KR101837345B1 - Manufacturing method for drive shaft for vehicle - Google Patents

Abstract

The present invention relates to a method for producing an automotive drive shaft. More specifically, the present invention relates to a method for producing a drive shaft which is connected by flexible joint respectively on a rear axle and a transmission in order to transmit power generated from an engine to wheels. According to the present invention, it is possible to reduce the injury on a driver due to the shock absorption by the automotive drive shaft of the vehicle in the event of an accident.

Description

TECHNICAL FIELD [0001] The present invention relates to a drive shaft for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a drive shaft for a vehicle, and more particularly, to a drive shaft having a hollow steel pipe, The present invention provides a vehicle drive shaft for reducing a driver's injury due to shock absorption by a drive shaft of a vehicle in the event of a vehicle collision centered on the front and rear sides as well as enhancing the reinforcement performance for ensuring durability and weatherability, And a manufacturing method thereof.

The power generated by the engine of the vehicle is transmitted to the wheels by the drive shaft via the transmission.

The conventional power transmission apparatus for transmitting the driving force of the engine to the tire mounted on the rear axle is composed of a transmission and a drive shaft connected to the rear axle for rotating the wheel and the flexible joint respectively.

Accordingly, the power generated in accordance with the rotation of the engine is transmitted to the rear axle through the drive shaft connected to the transmission through shunting, thereby driving the wheels.

However, since the conventional drive shaft rotates at a high speed while being subjected to strong torsion from the engine, it is made of a hollow steel tube which can withstand this, and is formed into a single pipe from the transmission to the rear axle. Therefore, durability and weatherability are required have.

Korean Patent Application Publication No. 10-2002-0044466 "A CONNECTION STRUCTURE OF DRIVE SHAFT IN AN AUTOMOBILE" Korean Patent Registration No. 10-1428248 entitled " MOUNTING STRUCTURE FOR DRIVE SHAFT "

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a drive shaft which is a hollow steel pipe and integrally formed from a transmission to a rear axle, And to provide a reinforcing structure for ensuring weather resistance.

It is another object of the present invention to provide a method of manufacturing a drive shaft for a vehicle, which can serve as an auxiliary bumper for relieving a driver's injury due to impact absorption by a drive shaft for a vehicle in the event of a vehicle collision centering forward and rearward.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, a manufacturing method of a drive shaft for a vehicle according to an embodiment of the present invention is a manufacturing method for a drive shaft connected to a transmission and a rear axle by a flexible joint to transmit power generated from an engine to a wheel, A first shaft portion 110, a second shaft portion 120, and a center portion 130 are formed in the longitudinal direction, and a shaft body (not shown) 110). In order to perform automation, the main controller of the working means transfers the lower mold plate extracted from the mold molding machine to the mold mold package, applies the mold molding to the inner mold, and then transfers the lower mold plate to the mold After placing the upper template on the lower template that is inverted by the reversing device, the upper template and the lower template are simultaneously transferred to the assembler A first step of continuously controlling a work process of extracting a molded mold from the molding machine; The main controller forms a stiffener 140 in each of the two divided shaft bodies 110 extracted from the stiffener, and the stiffener 140 is formed inside the stiffener 140 in contact with the inner peripheral surface of the shaft body 100 And a fiber material formed on the outer surface of the molded body. The formed body is formed of a non-metallic material such as a thermosetting plastic material or a molten material of aluminum or stainless steel metal, The main controller controls the carbon fiber, the connecting fiber, and the reinforcing fiber to be formed in the order of the fiber material on the upper side of the molded body after the forming thereof. The main shock absorber 150 may be attached to the inside of the reinforcing member 140. The main controller may cast the uniform polymer composition into a predetermined mold at a high temperature of 210 to 300 DEG C by casting mold, A third step of injecting molten metal into the reinforcing member 140 in the form of a pad after cooling it after the injection molding; When the main body controller 100 completes the formation of the stiffener 140 and the shock absorber 150 inside the shaft body 100 divided into two parts, the two divided shaft bodies 100 A fourth step of bonding the hollow drive shaft to the hollow drive shaft through frictional welding using frictional heat; And a control unit.

