KR20100055065A - A housing composition for motor driven power steering and a housing for motor driven power steering fabricated thereby - Google Patents

A housing composition for motor driven power steering and a housing for motor driven power steering fabricated thereby Download PDF

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Publication number
KR20100055065A
KR20100055065A KR1020080113979A KR20080113979A KR20100055065A KR 20100055065 A KR20100055065 A KR 20100055065A KR 1020080113979 A KR1020080113979 A KR 1020080113979A KR 20080113979 A KR20080113979 A KR 20080113979A KR 20100055065 A KR20100055065 A KR 20100055065A
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South Korea
Prior art keywords
power steering
housing
weight
composition
electric power
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KR1020080113979A
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Korean (ko)
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손창희
김대업
김현돈
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현대모비스 주식회사
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Priority to KR1020080113979A priority Critical patent/KR20100055065A/en
Publication of KR20100055065A publication Critical patent/KR20100055065A/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/12—Copolymers of styrene with unsaturated nitriles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/14—Copolymers of styrene with unsaturated esters

Abstract

PURPOSE: A housing composition for an electromotive power steering is provided to reduce the weight of the housing for the electromotive power steering, to obtain excellent mechanical properties, and to prevent the distortion of a size due to heat and moisture. CONSTITUTION: A housing composition for an electromotive power steering comprises a polybutylene terephthalate resin 50-80 weight%, acrylonitrile - styrene - acrylate 10-20 weight%, and a glass fiber 10-30 weight%. The housing composition for the electromotive power steering includes an additive which is selected from a group of a plasticizer, an antioxidant, and their mixture. The additive is included in 0.1-5 weight% to a total weight of the composition.

Description

전동식 파워스티어링용 하우징 조성물 및 이로 제조된 전동식 파워스티어링용 하우징{A HOUSING COMPOSITION FOR MOTOR DRIVEN POWER STEERING AND A HOUSING FOR MOTOR DRIVEN POWER STEERING FABRICATED THEREBY}A housing composition for electric power steering and a housing for electric power steering manufactured therefrom {A HOUSING COMPOSITION FOR MOTOR DRIVEN POWER STEERING AND A HOUSING FOR MOTOR DRIVEN POWER STEERING FABRICATED THEREBY}

본 발명은 전동식 파워스티어링용 하우징 조성물 및 이로 제조된 전동식 파워스티어링용 하우징에 관한 것으로, 보다 상세하게는 경량화가 가능하고 제조비용 절감이 가능한 전동식 파워스티어링용 하우징 조성물에 관한 것이다.The present invention relates to a housing composition for an electric power steering and a housing for an electric power steering manufactured therefrom, and more particularly, to a housing composition for an electric power steering that can be reduced in weight and manufacturing cost can be reduced.

일반적으로, 차량의 조타력이 발생하는 파워 스티어링장치는 핸들의 조작력을 가볍고 원활하게 하면서도 신속한 조향이 가능하도록 하기 위해서 유압을 이용하도록 설계되어 작동된다. 이와 같은, 파워 스티어링장치는 작은 힘으로 조향조작을 할 수 있으며 조향 기어비를 조작력에 관계없이 선정할 수 있다. 또한, 파워 스티어링장치는 노면의 요철에서 오는 충격을 흡수하여 핸들에 전달되는 것을 방지할 수 있는 이점이 있다.In general, a power steering device in which steering power of a vehicle is generated is designed and operated to use hydraulic pressure in order to enable quick steering while lightly and smoothly operating a steering force. As such, the power steering apparatus can perform steering operation with a small force and can select a steering gear ratio regardless of the operating force. In addition, the power steering device has an advantage that can be prevented from being transmitted to the handle to absorb the impact from the unevenness of the road surface.

