WO2016035373A1 - ローラー式ロッカーアーム - Google Patents
ローラー式ロッカーアーム Download PDFInfo
- Publication number
- WO2016035373A1 WO2016035373A1 PCT/JP2015/061489 JP2015061489W WO2016035373A1 WO 2016035373 A1 WO2016035373 A1 WO 2016035373A1 JP 2015061489 W JP2015061489 W JP 2015061489W WO 2016035373 A1 WO2016035373 A1 WO 2016035373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roller
- rocker arm
- inner ring
- ring roller
- resin
- Prior art date
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Classifications
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L2301/00—Using particular materials
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the present invention relates to a rocker arm type valve operating mechanism for an internal combustion engine, and more particularly to a structure of a sliding roller rocker arm with improved friction performance.
- a camshaft lift operation for opening and closing an intake / exhaust valve is transmitted directly using a tappet, and a rocker arm is transmitted using a rocker arm. It is classified as a formula. Both the tappet and rocker arm are installed between the camshaft and the intake / exhaust valve.When the valve is opened, it lifts while overcoming the valve spring reaction force, and when it is closed, it moves while being pushed back by the valve spring. A load that combines the inertial force of the valve system is constantly generated.
- This roller type includes a main body called a body, an outer ring roller that slides with a camshaft, a shaft that supports the outer ring roller, a small-diameter real shaft called a roller between the shaft and the outer ring roller, or a hollow roller called an inner ring. It consists of a total of four parts.
- the former method using a roller is classified as a rolling method, and the latter method using an inner ring roller is classified as a sliding method.
- FIG. 1A shows a schematic perspective view of a sliding rocker arm
- FIG. 1B shows a schematic perspective view of a rolling rocker arm.
- the slide-type rocker arm 10 includes a roller shaft 12, an inner ring roller 14 that is rotatably attached to the roller shaft 12, and an outer ring roller 16 that is rotatably attached to the outer periphery of the inner ring roller 14.
- the rolling rocker arm 20 includes a roller shaft 22, a plurality of needle rollers 24 that are rotatably attached to the outer periphery of the roller shaft 22, and a roller 26 that is rotatably attached to the outer periphery of the needle roller 24. .
- FIG. 2 is a view showing an example of a rolling rocker arm installed between the cam of the cam shaft and the valve stem of the intake / exhaust valve.
- the rocker arm includes a body 30 that rotatably holds a roller 26 as shown in FIG. 1B.
- One end 32 of the body 30 is supported by a pivot portion 34, and the other end 36 is intake / exhaust.
- a valve spring 39 that abuts against a cap 38 of the valve stem 37 of the valve and biases the end portion 36 of the rocker arm is attached below the cap 38.
- FIG. 2A shows another example in which the rocker arm is supported by a hydraulic lash adjuster.
- one end 32 of the rocker arm is brought into contact with a plunger 52 having a hemispherical top, and the plunger 52 is supported by a lash adjuster 50.
- the lash adjuster 50 supports the plunger 52 so as to be slidable in the axial direction.
- Such a lash adjuster type rocker arm is disclosed in Patent Documents 1 and 2, and allows lubricating oil to be easily supplied to the lubricating oil hole of the roller shaft via the lash adjuster.
- the rolling type is used in a state where the roller rolls when the engine is operating, the friction performance is better than the sliding type.
- the roller is in a sliding state close to line contact with the shaft or outer ring.
- the roller and the shaft have a small outer diameter and contact between the shaft and the convex R, so that the surface pressure is higher than the Hertz contact theory.
- the sliding type supports the lift load of the camshaft on the inner circumference of the outer ring roller and the outer circumference of the inner ring roller, the inner circumference of the inner ring roller and the outer circumference of the roller shaft.
- the inner ring roller and roller shaft which have the highest surface pressure, have a larger inner ring roller inner diameter than the roller and have a concave R and convex R contact with the roller shaft, so the surface pressure is lower than the rolling type. used. Since each sliding surface has a clearance and slides and moves relative to each other, the boundary lubrication state occurs particularly in the low rotation range, and the friction performance deteriorates.
- Patent Document 3 techniques for suppressing wear (Patent Document 3) and supplying lubricating oil efficiently (Patent Documents 4 and 5) are disclosed.
- Patent Document 6 a technique for preventing damage and seizure by processing a lubricating film on the peripheral surface of the inner ring roller is disclosed.
- the inner circumference of the outer ring roller and the outer circumference of the inner ring roller, the inner circumference of the inner ring roller, and the outer circumference of the roller shaft function as sliding surfaces, and clearances are provided in these portions.
- the sliding surface is manufactured by finishing the shape by polishing and then adjusting the surface roughness with a barrel.
