KR20200022625A - Manufacturing method of carbon fiber reinforced plastic drive shaft for vehicle - Google Patents

Manufacturing method of carbon fiber reinforced plastic drive shaft for vehicle Download PDF

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KR20200022625A
KR20200022625A KR1020180098446A KR20180098446A KR20200022625A KR 20200022625 A KR20200022625 A KR 20200022625A KR 1020180098446 A KR1020180098446 A KR 1020180098446A KR 20180098446 A KR20180098446 A KR 20180098446A KR 20200022625 A KR20200022625 A KR 20200022625A
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South Korea
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tube
shaft
joint
drive shaft
forming
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KR1020180098446A
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Korean (ko)
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KR102208388B1 (en
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한무경
김춘엽
정건영
최용훈
이동훈
이동엽
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효림산업 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/22—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars

Abstract

The present invention relates to a CFRP drive shaft manufacturing method for a vehicle. The present invention comprises: a joint part molding process (S10) of forming a stub shaft (110) by integrally molding a joint part (113) formed of a polygonal inner shape on the inner circumferential surface of an insertion part (112) while casting-molding the stub shaft (110); a tube sheet forming process (S20) of forming a tube sheet by stacking prepreg formed by impregnating carbon fibers in resin to a predetermined thickness; a tube body forming process (S30) of winding the tube sheet into a cylindrical shape to seal an edge part and form a tube body; a preliminary tube forming process (S40) of cutting the tube body to correspond to the length of the shaft tube to form a preliminary tube; a joint tube forming process (S50) of forming a shaft tube (120) by putting both ends of the preliminary tube into a hot press and integrally molding a joint tube (121), which is formed with the appearance and interior of a polygonal shape corresponding to the joint unit (113), at the both ends of the preliminary tube; and a bonding step (S60) of applying an adhesive means to the outer circumferential surface of the joint tube (121) of the shaft tube (120), and inserting and fixating the same into the joint part (113) of the stub shaft (110) to fix. The present invention is able to conveniently manufacture a drive shaft which has a solid coupling structure between a stub shaft and a shaft tube made of different materials.

Description

자동차용 CFRP 드라이브샤프트 제조방법{MANUFACTURING METHOD OF CARBON FIBER REINFORCED PLASTIC DRIVE SHAFT FOR VEHICLE}MANUFACTURING METHOD OF CARBON FIBER REINFORCED PLASTIC DRIVE SHAFT FOR VEHICLE}

본 발명은 자동차용 CFRP 드라이브샤프트 제조방법에 관한 발명으로, 더욱 상세하게는 엔진의 구동력을 바퀴에 전달해 주는 역할을 하는 드라이브샤프트를 제조함에 있어 CFRP 재질의 샤프트튜브와 금속 재질로 이루어진 스텁샤프트를 간편하게 성형 및 결합하여 견고한 결합구조를 형성하면서 경량화 등의 이점을 가지는 드라이브샤프트를 제조하는 기술에 관한 것이다.The present invention relates to a CFRP drive shaft manufacturing method for automobiles, and more particularly in the manufacture of a drive shaft that serves to transfer the driving force of the engine to the wheel, the shaft stub shaft made of CFRP material and metal easily The present invention relates to a technology for manufacturing a drive shaft having advantages such as weight reduction while forming and joining to form a rigid coupling structure.

일반적으로, 드라이브샤프트는 엔진의 구동력을 바퀴에 전달해 주는 역할을 하는 부품이다. 독립 서스펜션 시스템의 경우 변속기에 연결된 파이널 드라이브는 차체에 고정되나 양쪽 바퀴는 독립하여 구동한다. 따라서 차량의 주행 시 상, 하 운동이 자유롭게 이루어지도록 하기 위해서 드라이브샤프트가 파이널 드라이브와 바퀴 사이를 연결하도록 탑재된다. 전륜구동 차량에는 앞쪽에 2개, 후륜구동 차량에는 뒤쪽에 2개의 드라이브샤프트가 탑재되며 대부분의 4륜구동 차량에는 앞뒤 합하여 모두 4개의 드라이브샤프트가 탑재된다.In general, the drive shaft is a part that transmits the driving force of the engine to the wheel. In the case of an independent suspension system, the final drive connected to the transmission is fixed to the body, but both wheels are driven independently. Therefore, the drive shaft is mounted to connect between the final drive and the wheel so that the up and down movement can be freely performed while the vehicle is running. The front wheel drive car has two drive shafts at the front and the rear wheel drive car has two drive shafts at the rear, and most four wheel drive cars have four drive shafts.

통상적인 드라이브샤프트는 구동력을 전달하는 주축이 되는 샤프트튜브와, 샤프트뷰브의 양단에서 파이널 드라이브 및 바퀴에 연결부를 형성하는 스텁샤프트가 결합된 형태로 이루어진다. 스텁샤프트의 외측에는 그리스가 채워지도록 고무 부츠가 감싸도록 구비되며 단부에는 스플라인이 절삭 가공된다.Conventional drive shaft is composed of a shaft tube which is a main shaft for transmitting a driving force and a stub shaft that forms a connection to the final drive and the wheel at both ends of the shaft hub. The outside of the stub shaft is provided to surround the rubber boots so that grease is filled, and the end is splined.

드라이브샤프트의 재료는 고속 회전력 및 강력한 비틀림 토크를 견딜 수 있도록 강재를 사용하는 것이 일반적이나, 연비나 동력전달 성능의 향상 및 경량화를 위해 최근에는 합금, 탄소섬유 등의 복합소재를 사용하여, 예컨대 샤프트튜브는 탄소섬유로, 스텁샤프트는 금속재로 구성하는 형태로 제조되고 있다.The material of the drive shaft is generally made of steel to withstand high torque and strong torsional torque.However, in order to improve fuel efficiency, power transmission performance and light weight, composite materials such as alloys and carbon fibers have recently been used, for example, shafts. The tube is made of carbon fiber and the stub shaft is made of metal.

