CN112211936A

CN112211936A - Torsion bar spring and preparation method thereof

Info

Publication number: CN112211936A
Application number: CN202011046864.9A
Authority: CN
Inventors: 柯俊; 赛影辉; 瞿元; 秦玉林; 阴山慧; 李志虎
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-12

Abstract

The disclosure provides a torsion bar spring and a preparation method thereof, and belongs to the technical field of motor vehicles. The torsion bar spring comprises a spring body and two connecting shafts, the two connecting shafts are respectively connected to the end parts of the spring body, the spring body comprises a shell and a filling rod, the shell is a conductive composite material structural part, the two end parts of the shell are respectively provided with a wire connector, the wire connectors are used for being connected with a vehicle-mounted power supply and a vehicle-mounted current control system so as to change the rigidity of the shell by adjusting the current loaded on the shell, the filling rod is inserted into the shell along the length direction of the shell, and the outer wall of the filling rod is connected with the inner wall of the shell; the torsion bar spring also comprises connectors which are in one-to-one correspondence with the connecting shafts, and the connectors are respectively fixedly sleeved on the corresponding connecting shafts. This disclosure can alleviate its whole quality and satisfy the demand that rigidity changes through this torsion bar spring.

Description

Torsion bar spring and preparation method thereof

Technical Field

The disclosure belongs to the technical field of motor vehicles, and particularly relates to a torsion bar spring and a preparation method thereof.

Background

Torsion bar springs are widely used elastic elements in automotive chassis systems. Torsion bar springs have a number of advantages over leaf springs, for example, they have a high energy storage per unit mass, so that the vehicle mass can be reduced and material can be saved. And because the torsion bar spring is fixed on the frame, the unsprung mass is reduced, and the ride comfort of the automobile is improved. When the torsion bar spring is applied to a front suspension of a front drive automobile, the torsion bar spring can be longitudinally arranged to reserve a space for a swing half shaft of a front drive axle.

In the related technology, the torsion bar spring is made of chrome vanadium alloy spring steel and is installed and connected in the chassis.

However, since the torsion bar spring is used as a chassis elastic element of an automobile, the stiffness requirements of the suspension of the torsion bar spring under various working conditions are different, so that the torsion bar spring is required to have a stiffness changing function, but obviously, the above torsion bar spring does not have the stiffness changing function, that is, the actual use requirements of the automobile cannot be met.

Disclosure of Invention

The embodiment of the disclosure provides a torsion bar spring, which can reduce the overall mass and meet the requirement of rigidity change. The technical scheme is as follows:

the embodiment of the disclosure provides a torsion bar spring, which comprises a spring body and two connecting shafts, wherein the two connecting shafts are respectively connected to the end parts of the spring body, the spring body comprises a shell and a filling rod, the shell is a conductive composite material structural part, the two end parts of the shell are respectively provided with a wire connector, the wire connectors are used for being connected with a vehicle-mounted power supply and a vehicle-mounted current control system so as to change the rigidity of the shell by adjusting the current loaded on the shell, the filling rod is inserted into the shell along the length direction of the shell, and the outer wall of the filling rod is connected with the inner wall of the shell;

the torsion bar spring also comprises connectors which are in one-to-one correspondence with the connecting shafts, and the connectors are respectively fixedly sleeved on the corresponding connecting shafts.

In yet another implementation of the present disclosure, the shell includes a layup and an implant layer;

the paving layer is plain woven glass fiber prepreg;

the implanted layer is made of shape memory alloy fibers, and the implanted layer is interwoven in the paving layer at intervals along the latitudinal direction of the paving layer.

In yet another implementation of the present disclosure, the fill direction of the layup is inclined at 45 ° to the axial direction of the filler rod.

In yet another implementation of the present disclosure, the filler rod is a polyurethane structural member.

In another implementation manner of the present disclosure, the connecting shaft is a spline shaft, the connector is a spline connector matched with the connecting shaft, and the inner wall of the connector has a binder.

