JPS60532B2 - Molding method of pipe type camshaft - Google Patents
Molding method of pipe type camshaftInfo
- Publication number
- JPS60532B2 JPS60532B2 JP56168355A JP16835581A JPS60532B2 JP S60532 B2 JPS60532 B2 JP S60532B2 JP 56168355 A JP56168355 A JP 56168355A JP 16835581 A JP16835581 A JP 16835581A JP S60532 B2 JPS60532 B2 JP S60532B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- steel pipe
- pipe
- metal pipe
- type camshaft
- 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
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)
- Gears, Cams (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
【発明の詳細な説明】
この発明は内燃機関用のパイプ式カムシャフトの成形方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a pipe-type camshaft for an internal combustion engine.
従来のパイプ式カムシヤフトとして、例えば第１図に示
すようなものがある。As a conventional pipe type camshaft, there is one shown in FIG. 1, for example.
これは軸となる鋼パイプ１にカム２、ジャーナル３およ
び力ムスプロケット取付用のフランジ４を挿入し、バル
ジ加工により前記鋼パイプ１内に油圧を掛け、これら各
部品を固定したものからなる。また、カム２、ジャーナ
ル３、フランジ４の回転防止のため、これらの各取付孔
に凸部や凹部を予め形成しておき「鋼パイプ１の一部が
これらの凸部、凹部に喰い込むように入り込ませてある
。第２図はこの一例を示したものである。This consists of a cam 2, a journal 3, and a flange 4 for attaching a force sprocket inserted into a steel pipe 1 serving as a shaft, and by applying hydraulic pressure inside the steel pipe 1 by bulging, these parts are fixed. In order to prevent the cam 2, journal 3, and flange 4 from rotating, protrusions and recesses are formed in each of these mounting holes in advance so that a portion of the steel pipe 1 will fit into these protrusions and recesses. Figure 2 shows an example of this.
これは丸鋼パイプ１に角を丸めた取付孔松を有するカム
２を挿通し、このカム２をバルジ加工用金型５，６間に
介在して加圧時にカム２が破壊しないように保持する構
造となっており、鋼パイプ１内に油圧をかけてこれを拡
張し、その一部を前記取付孔後の隅々まで張り出させて
なる。なお、前記ジャーナル３やフランジ４についても
同様の取り付けができる。（例えば実開昭５２一４６１
４１号公報）しかしながら、かかる従来のパイプ式カム
シャフトの成形方法にあっては、例えばカム２などの材
料として伸びの小さい鋳鉄、暁結合金またはセラミック
などを使用する際に、カム２の加工誤差分だけ金型５，
６を余裕をもって大きくしているため、第２図のように
カム２と金型５，６との間に隙間７が生じることになっ
ていた。このため、この隙間７があることにより、バル
ジ成形時にカム２に許容応力以上の力が作用し、このカ
ム２が破損するという問題があった。また、カム２を前
記隙間７が生じないようにするには、カム２および金型
５，６の寸法精度を厳しくする必要があり、コストの増
大に継がるという実用上の問題があった。本発明はかか
る従釆の問題点に着目して成されたものであり、金属パ
イプおよびこれに挿入するカム等の都材の一方または双
方に、凹部または凸部からなる回転防止部を設け、かつ
これらの間に応力緩衝材を介在させて、金属パイプ内を
バルジ加工によって加圧することにより、前記部材の破
損を防止し、かつ金型などの寸法精度を比較的ラフにで
きるパイプ式カムシャフトの成形方法を提供するもので
ある。This involves inserting a cam 2 having a mounting hole with rounded corners into a round steel pipe 1, and interposing this cam 2 between bulging molds 5 and 6 to hold the cam 2 so that it does not break when pressurized. The structure is such that hydraulic pressure is applied to the inside of the steel pipe 1 to expand it, and a part of it extends to every corner behind the mounting hole. Note that the journal 3 and flange 4 can also be attached in the same manner. (For example, Utility Model No. 52-461
However, in such a conventional method for forming a pipe-type camshaft, when a material such as cast iron, Akatsuki alloy, or ceramic with low elongation is used for the cam 2, machining errors of the cam 2 may occur. Minute mold 5,
6 was enlarged with a margin, a gap 7 was created between the cam 2 and the molds 5 and 6 as shown in FIG. Therefore, due to the gap 7, a force exceeding the allowable stress is applied to the cam 2 during bulge forming, resulting in a problem that the cam 2 is damaged. Further, in order to prevent the gap 7 from occurring in the cam 2, it is necessary to tighten the dimensional accuracy of the cam 2 and the molds 5 and 6, which leads to a practical problem of increased costs. The present invention has been made by focusing on the problem of such a secondary structure, and includes providing a rotation prevention portion consisting of a concave portion or a convex portion on one or both of a metal pipe and a capital material such as a cam inserted into the metal pipe, A pipe-type camshaft that prevents breakage of the members and makes the dimensional accuracy of the mold relatively rough by interposing a stress buffer material between them and pressurizing the inside of the metal pipe by bulge processing. This provides a molding method.