일례로서, 한국등록특허 제 10 - 0179478 호에는 탄소섬유, 유리섬유등과 수지의 복합재료를 설치하여 마주하는 내부에 공간을 형성하는 튜브와, 튜브의 내공간보다 큰 직경으로 접합부를 갖고 이들을 이음재로 연결하는 요크로 형성하여 요크의 접합부의 끝부분이 튜브에 억지삽입되는 구성으로 이루어진 복합재료제 구동축을 구성한다.As an example, Korean Patent No. 10-0179478 has a tube which forms a space in the interior facing each other by installing a composite material of carbon fiber, glass fiber, etc., and a joint having a joint having a diameter larger than the inner space of the tube. A drive shaft made of a composite material is formed by forming a yoke connected to the ends of the yoke and forcing the end of the yoke joint into the tube.

다른 예로서, 한국공개특허 제 10 - 2012 - 0040715 호에는 FRP 원통의 양단부에 금속제의 단부 조인트를 결합하여 구성되는 FRP제 구동 샤프트에 있어서, 단부 조인트를 FRP 원통 내에 압입되는 세레이션부를 갖는 압입 조인트와, FRP 원통 바깥둘레에 고정되는 원통형 아우터 칼라로 구성하고, 압입 조인트와 원통형 아우터 칼라로 서로 계합하여 회전을 전달하는 비원형 계합부를 각각 형성한 FRP제 구동 샤프트를 구성한다.As another example, Korean Patent Laid-Open Publication No. 100402012 discloses a press-fit joint having a serration portion press-fitting an end joint into an FRP cylinder in a drive shaft made of FRP configured by coupling end joints made of metal to both ends of the FRP cylinder. And a drive shaft made of FRP formed of a cylindrical outer collar fixed to an outer periphery of the FRP cylinder, and each of which has a non-circular engagement portion engaged with each other by a press-fit joint and a cylindrical outer collar to transmit rotation.

한편, 통상적인 복합소재 드라이브샤프트는 특히 비틀림 토크 및 주행 시 충격을 견디기 위해 코어에 탄소섬유를 와인딩하는 와인딩 장치와, 와인딩된 탄소섬유 위에 탄소섬유를 브레이딩하는 브레이딩 장치를 이용해 중공관체 형상으로 재직하여 형성하도록 이루어진다.Meanwhile, the conventional composite drive shaft has a hollow tube shape using a winding device for winding carbon fibers in the core and a braiding device for braiding carbon fibers on the wound carbon fiber to withstand torsional torque and impact during driving. To serve in office.

예컨대, 한국등록특허 제 10 - 1772510 호에는 상기와 같은 복합소재 드라이프샤프트에서 탄소섬유를 이용해 샤프트튜브를 제조하는 방법에 관해 공지하고 있는바, 그 개략적인 구성을 살펴보면 하기와 같다.For example, Korean Patent No. 10-1772510 discloses a method of manufacturing a shaft tube using carbon fiber in the composite dry shaft as described above, and a schematic configuration thereof is as follows.

드라이브 샤프트를 제조하는 장치에 있어서, 드라이브 샤프트를 구성하는 코어 샤프트가 삽입되는 축공이 중심부에 구비된 프레임과, 축공에 삽입된 코어 샤프트의 주위를 회전하면서 코어 샤프트에 제1탄소섬유를 와인딩하는 와인딩부와, 와인딩된 제1탄소섬유 위에 제2탄소섬유를 브레이딩하는 브레이딩부와, 코어 샤프트를 잡아당겨 축공으로부터 코어 샤프트를 빼내는 로봇부를 포함하고, 와인딩부는 몸체, 몸체에 회전가능하게 설치된 보빈, 상기 축공의 주위를 360°로 둘러가며 원형으로 설치되며 몸체가 이동가능하게 결합된 레일, 레일을 따라 몸체를 이동시키는 구동부로 구성되며, 브레이딩부는 상기 축공의 주위를 360°로 둘러가며 위치된 보빈들과, 보빈들을 구동시키는 구동부로 구성되며, 상기 보빈들은 상기 레일의 바깥쪽에 위치되어 와인딩과 브레이딩이 연속적으로 진행되도록 구성한다.A device for manufacturing a drive shaft, comprising: a frame having a shaft hole into which a core shaft constituting a drive shaft is inserted, and a winding for winding the first carbon fiber to the core shaft while rotating around a core shaft inserted into the shaft hole And a braiding unit for braiding the second carbon fiber on the wound first carbon fiber, and a robot unit for pulling the core shaft out of the shaft hole to pull the core shaft out, and the winding unit body, a bobbin rotatably installed on the body, The circular circumference of the shaft hole is installed around 360 °, and the rail is movably coupled to the body, and includes a driving unit for moving the body along the rail, and the braiding part is located around 360 ° around the shaft hole. Bobbins and a drive unit for driving the bobbins, the bobbins being located outside of the rail and Configure the leading and braiding to proceed continuously.

한국등록특허 제 10 - 0179478 호 (1998.11.27)Korea Patent Registration No. 10-0179478 (1998.11.27) 한국공개특허 제 10 - 2012 - 0040715 호 (2012.04.27)Korean Patent Publication No. 10-2012-0040715 (2012.04.27) 한국등록특허 제 10 - 0131044 호 (1997.11.26)Korea Patent Registration No. 10-0131044 (1997.11.26) 한국등록특허 제 10 - 1772510 호 (2017.08.23)Korea Patent Registration No. 10-1772510 (2017.08.23)

종래 기술에서는 복합소재를 사용하는 드라이브샤프트를 제조하기 위해 코어에 탄소섬유를 와인딩하는 와인딩 장치와, 와인딩된 탄소섬유 위에 탄소섬유를 브레이딩하는 브레이딩 장치를 이용해 탄소섬유를 길이 방향 관체 형상으로 재직하여 형성한 후 코어를 제거하는 방식으로 제조하였으며, 상기 예시한 종래 기술에서는 와인딩 장치와 브레이딩 장치를 결합한 형태의 드라이브샤프트 제조장치를 공지하고 있다.In the prior art, a carbon fiber is wound into a longitudinal tubular shape using a winding device for winding carbon fibers in the core and a braiding device for braiding carbon fibers on the wound carbon fiber to manufacture a drive shaft using a composite material. After forming to form a core to remove the core, the prior art exemplified above is known a drive shaft manufacturing apparatus of the type combined with a winding device and a braiding device.