최근에는 차속센서 및 조향 토크센서 등에서 감지한 차량의 운행조건에 따라 전자제어장치(ECU)에서 모터를 구동시켜 저속 운행 시에는 가볍고 편안한 조향감을 부여하고, 고속 운행 시에는 무거운 조향감과 더불어 양호한 방향 안정성을 부여하며, 비상상황에서는 급속한 조향이 이루어지도록 하여 운전자에게 최적의 조향 조건을 제공하는 전동식 스티어링장치를 이용하고 있는 추세이다.Recently, the electronic control unit (ECU) drives the motor according to the vehicle's driving conditions detected by the vehicle speed sensor and the steering torque sensor to give a light and comfortable steering feeling at low speeds, and a good steering stability at high speeds. In the emergency situation, it is a trend to use the electric steering device that provides the steering conditions to the driver by making a quick steering.

이러한 전동식 스티어링장치는 통상 전동펌프식 파워스티어링(EHPS: Electro-hydraulic Power Steering) 또는 전동식 파워스티어링(MDPS: Motor Driven Power Steering)이 있다. 이중 전동식 파워스티어링은 펌프에서 유압을 형성하여 파워를 어시스트(assist)하는 유압시스템과 달리 모터의 회전력으로 조향 파워를 어시스트(assist)하는 구조로서, 동력을 발생하는 모터와 연결된 웜축(Worm-Shaft)이 스티어링-샤프트(Steering-Shaft)와 연결되어 있는 웜휠(Worm Wheel)을 회전시켜 조향력을 어시스트(assist)하게 된다. 또한, 전동식 파워스티어링은 모터, 웜축 및 웜힐을 보호하기 위하여, 구성요소로 하우징(housing)을 포함하고, 하우징은 알루미늄 등의 금속으로 제조된다.Such electric steering apparatuses are typically electro-hydraulic power steering (EHPS) or motor driven power steering (MDPS). Dual electric power steering is a structure that assists steering power by the rotational power of a motor, unlike a hydraulic system that assists power by forming hydraulic pressure in a pump. A Worm-Shaft connected to a power generating motor is provided. The worm wheel, which is connected to the steering shaft, rotates to assist the steering force. In addition, the electric power steering includes a housing as a component to protect the motor, the worm shaft and the worm heel, and the housing is made of metal such as aluminum.

그러나, 종래의 전동식 파워스티어링은 하우징이 금속으로 제조되었기 때문에, 중량이 무겁고 제품 단가가 높아, 경량화와 비용절감에 문제가 발생한다.However, in the conventional electric power steering, since the housing is made of metal, the weight is heavy and the product cost is high, which causes problems in weight reduction and cost reduction.

상술한 종래기술의 문제점을 해결하기 위한 것으로, 본 발명의 목적은 경량화가 가능하고, 제품단가가 절감된 전동식 파워스티어링을 제조할 수 있는 전동식 파워스티어링용 하우징 조성물을 제공하는 것이다.In order to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a housing composition for electric power steering which can be reduced in weight, and can manufacture electric power steering with reduced product cost.

또한, 본 발명의 목적은 기계적 물성이 우수하고, 열과 수분에 의한 치수변형이 작은 전동식 파워스티어링용 하우징을 제공하는 것이다.It is also an object of the present invention to provide a housing for electric power steering having excellent mechanical properties and small dimensional deformation due to heat and moisture.

상기 목적을 달성하기 위하여, 본 발명은 조성물 총 중량에 있어서, 폴리부틸렌테레프탈레이트 수지 25 내지 90중량%; 아크릴로니트릴-스타이렌-아크릴레이트 5 내지 30중량%; 및 유리섬유 5 내지 50중량%를 포함하는 것을 특징으로 하는 전동식 파워스티어링용 하우징 조성물을 제공한다.In order to achieve the above object, the present invention in the total weight of the composition, 25 to 90% by weight of a polybutylene terephthalate resin; 5-30% by weight of acrylonitrile-styrene-acrylate; And it provides a housing composition for electric power steering comprising 5 to 50% by weight of glass fiber.

