A clutch with enhanced friction torque

Abstract

The present invention belongs to the technical field of automobile clutches, and in particular relates to a clutch with enhanced friction torque, comprising n+1 pairs of steel plates and n friction plates, where n is an integer not less than 2, the pairs of steel plates and the friction plates being spaced apart, the pairs of steel plates being located on the outside of the friction plates, the pairs of steel plates located at the ends being high-order deformed steel plates, and the pairs of steel plates located between the two high-order deformed steel plates being straight steel plates; the friction plates arranged between the high-order deformed steel plates and the straight steel plates being lubricating friction plates, the high-order deformed steel plates being provided with a sliding friction surface for rubbing against one side of the lubricating friction plates, and the other side of the lubricating friction plates being frictionally matched with the side surface of the corresponding straight steel plates; friction contact areas and lubrication groove areas for enhancing friction torque and heat dissipation effects are provided on the friction matching surfaces of the lubricating friction plates and the straight steel plates; when n is greater than 2, the friction plates arranged between the two adjacent straight steel plates are double-sided friction plates.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile clutches, and in particular relates to a clutch with enhanced friction torque. Background Art

[0002] Wet-type shift clutches, with their unique advantages of high load-carrying capacity, high torque transmission, and simple structure, are widely used in vehicle transmissions and are core components of various stepped transmissions. However, as transmissions develop towards higher power density, higher reliability, higher integration, and higher lightweighting, clutches face increasing exposure to harsh operating environments, such as high speed differentials, heavy loads, extreme high and low temperatures, and strong disturbances. This has led to clutch failure, a key bottleneck restricting the service life and power density of various transmissions.

[0003] There are two main methods for increasing clutch friction torque: one is to enhance the friction and wear characteristics of friction elements through material modification research, and the other is to increase friction torque by increasing the number of friction pairs. However, material changes increase clutch cost, and increasing the number of friction pairs increases clutch size. As a result, due to cost and size constraints, it is currently impossible to effectively increase friction torque in clutches.

[0004] Research has revealed that there is currently a lack of approaches to increasing clutch friction torque through structural design or optimization within a limited space, and even less so, approaches that address the generation mechanism of friction torque by changing the contact form and contact area of ​​the friction pair. Therefore, we propose a clutch with enhanced friction torque to address this issue. Summary of the Invention

[0005] The object of the present invention is to provide a clutch with enhanced friction torque to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A clutch with enhanced friction torque comprises n+1 pairs of steel plates and n friction plates, where n is an integer not less than 2, wherein the pairs of steel plates and the friction plates are spaced apart, and the pairs of steel plates are located outside the friction plates.

[0008] The dual steel sheets at the ends are high-order deformed steel sheets. During long-term sliding friction conditions, the high-order deformed steel sheets undergo circumferential elastic deformation and come into local contact with the friction sheets to increase friction torque. The dual steel sheet located between the two high-order deformed steel sheets is a straight steel sheet.

[0009] The friction plate disposed between the high-order deformed steel plate and the straight steel plate is a lubricating friction plate, wherein the high-order deformed steel plate is provided with a sliding friction surface for rubbing against one side of the lubricating friction plate, and the other side of the lubricating friction plate is frictionally engaged with the corresponding side surface of the straight steel plate;

[0010] The friction mating surface between the lubricating friction plate and the straight steel plate is provided with a friction contact area and a lubricating groove area for enhancing the friction torque and heat dissipation effect;

[0011] When n is greater than 2, the friction plate arranged between two adjacent straight steel plates is a double-sided friction plate, and the side surfaces of the double-sided friction plate are frictionally matched with the side surfaces of the corresponding straight steel plates.

[0012] According to a clutch with enhanced friction torque provided by the present invention, the high-order deformed steel sheet is made from the straight steel sheet, the straight steel sheet is assembled on a clutch stand, the clutch stand working condition is set and operated, so that the straight steel sheet is deformed until the friction torque transmitted by the straight steel sheet is not lower than the critical torque for high-order circumferential deformation, thereby making the high-order deformed steel sheet.

