CN115306866A

CN115306866A - Flexible flywheel and preparation method thereof

Info

Publication number: CN115306866A
Application number: CN202211057171.9A
Authority: CN
Inventors: 李玲娟; 徐亚飞; 周俊; 周君; 张德定
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2022-11-08

Abstract

The application provides a flexible flywheel, relate to engine technical field, flexible flywheel is used for connecting torque converter and engine crankshaft, flexible flywheel is including the cyclic annular arch towards torque converter, set up between a plurality of boss connecting holes and a plurality of crankshaft connecting hole, the cyclic annular interval of a plurality of boss connecting holes sets up the position that is close to the outer fringe at flexible flywheel, the cyclic annular interval of a plurality of crankshaft connecting holes sets up the position that is close to central authorities at flexible flywheel, cyclic annular arch can promote flexible flywheel's intensity, and need not to set up combination formula flywheel, the preparation is lower with the assembly degree of difficulty.

Description

Flexible flywheel and preparation method thereof

Technical Field

The application relates to the technical field of automobile engines, in particular to a flexible flywheel and a preparation method thereof.

Background

Currently, with the application of automatic transmissions, the power output of the engine is transmitted to the transmission through a torque converter that uses transmission oil to transmit speed and torque, so that a flywheel that is mated to the torque converter no longer needs the function of storing rotational inertia, but only a relatively light flexible flywheel is required to act as a coupling.

In the actual operation process, the gearbox oil in the torque converter transmits torque in the form of oil pressure filling, the gearbox oil generates centrifugal oil pressure simultaneously due to high-speed rotation, parts also generate centrifugal force, and the loads are transmitted to the flexible flywheel through the connecting boss, so that the flexible flywheel generates large axial deformation. When an engine with high power and large torque is matched with an automatic gearbox and is matched with a hydraulic torque converter with larger size, the diameter of the flexible flywheel is often larger, the thickness of the flexible flywheel is thinner, the structural rigidity is weaker, and the axial deformation and stress can hardly meet the requirements.

In order to improve the rigidity of the flexible flywheel, a combined flexible flywheel is generally adopted in the prior art, and the flexible disk is divided into a signal disk and a flexible plate which are connected together through rivets. However, such a combined flywheel is complicated to assemble and is relatively expensive.

Disclosure of Invention

In view of this, the present application provides a flexible flywheel, which has a low manufacturing cost, a simple assembly, and a high strength.

In one aspect, an embodiment of the present application provides a flexible flywheel, where the flexible flywheel is used to connect a torque converter and an engine crankshaft, and a wheel surface of the flexible flywheel is provided with a plurality of boss connection holes, a plurality of crankshaft connection holes, and an annular protrusion.

The plurality of boss connecting holes are arranged in a ring shape at intervals and are used for being connected with a plurality of connecting bosses which are used for connecting the flexible flywheel and the outer edge of the hydraulic torque converter.

The plurality of crankshaft connecting holes are arranged in a ring shape at intervals and used for being connected with a crankshaft of the engine.

The annular projection projects toward the torque converter.

The plurality of boss connecting holes are closer to the outer edge of the flexible flywheel relative to the plurality of crankshaft connecting holes, and the annular bulge is positioned between the plurality of boss connecting holes and the plurality of crankshaft connecting holes.

Alternatively, the portion of the flexible flywheel other than the annular projection is formed with a step shape from the center toward the outer edge in the radial direction of the flexible flywheel, and gradually approaches the torque converter.

Alternatively, the height of the annular protrusion is less than a preset thickness threshold, which is determined based on a minimum value of a distance difference between the torque converter and the engine crankshaft, so that the annular protrusion is not in contact with the torque converter.

Optionally, the annular protrusion is further provided with a plurality of stress relief holes, and the plurality of stress relief holes are arranged in an annular shape at intervals.

Alternatively, the annular projection includes a flat portion and a curved portion, and the plurality of stress relief holes are provided on the flat portion.

