Limiting member for dual clutch, dual clutch and pre-assembly method thereof, and assembly method of transmission

Abstract

A position limiting member for a dual clutch comprises a cylindrical main body (41) and a plurality of first engaging portions, wherein the first engaging portions are arranged on a portion of the main body (41) for being opposite to the inner hubs (11, 21) of two clutch assemblies (1, 2) of the dual clutch, and can be matched and engaged with the second engaging portions of the inner hubs (11, 21), so that the inner hubs of the two clutch assemblies (1, 2) are coaxially fixed relative to the position limiting member (4) at least in the circumferential direction and radial direction (R) of the dual clutch. A dual clutch comprising the position limiting member and a preassembly method thereof, as well as an assembly method of a transmission comprising the dual clutch are also provided. The position limiting member is used to avoid the spline misalignment of the two inner hubs in the dual clutch in the preassembly state and the non-coaxiality of the inner hub and the connecting sleeve, thereby eliminating the problem that the dual clutch cannot be smoothly installed on the shaft of the transmission due to these unfavorable conditions, making the installation process of the dual clutch easy.

Description

Technical Field

[0001] The present invention relates to the field of vehicle clutches, and in particular to a limiter for a dual clutch, a dual clutch including the limiter and a preassembly method thereof, and an assembly method of a transmission including the dual clutch. Background Art

[0002] A dual clutch includes two clutch assemblies and a centered slave cylinder. Specifically, each clutch assembly includes an inner hub for fixedly mounting on a shaft (e.g., an input shaft) of a transmission, an outer hub located radially outward of the inner hub, and a clutch unit located between the inner hub and the outer hub. The inner hub is formed with a spline for torsionally connecting to the shaft of the transmission. The clutch unit includes friction discs and pressure plates alternately arranged in the axial direction of the clutch assembly, one of the friction discs and the pressure plate being torsionally mounted (i.e., not relatively rotatable) on the inner hub, and the other being torsionally mounted on the outer hub. The centered slave cylinder includes a housing, a piston, a bearing, and a preload spring mounted on the housing. When the dual clutch is mounted on the shaft of the transmission, the centered slave cylinder is mounted between the two clutch assemblies in the axial direction of the dual clutch, and the preload spring applies a preload spring force to the two clutch assemblies located on both sides via the piston and the bearing.

[0003] However, before the dual clutch is installed on the shaft of the transmission, the two inner hubs may rotate relative to each other, so that the splines of the two inner hubs may be misaligned, which will hinder the smooth installation of the dual clutch on the shaft of the transmission. Summary of the invention

[0004] The present invention is made in view of the above-mentioned problems of the prior art. One object of the present invention is to provide a limiter for a dual clutch, a dual clutch including the limiter, and a preassembly method thereof, wherein the limiter can avoid the spline misalignment of the inner hubs of the two clutch assemblies and the misalignment of the inner hubs with the connecting sleeve in the dual clutch in a preassembly state. Another object of the present invention is to provide an assembly method for a transmission including the above-mentioned dual clutch, wherein the assembly method utilizes the limiter to avoid the spline misalignment of the inner hubs of the two clutch assemblies and the misalignment of the inner hubs with the connecting sleeve in the dual clutch in a preassembly state, thereby eliminating the problem that the dual clutch cannot be smoothly installed on the shaft of the transmission due to these unfavorable conditions.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution.

[0006] The present invention provides a dual clutch limiter as follows, the limiter comprising:

[0007] a main body portion, the main body portion being formed in a cylindrical shape; and

[0008] A plurality of first engaging portions are arranged on a portion of the main body portion that is opposite to the inner hubs of the two clutch assemblies of the dual clutch, and can be matched and engaged with the second engaging portions of the inner hubs, so that the inner hubs of the two clutch assemblies are coaxially fixed relative to the limit member at least in the circumferential and radial directions of the dual clutch.

