KR20060022830A - Reduction gear for use in an electrical power steering - Google Patents
Reduction gear for use in an electrical power steering Download PDFInfo
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- KR20060022830A KR20060022830A KR1020040071599A KR20040071599A KR20060022830A KR 20060022830 A KR20060022830 A KR 20060022830A KR 1020040071599 A KR1020040071599 A KR 1020040071599A KR 20040071599 A KR20040071599 A KR 20040071599A KR 20060022830 A KR20060022830 A KR 20060022830A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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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
- C08L27/00—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 a halogen; Compositions of derivatives of such polymers
- C08L27/02—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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—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 a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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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
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Abstract
본 발명은 전동식 파워 스티어링용 감속기어에 관한 것이다.The present invention relates to a reduction gear for electric power steering.
본 발명은, 내충격제로 EPDM을, 윤활제로 MoS2, Si오일 및 PTFE의 군으로부터 선택된 1종 이상을 함유하는 유리섬유 강화 나일론 재질로 이루어지는 것을 특징으로 한다.The present invention is made of a glass fiber reinforced nylon material containing EPDM as an impact agent and at least one selected from the group consisting of MoS 2 , Si oil and PTFE as a lubricant.
따라서, 우수한 마찰특성을 갖는 전동식 파워 스티어링용 감속기어가 제공되게 되므로, 전동식 파워 스티어링의 성능과 내구성을 향상시키는 효과가 있다.Therefore, since the reduction gear for electric power steering having excellent friction characteristics is provided, there is an effect of improving the performance and durability of the electric power steering.
Description
본 발명은 전동식 파워 스티어링용 감속기어에 관한 것으로서, 더욱 상세하게는 기계적 물성 특히 마찰특성이 우수하여 상대품을 마모시키지 않으면서 장시간 안정적으로 조합 사용될 수 있는 전동식 파워 스티어링용 감속기어에 관한 것이다.The present invention relates to a reduction gear for electric power steering, and more particularly, to a reduction gear for electric power steering that can be used stably for a long time without wear of the counterpart because of excellent mechanical properties, particularly friction characteristics.
일반적으로, 차량에 장착되는 파워 스티어링(power steering)은 저속주행시에는 가벼운 조향감을, 그리고 고속주행시에는 무거운 조향감을 운전자에게 부여하여 안전운행을 기하도록 하고, 최적의 조향조건이 제공되도록 한다.In general, a power steering mounted on a vehicle gives a driver a light steering feeling at low speeds and a heavy steering feeling at high speeds to ensure safe driving and provide optimal steering conditions.
이러한 파워 스티어링에는 전동모터에 의해 조향력이 조절되는 전동식 파워 스티어링(EPS ; Electrical Power Steering)이 있으며, 이것은 각종 센서에서 감지된 차량의 운행조건에 따라 제어부에서 전동모터를 정밀하게 구동하여 전동모터에서 발생한 토크가 감속기어를 거쳐서 스티어링 칼럼에 전달되어 스티어링 칼럼을 회동시키도록 함으로써, 스티어링 칼럼에 연결된 조향핸들을 조작하는 운전자의 핸들링을 돕게 된다.The power steering includes an electric power steering (EPS) whose steering force is controlled by the electric motor, which is precisely driven by the control unit according to the driving conditions of the vehicle detected by the various sensors. Torque is transmitted to the steering column via the reduction gear to rotate the steering column, thereby helping the driver to handle the steering wheel connected to the steering column.
이상과 같이, 전동식 파워 스티어링에는 감속기어가 사용되며, 감속기어는 전동모터의 회전수를 감속하여 스티어링 칼럼에 전달하는 역할을 하는 것으로, 상호 치합되는 한쌍의 기어로 구성되는데, 대개 플라스틱재질의 기어와 스틸재질의 기어 쌍으로 구성된다.As described above, a reduction gear is used for the electric power steering, and the reduction gear serves to reduce the number of revolutions of the electric motor and transmit it to the steering column, and is composed of a pair of gears that are meshed with each other. It consists of a pair of gears of material.
여기서, 플라스틱재질의 기어로는 나일론(nylon) 재질의 것이 주로 이용되며, 특히 나일론6이 이용된다.Here, the plastic gear is mainly used of nylon (nylon) material, in particular nylon 6 is used.