In another implementation manner of the present disclosure, the connecting shaft and the housing are an integrally formed structural member.

In yet another implementation of the present disclosure, the connector is a metal structural member.

In another implementation manner of the present disclosure, the torsion bar spring further includes a protective layer covering the spring body and the outer wall of the connecting shaft.

In yet another implementation manner of the present disclosure, the protection layer includes an inner epoxy layer, a plain weave glass fiber cloth layer, an outer epoxy layer, and an asphalt layer, the inner epoxy layer is coated on the outer wall of the spring body and the connecting shaft, the plain weave glass fiber cloth layer is coated on the inner epoxy layer, the outer epoxy layer is coated on the plain weave glass fiber cloth layer, and the asphalt layer is coated on the outer epoxy layer.

In yet another implementation manner of the present disclosure, a method for manufacturing a torsion bar spring is provided, the method including:

providing a filler rod;

providing a conductive composite;

coating the conductive composite material on the outer wall of the filling rod to form a preformed body;

curing and molding the pre-molded body to obtain a cured molded body;

providing connectors, and bonding the connectors at two ends of the curing molded body;

and spraying a protective layer on the outer surfaces of the curing molded body and the connector to obtain the torsion bar spring.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

when the torsion bar spring provided by the embodiment of the disclosure is used in an automobile, the torsion bar spring comprises a spring body, a connecting shaft and a connector, the connecting shaft is connected with the spring body, and the connector is fixed on the connecting shaft, so that the torsion bar spring can be directly installed in a chassis of the automobile through the connector.

In addition, the shell and the filling rod of the spring body are both composite material structural parts, and the composite material has higher specific strength, specific modulus and damping ratio compared with a metal material, so that the energy storage capacity and the vibration damping performance of the torsion bar spring can be obviously improved.

In addition, the shell is a conductive composite material structural member, the end part of the shell is provided with a lead connector, and the lead connector is used for being connected with a vehicle-mounted power supply and a vehicle-mounted current control system so as to change the rigidity of the shell.

Drawings

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

FIG. 1 is a schematic structural diagram of a torsion bar spring provided in an embodiment of the present disclosure;

FIG. 2 is a flat layout of a housing in a torsion bar spring provided by an embodiment of the present disclosure;

FIG. 3 is a side view of a connection shaft provided by an embodiment of the present disclosure;

fig. 4 is a side view of a connection head provided in an embodiment of the present disclosure;

FIG. 5 is a flow chart of a method of manufacturing a torsion bar spring according to an embodiment of the present disclosure;

fig. 6 is a flowchart of another method for manufacturing a torsion bar spring according to an embodiment of the present disclosure.

The symbols in the drawings represent the following meanings:

1. a spring body; 11. a housing; 12. a filling rod; 111. a wire connection; 112. layering; 113. an implant layer;

2. a connecting shaft;

3. a connector;

4. and a protective layer.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The disclosed embodiment provides a torsion bar spring, as shown in fig. 1, the torsion bar spring includes a spring body 1 and two connecting shafts 2, and the two connecting shafts 2 are respectively connected to an end portion of the spring body 1.

The spring body 1 comprises a shell 11 and a filling rod 12, wherein the shell 11 is a conductive composite material structural member, two end parts of the shell 11 are respectively provided with a wire connector 111, the wire connectors 111 are used for being connected with a vehicle-mounted power supply and a vehicle-mounted current control system so as to change the rigidity of the shell 11 by adjusting the current loaded on the shell 11, the filling rod 12 is inserted into the shell 11 along the length direction of the shell 11, and the outer wall of the filling rod 12 is connected with the inner wall of the shell 11.

The torsion bar spring also comprises connectors 3 which are in one-to-one correspondence with the connecting shafts 2, and the connectors 3 are respectively fixedly sleeved on the corresponding connecting shafts 2.