以下に「本発明の実施例を図面について具体的に説明す
る。Embodiments of the present invention will be specifically described below with reference to the drawings.
第３図は前述したものと同様のカム２の側面図であり、
このカム２の取付孔２内周面には、等間隔に回転防止手
段としての３個の凸部かが突設されている。FIG. 3 is a side view of the cam 2 similar to the one described above,
The inner peripheral surface of the mounting hole 2 of the cam 2 is provided with three protrusions protruding from it at equal intervals as rotation prevention means.
一方、このカム２を挿入する鋼／ぐィプーには、第４図
に示すように、前記凸部沙に対応する位置にト回転防止
手段としての凹部ｌａがその長手方向に形成されている
。なお、この凹部ｌａは鋼パィプーの全長に亘つて設け
ても良いが、カム２の取付部位のみに設けることもでき
る。次に、前記と同様の金型５，６に第３図に示すカム
２を介装し、さらにこれの取付孔ね内に第４図に示すパ
イプ１を第５図に示すように挿入する。このとき前記凸
部２ｂと凹部ｌａとを対応させる。また、ここで重要な
ことは前記取付孔かと鋼パィプーとの間に、第６図に示
す如きパイプ状の緩衝部材８を介在させた点であり、こ
の緩衝部材８は発泡金属のようにある程度の剛性を有す
る可操性部材からなる。この状態を第５図に示す。続い
て鋼パイプ１内に油圧を掛け、バルジ作業に入る。する
と、前記鋼パイプ１は拡張張して、カム２の凸部２ｂと
鋼／ぐィプーの凹部ｌａとが緩衝部材２を介して圧合す
ることとなる。あお、図示しないが、前記ジャーナル３
やフランジ４の取り付けにも同様の方法が採用される。
このように、鋼パイプーとカム２との間に緩衝部材８を
介在させることによって、バルジ成形時にカム２に対し
局部的に高応力部分が存在することがなくなり、たとえ
カム２と金型５，６との間に隙間７が存在することがあ
っても、そのカム２を破損に至らしめることは完全にな
くなる。On the other hand, as shown in FIG. 4, the steel/guipoo into which this cam 2 is inserted has a recess la formed in its longitudinal direction as a rotation prevention means at a position corresponding to the protrusion sha. Note that the recess la may be provided over the entire length of the steel pipe, but it may also be provided only at the attachment site of the cam 2. Next, the cam 2 shown in FIG. 3 is inserted into the same molds 5 and 6 as described above, and the pipe 1 shown in FIG. 4 is inserted into the mounting hole of the cam 2 as shown in FIG. 5. . At this time, the convex portion 2b and the concave portion la are made to correspond to each other. Also, what is important here is that a pipe-shaped buffer member 8 as shown in FIG. It consists of a movable member with a rigidity of . This state is shown in FIG. Next, hydraulic pressure is applied inside the steel pipe 1 and bulge work begins. Then, the steel pipe 1 is expanded and tensioned, and the convex portion 2b of the cam 2 and the concave portion la of the steel/guipure are pressed together via the buffer member 2. Ao, although not shown, the journal 3
A similar method is also adopted for attaching the flange 4 and the flange 4.
In this way, by interposing the buffer member 8 between the steel pipe and the cam 2, there will be no locally high stress area on the cam 2 during bulge forming, and even if the cam 2 and the mold 5, Even if there is a gap 7 between the cam 2 and the cam 2, the cam 2 is completely prevented from being damaged.