Further, in the method of manufacturing a drive shaft for a vehicle according to another embodiment of the present invention, in the second step, the fibrous material may be formed by laminating carbon fibers and reinforcing fibers forming one layer as main materials of the stiffener, 30 to 40 parts by weight of a plastic composite material having a high melting point of 15 to 30 denier in length and a length of 30 to 40 parts by weight of a plastic composite material are mixed and processed, It is preferable that they are stacked in this order.

According to the method for manufacturing a drive shaft for a vehicle according to an embodiment of the present invention, the shape of a conventional drive shaft is maintained with respect to a drive shaft, which is a hollow steel pipe and integrally formed from a transmission to a rear axle, It is possible to provide reinforcing performance for ensuring durability and weather resistance.

In addition, according to the method for manufacturing a drive shaft for a vehicle according to another embodiment of the present invention, it is possible to reduce an injury of a driver by shock absorption by a drive shaft for a vehicle in the event of a vehicle collision centering around the front and rear.

1 is a view showing a shaft body 100 used in a drive shaft 1 and 1a for a vehicle according to an embodiment of the present invention.
2 is a view showing a drive shaft 1 for a vehicle according to an embodiment of the present invention.
3 is a view showing a drive shaft 1a for a vehicle according to another embodiment of the present invention.
4 is a view showing a method of manufacturing a drive shaft for a vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing a shaft body 100 used in a drive shaft 1 and 1a for a vehicle according to an embodiment of the present invention. Referring to FIG. 1, the shaft body 100 may be divided into a first shaft portion 110, a second shaft portion 120, and a middle portion 130.

Here, the first shaft portion 110 may be connected to the transmission through a flexible joint to transmit the power generated from the engine to the second shaft portion 120 through the center portion 130.

The second shaft portion 120 may be connected to the rear axle and the flexible joint so as to transmit the power transmitted through the first shaft portion 110 and the center portion 130 to the wheels.

The diameter of the central portion 130 is larger than that of the first shaft portion 110 and the second shaft portion 120 and the diameters of the first shaft portion 110 and the second shaft portion 120 are gradually increased, As shown in FIG.

When the shaft body 100 is divided into two, and the stiffener 140 and the shock absorber 150, which will be described later, are formed in the two divided shaft bodies 100, By joining the two divided shaft bodies 100 by frictional welding using frictional heat.

2 is a view showing a drive shaft 1 for a vehicle according to an embodiment of the present invention. Referring to FIG. 2, the vehicle drive shaft 1 may include a stiffener 140 formed on the shaft body 100 of FIG.

The stiffener 140 is formed inside the shaft body 100 in which the first shaft portion 110, the center portion 130, and the second shaft portion 120 are formed in order.

A molded body abutting the inner circumferential surface of the shaft body 100 and a fibrous material formed on the outer surface of the molded body. The molded body may be formed of a non-metallic material such as plastics or aluminum or stainless steel metal, Type.

Here, the fibrous material is a main material of the reinforcing material, and the carbon fibers and the reinforcing fibers forming one layer are connected to each other through the connecting fibers. The reinforcing fiber is prepared by mixing and processing 30 to 40 parts by weight of a plastic composite material using long fibers having a high melting point of 15 to 30 denier and having a melting point higher than that of the thermoplastic synthetic fiber and then punching the processed sheet with needles. A connecting fiber formed of a thermosetting synthetic fiber is connected between the carbon fiber and the reinforcing fiber.

More specifically, the fibrous material can produce a honeycomb lattice structure according to a mesh process by a needle split method, and the upward direction of the needle split roller formed along the outer circumferential surface of the lattice type needle constitutes a fiber material It is preferable to form by drag-type punching of the grid-like needle by rotation of the needle split roller in a state in which the carbon fibers, the connecting fibers and the reinforcing fibers pass each other.

