JPH024763B2 - - Google Patents
Info
- Publication number
- JPH024763B2 JPH024763B2 JP13843081A JP13843081A JPH024763B2 JP H024763 B2 JPH024763 B2 JP H024763B2 JP 13843081 A JP13843081 A JP 13843081A JP 13843081 A JP13843081 A JP 13843081A JP H024763 B2 JPH024763 B2 JP H024763B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered alloy
- sintered
- sleeve
- cam lobe
- stem
- 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.)
- Expired
Links
- 239000000956 alloy Substances 0.000 claims description 51
- 229910045601 alloy Inorganic materials 0.000 claims description 42
- 239000007791 liquid phase Substances 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 239000007769 metal material Substances 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000005304 joining Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 14
- 239000002131 composite material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005219 brazing Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 but in recent years Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- 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
- F16H—GEARING
- F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
- F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
本発明は内燃機関の弁開閉用カムシヤフトであ
り、異種材料を複合した複合カムシヤフトに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is a camshaft for opening and closing valves of an internal combustion engine, and relates to a composite camshaft made of a composite of different materials.
内燃機関用カムシヤフトは従来鋳鉄又は鋼によ
るものが用いられていたが近年種々の材料を複合
した複合カムシヤフトが注目されている。 Conventionally, camshafts for internal combustion engines have been made of cast iron or steel, but in recent years, composite camshafts made of various materials have been attracting attention.
その理由として内燃機関の高速化、高出力化及び
軽量化の要求があげられる。即ち高速化に対応し
てカムフオロアとの摺動面であるカム表面の耐摩
耗性が必要となるが充分な耐摩耗性を有する材料
はチルド化又は焼入れした鋳鉄でしか得られなか
つた。一方、軽量化しようとした場合に強度に優
れる鋼を用いざるをえないものである。このため
耐摩耗性を要するカムロブと強度を要するステム
とを目的に応じた材料で形成し、これを組立てる
複合カムシヤフト、例えば実公昭51−7367号に示
される如き鋼鉄パイプによりなるステムに焼結合
金製カムロブを組付けたカムシヤフトが提案され
ている。この焼結合金製カムロブを用いたカムシ
ヤフトはカムロブとステムとの結合に問題があ
り、種々の考案がなされているもののそれぞれに
欠点がある。例えば特開昭54−102209号の如く、
圧粉体又は予備焼結したカムロブをステムに組付
け、これを液相焼結することにより焼結合金の収
縮と拡散を利用し結合するものがあるが、かかる
方法によればカムロブとステムの結合は強いもの
の、焼結炉中にカムシヤフト全体を通さねばなら
ず生産能率が低いばかりか、通常1250℃前後で焼
結されるため大型のカムシヤフトではステムに熱
による曲がりや歪を生じ易い。これに対して焼結
されたカムロブをろう付や溶接しようとした場合
に、焼結合金と鋼であるステムとが異種材料であ
る理由により溶接性やろう付性が低く充分な結合
強度が得難いばかりか、多孔質高硬度であり被削
性の悪い焼結合金のステムとの嵌合部を加工せね
ばならず生産性にも劣るものである。The reason for this is the demand for higher speed, higher output, and lighter weight of internal combustion engines. That is, in response to higher speeds, the cam surface, which is the sliding surface with the cam follower, needs to have wear resistance, but materials with sufficient wear resistance have only been available from chilled or hardened cast iron. On the other hand, when trying to reduce weight, it is necessary to use steel, which has excellent strength. For this reason, a composite camshaft is constructed by forming a cam lobe that requires wear resistance and a stem that requires strength from materials appropriate for the purpose and assembling them, for example, a stem made of steel pipe and a sintered alloy as shown in Utility Model Publication No. 7367/1983. A camshaft equipped with a manufactured cam lobe has been proposed. A camshaft using a sintered metal cam lobe has a problem in the connection between the cam lobe and the stem, and although various ideas have been made, each has its own drawbacks. For example, as in JP-A-54-102209,
There is a method in which a compacted powder or pre-sintered cam lobe is assembled to the stem, and this is liquid-phase sintered to utilize the shrinkage and diffusion of the sintered alloy to bond the cam lobe to the stem. Although the bond is strong, the entire camshaft must be passed through a sintering furnace, which not only lowers production efficiency, but also because sintering is usually done at around 1250°C, so large camshafts are prone to bending and distortion due to heat. On the other hand, when trying to braze or weld a sintered cam lobe, it is difficult to obtain sufficient bonding strength due to poor weldability and brazing properties because the sintered alloy and the steel stem are different materials. Moreover, the fitting part with the stem must be machined from a sintered alloy that is porous and highly hard and has poor machinability, resulting in poor productivity.