본 발명은 상기 전동식 파워스티어링용 하우징 조성물로 제조된 전동식 파워스티어링용 하우징을 제공한다.The present invention provides a housing for electric power steering made of the housing composition for electric power steering.

본 발명의 전동식 파워스티어링용 하우징 조성물로 제조된 전동식 파워스티어링용 하우징은 경량화가 가능하고, 제품단가가 절감되는 이점이 있다. 또한, 본 발명의 전동식 파워스티어링용 하우징 조성물로 제조된 전동식 파워스티어링용 하우징은 기계적 물성이 우수하고, 열과 수분에 의한 치수변형이 작은 이점이 있다.The electric power steering housing made of the electric power steering housing composition of the present invention has the advantage that the weight can be reduced and the product cost is reduced. In addition, the electric power steering housing made of the electric power steering housing composition of the present invention has the advantage of excellent mechanical properties and small dimensional deformation due to heat and moisture.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명의 전동식 파워스티어링용 하우징 조성물은 조성물 총 중량에 대하여, 폴리부틸렌테레프탈레이트 수지, 아크릴로니트릴-스타이렌-아크릴레이트 및 유리섬유를 포함한다.The housing composition for the electric power steering of the present invention comprises polybutylene terephthalate resin, acrylonitrile-styrene-acrylate and glass fiber, based on the total weight of the composition.

본 발명의 전동식 파워스티어링용 하우징 조성물에 포함되는 폴리부틸렌테레프탈레이트 수지는 본 발명의 조성물의 기본 골격을 이루는 수지이다. 상기 폴리부틸렌테레프탈레이트 수지는 조성물 총 중량에 대하여, 25 내지 90중량%로 포함되고, 바람직하게는 50 내지 80중량%로 포함된다. 상술한 범위를 만족하면, 본 발명의 조성물로 제조된 전동식 파워스티어링용 하우징이 우수한 기계적 물성을 갖게 한다.The polybutylene terephthalate resin contained in the housing composition for electric power steering of the present invention is a resin forming the basic skeleton of the composition of the present invention. The polybutylene terephthalate resin is included in 25 to 90% by weight, preferably 50 to 80% by weight based on the total weight of the composition. When the above-mentioned range is satisfied, the housing for the electric power steering made of the composition of the present invention has excellent mechanical properties.

본 발명의 전동식 파워스티어링용 하우징 조성물에 포함되는 아크릴로니트릴-스타이렌-아크릴레이트는 상기 폴리부틸렌테레프탈레이트의 열과 수분에 대한 치수안정성을 향상시키는 역할을 한다. 상기 아크릴로니트릴-스타이렌-아크릴레이트는 조성물 총 중량에 대하여, 5 내지 30중량%로 포함되고, 바람직하게는 10 내지 20중량%로 포함된다. 상기 아크릴로니트릴-스타이렌-아크릴레이트가 5중량% 미만으로 포함되면, 열과 수분에 대한 치수안정성의 향상을 기대하기 어렵고, 30중량%를 초과하여 포함되면, 본 발명의 조성물의 기계적 물성이 저하되어, 본 발명의 조성물로 제조된 전동식 파워스티어링용 하우징 작동시 신뢰성을 기대하기 어렵다. Acrylonitrile-styrene-acrylate included in the housing composition for electric power steering of the present invention serves to improve dimensional stability against heat and moisture of the polybutylene terephthalate. The acrylonitrile-styrene-acrylate is included in an amount of 5 to 30% by weight, preferably 10 to 20% by weight, based on the total weight of the composition. When the acrylonitrile-styrene-acrylate is included in less than 5% by weight, it is difficult to expect improvement in dimensional stability against heat and moisture, and when included in excess of 30% by weight, the mechanical properties of the composition of the present invention is lowered. Therefore, it is difficult to expect reliability when operating the housing for the electric power steering made of the composition of the present invention.