Alternatively, the target positions and target shapes of the plurality of stress relief holes are predetermined based on a charge oil pressure, a centrifugal force, and a torque of the torque converter, wherein the determination includes:

and substituting the charging oil pressure, the centrifugal force and the torque into the simulation calculation model as known parameters.

And substituting the positions and the shapes of the multiple groups of stress-relief holes into the simulation calculation model.

And obtaining a plurality of groups of stress values and deformation quantities corresponding to the positions and the shapes of the stress-relief holes by utilizing the simulation calculation model.

And determining the positions and shapes of the stress-relief holes corresponding to the stress values and the deformation amounts smaller than the preset threshold value as target positions and target shapes of the stress-relief holes.

Optionally, the center of the flexible flywheel is further provided with a through hole for passing a portion connecting the torque converter and the engine crankshaft.

Optionally, the edge of the flexible flywheel is further provided with a gear ring for connecting the starter.

On the other hand, the embodiment of the application also provides a transmission device, which comprises a flexible flywheel, a hydraulic torque converter, an engine crankshaft and a connecting boss, wherein the flexible flywheel is used for connecting the hydraulic torque converter and the engine crankshaft, and the wheel surface of the flexible flywheel is provided with a plurality of boss connecting holes, a plurality of crankshaft connecting holes and an annular bulge.

The plurality of boss coupling holes are arranged in a ring shape at intervals for coupling with a plurality of coupling bosses which couple the flexible flywheel and an outer periphery of the torque converter.

The annular projection projects toward the torque converter.

The plurality of boss connecting holes are closer to the outer edge of the flexible flywheel than the plurality of crankshaft connecting holes, and the annular bulge is located between the plurality of boss connecting holes and the plurality of crankshaft connecting holes.

Optionally, the transmission further comprises a bolt, wherein:

the bolts comprise a plurality of first bolts, the first bolts are used for penetrating through the boss connecting holes and connecting and fixing one ends of the connecting bosses and the flexible flywheel, and the other ends of the connecting bosses are connected with the shell of the hydraulic torque converter.

The bolts further comprise a plurality of second bolts, and the second bolts are used for penetrating through the crankshaft connecting holes and connecting and fixing the engine crankshaft and the flexible flywheel.

Adopt the flexible flywheel that this application embodiment provided for connect torque converter and engine crankshaft, flexible flywheel includes the cyclic annular arch towards torque converter, set up between a plurality of boss connecting holes and a plurality of crankshaft connecting hole, the cyclic annular interval of a plurality of boss connecting holes sets up the position that is close to the outer fringe at flexible flywheel, the cyclic annular interval of a plurality of crankshaft connecting holes sets up the position that is close to central authorities at flexible flywheel, cyclic annular arch can promote flexible flywheel's intensity, and need not to set up combination formula flywheel, preparation and assembly degree of difficulty are lower.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic top view of a flexible flywheel according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional structure diagram of a transmission device provided in an embodiment of the present application.

The reference numerals in the figures are respectively:

1-a flexible flywheel;

101-boss connection hole;

102-crankshaft connecting hole;

1021-a location hole;

103-annular protrusion;

1031-curved surface portion;

1032-a planar portion;

104-a stress relief hole;

105-a via;

2-a hydraulic torque converter;

3-an engine crankshaft;

4-boss;

5-a gear ring;

6-bolt;

601-a first bolt;

602-second bolt.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

At present, along with the increase of car holdings, the traffic congestion condition in city is more serious, and automatic transmission is because its hands are easy, easy operation, and can not flameout hardly, begins to receive more and more driver favor. Most of the fuel oil vehicles sold on the market AT present are provided with automatic gearboxes, and the traditional AT automatic gearbox runs most smoothly and reliably in all the automatic gearboxes. For a conventional AT automatic transmission, a torque converter is the most important mechanism, replacing the clutch of a manual transmission. In an automatic transmission equipped with a hydraulic torque converter, the power output of an engine is transmitted to the transmission through the hydraulic torque converter, the hydraulic torque converter transmits the rotating speed and the torque by using transmission oil, and the vibration can be effectively eliminated in the transmission process, so that a flywheel matched with the hydraulic torque converter does not need the function of storing rotational inertia any more, only a light connecting functional piece is needed for connecting a shell of the hydraulic torque converter and a crankshaft of the engine, and the connecting functional piece is a flexible disk, also called a flexible flywheel.