本発明はこれら従来のカムシヤフトの問題を解
決するものであり、カムロブを３層の複合材料と
することによりカムロブの耐摩耗性、強度、生産
性を向上し、かつカムシヤフトの組付生産性を向
上しうるものであり、以下本発明を詳細に説明す
る。 The present invention solves these problems with conventional camshafts, and by making the cam lobe a three-layer composite material, it improves the wear resistance, strength, and productivity of the cam lobe, and improves the assembly productivity of the camshaft. The present invention will be described in detail below.
まず本発明の要旨とするところは特許請求の範
囲に記載した如く下記４つの構成によりなるカム
シヤフトにある。 First, the gist of the present invention resides in a camshaft having the following four configurations as described in the claims.
(1) カムロブ３が外周側に第一焼結合金材４を配
されること。(1) The first sintered metal material 4 is arranged on the outer circumferential side of the cam lobe 3.
(2) カムロブ３が内周側に鋼製スリーブ２を配さ
れること。(2) The cam lobe 3 is provided with a steel sleeve 2 on its inner circumferential side.
(3) 第一焼結合金材４とスリーブ２間に第二焼結
合金材５を配すること。(3) Arranging the second sintered metal material 5 between the first sintered metal material 4 and the sleeve 2.
(4) スリーブ２とステム１とが結合されること。(4) Sleeve 2 and stem 1 are combined.
かかる本発明カムシヤフトを本発明の実施例で
ある第１図及び第１図のＡ−Ａ断面である第２図
に従つて説明する。 The camshaft of the present invention will be described with reference to FIG. 1, which is an embodiment of the present invention, and FIG. 2, which is a cross section taken along line A-A in FIG. 1.
カムシヤフトはステム１の軸端に結合されたブ
ツシユ１１にベルト車８を組付けて回転伝達され
る。又ステム１の他の軸端はキヤツプ１２で閉ざ
され、ステム１内は中空にされる。一方ジヤーナ
ル６、ギア７、カムロブ３がステム１に組付けら
れてカムシヤフトが形成される。この時にカムロ
ブ３は第一、第二焼結合金及びスリーブを予め結
合してカムロブ単体として形成されており、ジヤ
ーナル６、ギア７と同様の手段、例えば圧入、焼
ばめや溶接、ろう付によつてステムへ組付けられ
る。これは本発明ではカムロブ３のスリーブ２が
ステム１と結合されることにより可能となるもの
である。即ち焼結合金と鋼とを直接溶接又はろう
付しようとしても異種材料の接合という制約があ
るため充分な結合がなし難いものであつたのに対
して、本発明にあつてはカムロブとステムとが鋼
製のスリーブとステムの結合により達成され、か
かる同種材料は溶接性及びろう付性に優れており
充分な結合が可能となるものである。又靭性の劣
る焼結合金は圧入、焼入れによる結合は得難いも
のであつたが本発明ではカムロブがスリーブによ
つて補強されるため圧入、焼入れによつてもある
程度の結合力が得られ、比較的軽負荷の機関では
充分に使用され得る。 The rotation of the camshaft is transmitted by assembling a belt pulley 8 to a bush 11 connected to the shaft end of the stem 1. The other shaft end of the stem 1 is closed with a cap 12, and the inside of the stem 1 is made hollow. On the other hand, the journal 6, gear 7, and cam lobe 3 are assembled to the stem 1 to form a camshaft. At this time, the cam lobe 3 is formed as a single cam lobe by joining the first and second sintered alloys and the sleeve in advance, and is formed by the same means as the journal 6 and gear 7, such as press fitting, shrink fitting, welding, or brazing. It is then assembled onto the stem. This is made possible in the present invention because the sleeve 2 of the cam lobe 3 is connected to the stem 1. That is, even if an attempt was made to directly weld or braze the sintered alloy and the steel, it was difficult to achieve a sufficient bond due to the restriction of joining dissimilar materials, whereas in the present invention, the cam lobe and the stem This is achieved by joining the steel sleeve and stem, and such similar materials have excellent weldability and brazeability, making it possible to achieve a sufficient joint. In addition, it has been difficult to bond sintered alloys with poor toughness by press-fitting or quenching, but in the present invention, since the cam lobe is reinforced by a sleeve, a certain degree of bonding force can be obtained even by press-fitting or quenching. It can be used satisfactorily in lightly loaded engines.