그러나, 나일론만으로는 강도, 내구성 및 내열성이 취약하므로 강화제를 첨가하게 되는데, 강화제로는 유리섬유(glass fiber), 탄소섬유(carbon fiber), 아라미드섬유(aramide fiber) 등이 이용될 수 있고, 이 중 가장 저렴하면서도 효과적인 유리섬유가 주로 이용되고 있다.However, nylon alone is weak in strength, durability and heat resistance, so the reinforcing agent is added, and as the reinforcing agent, glass fiber, carbon fiber, aramid fiber, and the like may be used. The cheapest and most effective glass fibers are mainly used.
그러나, 강화제의 첨가로 강도는 강해지나 그 대신 신율이 저하되어, 인성 저하로 취성을 나타내게 되므로, 외부 충격에 매우 취약하게 된다. 따라서, 내충격제를 또한 첨가하게 되며, 내충격제로는 엘라스토머(elastomer)의 일종인 EPDM(Ethylene Propylene Diene Therpolymers)이 주로 이용되고 있다.However, the strength is increased by the addition of the reinforcing agent, but instead, the elongation is lowered and the brittleness is exhibited due to the decrease in toughness, which makes it very vulnerable to external impact. Therefore, an impact resistant agent is added, and as the impact resistant agent, EPDM (Ethylene Propylene Diene Therpolymers), which is a kind of elastomer, is mainly used.
이상과 같이, 내충격제를 함유하는 유리섬유 강화 나일론 재질의 감속기어는 여러 우수한 기계적 물성을 나타내게 되나 보강된 유리섬유로 인해 스틸재질의 상대편 감속기어를 쉽게 마모시키는 문제점이 발생되게 된다.As described above, the reduction gear made of glass-fiber-reinforced nylon containing an impact resistant agent exhibits various excellent mechanical properties, but a problem of easily wearing the other side reduction gear of steel material occurs due to the reinforced glass fiber.
즉, 표면에 유리섬유가 돌출되어 돌출된 유리섬유에 의해 상대품의 마모가 쉽게 발생되어, 결국 기어 맞물림에서 유격이 발생되게 됨으로써 지속적이고 안정적인 접촉운동이 불가능하게 된다. That is, the wear of the counterpart is easily generated by the glass fiber protruding from the glass fiber protruding on the surface, so that the play occurs in the gear meshing, and thus continuous and stable contact motion is impossible.
따라서, 종래에는 이를 방지하기 위해 스틸기어에 윤활제인 MoS2(이황화몰리부덴)를 코팅하거나 그리스+MoS2를 도포하여 사용하고 있는데, 코팅하는 경우에는 그 제조비용이 높은 문제점이 있었다.Therefore, conventionally, in order to prevent this, the coating of MoS 2 (molybdenum disulfide), which is a lubricant, or grease + MoS 2 is applied to the steel gear, but there is a problem in that the manufacturing cost is high.
본 발명은 상기와 같은 제반 사항을 감안하여 창안된 것으로서, 여러 기계적 물성이 우수하면서도 마찰특성도 우수하여 상대품인 스틸기어를 마모시키지 않고 오랜 기간 안정적으로 조합 사용될 수 있는 플라스틱 재질의 전동식 파워 스티어링용 감속기어를 제공하는데 그 목적이 있다.The present invention was devised in consideration of the above-mentioned matters, and has excellent mechanical properties and excellent frictional properties, and is used for electric power steering of plastic material that can be stably combined for a long time without abrasion of relative steel gear. The purpose is to provide a reduction gear.
상술한 목적을 달성하기 위한 본 발명은, 내충격제로 EPDM을, 윤활제로 MoS2, Si오일 및 PTFE의 군으로부터 선택된 1종 이상을 함유하는 유리섬유 강화 나일론 재질로 이루어지는 전동식 파워 스티어링용 감속기어를 제공한다.The present invention for achieving the above object, there is provided a reduction gear for electric power steering made of glass fiber reinforced nylon material containing at least one selected from the group of EPDM as the impact agent, MoS 2 , Si oil and PTFE as a lubricant. do.
본 발명의 상기 목적과 여러가지 장점은 이 기술분야에 숙련된 사람들에 의해 첨부된 도면을 참조하여 아래에 기술되는 발명의 바람직한 실시예로부터 더욱 명확하게 될 것이다.The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.