- the conventional sliding rocker arm has a problem that in a low rotation region (mainly at a low rotation of 1000 rpm or less, such as when idling), the boundary lubrication state causes a larger friction than the rolling rocker arm.
- an object of the present invention is to provide a roller-type rocker arm that reduces friction from a low rotation range to a high rotation range of an engine.
- a roller-type rocker arm has a function of transmitting a rotational operation of a cam to an intake / exhaust valve, and includes a roller shaft and an inner ring slidably mounted on the outer peripheral surface of the roller shaft. It has a roller and an outer ring roller slidably mounted on the outer peripheral surface of the inner ring roller, and the inner ring roller is made of a resin material.
- the resin material is polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polybenzimidazole (PBI), polyimide (PI) or polyamide.
- PEEK polyether ether ketone
- PPS polyphenylene sulfide
- PTFE polytetrafluoroethylene
- PES polyether sulfone
- PBI polybenzimidazole
- PI polyimide
- PAI imide
- the resin material includes carbon fiber, CNT (carbon nanotube), CNC (carbon nanocoil), or reinforcing fiber reinforced with glass fiber.
- the reinforcing fiber is disposed substantially parallel to the sliding direction of the inner ring roller.
- an amorphous hard carbon film is formed on at least one of the outer peripheral surface of the inner ring roller and the counterpart member that slides with the inner peripheral surface.
- the inner ring roller by configuring the inner ring roller with a resin material, it is possible to reduce friction caused by sliding from a low rotation range to a high rotation range of the engine as compared with a conventional rolling roller rocker arm.
- FIG. 1A is a schematic perspective view showing a conventional roller rocker arm (slip type), and FIG. 1B is a schematic perspective view showing a conventional roller rocker arm (rolling type).
- It is a schematic diagram which shows an example by which a rocker arm is operated with a cam.
- It is a schematic diagram which shows the other example in which the rocker arm was applied to the internal combustion engine.
- It is a typical external appearance perspective view of the roller type rocker arm which concerns on the Example of this invention.
- FIG. 5 (A) is a perspective view of a roller shaft
- FIG.5 (B) is a perspective view of an inner ring
- FIG.5 (C) is FIG. It is a perspective view of an outer ring roller. It is sectional drawing of the roller type rocker arm which concerns on the Example of this invention.
- FIG. 3 is a perspective view showing the entire rocker arm according to the embodiment of the present invention
- FIG. 4 is a view in which a part of the body of the rocker arm shown in FIG. 3 is removed
- FIG. 5 is a perspective view of each component.
- FIG. 6 is a schematic sectional view of the rocker arm.
- a rocker arm according to an embodiment of the present invention is one of the components constituting a rocker arm type valve operating mechanism of a four-stroke internal combustion engine, and relates to a rocker arm that slides while sliding completely.
- the rocker arm 100 includes a body 110, a roller shaft 120 fixed in the body 110, and an inner ring rotatably mounted on the outer periphery of the roller shaft 120. It includes a roller 130 and an outer ring roller 140 that is rotatably mounted on the outer periphery of the inner ring roller 130.
- the body 110 is a metal member that supports the roller shaft 120, the inner ring roller 130, and the outer ring roller 140, and an opening 112A for supporting the pivot portion 34 (see FIG. 2) is formed in one end portion 112.
- the other end 114 is brought into contact with the cap 38 of the valve stem of the intake / exhaust valve.
- a pair of spaced side walls 116A and 116B are formed between one end 112 and the other end 114 of the body 110, and circular through holes 118 are formed in the pair of side walls 116A and 116B, respectively. It is formed.
- a roller shaft 120 is attached in the through hole 118 of the pair of side walls 116A and 116B.
- the roller shaft 120 is a cylindrical metal member having a uniform diameter D1, and is inserted into the through holes 118 of the pair of side walls 116A and 116B as described above.
- the diameter D1 of the roller shaft 120 is formed to be approximately equal to or slightly larger than the diameter of the through hole 118, and the roller shaft 120 is fastened into the through hole 118 by caulking or the like.
- the inner ring roller 130 is an annular member attached so as to cover the outer periphery of the roller shaft 120 between the pair of side walls 116A and 116B, and is made of a resin material. As shown in FIG. 5B, the inner ring roller 130 has an inner peripheral surface 132 having an inner diameter D2 and an outer peripheral surface 134 having an outer diameter D3. The inner diameter D2 is somewhat larger than the diameter D1 of the roller shaft 120, that is, formed to have a certain clearance so that D2> D1. As a result, the inner peripheral surface 132 of the inner ring roller 130 can slide on the outer peripheral surface 122 of the roller shaft 120.
- the outer ring roller 140 is an annular metal member attached so as to cover the outer periphery of the inner ring roller 130 between the pair of side walls 116A and 116B. As shown in FIG. 5C, the outer ring roller 140 has an inner peripheral surface 142 and an outer peripheral surface 144 having an inner diameter D4.