In the actual operation process, the gearbox oil in the torque converter transmits torque in the form of oil pressure filling, centrifugal oil pressure is generated by the gearbox oil simultaneously due to high-speed rotation of the torque converter, centrifugal force is generated by all parts, and the centrifugal load is transmitted to the flexible flywheel to enable the flexible flywheel to generate large flexible deformation.

When the automatic gearbox is matched with a high-power and high-torque engine, the diameter of the flexible flywheel is often larger in order to match the shape of a crankshaft of the engine, and the thickness of the flexible flywheel is often thinner (the thickness is 2-3 mm) in order to make the arrangement of an engine compartment more compact and improve the weight distribution of a vehicle, so that the rigidity of a connecting structure of the flexible flywheel between the crankshaft of the engine and a hydraulic torque converter is weaker. At the same time, however, the load transmitted by the torque converter to the flexible flywheel increases accordingly. In order to improve the rigidity of the flexible flywheel, a combined flexible flywheel is often adopted, and the flexible flywheel is divided into two parts, namely a signal panel and a flexible plate, which are connected together through rivets. The flexible flywheel has high rigidity and good strength, but has larger requirement on the size of an axial space, complex assembly and higher cost.

The flexible flywheel provided by the embodiment of the application increases the rigidity of the flexible flywheel by increasing the folding height, determines the position and the shape of the stress hole by means of Computer Aided Engineering (CAE), and provides the corresponding stress relief hole on the flexible flywheel, so that a single flexible flywheel structure meeting the requirements on rigidity and strength can be obtained. Compared with a combined flexible disk, the structure is simpler, the weight is lighter, the cost is lower, and the assembly is more convenient.

Specifically, the present embodiment provides a flexible flywheel 1, as shown in fig. 1, the flexible flywheel 1 is used for connecting a torque converter 2 and an engine crankshaft 3 (as shown in fig. 2), and a plurality of boss connecting holes 101, a plurality of crankshaft connecting holes 102 and an annular protrusion 103 are provided on a wheel surface of the flexible flywheel 1.

It will be understood that the torque converter 2 in fig. 2 is of the gearbox type, the engine crankshaft 3 is of the engine type, and the flexible flywheel 1 acts as a coupling connecting the torque converter 2 of the gearbox and the engine crankshaft 3 of the engine.

The plurality of boss coupling holes 101 are arranged in a ring shape at intervals from each other, as shown in fig. 1. And the boss attachment holes 101 are adapted to be attached to a plurality of attachment bosses 4 that attach the flexible flywheel 1 to the outer periphery of the torque converter 2.

It can be understood that the connecting boss 4 is used for connecting the outer edge of the shell of the hydraulic torque converter 2 and the flexible flywheel 1, so that the rotation of the shell of the hydraulic torque converter 2 and the rotation of the flexible flywheel 1 are linked with each other, the rotation of the shell of the hydraulic torque converter 2 can drive the flexible flywheel 1 to rotate, and the rotation of the flexible flywheel 1 can also drive the shell of the hydraulic torque converter 2 to rotate.

A plurality of crankshaft connecting holes 102 are arranged in a ring shape at intervals for connecting with the crankshaft 3 of the engine

Specifically, the number of boss coupling holes 101 may be 6, and the number of crankshaft coupling holes 102 may be 8.