이하, 첨부된 도면을 참조로 본 발명의 바람직한 실시예를 상세히 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명에 따르면, 전동식 파워 스티어링용 감속기어의 소재로 원소재인 나일론(특히, 나일론6)에 강화제로 유리섬유를, 내충격제로 EPDM을 첨가함과 더불어 그 마찰특성의 향상을 위해 윤활제를 첨가하게 된다.According to the present invention, as a material of the electric power steering reduction gear, glass fiber is added as a reinforcing agent to nylon (especially nylon 6), which is a raw material, and EPDM is added as an impact agent, and a lubricant may be added to improve the friction characteristics. do.
윤활제로는 MoS2, Si오일, PTFE(Poly Tetra Fluor Ethylene)의 이용이 고려될 수 있으며, 윤활제의 첨가에 따라 경도, 인장강도 및 신율 등은 저하되게 되므로 그 종류 및 첨가량을 적절히 제한할 필요가 있다.As lubricant, MoS 2 , Si oil, and Poly Tetra Fluor Ethylene (PTFE) may be considered, and hardness, tensile strength, and elongation may be lowered according to the addition of lubricant, so the type and amount of addition need to be appropriately limited. have.
따라서, 하기의 표 1과 같은 조성으로 다수의 시험시편을 제조하여 여러 기계적 물성을 시험 평가하였다.Therefore, a number of test specimens were prepared with the composition shown in Table 1 below to evaluate the various mechanical properties.
여기서, 유리섬유로는 길이 3~4㎜, 직경 10㎛의 단섬유(short fiber)를 사용하였으며, EPDM으로는 융점 60℃, Tg(유리전이온도) -60℃의 MAH-g-EPDM(무수말레인산 그레프트 EPDM)을 사용하였고, MoS2로는 입경 4㎛ 정도의 미세 파우더형태를 사용하였으며, PTFE로는 입경 40~50㎛의 미세 파우더형태를 사용하였고, Si오일로는 평균분자량 1,200의 액상 오일을 사용하였다.Here, short fibers of 3 to 4 mm in length and 10 μm in diameter were used as glass fibers, and MAH-g-EPDM (anhydrous) with melting point of 60 ° C. and Tg (glass transition temperature) of -60 ° C. was used as EPDM. Maleic acid grafted EPDM), MoS 2 was used as a fine powder with a particle size of about 4㎛, PTFE was used as a fine powder with a particle size of 40-50㎛, and Si oil was used as a liquid oil with an average molecular weight of 1,200. Used.
이상과 같은 시험시편들에 대하여 여러 기계적 물성을 측정한 결과를 하기 표 2에 나타낸다.The results of measuring various mechanical properties of the test specimens described above are shown in Table 2 below.
시험결과를 살펴 보면, 윤활제로 MoS2, Si오일, PTFE의 첨가에 따라 경도 및 인장강도는 저하되나 그 저하 대비 신율의 증가 효과가 더욱 크게 나타났으며, 특히 MoS2와 Si오일을 함께 첨가한 6번 소재에서 신율의 증가폭이 컸다.The test results showed that the hardness and tensile strength decreased with addition of MoS 2 , Si oil, and PTFE as lubricants, but the elongation was increased more than that, especially MoS 2 and Si oil. The increase in elongation at material 6 was significant.
그리고, 윤활제를 첨가한 다른 경우들에 비해 MoS2와 Si오일을 함께 첨가한 경우에서 상대적으로 경도와 인장강도도 양호하게 측정되었다.In addition, hardness and tensile strength were relatively good in the case where MoS 2 and Si oil were added together, compared to other cases in which lubricant was added.
나아가, 윤활제의 첨가에 따라 마찰력은 전반적으로 크게 향상되었으며, 특히 Si오일 또는 MoS2/Si오일을 첨가한 소재에서 대폭 향상되었다.Further, the frictional force was greatly improved with the addition of the lubricant, especially in the material added with Si oil or MoS 2 / Si oil.
기어 치강도의 시험결과는 인장강도의 결과와 유사한 경향을 나타내었으며, 이 시험에서도 MoS2와 Si오일을 함께 첨가한 소재에서 우수한 결과가 나타났다.The test results of gear stiffness showed a similar tendency to that of tensile strength, and in this test, excellent results were obtained for the material added with MoS 2 and Si oil.
