CN219432310U - Double clutch with inner and outer layer structure - Google Patents

Abstract

The utility model relates to a double clutch with an inner layer structure and an outer layer structure, which is characterized in that: the clutch comprises a normally closed clutch and a normally open clutch, wherein the normally closed clutch is in linkage with the normally open clutch; the left side of a normally closed clutch drum of the normally closed clutch is provided with at least two axially concave groove parts, the concave groove parts are processed into a step shape, namely stepped groove parts are formed, the stepped groove parts are wide on the left and narrow on the right, the concave groove parts and the stepped groove parts are uniformly distributed in the circumferential direction of the normally closed clutch drum, and a convex part of the normally closed clutch is formed by a non-concave part on the left side of the normally closed clutch drum; the double clutch with the inner and outer layer structure enables the two clutches to be nested inside and outside, so that the axial size is reduced, and the space utilization is more reasonable.

Description

Double clutch with inner and outer layer structure

Technical Field

The utility model relates to the field of clutches, in particular to the field of double clutches with inner and outer layer structures.

Background

In the traditional clutch field, one clutch corresponds to one actuator, and the separation and combination actions of the two clutches are controlled respectively, so that the two actuators are large in size, high in cost, high in energy consumption and complex in structure, in order to ensure smooth and rapid gear shifting process and not to interrupt power, the control difficulty is high, friction plate abrasion is serious and even burning is caused by the fact that the two clutches are combined simultaneously due to the influence of factors, along with the development of a new energy automobile, the technology of controlling the two clutches by one actuation is developed, one actuator is used for controlling the two clutches simultaneously, one actuator is reduced, the cost is reduced, the size is reduced, the problem of gear shifting process is effectively solved, but the existing one-control-two technology has the advantages of being complex in structure and high in manufacturing difficulty, the two clutches are distributed left and right in a large number, the axial space occupation is large, and the problem of full play of volume optimization is not achieved.

A mechanical rigid-flexible gear shifting device as disclosed in chinese patent publication No. CN106958651a, which comprises: the mechanical rigid-flexible gear shifting device is characterized by comprising a duplex gear, a clutch housing, friction plates, tooth-shaped gaskets, springs, a spline seat, a push column seat, nuts, a gear shifting direct current motor, a spline shaft, the duplex gear and an integrated screw gear, wherein the mechanical rigid-flexible gear shifting device is used for controlling different contact or movement relations between two groups of friction plates and the tooth-shaped gaskets and between two groups of duplex gears and the spline seat through the rotation direction of the gear shifting direct current motor, so that input torque sources are switched, and torque output is performed in different output forms in parallel connection and series connection.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide a dual clutch with an inner and outer layer structure, which allows two clutches to be nested inside and outside, thereby reducing the axial dimension and making more reasonable space utilization.

The double clutch with an inner layer structure and an outer layer structure is characterized in that: the clutch comprises a normally closed clutch and a normally open clutch, wherein the normally closed clutch is in linkage with the normally open clutch;

the left side of a normally closed clutch drum of the normally closed clutch is provided with at least two axially concave groove parts, the concave groove parts are processed into a step shape, namely stepped groove parts are formed, the stepped groove parts are wide on the left and narrow on the right, the concave groove parts and the stepped groove parts are uniformly distributed in the circumferential direction of the normally closed clutch drum, and a convex part of the normally closed clutch is formed by a non-concave part on the left side of the normally closed clutch drum;

the left side of the normally closed clutch drum is provided with a pressing plate, the left side of the pressing plate is provided with a supporting plate, the pressing plate is provided with a first hole part corresponding to the convex part of the normally closed clutch drum, the pressing plate can be sleeved at the rightmost end of the concave groove part of the normally closed clutch drum through the first hole part to realize the sliding connection of the pressing plate and the normally closed clutch drum, the supporting plate is provided with a second hole part corresponding to the convex part of the normally closed clutch drum, the supporting plate can be sleeved at the stepped groove part of the normally closed clutch drum through the second hole part, the supporting plate is limited by the stepped groove part and can not move right continuously, the left side of the supporting plate on the normally closed clutch drum is provided with a clamping spring to limit the axial relative movement of the supporting plate and the normally closed clutch drum,

