Sectional type cover plate structure, flywheel assembly and torque damper

Abstract

The utility model discloses a sectional type cover plate structure, a flywheel assembly and a torque damper, and relates to the technical field of automobile transmission, and the sectional type cover plate structure comprises multiple sections of cover plate sheets; and the plurality of sections of cover plate sheets are circumferentially distributed at intervals and are respectively provided with cover plate rivet holes. A traditional integral upper cover plate is changed into a sectional type cover plate structure composed of a plurality of sections of cover plate pieces distributed at intervals in the circumferential direction, compared with the integral upper cover plate design, the material utilization rate during part stamping is increased, the production cost is reduced, meanwhile, the weight of the upper cover plate is effectively reduced, and light weight is achieved.

Description

Technical Field

[0001] This application relates to the field of automotive transmission technology, and in particular to a segmented cover structure, a flywheel assembly, and a torque damper. Background Technology

[0002] Torque dampers play a crucial role in automotive powertrain systems, especially in hybrid vehicles. In the power transmission system of hybrid vehicles, the power generated by the engine needs to be smoothly transmitted to the generator via torque dampers. This process requires the torque damper not only to effectively transmit power but also to suppress potential torque fluctuations and vibrations to ensure the generator can operate stably and efficiently.

[0003] Currently, most torsion dampers widely used in the automotive industry employ a relatively traditional assembly method. Specifically, they mainly rely on riveting the upper and lower cover plates together to assemble the entire damper into a complete component. This riveting structure has proven to have a certain degree of stability and reliability in long-term practice, and can meet basic functional requirements.

[0004] However, with the automotive industry's increasing demands for energy conservation and emission reduction, vehicle lightweighting has become an undeniable development trend. Against this backdrop, traditional riveted torque dampers have revealed significant limitations. Due to the inherent characteristics of this structural design, it faces challenges in weight reduction and is difficult to optimize for weight reduction.

[0005] Therefore, in the current stage of rapid development of hybrid vehicles, the issue of lightweighting torsion dampers urgently needs to be addressed. Utility Model Content

[0006] In view of this, the purpose of this application is to provide a segmented cover plate structure, a flywheel assembly, and a torque damper to improve the material utilization rate during part stamping and achieve lightweighting.

[0007] To achieve the above technical objectives, this application provides a segmented cover plate structure, including multiple cover plate segments;

[0008] The multiple cover plates are distributed circumferentially at intervals, and each has a cover plate rivet hole.

[0009] Furthermore, each section of the cover plate has a downward-facing flange on its outer edge.

[0010] Furthermore, each of the cover plates mentioned above includes a first plate, a second plate, and a connecting plate;

[0011] The first plate and the second plate are parallel to each other and spaced apart in their own thickness direction;

[0012] The connecting plate is connected between the outer edge of the first plate and the inner edge of the second plate;

[0013] The rivet holes of the cover plate are opened in the second plate.

[0014] This application also discloses a flywheel assembly, including a flywheel body and the segmented cover plate structure described above;

[0015] The flywheel body is provided with flywheel rivet holes that correspond one-to-one with the rivet holes of the segmented cover plate structure.

[0016] The flywheel body and the segmented cover plate structure are riveted together by a first rivet.

[0017] This application also discloses a torque damper, including a driven disc, a clamping pad, a clamping elastic element, a flexible disc assembly, and the aforementioned flywheel assembly;

[0018] The driven disc is centrally mounted on the side of the flywheel body of the flywheel assembly facing the segmented cover plate structure;

[0019] The clamping pad is installed on the driven plate and is located between the driven plate and the segmented cover plate structure;

[0020] The clamping elastic element is installed between the clamping pad and the segmented cover plate structure, and is clamped to the clamping pad by the clamping action of the segmented cover plate structure.

[0021] The flexible disk assembly is installed on the other side of the flywheel body, opposite to the segmented cover structure.