[0013] According to a clutch with enhanced friction torque provided by the present invention, the total friction torque is collected and the friction torque transmitted by a single straight steel sheet is estimated. If the friction torque transmitted by a single straight steel sheet is lower than the critical torque for the occurrence of high-order circumferential deformation, the piston pressure is increased by 0.1 MPa and the test is repeated until the friction torque transmitted by a single straight steel sheet is not lower than the critical torque for the occurrence of high-order circumferential deformation.

[0014] According to the clutch with enhanced friction torque provided by the present invention, after each sliding friction ends, the clutch test bench is cooled for 10 minutes and then the test is repeated until the friction torque data shows a step increase for three consecutive times.

[0015] According to a clutch with enhanced friction torque provided by the present invention, the lubricating friction plate includes a first substrate, and a first friction surface and a second friction surface are respectively provided on both sides of the first substrate;

[0016] The first friction surface is used for frictionally cooperating with the corresponding surface of the flat steel sheet, and the first friction surface includes a plurality of friction contact areas and a plurality of lubrication groove areas arranged in a surrounding manner, wherein the friction contact areas and the lubrication groove areas are arranged at intervals, and the area of ​​the friction contact areas accounts for 40% to 60% of the area of ​​the first friction surface;

[0017] The second friction surface is used for frictionally engaging with the corresponding surface of the high-order deformed steel sheet. The second friction surface is provided with a plurality of coaxially arranged texture hole rings, and two adjacent texture hole rings are arranged at equal intervals. The texture hole rings are composed of a plurality of equally spaced texture holes. The number of the texture holes in the texture hole rings close to the center of the circle is greater than the number of the texture holes in the texture hole rings away from the center of the circle, and the depth of the texture holes does not exceed the thickness of the second friction surface.

[0018] According to the friction torque enhanced clutch provided by the present invention, the maximum pore diameter of the textured pores does not exceed 5 mm.

[0019] According to a clutch with enhanced friction torque provided by the present invention, the double-sided friction plate includes a second base plate, and third friction surfaces are respectively provided on both sides of the second base plate, and the third friction surfaces are used for frictionally engaging with corresponding surfaces of the straight steel plate;

[0020] The third friction surface is provided with first circular arc grooves and second circular arc grooves which are circumferentially and evenly spaced. The total groove area of ​​the first circular arc grooves and the second circular arc grooves accounts for 35% of the area of ​​the third friction surface.

[0021] According to a clutch with enhanced friction torque provided by the present invention, the groove width of the first circular arc groove and the second circular arc groove is 1 mm, and the groove depth is 0.3-0.4 mm.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] When in use, the straight steel plate is installed in a position that does not contact the piston and the pressure plate, and is located in the middle position of the friction pair system. The high-order deformed steel plate is installed in the position that contacts the piston and the pressure plate. There are only two high-order deformed steel plates in each clutch. Since there is only one friction surface with sliding friction at this position, the friction torque can be increased and heat generation can be reduced. The double-sided friction plate only has contact and friction with the straight steel plate. Both friction surfaces of the friction plate A are involved in the work, which can increase the friction torque and increase the heat dissipation effect. The lubricating friction plate is set with one side of the friction contact area and the lubrication groove area facing the straight steel plate to enhance the friction torque and heat dissipation effect. The other side of the lubricating friction plate faces the high-order deformed steel plate. There are only two lubricating friction plates in each clutch. Through the above settings, the friction torque of the clutch can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the third friction surface of the double-sided friction plate of the present invention;

[0027] Figure 3 This is a cross-sectional view of the double-sided friction plate of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the second friction surface of the lubricating friction plate of the present invention;

[0029] Figure 5 This is a schematic structural diagram of the first friction surface of the lubricating friction plate of the present invention;

[0030] Figure 6 This is a cross-sectional view of the lubricating friction plate of the present invention;

[0031] Figure 7 Schematic diagram of the texture pore thickness of the present invention;

[0032] Figure 8 A comparison diagram of the friction torque between the clutch of the present invention and the conventional clutch under the same working conditions;

[0033] Among them, 1. Piston; 2. Straight steel plate; 3. High-order deformed steel plate; 4. Double-sided friction plate; 5. Lubricating friction plate; 6. Pressure plate; 7. Snap ring. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figures 1 to 8The present invention discloses a clutch with enhanced friction torque, comprising n+1 pairs of steel plates and n friction plates, where n is an integer not less than 2, the pairs of steel plates and the friction plates are spaced apart, and the pairs of steel plates are located outside the friction plates.