first elastic bodies which are uniformly distributed along the circumference are arranged between the pressure plate and the supporting piece, two ends of the first elastic bodies are respectively abutted against the pressure plate and the supporting piece,

the right side of the pressure plate and positioned in the normally closed clutch drum are provided with a first friction pair, the first friction pair comprises a plurality of first outer plates and first inner plates, the plurality of first outer plates and the first inner plates are arranged in a staggered mode, the outer periphery of the first outer plates is in sliding connection with a first spline groove of the normally closed clutch drum through a spline, and the inner periphery of the first inner plates is in sliding connection with the normally closed clutch hub through a spline;

the outer periphery of the normally closed clutch drum and the right side of the pressing disc are provided with normally open clutches, each normally open clutch comprises a normally open clutch drum and a normally open clutch hub, each normally open clutch hub is integrated with the normally closed clutch drum, namely, a second spline groove is formed in the outer periphery of the normally closed clutch drum, a second friction pair is arranged between the normally open clutch drum and the normally open clutch hub, each second friction pair comprises a plurality of second outer sheets and second inner sheets, the plurality of second outer sheets and the second inner sheets are arranged in a staggered mode, the outer periphery of each second outer sheet is in sliding connection with the normally open clutch drum through a spline, and the inner periphery of each second inner sheet is in sliding connection with the second spline groove of the normally open clutch hub through a spline.

Further, the actuator, the push disc, the friction plate and the baffle are sequentially arranged in the normally open clutch drum from left to right, the baffle is fixedly connected with the normally open clutch drum, the push disc is in sliding connection with the baffle through an inner peripheral spline, a return spring is arranged between the baffle and the piston, the normally closed clutch is arranged on the right side of the friction plate in the normally open clutch drum, the friction plate is fixed on the left side surface of the supporting plate, and the dual-plate push disc of the friction plate is in sliding connection with the normally open clutch drum through the baffle.

Further, the support plate is partially provided in the normally closed clutch drum and partially provided on the outer periphery of the normally closed clutch drum.

Further, the support plates are all arranged in the normally closed clutch drum, tooth-shaped convex parts are arranged on the periphery of the support plates, the tooth-shaped convex parts are connected with the normally closed clutch drum, and meanwhile, a first elastic body is not arranged on the periphery of the normally closed clutch drum.

Further, the first elastic body is one or two of a compression spring, a belleville spring, a diaphragm spring or a wave spring.

Further, the first elastic body is all arranged between the inner pressure plate and the supporting plate of the normally closed clutch drum, or all arranged between the outer peripheral pressure plate and the supporting plate of the normally closed clutch drum, or partially arranged between the inner pressure plate and the supporting plate of the normally closed clutch drum, and partially arranged between the outer peripheral pressure plate and the supporting plate of the normally closed clutch drum.

Further, the normally closed clutch hub and the normally open clutch drum are made into an integrated structure, and the normally closed clutch drum and the normally open clutch hub are made into a separate structure.

Further, the normally closed clutch and the normally open clutch are one of a multi-plate wet clutch, a dry clutch or a compound clutch.