When the torsion bar spring provided by the embodiment of the disclosure is used in an automobile, the torsion bar spring comprises a spring body 1, a connecting shaft 2 and a connector 3, the connecting shaft 2 is connected with the spring body 1, and the connector 3 is fixed on the connecting shaft 2, so that the torsion bar spring can be directly installed in a chassis of the automobile through the connector 3.

In addition, the shell 11 and the filler rod 12 of the spring body 1 are both composite material structural members, and the composite material has higher specific strength, specific modulus and damping ratio compared with a metal material, so that the energy storage capacity and the vibration damping performance of the torsion bar spring can be obviously improved.

In addition, because the housing 11 is a conductive composite material structural member, the end portion of the housing 11 is provided with the wire connector 111, and the wire connector 111 is used for being connected with the vehicle-mounted power supply and the vehicle-mounted current control system to change the rigidity of the housing 11, when the torsion bar spring is connected with the vehicle-mounted power supply and the vehicle-mounted current control system, the housing 11 can be powered on through the wire connector 111, so that the housing 11 can have an active rigidity changing function, and further actual requirements of different working conditions of an automobile are met.

From the foregoing, it can be seen that the torsion bar spring becomes stiff and the like due to the housing 11 plays an important role. Therefore, the structure of the housing 11 will be described with reference to fig. 2.

Fig. 2 is a flat layout of a housing in a torsion bar spring provided by an embodiment of the present disclosure, and in conjunction with fig. 2, in the present embodiment, the housing 11 includes a layer 112 and an implant layer 113.

The lay-up 112 is a plain weave glass fibre prepreg.

The implant layers 113 are shape memory alloy fibers, and the implant layers 113 are interwoven within the layup 112 at spaced intervals along the latitudinal direction of the layup 112.

In the above embodiment, the shell 11 is provided as the laminate 112 and the implant layer 113, and the rigidity of the shell 11 can be changed by combining the laminate 112 and the implant layer 113.

That is, the layup 112 is a body portion of the shell 11 for carrying the implant layer 113, the implant layer 113 being for enabling the shell 11 to have variable stiffness properties.

Since Shape Memory Alloy (SMA) fibers are used as the implant layer, and the SMA fibers have the excellent characteristic that the elastic modulus changes with the temperature, when the shell 11 is connected with the vehicle-mounted power supply and the vehicle-mounted current control system through the wire connector 111, the own modulus of the implant layer 113 is significantly changed due to heating after the shell is electrified, so that the rigidity adjustment of the shell 11 is realized.

Meanwhile, because the stiffness of the torsion bar spring is in direct proportion to the shear modulus of the spring body material, when the implanted layer 113 is electrified and heated, the phase change occurs, the elastic modulus of the implanted layer is obviously changed, and the overall modulus of the plain weave glass fiber of the layer 112 is obviously changed. Correspondingly, the shear modulus of the layer 112 changes correspondingly, and finally the overall stiffness of the torsion bar spring changes correspondingly.

The implanted layer 113 is interlaced in the layer 112 at intervals along the latitudinal direction of the layer 112, so that the implanted layer 113 can be uniformly distributed in the layer 112, the shear modulus of the whole area of the layer 112 can be correspondingly changed, and the corresponding change of the overall stiffness of the torsion bar spring is finally realized.

Illustratively, the fill direction of the layup 112 is inclined at 45 to the axial direction of the fill rod 12.

In the above implementation, the layer 112 is arranged as above, because the body 1 of the torsion bar spring mainly bears the torsion load, and the latitudinal direction of the layer 112 is inclined at 45 ° to the axial direction of the filler rod 12, so that the advantages of high strength and high modulus of the layer 112 can be fully exerted, i.e. the body of the torsion bar spring is ensured to have high strength and high modulus.

Alternatively, the filler rod 12 may be a polyurethane structural member.

In the implementation manner, the filling rod 12 is made of a polyurethane material, so that a strong adhesive force can be provided between the filling rod 12 and the shell 11, and the filling rod and the shell 11 can be firmly adhered together.