[0009] Preferably, on either axial side of the main body portion, the first engaging portion is axially extendingly arranged and evenly distributed along the circumference of the main body portion.

[0010] More preferably, the first engaging portion is a protrusion protruding from the axial end surface of the main body, and at least two protrusions are provided on either axial side of the main body; and / or

[0011] The first engaging portion is a recessed portion recessed from the axial end surface of the main body portion, and at least two recessed portions are provided on either axial side of the main body portion.

[0012] More preferably, the outer circumferential surface of each of the protruding portions or the recessed portions is flush with the outer circumferential surface of the main body portion and / or the inner circumferential surface of each of the protruding portions or the recessed portions is flush with the inner circumferential surface of the main body portion.

[0013] More preferably, the main body is formed with a plurality of oil holes penetrating in the radial direction.

[0014] The present invention also provides a dual clutch as follows, comprising:

[0015] Two clutch assemblies, each of the clutch assemblies comprises an inner hub, an outer hub and a clutch unit located between the inner hub and the outer hub;

[0016] a centered slave cylinder, which is installed between the two clutch assemblies in the axial direction of the dual clutch and is used to control the engagement or disengagement of the clutch unit; and

[0017] The limit member for the dual clutch described in any one of the above technical solutions is located between the inner hubs of the two clutch assemblies in the axial direction and can be detachably installed on the inner hubs, so that the inner hubs of the two clutch assemblies and the limit member can be relatively fixed at least in the circumferential and radial directions of the dual clutch.

[0018] Preferably, the axial end surface of the inner hub opposite to the limit member is formed with a second engaging portion matching the first engaging portion of the limit member, and the second engaging portion is formed as a recessed portion recessed from the axial end surface or a protruding portion protruding from the axial end surface.

[0019] More preferably, the inner hub includes an inner sleeve, an outer sleeve located radially outside the inner sleeve, and a connecting portion for connecting the inner sleeve and the outer sleeve, the inner sleeve is formed with a spline for torsionally engaging with the shaft of the transmission, and the second engaging portion is formed on the inner sleeve.

[0020] More preferably, the centering slave cylinder is located radially outside the limiting member, and the centering slave cylinder is formed with an oil guide surface opposite to the oil hole of the limiting member.

[0021] The present invention also provides a preassembly method of a dual clutch as described in any one of the above technical solutions, the preassembly method comprising:

[0022] The centering slave cylinder and the dual clutch limiter are installed between the two clutch assemblies, and the first engaging portion of the dual clutch limiter is engaged with the second engaging portion of the inner hubs of the two clutch assemblies. The dual clutch limiter, the centering slave cylinder and the two clutch assemblies form a preassembled dual clutch in a coaxial manner. In the preassembled dual clutch, the dual clutch limiter is relatively fixed to the inner hubs of the two clutch assemblies and the splines of the inner hubs of the two clutch assemblies are aligned.

[0023] Preferably, the preassembly method further comprises:

[0024] A plurality of fixing members are mounted on the outer hubs of the two clutch assemblies, so that the outer hubs of the two clutch assemblies are relatively fixed at least in the axial direction and the circumferential direction.

[0025] More preferably, the fixing member comprises a main body and a plurality of fixing columns extending from the main body, and the fixing columns of the same fixing member extend into the holes of the outer hubs of the two clutch assemblies respectively.

[0026] The present invention also provides an assembly method of a dual-clutch transmission including any one of the above technical solutions, the assembly method comprising:

[0027] The centering slave cylinder and the double clutch stopper are installed between the two clutch assemblies, and the first engaging portion of the double clutch stopper is engaged with the second engaging portion of the inner hubs of the two clutch assemblies, the double clutch stopper, the centering slave cylinder and the two clutch assemblies form a preassembled double clutch in a coaxial manner, in which the double clutch stopper and the inner hubs of the two clutch assemblies are relatively fixed and the splines of the inner hubs of the two clutch assemblies are aligned; and

[0028] The transmission mechanism including the preassembled dual clutch is mounted on the shaft of the transmission so that the inner hubs of the two clutch assemblies and the stopper are fitted on the shaft.