On the other hand, it is preferable that the stretching is performed after the needle puncture, in which the stabilization by heating is performed by setting the stretching temperature for the honeycomb lattice structure to 2.2 to 2.4 times according to the mesh process by the needle split method .

That is, the area ratio of the carbon fiber, the connecting fiber, and the reinforcing fiber sheet subjected to the heating method stretching is increased to 3 to 4.2 times before and after stretching, but the shrinkage ratio due to the heat deformation can be lowered to 1% or less.

Here, the carbon fiber is required to be provided with high strength and high degree of sophistication by firing acrylic nitrile-based synthetic fiber, and it can be said that the fiber is made only of carbon. This is because the pitch which can be taken from acrylic resin, , And then a special heat treatment process is performed to form a fibrous carbon material having a fine graphite crystal structure.

That is, the acrylic-based nitrile-based synthetic fibers are subjected to a multi-step stretching treatment in an oxidizing gas atmosphere at 300 to 350 占 폚 in a range of 100 to 150% so as to obtain a fiber density of 1.56 to 1.65 g / cm3.

Thereafter, carbon fibers having a strength of 350 kg / mm 2 or more, a modulus of elasticity of 25 to 27 ton / mm 2 and an elongation of 1.57% or more can be stably supplied at a high efficiency and at a high efficiency by treating the chlorinated yarn at a temperature of 300 to 1,000 ° C. in an inert gas atmosphere at a temperature of 100 to 120% shall.

On the other hand, as for the reinforcing fibers, it is preferable that the reinforcing fibers in the form of sheets processed with 60 to 70 parts by weight of the thermoplastic synthetic fibers having a denier of 35 to 56 denier are placed, and the thermoplastic synthetic fibers constituting the reinforced fibers, So that the carbon fibers, the connecting fibers, and the reinforcing fibers are integrally adhered to each other.

The thermoplastic synthetic fiber is a nonwoven fabric having excellent properties such as stability and thermal stability. To this end, 5 to 10 parts by weight of a thermoplastic multifilament corresponding to one of polypropylene, polyester and polyamide, 70 to 75 parts by weight of polyethylene terephthalate (PET) and 20 to 25 parts by weight of polyethylene naphthalate (PEN) A thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance is used by using multifilaments produced by melt spinning a copolymer.

That is, the fibers constituting the nonwoven fabric are multifilaments or staple fibers made of a copolymer or blend of polyethylene terephthalate and polyethylene naphthalate, and the weather resistance (tensile strength retention) is 80% Or more.

3 is a view showing a drive shaft 1a for a vehicle according to another embodiment of the present invention. Referring to FIG. 3, the vehicle drive shaft 1a may include a stiffener 140 formed on the shaft body 100 of FIG. 1, and a shock absorber 150.

Here, the shock absorber 150, which is a difference from FIG. 2, will be mainly described.

The shock absorber 150 may provide a collision absorbing structure for alleviating the injury of the driver by shock absorption by the drive shaft 1a of the vehicle in the event of a vehicle collision.

To this end, the shock absorber 150 should act so as to absorb external shocks due to the reaction of the stiffener 140 with the increase of the torsional and tensile strength.

The monopolymer composition may be molded into a certain mold at a high temperature of 210 to 300 DEG C by casting molding or injection molding after cooling the mold and then cooling the reinforcing material 140 in a pad form, It can be attached to the inside.

Wherein the shock absorber composition comprises 70 to 80% by weight of paraffin oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin, 5 to 10% by weight of a hydrogenated resin and 1 to 2% .

That is, the materials constituting the shock absorber composition were mixed in a kneading and stirring apparatus, the temperature of the kneading and stirring apparatus was gradually raised to 300 ° C., and the mixture was slowly stirred for 5 to 7 hours to thoroughly mix the entire composition in a stirrer. Of the viscoelastic resin.