[0037] The dual steel sheet at the end is a high-order deformed steel sheet 3. During long-term sliding friction conditions, the high-order deformed steel sheet 3 undergoes circumferential elastic deformation and produces local contact with the friction plate to increase the friction torque. The dual steel sheet located between the two high-order deformed steel sheets 3 is a straight steel sheet 2.

[0038] The friction plate disposed between the high-order deformed steel plate 3 and the straight steel plate 2 is a lubricating friction plate 5. The high-order deformed steel plate 3 is provided with a sliding friction surface for rubbing against one side of the lubricating friction plate 5. The other side of the lubricating friction plate 5 is frictionally engaged with the corresponding side surface of the straight steel plate 2.

[0039] The friction mating surface between the lubricating friction plate 5 and the straight steel plate 2 is provided with a friction contact area and a lubricating groove area for enhancing the friction torque and heat dissipation effect;

[0040] When n is greater than 2, the friction plate arranged between two adjacent straight steel plates 2 is a double-sided friction plate 4 , and the side surfaces of the double-sided friction plate 4 are frictionally engaged with the side surfaces of the corresponding straight steel plates 2 .

[0041] When in use, the straight steel sheet 2 is installed in a position that does not contact the piston and the pressure plate, and is located in the middle position of the friction pair system. The high-order deformed steel sheet 3 is installed in the position that contacts the piston and the pressure plate. There are only two high-order deformed steel sheets 3 in each clutch. Since there is only one friction surface with sliding friction at this position, the friction torque can be increased and heat generation can be reduced. The double-sided friction plate 4 only has contact and friction relationship with the straight steel sheet 2. Both friction surfaces of the friction plate 5A are involved in the work, which can increase the friction torque and increase the heat dissipation effect. The lubricating friction plate 5 sets the friction contact area and the lubrication groove area with one side facing the straight steel sheet 2 to enhance the friction torque and heat dissipation effect. The other side of the lubricating friction plate 5 faces the high-order deformed steel sheet 3. There are only two lubricating friction plates 5 in each clutch. Through the above settings, the friction torque of the clutch can be significantly improved.

[0042] As an optional embodiment, the high-order deformed steel sheet 3 is made of a straight steel sheet 2. The straight steel sheet 2 is assembled on the clutch test bench, and the clutch test bench working conditions are set and operated to cause the straight steel sheet 2 to deform until the friction torque transmitted by the straight steel sheet 2 is not lower than the critical torque for high-order circumferential deformation, thereby obtaining a high-order deformed steel sheet 3.

[0043] As an optional implementation method, the total friction torque is collected and the friction torque transmitted by a single straight steel sheet 2 is estimated. If the friction torque transmitted by a single straight steel sheet 2 is lower than the critical torque for high-order circumferential deformation, the piston pressure is increased by 0.1 MPa and the test is repeated until the friction torque transmitted by a single straight steel sheet 2 is not lower than the critical torque for high-order circumferential deformation.

[0044] Friction torque transmitted by a single friction pair: (M n 、M f and N are the friction torque of a single friction pair of the clutch, the total friction torque collected, and the number of friction pairs, respectively);

[0045] Therefore, the friction torques borne by the flat steel sheet subjected to single-sided friction or double-sided friction are: M n , 2M n .

[0046] The calculation formula for the critical torque of the straight steel sheet 2 spline teeth that undergoes high-order deformation is:

[0047]

[0048] B2 is the bending stiffness of the steel sheet. C2 is the torsional stiffness of the steel sheet, b and h are the width and thickness of the dual steel sheets, respectively; E and G are the elastic modulus and torsional modulus, respectively;

[0049] a represents the distance of the load point vertically above the center of mass, R s is the pitch radius of the dual steel sheet; ξ=kR s 2 , k is the modal constant.

[0050] Higher-order deformation of a straight steel sheet will only occur when the following torque relationship is satisfied:

[0051]

[0052] Where m is the number of teeth of the straight steel sheet;

[0053] As an optional embodiment of the present invention, after each sliding friction is completed, the clutch test bench is cooled for 10 minutes and then the test is repeated until the friction torque data shows a step increase for three consecutive times.

[0054] Straight steel plate 2 is a new straight dual steel plate.

