Abstract:
본 발명은 자동 변속기의 유성기어용 캐리어에 관한 것으로, 중앙의 내주면에 스플라인이 형성된 보스부와, 이 보스부와 함께 결합되어 피니언을 지지하게 되는 플랜지부로 이루어진 캐리어에 있어서, 상기 보스부에서 스플라인이 형성된 중앙부분을 제외한 나머지 부분이 원판형상으로 되어 있으면서 상기 플랜지부의 상면에는 다수개의 브릿지가 등간격으로 설치되어 있고, 상기 보스부의 하면이 상기 플랜지부의 브릿지 상부면에 브레이징 접합되어 서로 이웃하는 상기 브릿지 사이의 공간이 피니언 설치공간이 되도록 한 것에 그 특징이 있다. 이러한 본 발명의 유성기어용 캐리어 구조에서는 소결성형 및 브레이징 접합 적용시 종래의 컵형상 성형을 위한 딥 드로잉 및 보스부와 플랜지부의 결합을 위한 전자 빔 용접 등 값비싼 공정을 대체하여 원가 절감의 효과를 기대할 수 있으며, 용접부 구조 개선을 통해 기존 전자 빔 용접시의 변형 문제를 해소할 수 있는 장점이 있게 된다.
Abstract:
PURPOSE: A carrier for a planetary gear of an automatic transmission is provided to cut down the cost by alternating a deep drawing process for molding an existing cup shape and an electron beam welding process for combining a boss unit and a flange unit. CONSTITUTION: A carrier(100) for a planetary gear of an automatic transmission is composed of a boss unit(110) formed with a spline(112) on the center inner peripheral surface and a flange unit(120) combined together with the boss unit to support a pinion. The rest part of the boss unit except for the center portion at which the spline is formed is shaped like a disc. Plural bridges(124) are mounted on the upside of the flange unit at regular intervals. An underside of the boss unit is brazing-welded on the upside of the bridge of the flange unit to make a space between the bridges as a pinion mounting space.
Abstract:
PURPOSE: A wear resistant sintered alloy for valve seat is provided which improves wear resistance and formability by containing iron as a principal constituent, carbon, chromium, molybdenum, vanadium, tungsten, silicon, manganese and lead only without cobalt, and a manufacturing method thereof is provided. CONSTITUTION: The method comprises first process of press molding the blended alloy to a surface pressure of 5 to 8 tons/cm¬2 by blending a principal constituent of iron, 0.3 to 0.5 wt.% of carbon, 1.0 to 3.0 wt.% of chromium, 2.0 to 4.0 wt.% of molybdenum, 2.0 to 4.0 wt.% of vanadium, 5.0 to 7.0 wt.% of tungsten, 0.2 to 0.4 wt.% of sulfur, 0.2 to 0.5 wt.% of manganese and 10.0 to 15.0 wt.% of lead; second process of air cooling the sintered alloy after sintering the press molded alloy at a temperature of 1,140 to 1,180 deg.C after finishing the first process; third process of subzero cooling the air cooled sintered alloy to a temperature of -200 to -600 deg.C after finishing the second process; fourth process of impregnating the subzero cooled alloy with lead at a temperature of 450 to 550 deg.C after finishing the third process; and a process of manufacturing the wear resistant sintered alloy for valve seat by passing the lead impregnated alloy through barrel process at a temperature of 450 to 550 deg.C after finishing the fourth process.
Abstract:
PURPOSE: A wear resistant sintered alloy for valve seat is provided which improves wear resistance by containing iron as a principal constituent, carbon, chromium, molybdenum, vanadium, tungsten, cobalt, silicon and manganese and simultaneously performing copper infiltration and sintering treatment, and a manufacturing method thereof is provided. CONSTITUTION: The method comprises first process of press molding the blended alloy to a surface pressure of 5 to 8 tons/cm¬2 by blending a principal constituent of iron, 0.8 to 1.2 wt.% of carbon, 2.0 to 5.0 wt.% of chromium, 5.0 to 7.0 wt.% of molybdenum, 3.0 to 5.0 wt.% of vanadium, 8.0 to 12.0 wt.% of tungsten, 0.2 to 0.5 wt.% of manganese and 4.0 to 6.0 wt.% of cobalt; second process of air cooling the pure copper infiltrated and sintered alloy after infiltrating 20 to 30 wt.% of pure copper for the weight of the valve seat into the press molded alloy and sintering the pure copper infiltrated alloy at the same time at a temperature of 1,140 to 1,180 deg.C after finishing the first process; third process of rapidly cooling the heat treated alloy after heat treating the copper infiltrated and sintered alloy to a temperature of 1,130 to 1,180 deg.C after finishing the second process; fourth process of annealing the rapidly cooled alloy to a temperature of 600 to 700 deg.C after finishing the third process; and a process of proceeding some processing works on the annealed alloy at an ordinary temperature after finishing the fourth process.