[0029] Preferably, the preassembled dual clutch is a dual clutch preassembled using the preassembly method described in any one of the above technical solutions.

[0030] More preferably, the assembling method further comprises:

[0031] After mounting the preassembled dual clutch to the shaft of the transmission, the retainer is removed from the outer hubs of the two clutch assemblies.

[0032] By adopting the above technical solution, the present invention provides a limiter for a dual clutch, a dual clutch including the limiter, and a preassembly method thereof. In the dual clutch, the cylindrical limiter can fix the inner hub of the dual clutch relative to the limiter at least in the radial and circumferential directions of the dual clutch, thereby avoiding the spline misalignment of the inner hubs of the two clutch assemblies and the misalignment of the inner hubs with the connecting sleeve in the dual clutch in the preassembly state. In this way, in the assembly method of the transmission including the above dual clutch, the limiter is used to avoid the spline misalignment of the inner hubs of the two clutch assemblies in the dual clutch in the preassembly state and the misalignment of the inner hubs with the connecting sleeve, thereby eliminating the problem that the dual clutch cannot be smoothly installed on the shaft of the transmission due to these unfavorable conditions, making the installation process of the dual clutch easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 1 is a schematic cross-sectional view showing a dual clutch according to an embodiment of the present invention in a pre-assembled state.

[0034] Figure 2a It shows Figure 1 A schematic diagram of the three-dimensional structure of the first inner hub of the dual clutch; Figure 2b It shows Figure 1 A schematic diagram of the three-dimensional structure of the second inner hub of the dual clutch; Figure 2c It shows Figure 1 A schematic diagram of the three-dimensional structure of the limiter of the dual clutch; Figure 2d It shows Figure 1 Schematic diagram of the three-dimensional structure of the fixing parts of the dual clutch.

[0035] Description of Reference Numerals

[0036] 1 first clutch assembly 11 first inner hub 111 first inner sleeve 111c first recessed portion 112 first outer sleeve 113 first connecting portion 12 first outer hub 13 first clutch unit

[0037] 2 second clutch assembly 21 second inner hub 211 second inner sleeve 211c second recessed portion 212 second outer sleeve 213 second connecting portion 22 second outer hub 23 second clutch unit

[0038] 3 Centered slave cylinder 31 housing 31s oil guide surface 32 piston 33 bearing 34 preload spring

[0039] 4 Limiting member 41 Main body 41h Oil hole 42 Protruding part

[0040] The fixing member 51 includes a main body portion 52 and a fixing column 53 and a holding portion.

[0041] A is axial and R is radial. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not intended to exhaust all possible modes of the present invention, nor to limit the scope of the present invention.

[0043] In the present invention, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the dual clutch according to the present invention, respectively; "axial side" refers to Figure 1 The left side of the axis refers to Figure 1 In addition, "pre-assembly" or "pre-assembly state" refers to a state in which the components of the dual clutch according to the present invention have been assembled to each other and can be integrally assembled to the shaft of the transmission.

[0044] (Structure of a dual clutch according to one embodiment of the present invention)

[0045] like Figure 1 As shown, the dual clutch according to the present invention comprises two clutch assemblies (a first clutch assembly 1 and a second clutch assembly 2 ), a centered slave cylinder 3 , a limiter 4 and a plurality of fixing members 5 .

[0046] Specifically, in this embodiment, the first clutch assembly 1 is located on one axial side of the centered slave cylinder 3 ( Figure 1 ), and includes a first inner hub 11, a first outer hub 12, and a first clutch unit 13 located between the first inner hub 11 and the first outer hub 12, which are assembled together.

