KR20000022405A - Method for producing a lightweight steering wheel - Google Patents

Method for producing a lightweight steering wheel Download PDF

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Publication number
KR20000022405A
KR20000022405A KR1019980710837A KR19980710837A KR20000022405A KR 20000022405 A KR20000022405 A KR 20000022405A KR 1019980710837 A KR1019980710837 A KR 1019980710837A KR 19980710837 A KR19980710837 A KR 19980710837A KR 20000022405 A KR20000022405 A KR 20000022405A
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KR
South Korea
Prior art keywords
steering wheel
granules
mold
heated
wheel body
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KR1019980710837A
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Korean (ko)
Inventor
마르틴 크로이저
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포흐 롤프;그로테 클라우스
티알더블유 오토모티브 세이프티 시스템즈 게엠베하 운트코. 카게
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Application filed by 포흐 롤프;그로테 클라우스, 티알더블유 오토모티브 세이프티 시스템즈 게엠베하 운트코. 카게 filed Critical 포흐 롤프;그로테 클라우스
Publication of KR20000022405A publication Critical patent/KR20000022405A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/04—Hand wheels
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/06—Making multilayered articles
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE: A method for producing a lightweight steering wheel is provided to produce a steering wheel which has clearly smaller mass-moment of inertia, and is the same level in the operation and the safety and does not indicate disadvantages in all functional, feel and aesthetic interests comparing with the existing steering wheel. CONSTITUTION: A process is disclosed for casting a plastic material around a metallic steering wheel skeleton. The process is characterized in that the steering wheel skeleton and a predetermined amount of a thermomer plastic granulate, in particular polypropylene or polyethylene, mixed with foaming agents, are introduced into a steering wheel mould, and the granulate is heated up to at least 100°C. The granulate particles are foamed, molten and bonded within the steering wheel mould, forming a steering wheel body which surrounds the steering wheel skeleton. The steering wheel body is foamed within, outwardly provided with a substantially closed surface and has a specific density of less than 0.4 g/cubic centimeter.

Description

경량의 조향 휠의 제조 방법Manufacturing method of light weight steering wheel

상기 방법은 오랫 동안 공지되어 왔다. 초기에는, CAB나 PVC와 같은 비밀도(比密度; specific density)가 1.18 내지 1.39 g/cm3인 열경화성 재료가 사용되었다. 상용 차량의 경우, 사출 성형된 폴리프로필렌 재질의 외피가 여전히 사용되고 있는데, 이것은 비밀도가 0.89 내지 0.93 g/cm3이다. 승용(乘用) 차량에 있어서, 이들 재료는 대부분 폴리우레탄에 의해 대체되었으며, 팽창제를 혼합하여 이로부터 소위 일체형 발포 구조체가 생산될 수 있고, 그 내부에 미소 다공(微小多孔; microcellular) 구조가 있는 중핵부는 조밀하며 대부분 무공성(無孔性; pore-free)이고 촉감이 뛰어난 외피(casing)에 의해 둘러싸여 있다. 이에 따라, 비밀도가 0.8 g/cm3가량인 조향 휠 외피가 실현된다.The method has been known for a long time. Initially, thermosetting materials with a specific density of 1.18 to 1.39 g / cm 3 , such as CAB or PVC, were used. For commercial vehicles, an injection molded polypropylene sheath is still used, which has an air tightness of 0.89 to 0.93 g / cm 3 . In passenger vehicles, most of these materials have been replaced by polyurethane, and so-called monolithic foam structures can be produced from the incorporation of an expanding agent, with a microcellular structure therein. The core is dense and mostly surrounded by a pore-free, tactile casing. As a result, a steering wheel shell having a secretness of about 0.8 g / cm 3 is realized.