The utility model has the beneficial effects that:

1. the normally closed clutch drum and the normally open clutch hub are integrally formed, so that the parts are reduced, the cost is reduced, and the volume is reduced;

2. the inner and outer nesting of the two clutches reduces the axial dimension, the space utilization is more reasonable, the arrangement of the pressure plate and the supporting plate can extend from the inside of the normally closed clutch drum to the periphery of the normally closed clutch drum, the number of the first elastic bodies can be increased, the length of the first elastic bodies is shortened, and the axial dimension of the double clutch is further reduced;

3. the two clutches can be respectively processed and installed, so that the quality control is convenient, and the manufacturing efficiency is improved;

4. one actuator controls two clutches to save cost, save energy, reduce cost and reduce volume;

5. the actuator can control two clutches simultaneously by only providing axial acting force of one clutch, thereby further saving cost and energy sources

6. The clutch is easy to control, quick and smooth gear shifting is easy to realize, the gear shifting process is unpowered and interrupted, and the clutch is prevented from being separated simultaneously and is combined with a foolproof effect simultaneously.

Description of the drawings:

FIG. 1 is a schematic cross-sectional view of an embodiment of the present utility model;

FIG. 2 is a partial view of FIG. 1;

FIG. 3 is a schematic perspective view of the normally closed clutch drum of FIG. 1;

FIG. 4 is a front view of the platen of FIG. 1;

FIG. 5 is a front view of the support sheet of FIG. 1;

FIG. 6 is a schematic cross-sectional construction of another embodiment of the present utility model (dual clutch structure with the support plates all disposed within the normally closed clutch drum);

FIG. 7 is a partial view of FIG. 6;

FIG. 8 is a schematic view of the front elevational configuration of the support plate of FIG. 7 disposed only within the normally closed clutch drum;

FIG. 9 is a schematic cross-sectional construction of another embodiment of the present utility model (normally closed clutch hub integrated with normally open clutch drum);

fig. 10 is a partial view of fig. 9.

The specific embodiment is as follows:

the utility model relates to a double clutch with an inner and outer layer structure, which comprises a normally closed clutch A and a normally open clutch B, wherein the two clutches are in an inner and outer distribution structure, a normally closed clutch drum and a normally open clutch hub are integrated or are integrated, preferably, the normally closed clutch drum and the normally open clutch hub are integrated, the two clutches are interlocked and interlocked, the interlocking and interlocking mode is that an actuator controls the separation and combination of the two clutches, and when the normally closed clutch is separated, the normally open clutch is combined; in contrast, the normally closed clutch is engaged and the normally open clutch is disengaged, and the decrease in the normally closed clutch engagement force is equal to the pressure of the normally open clutch during the normally closed clutch disengagement, and the increase in the normally closed clutch engagement force is equal to the decrease in the normally open clutch pressure during the normally closed clutch engagement.

The normally closed clutch and the normally open clutch can be one of a multi-plate wet clutch, a dry clutch, a compound clutch and other types of clutches, and preferably, the normally closed clutch and the normally open clutch are simultaneously multi-plate wet clutches.

Specifically, as shown in fig. 1-5, the normally-closed clutch a comprises a normally-closed clutch drum A1 and a normally-closed clutch hub A2, two or more axially concave groove portions a102 are formed on the left side of the normally-closed clutch drum, wherein two or more concave groove portions are processed into a step shape to form a step-shaped groove portion a103, the step-shaped groove portions are wide in left and narrow in right, the two or more concave groove portions are symmetrically distributed or uniformly distributed, the two or more concave step-shaped groove portions are symmetrically or uniformly distributed, and a non-concave portion on the left side of the normally-closed clutch drum is a normally-closed clutch convex portion.

The pressure plate 1 is arranged on the left side of the normally closed clutch drum A1, the support plate 6 is arranged on the left side of the pressure plate, a first hole part 101 corresponding to the convex part of the normally closed clutch drum is formed in the pressure plate 1, the pressure plate can be sleeved at the rightmost end of the concave groove part of the normally closed clutch drum through the first hole part 101, the pressure plate is in sliding connection with the normally closed clutch drum, the pressure plate can move leftwards from the rightmost end of the concave groove part of the normally closed clutch drum, a second hole part 601 corresponding to the convex part of the normally closed clutch drum is formed in the support plate 6, the support plate can be sleeved at the step groove part A103 of the normally closed clutch drum through the second hole part, the support plate cannot move rightwards under the limitation of the step groove part, and the clamp spring 7 is arranged on the normally closed clutch drum on the left side of the support plate so as to limit the axial relative movement of the support plate and the normally closed clutch drum, and the normally closed clutch drum cannot move relatively, and the normally closed clutch drum can be driven to move leftwards synchronously through the support plate, as shown in fig. 1, the pressure plate and the support plate are both provided with parts at the inner periphery of the normally closed clutch drum, and the normally closed clutch drum are partially arranged at the periphery.