그러나, 상기와 같은 종래 기술이 적용되는 복합소재를 사용하는 드라이브샤프트 제조방식은 우선, 와인딩부 및 브레이딩부와, 최종 코어를 제거하는 로봇부 등 제조장치의 구성 및 제조공정이 매우 복잡하여 시스템 구축에 경제적인 부담이 있는 단점이 있다.However, in the drive shaft manufacturing method using the composite material to which the prior art is applied, the construction and manufacturing process of the manufacturing apparatus such as the winding part and the braiding part, and the robot part removing the final core are very complicated. There is an economic burden.

특히, 탄소섬유를 관체 형상으로 와인딩 및 브레이딩하는 방식의 재직작업은 공정시간이 장시간 소요될 뿐만 아니라, 관경 등의 정밀한 규격 도출에 어려움이 있는 등 생산성 및 효율성이 낮은 단점이 있다. In particular, the work of winding and braiding carbon fibers in a tubular shape has a disadvantage in that productivity and efficiency are low, as it takes not only a long process time but also difficulty in deriving precise specifications such as diameters.

더불어, 드라이브샤프트는 고속회전시 발생하는 비틀림 토크와 차량의 주행중 작용하는 외부 충격 등 스트레스가 크게 작용하는 부위이므로 특히 이종 소재로 이루어진 샤프트튜브와 스텁샤프트 간의 안정적인 결합구조를 구현하는 것은 매우 중요하다.In addition, since the drive shaft is a site in which stress such as torsional torque generated during high-speed rotation and external impact applied while driving the vehicle, it is very important to realize a stable coupling structure between the shaft tube and the stub shaft made of different materials.

그러나, 종래 기술이 적용되는 드라이브샤프트는 샤프트튜브를 스텁샤프트에 단순 억지 삽입하거나, 혹은 압입 조인트 및 아우터 칼라를 이용해 고정하는 형태로 결합구조를 형성하므로, 압입력에 의해 해당 부위에 손괴가 발생할 가능성을 배제할 수 없고 장기간 사용시 스트레스가 파손 부위에 집중되어 균열을 가속하고 결합력이 약화되는 결과를 초래할 수 있다.However, the drive shaft to which the prior art is applied forms a coupling structure in which the shaft tube is simply forcibly inserted into the stub shaft or fixed using a press-fit joint and an outer collar. It can not be excluded and the stress can be concentrated in the site of failure for a long time, resulting in accelerated cracking and weakening of the bonding force.

이에 본 발명에서는 상술한 바와 같은 종래 기술의 문제점을 해결하기 위하여 발명한 것으로서,Therefore, the present invention is invented to solve the problems of the prior art as described above,

금속 재질의 한 쌍의 스텁샤프트(110)와, 스텁샤프트(110)의 사이에 양단을 결합하는 CFRP 재질의 샤프트튜브(120)로 이루어지는 자동차용 CFRP 드라이브샤프트 제조방법에 있어서,In a method for manufacturing a CFRP drive shaft for automobiles comprising a pair of stub shafts 110 made of metal and a shaft tube 120 made of CFRP material which is coupled at both ends between the stub shafts 110,

스텁샤프트(110)를 주조 성형하되, 삽입부(112)의 내주면에 다각형상의 내형으로 이루어진 접합부(113)를 일체로 성형하여 스텁샤프트(110)를 형성하는 접합부성형공정(S10);A stub shaft forming step (S10) for casting and molding the stub shaft (110) by integrally molding a joint (113) consisting of a polygonal internal shape on an inner circumferential surface of the inserting portion (112);

탄소섬유를 수지에 함침하여 형성하는 프리프레그를 일정 두께로 적층하여 튜브시트를 형성하는 튜브시트형성공정(S20);A tube sheet forming step (S20) of forming a tube sheet by laminating a prepreg formed by impregnating carbon fibers with a resin to a predetermined thickness;

상기 튜브시트를 원통체 형상으로 권취하여 엣지부를 봉합하고 튜브체를 형성하는 튜브체형성공정(S30);A tube body forming step (S30) of winding the tube sheet into a cylindrical shape to seal an edge portion and forming a tube body;

상기 튜브체를 샤프트튜브 길이에 상응하도록 절단하여 예비튜브를 형성하는 예비튜브형성공정(S40);A preliminary tube forming step (S40) of forming the preliminary tube by cutting the tube body to correspond to the shaft tube length;

상기 예비튜브의 양단을 핫 프레스에 투입하고, 상기 접합부(113)에 상응하는 다각형상의 외형 및 내형으로 이루어진 접합튜브(121)를 양단에 일체로 성형하여 샤프트튜브(120)를 형성하는 접합튜브성형공정(S50); 및Both ends of the preliminary tube are introduced into a hot press, and a joint tube molding for forming the shaft tube 120 by integrally molding the joint tube 121 having a polygonal shape and an inner shape corresponding to the joint part 113 to both ends. Step (S50); And

상기 샤프트튜브(120)의 접합튜브(121) 외주면에 접착수단을 도포하고 스텁샤프트(110)의 접합부(113)에 삽입하여 고정하는 결합공정(S60);를 포함하여 이루어짐으로써 이종 재질로 이루어진 샤프트튜브와 스텁샤프트 간에 견고한 결합구조를 구현하는 드라이브샤프트를 간편하게 제조할 수 있는 목적 달성이 가능하다.Shaft made of a heterogeneous material by including; bonding step (S60) for applying the adhesive means to the outer peripheral surface of the junction tube 121 of the shaft tube 120 and inserted into and fixed to the junction portion 113 of the stub shaft 110 It is possible to achieve the purpose of easily manufacturing a drive shaft that realizes a rigid coupling structure between the tube and the stub shaft.

본 발명은 CFRP 재질의 샤프트튜브를 보다 간편하게 성형하고 금속 재질로 이루어진 스텁샤프트와의 결합구조를 견고하게 구현하도록 하는 드라이브샤프트 제조방법을 제공하는 효과가 있다.The present invention has the effect of providing a drive shaft manufacturing method to more easily form a shaft tube made of CFRP material and firmly implement a coupling structure with a stub shaft made of a metal material.