As shown in fig. 1, a positioning hole 1021 may be further provided between any two adjacent crankshaft connecting holes 102 among the plurality of crankshaft connecting holes 102, for matching with a positioning pin provided on the engine crankshaft, so that the flexible flywheel 1 can be correctly mounted on the engine crankshaft 3.

It can be understood that the flexible flywheel 1 near the center can be connected to the engine crankshaft 3 by the crankshaft connecting hole 102 and the connecting member passing through the crankshaft connecting hole 102, so that the rotation of the engine crankshaft 3 and the flexible flywheel 1 are linked, and the rotation of the engine crankshaft 3 can drive the flexible flywheel 1 to rotate.

Since the crankshaft connecting hole 102 for establishing connection between the engine crankshaft 3 and the flexible flywheel 1 is located near the center of the flexible flywheel 1, and the boss connecting hole 101 for establishing connection between the housing of the torque converter 2 and the flexible flywheel 1 is located near the edge of the flexible flywheel 1, the process of transmission between the engine crankshaft 3 and the torque converter 2 by means of the flexible flywheel 1 tends to cause internal stress and flexible deformation of the flexible flywheel, and if the flexible flywheel 1 is not rigid enough, the internal stress and the flexible deformation are hard to bear, and irreversible damage is caused.

Based on the shape of the flexible flywheel 1, in order to enhance the rigidity of the flexible flywheel 1, the technical solution of the embodiment of the present application selects to provide an annular protrusion on the flexible flywheel 1, and the annular protrusion 103 protrudes toward the torque converter 2.

It can be understood that, when the flexible flywheel 1 is manufactured, a stamping process may be used to fold an annular protrusion 103 protruding toward the torque converter 2 on the flexible flywheel 1, where the circle centers of the annular protrusion 103 and the flexible flywheel 1 are the same.

It is understood that although the annular protrusion 103 can improve the rigidity of the flexible flywheel 1 and enhance the resistance to flexible deformation, the height of the annular protrusion 103 cannot be too high, so as to avoid interference with the torque converter 2 and affect the service life of the components. Therefore, the height of the annular projection 103 is smaller than a preset thickness threshold value, which is determined based on the minimum value of the distance difference between the torque converter 2 and the engine crankshaft 3, so that the annular projection 103 is not in contact with the torque converter 2.

Further, since different materials may have different stamping process difficulties, when the height of the annular protrusion 103 is too high, the stamping process difficulty may be large, and the cost is high. Therefore, the height of the annular protrusion 103 can also be determined according to the material of the flexible flywheel 1, so that the height of the annular protrusion is smaller than the preset height threshold.

As shown in fig. 1, wherein the plurality of boss attachment holes 101 are located closer to the outer edge of the flexible flywheel 1 than the plurality of crankshaft attachment holes 102, the annular projection 103 is located between the plurality of boss attachment holes 101 and the plurality of crankshaft attachment holes 102.

It is understood that, before the annular protrusion 103 is formed on the flexible flywheel 1 by the punching process, because there is a certain distance difference between the engine crankshaft 3 and the edge of the outer shell of the torque converter 2, the flexible flywheel 1 is generally subjected to the punching process a plurality of times in advance, so that the portion of the flexible flywheel 1 other than the annular protrusion 103 is formed with a step shape from the center toward the outer edge along the radial direction of the flexible flywheel 1, and gradually approaches the torque converter 2. After such a punching process, the center of the flexible flywheel 1 is closer to the engine crankshaft 3, and the edge is closer to the torque converter 2, thereby facilitating the connection between the torque converter 2, the flexible flywheel 1, and the engine crankshaft 3 while increasing the rigidity of the flexible flywheel 1.

Similarly, since different materials may have different difficulty in performing the stamping process, when the hardness of the material is high, the step-like difficulty in performing the stamping process on the flexible flywheel 1 is high. The number of punching processes performed in advance on the flexible flywheel 1 before forming the annular protrusion 103 on the flexible flywheel 1 using the punching process, and the height difference of each step of the stepped shape resulting from the punching, can be predetermined according to the material of the flexible flywheel 1.

