JPS61167142A - Sleeveless cylinder - Google Patents
Sleeveless cylinderInfo
- Publication number
- JPS61167142A JPS61167142A JP674285A JP674285A JPS61167142A JP S61167142 A JPS61167142 A JP S61167142A JP 674285 A JP674285 A JP 674285A JP 674285 A JP674285 A JP 674285A JP S61167142 A JPS61167142 A JP S61167142A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- cylinder hole
- laser beam
- hardening
- sleeveless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
-
- 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
- F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
- F16J10/02—Cylinders designed to receive moving pistons or plungers
- F16J10/04—Running faces; Liners
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、レーザ光によりシリンダ内周面に所定パター
ンの部分焼入れ層を形成したスリーブレスシリンダに関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sleeveless cylinder in which a partially hardened layer in a predetermined pattern is formed on the inner circumferential surface of the cylinder using a laser beam.
〔従来の技術と発明が解決しようとする問題点〕従来の
エンジン用シリンダブロック（クランクケース）は、一
般にＦ２５Ｃ主体の鋳鉄から形成されているが、シリン
ダ孔内面の耐摩耗性を確保するためにシリンダ内周面に
は耐摩耗性に優れた高リン鋳鉄製等のスリーブ（ライナ
ー）が装着されている。ところが、このようなスリーブ
は高価であると共にエンジンの重量増加という結果を招
くため、促′来よりシリンダのスリーブレス化が強く要
求されている。[Prior art and problems to be solved by the invention] Conventional engine cylinder blocks (crankcases) are generally made of F25C-based cast iron, but in order to ensure wear resistance on the inner surface of the cylinder hole, A sleeve (liner) made of high phosphorus cast iron or the like with excellent wear resistance is attached to the inner peripheral surface of the cylinder. However, such sleeves are expensive and increase the weight of the engine, so there has been a strong demand for sleeveless cylinders.
また、エンジン用スリーブの摩耗が著しい箇所はピスト
ン上死点付近であるが、従来のスリーブでは上死点付近
のみの耐摩耗性を向上させることは困難であるため、ス
リーブ全体を高価な材料より形成しなければならず、コ
ストの面からも不合理であった。In addition, the wear of engine sleeves is significant near the top dead center of the piston, but with conventional sleeves, it is difficult to improve the wear resistance only near top dead center, so the entire sleeve is made of expensive materials. It was unreasonable from a cost standpoint.
そこで、最近ではスリーブレス化のためにシリンダブロ
ックのシリンダ孔内面に高周波焼入れを行う方法も検討
されているが、この高周波焼入れ法は焼入れ歪みの発生
や生産性に欠けるなどの欠点を有し、未だ実用化されて
いないのが現状である。Therefore, recently, a method of induction hardening the inner surface of the cylinder hole of the cylinder block has been considered in order to make the cylinder block sleeveless, but this induction hardening method has drawbacks such as generation of hardening distortion and lack of productivity. The current situation is that it has not yet been put into practical use.
本発明はこのような事情に鑑みなされたもので、その目
的とするところは耐摩耗性に優れたスリーブレスシリン
ダを提供することにある。 ・〔問題点を解決するため
の手段〕
本発明は上記の目的を達成するために、エンジンなどシ
リンダ孔内面に所定パターンの部分焼入れ層をレーザ光
により形成したことを特徴とするものである。The present invention was made in view of these circumstances, and its purpose is to provide a sleeveless cylinder with excellent wear resistance. - [Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that a partially hardened layer of a predetermined pattern is formed on the inner surface of a cylinder hole of an engine or the like using a laser beam.
以下、本発明の一実施例を第１図ないし第５図を参照し
て説明する。Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5.