그리고, 기어 내구성 시험에서도 MoS2와 Si오일을 함께 첨가한 소재가 상대적으로 우수한 결과를 나타내었다.In addition, in the gear durability test, a material in which MoS 2 and Si oil were added together showed a relatively good result.
이상과 같은 결과로 미루어, 윤활제로 MoS2와 Si오일을 함께 함유하는 소재가 가장 우수한 기계적 물성을 나타내 감속기어의 재질로 가장 적합하다는 결론이 도출될 수 있다. As a result, it can be concluded that the material containing MoS 2 and Si oil together as the lubricant shows the best mechanical properties and is the most suitable material for the reduction gear.
덧붙여, MoS2와 Si오일을 함께 함유하는 소재의 경우 그 인장강도-변위곡선에서 통상적인 유리섬유 강화소재의 인장곡선 패턴과는 다르게 항복점이 소재의 파단변위 끝에서 나타났는데, 이것은 외부응력에 대한 회복력이 매우 우수하다는 것을 의미하며, 첨가된 MoS2 입자와 Si오일이 나일론 분자 사이에서 상호 연결되어 MoS2는 강도를, Si는 신율을 강화시켜 시너지효과를 일으킨 것으로 보여지며, 이에 따라 장기적인 외부응력에 견딜 수 있는 내구성도 우수하게 나타나는 것으로 판단된다.In addition, the tensile strength-displacement curve of MoS 2 and Si oil together showed that the yield point appeared at the end of the break displacement of the material, unlike the tensile curve pattern of conventional glass fiber reinforced materials. It means that the resilience is very good, and the added MoS 2 particles and Si oil are interconnected between the nylon molecules, resulting in the synergy effect by the MoS 2 strength and the Si strengthening elongation. The durability to withstand is also excellent.
이상, 상기 내용은 본 발명의 바람직한 일 실시예를 단지 예시한 것으로 본 발명의 당업자는 본 발명의 요지를 변경시킴이 없이 본 발명에 대한 수정과 변경을 가할 수 있음을 인지해야 한다.In the foregoing description, it should be understood that those skilled in the art can make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.
본 발명에 따르면, 우수한 마찰특성을 갖는 전동식 파워 스티어링용 감속기어가 제공되게 되므로, 전동식 파워 스티어링의 성능과 내구성을 향상시키는 효과가 있다.According to the present invention, since the reduction gear for electric power steering having excellent friction characteristics is provided, there is an effect of improving the performance and durability of the electric power steering.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040071599A KR100986242B1 (en) | 2004-09-08 | 2004-09-08 | Reduction gear for use in an electrical power steering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040071599A KR100986242B1 (en) | 2004-09-08 | 2004-09-08 | Reduction gear for use in an electrical power steering |
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| Publication Number | Publication Date |
|---|---|
| KR20060022830A true KR20060022830A (en) | 2006-03-13 |
| KR100986242B1 KR100986242B1 (en) | 2010-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020040071599A KR100986242B1 (en) | 2004-09-08 | 2004-09-08 | Reduction gear for use in an electrical power steering |
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| Country | Link |
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| KR (1) | KR100986242B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516759A (en) * | 2011-11-23 | 2012-06-27 | 安徽宜万丰电器有限公司 | Gear and manufacturing method thereof |
| CN104479347A (en) * | 2014-12-08 | 2015-04-01 | 苏州新区佳合塑胶有限公司 | Plastic material for stationery shells |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100601756B1 (en) | 2000-05-04 | 2006-07-14 | 주식회사 코오롱 | Polyamide resin composition |
| KR100387850B1 (en) | 2000-12-29 | 2003-06-18 | 현대자동차주식회사 | Polyamide resin composition and synthetic resin product |
| KR100858750B1 (en) | 2002-04-01 | 2008-09-16 | 주식회사 코오롱 | Glass fiber reinforced polyamide resin composition with excellent wear resistance |
-
2004
- 2004-09-08 KR KR1020040071599A patent/KR100986242B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516759A (en) * | 2011-11-23 | 2012-06-27 | 安徽宜万丰电器有限公司 | Gear and manufacturing method thereof |
| CN104479347A (en) * | 2014-12-08 | 2015-04-01 | 苏州新区佳合塑胶有限公司 | Plastic material for stationery shells |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100986242B1 (en) | 2010-10-07 |
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