And the rigidity of the flexible flywheel 1 is also affected by the number of folding, therefore, in some alternative embodiments, before the annular protrusion 103 is formed on the flexible flywheel 1 by using the stamping process, the flexible flywheel 1 may be subjected to the stamping process twice in advance, so that the flexible flywheel 1 except for the annular protrusion 103 is formed with a two-step shape from the center to the outer edge along the radial direction of the flexible flywheel 1.

Since the annular projection 103 is for improving the rigidity of the flexible flywheel 1, the height of the annular projection 103 is higher than the above-described overall height of the step-like shape that is punched before the annular projection 103 is formed.

It can be understood that the annular protrusion 103 provided on the flexible flywheel 1 can improve the rigidity of the flexible flywheel 1, and further, when the flexible flywheel 1 has a relatively strong integrity, the internal stress acting on the flexible flywheel 1 can cause the flexible flywheel 1 to deform as a whole, so that the flexible flywheel 1 is irreversibly damaged.

Therefore, in some alternative embodiments, a plurality of stress relief holes 104 may also be disposed on the annular protrusion 103, and the plurality of stress relief holes 104 are arranged in an annular shape at intervals.

When the annular protrusion 103 on the flexible flywheel 1 is provided with the plurality of stress relief holes 104, the internal stress acting on the flexible flywheel 1 is preferentially decomposed by the plurality of stress relief holes 104, so that the stress value near the connecting position of the flexible flywheel 1 and the torque converter 2 is transferred, and only the plurality of stress relief holes 104 are deformed, so that the deformation of the flexible flywheel 1 except the plurality of stress relief holes 104 is smaller, the overall shape of the flexible flywheel 1 is ensured not to be greatly changed, and the durability of the flexible flywheel 1 is improved.

It is to be understood that, as shown in fig. 1, when the annular protrusion 103 is formed by a punching process, the annular protrusion 103 may include a curved portion 1031 at the fold, and a flat portion 1032 between the fold portions, the flat portion 1032 being closer to the torque converter 2 than other portions on the flexible flywheel 1.

In order to reduce manufacturing difficulties, improve workpiece regularity and ensure overall rigidity of the flexible flywheel 1, in some alternative embodiments, the stress relief holes 104 are disposed on the planar portion 1031, rather than the curved portion 1031.

It is understood that, since the main stress and deformation amount of the flexible flywheel 1 is caused by the charging oil pressure, centrifugal force and torque of the torque converter, and the position and shape of the stress relief hole 104 directly affect the capability of the stress relief hole to relieve the main stress and deformation amount of the flexible flywheel 1, in order to maximize the function of the stress relief hole 104, in some alternative embodiments, the target position and target shape of the stress relief holes 104 are predetermined according to the charging oil pressure, centrifugal force and torque of the torque converter.

The determination mode comprises the following steps:

the charging oil pressure, the centrifugal force and the torque are used as known parameters to be substituted into a simulation calculation model, wherein the simulation calculation model can be a simulation calculation model stored in Computer Aided Engineering (CAE).

And obtaining a plurality of groups of stress values and deformation quantities corresponding to the positions and the shapes of the stress relief holes by using the simulation calculation model.

In some alternative embodiments, a simulation calculation model may be used to derive four sets of stress values and deformation quantities corresponding to the positions and shapes of the four sets of stress relief holes.

The preset threshold value can be set according to the material and size of the flexible flywheel 1 and the power and torque of the engine, so that the flexible flywheel 1 can keep a stable shape, cannot deform greatly, and can bear the power and torque output by the engine.