前述の如く、カムロブ３は、第一焼結合金４と
第二焼結合金５及びスリーブ２により構成され、
一体化されるが、これは焼結合金の収縮と拡散に
よる結合が利用される。具体的には第一焼結合
金、第二焼結合金の圧粉体とスリーブを組付け、
これを焼結炉中で一体的に焼結することにより完
全な結合が達成される。これはスリーブと第一焼
結合金間に第二焼結合金が介材することによる。 As mentioned above, the cam lobe 3 is composed of the first sintered alloy 4, the second sintered alloy 5, and the sleeve 2,
This is done by utilizing the contraction and diffusion of the sintered alloy. Specifically, the first sintered alloy, the second sintered alloy compact and the sleeve are assembled,
Complete bonding is achieved by sintering this together in a sintering furnace. This is because the second sintered alloy is interposed between the sleeve and the first sintered alloy.
即ち単一の焼結合金の圧粉体とスリーブを一体
的に焼結した場合に、圧粉体とスリーブとの組付
上不可避的な組付けクリアランスが焼結完了後に
も残るという危検を防止することによる。この焼
結による結合が不充分になる理由としてまず耐摩
耗性の効果を要する焼結合金に添加されるCr，
Mo，Ni，Ｖ，Ｗ等の作用によつて焼結合金自体
のぬれ性が低下しスリーブとの結合が進み難いこ
とと焼結合金が液相発生時にスリーブとの拡散結
合を開始するため局所的に焼結合金とスリーブが
結合を開始するとある部分にはクリアランスが残
存してしまう理由による。 In other words, when a single sintered alloy green compact and a sleeve are sintered together, there is a risk that an unavoidable assembly clearance will remain even after sintering is completed. By preventing. The reason why this sintered bond is insufficient is that Cr is added to the sintered alloy, which requires wear resistance.
The wettability of the sintered alloy itself decreases due to the action of Mo, Ni, V, W, etc., making it difficult to bond with the sleeve, and the sintered alloy starts diffusion bonding with the sleeve when a liquid phase occurs, causing localization. This is because when the sintered alloy and the sleeve start to join together, a clearance remains in a certain part.
これに対して本発明にあつては耐摩耗性を要す
る第一焼結合金とスリーブ間に、第一焼結合金材
より液相発生温度の低い第二焼結合金を介在さ
せ、第一焼結合金が液相を発生し大きく収縮する
以前に第二焼結合金材が液相を発生し、スリーブ
と第一焼結合金間でのろう剤の役割をはたす。さ
らに第二焼結合金は当然第一焼結合金より長時間
液相状態にあるためスリーブ、第一焼結合金に対
しての拡散による結合がより進行し厳密な焼結温
度、時間の制約を受ける第一焼結合金より以上の
結合を達成することが可能となる。 In contrast, in the present invention, a second sintered alloy whose liquid phase generation temperature is lower than that of the first sintered alloy material is interposed between the first sintered alloy that requires wear resistance and the sleeve. Before the alloy generates a liquid phase and contracts significantly, the second sintered alloy material generates a liquid phase and acts as a brazing agent between the sleeve and the first sintered alloy. Furthermore, since the second sintered alloy naturally stays in a liquid phase for a longer period of time than the first sintered alloy, bonding by diffusion to the sleeve and the first sintered alloy progresses more, and strict sintering temperature and time constraints are required. It becomes possible to achieve a bond greater than that of the first sintered alloy that is received.
かかる第二焼結合金としてはまずぬれ性に優れ
ることと液相発生温度が低いこと、及び焼結条件
は第一焼結合金の焼結条件でなされるためこの条
件での強度を必要とする。従つて具体的には重量
％でC1.0〜4.5％、（Ｐ，Ｂ，Si）のうち一種又は
二種以上を合計で1.0〜5.0％、Cu1.5〜5.0％、残
実質的なFeよりなる焼結合金が望ましい。Ｃ量
は基地組織のフエライト化を防ぐため1.0％以上、
逆に過剰なセメンタイト発生を防ぐため4.5％以
下で選択され、（Ｐ，Ｂ，Si）は少量添加で液相
発生温度を下げる効果を有するが1.0％末満でそ
の効果に不足し、5.0％超では脆化が著しい。又
Cuも液相発生温度を下げる効果を有するが、ぬ
れ性の向上と焼結収縮率の調整のため添加され、
1.0％末満であると効果がなく、5.0％以上では脆
化が著しい。さらに基地強度を向上する目的で
（Ni，Cr，Mo）のうち一種又は二種以上を0.5〜
2.0％添加することも可能である。 Such a second sintered alloy must first have excellent wettability and a low liquid phase generation temperature, and since the sintering conditions are the same as those for the first sintered alloy, it must have strength under these conditions. . Therefore, specifically, C1.0 to 4.5% by weight, one or more of (P, B, Si) 1.0 to 5.0% in total, Cu 1.5 to 5.0%, and the remaining substantial Fe A sintered alloy consisting of: The amount of C is 1.0% or more to prevent the formation of ferrite in the base structure.
