JP4234953B2 - Composite camshaft and manufacturing method thereof - Google Patents

Composite camshaft and manufacturing method thereof Download PDF

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Publication number
JP4234953B2
JP4234953B2 JP2002165540A JP2002165540A JP4234953B2 JP 4234953 B2 JP4234953 B2 JP 4234953B2 JP 2002165540 A JP2002165540 A JP 2002165540A JP 2002165540 A JP2002165540 A JP 2002165540A JP 4234953 B2 JP4234953 B2 JP 4234953B2
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Japan
Prior art keywords
tube
shaft
shaft tube
insertion hole
rotating member
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JP2002165540A
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JP2004011743A (en
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光功 寺村
仁 柘植
保 山本
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Otics Corp
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Otics Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、中空の軸管に、回転部材を嵌合して固着してなる複合カムシャフトに関し、特に回転部材の取付構造を改良したものに関する。
【0002】
【従来の技術】
従来、軸管に、カム管やジャーナル管などの回転部材を固着する手法としては、例えば特開平6−341304号公報に示されるものがある。これは、中空の軸管が、カム管に設けられた軸挿通孔に挿入された状態で、軸管内に圧入したマンドレルにより軸管を外側に展延させることによって、カム管の軸挿通孔内周壁に設けられた溝に軸管を食い込ませてカム管に圧着するものである。
【0003】
【発明が解決しようとする課題】
しかしながら上述の手法では、軸管が外側に展延される際に、軸管のみならず、カム管に対しても軸挿通孔の内壁を通して外側方向に力が加わる結果、カム管の外周部に形成されているプロフィール面が変形することがあった。このため、軸管にカム管を固着した後に、一旦形成したプロフィール面に対して改めて研磨加工を施さなければならないという問題点があった。
【0004】
本発明は上記のような事情に基づいて完成されたものであって、その目的は、軸管に回転部材を固着した後に摺動面に対して施される研磨加工を省略することにより、製造工程における作業負担の軽減された複合カムシャフト、及びその製造方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記の目的を達成するための手段として、請求項1の発明は、中空の軸管に、その軸管を挿通させる軸挿通孔が設けられた回転部材を嵌合して固着してなる複合カムシャフトであって、前記回転部材は、その外周部に相手部材に対する摺動面を備えた本体と、この本体から前記軸管の軸方向に延出された筒状の取付筒部とを備え、前記回転部材のうち前記本体部分の軸挿通孔の内径は前記取付筒部の軸挿通孔の内径よりも径大に形成されており、前記軸管が前記軸挿通孔に挿入された状態で前記軸管内に圧入したマンドレルにより前記軸管が外側に展延されることによって前記取付筒部に圧着されており、前記取付筒部の軸挿通孔の内周壁には、前記軸管の軸方向に延びるキー溝が形成されており、前記マンドレルにより外側に展延された軸管がそのキー溝に食い込んでおり、前記取付筒部の軸挿通孔の内周部及び前記軸管の外周部には、いずれか一方に位置決め突起が形成され、、他方には、前記軸管の軸方向に延びると共に、前記回転部材の軸挿通孔に前記軸管を挿入する際に前記位置決め突起と係合する位置決め溝が設けられていることを特徴とする
【0008】
請求項の発明は、中空の軸管に、その軸管を挿通させる軸挿通孔が設けられた複数個の回転部材を嵌合して固着してなる複合カムシャフトを製造する方法であって、前記回転部材は、その外周部に相手部材に対する摺動面を備えた本体と、この本体から軸方向に延出された筒状の取付筒部とを備えると共に前記回転部材のうち前記本体部分の軸挿通孔の内径は前記取付筒部の軸挿通孔の内径よりも径大に形成されており、前記回転部材の軸挿通孔に前記軸管を挿入し、前記回転部材の前記取付筒部が隣の回転部材に直接に接触する状態となした上で、前記軸管内にマンドレルを圧入して前記軸管を外側に展延することによって前記軸管を前記回転部材の前記取付筒部に圧着することを特徴とする
【0010】
【発明の作用及び効果】
<請求項1、の発明>
請求項1、の発明によれば、回転部材と軸管とは、回転部材に設けられた取付筒部において固着される。このため、軸管を展延させるために加えられる力は取付筒部に伝えられるのみで、本体に対しては摺動面を変形させるような力が加わらないので、摺動面が変形することが防止される。この結果、軸管に回転部材を固着した後に摺動面に対して施される研磨加工を省略できるので、製造工程における作業負担が軽減される。
【0011】
また、取付筒部の長さ及び厚さは比較的自由に設計できるので、従来のように、回転部材本体と、軸管とを固着する場合と比べて、軸管と回転部材との固着強度を大きくすることができる。