[0047] like Figure 2aAs shown, the first inner hub 11 includes a first inner sleeve 111, a first outer sleeve 112, and a first connecting portion 113 located between the first inner sleeve 111 and the first outer sleeve 112, which are formed as one body. The first inner sleeve 111 and the second outer sleeve 112 are both formed in a cylindrical shape and the first outer sleeve 112 is located radially outside the first inner sleeve 111. The first connecting portion 113 is formed in a circular ring shape and is used to connect the first inner sleeve 111 and the first outer sleeve 112. The inner circumference of the first inner sleeve 111 is formed with a spline for torsionally coupling with, for example, a shaft of a transmission. Further, in order to connect the first inner hub 11 and the stopper 4 in a relatively fixed manner in the circumferential direction and the radial direction R, two first recessed portions 111c are formed on the axial end surface of the first inner hub 11 facing the stopper 4, and each first recessed portion 111c is further extended radially outward to the outer peripheral surface of the first inner hub 11, so that the first recessed portion 111c is open on the outer peripheral surface of the first inner hub 11. The two first recessed portions 111c are arranged on the first inner hub 11 in a manner of being spaced 180 degrees from each other at a central angle.

[0048] The first outer hub 12 half surrounds the first inner hub 11 from the radial outer side and the axial side. The outer periphery of the first outer hub 12 may be formed with a plurality of lubricating oil holes for lubricating oil to enter / exhaust the first clutch unit 13 of the first clutch assembly 1, and the plurality of lubricating oil holes are arranged along the circumference of the dual clutch. In this embodiment, some of the lubricating oil holes are used as holes for matching with the fixing columns of the fixing member 5.

[0049] The first clutch unit 13 includes friction discs and pressure plates which are respectively disposed at the opposite portions of the first inner hub 11 and the first outer hub 12 and are alternately arranged in the axial direction A. When the friction disc and the pressure plate are engaged under the force applied by the centering slave cylinder 3, the first clutch unit 13 is engaged; when the friction disc and the pressure plate are separated after the force applied by the centering slave cylinder 3 is removed, the first clutch unit 13 is separated.

[0050] In this embodiment, the second clutch assembly 2 is located on the other axial side of the centered slave cylinder 3 ( Figure 1 ). Similar to the structure of the first clutch assembly 1, the second clutch assembly 2 includes a second inner hub 21, a second outer hub 22, and a second clutch unit 23 located between the second inner hub 21 and the second outer hub 22.

[0051] like Figure 2bAs shown, similar to the structure of the first inner hub 11, the second inner hub 21 includes a second inner sleeve 211, a second outer sleeve 212, and a second connecting portion 213 located between the second inner sleeve 211 and the second outer sleeve 212. The second inner sleeve 211 and the second outer sleeve 212 are both formed in a cylindrical shape and the second outer sleeve 212 is located radially outside the second inner sleeve 211. The second connecting portion 213 is formed in a circular ring shape and is used to connect the second inner sleeve 211 and the second outer sleeve 212. The inner circumference of the second inner sleeve 211 is formed with a spline for torsionally connecting with a shaft of, for example, a transmission. Further, in order to connect the second inner hub 21 and the stopper 4 in a relatively fixed manner in the circumferential direction and the radial direction R, two second recessed portions 211c are formed on the axial end surface of the second inner hub 21 facing the stopper 4, and each second recessed portion 211c is further extended radially outward to the outer peripheral surface of the second inner hub 21, so that the second recessed portion 211c is open on the outer peripheral surface of the second inner hub 21. The two second recessed portions 211c are arranged on the second inner hub 21 in a manner of being spaced 180 degrees from each other at a central angle.

[0052] The second outer hub 22 half surrounds the second inner hub 21 from the radial outer side and the other axial side. The outer periphery of the second outer hub 22 may be formed with a plurality of lubricating oil holes for lubricating oil to enter / exhaust the clutch unit of the clutch assembly, and the plurality of lubricating oil holes are arranged along the circumference of the dual clutch. In this embodiment, some of the lubricating oil holes are used as holes for matching with the fixing columns of the fixing member 5.