It will be appreciated that the filler rod 12 may be other structural members of material such as a rubber rod or the like. Since the filler rod 12 is used for preliminary setting of the conductive composite, the present disclosure is not limited thereto as long as the above requirements can be satisfied.

Illustratively, the filler rod 12 may be a cylindrical structural member.

In the above implementation manner, the filler rod 12 is provided as a cylindrical structural member, so that when the torsion bar spring is processed and manufactured, the conductive composite material can be conveniently coiled and coated on the outer wall of the filler rod 12, so as to form a preform of the torsion bar spring.

Of course, the filler rod 12 may also be other types of cylindrical structural members, such as a long bar cylindrical structural member, and the like, as long as the filler rod 12 can meet the actual processing requirements of the torsion bar spring, which is not limited in any way by the embodiments of the present disclosure.

The structure of the connecting shaft 2 and the connecting head 3 will be briefly described with reference to fig. 3.

Fig. 3 is a side view of a connecting shaft according to an embodiment of the present disclosure, and in conjunction with fig. 3, the connecting shaft 2 is a spline shaft structural member.

Fig. 4 is a side view of the connector provided in the embodiment of the present disclosure, and with reference to fig. 4, the connector 3 is a spline connector matched with the connecting shaft 2, and an inner wall of the connector 3 has an adhesive.

In the above implementation mode, the connecting shaft 2 is an external spline, and the spline is provided with the groove and the protrusion, so that the contact area between the connecting shaft and the connector 3 can be increased, the connection between the connecting shaft 2 and the connector 3 is more stable, the centering performance of the connecting shaft 2 and the connector 3 is better when the connecting shaft and the connector are connected and mounted, and the mounting precision is guaranteed.

Correspondingly, the connector 3 is an external spline, and the connecting shaft 2 is in a spline shape, so that the connector 3 is arranged in a shape matched with the connecting shaft 2 for better assembling with the connecting shaft 2, the assembling stability between the connector and the connecting shaft can be obviously improved, and the structural stability of the torsion bar spring is further ensured.

Moreover, as above, the spline has the groove and the protrusion, so the contact area between the connector 3 and the chassis can be increased through the connector 3 of the spline type, and further the connection between the two is ensured to be more stable, and finally the stability of the torsion bar spring during the installation of the automobile chassis is ensured.

In addition, the connector 3 is arranged to be in a spline structure, so that the connector 3 is conveniently connected with the spline structure in the automobile chassis, and further the connection between the connector 3 and the automobile chassis is realized.

Illustratively, the connector 3 may be a metal structural member.

In the above implementation manner, the connector 3 is set as a metal structural member, so that the connector 3 has sufficient strength, and it is ensured that the connector 3 is not damaged in the installation of the automobile chassis and the use of the whole torsion bar spring is not affected.

In this embodiment, in order to improve the manufacturing efficiency of the torsion bar spring, the connecting shaft 2 and the housing 11 may be an integrally formed structural member.

In the above implementation, by integrally molding the connecting shaft 2 and the housing 11, the manufacturing efficiency of the torsion bar spring can be significantly improved.

In the present embodiment, in order to prolong the service life of the torsion bar spring, the protective layer 4 is generally provided on the outer surface of the torsion bar spring, and a specific structure of the protective layer 4 will be described below.

Referring to fig. 1 again, the torsion bar spring further includes a protective layer 4, and the protective layer 4 covers the outer walls of the spring body 1 and the connecting shaft 2.

In the above implementation manner, the protective layer 4 can protect the torsion bar spring, and the torsion bar spring is prevented from being damaged in use to influence the performance of the torsion bar spring.

