KR100580703B1 - Pistion structure to improve durability - Google Patents

Pistion structure to improve durability Download PDF

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Publication number
KR100580703B1
KR100580703B1 KR1019990055300A KR19990055300A KR100580703B1 KR 100580703 B1 KR100580703 B1 KR 100580703B1 KR 1019990055300 A KR1019990055300 A KR 1019990055300A KR 19990055300 A KR19990055300 A KR 19990055300A KR 100580703 B1 KR100580703 B1 KR 100580703B1
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South Korea
Prior art keywords
piston
steel strip
present
pistion
reduce
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KR1019990055300A
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Korean (ko)
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KR20010054471A (en
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서진관
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
    • F16J1/006—Pistons; Trunk pistons; Plungers obtained by assembling several pieces of different materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/01—Pistons; Trunk pistons; Plungers characterised by the use of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

발명의 목적은 크기와 무게가 감소되고 굽힘 강성을 증대시켜 크랙발생을 감소시킬 수 있는 구조의 피스톤을 제공하는데 있다. It is an object of the present invention to provide a piston of a structure that can reduce the size and weight and increase the bending stiffness to reduce cracking.

이를위해 본 발명은 피스톤 상면과 랜드부 및 피스톤 핀 보스부가 형성되는 스컷부를 포함하는 알루미늄 합금제 피스톤에 있어서, 상기 피스톤 상면 하부의 몸체내에는 판상의 강재스트립이 주조시 매설된 것을 특징으로 한다.To this end, the present invention is characterized in that the piston of the aluminum alloy including the upper portion of the piston and the cut portion formed with the land portion and the piston pin boss portion, characterized in that the plate-like steel strip is embedded in the body of the lower piston upper surface during casting.

강재스트립, 피스톤, 굽힘강성, 크랙Steel strip, piston, bending stiffness, crack

Description

내구력 향상을 위한 개선된 구조의 피스톤{Pistion structure to improve durability}Piston structure to improve durability

도 1은 본 발명의 강재스트립을 나타내는 사시도1 is a perspective view showing a steel strip of the present invention

도 2는 본 발명에 의한 내구력 향상을 위한 개선된 구조의 피스톤을2 is a piston of an improved structure for improving durability according to the present invention;

나타내는 정단면도       Forward cross section

도 3은 종래의 피스톤 구조를 나타내는 도면3 is a view showing a conventional piston structure

※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing

1 : 피스톤 2 : 상면1: piston 2: upper surface

3 : 연소실 6 : 스컷부3: combustion chamber 6: cut part

7 : 피스톤 핀 보스부 8 : 강재스트립7: piston pin boss portion 8: steel strip

본 발명은 내구력 향상을 위한 피스톤의 구조개선에 관한 것이다.The present invention relates to a structural improvement of a piston for improving durability.

피스톤은 실린더내를 왕복 운동하는 동안 팽창행정에서 고온·고압의 가스압력을 받아 이것을 커넥팅로드를 거쳐 크랭크 축에 회전력을 주는 기구로서, 도 3에 도시하는 것과 같이 피스톤링이 삽입되는 복수개의 링그루우브(20), 랜드부(21) 및 하부의 스컷부(22)와 피스톤 핀이 끼워져 계합되는 핀부스부(23)를 주요구성으로 하고 있다.The piston is a mechanism that receives high and high pressure gas pressure in the expansion stroke during the reciprocating motion in the cylinder and gives it a rotational force to the crankshaft through the connecting rod, and a plurality of ring grooves into which the piston ring is inserted as shown in FIG. The main structure is the woofer 20, the land part 21, and the pin part 23 by which the cut part 22 of the lower part and the piston pin are fitted and engaged.

연소실에서의 가스 폭발시 피스톤 상면(24)에는 축방향의 폭발력(Fg)을 받게되며, 이 폭발력(Fg)에 의해 피스톤(25)이 하강 운동하게 된다.When the gas is exploded in the combustion chamber, the piston upper surface 24 receives an explosive force Fg in the axial direction, and the piston 25 moves downward by the explosive force Fg.

그런데 최근의 차량 엔진의 경우 고출력, 저연비화에 따라 최대가스 폭발압력(Fg)이 증가하는 추세이어서 구조적으로 더욱 튼튼한 피스톤(25)이 요구되고 있다.However, in recent years, the maximum engine explosion pressure (Fg) increases with high power and low fuel consumption in vehicle engines, and thus, a more durable piston 25 is required.

폭발력 Fg가 피스톤(25)에 작용하면 그 힘은 피스톤 핀 보스부(23)에 끼워져 계합된 피스톤 핀(도시생략)에 가해지며, 이로부터 반력 FR이 작용하게 된다.When the explosive force Fg acts on the piston 25, the force is applied to the piston pin (not shown) engaged with the piston pin boss portion 23, whereby the reaction force F R acts.

