Furthermore, the connecting assembly includes a first connecting hole arranged on the second inertia ring and a second connecting hole arranged on the flexible disk, and a connecting screw passes through the second connecting hole and the first connecting hole to connect the second inertia ring and the flexible disk.

[0035] The beneficial effects of adopting the above further solution are: the screw connection is easy to install and disassemble, improves the convenience of repair and replacement, and reduces maintenance costs. At the same time, the tightness of the screw connection can be adjusted as needed, further improving the stability and reliability of the disc assembly.

[0036] Furthermore, the outer surface of the second inertia ring is provided with a wear-resistant coating, the thickness of the wear-resistant coating is 0.1 mm to 0.5 mm, and the material of the wear-resistant coating is tungsten carbide or ceramic.

[0037] The beneficial effect of adopting the above further solution is that the thickness of the wear-resistant coating is between 0.1 mm and 0.5 mm, which can ensure sufficient wear resistance without increasing too much cost. By reducing wear, the frequency of failures caused by wear is reduced, thereby reducing maintenance costs and improving the economy and practicality of the disc assembly.

[0038] Furthermore, a shock-absorbing pad is arranged between the flexible disc assembly and the inertia ring assembly, and the shock-absorbing pad is made of rubber or polyurethane material.

[0039] The beneficial effect of adopting the above further scheme is that the shock-absorbing pad is made of rubber or polyurethane material, which has good elasticity, durability and fatigue resistance, can maintain a stable shock-absorbing effect during long-term use, reduce fatigue damage caused by vibration, and improve the overall service life of the disc assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of a novel disc assembly structure for connecting a crankshaft and a transmission mechanism in a specific embodiment of the present invention;

[0041] Figure 2 It is a schematic side view of a novel disc assembly connecting a crankshaft and a transmission mechanism in a specific embodiment of the present invention;

[0042] Figure 3 It is a schematic diagram of the exploded structure of a novel disc assembly connecting a crankshaft and a transmission mechanism according to a specific embodiment of the present invention.

[0043] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0044] 1. Flexible disk assembly; 2. Inertia ring assembly; 3. Connecting assembly; 4. Positioning pin; 5. Flexible disk; 6. Center hole; 7. Connecting hole; 8. Weight reduction hole; 9. First inertia ring; 10. Second inertia ring; 11. First boss; 12. Second boss; 13. First connecting hole; 14. Connecting screw. DETAILED DESCRIPTION

[0045] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0046] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, a novel disc assembly for connecting a crankshaft and a transmission mechanism comprises a flexible disc assembly 1, wherein the flexible disc assembly 1 is used to connect with the engine crankshaft;

[0050] An inertia ring assembly 2, the inertia ring assembly 2 is located on the side wall of the flexible disk assembly 1, and the inertia ring assembly 2 and the flexible disk assembly 1 are connected via a connecting assembly 3;

[0051] The locking assembly is arranged on the inertia ring assembly 2, and is used to lock the inertia ring assembly 2 with the transmission mechanism, so that the power output from the engine crankshaft is transmitted to the transmission mechanism through the flexible disk assembly 1 and the inertia ring assembly 2 in sequence to complete the power output.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the outer edge of the inertia ring assembly 2 has a plurality of spaced positioning pins 4, the plurality of positioning pins 4 are arranged along the circumference of the inertia ring assembly 2 and are disposed perpendicular to the inertia ring assembly 2. In this embodiment, three positioning pins 4 are disposed, and the angle between two adjacent positioning pins is 120°.

[0053] In order to reduce the axial vibration of the disc assembly, a shock-absorbing pad is arranged between the flexible disc assembly 1 and the inertia ring assembly 2. The shock-absorbing pad can be made of rubber or polyurethane material with a thickness of 0.3mm to 3mm. The flexible disc assembly 1 includes a flexible disc 5, which is made of high-strength fine-grained steel, and the axial stiffness of the flexible disc 5 is 10^6N / m to 10^8N / m, and the thickness of the flexible disc 5 is 1.5mm to 3.5mm. The flexible disc 5 has a center hole 6, which is used to fix and position with the engine crankshaft. The flexible disc 5 is provided with a connecting hole 7 located outside the center hole 6. The connecting screw passes through the connecting hole and is connected to the engine crankshaft. The flexible disc 5 is provided with a plurality of weight-reducing holes 8 arranged along the circumference and located outside the connecting hole 7. The weight-reducing holes 8 arranged along the circumference reduce the mass of the flexible disc 5 without reducing the stiffness and strength of the flexible disc 5, thereby reducing the rotational inertia of the flexible disc 5.

[0054] like Figure 1 , Figure 2 and Figure 3 As shown, in another embodiment, the inertia ring assembly 2 includes a first inertia ring 9 and a second inertia ring 10, both of which are made of cast iron, the thickness of the first inertia ring 9 is less than the thickness of the second inertia ring 10, the outer wall of the first inertia ring 9 is connected to the second inertia ring 10, the second inertia ring 10 is provided with a first boss 11 and a second boss 12, the width of the first boss 11 is less than the width of the second boss 12, the first boss 11 and the second boss 12 are staggered, and two second bosses 12 are provided between two adjacent first bosses 11, the positioning pin 4 is provided on the first boss 11, and the inner diameter R of the first inertia ring 9 is 内 The outer diameter R of the second inertia ring 10 外 The ratio is

[0055]

[0056] Where X is the mass reduced by the second inertia ring;

[0057] Y is the reduced inertia of the disc assembly.