[0022] Furthermore, the driven disc includes a face riveting assembly, a first clamping plate, a second clamping plate, a third clamping plate, a vibration damping elastic assembly, a damping disc, a disc hub, a first driven elastic element, a second driven elastic element, and a clamping disc;

[0023] The first clamping plate is fastened to the face riveting assembly;

[0024] The face riveting assembly is provided with an elastic mounting window for inserting the vibration damping elastic assembly;

[0025] The damping disc is installed on the side of the first clamping plate facing the segmented cover structure;

[0026] The hub is mounted on the damping disc, and its external teeth mesh with the internal teeth in the middle of the damping disc.

[0027] The first driven elastic element is mounted on the second clamping plate;

[0028] The second clamping plate is fastened to the clamping plate;

[0029] The outer teeth of the third clamping plate are aligned with the inner teeth of the clamping disc and are mounted on the disc hub;

[0030] The second driven elastic element is mounted on the third clamping plate;

[0031] The clamping disc is riveted to the face riveting assembly via a limiting pin.

[0032] Furthermore, the mounting window has a beaded portion on each of the two sides of the face riveting assembly in the axial direction;

[0033] The edge portion is used to restrict the vibration damping elastic component in the axial direction of the face riveting assembly;

[0034] The vibration damping elastic component includes a first vibration damping spring and a second vibration damping spring;

[0035] The second damping spring is nested inside the first damping spring.

[0036] Furthermore, the face riveting assembly includes a vibration damping disc and a face sheet assembly;

[0037] The surface assembly is riveted to the vibration damping disc.

[0038] Furthermore, the surface assembly includes a friction plate and a connecting plate;

[0039] The friction plate is riveted to the connecting plate.

[0040] Furthermore, the flexible disk assembly includes a washer and a flexible disk;

[0041] The washer is riveted to the flexible disc.

[0042] As can be seen from the above technical solutions, the segmented cover plate structure designed in this application changes the traditional integral upper cover plate into a segmented cover plate structure composed of multiple circumferentially spaced cover plate pieces. Compared with the integral upper cover plate design, it improves the material utilization rate during part stamping, reduces production costs, and effectively reduces the weight of the upper cover plate, thus achieving lightweighting.

[0043] As can be seen from the above technical solutions, the flywheel assembly designed in this application uses the flywheel body to replace the lower cover plate and connects with the segmented cover plate structure, eliminating the traditional lower cover plate structure, which can reduce the number of parts, simplify the production process, improve the material utilization rate during part stamping, reduce production costs, and achieve lightweighting. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the first structural embodiment of a segmented cover plate structure provided in this application.

[0046] Figure 2 This is a schematic diagram of a second structural representation of a segmented cover plate structure provided in this application;

[0047] Figure 3 This is a schematic diagram of a third type of segmented cover plate structure provided in this application;

[0048] Figure 4 This is a perspective view of a torque damper provided in this application;

[0049] Figure 5 This is a first exploded schematic diagram of a torque damper provided in this application;

[0050] Figure 6 This is a second exploded schematic diagram of a torque damper provided in this application;

[0051] Figure 7 This is a cross-sectional view of a torque damper provided in this application;

[0052] Figure 8 This is a schematic diagram of the vibration damping elastic component of a torque damper provided in this application;

[0053] Figure 9 This is a schematic diagram of the surface riveting assembly of a torque damper provided in this application;

[0054] Figure 10 This is a schematic diagram of the surface assembly of a torque damper provided in this application;

[0055] Figure 11 This is a schematic diagram of the flexible disk assembly of a torque damper provided in this application;

[0056] In the diagram: 1. Flywheel body; 2. Driven disc; 3. Pressure washer; 4. Pressure elastic element; 5. Cover plate; 51. Cover plate rivet hole; 52. Flanged edge; 53. First plate; 54. Connecting plate; 55. Second plate; 6. Flexible disc assembly; 61. Washer; 62. Flexible disc; 7. Flywheel rivet; 8. Edge binding; 201. Face riveting assembly; 2011. Vibration damping disc; 2012. Face plate assembly; 20121. Friction plate; 20122, Connecting piece; 20123, Hollow rivet; 2013, Solid rivet; 202, First clamping piece; 203, Vibration damping elastic component; 2031, First vibration damping spring; 2032, Second vibration damping spring; 204, Damping disc; 205, Disc hub; 206, Second clamping piece; 207, Third clamping piece; 208, First driven elastic element; 209, Second driven elastic element; 210, Clamping disc; 211, Limiting pin. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0058] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0060] This application discloses a segmented cover plate structure, a flywheel assembly, and a torque damper.