[0055] The high-order deformed steel sheet 3 is obtained by further processing on the basis of the new straight steel sheet 2, specifically:

[0056] In the first step, a new, straight steel plate (2) was assembled onto a clutch stand, followed by the fabrication of a high-order deformed steel plate (3). After assembly, the clutch was operated under low speed (50 rpm), high piston pressure (assessed by friction torque), and a long sliding period (15 seconds).

[0057] In the second step, during the clutch operating condition setting, an initial piston pressure of 1 MPa was given to manufacture the high-order deformed steel plate 3. The total friction torque collected was used to estimate the friction torque transmitted by a single straight steel plate 2. For a dual steel plate with inner and outer radii of (86 mm, 125 mm) and 18 spline teeth (tooth thickness 2 mm, tooth width 14 mm), the critical torque for mechanical buckling of each spline tooth is 12.19 N·m. Therefore, the critical torque for high-order deformation of the steel plate is 219.42 N·m. To ensure high-order deformation, the friction torque is set above 230 N·m.

[0058] If the friction torque transmitted by a single flat steel sheet 2 is lower than 230 N·m, the piston pressure is increased by 0.1 MPa, and then the test is continued. This process is repeated until the friction torque transmitted by a single flat steel sheet 2 is higher than 230 N·m.

[0059] In the above steps, after each sliding friction, the clutch is cooled for 10 minutes, and then the test is repeated until the friction torque data shows a step increase for three consecutive times.

[0060] After the friction torque data shows a step increase for three consecutive times, the clutch is disassembled and the original straight steel sheet 2 is taken out. At this time, the straight steel sheet 2 has undergone a manufacturing process and has been converted into a high-order deformed steel sheet 3.

[0061] As an optional embodiment of the present invention, the lubricating friction plate 5 includes a first substrate, and a first friction surface and a second friction surface are respectively provided on both sides of the first substrate;

[0062] The first friction surface is used for frictionally cooperating with the corresponding surface of the flat steel sheet 2. The first friction surface includes a plurality of friction contact areas and a plurality of lubrication groove areas arranged in a surrounding manner. The friction contact areas and the lubrication groove areas are arranged at intervals. The area of ​​the friction contact areas accounts for 40%-60% of the area of ​​the first friction surface.

[0063] The second friction surface is used for friction cooperation with the corresponding surface of the high-order deformed steel sheet 3. A plurality of coaxially arranged texture hole rings are provided on the second friction surface. Two adjacent texture hole rings are arranged at equal intervals. The texture hole rings are composed of a plurality of equally spaced texture holes. The number of texture holes in the texture hole ring close to the center of the circle is greater than the number of texture holes in the texture hole ring far from the center of the circle. The depth of the texture holes does not exceed the thickness of the second friction surface.

[0064] As an optional embodiment of the present invention, the maximum pore diameter of the textured pores does not exceed 5 mm.

[0065] The friction surface between the lubricating friction plate 5 and the straight steel plate 2 is provided with a friction contact area and a lubricating groove area, which are arranged in an intermittent alternating manner; the friction contact area is completely separated from the lubricating groove area; the central angles corresponding to all friction contact areas or lubricating groove areas are consistent; the groove form of the lubricating groove area is not limited, and can be fan-shaped, rectangular, elliptical, etc.; the contact area of ​​the friction contact area accounts for 40%-60% of the total area of ​​the friction layer s1.

[0066] The friction surfaces between the lubricating friction plate 5 and the high-order deformed steel plate 3 are arranged with textured holes. The textured holes can take various forms, including rectangular, diamond, circular, elliptical, and irregular shapes. The maximum diameter of the textured holes does not exceed 5 mm, and the hole depth does not exceed the thickness of the friction layer. The textured holes are arranged at equal intervals in the radial direction. The density of the textured holes at different radial positions varies in the circumferential direction. The density of the textured holes near the inner diameter is the highest, and the density of the textured holes decreases as they approach the outer diameter. The provision of textured holes can change the radial heat flux distribution of the high-order deformed steel plate 3, improve the uniformity of the radial temperature rise of the high-order deformed steel plate 3, and effectively prevent failure of the high-order deformed steel plate 3.