【0012】
また、取付筒部の軸挿通孔の内周壁に形成された、軸管の軸方向に延びるキー溝に、マンドレルにより外側に展延された軸管が食い込むことにより、軸管と回転部材とを、強固に固着することができる。
【0013】
また、取付筒部の軸挿通孔の内周部及び軸管の外周部に、いずれか一方に位置決め突起が形成され、他方には軸管の軸方向に延びて位置決め突起と嵌合する位置決め溝が設けられていることにより、回転部材を軸管に固着する際に、軸管に対する周方向への位置決めを、位置決め突起と位置決め溝とを係合させることにより行うことができる。この結果、回転部材相互の相対的配置を簡便に決定できるので、製造工程における作業負担を軽減することができる。
【0014】
また、回転部材の取付筒部が隣の回転部材に直接に又はスペーサを介して接触する状態で回転部材と軸管とが固着された複合カムシャフトを製造することができる。このため、従来は回転部材本体同士の取付間隔を専用の間隔調整用工具を用いて調整していたのに対し、取付筒部を所定の長さに調節することにより、間隔調整用工具を使用することなく回転部材本体同士の間隔を調節することができる。この結果、製造工程における作業負担を軽減することができる。
【0016】
【発明の実施の形態】
以下、本発明の実施形態を添付図面に基づいて説明する。
参考例1
参考例1について、図1ないし図7を参照して説明する。
参考例の複合カムシャフト10は、中空の軸管20に、回転部材としてのカム管30が固着されてなる(図1参照)。
【0017】
カム管30は、本体31と、その両側に位置する一対の取付筒部32とからなる。本体31は、断面が略卵形をした板状をしており、その外周面には、図示しないロッカーアームと摺動するプロフィール面(摺動面に対応する)が形成されている。また、本体31には軸管20を挿通可能な軸挿通孔33が形成されている。
【0018】
取付筒部32は、本体31の軸挿通孔33と連続するようにしてその左右両側に軸方向に延びており、その内周面が軸挿通孔34を形成する。ここで、取付筒部32の軸挿通孔34の内径d2は、本体31の軸挿通孔33の内径d1よりも小さい(図4参照)。取付筒部32の軸挿通孔34の内周面には、軸方向に沿って4本のキー溝35が一定の間隔に形成されており、ここに、軸管20に形成された突部21が食い込んでいる(図3参照)。
【0019】
次に、カム管30を軸管20に固着する方法について説明する。
まず、カム管30の軸挿通孔33、34に軸管20を通した後(図4、図5、図6参照)、この状態のまま、棒状のマンドレル40を軸管20に圧入する(図7参照)。マンドレル40の外周部には、取付筒部32に設けられたキー溝35に対応する位置に計4個のスプライン形状の突起部41が設けられており、これらの突起部41をキー溝35に一致させた状態で軸管20に圧入する。マンドレル40の外径d3は軸管20の内径d4とほぼ一致しており、突起部41の高さは取付筒部32に設けられたキー溝35の深さよりも低い。このため、軸管20にマンドレル40を圧入すると、軸管20の外壁はマンドレル40の突起部41により展延されて突部21が形成され、取付筒部32の4本のキー溝35に突部21が食い込むことにより、カム管30と軸管20とが圧着される(図2、図3参照)。
【0020】
上記のように製造された本参考例の複合カムシャフト10によれば、カム管30に取付筒部32が設けられ、本体31の軸挿通孔33の内径d1は、取付筒部の軸挿通孔34の内径d2よりも径大である。このため、マンドレル40により軸管20を展延させるに際し、取付筒部32に対しては大きな力が加わるが、軸管20に形成された突起21は軸挿通孔33に接触せず、本体31に対して力が直接加わることはない。したがって、カム管30の本体に設けられたプロフィール面が、軸管20への固着に際して変形することがない。したがって、プロフィール面に対する、固着後の研磨処理が不要となる結果、製造工程における作業負担を軽減することができる。また、取付筒部32の長さ及び厚さは比較的自由に設計できるので、従来のように、カム管本体と軸管とを直接に固着する場合と比べて、軸管20とカム管30との固着強度を大きくすることができる。
【0021】
<第実施形態>
本発明の第実施形態について図10を用いて説明する。
実施形態は、取付筒部32に位置決め突起36が形成され、軸管20に位置決め溝22が形成された他は、基本的に参考例1と変わるところがないため、参考例1と同一部分については、同一符号を付して重複する説明を省略する。
【0022】
実施形態においては、取付筒部32に、位置決め突起36が設けられており、軸管20の外周面には、前記位置決め突起36と係合する位置決め溝22が設けられている。位置決め突起36は位置決め溝22と係合することにより、カム管30を軸管20に固着する際の、軸管20に対する周方向の位置決めとして作用する。したがって、位置決め突起36と位置決め溝22の存在により、カム管30は軸管20に対して、適正な位置で固着される。より具体的に説明すると、軸管20の軸方向に関して複数のカム管30が固着される際、それぞれのカム管30に対応する相手部材に対し、位相をずらしてカム作用を発揮させたい場合には、カム管30毎にカムノーズ37の向く姿勢を異ならせる必要がある。かかる場合、取付筒部32の内周面における位置決め突起36の位置をカム管30毎に異ならせるとともに、それぞれの位置決め突起36と対応する位置決め溝22を軸管20の周方向に関して同じ位置に設けておけばよい。
【0023】
参考例2
参考例2について図11を用いて説明する。
参考例2は、隣り合うカム管30同士が樹脂製のスペーサ60を介して接触するように、軸管20上に複数のカム管30を配置し、記述した手法により軸管20にカム管30を固着させた後、スペーサ60を取り除いたものである。
【0024】
参考例では、隣り合うカム管本体31の取付間隔Lが適正なものとなるよう取付筒部32の長さL1、L2を予め設定しておくことにより、間隔調整用工具を使用することなくカム管本体31同士を適正な間隔にすることができる。このため、製造工程における作業負担を軽減することができる。