On the other hand, to prevent excessive cementite generation, it is selected at 4.5% or less, and (P, B, Si) has the effect of lowering the liquid phase generation temperature when added in small amounts, but this effect is insufficient at less than 1.0%, and 5.0% At ultra-high temperatures, embrittlement is significant. or
Cu also has the effect of lowering the liquid phase generation temperature, but it is added to improve wettability and adjust the sintering shrinkage rate.
If it is less than 1.0%, it is ineffective, and if it is more than 5.0%, it becomes brittle. Furthermore, for the purpose of improving base strength, one or more of (Ni, Cr, Mo) is added at 0.5~
It is also possible to add 2.0%.
一方第一焼結合金材は本出願人の先に提案した
特開昭54−62108号の如き、重量％でC0.5〜4.0
％、Cr8.0〜30.0％、（Ｐ，Ｂ，Si）のうち一種又
は二種以上0.1〜5.0％、Mo20％以下含む液相焼
結合金が適する。かかる第一焼結合金は1240℃付
近で液相を生じ約６％近く収縮するが、前記第二
焼結合金は1220℃付近で液相を生じる。 On the other hand, the first sintered alloy material has a C0.5 to 4.0% by weight as disclosed in Japanese Patent Application Laid-open No. 54-62108 previously proposed by the present applicant.
%, Cr8.0-30.0%, one or more of (P, B, Si) 0.1-5.0%, Mo 20% or less is suitable. The first sintered alloy forms a liquid phase at around 1240°C and shrinks by about 6%, while the second sintered alloy forms a liquid phase at around 1220°C.
この第一焼結合金と第二焼結合金は別々に圧粉
成形されても良いが、好ましくは第３図の如く一
体として成形される。まず第３図イに示すように
ダイＢ、第二パンチＤ、コアロツドＦを上げ第一
焼結合金の粉末Ｊを充填する。これは第一パンチ
Ｃを降下することによつても達成されるが、一般
にプレス機械のプレス下パンチは固定されて基台
に支承されるため以下は下パンチ固定として説明
する。 Although the first sintered alloy and the second sintered alloy may be powder-molded separately, they are preferably molded as one body as shown in FIG. First, as shown in FIG. 3A, the die B, second punch D, and core rod F are raised and filled with powder J of the first sintered alloy. This can also be achieved by lowering the first punch C, but since the lower punch of a press machine is generally fixed and supported on a base, the following explanation will be given as the lower punch being fixed.
次に第３図ロに示す如く第一上パンチＧを降下
するとともにダイＢ、第二下パンチＤ、コアロツ
ドＦを第一上パンチＧの降下量の約半分ほど下降
させる。従つて粉末Ｊは相対的には第一上パンチ
Ｇと下パンチＣとにより両方から圧縮されること
となり、圧縮方向に均一な密度の圧粉体が得られ
る。尚第二下パンチＤは第３図イではシリンダに
より上昇されており第３図ロに示す如く第一上パ
ンチＧより位相をずらせて降下される第二上パン
チＨにより下降される。 Next, as shown in FIG. 3B, the first upper punch G is lowered, and the die B, second lower punch D, and core rod F are lowered by about half the amount that the first upper punch G is lowered. Therefore, the powder J is relatively compressed from both the first upper punch G and the lower punch C, and a green compact having a uniform density in the compression direction is obtained. The second lower punch D is raised by the cylinder in FIG. 3A, and is lowered by the second upper punch H, which is lowered with a phase shift from the first upper punch G, as shown in FIG. 3B.