かくして」カム２や金型５，６の寸法精度もラフにでき
る。また、カム２に鋼パイプ１を密着させるには、鋼パ
イプ１のスプリングバックを見込んで大き目に拡張する
必要があり、このときカム２は袷んど弾性変形しないた
めに許容応力を越えてしまうのであるが、前記のように
緩衝部材８を介在することによって、これが弾性変形し
、カム２は、許容応力を越えずにＬ カム２と弾性部材
８と鋼パイプ１とを密舷することができる。In this way, the dimensional accuracy of the cam 2 and the molds 5 and 6 can be made rough. In addition, in order to bring the steel pipe 1 into close contact with the cam 2, it is necessary to expand the steel pipe 1 to a large extent in anticipation of springback, and at this time, the cam 2 does not undergo elastic deformation, so the stress exceeds the allowable stress. However, as mentioned above, by interposing the buffer member 8, this is elastically deformed, and the cam 2 is able to make the L cam 2, the elastic member 8, and the steel pipe 1 close together without exceeding the allowable stress. can.
この場合において、緩衝部村８があることによってカム
２と鋼／ぐィプーとの固定が不充分となるのを防ぐため
、緩衝部材８の剛性、凸部沙や凹部ｌａの深さを適当に
選定する必要がある。In this case, in order to prevent insufficient fixation between the cam 2 and the steel/guip due to the presence of the buffer member 8, the rigidity of the buffer member 8 and the depth of the convex portion and recess portion la should be adjusted appropriately. It is necessary to select.
第７図および第８図はカム２および鋼パイプ１の他の実
施例を示す側面図で、カム２の取付孔ゑ内周には回転防
止手段としての多数の歯９が形成され、鋼／ぐィプーは
多数の連続屈曲面１０が形成されている。かかるカム２
および鋼パイプーによれば、これらの間に緩衝部材８を
介して鋼／ｆィプー内を加圧することにより、これらカ
ム２および鋼／ぐィプーの緩衝部材８に対する喰込みが
良くなるとともに、前記同様の効果が得られる。第９図
はカム２の取付孔彼にのみ凹部１１を設けたもので、鋼
パイプ１には第２図に示すものと同様の丸鋼パイプ２を
使用し、バルジ加工によって第１０図に示す如く緩衝部
村８を介して鋼パイプ１とカム２とを結合したものであ
る。7 and 8 are side views showing other embodiments of the cam 2 and the steel pipe 1, in which a large number of teeth 9 are formed on the inner periphery of the mounting hole of the cam 2 as rotation prevention means, and the steel pipe 1 is Guipoo has a large number of continuous curved surfaces 10 formed therein. Cam 2
According to the cam 2 and the steel pipe, by pressurizing the inside of the steel pipe through the buffer member 8, the biting of the cam 2 and the steel pipe into the buffer member 8 becomes better, and as described above, The effect of this can be obtained. In Fig. 9, a recess 11 is provided only in the mounting hole of the cam 2, and a round steel pipe 2 similar to that shown in Fig. 2 is used as the steel pipe 1, and the same as shown in Fig. 10 is formed by bulge processing. In this structure, a steel pipe 1 and a cam 2 are connected via a buffer section 8.
このように、各実施例においてはカム２またはこれを装
着する鋼／ｆィプーの少くとも一方に、これら相互の回
転を規制する凸部または凹部を形成しておき、これらカ
ム２および鋼パイプ１を緩衝部村８を介してバルジ加工
することにより、カム２を破損することなく鋼パイプ１
に固定できる。In this way, in each embodiment, at least one of the cam 2 or the steel pipe to which it is attached is formed with a convex part or a concave part to restrict mutual rotation, and the cam 2 and the steel pipe 1 are By bulging the steel pipe 1 through the buffer village 8, the steel pipe 1 can be removed without damaging the cam 2.
It can be fixed to
なお「前記各実施例ではカム２の取り付けについて説明
したが、ジャーナル３，フランジ４その他の部材の取り
付けについても同様の方法を採用しうるはいうまでもな
い。また、前記鋼パイプ１に代えてステンレスパイプや
アルミパイプ等の金属パイプを使用することができる。
以上説明したように、本発明によれば「パイプ式カムシ
ャフトを、金属パイプおよびこの金属パイプに挿入する
カム等の部村の一方または双方に、凹部または凸部の回
転防止部を設け、かつこれら金属パイプおよび都材間に
応力緩衝材を介在させて、バルジ加工により金属パイプ
を拡張させて形成したことにより、バルジ加工用金型と
部材との間に隙間が生じていても、その都材が変形した
り破壊されたりすることがなくなり、しかも金型や部村
の寸法精度を粗くでき、カムシャフトの製作コストの大
幅ダウンを図れる等の効果が得られる。In addition, although the installation of the cam 2 has been explained in each of the above embodiments, it goes without saying that the same method can be adopted for the installation of the journal 3, flange 4, and other members.Also, in place of the steel pipe 1, Metal pipes such as stainless steel pipes and aluminum pipes can be used.
