KR20040026834A - Rubbing decrease type cam for camshaft - Google Patents

Rubbing decrease type cam for camshaft Download PDF

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Publication number
KR20040026834A
KR20040026834A KR1020020058440A KR20020058440A KR20040026834A KR 20040026834 A KR20040026834 A KR 20040026834A KR 1020020058440 A KR1020020058440 A KR 1020020058440A KR 20020058440 A KR20020058440 A KR 20020058440A KR 20040026834 A KR20040026834 A KR 20040026834A
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KR
South Korea
Prior art keywords
cam
roller
shaft
rolling
contact
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KR1020020058440A
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Korean (ko)
Inventor
최병영
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현대자동차주식회사
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Priority to KR1020020058440A priority Critical patent/KR20040026834A/en
Publication of KR20040026834A publication Critical patent/KR20040026834A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE: A friction reduction type cam of a cam shaft is provided to minimize frictional loss of a valve train by rolling-contacting a valve closed section with a nose section of a cam robe in the valve train. CONSTITUTION: A friction reduction type cam(22) of a cam shaft(30) includes a ring type roller(24), a cam robe(26), and a rolling-contact roller(28). The ring type roller is formed in certain diameter and thickness to be rotatable, interposing an intermediate journal(32) into the cam shaft. The cam robe is fixedly installed on the cam shaft of the ring type roller for assisting the rotation of the ring type roller, and is formed to expose the ring type roller and the rolling-contact roller in certain length. The rolling-contact roller is arranged on a side of a cam robe nose(34) in a diameter smaller than the ring type roller to be rotatively installed at a cam robe shaft(36). The cam robe shaft is fixedly installed at the cam robe for easily realizing surface-contact rotation of the rolling-contact roller.

Description

캠샤프트의 마찰저감형 캠 {RUBBING DECREASE TYPE CAM FOR CAMSHAFT }Friction Reduction Cam of Camshaft {RUBBING DECREASE TYPE CAM FOR CAMSHAFT}

본 발명은 캠샤프트의 마찰 저감형 캠에 관한 것으로, 더욱 상세하게는 유압 직동식 밸브 트레인에서 밸브 닫힌 구간과 캠로브의 노우즈 구간을 구름 접촉하게 하여 밸브트레인의 마찰 손실을 최소화할 수 있게 한 캠샤프트의 마찰 저감형 캠에 관한 것이다.The present invention relates to a friction reduction cam of a camshaft, and more particularly, a cam that makes contact between a valve closed section and a nose lobe section of a cam lobe in a hydraulic direct acting valve train to minimize frictional loss of the valve train. It relates to a friction reducing cam of the shaft.

도1은 종래기술에 따른 캠샤프트에 적용되는 구름접촉롤러를 구비한 캠로브을 도시한 도면이고, 도2는 종래기술에 따른 캠샤프트의 구름접촉롤러가 구비된 캠로브가 적용되는 엔진을 도시한 도면이며, 도3은 종래기술에 따른 구름접촉롤러가 구비된 캠로브의 한계를 설명하기 위한 그래프이다.1 shows a cam lobe having a rolling contact roller applied to a cam shaft according to the prior art, and FIG. 2 shows an engine to which a cam lobe equipped with a rolling contact roller of a cam shaft according to the prior art is applied. Figure 3 is a graph for explaining the limitation of the cam lobe with a rolling contact roller according to the prior art.

캠샤프트(2)에 밸브 트레인의 마찰손실을 저감하기 위하여 다수 설치되고 있는 US5,694,892에 나타난 캠로브(4)는 캠노우즈(6)측에 회전축(8)으로 구름접촉롤러(10)를 설치하고 있다.Cam lobes 4 shown in US Pat. No. 5,694,892, which are installed in the camshaft 2 in order to reduce the frictional loss of the valve train, have rolling contact rollers 10 installed on the cam nose 6 side with the rotation shaft 8. Doing.

