KR950009321B1 - Rocker arm tip for automotive engine - Google Patents
Rocker arm tip for automotive engine Download PDFInfo
- Publication number
- KR950009321B1 KR950009321B1 KR1019910009307A KR910009307A KR950009321B1 KR 950009321 B1 KR950009321 B1 KR 950009321B1 KR 1019910009307 A KR1019910009307 A KR 1019910009307A KR 910009307 A KR910009307 A KR 910009307A KR 950009321 B1 KR950009321 B1 KR 950009321B1
- Authority
- KR
- South Korea
- Prior art keywords
- rocker arm
- arm tip
- coating layer
- powder
- ceramic coating
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/08—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of metallic material
Abstract
Description
제1도는 자동차 엔진의 로커암의 부분 단면도.1 is a partial cross-sectional view of a rocker arm of an automobile engine.
제2도는 자동차 엔진의 로커암에 작용되는 로커암 팁의 사시도.2 is a perspective view of a rocker arm tip acting on the rocker arm of an automobile engine.
제3도는 종래 로커암 팁의 단면도.3 is a cross-sectional view of a conventional rocker arm tip.
제4도는 본 발명에 따른 로커암 팁의 단면도이다.4 is a cross-sectional view of the rocker arm tip according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 로커암(ROCKER ARM) 12 : 로커암 몸체(ROCKER ARM BODY)10: rocker arm 12: rocker arm body (ROCKER ARM BODY)
14 : 로커암 축(ROCKER ARM SHAFT) 16 : 밸브축14: ROCKER ARM SHAFT 16: Valve Shaft
18 : 로커암 팁(ROCKER ARM TIP) 20 : 몸체부18: rocker arm tip (ROCKER ARM TIP) 20: body
22 : 미끄럼부 24 : 미끄럼면22: sliding part 24: sliding surface
26 : 캠 28 : 세라믹 코팅층26 cam 28 ceramic coating layer
30 : 결합코팅층 32 : 알루미늄 소결합금30: bonding coating layer 32: aluminum small alloy
본 발명은 자동차 엔진의 로커암 팁(ROCKER ARM TIP)에 관한 것으로, 더욱 상세하게는 캠과 접촉되는 미끄럼부의 미끄럼면에 형성된 세라믹 코팅층의 박리현상을 방지하고, 내마모성을 향상시킨 자동차 엔진의 로커암 팁에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm tip of an automotive engine, and more particularly, to a rocker arm of an automotive engine which prevents peeling of the ceramic coating layer formed on the sliding surface of a sliding portion in contact with a cam and improves wear resistance. The tip is about.
일반적으로, 로커암은 자동차의 엔진 상부에 설치되어 엔진의 구동에 따른 캠의 회전운동에 의해 연동되면서 엔진의 흡입밸브 또는 배기밸브를 개폐시키는 작용을 하는 것이다. 이와 같은 자동차 엔진의 로커암(10)은 제1도에 도시된 바와 같이 로커암 몸체(12)가 로커암 축(ROCKER ARM SHAFT, 14)에 의해 회동 가능하게 설치되고, 상기 로커암 몸체(12)의 일측끝은 엔진의 흡입밸브 또는 배기밸브의 밸브축(16)에 접촉되고, 다른쪽 끝은 엔진에 의해 구동되는 캠(26)과 접촉되면서 상호 연동되는 구조로 이루어져 있는바, 상기한 자동차 엔진의 로커암(10)에서 로커암 몸체(12)의 일측면에는 제2도에 도시된 바와 같이 로커암 몸체(12)에 삽입되는 몸체부(20)와 외부로 돌출되어 캡(26)과 접촉되는 미끄럼부(22)로 이루어지는 로커암 팁(18)이 돌설된 구조로 이루어진다.In general, the rocker arm is installed on the upper engine of the vehicle and acts to open and close the intake valve or the exhaust valve of the engine while being linked by the rotational movement of the cam according to the driving of the engine. As shown in FIG. 1, the rocker arm 10 of the automobile engine is installed such that the rocker arm body 12 is rotatably installed by the rocker arm shaft 14, and the rocker arm body 12 is rotated. One end of the) is in contact with the valve shaft 16 of the intake valve or exhaust valve of the engine, the other end is in contact with the cam 26 driven by the engine is made of a structure that interlocks with each other, In the rocker arm 10 of the engine, one side of the rocker arm body 12 protrudes outward from the body portion 20 inserted into the rocker arm body 12 as shown in FIG. The rocker arm tip 18 which consists of the sliding part 22 which contacts is formed in the structure which protrudes.