이와같이 Fg와 반력 FR이 교대로 작용 및 해제를 반복하면 피스톤 핀 보스부(23) 상단 모서리부(26)의 크랙 발생 가능성이 커지게 되며, 피스톤에 크랙이 발생하면 엔진이 손상되고 큰 사고를 유발하게 되므로 이에 대한 대책으로 압축높이(B)를 크게 하고 있다.As described above, when Fg and reaction force F R alternately act on and release, the possibility of cracking in the upper edge portion 26 of the piston pin boss 23 increases. As a countermeasure against this, the compression height B is increased.

그러나 상기와 같이 압축높이(B)를 증가시켜 압축력 작용에 의한 크랙발생을 감소시키는 방안은 그 유효성에도 불구하고 피스톤의 무게를 증가시키고 펌핑로스(압축손실) 증대의 원인이 되므로써 엔진출력 저하의 원인이 되고 있다.However, the method of reducing the occurrence of cracking by the action of the compression force by increasing the compression height (B) as described above causes the increase in the weight of the piston and causes the pumping loss (compression loss) to increase, causing the engine output to fall. It is becoming.

이에 본 발명은 상기한 문제점을 감안하여 제안한 것으로서 그의 목적으로 하는 것은 Therefore, the present invention has been proposed in view of the above problems, and its object is to                         

크기와 무게가 감소되고 굽힘 강성을 증대시켜 크랙발생을 감소시킬 수 있는 구조의 피스톤을 제공하는데 있다.It is to provide a piston of a structure that can reduce the size and weight and increase the bending stiffness to reduce the occurrence of cracks.

상기한 목적을 달성하기 위하여 본 발명의 피스톤은 피스톤 상면과 랜드부 및 피스톤 핀 보스부가 형성되는 스컷부를 포함하는 알루미늄 합금제 피스톤에 있어서, 상기 피스톤 상면 하부의 몸체내에는 판상의 강재스트립이 주조시 매설된 것을 특징으로 한다.In order to achieve the above object, the piston of the present invention comprises an aluminum alloy piston including a piston upper surface and a cut portion formed with a land portion and a piston pin boss portion, wherein a plate-like steel strip is cast in the body below the upper piston surface. It is characterized by being buried.

이하 본 발명의 구성과 작용을 첨부한 도면을 참조하여 설명한다.Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 강재스트립을 나타내는 사시도이며, 도 2는 본 발명에 의한 피스톤을 나타내는 정단면도이다.1 is a perspective view showing a steel strip of the present invention, Figure 2 is a front sectional view showing a piston according to the present invention.

알루미늄 합금재로 형성되는 피스톤(1)의 상면(2)에는 요홈의 연소실(3)이 형성되어 있고, 상측면에는 랜드부(4)와 복수개의 링그루우브(5)들이 형성되어 있다.The combustion chamber 3 of the groove is formed in the upper surface 2 of the piston 1 formed of the aluminum alloy material, and the land portion 4 and the plurality of ring grooves 5 are formed in the upper surface.

그리고 하부로 연장된 스컷부(6)에는 피스톤 핀이 삽입되어 계합되는 피스톤 핀 보스부(7)가 형성되어 있다.And the piston pin boss part 7 which piston pin is inserted and engaged is formed in the cut part 6 extended below.

또 연소실(3)의 하부로 피스톤(1)의 몸체내에는 강재의 스트립(8)이 매설되어 있으며, 이 강재스트립(8)은 피스톤(1)을 주조시 함께 매설되어지게 된다.In the lower part of the combustion chamber 3, a steel strip 8 is embedded in the body of the piston 1, and the steel strip 8 is embedded together when casting the piston 1.

강재스트립(8)은 고탄소강이나 피아노강, 스테인레스강 또는 인바라고 불리는 니켈 합금강 등 탄성이 강하고 굽힘강성이 우수하며 열팽창계수가 작은금속재의 판재를 내부에 탄성을 갖도록 호형상으로 제작되며, 피스톤(1) 몸체내에 매설되도 록 주조되었을 때 중앙부가 상부측으로 볼록하도록 호형으로 설치되어지며, 이와같이 설치하는 이유는 폭발력 Fg에 대한 반력작용과 상관관계를 가지기 때문이다.The steel strip 8 is made of an arc shape to have a high elasticity, excellent bending stiffness, and a low coefficient of thermal expansion, such as high carbon steel, piano steel, stainless steel, or nickel alloy steel called invar, to have an elastic shape inside. 1) When it is cast to be embedded in the body, it is installed in an arc shape so that the center part is convex to the upper side. The reason for this installation is because it has a correlation with the reaction force on the explosive force Fg.