이에 따라 엔진(12)의 밸브트레인(14)에 적용된 밸브 태핏(16)과 접촉하는 캠로브(4)의 구름접촉롤러(10)는 캠노우즈(6) 부분에서 구름 접촉을 하므로서 종래 미끄럼 접촉시 경우보다는 밸브 트레인의 마찰손실을 줄이고 있다.Accordingly, the rolling contact roller 10 of the cam lobe 4, which is in contact with the valve tappet 16 applied to the valve train 14 of the engine 12, makes a rolling contact at the cam nose 6 part, and thus, the conventional sliding contact Rather than reducing the valve train friction losses.

그러나 캠로브(4)와 태핏(16)이 밸브(18)를 직접 구동하는 직접구동식에는 태핏이 유압식인것과 태핏(16)이 단순히 버켓(BUCKET) 형식으로 된 기계식이 있다.However, in the direct drive type in which the cam lobes 4 and the tappets 16 directly drive the valves 18, there are mechanical types in which the tappets are hydraulic and the tappets 16 are simply bucket type.

유압식은 밸브가 닫힌 구간(C)에서는 캠로브와 태핏사이 간극이 항상제로로자동 조절되며 기계식은 밸브가 닫힌 구간(C)에서는 캠로브와 태핏사이에 약0.2~0.4 정도의 간극을 두고 있어 기계식 태핏의 경우 밸브 닫힌 구간(C)에서는 캠로브와 태핏사이의 접촉이 없으므로 마찰토크도 없게 된다.The hydraulic type automatically adjusts the gap between the cam lobe and tappet to zero automatically in the section where the valve is closed (C), and the mechanical type has a clearance of about 0.2 to 0.4 between the cam lobe and tappet in the valve closed section (C). In the case of the tappet, since there is no contact between the cam lobe and the tappet in the valve closed section (C), there is no friction torque.

그러나 유압식 태핏의 경우 캠로브와 태핏사이의 간극을 제로로 조절하기 위해 유압태핏이 어느 정도의 유압력으로 캠로브를 밀고 있어 밸브 닫힌 구간(C)에서 마찰토크가 발생하게 된다.However, in the case of the hydraulic tappet, the hydraulic tappet pushes the cam lobe with a certain amount of hydraulic force to adjust the gap between the cam lobe and the tappet to zero, so that friction torque occurs in the valve closed section (C).

따라서 밸브 리프트 곡선을 통해 캠노우즈 구간(N)인 대략 80°~ 90°회전각에서만 구름접촉을 한다.Therefore, through the valve lift curve, the rolling contact is made only at the rotation angle of approximately 80 ° to 90 °, which is the camnose section (N).

따라서 유압 태핏과 같이 전체구간 360°도 회전각에 대해 캠로브와 유압태핏이 접촉하여 구동하는 경우 노우즈 구간 외 나머지는 여전히 미끄럼 접촉을 하게 되어 밸브 트레인의 마찰 손실을 줄이는데 한계가 있는 문제점이 있다.Therefore, when the cam lobe and the hydraulic tappet are driven in contact with each other for the rotation angle of 360 °, such as the hydraulic tappet, the rest of the nose section is still in sliding contact, thereby reducing the frictional loss of the valve train.

상기한 바와 같이 이루어지는 종래기술의 문제점을 해소하기 위하여 제안된 것으로, 본 발명의 목적은 유압 직동식 밸브 트레인에서 밸브 닫힌 구간과 캠로브의 노우즈 구간을 구름 접촉하게 하여 밸브트레인의 마찰 손실을 최소화할 수 있게 한 캠샤프트의 마찰 저감형 캠에 관한 것이다.In order to solve the problems of the prior art made as described above, an object of the present invention is to make a contact between the valve closed section and the nose section of the cam lobe in the hydraulic direct acting valve train to minimize the friction loss of the valve train A friction reducing cam of a camshaft is made possible.