The thus prepared shock absorber composition has a high elongation and strength, and is soft and flexible and has an elastic restoring force against externally applied force.

On the other hand, in order to increase the strength of the shock absorber, it is possible to prepare the aluminum alloy by dissolving the aluminum material and then transferring the molten aluminum to the stirring rod for stirring with the shock absorber composition and adding TiH2 as the foaming agent.

Here, the aluminum foamed by the foaming agent adheres to the reinforcing fibers of the reinforcing material 140, thereby reinforcing the innermost tensile strength.

4 is a view showing a method of manufacturing a drive shaft for a vehicle according to an embodiment of the present invention.

Referring to FIG. 4, the shaft body 110 is divided into two parts (S110).

More specifically, the first shaft portion 110, the second shaft portion 120, and the center portion 130 are formed in the longitudinal direction, and the mold of the shaft body 110 divided into two in the longitudinal direction is used. In order to automate this, the main controller of the working means transfers the lower mold plate extracted from the mold molding machine to the mold mold package, applies the mold mold to the inner mold, seats the lower mold plate on the model jig on which the coolant and the filter are disposed, The upper mold plate and the lower mold plate are simultaneously transferred to the sifter, and the work process of extracting the sifted mold from the sifter is continuously controlled.

On the other hand, the shaft body 110 divided into two parts may be manufactured by injection molding as well as cast molding.

After step S110, a stiffener 140 is formed inside (S120). More specifically, the main controller has a stiffener 140 formed inside each of the two divided shaft bodies 110 extracted from the stiffener, and the stiffener 140 is disposed inside the stiffener 140. The stiffener 140 includes a molded body abutting the inner circumferential surface of the shaft body 100, And a fiber material formed on the surface of the substrate.

Here, the formed body is formed of a nonmetal such as a thermosetting plastic, or a molten body of aluminum or stainless steel, so that the fiber material can be connected to the shaft body 110.

On the other hand, the main controller can be controlled to form the carbon fiber, the connecting fiber and the reinforcing fiber in this order as the fiber material on the upper side after forming the molded body.

Here, the fibrous material is a plastic composite material in which a carbon fiber forming one layer as a main material of the reinforcing material, and a reinforcing fiber having a thickness of 15 to 30 denier, which has a higher melting point than the lattice thermoplastic synthetic fiber vertically through the connecting fiber, And 40 parts by weight of carbon fibers are mixed and processed. Then, the processed sheet is punctured with needles, and the carbon fibers, the connecting fibers, and the reinforcing fibers may be laminated in this order.

Here, the carbon fiber is to be provided with high strength and high strength by firing acrylic nitrile-based synthetic fiber. That is, the acrylic-based nitrile-based synthetic fibers are subjected to a multi-step stretching treatment in an oxidizing gas atmosphere at 300 to 350 占 폚 in a range of 100 to 150% so as to obtain a fiber density of 1.56 to 1.65 g / cm3.

Thereafter, carbon fibers having a strength of 350 kg / mm 2 or more, an elastic modulus of 25 to 27 ton / mm 2 and an elongation of 1.57% or more are utilized by subjecting the chlorinated yarn to a stretching treatment at a temperature of 300 to 1,000 ° C in an inert gas atmosphere at 100 to 120%.

On the other hand, as for reinforcing fibers, 60 to 70 parts by weight of thermoplastic synthetic fibers having a denier of 35 to 56 denier and thermoplastic synthetic fibers constituting the fabricated reinforcing fibers are placed as connecting fibers The carbon fibers, the connecting fibers, and the reinforcing fibers can be integrally adhered by partial melting.

The thermoplastic synthetic fiber is a nonwoven fabric having excellent properties such as stability and thermal stability. To this end, 5 to 10 parts by weight of a thermoplastic multifilament corresponding to one of polypropylene, polyester and polyamide, 70 to 75 parts by weight of polyethylene terephthalate (PET) and 20 to 25 parts by weight of polyethylene naphthalate (PEN) A thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance is used by using multifilaments produced by melt spinning a copolymer.