이와같은 본 발명은 연소가스가 폭발하여 폭발력 Fg가 피스톤(1)에 작용하면 그 폭발력 Fg은 강재스트립(8)에 굽힘력으로 작용하게 되나 강재스트립(8)의 펼쳐지려는 굽힘강성이 커서 모서리(9)에 하중이 작용하는 것을 차단하여 Fg와 반력 FR에 의한 반복작용 하중에 대하여 피스톤(1) 모서리(9)에의 크랙발생을 방지하게 된다.In the present invention as described above, when the combustion gas explodes and the explosive force Fg acts on the piston 1, the explosive force Fg acts as a bending force on the steel strip 8, but the bending rigidity to be unfolded of the steel strip 8 is large and the edge ( 9) It prevents the load from acting and prevents the occurrence of crack in the edge of the piston (1) against the repeated action load by Fg and reaction force F R.

도면중 부호 10은 피스톤(1) 주조시 위치결정하는 지그가 강재스트립(8)에 끼워져 지지하기 위한 구멍이고, 11은 피스톤(1) 주조시 위치결정 지그가 관통할 수 있도록 강재스트립(8) 하부의 피스톤 상면(2) 몸체내에 형성된 홀이다.In the drawing, reference numeral 10 denotes a hole for supporting the jig for positioning during casting of the piston 1 to be inserted into the steel strip 8, and 11 denotes a steel strip 8 for allowing the positioning jig to penetrate during casting of the piston 1. It is a hole formed in the lower piston upper surface (2) body.

이상과 같은 본 발명에 의하면 연소실 하부의 피스톤 몸체내에 굽힘강성이 우수한 강재스트립을 주조시 함께 매설하므로써 폭발력과 반력의 교반하중의 작용에 대하여 굽힘강성이 크게 높아져 피스톤의 크랙발생이 감소되어지게 됨에 따라 피스톤의 압축높이 및 피스톤 핀 외경의 축소가 가능하며 피스톤 무게 저감으로 펌핑로스가 감소되는 효과가 있다.



According to the present invention as described above, by buried together the steel strip having excellent bending rigidity in the piston body of the lower part of the combustion chamber, the bending stiffness is greatly increased against the action of the agitation load of the explosive force and reaction force to reduce the occurrence of cracks in the piston It is possible to reduce the compression height of the piston and the outer diameter of the piston pin and reduce the pumping loss by reducing the piston weight.



Claims (4)

피스톤 상면(2)과 랜드부(4) 및 피스톤 핀 보스부(7)가 형성되는 스컷부(6)를 포함하는 알루미늄 합금제 피스톤에 있어서,In an aluminum alloy piston comprising a piston upper surface (2), a cut portion (6) formed with a land portion (4) and a piston pin boss portion (7), 상기 피스톤 상면(2) 하부의 몸체내에는 중앙부가 상부측으로 볼록하게 휘어져 있는 호형상을 갖는 판상의 강재스트립(8)이 매설되되, 상기 강재스트립(8) 하부의 몸체에는 피스톤(1) 주조시 위치결정 지그가 관통하는 홀(11)이 형성되고, 상기 강재스트립(8)에는 피스톤(1) 주조시 상기 위치결정 지그가 끼워져 지지되는 구멍(10)이 형성되는 것을 특징으로 하는 내구력 향상을 위한 개선된 구조의 피스톤.In the body of the lower piston upper surface (2) is embedded a plate-like steel strip (8) having an arc shape in which the center portion is convexly curved to the upper side, when the piston (1) casting on the body of the lower steel strip (8) A hole 11 through which a positioning jig penetrates is formed, and the steel strip 8 is provided with a hole 10 through which the positioning jig is inserted and supported when the piston 1 is cast. Piston with improved construction. 삭제delete 삭제delete 삭제delete
KR1019990055300A 1999-12-07 1999-12-07 Pistion structure to improve durability KR100580703B1 (en)

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KR100580703B1 true KR100580703B1 (en) 2006-05-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56118934U (en) * 1980-02-14 1981-09-10
JPS56163639U (en) * 1980-05-02 1981-12-04
JPH09209829A (en) * 1996-01-31 1997-08-12 Aisin Seiki Co Ltd Piston for internal combustion engine
JPH10176598A (en) * 1996-12-18 1998-06-30 Aisin Seiki Co Ltd Direct injection piston

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56118934U (en) * 1980-02-14 1981-09-10
JPS56163639U (en) * 1980-05-02 1981-12-04
JPH09209829A (en) * 1996-01-31 1997-08-12 Aisin Seiki Co Ltd Piston for internal combustion engine
JPH10176598A (en) * 1996-12-18 1998-06-30 Aisin Seiki Co Ltd Direct injection piston

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