이를 실현하기 위한 본 발명은The present invention for realizing this

캠샤프트에 중간저널을 개재하면서 일정 직경과 두께로 형성되어 회전하게 조립 설치되는 링형 롤러와,A ring-shaped roller which is formed to have a predetermined diameter and thickness and is assembled to rotate while interposing an intermediate journal on the cam shaft;

상기 링형 롤러의 양측 캠샤프트에 고정 설치되는 캠로브와,A cam lobe fixed to both side cam shafts of the ring roller;

상기 캠로브간의 사이에 링형 롤러보다 작은 직경으로 캠로브 노우즈측에 배치되어 회전하게 캠로브축에 설치되는 구름 접촉롤러를 포함한 구성으로 이루어지는 캠샤프트의 마찰저감형 캠을 제공하는데 있다.A camshaft reducing cam of a camshaft comprising a rolling contact roller disposed on the cam lobe nose side with a diameter smaller than a ring-shaped roller between the cam lobes and rotatably installed on the cam lobe shaft.

도1은 종래기술에 따른 캠샤프트에 적용되는 캠로브를 도시한 도면.1 shows a cam lobe applied to a cam shaft according to the prior art.

도2는 종래기술에 따른 캠샤프트의 구름접촉롤러를 구비한 캠로브가 적용되는 엔진을 도시한 도면.2 is a view showing an engine to which a cam lobe having a rolling contact roller of a cam shaft according to the prior art is applied.

도3은 종래기술에 따른 구름접촉롤러를 구비한 캠로브의 적용 한계를 설명하기 위한 그래프.Figure 3 is a graph for explaining the application limit of the cam lobe with a rolling contact roller according to the prior art.

도4는 본 발명에 따른 마찰저감형 캠을 도시한 측단면도.Figure 4 is a side cross-sectional view showing a friction reducing cam according to the present invention.

도5는 도4의 A-A를 도시한 도면.FIG. 5 shows A-A of FIG. 4; FIG.

도6은 본 발명에 따른 마찰저감형 캠과 종래 캠에 의한 캠샤프트 구동토크를 비교한 그래프.Figure 6 is a graph comparing the camshaft driving torque by the friction reducing cam according to the present invention and the conventional cam.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

22:마찰저감형 캠 24:링형 롤러22: friction reducing cam 24: ring roller

26:캠로브 28:구름접촉롤러26: cam lobe 28: cloud contact roller

30:캠샤프트 32:중간저널30: Camshaft 32: Medium Journal

34:캠로브 노우즈 36:캠로브축34: Cam robe nose 36: Cam robe shaft

이하, 본 발명의 바람직한 일 실시예를 첨부한 도면에 의하여 더욱 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in more detail.

도4는 본 발명에 따른 캠샤프트의 마찰저감형 캠을 도시한 측단면도이고, 도5는 도4의 A-A를 도시한 도면이다.Figure 4 is a side cross-sectional view showing a friction reducing cam of the camshaft according to the present invention, Figure 5 is a view showing A-A of FIG.

그리고 도6은 본 발명에 따른 마찰저감형 캠과 종래 캠에 의한 캠샤프트 구동토크를 비교한 그래프이다.6 is a graph comparing the camshaft driving torque by the friction reducing cam according to the present invention and the conventional cam.

캠샤프트의 마찰저감형 캠(22)은 링형 롤러(24), 캠로브(26), 구름접촉롤러(28)를 포함한 구성으로 이루어지고 있다.The friction reducing cam 22 of the camshaft is comprised with the ring roller 24, the cam lobe 26, and the rolling contact roller 28. As shown in FIG.

상기한 링형롤러(24)는 캠샤프트(30)에 중간저널(32)을 개재하면서 일정 직경과 두께로 형성되어 회전하게 조립 설치되고 있다.The ring roller 24 is formed to have a predetermined diameter and thickness while being interposed between the intermediate journal 32 on the cam shaft 30, and is assembled to rotate.