[0058] like Figure 3 As shown, in the embodiment, the connecting assembly 3 includes a first connecting hole 13 provided on the second inertia ring 10 and a second connecting hole provided on the flexible disk 5 , and a connecting screw 14 passes through the second connecting hole and the first connecting hole 13 to connect the second inertia ring 10 and the flexible disk 5 .

[0059] The outer surface of the second inertia ring 10 is provided with a wear-resistant coating, the thickness of the wear-resistant coating is 0.1 mm to 0.5 mm, and the material of the wear-resistant coating is tungsten carbide or ceramic, which increases the wear resistance of the second inertia ring 10 .

[0060] A method for preparing a novel disc assembly for connecting a crankshaft and a transmission mechanism comprises the following steps:

[0061] S100. The flexible disc raw material is placed into a stamping die for stamping;

[0062] S200. The flexible disk formed by stamping in step S100 is placed in a heating device and heated to 850°C to 950°C, and maintained for 30 minutes to 60 minutes;

[0063] S300. Put the flexible disk after heat preservation in step S200 into cold oil for quenching;

[0064] S400. After heating the cast iron raw material to 1450°C to 1500°C to form a molten raw material, the molten raw material is poured into the inertia disk assembly mold and cooled at room temperature;

[0065] S500. Grinding, cleaning and drilling the inertia disk assembly cast in step S400 to form an inertia disk assembly;

[0066] S600. Combine the inertia disc assembly prepared in step S500 and the flexible disc prepared in step S300 to form a new disc assembly.

[0067] Wherein, step S600 further includes adding a shock-absorbing pad between the bypass disk and the inertia disk assembly when the two are combined.

[0068] After step S400, the process further includes providing a carbide wear-resistant layer on the surface of the inertia disc assembly, including

[0069] S410. Sandblast the surface of the inertia disk assembly to remove oxide scale and impurities and increase surface roughness;

[0070] S420.Use supersonic velocity flame spraying (HVOF) or plasma spraying technology to mix tungsten carbide powder (tungsten carbide powder particle size is generally 5μmˉ15μm) with metal binder (such as Co, Ni) and spray it onto the surface of the inertia disc assembly. The coating thickness is generally 0.5mmˉ2mm;

[0071] S430. After spraying, the casting is heat treated at a temperature of 800°C to 1000°C for 12 hours to improve the bonding strength between the coating and the substrate.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel disc assembly for connecting a crankshaft and a transmission mechanism, characterized in that: It comprises a flexible disc assembly (1), wherein the flexible disc assembly (1) is used to be connected to an engine crankshaft; An inertia ring assembly (2), the inertia ring assembly (2) being located on a side wall of the flexible disk assembly (1), and the inertia ring assembly (2) and the flexible disk assembly (1) being connected via a connecting assembly (3); A locking assembly, wherein the locking assembly is arranged on the inertia ring assembly (2), and the locking assembly is used to lock the inertia ring assembly (2) with the transmission mechanism.

2. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 1 is characterized in that: The outer edge of the inertia ring assembly (2) has a plurality of positioning pins (4) arranged at intervals, and the plurality of positioning pins (4) are arranged along the circumference of the inertia ring assembly (2) and are arranged perpendicular to the inertia ring assembly (2).

3. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 2 is characterized in that: The flexible disk assembly (1) comprises a flexible disk (5), wherein the flexible disk (5) has a center hole (6), a connecting hole (7) is provided on the flexible disk (5) and is located outside the center hole (6), and a plurality of weight-reducing holes (8) are provided on the flexible disk (5) and are located outside the connecting hole (7) and are arranged along a circumference.

4. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 3 is characterized in that: The flexible disk (5) is made of high-strength fine-grained steel, and the axial rigidity of the flexible disk (5) is 10^6 N / m to 10^8 N / m, and the thickness of the flexible disk (5) is 1.5 mm to 3.5 mm.

5. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 3 is characterized in that: The inertia ring assembly (2) comprises a first inertia circular ring (9) and a second inertia circular ring (10); the thickness of the first inertia circular ring (9) is smaller than the thickness of the second inertia circular ring (10); the outer wall of the first inertia circular ring (9) is connected to the second inertia circular ring (10); the second inertia circular ring (10) is provided with a first boss (11) and a second boss (12); the first boss (11) and the second boss (12) are arranged alternately; and the positioning pin (4) is arranged on the first boss (11).

6. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 5 is characterized in that: The first inertia circular ring (9) and the second inertia circular ring (10) are both made of cast iron.

7. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 5 is characterized in that: The inner diameter R of the first inertia ring (9) is 内 and the outer diameter R of the second inertia ring (10) 外 The ratio is Where X is the mass reduced by the second inertia ring; Y is the reduced inertia of the disc assembly.

8. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 5 is characterized in that: The connecting assembly (3) comprises a first connecting hole (13) arranged on the second inertia ring (10) and a second connecting hole arranged on the flexible disk (5), and a connecting screw (14) passes through the second connecting hole and the first connecting hole (13) to connect the second inertia ring (10) and the flexible disk (5).

9. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 5 is characterized in that: The outer surface of the second inertia ring (10) is provided with a wear-resistant coating, the thickness of the wear-resistant coating is 0.1 mm to 0.5 mm, and the material of the wear-resistant coating is tungsten carbide or ceramic.

10. The novel disc assembly for connecting a crankshaft and a transmission mechanism according to claim 1 is characterized in that: A shock-absorbing pad is arranged between the flexible disc assembly (1) and the inertia ring assembly (2), and the shock-absorbing pad is made of rubber or polyurethane material.

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