- the inner diameter D4 of the outer ring roller 140 is formed to have a certain clearance so that the outer diameter D3 of the inner ring roller 130 is somewhat larger, that is, D4> D3. As a result, the inner peripheral surface 142 of the outer ring roller 140 can slide on the outer peripheral surface 134 of the inner ring roller 130.
- the characteristic point of the rocker arm of this embodiment is that the inner ring roller 130 is made of a resin material as described above.
- the resin material is preferably one having excellent sliding properties with a metal material, wear resistance, and affinity with a lubricating oil, such as PEEK (polyether ether ketone), PPS (polyphenylene sulfide). ), PTFE (polytetrafluoroethylene), PES (polyethersulfone), PBI (polybenzimidazole), PI (polyimide), PAI (polyamideimide), and the like.
- the inner ring roller 130 is formed by molding such a resin material.
- a reinforcing member is mixed in the resin material in order to enhance the mechanical strength, wear resistance, etc. of the resin material.
- the reinforcing member is, for example, a reinforcing fiber such as carbon fiber, CNT (carbon nanotube), CNC (carbon nanocoil), or glass fiber.
- lubricating materials such as graphite and molybdenum disulfide, and wear-resistant fine particles such as metals and ceramics may be mixed.
- the reinforced fiber is arranged so as to be substantially parallel to the sliding direction (circumferential direction) of the inner ring roller 130, thereby causing friction. Further reduce.
- Comparative Example 1 is a rolling roller rocker arm (see FIG. 1B), and Comparative Example 2 is a sliding roller rocker arm made of a conventional metal material (see FIG. 1A).
- the numerical values are comparison data when the friction torque at each cam rotation of Comparative Example 1 is 1.
- the friction torque of the conventional sliding rocker arm is lower than that of the rolling rocker arm (Comparative Example 1) in the high rotation range, but is higher in the low rotation range.
- the friction is lower even in the low rotation range than the rolling rocker arm (Comparative Example 1), and the high rotation range is also lower than that of the conventional sliding rocker arm (Comparative Example 2).
- the inner ring roller 130 is made of the resin material, so that the friction can be reduced more than the conventional sliding rocker arm in the low rotation range to the high rotation range of the engine.
- an amorphous hard is applied to at least one of the sliding surface of the counterpart member that slides with the resin inner ring roller 130, that is, the inner circumferential surface of the outer ring roller 140 and the outer circumferential surface of the roller shaft 120.
- a carbon film (hereinafter referred to as a DLC (Diamond-like carbon) film) is formed.
- a DLC film can be formed by a PVD method, a CVD method, a PACVD method, or the like.
- the hydrogen content formed by PVD method, particularly arc ion plating method is 0.5 atomic% or less.
- the film thickness of the DLC film is, for example, 0.3 to 1.5 ⁇ m, preferably 1.0 ⁇ m or less in the PVD method. If it is CVD method, it can have a film thickness of about 20 micrometers.
- the friction between the inner ring roller 130 and the roller shaft 120 and / or the outer ring roller 140 is formed by forming a DLC film on the sliding surface of the roller shaft 120 that slides with the resin inner ring roller 130 and the sliding surface of the outer ring roller 140. Can be reduced.
- a DLC film may be formed on the outer circumferential surface or inner circumferential surface of the inner ring roller 130, the inner circumferential surface of the outer ring roller 140 and the outer circumferential surface of the inner ring roller 130, the outer circumferential surface of the roller shaft 120, and the inner ring roller 130.
- a DLC film may be formed on each of the inner peripheral surfaces.