Abstract:
PURPOSE: A powder alloy composition for spray coating is provided to improve wear resistance and corrosion resistance of cylinder block by mixing a matrix with rigid particles so that frictional and abrasion characteristics are given to the powder alloy composition, and a method for manufacturing cylinder block using the same is provided. CONSTITUTION: The powder alloy composition for spray coating is characterized in that it is prepared by mixing a matrix prepared by mixing pure iron having a powder particle size of 44 to 105 micrometers with stainless steel in a mixing ratio of 5:5 with rigid particles prepared by mixing Al2O3 with ZrO2 in a mixing ratio of 5:5 to 7:3 in a mixing ratio of 7:3 to 8:2. The method is characterized in that the cylinder block is manufactured by coating on the inner diameter of cylinder bore the powder alloy composition for spray coating prepared by mixing a matrix prepared by mixing pure iron having a powder particle size of 44 to 105 micrometers with stainless steel in a mixing ratio of 5:5 with rigid particles prepared by mixing Al2O3 with ZrO2 in a mixing ratio of 5:5 to 7:3 in a mixing ratio of 7:3 to 8:2 in a plasma type sprayer for spray coating vertically moved and rotationally moved, and wherein the plasma type sprayer for spray coating sprays argon gas at a high speed at a high temperature of 16,000 to 20,000 deg.C.
Abstract:
본 발명은 밸브 시이트의 제조방법에 관한 것으로서, 더욱 상세하게는 철을 주성분으로 하고 탄소, 니켈, 크롬, 몰리브덴, 코발트, 황 및 구리로 이루어진 밸브 시이트재에 스팀처리에 의한 산화피막을 형성시켜 고체윤활성을 부여한 밸브 시이트의 제조방법에 관한 것이다.
Abstract:
본고안은내연기관에적용되는마찰저감형태핏구조에관한것으로, 종래의심설치형태핏또는롤러장착형태핏(미국특허 4607599)이갖는문제점, 즉캠과태핏의결합각도를줄여면압을개선하고캠과접촉면의선접촉관계를향상시키며재질선정의자유도를높이고부품크기를줄여엔진콤팩트화에기여토록한 것이다. 본고안은심과태핏본체사이에박판의니들베어링을삽입하여캠의회전시심 및태핏본체가태핏의중심축을중심으로회전하여구름마찰과미끄럼마찰을동시에수행하도록한 것이다.
Abstract:
C 1.0-2.0중량%, Ni 2.0-4.0중량%, Cr 7.0-13.0중량%, Mo 0.3-0.8중량%, Co 1.5-4.5중량%, Nb 0.5-1.5중량%, V 0.2-0.8중량%, Cu 11.0-18.0중량%, W 1.0-2.0, 나머지는 Fe로 이루어진 소결합금 조성물은 내마모성, 내충격성, 열전도성이 우수하며, 생산원가 측면에서도 저렴하여 자동차 밸브시이트용 소재로서 유용하다.
Abstract:
PURPOSE: A wear resistant sintered alloy for valve seat is provided which improves wear resistance by containing iron as a principal constituent, carbon, chromium, molybdenum, vanadium, tungsten, cobalt, silicon and manganese and simultaneously performing copper infiltration and sintering treatment, and a manufacturing method thereof is provided. CONSTITUTION: The method comprises first process of press molding the blended alloy to a surface pressure of 5 to 8 tons/cm¬2 by blending a principal constituent of iron, 0.8 to 1.2 wt.% of carbon, 2.0 to 5.0 wt.% of chromium, 5.0 to 7.0 wt.% of molybdenum, 3.0 to 5.0 wt.% of vanadium, 8.0 to 12.0 wt.% of tungsten, 0.2 to 0.5 wt.% of manganese and 4.0 to 6.0 wt.% of cobalt; second process of air cooling the pure copper infiltrated and sintered alloy after infiltrating 20 to 30 wt.% of pure copper for the weight of the valve seat into the press molded alloy and sintering the pure copper infiltrated alloy at the same time at a temperature of 1,140 to 1,180 deg.C after finishing the first process; third process of rapidly cooling the heat treated alloy after heat treating the copper infiltrated and sintered alloy to a temperature of 1,130 to 1,180 deg.C after finishing the second process; fourth process of annealing the rapidly cooled alloy to a temperature of 600 to 700 deg.C after finishing the third process; and a process of proceeding some processing works on the annealed alloy at an ordinary temperature after finishing the fourth process.
Abstract:
PURPOSE: A powder alloy composition for spray coating is provided to improve wear resistance and corrosion resistance of cylinder block by mixing a matrix with rigid particles so that frictional and abrasion characteristics are given to the powder alloy composition, and a method for manufacturing cylinder block using the same is provided. CONSTITUTION: The powder alloy composition for spray coating is characterized in that it is prepared by mixing a matrix prepared by mixing pure iron having a powder particle size of 44 to 105 micrometers with stainless steel in a mixing ratio of 5:5 with rigid particles prepared by mixing Al2O3 with ZrO2 in a mixing ratio of 5:5 to 7:3 in a mixing ratio of 7:3 to 8:2. The method is characterized in that the cylinder block is manufactured by coating on the inner diameter of cylinder bore the powder alloy composition for spray coating prepared by mixing a matrix prepared by mixing pure iron having a powder particle size of 44 to 105 micrometers with stainless steel in a mixing ratio of 5:5 with rigid particles prepared by mixing Al2O3 with ZrO2 in a mixing ratio of 5:5 to 7:3 in a mixing ratio of 7:3 to 8:2 in a plasma type sprayer for spray coating vertically moved and rotationally moved, and wherein the plasma type sprayer for spray coating sprays argon gas at a high speed at a high temperature of 16,000 to 20,000 deg.C.