[0053] The second clutch unit 23 includes friction discs and pressure plates which are respectively disposed at the opposite portions of the second inner hub 21 and the second outer hub 22 and are alternately arranged in the axial direction A. When the friction discs and the pressure plates are engaged under the force applied by the centering slave cylinder 3, the second clutch unit 23 is engaged; when the friction discs and the pressure plates are separated after the force applied by the centering slave cylinder 3 is removed, the second clutch unit 23 is separated.

[0054] In the present embodiment, in the dual clutch in the pre-assembled state, the centered slave cylinder 3 is located between the two clutch assemblies 1 and 2 in the axial direction A. The centered slave cylinder 3 includes a housing 31, a piston 32 mounted in a mounting recess formed in the housing 31, a bearing 33, and a preload spring 34. In this way, the preload spring 34 applies a spring force to the two clutch assemblies 1 and 2 located on both sides via the piston 32 and the bearing 33.

[0055] In this embodiment, if Figure 2cAs shown, the stopper 4 includes a main body 41 and four protrusions 42 formed as one body. The main body 41 is formed in a cylindrical shape, and the central through hole of the main body 41 is used for the shaft of the transmission to pass through. The outer peripheral surface of each protrusion 42 is flush with the outer peripheral surface of the main body 41, two protrusions 42 are arranged on the axial end surface of the main body 41 opposite to the first inner hub 11 and protrude in the axial direction, and the other two protrusions 42 are arranged on the axial end surface of the main body 41 opposite to the second inner hub 21 and protrude in the axial direction. On one axial side end face of the main body 41, two protrusions 42 are arranged at an interval of 180 degrees at a central angle of circle, and the position and shape of each protrusion 42 match the position and shape of the first recessed portion 111c of the first inner hub 11, so that the two protrusions 42 can be matched and engaged with the first recessed portion 111c of the first inner hub 11, thereby making the first inner hub 11 relatively fixed to the limit member 4 in a coaxial manner in the circumferential direction and radial direction R; on the other axial side end face of the main body 41, two protrusions 42 are arranged at an interval of 180 degrees at a central angle of circle, and the position and shape of each protrusion 42 match the position and shape of the second recessed portion 211c of the second inner hub 21, so that the two protrusions 42 can be matched and engaged with the second recessed portion 211c of the second inner hub 21, thereby making the second inner hub 21 relatively fixed to the limit member 4 in a coaxial manner in the circumferential direction and radial direction R. By relatively fixing the first inner hub 11 and the second inner hub 21 through the limit member 4 as described above, the splines of the first inner hub 11 and the splines of the second inner hub 21 can be aligned, thereby facilitating the installation of the splines of the first inner hub 11 and the second inner hub 21 to the part of the shaft of the transmission where the corresponding splines are formed.

[0056] In addition, two oil holes 41h are formed in the central part of the body 41 in the axial direction A and penetrate in the radial direction R, so that the lubricating oil from the shaft of the transmission can pass through the two oil holes 41h. Further, the lubricating oil passing through the oil holes 41h reaches the oil guide surface 31s of the housing 31 of the central slave cylinder 3 under the action of centrifugal force. The oil guide surface 31s extends from the portion of the housing 31 of the central slave cylinder 3 opposite to the oil hole 41h toward both sides of the axial direction and extends obliquely toward the radial outside, so that the lubricating oil can be guided to the first clutch unit 13 and the second clutch unit 23 respectively through the guidance of the oil guide surface 31s.