본 발명의 전동식 파워스티어링용 하우징 조성물에 포함되는 유리섬유는 상기 폴리부틸렌테레프탈레이트에 요구되는 기계적 물성을 강화시키는 역할을 한다. 상기 유리섬유는 조성물 총 중량에 대하여, 5 내지 50%로 포함되고, 바람직하게는 10 내지 30중량%로 포함된다. 상기 유리섬유가 5중량% 미만으로 사용되면, 전동식 파워스티어링 하우징에 적합한 기계적 물성이 발현되기 어려우며, 50중량%를 초과하여 포함되면, 탄성율과 같은 기계적 물성이 지나치게 높고 신율이 지나치게 낮아져, 작동 중 파손의 위험이 있다. 또한, 낮은 용융 흐름성에 의해 성형성이 저하되는 문제점도 발생한다.Glass fiber included in the electric power steering housing composition of the present invention serves to enhance the mechanical properties required for the polybutylene terephthalate. The glass fiber is included in 5 to 50%, preferably 10 to 30% by weight based on the total weight of the composition. When the glass fiber is used in less than 5% by weight, it is difficult to express the mechanical properties suitable for the electric power steering housing, when contained in more than 50% by weight, mechanical properties such as elastic modulus is too high and elongation is too low, breakage during operation There is a risk. In addition, a problem arises in that moldability is lowered due to low melt flowability.

본 발명의 전동식 파워스티어링용 하우징 조성물은 상기 구성요소 외에 첨가제를 더 포함할 수 있는데, 상기 첨가제는 성형시 유동성을 향상시키는 가소화제, 성형후 안정성을 부여하는 산화방지제 및 이들의 혼합물로 이루어진 군에서 선택되는 1종을 포함하는 것이 바람직하다. 상기 첨가제는 조성물 총 중량에 대하여, 0.1 내지 5중량%로 포함되는 것이 바람직하다.The housing composition for electric power steering of the present invention may further include an additive in addition to the above components, wherein the additive is a plasticizer for improving fluidity during molding, an antioxidant for imparting stability after molding, and a mixture thereof. It is preferable to include 1 type selected. The additive is preferably included in 0.1 to 5% by weight based on the total weight of the composition.

또한, 본 발명은 상술한 전동식 파워스티어링용 하우징 조성물로 제조된 전동식 파워스티어링용 하우징을 제공한다. 이러한 전동식 파워스티어링용 하우징은 경량화가 가능하고, 제품단가가 절감되는 이점이 있다. 더 구체적으로 설명하자면, 기존기술 대비 35% 이상의 경량화 효과를 기대할 수 있고, 현대자동차를 기준 으로 대당 390g까지 절감이 가능하다. 또한, 기존기술 대비 20% 이상의 원가를 절감할 수 있고, 현대자동차 기준으로 대당 단가 1,730원까지 절감이 가능하다. In addition, the present invention provides a housing for electric power steering made of the above-described electric power steering housing composition. The electric power steering housing can be light in weight, and there is an advantage in that the product cost is reduced. More specifically, the weight reduction effect can be expected to be more than 35% compared to the existing technology, and it is possible to save up to 390g per vehicle, based on Hyundai Motor. In addition, the company can reduce costs by more than 20% compared to existing technologies, and the unit price can be reduced to 1,730 won per unit based on Hyundai Motor Company.

또한, 본 발명의 전동식 파워스티어링용 하우징은 기계적 물성이 우수하고, 열과 수분에 의한 치수변형이 작은 이점이 있다.In addition, the electric power steering housing of the present invention has the advantage of excellent mechanical properties and small dimensional deformation due to heat and moisture.