[0067] As an optional embodiment of the present invention, the double-sided friction plate 4 includes a second substrate, and third friction surfaces are respectively provided on both sides of the second substrate, and the third friction surfaces are used to frictionally cooperate with the corresponding surfaces of the flat steel plate 2;

[0068] The third friction surface is provided with first circular arc grooves and second circular arc grooves which are circumferentially and evenly spaced. The total groove area of ​​the first circular arc grooves and the second circular arc grooves accounts for 35% of the area of ​​the third friction surface.

[0069] As an optional embodiment of the present invention, the first arc groove and the second arc groove have a groove width of 1 mm and a groove depth of 0.3-0.4 mm.

[0070] Double arc grooves are pressed on both sides of the double-sided friction plate 4. The groove width is 1mm and the depth is 0.3-0.4mm. The groove area accounts for 35% of the friction layer area.

[0071] Compared with the clutch of traditional structure, the present invention relates to friction plates and dual steel plates of different structural forms:

[0072] 1) The high-order deformed steel plate 3, the double-sided friction plate 4 and the lubricating friction plate 5 are provided with a friction contact area and a lubricating groove area on one side to enhance the friction torque.

[0073] 2) Compared with the original clutch, under normal operating conditions, the double-sided friction plate 4 and the lubricating friction plate 5 of the clutch of the present invention have a friction contact area and a lubricating groove area on one side to enhance the friction torque, and there is no significant difference between the straight steel plate 2 and the high-order deformed steel plate 3;

[0074] 3) When the vehicle is in a long-term sliding friction condition, as the friction temperature and friction time increase, the high-order deformed steel sheet 3 will undergo circumferential elastic deformation, resulting in local contact, which will enhance the friction torque.

[0075] 4) Help the clutch end slipping and complete engagement.

[0076] 5) By combining and installing these various friction elements in different locations, the clutch friction torque is increased while also ensuring that the friction elements do not fail. This arrangement significantly expands the clutch's torque capacity and adapts to varying operating conditions.

[0077] As one embodiment of the present invention, a wet-type shift clutch with six friction pairs is provided, and the preparation steps include:

[0078] The first step is to prepare a high-order deformed steel sheet 3;

[0079] The second step is to prepare a double-sided friction plate 4;

[0080] The third step is to prepare the friction contact area and lubrication groove area of ​​the lubricating friction plate 5: four evenly distributed fan-shaped lubrication grooves are set in the circumferential direction. The central angle of each lubrication groove is 36 degrees. The friction contact area and the lubrication groove area are completely separated. The groove depth is about 0.3-0.4mm, and the groove area accounts for 40% of the friction layer area.

[0081] Step 4: Prepare the contact surface between the lubricating friction plate 5 and the lubricating friction plate 5: Arrange a gradient of textured holes in the radial direction. The textured holes are circular, with a radius of 1.5 mm and a depth of approximately 0.3-0.4 mm. This embodiment has six circles of textured holes, with adjacent circles of textured holes spaced equally apart. The circumferential density of textured holes is highest near the inner diameter, and decreases towards the outer diameter. Starting from the innermost circle, the number of circumferential textured holes is 100, 80, 60, 50, 40, and 30, respectively.

[0082] The fifth step is to assemble the clutch, piston, high-order deformed steel plate 3, lubricating friction plate 5, straight steel plate 2, double-sided friction plate 4, straight steel plate 2, lubricating friction plate 5, high-order deformed steel plate 3, and pressure plate.

[0083] Friction torque comparison tests were conducted using the original clutch and the clutch of the present invention. The test conditions were: piston pressure of 0.08 MPa, relative speed of 300 rpm, passive end braking, and a sliding friction duration of 12 seconds. Once the piston pressure stabilized, the friction torque of the original clutch stabilized at 176 N·m. In stage A of the clutch of the present invention, the friction contact area and lubrication groove area on one side of the double-sided friction plate 4 and the lubricating friction plate 5 enhance the friction torque, which gradually increases to nearly 195 N·m. As the sliding friction duration increases, the high-order deformed steel plate 3 undergoes circumferential elastic deformation, and its contact state changes from uniform contact to partial contact, increasing the friction torque to approximately 213 N·m.