[0057] In this embodiment, the plurality of fixing members 5 are evenly distributed in the circumferential direction. Figure 2dAs shown, each fixing member 5 includes a main body 51 and a plurality of fixing columns 52. The main body 51 is also formed with a retaining portion 53 in the form of a hole, so as to retain the fixing member 5 when installing and removing the fixing member 5. Two rows of fixing columns 52 are fixed to the main body 51 and are respectively inserted into the holes of the outer hubs 12 and 22 of the two clutch assemblies 1 and 2, and the main body 51 of each fixing member 5 is closely attached to the outer contour of the corresponding part of the dual clutch, so that the plurality of fixing members 5 can be detachably mounted on the two clutch assemblies 1 and 2 of the dual clutch, so that the two clutch assemblies 1 and 2 of the dual clutch and the centering slave cylinder 3 located between the two clutch assemblies 1 and 2 can be relatively fixed in the axial direction A and circumferential direction of the dual clutch. When the fixing member 5 fixes the outer hubs 12 and 22 of the two clutch assemblies 1 and 2 axially relative to each other, the two clutch assemblies 1 and 2 can respectively apply corresponding axial preload forces to the preload spring 34 in the centering slave cylinder 3, so that the two clutch assemblies 1 and 2 and the centering slave cylinder 3 can be installed together in a manner of preloading a certain axial force, thereby fixing the axial size of the preloaded dual clutch, facilitating the subsequent installation, calibration and matching of the preloaded dual clutch in the gearbox. The fixing member 5 cooperates with the limiter 4 to ensure that the dual clutch is kept in the pre-assembled state.

[0058] (Pre-assembly method of a dual clutch according to an embodiment of the present invention and assembly method of a transmission according to the present invention including the dual clutch)

[0059] The present invention also provides a preassembly method of a dual clutch according to an embodiment of the present invention and an assembly method of a transmission including the dual clutch. The preassembly method includes the following steps.

[0060] The centering slave cylinder 3 and the double clutch stopper 4 are installed between the two clutch assemblies 1 and 2, and the protruding portion 42 of the double clutch stopper 4 is engaged with the recessed portions 111c and 211c of the inner hubs 11 and 12 of the two clutch assemblies 1 and 2, so that the double clutch stopper 4, the centering slave cylinder 3 and the inner hubs 11 and 12 form a preassembled double clutch assembly in a coaxial manner, in which the double clutch stopper 4 is relatively fixed to the inner hubs 11 and 21 of the two clutch assemblies 1 and 2, and the splines of the inner hubs 11 and 21 of the two clutch assemblies 1 and 2 are aligned. Further, a plurality of fixing members 5 are installed to the outer hubs 12 and 22 of the two clutch assemblies 1 and 2, so that the outer hubs 12 and 22 of the two clutch assemblies 1 and 2 are relatively fixed in the axial direction A and the circumferential direction, so that the entire double clutch is surely kept in a preassembled state.

[0061] After obtaining the dual clutch in the pre-assembled state based on the above dual clutch pre-assembly method, the assembly method of the transmission according to the present invention including the dual clutch further includes the following steps: installing the transmission mechanism including the dual clutch in the pre-assembled state onto the shaft of the transmission, so that the inner hubs 11, 21 and the stopper 4 of the two clutch assemblies 1, 2 are fitted onto the shaft of the transmission. At this time, the splines of the inner hubs 11, 21 are meshed with the corresponding splines of the shaft of the transmission, so that the inner hubs 11, 21 are torsionally connected to the shaft of the transmission.

[0062] In this way, by using the above-mentioned assembly method, the difficulties caused by the problems described in the background technology in assembling the dual clutch to the shaft of the transmission can be avoided, making the assembly convenient and easy.

[0063] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present invention. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present invention without departing from the scope of the present invention. In addition, the following supplementary explanations are provided.

[0064] (i) Although the above specific embodiments illustrate that the stopper 4 forms a protruding portion 42 (as the first engaging portion of the stopper) and the two inner hubs 11, 21 form recessed portions 111c, 211c (as the second engaging portion of the inner hub), the present invention is not limited thereto. For example, the following alternative scheme may be adopted, where the stopper 4 forms a recessed portion as the first engaging portion and the two inner hubs 11, 21 may form a protruding portion as the second engaging portion.

[0065] In addition, examples of the protrusion 42 include but are not limited to a column, a hook, a block, a strip, etc., and the recessed portions 111c and 211c can be formed into any desired shape.