[0061] Please see Figure 1 One embodiment of a segmented cover plate structure provided in this application includes:

[0062] Multiple cover plates 5 are distributed circumferentially, and each has a cover plate rivet hole 51.

[0063] The number, length, and thickness of the cover plates 5 can be varied according to actual needs. For example... Figure 1 As shown, the first structure of the cover plate 5 in this application can be an oval plate shape, on which at least two cover plate rivet holes 51 can be designed for riveting.

[0064] The segmented cover plate structure designed in this application changes the traditional integral upper cover plate into a segmented cover plate structure composed of multiple circumferentially spaced cover plate pieces 5. Compared with the integral upper cover plate design, it improves the material utilization rate during part stamping, reduces production costs, and effectively reduces the weight of the upper cover plate, thus achieving lightweighting.

[0065] The above is Embodiment 1 of a segmented cover plate structure provided in this application. The following is Embodiment 2 of a segmented cover plate structure provided in this application. Please refer to the following for details. Figures 2 to 3 .

[0066] Based on the solution of Embodiment 1 above:

[0067] Furthermore, when the cover plate 5 is designed to be relatively short, each section of the cover plate 5 has a downward-facing flange 52 added to its outer edge to form a snap-fit ​​structure, which restricts the axial rotational freedom of the cover plate 5 and makes it completely fixed; at the same time, this design also improves the overall structural strength of the cover plate 5. The relatively short cover plate 5 can be equipped with only one cover plate rivet hole 51.

[0068] Furthermore, when the cover plate 5 is designed to be relatively long, each section of the cover plate 5 is designed to include a first plate 53, a second plate 55, and a connecting plate 54. The first plate 53 and the second plate 55 are parallel and spaced apart in their own thickness direction. The connecting plate 54 is connected between the outer edge of the first plate 53 and the inner edge of the second plate 55. The connecting plate 54 can be set perpendicular to the first plate 53 and the second plate 55, so that the cross-section of the cover plate 5 is Z-shaped. Of course, the connecting plate 54 can also be set not perpendicular to the first plate 53 and the second plate 55. Those skilled in the art can make changes according to actual needs without limitation.

[0069] Furthermore, the first plate 53, the second plate 55, and the connecting plate 54 are designed as a single unit, which can be formed by bending or casting. The forming diameter (the outer edge diameter of the first plate 53) can be adjusted as needed without limitation. This multi-plate design increases the structural strength of the longer cover plate 5 and improves its service life.

[0070] The cover plate rivet holes 51 are opened on the second plate 55. For a longer cover plate 5, the number of cover plate rivet holes 51 can be increased accordingly, and the number of cover plates 5 can be reduced accordingly.

[0071] Of course, the cover plate 5 of this application is not limited to the three embodiments mentioned above. Those skilled in the art can make changes according to actual needs without restriction.

[0072] like Figure 4 As shown, this application also discloses a flywheel assembly, including a flywheel body 1 and a segmented cover plate structure; the flywheel body 1 is provided with flywheel rivet holes (not shown in the figure) that correspond one-to-one with the cover plate rivet holes 51 of the segmented cover plate structure; the flywheel body 1 and the segmented cover plate structure are riveted together by flywheel rivet members 7. Specifically, after the cover plate rivet holes 51 on the cover plate piece 5 of the segmented cover plate structure are aligned with the flywheel rivet holes, they are riveted and fixed by the flywheel rivet members 7.