즉, 본 발명은 종래 탄소섬유를 와인딩 및 브레이딩하여 관체형으로 재직하는 방식에 비해 탄소섬유 프리프레그를 이용해 형성하는 튜브시트를 권취하는 방식에 의해 샤프트튜브를 형성하므로 시스템을 간소화하고 공정을 효율화할 수 있는 이점이 있다.That is, the present invention simplifies the system and streamlines the process because the shaft tube is formed by winding a tube sheet formed by using carbon fiber prepreg, compared to the method of winding and braiding carbon fiber to serve as a tubular shape. There is an advantage to this.

또한, 본 발명은 종래 기술에서 이종 재질로 이루어진 샤프트튜브와 스텁샤프트간의 억지 압입 구조로 인한 결합부위의 변형 및 손상, 결합력의 약화에 따른 기능성 저하 등과 같은 제반 문제점을 해소하고, 보다 간편한 결합공정이 가능하면서 비틀림 토크 및 강력한 진동에 의한 스트레스가 작용하더라도 견고한 결합력 및 내구성을 도출할 수 있도록 구성하여 드라이브샤프트의 품질을 향상하고 수명을 연장할 수 있는 등의 다양한 이점이 있다.In addition, the present invention solves all the problems such as deformation and damage of the coupling portion due to the interference indentation structure between the shaft tube and the stub shaft made of different materials in the prior art, such as functional degradation due to weakening of the coupling force, and more convenient coupling process It is possible to improve the quality of the drive shaft and to extend the life of the drive shaft by configuring it to achieve a strong coupling force and durability even under stress caused by torsional torque and strong vibration.

도 1은 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법의 공정 흐름도.
도 2는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 사시도.
도 3은 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 분해 사시도.
도 4는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트의 스텁샤프트 사시도(a) 및 측면도(b).
도 5는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 평면도.
도 6은 도 5의 A-A선을 따라서 취한 단면 사시도.
도 7은 도 5의 B-B선을 따라서 취한 단면도.1 is a process flow diagram of a method for manufacturing a CFRP drive shaft for a vehicle according to the present invention.
Figure 2 is a perspective view of the drive shaft manufactured according to the CFRP drive shaft manufacturing method for automobiles according to the present invention.
Figure 3 is an exploded perspective view of a drive shaft manufactured according to the CFRP drive shaft manufacturing method for automobiles according to the present invention.
Figure 4 is a perspective view (a) and side view (b) of the stub shaft of the drive shaft manufactured according to the CFRP drive shaft manufacturing method for automobiles according to the present invention.
Figure 5 is a plan view of the drive shaft manufactured according to the CFRP drive shaft manufacturing method for automobiles according to the present invention.
6 is a sectional perspective view taken along the line AA of FIG. 5.
7 is a cross-sectional view taken along the line BB of FIG.

이하, 본 발명의 자동차용 CFRP 드라이브샤프트 제조방법의 바람직한 실시 예에 따른 구성과 작용을 첨부 도면을 참조하여 상세히 설명하면 다음과 같다. 하기의 설명에서 당해 기술분야의 통상의 기술자가 용이하게 구현할 수 있는 부분에 대한 구체적인 설명은 생략될 수 있다. 아울러 하기 설명은 본 발명에 대하여 바람직한 실시 예를 들어 설명하는 것이므로 본 발명은 하기 실시 예에 의해 한정되는 것이 아니며 본 발명의 범주를 벗어나지 않는 범위 내에서 다양한 변형이 제공될 수 있음은 당연하다 할 것이다.Hereinafter, with reference to the accompanying drawings, the configuration and operation according to a preferred embodiment of the CFRP drive shaft manufacturing method for automobiles of the present invention will be described in detail. In the following description, a detailed description of parts that can be easily implemented by those skilled in the art may be omitted. In addition, the following description is to be described for the present invention with reference to the preferred embodiment is not limited by the following examples and it will be obvious that various modifications can be provided within the scope without departing from the scope of the present invention. .

도 1은 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법의 공정 흐름도, 도 2는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 사시도, 도 3은 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 분해 사시도, 도 4는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트의 스텁샤프트 사시도(a) 및 측면도(b), 도 5는 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법에 따라 제조된 드라이브샤프트 평면도, 도 6은 도 5의 A-A선을 따라서 취한 단면 사시도, 도 7은 도 5의 B-B선을 따라서 취한 단면도를 도시한 것이다.1 is a process flowchart of a method for manufacturing a vehicle CFRP drive shaft according to the present invention, Figure 2 is a perspective view of a drive shaft manufactured according to a method for manufacturing a vehicle CFRP drive shaft according to the present invention, Figure 3 is a CFRP for automobiles according to the present invention Drive shaft exploded perspective view manufactured according to the drive shaft manufacturing method, Figure 4 is a stub shaft perspective view (a) and side view (b) of the drive shaft manufactured according to the CFRP drive shaft manufacturing method for automobiles according to the present invention, Figure 5 A plan view of a drive shaft manufactured according to a method for manufacturing a vehicle CFRP drive shaft according to the present invention, FIG. 6 is a sectional perspective view taken along line AA of FIG. 5, and FIG. 7 is a sectional view taken along line BB of FIG. 5.

본 발명의 기술이 적용되는 자동차용 CFRP 드라이브샤프트 제조방법은 엔진의 구동력을 바퀴에 전달해 주는 역할을 하는 드라이브샤프트(100)를 제조함에 있어, CFRP 재질로 이루어진 샤프트튜브(120)의 성형을 위한 일련의 공정을 효율화하면서 금속 재질로 이루어진 스텁샤프트(110)와 보다 견고한 결합관계를 구현하도록 구성하여 고품질의 드라이브샤프트(100)를 제조하도록 하는 기술에 관한 것임을 주지한다.CFRP drive shaft manufacturing method for automobiles to which the technology of the present invention is applied in manufacturing a drive shaft 100 that serves to transfer the driving force of the engine to the wheel, a series for forming the shaft tube 120 made of CFRP material Note that the present invention relates to a technology for manufacturing a high quality drive shaft 100 by implementing a more robust coupling relationship with the stub shaft 110 made of a metal material while improving the efficiency of the process.