第１図は本実施例に用いられるレーザ光焼入れ装置の概
略構成を示す図で、図中１は図示しないレーザ発振器か
ら出たレーザ光（例えばＣＯ２レーザ）である。このレ
ーザ光１はペンドミラー２により直角方向に方向変換さ
れ、次いで集光レンズ３を通過後、銅製ミラー４により
再度直角方向に方向変換されて第３図に示すシリンダブ
ロック１１のシリンダ孔内面１２に照射されるようにな
っている。FIG. 1 is a diagram showing a schematic configuration of a laser beam hardening apparatus used in this embodiment, and numeral 1 in the figure represents a laser beam (for example, a CO2 laser) emitted from a laser oscillator (not shown). The direction of this laser beam 1 is changed perpendicularly by a pend mirror 2, and after passing through a condensing lens 3, the direction is again changed perpendicularly by a copper mirror 4, and it enters the inner surface 12 of the cylinder hole of the cylinder block 11 shown in FIG. It is now irradiated.
上記銅製ミラー４は第２図に示す如く銅製ミラー支持ノ
ズル５によって支持され、モータ６によりタイミングベ
ルト７を介して銅製ミラー支持ノズル５と一体に回転す
るようになっている。また銅製ミラー４．銅製ミラー支
持ノズル５．銅製ミラー回転用モータ６および集光レン
ズ３は一体的構造となっており、モータ８と連結したボ
ールネジ９の回転により上下方向にガイド１０によって
案内されながら昇降動作するようになっている。The copper mirror 4 is supported by a copper mirror support nozzle 5 as shown in FIG. 2, and is rotated together with the copper mirror support nozzle 5 by a motor 6 via a timing belt 7. Also a copper mirror 4. Copper mirror support nozzle 5. The copper mirror rotation motor 6 and the condensing lens 3 have an integral structure, and are moved up and down by the rotation of a ball screw 9 connected to the motor 8 while being guided by a guide 10 in the vertical direction.
なお、シリンダ孔内面１２のレーザ光照射径は集光レン
ズ３と銅製ミラー４との距離を変化させることにより任
意に設定でき、シリンダ孔内径が変化してもレーザ光１
の照射径を常に一定に調整できるようになっている。ま
たシリンダ孔内面１２にはＣＯ２レーザの波長１０ｐｒ
ｌを吸収し易くするために耐熱塗料（図示せず）が塗布
されている。The diameter of the laser beam irradiation on the inner surface 12 of the cylinder hole can be set arbitrarily by changing the distance between the condenser lens 3 and the copper mirror 4, so even if the inner diameter of the cylinder hole changes, the laser beam 1
The irradiation diameter can always be adjusted to a constant value. In addition, on the inner surface 12 of the cylinder hole, a CO2 laser with a wavelength of 10pr is installed.
A heat-resistant paint (not shown) is applied to facilitate the absorption of l.
次に本実施例の作用について説明する。Next, the operation of this embodiment will be explained.
上記構成のレーザ光焼入れ装置によると、銅製ミラー４
は銅製ミラー回転用モータ６によりシリンダ孔内を周方
向に３６００回転し、また銅製ミラー昇降用モータ８に
よりシリンダ孔内を軸方向に昇降する。したがって、シ
リンダ孔内面１２の周方向の焼入れ速度は銅製ミラー回
転用モータ６の回転速度を調整することにより任意に設
定でき、シリンダ孔内面１２の軸方向の焼入れ速度は銅
製ミラー昇降用モータ８の回転速度を調整することによ
り任意に設定できるので、上記両モータ６゜８の回転速
度とレーザ光１の発振条件（パルス発振か連続発振等）
を組合せることにより、シリンダ孔内面１２に所定パタ
ーンの部分焼入れ層を形成することができる。According to the laser beam hardening device having the above configuration, the copper mirror 4
is rotated 3600 times in the circumferential direction within the cylinder hole by a copper mirror rotation motor 6, and is moved up and down in the cylinder hole in the axial direction by a copper mirror lifting motor 8. Therefore, the hardening speed of the inner surface of the cylinder hole 12 in the circumferential direction can be arbitrarily set by adjusting the rotation speed of the motor 6 for rotating the copper mirror, and the hardening speed of the inner surface of the cylinder hole 12 in the axial direction can be set arbitrarily by adjusting the rotation speed of the motor 6 for rotating the copper mirror. Since the rotation speed can be set arbitrarily by adjusting the rotation speed, the rotation speed of both motors 6°8 and the oscillation condition of laser beam 1 (pulse oscillation or continuous oscillation, etc.)