次に第３図ハに示す如く第一下パンチＣをシリ
ンダにより上昇させると共にコアロツドＦ、ダイ
Ｂを上昇させ粉末ＪとダイＢの上面を同一高さに
する。一方第二下パンチＤをシリンダにより下降
すると同時に第二焼結合金の粉末Ｋを充填する。
このように粉末Ｋを吸い込み充填することが望ま
しいが、第二下パンチＤは第３図ロの状態からさ
らに第二上パンチＨによりある程度下げられてい
るためこの位置から下げることによつて粉末Ｋを
充填しても良い。 Next, as shown in FIG. 3C, the first lower punch C is raised by the cylinder, and the core rod F and die B are also raised so that the upper surfaces of the powder J and the die B are at the same height. On the other hand, the second lower punch D is lowered by the cylinder and at the same time, the second sintered alloy powder K is filled.
It is desirable to suck and fill the powder K in this way, but since the second lower punch D has been lowered to a certain extent by the second upper punch H from the state shown in Figure 3B, by lowering it from this position, the powder K can be filled. You may also fill it with
次に第３図ニに示す如く第二下パンチＤはその
ままで第一下パンチＣ及び粉末Ｊを第一上パンチ
Ｇにより下降する。この場合に第一下パンチＣは
シリンダにより浮動されており第一上下パンチ
Ｇ，Ｃにより粉末Ｊが圧縮されることはない。第
３図ニの状態から第一上パンチＧより位相差分遅
れた第二上パンチＨが粉末Ｋの圧縮を開始すると
同時にダイＢ、コアロツドＦ、を同速度で下降す
る。従つて第一第二上パンチ、ダイ、第一下パン
チが同速度で下降することとなり粉末Ｋは相対的
に第二下パンチＤにより圧粉される。次に第一上
パンチＧの下降限時にダイ、コアロツドの移動を
止め第二上パンチＨのみで圧粉成形し、第３図ホ
の状態となる。かかる圧粉成形によつて粉末Ｋは
上下方向から同量圧粉され均一な密度が得られ
る。次いで第３図ヘに示す如く第一、第二上パン
チを上昇し、ダイＢ、コアロツドＦをひき下げて
成形圧粉体Ｌを取り出す。 Next, as shown in FIG. 3D, the first lower punch C and the powder J are lowered by the first upper punch G while the second lower punch D remains as it is. In this case, the first lower punch C is floated by the cylinder, and the powder J is not compressed by the first upper and lower punches G and C. From the state shown in FIG. 3D, the second upper punch H, which is delayed by a phase difference from the first upper punch G, starts compressing the powder K, and at the same time, the die B and core rod F are lowered at the same speed. Therefore, the first and second upper punches, the die, and the first lower punch descend at the same speed, and the powder K is relatively compacted by the second lower punch D. Next, when the first upper punch G reaches its lowering limit, the movement of the die and core rod is stopped, and powder compaction is performed using only the second upper punch H, resulting in the state shown in FIG. 3E. By this compaction, the powder K is compacted in the same amount from above and below, and a uniform density is obtained. Next, as shown in FIG. 3, the first and second upper punches are raised, and the die B and core rod F are lowered to take out the compacted powder body L.
かかる製造方法によれば肉厚が薄くかつ圧縮方
向が比較的高い二種の材料による圧粉体も容易に
形成されるものであり、さらに圧粉成形時には第
一第二下パンチが最下降位置で基台により支承さ
れ、上パンチも一つのクランクで位相をずらせた
２つの上パンチを設けることのみでよいため、機
構的構造的な無理がない。 According to this manufacturing method, a green compact made of two materials with a thin wall thickness and a relatively high compression direction can be easily formed, and furthermore, during compaction, the first and second lower punches are in the lowest position. Since it is only necessary to provide two upper punches that are shifted in phase by one crank, there is no mechanical structural unreasonableness.
以上記した本発明カムシヤフトはカムロブを第
一、第二焼結合金材とスリーブにより形成したこ
とによつて耐摩耗性、強度及び結合強度に優れる
ばかりか、焼結はカムロブのみが行なわれるため
生産能率の高いものである。 The camshaft of the present invention described above not only has excellent wear resistance, strength, and bonding strength because the cam lobe is formed from the first and second sintered alloy materials and the sleeve, but also has excellent wear resistance, strength, and bonding strength. It is highly efficient.
尚第二焼結合金はその主たる効果が第一焼結合
金とスリーブとの結合力の向上にあるが、添加元
素が多く高価である第一焼結合金の量を低減し、
経済的な効果もあげうるものであるが、第一第二
焼結合金の配分はそれぞれが圧粉成形できる限界
で決定され、通常0.5mm以上の肉厚が必要である。 The main effect of the second sintered alloy is to improve the bonding strength between the first sintered alloy and the sleeve.