[0073] The flywheel assembly designed in this application uses the flywheel body 1 to replace the lower cover plate and connect with the segmented cover plate structure, eliminating the traditional lower cover plate structure, which can reduce the number of parts, simplify the production process, improve material utilization, reduce production costs, and achieve lightweighting.

[0074] like Figures 4-11 As shown, this application also discloses a torque damper, including a driven disc 2, a clamping pad 3, a clamping elastic element 4, a flexible disc assembly 6, and a flywheel assembly.

[0075] The driven disc 2 is centrally mounted on the side of the flywheel body 1 of the flywheel assembly facing the segmented cover structure, with the flywheel body 1 as the lower cover and the segmented cover structure as the upper cover. Therefore, it can be understood that the driven disc 2 is centrally mounted upward on the flywheel body 1.

[0076] The clamping pad 3 is installed on the driven plate 2 and is located between the driven plate 2 and the segmented cover plate structure; specifically, the six claw holes in the middle of the clamping pad 3 are installed on the driven plate 2 through the six claw slots of the flywheel body 1 (the claw holes and claw slots are existing mating structure designs, and their specific number is not limited).

[0077] The clamping elastic element 4 is installed between the clamping pad 3 and the segmented cover plate structure, and is clamped to the clamping pad 3 by the clamping action of the segmented cover plate structure; specifically, the clamping elastic element 4 can be a butterfly spring, with its small end facing the clamping pad 3 and installed on the clamping pad 3.

[0078] The flexible disk assembly 6 is installed on the other side of the flywheel body 1, away from the segmented cover structure. Specifically, the positioning holes of the flexible disk assembly 6 are aligned with the positioning holes of the flywheel body 1 and installed on the bottom plane of the flywheel body 1 (the positioning holes are existing positioning and fitting structures, which will not be described in detail).

[0079] After the rivet holes 51 of the segmented cover plate structure are aligned with the flywheel rivet holes on the flywheel body 1 and the flexible rivet holes on the flexible disc assembly 6, they are riveted and fixed by the flywheel rivet 7. After riveting and fixing, the clamping elastic member 4 is pressed.

[0080] Furthermore, such as Figure 5 as well as Figure 6 As shown, the driven disc 2 includes a face riveting assembly 201, a first clamping plate 202, a second clamping plate 206, a third clamping plate 207, a vibration damping elastic assembly 203, a damping disc 204, a disc hub 205, a first driven elastic element 208, a second driven elastic element 209, and a clamping disc 210.

[0081] The first clamping plate 202 is fastened to the face riveting assembly 201; specifically, the first clamping plate 202 can be a nylon clamping plate type 1, with its four claws aligned and fastened into the four notches of the face riveting assembly 201 (the fastening and engagement of the claws and notches is an existing mating structure, which will not be described in detail).

[0082] The face riveting assembly 201 is provided with elastic mounting windows for the vibration damping elastic assembly 203 to be inserted; specifically, there are multiple elastic mounting windows, for example, 4, and there are 4 corresponding vibration damping elastic assemblies 203, which are inserted into the elastic mounting windows one by one and clamped.

[0083] The damping disc 204 is installed on the side of the first clamping plate 202 facing the segmented cover plate structure. Specifically, the process hole of the damping disc 204 is aligned with the process hole of the face riveting assembly 201 and is installed above the first clamping plate 202 (when the flywheel body 1 is the lower cover plate / the segmented cover plate structure is the upper cover plate). The process hole is a hole structure with a corresponding fit, which will not be described in detail.

[0084] The hub 205 is mounted on the damping disc 204, and its external teeth mesh with the internal teeth in the middle of the damping disc 204.

[0085] The first driven elastic element 208 is installed on the second clamping plate 206. Specifically, the first driven elastic element 208 is a disc spring type 1, and the second clamping plate 206 is a nylon clamping plate type 2. The small end of the first driven elastic element 208 faces the second clamping plate 206 and is installed between the four claws of the second clamping plate 206. The four claws of the second clamping plate 206 are aligned and snapped into the claw holes of the clamping disc 210.