이를 위한 본 발명의 자동차용 CFRP 드라이브샤프트 제조방법은 금속 재질의 한 쌍의 스텁샤프트(110)와, 스텁샤프트(110)의 사이에 양단을 결합하는 CFRP 재질의 샤프트튜브(120)로 이루어지는 자동차용 CFRP 드라이브샤프트 제조방법에 있어서, 도 1에 도시한 바와 같이 크게 스텁샤프트(110)를 형성하기 위한 접합부성형공정(S10)과, 샤프트튜브(120)를 형성하기 위한 튜브시트형성공정(S20), 튜브체형성공정(S30), 예비튜브형성공정(S40), 접합튜브성형공정(S50)과, 스텁샤프트(110)와 샤프트튜브(120)를 결합하기 위한 결합공정(S60)을 포함하여 이루어지며, 구체적으로는 하기와 같다.CFRP drive shaft manufacturing method for automobiles of the present invention for this purpose is composed of a pair of stub shafts of a metal material, and the shaft tube 120 of CFRP material coupling both ends between the stub shaft (110) In the CFRP drive shaft manufacturing method, as shown in Fig. 1, the joint forming process (S10) for forming the stub shaft 110, the tube sheet forming process (S20) for forming the shaft tube 120, It comprises a tube body forming step (S30), preliminary tube forming step (S40), junction tube forming step (S50), and the coupling step (S60) for coupling the stub shaft 110 and the shaft tube 120, Specifically, it is as follows.

상기 접합부성형공정(S10)은 스텁샤프트(110)를 주조 성형하되, 삽입부(112)의 내주면에 다각형상의 내형으로 이루어진 접합부(113)를 일체로 성형하여 스텁샤프트(110)를 형성하는 공정이다.The joint forming process (S10) is a process of casting and molding the stub shaft 110, forming a stub shaft 110 by integrally molding a joint 113 made of a polygonal inner mold on the inner peripheral surface of the insertion portion (112). .

통상적인 드라이브샤프트의 샤프트튜브(120)는 원통체 형상의 솔리드, 혹은 튜브상으로 이루어진다. 따라서, 스텁샤프트(110) 역시 샤프트튜브(120)를 결합하는 원통체 형상의 삽입부(112)와, 파이널 드라이브 또는 바퀴에 결합하는 스플라인(111)을 일체로 형성하도록 성형되며 금속재를 이용한 주조법에 의해 제조된다.The shaft tube 120 of a conventional drive shaft is made of a solid or tubular in the shape of a cylinder. Therefore, the stub shaft 110 is also formed to integrally form the cylindrical portion-shaped insertion portion 112 for coupling the shaft tube 120, and the spline 111 for coupling to the final drive or wheel, and in the casting method using a metal material Is manufactured by.

본 발명의 상기 접합부성형공정(S10)에서는 후술하게 될 샤프트튜브(120)와 스텁샤프트(110) 간의 견고한 결합구조를 구현하도록 주조 과정에서 코어금형의 구조를 차별하여 스텁샤프트(110)에 도 4에 도시한 바와 같이 다각형상의 접합부(113)를 성형하도록 구성한다.In the joint forming process (S10) of the present invention to differentiate the structure of the core mold in the casting process to implement a rigid coupling structure between the shaft tube 120 and the stub shaft 110 which will be described later in Figure 4 on the stub shaft 110 As shown in FIG. 2, the polygonal junction 113 is formed.

상기 접합부성형공정(S10)에 의해 형성되는 접합부(113)는 다각형상의 내형을 형성하여 복수의 내측접합면(114)을 환형으로 배치하도록 마련된다. 상기 접합부(113)의 내측접합면(114)은 삽입부(112)의 내주면에서 외주면을 향해 요입된 위치에 구비하므로 소정의 단차를 형성하게 된다.The junction part 113 formed by the junction part molding process S10 is provided to form a polygonal inner mold to arrange the plurality of inner junction surfaces 114 in an annular shape. Since the inner junction surface 114 of the junction portion 113 is provided at a position concaved toward the outer peripheral surface from the inner peripheral surface of the insertion portion 112 to form a predetermined step.

상기 튜브시트형성공정(S20)은 탄소섬유를 수지에 함침하여 형성하는 프리프레그를 일정 두께로 적층하여 튜브시트를 형성하는 공정이다.The tube sheet forming step (S20) is a step of forming a tube sheet by laminating a prepreg formed by impregnating carbon fibers with a resin to a predetermined thickness.

프리프레그는 탄소섬유에 열경화성 매트릭스 수지를 함침한 예비 가공재로써, 상기 튜브시트형성공정(S20)에서는 프리프레그를 시트상으로 적층하되 샤프트튜브(120)의 내,외경간 두께에 상응하는 두께로 적층하는 방식에 의해 튜브시트를 형성한다. 따라서, 종래 기술에서와 같은 와인딩 및 브레이딩과 같은 재직 공정을 배제하므로 공정을 간소화할 수 있다.Prepreg is a pre-processed material impregnated with a thermosetting matrix resin in the carbon fiber, in the tube sheet forming step (S20) to the prepreg laminated in the form of a sheet, but laminated in a thickness corresponding to the thickness between the inner and outer diameter of the shaft tube 120 The tube sheet is formed by the method. Therefore, the process can be simplified by eliminating in-service processes such as winding and braiding as in the prior art.

상기 튜브체형성공정(S30)에서는 상기 튜브시트를 원통체 형상으로 권취하여 엣지부를 봉합하고 튜브체를 형성하는 공정이다.In the tube body forming step (S30), the tube sheet is wound in a cylindrical shape to seal an edge portion to form a tube body.

상기 튜브체형성공정(S30)에서는 샤프트튜브(120)의 내경에 상응하는 외경을 형성하는 권취롤러에 튜브시트를 감아 열고정 또는 접착제를 이용해 양 단면상의 엣지부를 봉합하여 튜브 형상으로 형성한다.In the tube body forming step (S30), the tube sheet is wound around a winding roller that forms an outer diameter corresponding to the inner diameter of the shaft tube 120, and the edge portions on both cross sections are sealed to form a tube shape by heat-setting or adhesive.