As explained above, according to the present invention, ``a pipe-type camshaft is provided with a rotation preventing portion such as a concave portion or a convex portion on one or both of a metal pipe and a portion such as a cam inserted into the metal pipe, and By interposing stress buffering material between these metal pipes and the material and expanding the metal pipe through bulge processing, even if there is a gap between the bulge processing mold and the member, the The material will not be deformed or destroyed, and the dimensional accuracy of the molds and parts can be made rougher, resulting in a significant reduction in the manufacturing cost of the camshaft.
第１図は従来のパイプ式カムシャフトの一部切断正面図
、第２図は第１図のカムシャフトのバルジ加工説明図、
第３図は本発明で使用するカムの側面図、第４図は同じ
く鋼パイプの側面図、第５図は本発明のバルジ加工説明
図「第６図は緩衝部材の側面図、第７図はカムの他の実
施例を示す側面図、第８図は鋼パイプの他の実施例を示
す側面図、第９図はカムのさらに他の実施例を示す側面
図、第１０図はそのカムと鋼パイプとの結合状態を示す
側面図である。
１・・・・・・金属パイプ「 ２・・・・・・カム、５
，６・・・・・・金型、８・・…・緩衝部材トｌａ，２
ｂ，９，１０・…・・回転防止部。
第１図
第２図
第５図
第３図
第４図
第６図
第７図
第８図
第９図
第１０図Figure 1 is a partially cutaway front view of a conventional pipe-type camshaft, Figure 2 is an explanatory diagram of the bulge machining of the camshaft in Figure 1,
Fig. 3 is a side view of the cam used in the present invention, Fig. 4 is a side view of the steel pipe, Fig. 5 is an explanatory diagram of the bulge processing of the present invention, Fig. 6 is a side view of the buffer member, Fig. 7 8 is a side view showing another embodiment of the cam, FIG. 8 is a side view showing another embodiment of the steel pipe, FIG. 9 is a side view showing still another embodiment of the cam, and FIG. 10 is the cam. It is a side view showing a state of connection between the metal pipe and the steel pipe.
, 6...Mold, 8...Buffer member tola, 2
b, 9, 10... Rotation prevention part. Figure 1 Figure 2 Figure 5 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10
Claims (1)
どの部材の一方または両方に、凹部や凸部の回転防止部
を形成するとともに、少くともこの回転防止部を含む前
記金属パイプおよび部材間に応力緩衝材を介在し、続い
てバルジ加工により金属パイプを拡張して該金属パイプ
と部材とを固定するようにしたことを特徴とするパイプ
式カムシヤフトの成形方法。1. Forming a rotation preventing portion such as a concave or convex portion on one or both of the metal pipe and a member such as a cam attached to the metal pipe, and creating a stress buffer between the metal pipe and the member including at least the rotation preventing portion. A method for forming a pipe-type camshaft, characterized in that the metal pipe and the member are fixed by interposing a metal pipe and subsequently expanding the metal pipe by bulge processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56168355A JPS60532B2 (en) | 1981-10-21 | 1981-10-21 | Molding method of pipe type camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56168355A JPS60532B2 (en) | 1981-10-21 | 1981-10-21 | Molding method of pipe type camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5870011A JPS5870011A (en) | 1983-04-26 |
| JPS60532B2 true JPS60532B2 (en) | 1985-01-08 |
Family
ID=15866531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56168355A Expired JPS60532B2 (en) | 1981-10-21 | 1981-10-21 | Molding method of pipe type camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60532B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151459A (en) * | 1984-01-19 | 1985-08-09 | Riken Corp | Cam roller and cam shaft |
| JPS60157560A (en) * | 1984-01-28 | 1985-08-17 | Riken Corp | Cam and camshaft |
| JPS61182827A (en) * | 1985-02-07 | 1986-08-15 | Musashi Seimitsu Kogyo Kk | Assembly cam shaft |
| CA1290596C (en) * | 1987-03-09 | 1991-10-15 | Philip D. Arnold | Tubular camshaft assemblies, method and apparatus |
| JP2719487B2 (en) * | 1993-06-02 | 1998-02-25 | 松本重工業株式会社 | Method of manufacturing camshaft |
| FR3018104B1 (en) * | 2014-03-01 | 2016-03-25 | Ntn Snr Roulements | METHOD FOR ASSEMBLING A CAMSHAFT |
-
1981
- 1981-10-21 JP JP56168355A patent/JPS60532B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5870011A (en) | 1983-04-26 |
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