In some alternative embodiments, as shown in fig. 1, the center of the flexible flywheel 1 is further provided with a through hole 105 for passing a central portion of the engine crankshaft 3 for positioning, the central position of the engine crankshaft 3 is further provided with a positioning groove facing one side of the torque converter 2, the center of the housing of the torque converter 2 is further provided with a plug facing the engine crankshaft 3, and the plug is inserted into the positioning groove in the center of the engine crankshaft 3 for positioning as well.

In some alternative embodiments, the edge of the flexible flywheel 1 is also provided with a ring gear 5 for connecting a starter. When the engine is started, the starter generates a starting rotating speed, and the gear ring 5 drives the flexible flywheel 1 to rotate, so that the engine crankshaft 3 is driven to rotate, and the engine is driven to start.

Adopt flexible flywheel 1 that this application embodiment provided for connect torque converter 2 and engine crankshaft 3, flexible flywheel 1 includes the annular protrusion 103 towards torque converter 2, set up between a plurality of boss connecting holes 101 and a plurality of crankshaft connecting hole 102, the annular interval of a plurality of boss connecting holes 101 sets up the position that is close to the outer fringe at flexible flywheel 1, the annular interval of a plurality of crankshaft connecting holes 102 sets up the position that is close to central authorities at flexible flywheel 1, annular protrusion 103 can promote the intensity of flexible flywheel 1, and need not to set up the combination formula flywheel, preparation and assembly degree of difficulty are lower.

The embodiment of the present application further provides a transmission device, as shown in fig. 2, including a flexible flywheel 1, a torque converter 2, an engine crankshaft 3, and a connecting boss 4, where the flexible flywheel 1 is used to connect the torque converter 2 and the engine crankshaft 3, and a wheel surface of the flexible flywheel 1 is provided with a plurality of boss connecting holes 101, a plurality of crankshaft connecting holes 102, and an annular protrusion 103.

The plurality of boss coupling holes 101 are arranged in a ring shape at intervals from each other for coupling with a plurality of coupling bosses 4 that couple the flexible flywheel 1 and the outer periphery of the torque converter 2.

The plurality of crankshaft connecting holes 102 are arranged in a ring shape at intervals for connection with the engine crankshaft 3.

The annular projection 103 projects toward the torque converter 2.

Wherein the plurality of boss attachment holes 101 are closer to the outer edge of the flexible flywheel 1 than the plurality of crankshaft attachment holes 102, and the annular projection 103 is located between the plurality of boss attachment holes 101 and the plurality of crankshaft attachment holes 102.

As shown in fig. 1, a positioning hole 1021 may be further provided between any two adjacent crankshaft connecting holes 102 of the plurality of crankshaft connecting holes 102 for matching with a positioning pin provided on the engine crankshaft 3, so that the flexible flywheel 1 can be correctly mounted on the engine crankshaft 3.

It can be understood that the connection boss 4 is used for connecting the flywheel 1 and the torque converter 2, and the connection boss 4 has a cylindrical shape with a certain height, so that the connection boss 4 can be used for adjusting the distance between the flywheel 1 and the torque converter 2.

In alternative embodiments, the height of the connection boss 4 may be predetermined to optimize the axial matching distance between the torque converter 2 and the engine crankshaft 3 to be within a suitable range to provide space for the stamped annular protrusion 103.

In some alternative embodiments, as shown in fig. 2, the transmission further comprises a bolt 6, wherein:

the bolts 6 include a plurality of first bolts 601, the plurality of first bolts 601 are used for passing through the plurality of boss connection holes 101 and connecting and fixing one ends of the plurality of connection bosses 4 and the flexible flywheel 1, and the other ends of the plurality of connection bosses 4 are connected with the housing of the torque converter 2.

The bolts 6 further include a plurality of second bolts 602, and the plurality of second bolts 602 are used to pass through the plurality of crankshaft connecting holes 102 and to fixedly connect the engine crankshaft 3 and the flexible flywheel 1.