최근의 승용 차량에 있어서, 조향 시스템의 매개 변수들은 고도의 주행 안전성과 관련하여 서로에 대하여 매우 정밀하게 조정되므로, 비록 작은 변화라도 운전자에게는 장애로 느껴진다. 대다수의 경우, 구체적으로는 전륜 구동의 경우, 조향 시스템은 조향 휠의 질량 관성 모멘트를 감소시켜 추가로 개선될 수 있다. 베어링 조향 휠 구조, 즉 구체적으로는 조향 휠 골격 구조의 재료비는 조작 및 사고와 관련하여 안전성을 제한하는 일이 없이 더 줄일 수 없기 때문에, 상기 외피의 관성 질량을 추가로 감소시키는 일은 상당히 중요하다.In modern passenger vehicles, the parameters of the steering system are very precisely adjusted with respect to each other with respect to high driving safety, so even small changes are seen as a barrier to the driver. In most cases, particularly in front wheel drive, the steering system can be further improved by reducing the mass moment of inertia of the steering wheel. Since the material cost of the bearing steering wheel structure, specifically the steering wheel skeleton structure, cannot be further reduced without limiting safety with respect to operation and accidents, further reduction of the inertia mass of the shell is of great importance.

본 발명은 성형 기술에 의해 금속제 조향 휠 골격 구조를 플라스틱으로 봉입(封入; encasing)시킴으로써 관성 모멘트가 작은 조향 휠을 제조하는 방법에 관한 것이다.The present invention relates to a method for producing a steering wheel with a small moment of inertia by encasing a metal steering wheel skeleton structure by plastic by a molding technique.

따라서, 다른 어떤 점에서도 불이익을 감수하는 일이 없이 성형 기술에 의해 조향 휠의 질량 관성 모멘트를 더 줄일 수 있는 방식으로 조향 휠 골격 구조를 봉입시키는 공지의 방법을 더 개선하는 것에 본 발명의 목적이 있다. 다시 말하면, 현재의 승용 차량용의 기존의 조향 휠과 조작 및 안전성의 면에서 기술적으로 적어도 동일한 수준이고, 상기 기준과 비교시 기능, 촉감 및 미적 관점에서 어떠한 결점도 없는 반면에 질량 관성 모멘트가 현저히 작은 조향 휠을 제조하고자 한다.Accordingly, it is an object of the present invention to further improve the known method of encapsulating the steering wheel skeleton structure in such a way that the mass moment of inertia of the steering wheel can be further reduced by the molding technique without any disadvantages in any respect. have. In other words, it is technically at least the same level of operation and safety as existing steering wheels for current passenger vehicles, and has no drawbacks in terms of function, tactile and aesthetic in comparison with the above criteria, while the moment of inertia of the mass is significantly smaller. To manufacture a steering wheel.

상기 과제는 조향 휠 골격 구조와, 특히 폴리프로필렌 또는 폴리에틸렌과 같은 열경화성 플라스틱으로 구성되고 팽창제와 혼합된 과립체를 소정의 양으로 조향 휠 주형 내에 투입하는 공정과, 이 과립체를 최소한 100℃로 가열하는 공정과, 그리고 상기 조향 휠 주형 내에서 상기 과립체 입자들을 팽창, 용융 및 결합시켜서, 내부는 발포되어 있고 외부에는 실질적으로 폐쇄(발포되지 않은) 표면이 생성되며, 비밀도가 0.4 g/cm3이하인 상기 조향 휠 골격 구조를 둘러싸는 조향 휠 본체부를 성형하는 공정에 의하여 해결된다.The task is to steer a steering wheel skeleton structure, in particular a granule composed of a thermosetting plastic such as polypropylene or polyethylene and mixed with an expanding agent in a predetermined amount into the steering wheel mold, and heating the granule to at least 100 ° C. And expanding, melting, and coalescing the granulated particles in the steering wheel mold to produce a foamed interior and substantially closed (non-foamed) surface on the outside, with a secretness of 0.4 g / cm It solves by the process of shape | molding the steering wheel main body part which surrounds the said steering wheel skeleton structure which is three or less.

봉입 재료의 비밀도를 종전의 폴리프로필렌의 일체형 발포체에 대하여 가장 좋은 수치에 비하여 반 또는 그 이하로 낮추면, 본 발명에 따라 가공 처리한 재료의 전부가 조향 휠 링 내에 배열되기 때문에, 조향 휠 골격 구조용 재료비를 동일하게 유지하면서 조향 휠의 질량 관성 모멘트는 크게 감소시킬 수 있다.Lowering the degree of encapsulation of the encapsulating material to half or even lower than the best value for the integral foam of polypropylene in the past, for steering wheel skeletal construction, because all of the material processed according to the invention is arranged in the steering wheel ring. The mass moment of inertia of the steering wheel can be greatly reduced while keeping the material costs the same.