캠로브(26)는 링형 롤러(24)의 양측 캠샤프트(30)에 고정 설치되어 링형롤러(24)의 회전을 보조하고 있으며, 링형 롤러(24)와 구름접촉롤러(28)를 일정 길이 노출시키게 형성되어 지지하게 하고 있다.The cam lobe 26 is fixed to both cam shafts 30 of the ring roller 24 to assist rotation of the ring roller 24, and exposes the ring roller 24 and the rolling contact roller 28 to a predetermined length. It is formed to be supported.

그리고 캠로브(26)는 링형 롤러(24)와 구름접촉롤러(28)간의 사이에 태핏과의 접촉을 부드럽게 가지도록 일정 곡률로 형성되어 이루어지고 있다.The cam lobe 26 is formed to have a constant curvature so as to have a smooth contact with the tappet between the ring-shaped roller 24 and the rolling contact roller 28.

구름 접촉롤러(28)는 캠로브(26)간의 사이에 링형 롤러(24)보다 작은 직경으로 캠로브 노우즈(34)측에 배치되어 회전하게 캠로브축(36)에 설치되고 있다.The rolling contact roller 28 is arranged on the cam lobe shaft 36 so as to rotate on the cam lobe nose 34 side with a smaller diameter than the ring-shaped roller 24 between the cam lobes 26.

상기한 캠로브축(36)은 캠로브(26)에 고정 설치되어 구름 접촉롤러(28)의 면 접촉 회전을 용이하게 하고 있다.The cam lobe shaft 36 is fixed to the cam lobe 26 to facilitate the surface contact rotation of the rolling contact roller 28.

상기한 바와 같이 이루어지는 본 발명의 작용을 도4,5(참조 도2,3)에 의하여 설명하면, 밸브의 닫힘 구간(C)에서는 링형 롤러(24)와 태핏(16)이 접촉해 있으며 서로 구름접촉을 하므로 미끄럼 마찰때보다 마찰손실이 적게 발생한다.4 and 5 (refer to Figs. 2 and 3), the ring-shaped roller 24 and the tappet 16 are in contact with each other in the closing section C of the valve. Because of the contact, less friction loss occurs than sliding friction.

그리고 밸브가 열리기 시작하는 구간에서는 캠로브(26)의 열림램프구간(38)과 태핏(16)이 미끄럼 접촉을 하게 되고, 밸브 닫힌 구간(C)에서는 밸브 열림구간의 경계부분에서는 태핏에 충격없이 부드럽게 접촉 작동한다.In the section where the valve starts to open, the open lamp section 38 and the tappet 16 of the cam lobe 26 are in sliding contact, and in the valve closing section C, the tappet is not impacted at the boundary of the valve opening section. Gently touches and works.

따라서 열림램프구간(38)이 종료되면 구름접촉롤러(28)가 태핏(16)과 구름 접촉을 시도하여 접촉하게 되고, 이때 경계구간도 열림램프구간(38)에서 구름접촉롤러(28)에 이르는 외곽선이 부드럽게 형성되어 접촉하므로서 태핏(16)과 충격없이 접촉하여 작동력을 전달하게 된다.Therefore, when the open lamp section 38 is finished, the rolling contact roller 28 is brought into contact with the tappet 16 by rolling contact, and the boundary section also reaches the rolling contact roller 28 from the open lamp section 38. The contour is smoothly formed and in contact with the tappet 16 to transmit the operating force without impact.

따라서 구름 접촉롤러(28)와 태핏(16)의 접촉이 종료되면 닫힘램프구간(40)이 태핏(16)과 미끄럼 접촉을 시작함과 동시에 닫힘램프구간(40)이 종료되면 구름접촉롤러(28)와 태핏(16)간 구름접촉을 시작하게 된다.Accordingly, when the contact between the rolling contact roller 28 and the tappet 16 is terminated, the closing lamp section 40 starts sliding contact with the tappet 16 and at the same time the closing lamp section 40 ends, the rolling contact roller 28 ) And the tappet 16 starts rolling contact.