By combining these, it is possible to form a partially hardened layer in a predetermined pattern on the inner surface 12 of the cylinder hole.
第４図および第５図はシリンダ孔内面の焼入れパターン
を示す図で、第４図はレーザ光１をパルス発振させてシ
リンダ孔内面１２に市松模様の焼入れパターンを形成し
た例を示すもので、第５図はレーザ光１を連続発振させ
てシリンダ孔内面１２にスパイラル状模様の焼入れパタ
ーンを形成した例を示すものである。なお図中斜線部２
１は焼入れ部を示し、２２は非焼入れ部である。4 and 5 are diagrams showing hardening patterns on the inner surface of the cylinder hole, and FIG. 4 shows an example in which a checkered hardening pattern is formed on the inner surface 12 of the cylinder hole by pulse oscillation of the laser beam 1. FIG. 5 shows an example in which a spiral hardening pattern is formed on the inner surface 12 of the cylinder hole by continuously oscillating the laser beam 1. Note that the shaded area 2 in the figure
1 represents a hardened portion, and 22 represents a non-hardened portion.
次にシリンダ孔内面１２に市松模様の焼入れパターンを
形成した場合の作用について説明する。Next, the effect when a checkered hardening pattern is formed on the inner surface 12 of the cylinder hole will be explained.
エンジン用シリンダ素材は一般に鋳鉄（Ｆ２５Ｃ等）が
用いられ、母材すなわち非焼入れ部２２の硬度はビッカ
ース硬度で約２００〜２５０程度であるが、レーザ光１
により焼入れされた部分（焼入れ部２１）はごッカース
硬度で約７５０〜８００程度の硬度となる。これにより
シリンダ孔内面１２には硬化部と非硬化部が周方向およ
び軸方向に交互に形成され、市松模様の焼入れパターン
となる。この市松模様の焼入れパターンは、エンジンの
作動時に非焼入れ部２２はピストンによって選択的に摩
耗し、焼入れ部２１との間に極微少な段差を生じ、この
段差が潤滑油の油溜りとなって油膜の形成および保持に
貢献する作用をなすので、シリンダ孔内面１２の耐摩耗
性が向上する。Cast iron (F25C, etc.) is generally used as the engine cylinder material.
The hardened portion (hardened portion 21) has a Gockers hardness of about 750 to 800. As a result, hardened portions and non-hardened portions are formed alternately in the circumferential direction and the axial direction on the inner surface 12 of the cylinder hole, resulting in a checkered hardened pattern. This checkered hardening pattern means that when the engine is operating, the unhardened part 22 is selectively worn away by the piston, creating a minute difference in level between it and the hardened part 21, and this step becomes a pool of lubricating oil, resulting in an oil film. Since this contributes to the formation and retention of the cylinder hole, the wear resistance of the inner surface 12 of the cylinder hole is improved.
このように本実施例においては、シリンダ孔内面１２に
市松模様の焼入れパターンを形成したことにより耐摩耗
性が向上し、従来のようにスリーブ等をシリンダ孔内面
に装着する必要がないので、エンジンの製造コスト低減
および重量軽減を図ることができる。なお、シリンダ孔
内面１２にスパイラル状模様の焼入れパターンを形成し
ても上記市松模様の焼入れパターンと同様に耐摩耗性を
向上させることができる。In this way, in this embodiment, the wear resistance is improved by forming the checkered hardening pattern on the inner surface 12 of the cylinder hole, and there is no need to attach a sleeve or the like to the inner surface of the cylinder hole as in the conventional case. It is possible to reduce manufacturing costs and weight. Note that even if a spiral hardening pattern is formed on the inner surface 12 of the cylinder hole, the wear resistance can be improved in the same way as the checkered hardening pattern described above.