조향 휠의 무게를 줄이는 것은 차량 구조의 무게를 줄이고자 하는 일반적인 경제적 목표도 역시 충족시킨다. 그 밖에, 사용되는 재료는 고가의 처리 비용을 들이지 않고 재활용될 수 있으므로, 그 재료의 사용은 생태학적 관점에서도 또한 환영받는다.Reducing the weight of the steering wheel also meets the general economic goals of reducing the weight of the vehicle structure. In addition, the materials used can be recycled without incurring expensive processing costs, so the use of the materials is also welcome from an ecological point of view.

종속항 제2항 내지 제8항에 있어서, 다양한 유리한 변형례가 기재되어 있는데, 변형례는 모두 본 발명의 기본 사상에 기초하는 것이고, 이 사상에 따라 조향 휠 피층부(皮層部)는 역시 발포 가능한 열경화성 플라스틱으로부터 제조될 수 있다.Various advantageous variants are described according to claims 2 to 8, all of which are based on the basic idea of the invention, in which the steering wheel cortex is also foamed. It can be made from possible thermosetting plastics.

이와 같이 함으로써, 역시 용이하고 충분히 내마모성이며 대다수의 경우 감촉이 좋은 조밀한 표면이 실현되는데, 이 표면은 물론 공지의 방식으로 전체 또는 그 일부를 가죽, 나무 합판 또는 이와 유사한 재질의 피층으로 피착시킬 수 있다. 대량 생산용으로는, 종속항 제9항 내지 제13항에 기재된 바와 같이 2차 조작 공정 중에 적절한 플라스틱제 피층을 피착시킬 수도 있다.By doing so, a compact surface, which is also easy, sufficiently wear-resistant and in most cases good to the touch, is realized, which can, of course, be coated in whole or in part by a known layer of leather, plywood or similar material. have. For mass production, as described in subordinate claims 9 to 13, an appropriate plastic coating layer may be deposited during the secondary operation step.

이에 따라, 한편으로는 질량 관성 모멘트가 특히 작은 조향 휠의 제조가 가능해지며, 다른 한편으로는 어떠한 기능상의 제약을 받는 일이 없이 종래의 모든 표면 세공이 가능해진다.This enables, on the one hand, the manufacture of a steering wheel with a particularly small mass moment of inertia, and on the other hand, all conventional surface pore formations without being subject to any functional constraints.

Claims (13)