【0025】
なお、本発明における回転部材としては、その外周面に相手部材に対する摺動面が形成されていればよく、例えばジャーナル管50にも適用することができる。よって、図11の右端に示すように、ジャーナル管本体51に、上記したカム管30と同様の態様で取付筒部52を設けても構わない。
【0026】
<他の実施形態>
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
【0027】
(1)参考例1において、取付筒部32の内周壁にキー溝35を形成したが、これに限られず、図14に示すように、取付筒部32の内周壁に平目又は綾目のローレット加工を施し、軸管20の外周部にサンドブラスト加工などの表面粗化処理を施すことによっても、第1実施形態と同様の作用効果を得ることができる。また、これと異なって、取付筒部32の内周壁にサンドブラスト加工などの表面粗面化処理を行い、軸管20の外周部に対して平目、又は綾目のローレット加工を施すことによっても、参考例1と同様の作用効果を得ることができる。更に、取付筒部32の内周壁、又は、軸管20の外周部のいずれか一方に対して、サンドブラスト加工などの表面粗面化処理、又は、平目若しくは綾目のローレット加工を施しても構わない。
【0028】
(2)参考例1において、本体31の軸挿通孔33の内径d1は、軸管20に形成された突起21が接触しない程度の大きさであるが、本体31にプロフィール面が変形しない範囲で緩く接触していても構わない。
【0029】
(3)参考例1において、取付筒部32の内周壁に等間隔に4本のキー溝35を形成したが、これに限られず、図13に示すように、取付筒部32の内周面全域に多数本のキー溝35を形成し、マンドレル40を圧入する事により軸管20に形成された突部21がいずれかのキー溝35に食い込んで取付筒部32と軸管20とを固着させてもよい。
【0030】
(4)参考例1において、取付筒部32は本体31の両側に形成されたが、これに限られず、本体31の片側だけに形成されても、参考例1と同様の作用効果を得ることができる。
【0031】
(5)参考例1において、カム管30の取付筒部32は、軸管20とカム管30とを固着する機能を果たしていたが、その外周面を加工して、取付筒部32をジャーナル軸受けとして利用することもできる。
【0032】
(6)参考例1において、マンドレル40の形態は、棒状をなし、その先端の外周部分にスプライン形状の4個の突起部41を備えた構造としたが、これに限られず、図8に示すように、その先端の外周部分に半球状の4個の突起部42を備えた構造や、図9に示すように、マンドレル40先端の外周部分にスプライン形状の4個の突起部43Aを備え、かつ、その後方に前方の突起部よりも高い、同じくスプライン形状の4個の突起部43Bを備えた構造とすることもできる。また、マンドレル40の先端の外周部分に設けられた突起部41の個数は、4個に限られない。
【0033】
(7)第実施形態においては、取付筒部32に位置決め突起36が形成され、軸管20に位置決め溝22が形成されたが、これに限られず、取付筒部32に位置決め溝が形成され、軸管20に位置決め突起が形成されていても第実施形態と同様の作用効果を得ることができる。
【0034】
(8)参考例2においては、カム管30及びジャーナル管50はスペーサ60を介して接触して軸管20に固着していたが、これに限られず、図12に示すように、隣り合う回転部材同士が直接に接触する状態で、軸管20と、カム管30又はジャーナル管50とを固着することもできる。
【図面の簡単な説明】
【図1】 参考例1における複合カムシャフトの正面図
【図2】 参考例1における複合カムシャフトの縦断面図
【図3】 第2図のA−A断面図
【図4】 参考例1における、組み付け前の状態を表すカム管、及び軸管の縦断面図
【図5】 参考例1において、軸管にカム管を嵌め込んだ状態を表す縦断面図
【図6】 図5のB−B断面図
【図7】 参考例1において、マンドレルを圧入して軸管を展延させる際の状態を表す縦断面図
【図8】 他の実施形態(5)における、マンドレルの正面図
【図9】 他の実施形態(5)における、マンドレルの正面図
【図10】 第実施形態におけるカム管及び軸管の斜視図
【図11】 参考例2において、軸管にカム管、及びジャーナル管をスペーサを介して固着させた状態を表す正面図
【図12】 参考例2において、軸管にカム管、及びジャーナル管を直接に固着させた状態を表す正面図
【図13】 他の実施形態(2)における、図3相当図
【図14】 他の実施形態(1)における、組み付け前の状態を表すカム管、及び軸管の縦断面図
【符号の説明】
10…複合カムシャフト
20…軸管
21…突部
22…位置決め溝
30…カム管
31…本体
32…取付筒部
33、34…軸挿通孔
35…キー溝
36…位置決め突起
40…マンドレル
50…ジャーナル管
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite camshaft formed by fitting and fixing a rotating member to a hollow shaft tube, and particularly to an improved mounting structure of the rotating member.
[0002]
[Prior art]
Conventionally, as a method of fixing a rotating member such as a cam tube or a journal tube to a shaft tube, for example, there is one disclosed in Japanese Patent Laid-Open No. 6-341304. This is because a hollow shaft tube is inserted into a shaft insertion hole provided in the cam tube, and the shaft tube is extended outward by a mandrel press-fitted into the shaft tube. The shaft tube is bitten into a groove provided in the peripheral wall and is crimped to the cam tube.