また本発明は上記実施例に限定されるものではなく、エ
ンジン用シリンダ以外の油圧機器シリンダ等の内面焼入
れにも適用可能である。Furthermore, the present invention is not limited to the above-mentioned embodiments, but can also be applied to the internal hardening of hydraulic equipment cylinders other than engine cylinders.
以上の説明から明らかなように本発明によれば、シリン
ダ孔内面にレーザ光照射により所定パターンの部分焼入
れ層を形成したので、耐摩耗性に優れたスリーブレスシ
リンダを得ることができる。As is clear from the above description, according to the present invention, a partially hardened layer with a predetermined pattern is formed on the inner surface of the cylinder hole by laser beam irradiation, so a sleeveless cylinder with excellent wear resistance can be obtained.
第１図ないし第５図は本発明の一実施例を示す図で、第
１図はレーザ光焼入れ装置の概略構成図、第２図は同装
置の銅製ミラー支持部を示す断面図、第３図はシリンダ
ブロックの縦断面図、第４図および第５図はシリンダ孔
内面の焼入れパターンを示す図である。
１・・・レーザ光、２・・・ペンドミラー、３・・・集
光レンズ、４・・・銅製ミラー、６・・・銅製ミラー回
転用モータ、８・・・銅製ミラー昇降用モータ、１２・
・・シリンダ孔内面、２１・・・焼入れ部、２２・・・
非焼入れ部。
出願人復代理人 弁理士 鈴江武彦
第１図
第３図
第４図
第５図
２１２２゛1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram of a laser beam hardening device, FIG. 2 is a cross-sectional view showing a copper mirror support part of the same device, and FIG. The figure is a longitudinal sectional view of the cylinder block, and FIGS. 4 and 5 are diagrams showing the hardening pattern on the inner surface of the cylinder hole. DESCRIPTION OF SYMBOLS 1... Laser light, 2... Pend mirror, 3... Condensing lens, 4... Copper mirror, 6... Copper mirror rotation motor, 8... Copper mirror lifting motor, 12.
...Cylinder hole inner surface, 21...Hardened part, 22...
Non-hardened part. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 5 2122゛
Claims (1)
光照射により所定パターンの部分焼入れ層を形成せしめ
てなるスリーブレスシリンダ。A sleeveless cylinder formed by forming a partially hardened layer in a predetermined pattern on the inner peripheral surface of the cylinder made of hardenable metal by irradiating laser light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP674285A JPS61167142A (en) | 1985-01-18 | 1985-01-18 | Sleeveless cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP674285A JPS61167142A (en) | 1985-01-18 | 1985-01-18 | Sleeveless cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61167142A true JPS61167142A (en) | 1986-07-28 |
Family
ID=11646656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP674285A Pending JPS61167142A (en) | 1985-01-18 | 1985-01-18 | Sleeveless cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61167142A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006291879A (en) * | 2005-04-12 | 2006-10-26 | Hitachi Constr Mach Co Ltd | Cylinder block for hydraulic rotor |
| US20130171473A1 (en) * | 2011-12-30 | 2013-07-04 | Fih (Hong Kong) Limited | Method for making patterns on metal article and the resulting metal article |
-
1985
- 1985-01-18 JP JP674285A patent/JPS61167142A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006291879A (en) * | 2005-04-12 | 2006-10-26 | Hitachi Constr Mach Co Ltd | Cylinder block for hydraulic rotor |
| US20130171473A1 (en) * | 2011-12-30 | 2013-07-04 | Fih (Hong Kong) Limited | Method for making patterns on metal article and the resulting metal article |
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