The pressure plate and the support plate are provided with the first elastic body 2, the first elastic body can be one or a plurality of compression springs, belleville springs, diaphragm springs, wave springs or other elastic materials, preferably the compression springs are provided with a plurality of compression springs, the plurality of compression springs are uniformly distributed or symmetrically distributed between the support plate and the pressure plate along the circumference, two ends of the first elastic body 2 are respectively abutted against the pressure plate 1 and the support plate 6, the plurality of first elastic bodies can be all arranged between the pressure plate and the support plate in the normally closed clutch drum, can also be all arranged between the pressure plate and the support plate at the periphery of the normally closed clutch drum, can also be partially arranged between the pressure plate and the support plate in the normally closed clutch drum, and is partially arranged between the pressure plate and the support plate at the periphery of the normally closed clutch drum, preferably the normally closed clutch drum and the periphery of the normally closed clutch drum are all provided with the first elastic bodies so as to conveniently set more first elastic bodies to meet the transmission requirement of the normally closed clutch, shorten the length of the first elastic bodies and further shorten the axial length of the double clutch.

Alternatively, the support plates are all disposed in the normally-closed clutch drum, and the tooth-shaped projections 202 are provided on the outer periphery of the support plates all disposed in the normally-closed clutch drum, and are connected to the normally-closed clutch drum (as shown in fig. 6, 7, 8), and accordingly, the normally-closed clutch drum is not provided with an elastic body on the outer periphery.

Be provided with first friction pair 3 in the pressure plate right side normally closed clutch drum, first friction pair 3 includes a plurality of first outer pieces 4 and first interior piece 5, and a plurality of first outer pieces and first interior piece crisscross setting, first outer piece 4 periphery pass through spline and normally closed clutch drum first spline groove A101 sliding connection, and first interior piece 5 inner periphery passes through spline and normally closed clutch hub A2 sliding connection.

The outer periphery of the normally closed clutch drum and the right side of the pressing disc are provided with a normally open clutch B, the normally open clutch B comprises a normally open clutch drum B1 and a normally open clutch hub B2, the normally open clutch hub and the normally closed clutch drum are integrated, namely, a second spline groove B201 is formed in the outer periphery of the normally closed clutch drum, a second friction pair 8 is arranged between the normally open clutch drum and the normally open clutch hub, the second friction pair 8 comprises a plurality of second outer sheets 9 and a second inner sheet 10, the plurality of second outer sheets and the second inner sheets are arranged in a staggered mode, the outer periphery of the second outer sheets is in sliding connection with the normally open clutch drum B1 through a spline, and the inner periphery of the second inner sheet 10 is in sliding connection with the second spline groove B201 through a spline.

The actuator C, the push disc 13, the friction plate 14 and the baffle 15 are sequentially arranged in the normally open clutch drum from left to right, most of the actuators are suitable for the application, such as a hydraulic piston structure, a pneumatic piston structure, an electromagnetic structure, a motor driving screw rod structure and the like, preferably, the pneumatic piston structure is adopted, namely, the piston 12 is adopted, a piston cylinder 11 of the piston 12 is integrated with the normally open clutch drum B1, the push disc 13 is arranged on the right side of the piston and is opposite to the friction plate 14, the push disc is processed according to the requirement of the friction plate dual, the push disc 13 is in sliding connection with the baffle 15 through an inner peripheral spline, the baffle is fixedly connected with the normally open clutch drum B1, a return spring 16 is arranged between the baffle 15 and the piston 12, the normally closed clutch A is arranged on the right side of the friction plate 14 in the normally open clutch drum, the friction plate 14 is fixed on the left side of the supporting plate 6, and the dual plates (push disc) of the friction plate are in sliding connection with the normally open clutch drum B1 through the baffle 15, the motion state is identical to the second outer plate, and the friction plate and the dual plates (push disc) can be respectively regarded as part of the second friction plate pair.