That is, the fibers constituting the nonwoven fabric are multifilaments or staple fibers made of a copolymer or blend of polyethylene terephthalate and polyethylene naphthalate, and the weather resistance (tensile strength retention) is 80% Or more.

After step S120, the shock absorber 150 is attached (S130).

More specifically, the main controller is formed by casting a uniform polymer composition with a shock absorber composition at a high temperature of 210 to 300 DEG C in a certain mold, casting the mold, injection molding, To the inside of the stiffener (140).

Here, the shock absorber composition may contain a small amount of an antioxidant (a total amount of the shock absorber (s) is / are added) to 70 to 80 wt.% Of paraffin oil, 15 to 20 wt.% Of a tri-hydrocopolymer resin of styrene- 1 to 2% of the weight of the composition).

After step S130, the two divided shaft bodies are joined (S140).

More specifically, when the main controller has completed the formation of the stiffener 140 and the shock absorber 150 in the two divided shaft bodies 100, the main controller uses frictional heat for the two divided shaft bodies 100 So that the hollow drive shaft can be manufactured.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

1, 1a: drive shaft for vehicles
100: shaft body
110: first shaft portion
120: second shaft portion
130:
140: Stiffener

Claims (2)

delete In a manufacturing method for a drive shaft connected to a transmission and a rear axle by a flexible joint so as to transmit power generated from the engine to a wheel,
The shaft body 110 is divided into two in the longitudinal direction. The shaft body 110 has a first shaft portion 110, a second shaft portion 120, and a central portion 130 formed in a longitudinal direction. ), And the main controller of the working means for carrying out the automation is such that the lower mold plate extracted from the mold molding machine is transferred to the mold applicator, and the mold mold is applied to the inner mold, and then the lower mold plate is cooled The upper mold plate and the lower mold plate are simultaneously transferred to a saddle stitcher, and a work process for continuously extracting the molded molds from the saddle stitcher is carried out. Stage 1;
The main controller forms a stiffener 140 in each of the two divided shaft bodies 110 extracted from the stiffener, and the stiffener 140 is formed inside the stiffener 140 in contact with the inner peripheral surface of the shaft body 100 And a fiber material formed on the outer surface of the molded body. The formed body is formed of a non-metal material such as a thermosetting plastic material or a molten material of aluminum or stainless steel metal. The fiber material is connected to the shaft body 110 The main controller controls the carbon fiber, the connecting fiber, and the reinforcing fiber to be formed in the order of the fiber material on the upper side of the molded body after the forming thereof.
The main shock absorber 150 may be attached to the inside of the reinforcing member 140. The main controller may cast the uniform polymer composition into a predetermined mold at a high temperature of 210 to 300 DEG C by casting mold, A third step of injecting molten metal into the reinforcing member 140 in the form of a pad after cooling it after the injection molding; And
When the stiffener 140 and the shock absorber 150 are formed in the shaft body 100 divided into two by the main controller, the two divided shaft bodies 100 are joined together. A fourth step of joining the hollow drive shaft to the hollow drive shaft by frictional welding using frictional heat; / RTI >
In the second step, the fibrous material is connected to the reinforcing fibers through the connecting fibers, wherein the carbon fibers and the reinforcing fibers forming one layer as the main material of the reinforcing material are connected to each other through the connecting fibers. , And the fiber is dipped in the range of 100 to 150% so as to have a fiber density of 1.56 to 1.65 g / cm 3 under the condition that the reinforcing fiber has a thickness of 15 to 30 denier which is higher than that of the thermoplastic synthetic fiber And 30 to 40 parts by weight of a plastic composite material are mixed and processed to form a processed sheet in the form of needles. The connecting fibers formed of the thermosetting synthetic fibers are formed between the carbon fibers and the reinforcing fibers Wherein the drive shafts are mounted on the drive shafts.

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