- Rocker arm 110 Body 120: Roller shaft 122: Outer surface 130: Inner ring roller 132: Inner surface 134: Outer surface 140: Outer ring roller 142: Inner surface 144: Outer surface
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Sliding-Contact Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
110:ボディ
120:ローラー軸
122:外周面
130:内輪ローラー
132:内周面
134:外周面
140:外輪ローラー
142:内周面
144:外周面
Claims (5)
- カムの回転動作を吸排気バルブに伝達する機能を備えたローラー式ロッカーアームであって、
ローラー軸と、前記ローラー軸の外周面上に摺動可能に取付けられた内輪ローラーと、前記内輪ローラーの外周面上に摺動可能に取付けられた外輪ローラーとを有し、
前記内輪ローラーは、樹脂材料から構成されるローラー式ロッカーアーム。 - 前記樹脂材料は、ポリエーテルエーテルケトン樹脂、ポリフェニレンサルファイド樹脂、ポリテトラフルオロエチレン樹脂、ポリエーテルサルフォン樹脂、ボリベンゾイミダゾール樹脂、ポリイミド樹脂またはポリアミドイミド樹脂である、請求項1に記載のローラー式ロッカーアーム。
- 前記樹脂材料は、炭素繊維、CNT(カーボンナノチューブ)、
CNC(カーボンナノコイル)、またはガラス繊維で強化した強化繊維を含む、請求項1または2に記載のローラー式ロッカーアーム。 - 前記強化繊維は、前記内輪ローラーの摺動方向に対して略平行に配置される、請求項3に記載のローラー式ロッカーアーム。
- 前記内輪ローラーの外周面および内周面と摺動する相手方の部材の少なくとも一方には、非晶質硬質炭素被膜が形成される、請求項1ないし4いずれか1つに記載のローラー式ロッカーアーム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201580046854.6A CN106605043B (zh) | 2014-09-02 | 2015-04-14 | 滚子式摇臂 |
JP2016546336A JP6841658B2 (ja) | 2014-09-02 | 2015-04-14 | ローラー式ロッカーアーム |
US15/508,290 US10280813B2 (en) | 2014-09-02 | 2015-04-14 | Roller-type rocker arm |
EP15837873.7A EP3196430B1 (en) | 2014-09-02 | 2015-04-14 | Roller-type rocker arm |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2014-178412 | 2014-09-02 | ||
JP2014178412 | 2014-09-02 |
Publications (1)
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WO2016035373A1 true WO2016035373A1 (ja) | 2016-03-10 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2015/061489 WO2016035373A1 (ja) | 2014-09-02 | 2015-04-14 | ローラー式ロッカーアーム |
Country Status (5)
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---|---|
US (1) | US10280813B2 (ja) |
EP (1) | EP3196430B1 (ja) |
JP (1) | JP6841658B2 (ja) |
CN (1) | CN106605043B (ja) |
WO (1) | WO2016035373A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019010663A (ja) * | 2017-06-30 | 2019-01-24 | ユニバーサル製缶株式会社 | 成形ローラの摺動構造 |
US10934897B2 (en) | 2016-06-17 | 2021-03-02 | Nittan Valve Co., Ltd. | Mechanical lash adjuster |
WO2023074624A1 (ja) * | 2021-10-28 | 2023-05-04 | 株式会社リケン | ローラー式ロッカーアーム |
Citations (6)
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JPH0515524Y2 (ja) * | 1986-03-20 | 1993-04-23 | ||
JP2004278322A (ja) * | 2003-03-13 | 2004-10-07 | Nsk Ltd | カムフォロア装置 |
JP2006194139A (ja) * | 2005-01-13 | 2006-07-27 | Nsk Ltd | カムフォロア装置 |
JP2009030467A (ja) * | 2007-07-25 | 2009-02-12 | Ntn Corp | タペットローラ軸受構造 |
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JP2012241774A (ja) * | 2011-05-18 | 2012-12-10 | Nisshin Seisakusho:Kk | 回転体及びロッカーアーム |
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2015
- 2015-04-14 CN CN201580046854.6A patent/CN106605043B/zh active Active
- 2015-04-14 WO PCT/JP2015/061489 patent/WO2016035373A1/ja active Application Filing
- 2015-04-14 EP EP15837873.7A patent/EP3196430B1/en active Active
- 2015-04-14 US US15/508,290 patent/US10280813B2/en active Active
- 2015-04-14 JP JP2016546336A patent/JP6841658B2/ja active Active
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JPH0515524Y2 (ja) * | 1986-03-20 | 1993-04-23 | ||
JP2004278322A (ja) * | 2003-03-13 | 2004-10-07 | Nsk Ltd | カムフォロア装置 |
JP2006194139A (ja) * | 2005-01-13 | 2006-07-27 | Nsk Ltd | カムフォロア装置 |
JP2009030467A (ja) * | 2007-07-25 | 2009-02-12 | Ntn Corp | タペットローラ軸受構造 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10934897B2 (en) | 2016-06-17 | 2021-03-02 | Nittan Valve Co., Ltd. | Mechanical lash adjuster |
JP2019010663A (ja) * | 2017-06-30 | 2019-01-24 | ユニバーサル製缶株式会社 | 成形ローラの摺動構造 |
WO2023074624A1 (ja) * | 2021-10-28 | 2023-05-04 | 株式会社リケン | ローラー式ロッカーアーム |
Also Published As
Publication number | Publication date |
---|---|
US10280813B2 (en) | 2019-05-07 |
JP6841658B2 (ja) | 2021-03-10 |
EP3196430A1 (en) | 2017-07-26 |
JPWO2016035373A1 (ja) | 2017-06-15 |
EP3196430A4 (en) | 2018-04-25 |
CN106605043B (zh) | 2019-12-03 |
US20170284233A1 (en) | 2017-10-05 |
EP3196430B1 (en) | 2020-04-08 |
CN106605043A (zh) | 2017-04-26 |
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