The working principle of the utility model is as follows:

let the thrust of piston be F (changeable), max Fmax, under initial condition, compression spring (first elastomer 2) pressure be N1 (satisfy the pressure of transmission requirement), normally open clutch cohesion be N2 (satisfy the pressure of transmission requirement), the friction of each axial displacement spare of correlation and return spring's resistance are not counted, fmax > N1, fmax is not less than N2, in order to better prevent two clutches locking simultaneously, preferably, N2> N1.

1. The initial state is as follows: the actuator does not apply axial thrust to the push disc, the piston is at the leftmost position under the action of the return spring, the normally open clutch is not subjected to axial pressure and is in a separation state, the compression spring presses the second friction pair through the pressure plate on one hand, and the support plate, the clamp spring and the normally closed clutch drum press the first friction pair on the other hand, so that the normally closed clutch is in a combination state under the action of the compression spring, the normally closed clutch hub is synchronous with the normally closed clutch drum and the normally open clutch hub, and the normally open clutch is in a separation state;

2. in the resting state: the actuator applies axial force to the push disc, and pushes the friction plate, the supporting plate, the first elastic body and the pressure plate through the push disc, so that the second friction pair is pushed, the gap between the second friction pair is eliminated, and during the period, the clutch drum drives the normally-closed clutch to move right along with the supporting plate until the pressure plate is blocked by the second friction pair; then, the pressure of the actuator acting on the pushing disc gradually increases, the pressure acting on the supporting plate through the friction plate gradually increases, and the pressure acting on the supporting plate by part of the first elastic body is counteracted until all the first elastic body acts on the supporting plate, so that the pressure N1-F born by the first friction pair gradually decreases until the pressure is 0, namely F-N1=0, and correspondingly the pressure born by the second friction pair is F, namely the pressure born by the second friction pair gradually increases; after that, the pressure acting on the supporting plate is continuously increased, the pressure plate is limited by the second friction pair, the pressure plate cannot continuously move right, the supporting plate presses the compression spring and drives the normally closed clutch drum to continuously move right, a gap is formed between the first friction pairs in the process, the normally closed clutch drum is gradually separated, and correspondingly, the pressure acting on the second friction pair through the compression spring and the pressure plate is continuously increased along with the increase of F until F=fmax; at this time, the second friction pair is completely combined, i.e., the normally open clutch is combined, the normally open clutch drum is synchronized with the normally open clutch hub, and at this time, the normally closed clutch is completely separated.

3. During power transfer, the normally open clutch engagement is switched to the normally closed clutch engagement: under the condition that the normally-open clutch drum and the normally-open clutch hub are synchronous, and the normally-closed clutch drum and the normally-closed hub rotate relatively, gradually removing the axial thrust of the actuator, in the removing process, gradually reducing the pressure F of the pushing disc along with the clutch drum, correspondingly gradually reducing the pressure F of the second friction pair from Fmax to 0 along with the pressure F, and then gradually separating the second outer sheet and the second inner sheet under the action of an oil film; correspondingly, the support sheet drives the normally closed clutch drum to gradually move left under the action of the first elastomer, the right side of the normally closed clutch drum is gradually pressed towards the first friction pair, so that the gap between the first friction pair is gradually reduced, and the first friction pair is subjected to sliding grinding and combination, and the pressure of the normally closed clutch in the process is gradually increased from 0 to N1 according to the change rule of N1-F, so that the complete combination is realized; then under the action of a return spring, the piston moves to the leftmost position, and in the process of reducing the pressure of the second friction pair, the input torque is controlled in a certain range, so that the phenomenon of short-time 'galloping' caused by overlarge input torque is prevented, meanwhile, two clutches are simultaneously combined, a phenomenon of short-time locking is prevented, gear shifting is blocked, the two clutches can have simultaneous sliding and grinding time, and gear shifting smoothness from combination of a normally open clutch to combination of a normally closed clutch is realized by half-linkage power exchange;