[0003]
[Problems to be solved by the invention]
However, in the above-described method, when the shaft tube is extended outward, force is applied not only to the shaft tube but also to the cam tube through the inner wall of the shaft insertion hole. The formed profile surface sometimes deformed. For this reason, there is a problem in that after the cam tube is fixed to the shaft tube, it is necessary to polish the profile surface once formed.
[0004]
The present invention has been completed based on the above circumstances, and its purpose is to manufacture by omitting the polishing process applied to the sliding surface after fixing the rotating member to the shaft tube. It is an object of the present invention to provide a composite camshaft with a reduced work load in the process and a manufacturing method thereof.
[0005]
[Means for Solving the Problems]
As a means for achieving the above object, the invention of claim 1 is a composite cam comprising a hollow shaft tube fitted and fixed with a rotating member provided with a shaft insertion hole through which the shaft tube is inserted. The rotating member includes a main body having a sliding surface with respect to a mating member on an outer peripheral portion thereof, and a cylindrical mounting cylinder portion extending from the main body in the axial direction of the axial tube. The inner diameter of the shaft insertion hole of the main body portion of the rotating member is formed larger than the inner diameter of the shaft insertion hole of the mounting cylinder portion, and the shaft tube is inserted into the shaft insertion hole in the state described above. The shaft tube is crimped to the mounting tube portion by being extended outward by a mandrel press-fitted into the shaft tube, and the inner peripheral wall of the shaft insertion hole of the mounting tube portion is arranged in the axial direction of the shaft tube. A shaft formed with an extending keyway and extended outward by the mandrel Biting into the key groove, and a positioning projection is formed on one of the inner peripheral portion of the shaft insertion hole of the mounting tube portion and the outer peripheral portion of the shaft tube, and on the other side, A positioning groove is provided which extends in the axial direction and engages with the positioning protrusion when the shaft tube is inserted into the shaft insertion hole of the rotating member .