It is understood that, when the flexible flywheel 1 is manufactured, a stamping process can be used to fold an annular protrusion 103 protruding toward the torque converter 2 on the flexible flywheel 1, and the center of the annular protrusion 103 is the same as that of the flexible flywheel 1.

It is understood that, before the annular protrusion 103 is formed on the flexible flywheel 1 by the punching process, because there is a certain distance difference between the engine crankshaft 3 and the edge of the outer shell of the torque converter 2, the flexible flywheel 1 is generally subjected to the punching process a plurality of times in advance, so that the portion of the flexible flywheel 1 except the annular protrusion 103 is formed with a step shape from the center toward the outer edge along the radial direction of the flexible flywheel 1, and gradually approaches the torque converter 2. After such a punching process, the center of the flexible flywheel 1 is closer to the engine crankshaft 3, and the edge is closer to the torque converter 2, thereby facilitating the connection between the torque converter 2, the flexible flywheel 1, and the engine crankshaft 3 while increasing the rigidity of the flexible flywheel 1.

Similarly, since different materials may have different difficulty in performing the stamping process, when the hardness of the material is high, the step-like difficulty in performing the stamping process on the flexible flywheel 1 is high. Therefore, the number of times of the punching process performed in advance on the flexible flywheel 1 before the annular protrusion 103 is formed on the flexible flywheel 1 by the punching process, and the height difference of each step of the stepped shape generated by the punching process can be predetermined according to the material of the flexible flywheel 1.

And the rigidity of the flexible flywheel 1 is also affected by too many folding times, therefore, in some alternative embodiments, before the annular protrusion 103 is formed on the flexible flywheel 1 by using the stamping process, the flexible flywheel 1 may be subjected to the stamping process twice in advance, so that the portion of the flexible flywheel 1 except for the annular protrusion 103 is formed with a two-step shape from the center to the outer edge along the radial direction of the flexible flywheel 1.

Since the annular projection 103 is for improving the rigidity of the flexible flywheel 1, the height of the annular projection 103 is higher than the above-described overall height of the step-like shape produced by punching before forming the annular projection 103.

It is understood that, as shown in fig. 1, when the annular protrusion 103 is formed by a punching process, the annular protrusion 103 may include a curved portion 1031 at the fold, and a flat portion 1032 between the fold portions, the flat portion 1032 being closer to the torque converter 2 than other portions on the flexible flywheel 1.

The determination mode comprises the following steps:

the charging oil pressure, the centrifugal force, and the torque are used as known parameters to be substituted into a simulation calculation model, wherein the simulation calculation model may be a simulation calculation model stored in Computer Aided Engineering (CAE).

The preset threshold value can be set according to the material and size of the flexible flywheel 1 and the power and torque of the engine, so that the flexible flywheel 1 can keep a stable shape without large deformation and can bear the power and torque output by the engine.

By adopting the transmission device provided by the embodiment of the application, the flexible flywheel 1 is used for connecting the hydraulic torque converter 2 and the engine crankshaft 3, the flexible flywheel 1 comprises the annular bulge 103 facing the hydraulic torque converter 2, the annular bulge is arranged between the plurality of boss connecting holes 101 and the plurality of crankshaft connecting holes 102, the plurality of boss connecting holes 101 are arranged at the positions, close to the outer edge, of the flexible flywheel 1 at intervals, the plurality of crankshaft connecting holes 102 are arranged at the positions, close to the center, of the flexible flywheel 1 at intervals, the annular bulge 103 can improve the strength of the flexible flywheel 1, a combined flywheel does not need to be arranged, and the preparation and assembly difficulty is lower.

The embodiment of the application also provides a vehicle which comprises the transmission device provided by the previous embodiment.