Optionally, the protective layer 4 includes an inner epoxy resin layer, a plain weave glass fiber cloth layer, an outer epoxy resin layer and an asphalt layer, the inner epoxy resin layer is coated on the outer wall of the spring body 1 and the connecting shaft 2, the plain weave glass fiber cloth layer is coated on the inner epoxy resin layer, the outer epoxy resin layer is coated on the plain weave glass fiber cloth layer, and the asphalt layer is coated on the outer epoxy resin layer.

In above-mentioned implementation, through arranging interior epoxy layer, plain weave glass fiber cloth layer, outer epoxy layer and pitch layer on the spring body surface, can effectually protect this torsion bar spring, prevent to influence its performance because the outward appearance is damaged in the use.

In order to more clearly illustrate the manufacturing process of the torsion bar spring, the manufacturing process of the torsion bar spring is further described with reference to fig. 5.

Fig. 5 is a flowchart of a method for manufacturing a torsion bar spring according to an embodiment of the present disclosure, and with reference to fig. 5, the embodiment of the present disclosure further provides a method for manufacturing a torsion bar spring, where the method for manufacturing a torsion bar spring is based on the above-mentioned torsion bar spring, and the method for manufacturing a torsion bar spring includes:

s501: providing a filler rod;

s502: providing a conductive composite;

s503: coating the conductive composite material on the outer wall of the filling rod to form a preformed body;

s504: curing and molding the preformed body to obtain a cured molded body;

s505: providing connectors, and bonding the connectors at two ends of the solidified body;

s506: and spraying a protective layer on the outer surfaces of the curing molded body and the connector to obtain the torsion bar spring.

When the manufacturing method of the torsion bar spring provided by the embodiment of the disclosure is used for processing and manufacturing the torsion bar spring of the type described above, a filling rod with a proper size is selected at first so as to prepare for forming a pre-forming body for subsequently curling the conductive composite material. The conductive composite is then provided such that the conductive composite is capable of changing its properties during energization of the wire joint to effect a change in the stiffness of the torsion bar spring. And then curling the conductive composite material on the outer wall of the filling rod to form a preformed body, then bonding the conductive composite material and the filling rod together through mould forming to form and solidify the conductive composite material and the filling rod together to obtain a solidified body of the torsion bar spring, then bonding the connectors on two ends of the solidified body to obtain the torsion bar spring, and finally spraying a protective layer on the outer surfaces of the solidified body and the connectors to obtain the torsion bar spring.

The manufacturing method provided by the embodiment of the disclosure has the advantages of clear steps and simple operation, and can enable the specific strength, the specific modulus and the damping ratio of the torsion bar spring to be higher than those of the torsion bar spring made of a metal material by changing the material and the processing steps used by the torsion bar spring, so that the energy storage capacity and the vibration damping performance of the torsion bar spring are obviously improved.

Moreover, when the torsion bar spring is manufactured, the manufacturing material of the housing of the torsion bar spring is changed, and the end portion of the housing 11 is provided with the wire joint 111, so that the rigidity of the housing 11 can be changed by electrically connecting the wire joint 111, and the torsion bar spring has an active rigidity changing function, and further, the damping performance of the suspension can be remarkably improved.

Fig. 6 is a flowchart of another method for manufacturing a torsion bar spring according to an embodiment of the present disclosure, where in combination with fig. 6, the method includes:

s601: a filler rod is provided.

S602: a conductive composite is provided.

Illustratively, step S602 may be implemented by:

firstly, selecting plain glass fiber cloth and shape memory alloy fiber.

In the implementation mode, the plain weave glass fiber cloth has the advantages of light weight, high strength and the like, the prepared torsion bar spring can realize the light weight of an automobile, and the strength requirement in practical use can be met.

And, use plain weave glass fiber cloth can conveniently implant the implantation layer among them, makes both closely cooperate and form an organic whole.

Then, the shape memory alloy fiber is woven in the plain glass fiber cloth at intervals along the weft direction of the plain glass fiber through a three-dimensional orthogonal weaving machine, and a mixed fiber woven body is obtained.