4. during power transmission, the normally closed clutch engagement is switched to the normally open clutch engagement: under the condition that the normally closed clutch drum and the normally closed clutch hub are synchronous, the actuator applies pressure to the push disc and gradually increases under the condition that the normally closed clutch hub and the normally open drum rotate relatively, and then the axial movement and the axial stress change of each element of the normally closed clutch and the normally open clutch are the same as those in step 2, and at the beginning of the clearance elimination of the second friction pair, the pressure applied to the normally closed clutch gradually increases along with F, the pressure N1-F applied to the normally closed clutch gradually decreases until F=N1, so that when N1> F >0, the friction pairs of the normally closed clutch and the normally open clutch are both applied with certain pressure, in order to prevent the two clutches from being combined simultaneously, a short-time locking phenomenon occurs, gear shifting is caused, a certain input torque is required, and meanwhile, in the process, the binding force of the two clutches does not reach the maximum value, in order to prevent a short-time 'galloping' phenomenon, the input torque cannot be too large, and therefore, the process controls the input torque to be in a certain range, so that the two clutches can have a certain simultaneous sliding time, and power is exchanged through half linkage, so as to realize the smoothness of switching from the normally closed clutch combination to the normally closed clutch.

The utility model has the beneficial effects that:

1. normally closed clutch drum and normally open clutch hub integrated into one piece reduces parts, reduces cost, reduces volume

2. The inner and outer nesting of the two clutches reduces the axial size, the space utilization is more reasonable, the arrangement of the pressure plate and the supporting plate can extend from the inside of the normally closed clutch drum to the periphery of the normally closed clutch drum, the number of the elastic bodies can be increased, the length of the elastic bodies is shortened, and the axial size of the double clutch is further reduced.

3. The two clutches can be respectively processed and installed, thereby facilitating quality control and improving manufacturing efficiency

4. One actuator controls two clutches to save cost, save energy, reduce cost and volume

5. The actuator can control two clutches simultaneously by only providing axial acting force of one clutch, thereby further saving cost and energy sources

6. The clutch is easy to control, quick and smooth gear shifting is easy to realize, the gear shifting process is unpowered and interrupted, and the clutch is prevented from being separated simultaneously and is combined with a foolproof effect simultaneously.

Claims (8)

1. The utility model provides a double clutch of inner and outer layer structure which characterized in that: the clutch comprises a normally closed clutch and a normally open clutch, wherein the normally closed clutch is in linkage with the normally open clutch;

the left side of a normally closed clutch drum of the normally closed clutch is provided with at least two axially concave groove parts, the concave groove parts are processed into a step shape, namely stepped groove parts are formed, the stepped groove parts are wide on the left and narrow on the right, the concave groove parts and the stepped groove parts are uniformly distributed in the circumferential direction of the normally closed clutch drum, and a convex part of the normally closed clutch is formed by a non-concave part on the left side of the normally closed clutch drum;

the left side of the normally closed clutch drum is provided with a pressing plate, the left side of the pressing plate is provided with a supporting plate, the pressing plate is provided with a first hole part corresponding to the convex part of the normally closed clutch drum, the pressing plate can be sleeved at the rightmost end of the concave groove part of the normally closed clutch drum through the first hole part to realize the sliding connection of the pressing plate and the normally closed clutch drum, the supporting plate is provided with a second hole part corresponding to the convex part of the normally closed clutch drum, the supporting plate can be sleeved at the stepped groove part of the normally closed clutch drum through the second hole part, the supporting plate is limited by the stepped groove part and can not move right continuously, the left side of the supporting plate on the normally closed clutch drum is provided with a clamping spring to limit the axial relative movement of the supporting plate and the normally closed clutch drum,