[0086] The outer teeth of the third clamping plate 207 are aligned with the inner teeth of the clamping disc 210 and are mounted on the disc hub 205; specifically, the third clamping plate 207 is a nylon clamping plate type 3.

[0087] The second driven elastic element 209 is installed on the third pressing plate 207; specifically, the second driven elastic element 209 is a butterfly spring type 2, with its small end facing the third pressing plate 207 and installed on the third pressing plate 207.

[0088] The clamping disc 210 is riveted to the face riveting assembly 201 by limiting pins 211. Specifically, the process holes of the clamping disc 210 are aligned with the process holes on the face riveting assembly 201, and then riveted and fixed by multiple (e.g., four) limiting pins 211.

[0089] Furthermore, such as Figure 4 as well as Figure 6 As shown, the mounting window has a binding portion 8 on each of the two edges of the face riveting assembly 201 in the axial direction; the binding portion 8 is used to restrict the vibration damping elastic assembly 203 in the axial direction of the face riveting assembly 201. By changing the traditional flange design of the window to a binding design, the application of the spring seat structure can be eliminated, thereby reducing the number of parts, saving installation steps and costs, and achieving the goal of lightweighting.

[0090] like Figure 8 As shown, the vibration damping elastic component 203 includes a first vibration damping spring 2031 and a second vibration damping spring 2032, with the second vibration damping spring 2032 nested in the first vibration damping spring 2031.

[0091] Furthermore, such as Figure 9 As shown, the face riveting assembly 201 includes a damping disk 2011 and a face plate assembly 2012; the face plate assembly 2012 is riveted to the damping disk 2011. Specifically, the rivet holes and process holes of the connecting piece 20122 in the face plate assembly 2012 are aligned with the rivet holes and process holes of the damping disk 2011, and the two are riveted together by solid rivets 2013.

[0092] Furthermore, such as Figure 10As shown, the faceplate assembly 2012 includes a friction plate 20121 and a connecting plate 20122; the friction plate 20121 and the connecting plate 20122 are riveted together. Specifically, the rivet hole of the friction plate 20121 is aligned with the rivet hole of the connecting plate 20122, and the two are riveted together by a hollow rivet 20123.

[0093] Furthermore, if Figure 11 As shown, the flexible disk assembly 6 includes a washer 61 and a flexible disk 62; the washer 61 and the flexible disk 62 are riveted together. Specifically, the riveting hole of the washer 61 is aligned with the riveting boss of the flexible disk 62, and the two are riveted together to form the flexible disk assembly 6.

[0094] Specifically, the clamping plate 210 has its process holes aligned with the process holes of the damping plate 2011 and the damping plate 204, and is then riveted to the damping plate 2011 by four limit pins 211.

[0095] like Figure 5 , Figure 8 As shown, the aforementioned edge-wrapping portion 8 is specifically provided on the window edge of the damping disk 2011 and the window edge of the clamping disk 210. Specifically, the upper edge of the window of the damping disk 2011 extends to both ends with edge-wrapping portions 8, and correspondingly, the upper edge of the window of the clamping disk 210 extends to both ends with edge-wrapping portions 8. Compared with the traditional flange design, since edge-wrapping structures are also formed at both ends, the setting of end spring seats can be reduced, thereby reducing the number of parts and achieving the purpose of weight reduction.

[0096] The torque damper designed in this application integrates the aforementioned improvements: 1. A segmented cover plate structure design, which significantly improves material utilization and reduces weight compared to the traditional integral upper cover plate design. 2. Using the flywheel body 1 to replace the traditional lower cover plate in contact with the friction plate 20121 reduces the number of parts and lightens the weight. 3. The flexible mounting window has been changed from the traditional flanged design to a wrapped edge design, reducing the number of spring seat parts. Through these improvements, the number of damper parts is effectively reduced, product weight is lowered, material utilization during part stamping is improved, production processes are simplified, and production costs are reduced.