In the implementation mode, the shape memory alloy fiber can memorize the initial shape given by the outside, can be deformed at will after being shaped, and can be fixed for secondary forming at a lower temperature or be fixed for deformation under the forcing of an external force.

When the deformed fiber is heated or washed by water and other external stimulation conditions, the shape memory fiber can restore to the original shape, namely the final product has the function of initial shape memory of the fiber, so that the elastic modulus of the plain weave glass fiber cloth can be changed by heating the plain weave glass fiber cloth by implanting the shape memory alloy into the plain weave glass fiber cloth, the overall modulus of the plain weave glass fiber layer is further driven to be remarkably changed, the shear modulus of the spring body layer is driven to be correspondingly changed, and finally the overall rigidity of the torsion bar spring is driven to be correspondingly changed.

And the memory alloy fiber can be quickly and efficiently implanted into the plain weave glass fiber through the three-dimensional orthogonal weaving machine.

The shape and size of the plain weave glass fiber cloth obtained by weaving need to be adapted to the number of layers of the torsion bar spring layer and the specification.

And then, soaking the mixed fiber woven body into polyurethane resin to obtain the conductive composite material.

In the above implementation manner, the conductive composite material is prepared through the above operations, so that the subsequent step S604 is to perform curing molding on the conductive composite material to obtain a connected integrally cured body of the spring body of the torsion bar spring and the connecting shaft.

S603: and coating the conductive composite material on the outer wall of the filling rod to form a preformed body.

In the implementation mode, the conductive composite material is curled on the outer wall of the filling rod, so that the conductive composite material and the filling rod can be well connected together, and meanwhile, the conductive composite material can be preliminarily shaped to obtain the preformed body.

S604: and carrying out curing molding on the preform to obtain a cured molded body.

Illustratively, step S604 may be implemented by:

firstly, selecting a mould and carrying out pretreatment on the mould.

For example, pre-treatment of the mold generally includes cleaning the mold, applying a release agent within the mold, and heating the mold.

In the above implementation, the mold is heated to a suitable temperature in advance, and if the polyurethane resin is preheated to 70 ℃, so as to ensure the fluidity of the resin.

The die cavity in the die is not only adapted to the cylindrical structure in the middle of the torsion bar spring, but also the die cavities matched with the connecting shaft in forming are respectively arranged at the two ends of the die cavity.

It should be noted that the mold needs to provide space for the wire connections 111 of the SMA fibers.

And then, putting the preformed body into a mold cavity of a mold, closing the mold, injecting resin to enable the conductive composite material to be cured and molded, and obtaining a rough blank for integrally connecting the spring body of the torsion bar spring and the connecting shaft.

After the preformed body is placed in the mold cavity, the mold is closed, resin is injected into the mold cavity according to a certain pressure, the temperature of the mold is increased by 90 ℃, and the composite material spring body is cured and molded.

And then, taking out the rough blank from the die, removing burrs of the rough blank, and performing post-curing treatment to obtain the connection whole body of the spring body of the torsion bar spring and the connecting shaft.

In the implementation mode, the rough blank of the spring body of the composite torsion bar spring is taken out through demoulding, burrs are removed, and the rough blank is placed into a high-low temperature test box and baked for 2 hours at 120 ℃ so as to ensure sufficient post-curing of resin. And after the post-curing process is finished, taking out and naturally cooling.

S605: providing connectors and bonding the connectors at two ends of the solidified body.

Illustratively, step S605 may be implemented by:

first, a connector is provided.

And then, bonding the connecting head on the connecting shaft by using an adhesive.

In the above implementation, the connector is engaged with the connecting shaft at the end of the torsion bar spring made of composite material, and is bonded by using a high-strength adhesive.

It should be noted that the installation and bonding of the connectors cannot affect the leading-out of the SMA fiber wires.

S606: and spraying a protective layer on the outer surfaces of the curing molded body and the connector to obtain the torsion bar spring.