Although it can have an economical effect, the distribution of the first and second sintered alloys is determined by the limit that each can be compacted, and usually requires a wall thickness of 0.5 mm or more.
さらに通常のカムシヤフトで設けられる油穴や
ギア、カムロブ、ジヤーナルの回り止めピン等を
設けることはいうまでもない。 It goes without saying that oil holes, gears, cam lobes, journal stopper pins, etc., which are provided in a normal camshaft, are also provided.
第１図：本発明のカムシヤフトの実施例断面
図。第２図：第１図Ａ−Ａ断面図。第３図イ〜
へ：本発明の製造を示す断面図。
付号の説明、１……ステム、２……スリーブ、
３……カムロブ、４……第一焼結合金材、５……
第二焼結合金材。
FIG. 1: A sectional view of an embodiment of the camshaft of the present invention. Figure 2: Cross-sectional view taken along line A-A in Figure 1. Figure 3 I
To: A sectional view showing the manufacturing of the present invention. Explanation of numbers, 1...Stem, 2...Sleeve,
3... Cam lob, 4... First sintered alloy material, 5...
Second sintered alloy material.
Claims (1)
カムロブ３によりなるカムシヤフトにおいて、該
カムロブ３が外周側に第一焼結合金材４を配し内
周側に鋼製スリーブ２を配し、該鋼製スリーブ２
と第一焼結合金材４間に第二焼結合金材５を配し
てカムロブ３を形成し、前記スリーブ２とステム
１を結合して形成されるカムシヤフト。 ２ 前記第一焼結合金材が液相焼結合金であり前
記第二焼結合金材は液相発生温度が相対的に低い
液相焼結合金であり、前記スリーブ２と第一焼結
合金材４、第二焼結合金材５とが焼結収縮及び拡
散により結合されてなることを特徴とする前記特
許請求の範囲第一項記載のカムシヤフト。[Scope of Claims] 1. A camshaft consisting of a stem 1 made of a steel pipe and a cam lobe 3 made of a sintered metal, in which the cam lobe 3 has a first sintered metal material 4 arranged on its outer circumference and a steel sleeve on its inner circumference. 2, and the steel sleeve 2
A camshaft is formed by disposing a second sintered metal material 5 between a first sintered metal material 4 to form a cam lobe 3, and joining the sleeve 2 and stem 1. 2. The first sintered alloy material is a liquid phase sintered alloy, the second sintered alloy material is a liquid phase sintered alloy with a relatively low liquid phase generation temperature, and the sleeve 2 and the first sintered alloy The camshaft according to claim 1, wherein the material 4 and the second sintered alloy material 5 are bonded together by sintering shrinkage and diffusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13843081A JPS5841211A (en) | 1981-09-04 | 1981-09-04 | Cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13843081A JPS5841211A (en) | 1981-09-04 | 1981-09-04 | Cam shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5841211A JPS5841211A (en) | 1983-03-10 |
| JPH024763B2 true JPH024763B2 (en) | 1990-01-30 |
Family
ID=15221781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13843081A Granted JPS5841211A (en) | 1981-09-04 | 1981-09-04 | Cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5841211A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033303A (en) * | 1983-08-03 | 1985-02-20 | Nippon Piston Ring Co Ltd | Preparation of cam shaft |
| JPS6043405A (en) * | 1983-08-18 | 1985-03-08 | Mitsubishi Metal Corp | Production of cam shaft consisting of sintered alloy |
| JPS6044659A (en) * | 1983-08-18 | 1985-03-09 | Mitsubishi Metal Corp | Cam shaft |
| JPS6056856U (en) * | 1983-09-28 | 1985-04-20 | 日本ピストンリング株式会社 | camshaft |
| JPS60114359U (en) * | 1984-01-12 | 1985-08-02 | 日本ピストンリング株式会社 | camshaft |
| JPS60121553U (en) * | 1984-01-25 | 1985-08-16 | 日本ピストンリング株式会社 | assembly camshaft |
| JPS60149556U (en) * | 1984-03-16 | 1985-10-04 | 日本ピストンリング株式会社 | assembly camshaft |
| JPH0610286B2 (en) * | 1988-03-17 | 1994-02-09 | 日本ピストンリング株式会社 | Camshaft manufacturing method |
| AT395688B (en) * | 1991-02-13 | 1993-02-25 | Miba Sintermetall Ag | METHOD FOR PRODUCING A MOLDED PART BY SINTERING |
-
1981
- 1981-09-04 JP JP13843081A patent/JPS5841211A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5841211A (en) | 1983-03-10 |
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