금속제 조향 휠 골격 구조를 성형 기술에 의해 플라스틱으로 봉입시켜 질량 관성 모멘트가 작은 조향 휠을 제조하는 방법에 있어서,A method of manufacturing a steering wheel having a small mass moment of inertia by encapsulating a metal steering wheel skeleton structure in plastic by a molding technique 조향 휠 골격 구조부와, 특히 폴리프로필렌 또는 폴리에틸렌과 같은 열경화성 플라스틱으로 구성되고 팽창제와 혼합된 과립체를 소정의 양으로 조향 휠 주형 내에 투입하는 공정과;Introducing a steering wheel skeleton structure and, in particular, a granule composed of a thermosetting plastic such as polypropylene or polyethylene and mixed with an expanding agent into the steering wheel mold in a predetermined amount; 상기 과립체를 최소한 100℃로 가열하는 공정과;Heating the granules to at least 100 ° C .; 조향 휠 주형 내에서 상기 과립체의 입자들을 팽창, 용융 및 결합시켜서 내부는 발포되고 외부에는 실질적으로 폐쇄 표면이 생성되며, 비밀도가 0.4 g/cm3이하인 상기 조향 휠 골격 구조를 둘러싼 조향 휠 본체부를 성형하는 공정Steering wheel body surrounding the steering wheel skeletal structure with a hermeticity of 0.4 g / cm 3 or less, expanding, melting and bonding particles of the granules in a steering wheel mold to foam inside and create a substantially closed surface outside Forming process 으로 이루어진 것을 특징으로 하는 경량의 조향 휠의 제조 방법.Light weight steering wheel manufacturing method characterized in that consisting of. 제1항에 있어서, 상기 과립체는 상기 조향 휠 주형 내에서 유입되는 수증기에 의해 가열되는 것을 특징으로 하는 조향 휠의 제조 방법.The method of claim 1, wherein the granules are heated by water vapor flowing in the steering wheel mold. 제1항에 있어서, 상기 과립체는 상기 조향 휠 주형 내에서 상기 주형 및/또는 상기 조향 휠 골격 구조를 가열함으로써 가열되는 것을 특징으로 하는 조향 휠의 제조 방법.The method of claim 1, wherein the granules are heated by heating the mold and / or the steering wheel skeleton structure in the steering wheel mold. 제1항에 있어서, 상기 과립체는 상기 조향 휠 주형 내에서 전기 에너지에 의해 가열되는 것을 특징으로 하는 조향 휠의 제조 방법.The method of claim 1, wherein the granules are heated by electrical energy in the steering wheel mold. 제1항에 있어서, 상기 과립체는 상기 조향 휠 주형 내에서 진동 에너지에 의해 가열되는 것을 특징으로 하는 조향 휠의 제조 방법.The method of claim 1, wherein the granules are heated by vibration energy in the steering wheel mold. 제1항에 있어서, 상기 과립체는 상기 주형 내부로 유입될 때 가열되는 것을 특징으로 하는 조향 휠의 제조 방법.The method of claim 1, wherein the granules are heated when introduced into the mold. 제6항에 있어서, 상기 과립체의 가열 에너지는 공급 장치의 가열 및/또는 내부의 마찰 및 전단력을 발생시키는 외부의 기계적 힘에 의하여 도입되는 것을 특징으로 하는 조향 휠의 제조 방법.7. The method of claim 6, wherein the heating energy of the granules is introduced by an external mechanical force that generates heating and / or friction and shear forces therein. 제1항 내지 제7항 중의 어느 하나의 항에 있어서, 상기 팽창제는 상기 과립체가 주형 내로 공급되기 직전에 그 과립체에 추가되는 것을 특징으로 하는 조향 휠의 제조 방법.8. A method according to any one of the preceding claims, wherein the expanding agent is added to the granules immediately before the granules are fed into the mold. 제1항 내지 제8항 중의 어느 하나의 항에 있어서, 2차 조작 공정 중에 조향 휠 본체는 그 주위에 성형된 플라스틱 재질, 바람직하게는 폴리우레탄 또는 열가소성 탄성체(elastomer) 기재(基材)의 연질의 내광성 플라스틱 피층으로 피착되는 것을 특징으로 하는 조향 휠의 제조 방법.The steering wheel body according to any one of claims 1 to 8, wherein the steering wheel body is made of a plastic material, preferably a polyurethane or thermoplastic elastomer substrate, molded around the secondary operation process. Method of manufacturing a steering wheel, characterized in that the film is deposited with a light-resistant plastic coating. 제9항에 있어서, 상기 피층은 상기 조향 휠의 제조 직후에 피착되며, 상기 피층재를 통한 열 공급 및 조향 휠 본체 표면의 용융에 의해 조향 휠 본체와 피층 사이에서 화학 결합이 일어나는 것을 특징으로 하는 조향 휠의 제조 방법.10. The method of claim 9, wherein the cortex is deposited immediately after the steering wheel is manufactured, and chemical bonding occurs between the steering wheel body and the cortex by heat supply through the cortical material and melting of the steering wheel body surface. Method of manufacturing a steering wheel. 제9항에 있어서, 상기 피층과 상기 조향 휠 본체 사이에서 실질적인 물리적 결합이 일어나는 것을 특징으로 하는 조향 휠의 제조 방법.10. The method of claim 9, wherein a substantial physical coupling occurs between the cortex and the steering wheel body. 제11항에 있어서, 조면(粗面) 또는 구조면이 있는 조향 휠 본체가 생성되고, 상기 피층은 형상이 고정되는 방식으로 실질적으로 유지되는 것을 특징으로 하는 조향 휠의 제조 방법.12. A method according to claim 11, wherein a steering wheel body having a rough surface or a structural surface is produced and the skin is substantially maintained in a fixed manner. 제11항에 있어서, 상기 피층 재료는 냉각시 고수축성이고, 힘이 고정되는 방식으로 실질적으로 유지되는 것을 특징으로 하는 조향 휠의 제조 방법.12. The method of claim 11 wherein the corrugated material is highly shrinkable upon cooling and is substantially maintained in a manner in which forces are fixed.
KR1019980710837A 1997-05-08 1998-05-06 Method for producing a lightweight steering wheel KR20000022405A (en)

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