first elastic bodies which are uniformly distributed along the circumference are arranged between the pressure plate and the supporting piece, two ends of the first elastic bodies are respectively abutted against the pressure plate and the supporting piece,

the right side of the pressure plate and positioned in the normally closed clutch drum are provided with a first friction pair, the first friction pair comprises a plurality of first outer plates and first inner plates, the plurality of first outer plates and the first inner plates are arranged in a staggered mode, the outer periphery of the first outer plates is in sliding connection with a first spline groove of the normally closed clutch drum through a spline, and the inner periphery of the first inner plates is in sliding connection with the normally closed clutch hub through a spline;

the outer periphery of the normally closed clutch drum and the right side of the pressing disc are provided with normally open clutches, each normally open clutch comprises a normally open clutch drum and a normally open clutch hub, each normally open clutch hub is integrated with the normally closed clutch drum, namely, a second spline groove is formed in the outer periphery of the normally closed clutch drum, a second friction pair is arranged between the normally open clutch drum and the normally open clutch hub, each second friction pair comprises a plurality of second outer sheets and second inner sheets, the plurality of second outer sheets and the second inner sheets are arranged in a staggered mode, the outer periphery of each second outer sheet is in sliding connection with the normally open clutch drum through a spline, and the inner periphery of each second inner sheet is in sliding connection with the second spline groove of the normally open clutch hub through a spline.

2. The dual clutch of inner and outer layer structure as set forth in claim 1 wherein: the clutch device is characterized in that an actuator, a push disc, a friction plate and a baffle are sequentially arranged in the normally open clutch drum from left to right, the baffle is fixedly connected with the normally open clutch drum, the push disc is slidably connected with the baffle through an inner peripheral spline, a return spring is arranged between the baffle and a piston, a normally closed clutch is arranged on the right side of a friction plate in the normally open clutch drum, the friction plate is fixed on the left side surface of a supporting plate, and a dual-plate push disc of the friction plate is slidably connected with the normally open clutch drum through the baffle.

3. Double clutch of inner and outer layer structure according to claim 1 or 2, characterized in that: the support plate is partially arranged in the normally closed clutch drum, and partially arranged on the periphery of the normally closed clutch drum.

4. Double clutch of inner and outer layer structure according to claim 1 or 2, characterized in that: the support plates are all arranged in the normally closed clutch drum, tooth-shaped convex parts are arranged on the periphery of the support plates and are connected with the normally closed clutch drum, and meanwhile, a first elastic body is not arranged on the periphery of the normally closed clutch drum.

5. The dual clutch of inner and outer layer structure as set forth in claim 1 wherein: the first elastic body is one or two of a compression spring, a belleville spring, a diaphragm spring or a wave spring.

6. The dual clutch of inner and outer layer structure as set forth in claim 5 wherein: the first elastic body is arranged between the inner pressure plate and the supporting plate of the normally closed clutch drum, or between the outer pressure plate and the supporting plate of the normally closed clutch drum, or between the inner pressure plate and the supporting plate of the normally closed clutch drum, or between the outer pressure plate and the supporting plate of the normally closed clutch drum.

7. The dual clutch of inner and outer layer structure as set forth in claim 1 wherein: the normally closed clutch hub and the normally open clutch drum are made into an integrated structure, and the normally closed clutch drum and the normally open clutch hub are made into a separated structure.

8. The dual clutch of inner and outer layer structure as set forth in claim 1 wherein: the normally closed clutch and the normally open clutch are one of a multi-plate wet clutch, a dry clutch or a compound clutch.