[0097] The above provides a detailed description of the segmented cover plate structure, flywheel assembly, and torque damper provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A segmented cover plate structure, characterized in that, Includes multiple cover plates (5); The multiple cover plates (5) are distributed circumferentially, and each has a cover plate rivet hole (51).

2. The segmented cover plate structure according to claim 1, characterized in that, Each section of the cover plate (5) has a downward-facing flange (52) on its outer edge.

3. The segmented cover plate structure according to claim 1, characterized in that, Each of the cover plates (5) includes a first plate (53), a second plate (55), and a connecting plate (54); The first plate (53) and the second plate (55) are parallel and spaced apart in their own thickness direction; The connecting plate (54) is connected between the outer edge of the first plate (53) and the inner edge of the second plate (55); The rivet hole (51) of the cover plate is opened in the second plate (55).

4. A flywheel assembly, characterized in that, It includes a flywheel body (1) and a segmented cover plate structure as described in any one of claims 1 to 3; The flywheel body (1) is provided with flywheel rivet holes that correspond one-to-one with the rivet holes (51) of the segmented cover plate structure; The flywheel body (1) and the segmented cover plate structure are riveted together by flywheel rivet parts (7).

5. A torque damper, characterized in that, It includes a driven disc (2), a clamping pad (3), a clamping elastic element (4), a flexible disc assembly (6), and a flywheel assembly as described in claim 4; The driven disc (2) is centrally mounted on the side of the flywheel body (1) of the flywheel assembly facing the segmented cover plate structure; The clamping pad (3) is installed on the driven plate (2) and is located between the driven plate (2) and the segmented cover plate structure; The clamping elastic element (4) is installed between the clamping pad (3) and the segmented cover plate structure, and is clamped to the clamping pad (3) by the clamping action of the segmented cover plate structure. The flexible disk assembly (6) is installed on the other side of the flywheel body (1) facing away from the segmented cover structure.

6. The torque damper according to claim 5, characterized in that, The driven disk (2) includes a face riveting assembly (201), a first clamping plate (202), a second clamping plate (206), a third clamping plate (207), a vibration damping elastic assembly (203), a damping disk (204), a disk hub (205), a first driven elastic element (208), a second driven elastic element (209), and a clamping disk (210). The first clamping piece (202) is fastened to the face riveting assembly (201); The face riveting assembly (201) is provided with an elastic mounting window for inserting the vibration damping elastic assembly (203); The damping disc (204) is installed on the side of the first clamping plate (202) facing the segmented cover structure; The hub (205) is mounted on the damping disc (204), and its external teeth mesh with the internal teeth in the middle of the damping disc (204). The first driven elastic element (208) is mounted on the second clamping plate (206); The second clamping plate (206) is fastened to the clamping plate (210); The outer teeth of the third clamping plate (207) are aligned with the inner teeth of the clamping disc (210) and are mounted on the disc hub (205); The second driven elastic element (209) is mounted on the third clamping plate (207); The clamping disc (210) is riveted to the face riveting assembly (201) by a limiting pin (211).

7. The torque damper according to claim 6, characterized in that, The mounting window is provided with a binding portion (8) on both sides of the face riveting assembly (201) in the axial direction. The edge portion (8) is used to restrict the vibration damping elastic component (203) in the axial direction of the face riveting assembly (201). The vibration damping elastic component (203) includes a first vibration damping spring (2031) and a second vibration damping spring (2032); The second damping spring (2032) is nested in the first damping spring (2031).

8. The torque damper according to claim 6, characterized in that, The face riveting assembly (201) includes a vibration damping disc (2011) and a face sheet assembly (2012). The surface assembly (2012) is riveted to the damping disc (2011).

9. The torque damper according to claim 8, characterized in that, The surface assembly (2012) includes a friction plate (20121) and a connecting plate (20122); The friction plate (20121) is riveted to the connecting plate (20122).

10. The torque damper according to claim 5, characterized in that, The flexible disk assembly (6) includes a gasket (61) and a flexible disk (62). The washer (61) is riveted to the flexible disk (62).

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