한편 닫힘램프구간(40)과 부드럽게 형성하므로서 구름접촉롤러(28)의 접촉 시작점에서도 태핏에 충격은 전달되지 않고 작동하게 된다.On the other hand, by forming the closing lamp section 40 smoothly, even when the contact point of the rolling contact roller 28, the impact is not transmitted to the tappet is operated.

상기한 본 발명은 유압 직동식 밸브 트레인에서 밸브 닫힘구간과 캠로브 노우즈 구간을 구름 접촉하게 하므로써 밸브 트레인의 마찰 손실을 최소화 (도6참조) 할 수 있어 내구성을 정숙성을 증대시켜 제품성을 높이게 되는 효과가 있다.According to the present invention, the frictional loss of the valve train can be minimized (see FIG. 6) by making the valve closing section and the camlobe nose section contact with each other in the hydraulic linear valve train, thereby increasing the productiveness by increasing the quietness and durability. It works.

Claims (1)

캠샤프트에 중간저널을 개재하면서 일정 직경과 두께로 형성되어 회전하게 조립 설치되는 링형 롤러와,A ring-shaped roller which is formed to have a predetermined diameter and thickness and is assembled to rotate while interposing an intermediate journal on the cam shaft; 상기 링형 롤러의 양측 캠샤프트에 고정 설치되면서 태핏과의 부드러운 접촉을 하게 일정 곡률로 형성된 캠로브와,A cam lobe fixedly installed at both side cam shafts of the ring-shaped roller and formed to have a predetermined curvature to make smooth contact with the tappet, 상기 캠로브간의 사이에 링형 롤러보다 작은 직경으로 캠로브 노우즈측에 배치되어 회전하게 캠로브축에 설치되는 구름 접촉롤러를 포함한 구성으로 이루어짐을 특징으로 하는 캠샤프트의 마찰저감형 캠.And a rolling contact roller disposed on the cam lobe side with a smaller diameter than the ring-shaped roller between the cam lobes and configured to rotate on the cam lobe shaft.
KR1020020058440A 2002-09-26 2002-09-26 Rubbing decrease type cam for camshaft KR20040026834A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100922776B1 (en) * 2007-12-27 2009-10-21 한국생산기술연구원 Combination Structure Of Light Weight Cam Shaft Using Thermal Expansion Coefficient
KR101456329B1 (en) * 2011-03-28 2014-11-03 미쯔비시 지도샤 고교 가부시끼가이샤 Cam structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63147505U (en) * 1987-03-19 1988-09-28
JPH07224611A (en) * 1994-02-10 1995-08-22 Toyota Motor Corp Valve system for internal combustion engine
KR19980041272U (en) * 1996-12-23 1998-09-15 박병재 cam
JP2001355709A (en) * 2000-06-13 2001-12-26 Yamamoto Seisakusho:Kk Cam piece of assembling cam shaft and method of manufacturing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63147505U (en) * 1987-03-19 1988-09-28
JPH07224611A (en) * 1994-02-10 1995-08-22 Toyota Motor Corp Valve system for internal combustion engine
KR19980041272U (en) * 1996-12-23 1998-09-15 박병재 cam
JP2001355709A (en) * 2000-06-13 2001-12-26 Yamamoto Seisakusho:Kk Cam piece of assembling cam shaft and method of manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100922776B1 (en) * 2007-12-27 2009-10-21 한국생산기술연구원 Combination Structure Of Light Weight Cam Shaft Using Thermal Expansion Coefficient
KR101456329B1 (en) * 2011-03-28 2014-11-03 미쯔비시 지도샤 고교 가부시끼가이샤 Cam structure

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