이하에서, 실시예를 통하여 본 발명을 보다 상세히 설명한다. 그러나, 하기의 실시예는 본 발명을 더욱 구체적으로 설명하기 위한 것으로서, 본 발명의 범위가 하기의 실시예에 의하여 한정되는 것은 아니다. 하기의 실시예는 본 발명의 범위 내에서 당업자에 의해 적절히 수정, 변경될 수 있다.Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are intended to illustrate the present invention more specifically, but the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

실시예 1 내지 3, 비교예 1 내지 3: 전동식 파워스티어링용 하우징 조성물의 제조Examples 1 to 3, Comparative Examples 1 to 3: Preparation of Housing Composition for Electric Power Steering

하기 표 1에 나타낸 바와 같은 함량비에 따라 폴리부틸렌테레프탈레이트(PBT), 아크릴로니트릴-스타이렌-아크릴레이트(ASA), 폴리아마이드6(PA6), 유리섬유(GF) 등을 이축 압출기로 용융 혼련한 후 수지를 얻었다. 그 후, 사출성형을 통해 물성 측정을 위한 시편을 제작하였다. According to the content ratio as shown in Table 1, polybutylene terephthalate (PBT), acrylonitrile-styrene-acrylate (ASA), polyamide 6 (PA6), glass fiber (GF) and the like with a twin screw extruder The resin was obtained after melt kneading. Thereafter, specimens for measuring physical properties were prepared through injection molding.

구분division PBT(중량%)PBT (% by weight) ASA(중량%)ASA (wt%) PA6(중량%)PA6 (% by weight) GF(중량%)GF (% by weight) 실시예1Example 1 7070 1010 00 2020 실시예2Example 2 6060 1010 00 3030 실시예3Example 3 5050 2020 00 3030 비교예1Comparative Example 1 3030 4040 00 3030 비교예2Comparative Example 2 7070 00 00 3030 비교예3Comparative Example 3 00 00 7070 3030

시험예: 전동식 파워스티어링용 하우징의 특성평가Test Example: Evaluation of Characteristics of Housing for Electric Power Steering

실시예1 내지 실시예3, 비교예1 내지 비교예3으로 제조된 전동식 파워스티어링용 하우징의 인장강도, 인장탄성율, 충격강도, 열치수 변형, 수분치수변형을 측정하여 표 2에 나타내었다.Table 1 shows the tensile strength, tensile modulus, impact strength, thermal dimensional deformation, and moisture dimensional deformation of the housing for the electric power steering produced in Examples 1 to 3 and Comparative Examples 1 to 3.

<시험방법><Test method>

인장강도, 인장탄성율: ASTM D638Tensile Strength, Tensile Modulus: ASTM D638

충격강도: ASTM D256Impact Strength: ASTM D256

열치수변형, 수분치수변형: ASTM D1042Heat Strain, Moisture Strain: ASTM D1042

구분division 인장강도
(㎫)The tensile strength
(MPa) 인장탄성율(㎫)Tensile Modulus (MPa) 충격강도
(kJ/㎡)Impact strength
(kJ / ㎡) 열치수변형(%, ℃)Thermal dimension deformation (%, ℃) 수분치수변형
(%, 100%RH)Moisture dimension deformation
(%, 100% RH) 실시예1Example 1 120120 9,0009,000 99 0.60.6 00 실시예2Example 2 130130 9,9009,900 1010 0.50.5 00 실시예3Example 3 125125 9,7009,700 1010 0.50.5 00 비교예1Comparative Example 1 105105 8,2008,200 77 0.40.4 00 비교예2Comparative Example 2 135135 10,00010,000 1212 0.80.8 00 비교예3Comparative Example 3 125125 5,8005,800 1515 0.50.5 1.21.2