In the present application, it is to be understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible flywheel (1), characterized by that, the said flexible flywheel (1) is used for connecting the torque converter (2) and engine crankshaft (3), the wheel surface of the said flexible flywheel (1) has multiple boss attachment holes (101), multiple crankshaft attachment holes (102) and cyclic bulge (103);

the boss connecting holes (101) are arranged in a ring shape at intervals and are used for being connected with a plurality of connecting bosses (4) which are used for connecting the flexible flywheel (1) and the outer edge of the hydraulic torque converter (2);

the plurality of crankshaft connecting holes (102) are arranged in a ring shape at intervals and are used for being connected with the engine crankshaft (3);

the annular projection (103) projects toward the torque converter (2),

wherein the plurality of boss connecting holes (101) are closer to the outer edge of the flexible flywheel (1) than the plurality of crankshaft connecting holes (102), and the annular protrusion (103) is located between the plurality of boss connecting holes (101) and the plurality of crankshaft connecting holes (102).

2. The flexible flywheel (1) according to claim 1, characterized in that a portion of the flexible flywheel (1) other than the annular projection (103) is formed with a step shape from a center toward an outer edge in a radial direction of the flexible flywheel (1) and gradually approaches the torque converter (2).

3. A flexible flywheel (1) according to claim 2, characterized in that the height of the annular projection (103) is smaller than a preset thickness threshold value, which is determined according to the minimum value of the difference in distance between the torque converter (2) and the engine crankshaft (3), so that the annular projection (103) is not in contact with the torque converter (2).

4. A flexible flywheel (1) according to claim 1, characterized in that said annular projection (103) is further provided with a plurality of stress relief holes (104), said plurality of stress relief holes (104) being arranged in a ring shape spaced from each other.

5. A flexible flywheel (1) according to claim 4, characterized in that said annular protrusion (103) comprises a planar portion (1031) and a curved portion (1032), said plurality of stress relief holes (104) being provided on said planar portion (1031).

6. A flexible flywheel (1) according to claim 4, characterized in that the target positions and the target shapes of said plurality of stress relief holes (104) are predetermined according to the charge oil pressure, the centrifugal force, the torque of said hydrodynamic torque converter, wherein the determination comprises:

substituting the charging oil pressure, the centrifugal force and the torque into a simulation calculation model as known parameters;

substituting the positions and the shapes of the stress relief holes into the simulation calculation model;

obtaining a plurality of groups of stress values and deformation quantities corresponding to the positions and the shapes of the stress-relief holes by using the simulation calculation model;

determining the positions and shapes of the stress-relieved holes corresponding to the stress values and deformation amounts smaller than a preset threshold value as the target positions and the target shapes of the plurality of stress-relieved holes.

7. A flexible flywheel (1) according to claim 1, characterized in that the flexible flywheel (1) is also provided with a through hole (105) in the centre for passing the portion of the torque converter (2) connected to the engine crankshaft (3).

8. A flexible flywheel (1) according to claim 1, characterized in that the edge of the flexible flywheel (1) is also provided with a ring gear (5) for connection to a starter.

9. A transmission device is characterized by comprising a flexible flywheel (1), a hydraulic torque converter (2), an engine crankshaft (3) and a connecting boss (4), wherein the flexible flywheel (1) is used for connecting the hydraulic torque converter (2) and the engine crankshaft (3), and the wheel surface of the flexible flywheel (1) is provided with a plurality of boss connecting holes (101), a plurality of crankshaft connecting holes (102) and an annular bulge (103);

the annular projection (103) projects toward the torque converter (2),

10. Transmission according to claim 9, characterized in that it further comprises a bolt (6), wherein:

the bolts (6) comprise a plurality of first bolts (601), the first bolts (601) are used for penetrating through the boss connecting holes (101) and connecting and fixing one ends of the connecting bosses (4) and the flexible flywheel (1), and the other ends of the connecting bosses (4) are connected with a shell of the hydraulic torque converter (2);

the bolt (6) further comprises a plurality of second bolts (602), and the plurality of second bolts (602) are used for penetrating through the plurality of crankshaft connecting holes (102) and connecting and fixing the engine crankshaft (3) and the flexible flywheel (1).