상기 예비튜브형성공정(S40)에서는 상기 튜브체를 샤프트튜브(120) 길이에 상응하도록 절단하여 예비튜브를 형성하는 공정이다. 본 발명의 상기와 같은 튜브체형성공정(S30) 및 예비튜브형성공정(S40)에 의해 종래 기술의 재직 방식에 비해 정밀한 규격으로 샤프트튜브(120)를 용이하게 성형하는 것이 가능하다 할 것이다.In the preliminary tube forming step (S40), the tube body is cut to correspond to the length of the shaft tube 120 to form a preliminary tube. By the tube body forming step (S30) and the preliminary tube forming step (S40) of the present invention it will be possible to easily mold the shaft tube 120 to a precise standard compared to the prior art weaving method.

한편, 상기 접합튜브성형공정(S50)에서는 상기 예비튜브의 양단을 핫 프레스에 투입하고, 상기 접합부(113)에 상응하는 다각형상의 외형, 및 외형에 상응하는 소직경의 다각형상의 내형으로 이루어진 접합튜브(121)를 양단에 일체로 성형하여 샤프트튜브(120)를 형성하는 공정이다.Meanwhile, in the joining tube forming step (S50), both ends of the preliminary tube are put into a hot press, and the joining tube includes a polygonal outer shape corresponding to the joining part 113 and a polygonal inner shape of a small diameter corresponding to the outer shape. It is a process of forming the shaft tube 120 by integrally molding 121 at both ends.

상기 접합튜브성형공정(S50)에 적용되는 핫 프레스 장치는 히팅 플레이트가 결합되어 가열된 상, 하부 몰드의 내형을 다각형상으로 구비하고, 상, 하부 몰드의 사이에 탑재하는 코어금형의 외형을 다각형상으로 구비한다.The hot press apparatus applied to the joining tube forming process (S50) has a polygonal shape of the upper and lower molds in which the heating plate is coupled and heated, and a polygonal shape of the core mold mounted between the upper and lower molds. It is equipped with a phase.

따라서, 상, 하부 몰드의 사이에 상기 예비튜브를 안치하고 예비튜브의 내측에 코어금형이 위치한 상태에서 가압하면서 소결하여 접합튜브(121)를 성형한다.Therefore, the preliminary tube is placed between the upper and lower molds and sintered under pressure while the core mold is positioned inside the preliminary tube to form the joining tube 121.

상기 접합튜브성형공정(S50)에서는 핫 프레스의 온도를 210℃로 설정하고 120분 동안 예비튜브의 양단을 소결하여 고밀도화된 접합튜브(121)를 성형한다. 상기 온도 및 시간 범위를 벗어날 경우 치수안정성이 저하되어 다각형상으로의 열변형이 이루어지지 않거나 강도변화가 초래될 수 있으므로 해당 조건을 준수한다.In the joining tube forming step (S50), the temperature of the hot press is set to 210 ° C., and both ends of the preliminary tube are sintered for 120 minutes to form the densified junction tube 121. If the temperature and time are out of the range, the dimensional stability is lowered, so that the thermal deformation on the polygonal shape is not made or the strength may be changed.

상기 접합튜브성형공정(S50)에 의해 형성되는 접합튜브(121)는 도 3 또는 도 7에 도시한 바와 같이 다각형상의 외형 및 내형을 형성하여 복수의 외측접합면(122)을 환형으로 배치하도록 마련된다.The junction tube 121 formed by the junction tube molding step S50 is formed to form a polygonal outer shape and an inner shape as illustrated in FIG. 3 or 7 to arrange the plurality of outer junction surfaces 122 in an annular shape. do.

상기 결합공정(S60)은 상기 샤프트튜브(120)의 접합튜브(121) 외주면에 접착수단을 도포하고 스텁샤프트(110)의 접합부(113)에 삽입하여 고정하는 공정이다.The coupling step (S60) is a step of applying the adhesive means to the outer peripheral surface of the bonding tube 121 of the shaft tube 120 and inserting and fixing to the bonding portion 113 of the stub shaft 110.

상기 접합부성형공정(S10)에 의해 스텁샤프트(110)에 형성한 접합부(113)의 내측접합면(114)과, 상기 접합튜브성형공정(S50)에 의해 샤프트튜브(120)에 형성한 접합튜브(121)의 외측접합면(122)은 접착수단(미도시)을 사이에 두고 상호 대향하면서 지지력을 발휘하여 고정된다.The inner joining surface 114 of the joining portion 113 formed on the stub shaft 110 by the joining part forming step (S10) and the joining tube formed on the shaft tube 120 by the joining tube forming step (S50). The outer bonding surface 122 of the 121 is fixed by exerting a supporting force while facing each other with an adhesive means (not shown) therebetween.

상기 결합공정(S60)에서는 스텁샤프트(110)의 접합부(113)와 샤프트튜브(120)의 접합튜브(121)가 당접하는 접합면의 길이(H)를 도 3에서와 같이 스텁샤프트(110)의 삽입부(112) 길이의 1/2이상이 되도록 삽입하여 고정한다.In the coupling step (S60), the stub shaft 110, as shown in Fig. 3, the length H of the joint surface that the junction portion 113 of the stub shaft 110 and the junction tube 121 of the shaft tube 120 abuts. The insertion part 112 of the length of the insertion so as to be 1/2 or more and fixed.