표 2에 나타난 바와 같이, 폴리부틸렌테레프탈레이트 및 아크릴로니트릴-스타이렌-아크릴레이트 수지를 실시예와 같이 첨가한 조성의 경우, 우수한 기계적 물성뿐만 아니라 열과 수분에 의한 치수변형이 작아서 전동식 파워 스티어링 하우징용 소재로 적합하다. 그러나 비교예1과 같이 아크릴로니트릴-스타이렌-아크릴레이트 수지의 첨가량이 지나치면 우수한 치수안정성에도 불구하고, 기계적 물성이 저하되는 문제점이 있다. 비교예2와 같이 아크릴로니트릴-스타이렌-아크릴레이트 수지가 첨가되지 않은 경우에는, 기계적 물성은 우수하나, 치수안정성 저하에 의한 제품변형의 문제점이 있다. 또한, 대표적인 구조재용 엔지니어링 플라스틱으로 널리 쓰이는 폴리아마이드6 수지를 적용한 경우, 비교예 3에서 제시한 바와 같이 수분에 의한 치수변형이 과다한 문제점이 있다.As shown in Table 2, in the case of the composition in which the polybutylene terephthalate and the acrylonitrile-styrene-acrylate resin were added as in the examples, the electric power steering was not only excellent in mechanical properties but also small in dimensional deformation due to heat and moisture. Suitable for housing materials. However, when the amount of the acrylonitrile-styrene-acrylate resin added is excessive as in Comparative Example 1, there is a problem that the mechanical properties are deteriorated despite the excellent dimensional stability. When acrylonitrile-styrene-acrylate resin is not added as in Comparative Example 2, the mechanical properties are excellent, but there is a problem of product deformation due to dimensional stability deterioration. In addition, when a polyamide 6 resin widely used as a representative engineering plastic for structural materials is applied, there is an excessive problem of dimensional deformation due to moisture, as shown in Comparative Example 3.

Claims (5)

조성물 총 중량에 있어서,In terms of the total weight of the composition, 폴리부틸렌테레프탈레이트 수지 25 내지 90중량%;25 to 90% by weight of polybutylene terephthalate resin; 아크릴로니트릴-스타이렌-아크릴레이트 5 내지 30중량%; 및5-30% by weight of acrylonitrile-styrene-acrylate; And 유리섬유 5 내지 50중량%를 포함하는 것을 특징으로 하는 전동식 파워스티어링용 하우징 조성물.Housing composition for electric power steering comprising 5 to 50% by weight of glass fibers. 청구항 1에 있어서,The method according to claim 1, 조성물 총 중량에 있어서,In terms of the total weight of the composition, 상기 폴리부틸렌테레프탈레이트 수지 50 내지 80중량%;50 to 80% by weight of the polybutylene terephthalate resin; 상기 아크릴로니트릴-스타이렌-아크릴레이트 10 내지 20중량%; 및10 to 20% by weight of the acrylonitrile-styrene-acrylate; And 상기 유리섬유 10 내지 30중량%를 포함하는 것을 특징으로 하는 전동식 파워스티어링용 하우징 조성물.Housing composition for electric power steering characterized in that it comprises 10 to 30% by weight of the glass fiber. 청구항 1에 있어서,The method according to claim 1, 상기 전동식 파워스티어링용 하우징 조성물은 가소화제, 산화방지제 및 이들의 혼합물로 이루어진 군에서 선택되는 1종을 첨가제로 더 포함하는 것을 특징으로 하는 전동식 파워스티어링용 하우징 조성물.The housing composition for electric power steering further comprises a plasticizer, an antioxidant, and a mixture selected from the group consisting of a mixture thereof as an additive. 청구항 1에 있어서,The method according to claim 1, 상기 첨가제는 조성물 총 중량에 대하여, 0.1 내지 5중량%로 포함되는 것을 특징으로 하는 전동식 파워스티어링용 하우징 조성물.The additive is a housing composition for electric power steering, characterized in that contained in 0.1 to 5% by weight based on the total weight of the composition. 청구항 1의 기재에 따른 전동식 파워스티어링용 하우징 조성물로 제조되는 것을 특징으로 하는 전동식 파워스티어링용 하우징.An electric power steering housing made of the electric power steering housing composition according to claim 1.
KR1020080113979A 2008-11-17 2008-11-17 A housing composition for motor driven power steering and a housing for motor driven power steering fabricated thereby KR20100055065A (en)

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