Exemplarily, step S606 may be implemented by:

spraying epoxy resin, coating plain glass fiber cloth, spraying epoxy resin again and spraying asphalt on the surface of the cured body in sequence;

and spraying antirust paint on the surface of the connector.

In the implementation mode, the surface of the cured body is coated with a layer of epoxy resin, wrapped with a layer of plain glass fiber cloth, then coated with a layer of epoxy resin and finally coated with asphalt, so that the torsion bar spring can be effectively protected, and the influence on the performance of the torsion bar spring due to the appearance damage in the use process is prevented.

Through scribble anti-rust paint on the metallic interconnect head surface, can prevent that the connector from rustting to influence the use.

S607: and (4) loading the torsion bar spring for use.

In the implementation mode, the torsion bar spring is connected and installed with the automobile chassis through the connector to finish loading and using.

In the loading process, the wire joint of the SMA fiber in the torsion bar spring is connected with a vehicle-mounted power supply and a vehicle-mounted current control system to form a conductive loop, so that the rigidity of the torsion bar spring is changed through the wire joint, and the actual use requirement is further met.

And finishing the preparation of the variable stiffness composite torsion bar spring.

The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims

1. A torsion bar spring comprises a spring body (1) and two connecting shafts (2), wherein the two connecting shafts (2) are respectively connected to the end part of the spring body (1), and the torsion bar spring is characterized in that;

the spring body (1) comprises a shell (11) and a filling rod (12), wherein the shell (11) is a conductive composite material structural part, two end parts of the shell (11) are respectively provided with a wire connector (111), the wire connectors (111) are used for being connected with a vehicle-mounted power supply and a vehicle-mounted current control system so as to change the rigidity of the shell (11) by adjusting the current loaded on the shell (11), the filling rod (12) is inserted into the shell (11) along the length direction of the shell (11), and the outer wall of the filling rod (12) is connected with the inner wall of the shell (11);

the torsion bar spring further comprises connectors (3) which are in one-to-one correspondence with the connecting shafts (2), and the connectors (3) are fixedly sleeved on the corresponding connecting shafts (2) respectively.

2. The torsion bar spring according to claim 1, wherein the housing (11) comprises a laminate layer (112) and an implant layer (113);

the paving layer (112) is plain woven glass fiber prepreg;

the implant layer (113) is made of shape memory alloy fibers, and the implant layer (113) is interwoven in the layer (112) at intervals along the latitudinal direction of the layer (112).

3. A torsion bar spring according to claim 2, wherein the weft direction of the lay-up (112) is inclined at 45 ° to the axial direction of the filler rod (12).

4. A torsion bar spring according to any of claims 1-3, wherein said filler rod (12) is a polyurethane structure.

5. A torsion bar spring according to any of claims 1-3, wherein the connection shaft (2) is a splined shaft, the connection head (3) is a splined connection matching the connection shaft (2), and the inner wall of the connection head (3) is provided with an adhesive.

6. A torsion bar spring according to any of claims 1-3, wherein said connection shaft (2) and said housing (11) are an integral structural part.

7. A torsion bar spring according to any of claims 1-3, wherein said connection head (3) is a metallic structure.

8. A torsion bar spring according to any one of claims 1 to 3, further comprising a protective layer (4), wherein said protective layer (4) covers the outer walls of said spring body (1) and said connecting shaft (2).

9. The torsion bar spring according to claim 8, wherein the protective layer (4) includes an inner epoxy resin layer coated on the outer wall of the spring body (1) and the connecting shaft (2), a plain weave glass cloth layer coated on the inner epoxy resin layer, an outer epoxy resin layer coated on the plain weave glass cloth layer, and an asphalt layer coated on the outer epoxy resin layer.

10. A production method of a torsion bar spring, which is applied to the torsion bar spring according to any one of claims 1 to 9, characterized by comprising:

providing a filler rod;

providing a conductive composite;

curing and molding the pre-molded body to obtain a cured molded body;