[0066] Furthermore, the number of the protrusions 42 and the recesses 111 c , 211 c is not limited to the number described in the above specific embodiments, but any number of the protrusions 42 and the recesses 111 c , 211 c may be provided as required.

[0067] Preferably, on either axial side of the main body 41 , the protrusions 42 or the recesses 111 c , 211 c are evenly distributed along the circumference of the main body 41 .

[0068] It should be understood that the recessed portions 111c and 211c in the present application are not limited to being open on the outer circumference of the inner sleeve 111 and 211, but can be open on the inner circumference of the inner sleeve 111 and 211. In this case, the protrusion 42 can be formed on the inner circumference of the main body 41.

[0069] In addition, the recessed portion 111c, 211c can also be a recessed portion (i.e., a blind hole) recessed inward from the axial end surface of the inner sleeve 111, 211. In this case, the recessed portion 111c, 211c is not open on both the outer circumference and the inner circumference of the inner sleeve 111, 211. The protrusion 42 can be formed at the radial center of the body portion 41.

[0070] (ii) Although not explicitly stated in the above specific embodiments, it can be understood that after the pre-assembled dual clutch is successfully installed on the shaft of the transmission, the limiter 4 is mounted on the shaft to axially limit the inner hubs 11, 21 of the two clutch assemblies 1, 2, but the fixing member 5 can be removed in the final stage of the transmission assembly method, so that the removed fixing member 5 can be reused for the dual clutch of the same type.

Claims

1. A limiter for a dual clutch, the limiter (4) comprising: A main body (41), wherein the main body (41) is formed in a cylindrical shape; as well as A plurality of first engaging portions, wherein the plurality of first engaging portions are arranged on a portion of the main body (41) for being opposite to the inner hubs (11, 21) of the two clutch assemblies (1, 2) of the dual clutch, and are capable of matching and engaging with the second engaging portions of the inner hubs (11, 21), so that the inner hubs of the two clutch assemblies (1, 2) are relatively fixed to the limit member (4) in a coaxial manner at least in the circumferential direction and radial direction (R) of the dual clutch.

2. The dual clutch limiter according to claim 1, characterized in that: On either axial side of the main body (41), the first engaging portion is axially extendingly arranged and evenly distributed along the circumference of the main body (41).

3. The dual clutch limiter according to claim 1 or 2, characterized in that: The first engaging portion is a protruding portion (42) protruding from the axial end surface of the main body portion (41), and at least two protruding portions (42) are provided on either axial side of the main body portion (41); and / or The first engaging portion is a recessed portion recessed from the axial end surface of the main body portion (41), and at least two recessed portions are provided on either axial side of the main body portion (41).

4. The dual clutch limiter (4) according to claim 3, characterized in that: The outer circumferential surface of each of the protruding portions (42) or the recessed portions is flush with the outer circumferential surface of the main body portion (41) and / or the inner circumferential surface of each of the protruding portions (42) or the recessed portions is flush with the inner circumferential surface of the main body portion (41).

5. The dual clutch limiter according to claim 1 or 2, characterized in that: The main body (41) is formed with a plurality of oil holes (41h) penetrating in the radial direction (R).

6. A dual clutch, comprising: Two clutch assemblies (1, 2), each of the clutch assemblies (1, 2) comprising an inner hub (11, 21), an outer hub (12, 22), and a clutch unit (13, 23) located between the inner hub (11, 21) and the outer hub (12, 22); A centered slave cylinder (3), which is installed between the two clutch assemblies (1, 2) in the axial direction (A) of the dual clutch and is used to control the engagement or disengagement of the clutch unit (13, 23); as well as The limit member (4) for a dual clutch according to any one of claims 1 to 5, wherein the limit member (4) is located between the inner hubs (11, 21) of the two clutch assemblies (1, 2) in the axial direction (A) and can be detachably mounted on the inner hubs (11, 21), so that the inner hubs (11, 21) of the two clutch assemblies (1, 2) and the limit member (4) can be relatively fixed at least in the circumferential direction and radial direction (R) of the dual clutch.