[0084] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0085] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A clutch with enhanced friction torque, comprising n+1 pairs of steel plates and n friction plates, where n is an integer not less than 2, the pairs of steel plates and the friction plates being spaced apart, the pairs of steel plates being located outside the friction plates, and characterized in that: The dual steel sheets located at the ends are high-order deformed steel sheets (3). During long-term sliding friction conditions, the high-order deformed steel sheets (3) undergo circumferential elastic deformation to generate local contact with the friction sheet to increase friction torque. The dual steel sheet located between the two high-order deformed steel sheets (3) is a straight steel sheet (2). The friction plate arranged between the high-order deformed steel plate (3) and the straight steel plate (2) is a lubricating friction plate (5), the high-order deformed steel plate (3) is provided with a sliding friction surface for rubbing against one side of the lubricating friction plate (5), and the other side of the lubricating friction plate (5) is frictionally matched with the corresponding side surface of the straight steel plate (2); The friction matching surface between the lubricating friction plate (5) and the flat steel plate (2) is provided with a friction contact area and a lubricating groove area for enhancing friction torque and heat dissipation effect; When n is greater than 2, the friction plate arranged between two adjacent straight steel plates (2) is a double-sided friction plate (4), and the side surfaces of the double-sided friction plate (4) respectively frictionally cooperate with the side surfaces of the corresponding straight steel plates (2).

2. The friction torque enhanced clutch according to claim 1, characterized in that: The high-order deformed steel sheet (3) is made from the straight steel sheet (2). The straight steel sheet (2) is assembled on a clutch stand, and the clutch stand is set to a working condition and operated to deform the straight steel sheet (2) until the friction torque transmitted by the straight steel sheet (2) is not lower than the critical torque for high-order circumferential deformation, thereby making the high-order deformed steel sheet (3).

3. The friction torque enhanced clutch according to claim 2, characterized in that: The total friction torque is collected and the friction torque transmitted by a single straight steel sheet (2) is estimated. If the friction torque transmitted by a single straight steel sheet (2) is lower than the critical torque for the occurrence of high-order circumferential deformation, the test is repeated after the piston pressure is increased by 0.1 MPa until the friction torque transmitted by a single straight steel sheet (2) is not lower than the critical torque for the occurrence of high-order circumferential deformation.

4. The friction torque enhanced clutch according to claim 3, characterized in that: After each sliding friction, the clutch test bench was cooled for 10 minutes and then the test was repeated until the friction torque data showed a step increase for three consecutive times.

5. The friction torque enhanced clutch according to claim 2, characterized in that: The lubricating friction plate (5) comprises a first substrate, with a first friction surface and a second friction surface respectively provided on two sides of the first substrate; The first friction surface is used for frictionally cooperating with the corresponding surface of the flat steel sheet (2), the first friction surface comprises a plurality of friction contact areas and a plurality of lubrication groove areas arranged in a surrounding manner, the friction contact areas and the lubrication groove areas are arranged at intervals, and the area of ​​the friction contact areas accounts for 40% to 60% of the area of ​​the first friction surface; The second friction surface is used for frictionally engaging with the corresponding surface of the high-order deformed steel sheet (3); a plurality of coaxially arranged texture hole rings are provided on the second friction surface; two adjacent texture hole rings are arranged at equal intervals; the texture hole rings are composed of a plurality of equally spaced texture holes; the number of the texture holes in the texture hole rings close to the center of the circle is greater than the number of the texture holes in the texture hole rings far from the center of the circle; and the depth of the texture holes does not exceed the thickness of the second friction surface.

6. The friction torque enhanced clutch according to claim 5, characterized in that: The maximum pore diameter of the textured pores does not exceed 5 mm.

7. The friction torque enhanced clutch according to claim 1, characterized in that: The double-sided friction plate (4) comprises a second base plate, and third friction surfaces are respectively provided on both sides of the second base plate, and the third friction surfaces are used for frictionally cooperating with corresponding surfaces of the flat steel plate (2); The third friction surface is provided with first circular arc grooves and second circular arc grooves which are circumferentially and evenly spaced. The total groove area of ​​the first circular arc grooves and the second circular arc grooves accounts for 35% of the area of ​​the third friction surface.

8. The friction torque enhanced clutch according to claim 7, characterized in that: The groove width of the first circular arc groove and the second circular arc groove is 1 mm, and the groove depth is 0.3-0.4 mm.

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