본 발명에서는 상기 접합부성형공정(S10)을 통해 스텁샤프트(110)를 형성 시 접합부(113)의 내측접합면(114)을 삽입부(112)의 내주면에서 외주면을 향해 요입하여 도 4의 (a)에 도시한 바와 같이 소정의 단차를 형성하도록 구성함으로써 길이 방향 고정단 역할을 수행하도록 한다. 이때, 접합부(113)에 삽입되는 샤프트튜브(120)의 접합튜브(121)가 비틀림 토크 등이 작용시 내측접합면(114) 및 외측접합면(122) 간에 확고한 지지력을 확보하기 위해서는 일정 수준 이상의 접합면이 도출되어야 한다. 상기 결합공정(S60)에서는 통상의 스텁샤프트(110)의 규격을 고려하여 접합면의 길이(H)를 약 45mm 이상이 되도록 삽입한다.In the present invention, when the stub shaft 110 is formed through the junction forming process (S10), the inner joining surface 114 of the joining portion 113 is recessed from the inner circumferential surface of the inserting portion 112 toward the outer circumferential surface of FIG. As shown in Fig. 2), it is configured to form a predetermined step so as to serve as a longitudinal fixed end. At this time, when the joint tube 121 of the shaft tube 120 inserted into the joint part 113 has a torsional torque or the like, in order to secure a firm supporting force between the inner joint surface 114 and the outer joint surface 122, a predetermined level or more is required. The joint surface should be derived. In the coupling step (S60), the length (H) of the joint surface is inserted to be about 45 mm or more in consideration of the standard of the stub shaft (110).

전술한 바와 같은 구성으로 이루어지는 본 발명의 기술이 적용된 자동차용 CFRP 드라이브샤프트 제조방법에 의해 제조된 드라이브샤프트(100)는 도 2에 도시한 바와 같이 금속 재질의 한 쌍의 스텁샤프트(110) 사이에 CFRP 재질의 샤프트튜브(120)가 결합된 형태로 이루어지며, 특히 스텁샤프트(110)와 샤프트튜브(120)에는 각각 다각형상의 접합부(113) 및 접합튜브(121)를 형성하여 결합구조를 도출한다.As shown in FIG. 2, the drive shaft 100 manufactured by the CFRP drive shaft manufacturing method for automobiles to which the technology of the present invention having the configuration as described above is applied is provided between a pair of stub shafts 110 made of metal. The shaft tube 120 made of CFRP material is combined, and in particular, the stub shaft 110 and the shaft tube 120 form polygonal joints 113 and joint tubes 121 to derive a joint structure. .

본 발명의 실시 예에서는 상기 접합부(113)는 내형을 팔각형상으로 구성하여 8개소에 내측접합면(114)을 환형으로 구비하고, 상기 접합튜브(121)는 외형 및 내형을 팔각형상으로 구성하여 8개소에 외측접합면(122)을 환형으로 구비하는 형태로 구성하였으나 임의의 다각형상으로 구성할 수 있다.In the embodiment of the present invention, the junction portion 113 has an inner shape in an octagonal shape and has an inner joining surface 114 in eight places in an annular shape, and the joining tube 121 has an outer shape and an inner shape in an octagonal shape. The outer bonding surface 122 is formed in an annular shape in eight places, but may be configured in any polygonal shape.

따라서, 도 7에 도시한 바와 같이 상기 접합부(113)의 내측접합면(114)과 접합튜브(121)의 외측접합면(122)이 접착수단(미도시)을 사이에 두고 상호 대향하면서 지지력을 발휘하도록 구성한다.Therefore, as shown in FIG. 7, the inner joining surface 114 of the joining portion 113 and the outer joining surface 122 of the joining tube 121 face each other with an adhesive means (not shown) interposed therebetween. Configure to exert.

아울러, 필요에 따라서 상기 내측접합면(114)에는 하나 또는 그 이상의 기밀홈을 요입 형성하여 내측접합면(114)에 도포되는 접착수단이 외측접합면(122)에 접착됨과 동시에 기밀홈에 충진되면서 더욱 안정적인 결합력 및 내구성을 발휘하도록 구성한다. 더불어 외측접합면(122)에도 기밀홈에 상응하는 기밀돌부를 돌출 형성하여 접착수단과 함께 기밀홈에 수용되도록 구성함으로써 결합력 및 내구성을 더욱 강화할 수도 있을 것이다.In addition, if necessary, the inner bonding surface 114 is formed with one or more airtight grooves, and the adhesive means applied to the inner bonding surface 114 is adhered to the outer bonding surface 122 and at the same time filled in the hermetic groove. Configure for more stable bonding and durability. In addition, by forming an airtight protrusion corresponding to the airtight groove in the outer joining surface 122 to be accommodated in the airtight groove together with the adhesive means, the bonding force and durability may be further strengthened.

이상에서와 같은 본 발명에 따른 자동차용 CFRP 드라이브샤프트 제조방법은 종래 복합소재 드라이브샤프트 제조 기술에서 샤프트튜브(120)를 형성시 탄소섬유를 관체형으로 재직하여 형성하는 방식과 차별하여 탄소섬유 프리프레그로 이루어진 튜브시트를 권취하는 방식에 의해 샤프트튜브(120)를 형성하므로 종래 와인딩 및 브레이딩과 같은 시스템을 배제하여 간소화하고 공정을 효율화할 수 있는 이점이 있다.CFRP drive shaft manufacturing method for automobiles according to the present invention as described above is different from the carbon fiber prepreg to form the carbon fiber in the tubular form when forming the shaft tube 120 in the conventional composite drive shaft manufacturing technology Since the shaft tube 120 is formed by a method of winding a tube sheet, the system has the advantage of simplification and efficiency of the process by excluding a system such as a conventional winding and braiding.

또한, 본 발명은 이종 재질로 이루어진 스텁샤프트(110)와 샤프트튜브(120)간의 견고한 결합구조를 도출하기 위하여 금속 재질의 스텁샤프트(110)는 주조 시 다각형상의 접합부(113)를 일체로 형성하고, CFRP재질의 샤프트튜브(120)는 핫 프레스에 의한 소결 방식으로 접합튜브(121)를 형성하여 해당 부위를 용이하게 열변형하면서 고밀도 및 고강도화할 수 있는 방법을 제공함에 따라 작업성 및 생산성 향상 효과를 기대할 수 있다.In addition, the present invention in order to derive a firm coupling structure between the stub shaft 110 and the shaft tube 120 made of different materials, the metal stub shaft 110 is integrally formed with a polygonal joint 113 when casting , CFRP material shaft tube 120 forms a joint tube 121 by sintering method by hot press to provide a method that can easily heat deformation the corresponding portion while increasing the density and high strength, workability and productivity improvement effect You can expect.