7. The dual clutch according to claim 6, characterized in that: The axial end surface of the inner hub (11, 21) opposite to the limiting member (4) is formed with a second engaging portion matching the first engaging portion of the limiting member (4), and the second engaging portion is formed as a recessed portion (111c, 211c) recessed from the axial end surface or a protruding portion protruding from the axial end surface.

8. The dual clutch according to claim 6 or 7, characterized in that: The inner hub (11, 21) comprises an inner sleeve (111, 211), an outer sleeve (112, 212) located radially outside the inner sleeve (111, 211), and a connecting portion (113, 213) for connecting the inner sleeve (111, 211) and the outer sleeve (112, 212), the inner sleeve (111, 211) being formed with a spline for torsionally engaging with a shaft of a transmission, and the second engaging portion being formed on the inner sleeve (111, 211).

9. The dual clutch according to claim 6 or 7, characterized in that: The centering slave cylinder (3) is located radially outside the limiting member (4), and the centering slave cylinder (3) is formed with an oil guide surface (31s) opposite to the oil hole (4h) of the limiting member (4).

10. A method for preassembling a dual clutch according to any one of claims 6 to 9, the method comprising: The centering slave cylinder (3) and the dual clutch stopper (4) are installed between the two clutch assemblies (1, 2), and the first engaging portion of the dual clutch stopper (4) is engaged with the second engaging portion of the inner hubs (11, 21) of the two clutch assemblies (1, 2). The dual clutch stopper (4), the centering slave cylinder (3) and the two clutch assemblies (1, 2) form a preassembled dual clutch in a coaxial manner. In the preassembled dual clutch, the dual clutch stopper (4) and the inner hubs (11, 21) of the two clutch assemblies (1, 2) are relatively fixed and the splines of the inner hubs (11, 21) of the two clutch assemblies (1, 2) are aligned.

11. The preassembly method according to claim 10, characterized in that: The pre-assembly method further comprises: A plurality of fixing members (5) are mounted on the outer hubs (12, 22) of the two clutch assemblies (1, 2), so that the outer hubs (12, 22) of the two clutch assemblies (1, 2) are relatively fixed at least in the axial and circumferential directions.

12. The preassembly method according to claim 11, characterized in that: The fixing member (5) comprises a main body (51) and a plurality of fixing columns (52) extending from the main body (51), and the fixing columns (52) of the same fixing member (5) extend into holes of the outer hubs (12, 22) of the two clutch assemblies (1, 2) respectively.

13. A method for assembling a transmission comprising a dual clutch according to any one of claims 6 to 9, the method comprising: The centering slave cylinder (3) and the dual clutch stopper (4) are installed between the two clutch assemblies (1, 2), and the first engaging portion of the dual clutch stopper (4) is engaged with the second engaging portion of the inner hubs (11, 21) of the two clutch assemblies (1, 2). The dual clutch stopper (4), the centering slave cylinder (3) and the two clutch assemblies (1, 2) form a preassembled dual clutch in a coaxial manner. In the preassembled dual clutch, the dual clutch stopper (4) and the inner hubs (11, 21) of the two clutch assemblies (1, 2) are relatively fixed and the splines of the inner hubs (11, 21) of the two clutch assemblies (1, 2) are aligned. as well as A transmission mechanism including a preassembled dual clutch is mounted on a shaft of a transmission so that the inner hubs (11, 21) of the two clutch assemblies (1, 2) and the stopper (4) are sleeved on the shaft.

14. The assembly method according to claim 13, characterized in that: The preassembled dual clutch is a dual clutch preassembled using the preassembly method according to claim 11 or 12.

15. The assembly method according to claim 14, characterized in that: The assembly method further comprises: After mounting the preassembled dual clutch to the shaft of the transmission, the fixing member (5) is removed from the outer hubs (12, 22) of the two clutch assemblies (1, 2).

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