이와 같은 로커암 팁(18)은 제3도에 도시된 바와 같이 전체의 재질은 알루미늄 소결합금(32)으로 이루어지되, 캠(26)과 접촉되는 미끄럼부(22) 외부표면의 미끄럼면(24)에는 내마모성을 부여하고 로커암(10)의 밸브개폐 작동의 확실성을 보장하기 위하여 질화물계인 Si3N4의 세라믹 코팅층(28)이 형성되는데, 미끄럼면(24)상에 단순히 세라믹 코팅층(28)만이 형성되 구조로 이루어지기 때문에 작동시 알루미늄 소결합금(32)과 세라믹 코팅층(28)의 열팽창계수차에 따라 세라믹 코팅층(28)이 박리된다는 결점이 있었고, 이와 같은 세라믹 코팅층(28)의 박리현상에 따라 캠(26)의 구동력에 따라 연동되는 로커암(10)의 작동시 불안정하여 흡입 또는 배기밸브의 개폐동작이 정확히 이루어지지 않는다는 문제점이 제기되었다.As shown in FIG. 3, the rocker arm tip 18 is made of aluminum sintered alloy 32, and the sliding surface 24 of the outer surface of the sliding portion 22 in contact with the cam 26 is shown. In order to provide abrasion resistance and to ensure the valve opening and closing operation of the rocker arm 10, a ceramic coating layer 28 of nitride Si 3 N 4 is formed, and the ceramic coating layer 28 is simply formed on the sliding surface 24. Since only a formed structure is formed, the ceramic coating layer 28 is peeled off according to the thermal expansion coefficient difference between the aluminum small alloy 32 and the ceramic coating layer 28 during operation. Accordingly, there is a problem that the opening and closing operations of the intake or exhaust valves are not precisely performed due to instability during the operation of the rocker arm 10 interlocked according to the driving force of the cam 26.
본 발명은 이와 같은 종래의 문제점들을 해결하기 위한 것으로, 로커암 팁에 있어서 미끄럼부 외면의 미끄럼면에 형성된 산화물계 세라믹 코팅층과 알루미늄 소결합금 사이에 결합코팅(BOND COATING)층을 형성시켜 알루미늄 소결합금과 세라믹 코팅층 사이의 열팽창 계수차를 보완하므로서 상기 미끄럼면으로부터 세라믹 코팅층이 박리되는 것을 방지하고 내마모성을 향상시킨 자동차 엔진의 로커암 팁을 제공하고자 하는데 목적이 있다.The present invention is to solve such a conventional problem, the aluminum sintered alloy by forming a bond coating (BOND COATING) layer between the oxide-based ceramic coating layer formed on the sliding surface of the outer surface of the sliding portion and the aluminum sintered alloy in the rocker arm tip The purpose of the present invention is to provide a rocker arm tip of an automobile engine that prevents the ceramic coating layer from peeling off the sliding surface and improves the wear resistance by compensating the thermal expansion coefficient difference between the ceramic coating layer and the ceramic coating layer.
이하, 첨부된 도면에 의하여 본 발명을 보다 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
본 발명은 캠과 접촉하는 미끄럼부와 로커암 몸체에 삽입되는 몸체부로 이루어지는 자동차 엔진의 로커암 팁에 있어서, 상기 미끄럼부 외면에 미끄럼면에 형성된 세라믹 코팅층과 알루미늄 소결합금 사이에 니켈(Ni)분말, 크롬(Cr)분말, 알루미늄(Al)분말 및 이트륨(Y)분말의 혼합분말로 이루어진 결합코팅층을 형성시켜 된 것을 특징으로 한다.The present invention relates to a rocker arm tip of an automobile engine including a sliding portion contacting a cam and a body portion inserted into a rocker arm body, wherein a nickel powder is disposed between a ceramic coating layer formed on a sliding surface on an outer surface of the sliding portion and an aluminum sintered alloy. And a bonding coating layer made of a mixed powder of chromium (Cr) powder, aluminum (Al) powder and yttrium (Y) powder.
이와 같은 본 발명에 따른 자동차 엔진의 로커암 팁(18)은 제4도에 도시된 바와 같이 엔진에 의해 회전 구동되는 캠(26)과 접촉되는 미끄럼부(22) 외표면의 미끄럼면(24)에 0.5∼1.5㎜의 두께로 형성된 산화물계 세라믹 코팅층(28)과 상기 로커암 팁(18) 전체를 이루는 알루미늄 소결합금(32) 사이에 니켈분말, 크롬분말, 알루미늄분말 및 이트륨분말의 혼합분말을 이용한 결합코팅층(30)을 0.5∼1㎜ 두께로 형성시킨 구조로 이루어진다.The rocker arm tip 18 of the automobile engine according to the present invention has a sliding surface 24 on the outer surface of the sliding portion 22 which is in contact with the cam 26 which is rotationally driven by the engine as shown in FIG. Mixed powder of nickel powder, chromium powder, aluminum powder and yttrium powder between the oxide ceramic coating layer 28 formed in the thickness of 0.5 to 1.5 mm and the aluminum base alloy 32 forming the rocker arm tip 18. It consists of a structure in which the used bonding coating layer 30 is formed to a thickness of 0.5 ~ 1mm.