따라서, 본 발명은 종래 기술에 비해 결합부위의 변형 및 손상, 결합력의 약화에 따른 기능성 저하 등과 같은 제반 문제점을 해소하고, 보다 간편한 결합공정(S60)이 가능하고, 종래 원통체 구조에 비해 비틀림 토크 등에 효과적으로 대응할 수 있는 결합력 및 내구성을 도출할 수 있는 고품질의 드라이브샤프트(100)를 간편하게 제조할 수 있으므로 산업상 이용 가능성이 클 것으로 기대된다.Therefore, the present invention solves all the problems such as deformation and damage of the coupling portion, functional degradation due to weakening of the coupling force, and a simpler coupling process (S60) is possible, compared to the prior art, torsional torque compared to the conventional cylindrical structure It is expected that the industrial applicability will be great because it is possible to easily manufacture a high-quality drive shaft 100 capable of effectively eliciting cohesion and durability that can be effectively coped with.

S10: 접합부성형공정
S20: 튜브시트형성공정
S30: 튜브체형성공정
S40: 예비튜브형성공정
S50: 접합튜브성형공정
S60: 결합공정
100: 드라이브샤프트
110: 스텁샤프트
111: 스플라인
112: 삽입부
113: 접합부
114: 내측접합면
120: 샤프트튜브
121: 접합튜브
122: 외측접합면S10: joint forming process
S20: tube sheet forming process
S30: tube body forming process
S40: preliminary tube forming process
S50: bonded tube forming process
S60: joining process
100: drive shaft
110: stub shaft
111: spline
112: insertion unit
113: junction
114: inner junction surface
120: shaft tube
121: junction tube
122: outer face

Claims (4)

금속 재질의 한 쌍의 스텁샤프트(110)와, 스텁샤프트(110)의 사이에 양단을 결합하는 CFRP 재질의 샤프트튜브(120)로 이루어지는 자동차용 CFRP 드라이브샤프트 제조방법에 있어서,
스텁샤프트(110)를 주조 성형하되, 삽입부(112)의 내주면에 다각형상의 내형으로 이루어진 접합부(113)를 일체로 성형하여 스텁샤프트(110)를 형성하는 접합부성형공정(S10);
탄소섬유를 수지에 함침하여 형성하는 프리프레그를 일정 두께로 적층하여 튜브시트를 형성하는 튜브시트형성공정(S20);
상기 튜브시트를 원통체 형상으로 권취하여 엣지부를 봉합하고 튜브체를 형성하는 튜브체형성공정(S30);
상기 튜브체를 샤프트튜브 길이에 상응하도록 절단하여 예비튜브를 형성하는 예비튜브형성공정(S40);
상기 예비튜브의 양단을 핫 프레스에 투입하고, 상기 접합부(113)에 상응하는 다각형상의 외형 및 내형으로 이루어진 접합튜브(121)를 양단에 일체로 성형하여 샤프트튜브(120)를 형성하는 접합튜브성형공정(S50); 및
상기 샤프트튜브(120)의 접합튜브(121) 외주면에 접착수단을 도포하고 스텁샤프트(110)의 접합부(113)에 삽입하여 고정하는 결합공정(S60);를 포함하여 이루어지는 것을 특징으로 하는 자동차용 CFRP 드라이브샤프트 제조방법.In a method for manufacturing a CFRP drive shaft for automobiles comprising a pair of stub shafts 110 made of metal and a shaft tube 120 made of CFRP material which is coupled at both ends between the stub shafts 110,
A stub shaft forming step (S10) for casting and molding the stub shaft (110) by integrally molding a joint (113) consisting of a polygonal internal shape on an inner circumferential surface of the inserting portion (112);
A tube sheet forming step (S20) of forming a tube sheet by laminating a prepreg formed by impregnating carbon fibers with a resin to a predetermined thickness;
A tube body forming step (S30) of winding the tube sheet into a cylindrical shape to seal an edge portion and forming a tube body;
A preliminary tube forming step (S40) of forming the preliminary tube by cutting the tube body to correspond to the shaft tube length;
Both ends of the preliminary tube are introduced into a hot press, and a joint tube molding for forming the shaft tube 120 by integrally molding the joint tube 121 having a polygonal shape and an inner shape corresponding to the joint part 113 to both ends. Step (S50); And
And a joining process (S60) for applying an adhesive means to the outer circumferential surface of the joining tube 121 of the shaft tube 120 and inserting and fixing the joining portion 113 of the stub shaft 110. CFRP drive shaft manufacturing method. 제 1 항에 있어서,
상기 접합튜브성형공정(S50)에서는,
핫 프레스의 온도를 210℃로 설정하고 120분 동안 예비튜브의 양단을 소결하여 접합튜브(121)를 성형하도록 이루어지는 것을 특징으로 하는 자동차용 CFRP 드라이브샤프트 제조방법.The method of claim 1,
In the junction tube forming step (S50),
Method of manufacturing a CFRP drive shaft for a vehicle, characterized in that the temperature of the hot press is set to 210 ℃ and sintering both ends of the preliminary tube for 120 minutes to form a joining tube (121). 제 1 항에 있어서,
상기 결합공정(S60)에서는,
스텁샤프트(110)의 접합부(113)와 샤프트튜브(120)의 접합튜브(121)가 당접하는 접합면의 길이(H)를 스텁샤프트(110)의 삽입부(112) 길이의 1/2이상인 것을 특징으로 하는 자동차용 CFRP 드라이브샤프트 제조방법.The method of claim 1,
In the bonding step (S60),
The length H of the joint surface that the junction 113 of the stub shaft 110 and the junction tube 121 of the shaft tube 120 abut is not less than 1/2 the length of the insertion portion 112 of the stub shaft 110. CFRP drive shaft manufacturing method for an automobile, characterized in that. 제 1 항 내지 제 3 항 중 어느 하나의 항에 의해 제조된 것을 특징으로 하는 자동차용 CFRP 드라이브샤프트.A CFRP drive shaft for a vehicle, which is manufactured according to any one of claims 1 to 3.
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