한편, 상기와 같은 로커암 팁(18)의 제조는 다음과 같은 공정에 따라 이루어진다.On the other hand, the manufacture of the rocker arm tip 18 as described above is made according to the following process.
즉, 알루미늄 소결합금을 모재로 하여 제2도에 도시된 바와 같이 미끄럼부(22)와 몸체부(20)로 구성되는 로커암 팁(18)을 가공하는 모재가공공정과, 미끄럼부(22)의 미끄럼면(24)에 존재하는 불순물을 제거하고 불라스팅(BLASTING) 처리하는 모재 전처리공정과, 상기의 전처리공정을 거친 모재를 100∼200℃의 온도로 예열하는 모재 예열공정과, 상기와 같이 100∼200℃의 온도로 예열된 미끄럼부(22)의 미끄럼면(24)상에 니켈, 크롬, 알루미늄 및 이트륨의 혼합분말을 건조한 조건에서 플라즈마(PLASMA)용사법으로 코팅하여 0.5∼1㎜ 두께의 결합코팅층(30)을 형성하는 공정과, 상기한 결합코팅층(30) 상에 Al2O350∼70wt%와, TiO230∼50wt%로 이루어지는 산화물계 세라믹을 상기와 같은 플라즈마용사법으로 0.5∼1.5㎜ 두께로 코팅하여 세라믹 코팅층(28)을 형성하는 공정 및 상기와 같이 형성된 코팅층을 연마하는 공정을 순차적으로 시행하여 본 발명의 자동차 엔진의 로커암 팁을 제조한다.That is, a base material processing step of processing the rocker arm tip 18 composed of the sliding portion 22 and the body portion 20 as shown in FIG. 2 using the aluminum base alloy as the base material, and the sliding portion 22. A base material pretreatment step of removing impurities present on the sliding surface 24 and blasting, and a preheating step of preheating the base material which has undergone the pretreatment step at a temperature of 100 to 200 ° C., as described above. Nickel, chromium, aluminum and yttrium mixed powder was coated on the sliding surface 24 of the sliding portion 22 preheated to a temperature of 100 to 200 ° C. under a dry condition by plasma spraying to be 0.5 to 1 mm thick. The process of forming the bonding coating layer 30, and the oxide-based ceramic consisting of 50 to 70wt% of Al 2 O 3 and 30 to 50wt% of TiO 2 on the bonding coating layer 30 by the plasma spray method as described above. Process and phase to form a ceramic coating layer 28 by coating 1.5mm thick The rocker arm tip of the automobile engine of the present invention is manufactured by sequentially performing a process of polishing the coating layer formed as described above.
이와 같이 제조된 본 발명에 따른 자동차 엔진의 로커암 팁을 사용하는 경우 세라믹 코팅층과 알루미늄 소결합금의 모재 사이에 형성된 결합코팅층의 역할에 의해 상기 세라믹 코팅층과 알루미늄 소결합금 모재 사이이 열팽창계수차를 줄여주므로써, 미끄럼면으로부터 세라믹 코팅층이 박리되는 것이 방지됨과 동시에 내마모성이 증대된다는 효과가 있고, 이에따라 캠의 회전 구동에 따른 로커암의 동작이 흡입밸브 또는 배기 밸브에 정확히 전달되므로 제품에 대한 신뢰도를 제고시킬 수 있다는 효과가 있다.In the case of using the rocker arm tip of the automobile engine according to the present invention manufactured as described above, the coefficient of thermal expansion is reduced between the ceramic coating layer and the aluminum base alloy base material by the role of a bonding coating layer formed between the ceramic coating layer and the base material of the aluminum base alloy. Therefore, the ceramic coating layer is prevented from being delaminated from the sliding surface, and wear resistance is increased. Accordingly, the rocker arm is accurately transmitted to the intake valve or the exhaust valve according to the rotational drive of the cam, thereby improving reliability of the product. It can be effective.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910009307A KR950009321B1 (en) | 1991-06-05 | 1991-06-05 | Rocker arm tip for automotive engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910009307A KR950009321B1 (en) | 1991-06-05 | 1991-06-05 | Rocker arm tip for automotive engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930000709A KR930000709A (en) | 1993-01-15 |
| KR950009321B1 true KR950009321B1 (en) | 1995-08-19 |
Family
ID=19315451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019910009307A KR950009321B1 (en) | 1991-06-05 | 1991-06-05 | Rocker arm tip for automotive engine |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR950009321B1 (en) |
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1991
- 1991-06-05 KR KR1019910009307A patent/KR950009321B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR930000709A (en) | 1993-01-15 |
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