[0008]
The invention of claim 2 is a method of manufacturing a composite camshaft formed by fitting and fixing a plurality of rotating members provided with shaft insertion holes through which a shaft tube is inserted into a hollow shaft tube. The rotating member includes a main body having a sliding surface with respect to a mating member on an outer peripheral portion thereof, and a cylindrical mounting tube portion extending in the axial direction from the main body, and the main body portion of the rotating member. An inner diameter of the shaft insertion hole is formed larger than an inner diameter of the shaft insertion hole of the mounting cylinder portion, the shaft tube is inserted into the shaft insertion hole of the rotation member, and the mounting cylinder portion of the rotation member Are in direct contact with the adjacent rotating member, and a mandrel is press-fitted into the shaft tube and the shaft tube is extended outwardly, whereby the shaft tube is attached to the mounting tube portion of the rotating member. It is characterized by being crimped .
[0010]
[Action and effect of the invention]
<Invention of Claims 1 and 2 >
According to the first and second aspects of the present invention, the rotating member and the shaft tube are fixed to each other at the mounting tube portion provided on the rotating member. For this reason, the force applied to extend the shaft tube is only transmitted to the mounting cylinder, and no force that deforms the sliding surface is applied to the main body. Is prevented. As a result, the polishing process applied to the sliding surface after the rotating member is fixed to the shaft tube can be omitted, so that the work load in the manufacturing process is reduced.
[0011]
In addition, since the length and thickness of the mounting cylinder can be designed relatively freely, the fixing strength between the shaft tube and the rotating member as compared with the conventional case where the rotating member body and the shaft tube are fixed together. Can be increased.
[0012]
Further , the axial tube extending outwardly by the mandrel bites into a key groove formed in the inner peripheral wall of the axial insertion hole of the mounting tube portion and extending in the axial direction of the axial tube, so that the axial tube and the rotating member are Can be firmly fixed.
[0013]
In addition , a positioning projection is formed on one of the inner peripheral portion of the shaft insertion hole of the mounting cylinder portion and the outer peripheral portion of the shaft tube, and the other is a positioning groove that extends in the axial direction of the shaft tube and fits with the positioning projection. Thus, when the rotating member is fixed to the shaft tube, positioning in the circumferential direction with respect to the shaft tube can be performed by engaging the positioning protrusion and the positioning groove. As a result, the relative arrangement of the rotating members can be easily determined, so that the work load in the manufacturing process can be reduced.
[0014]
Further , it is possible to manufacture a composite camshaft in which the rotating member and the shaft tube are fixed in a state where the mounting cylinder portion of the rotating member is in contact with the adjacent rotating member directly or via a spacer. For this reason, in the past, the mounting interval between the rotating member bodies was adjusted using a dedicated spacing adjustment tool, but the spacing adjustment tool was used by adjusting the mounting tube to a predetermined length. The interval between the rotating member bodies can be adjusted without doing so. As a result, the work load in the manufacturing process can be reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
< Reference Example 1 >
Reference Example 1 will be described with reference to FIGS.
In the composite camshaft 10 of this reference example , a cam tube 30 as a rotating member is fixed to a hollow shaft tube 20 (see FIG. 1).
[0017]
The cam tube 30 includes a main body 31 and a pair of attachment tube portions 32 located on both sides thereof. The main body 31 has a plate shape with a substantially oval cross section, and a profile surface (corresponding to a sliding surface) that slides with a rocker arm (not shown) is formed on the outer peripheral surface thereof. Further, a shaft insertion hole 33 through which the shaft tube 20 can be inserted is formed in the main body 31.
[0018]
The mounting cylinder portion 32 extends in the axial direction on both the left and right sides so as to be continuous with the shaft insertion hole 33 of the main body 31, and the inner peripheral surface forms the shaft insertion hole 34. Here, the inner diameter d2 of the shaft insertion hole 34 of the mounting cylinder portion 32 is smaller than the inner diameter d1 of the shaft insertion hole 33 of the main body 31 (see FIG. 4). Four key grooves 35 are formed at regular intervals along the axial direction on the inner peripheral surface of the shaft insertion hole 34 of the mounting cylinder portion 32, and the protrusions 21 formed on the shaft tube 20 are formed here. Bites in (see FIG. 3).
[0019]
Next, a method for fixing the cam tube 30 to the shaft tube 20 will be described.
First, after passing the shaft tube 20 through the shaft insertion holes 33 and 34 of the cam tube 30 (see FIGS. 4, 5, and 6), the rod-shaped mandrel 40 is press-fitted into the shaft tube 20 in this state (see FIG. 4). 7). A total of four spline-shaped protrusions 41 are provided on the outer periphery of the mandrel 40 at positions corresponding to the key grooves 35 provided in the mounting cylinder part 32, and these protrusions 41 are connected to the key grooves 35. The shaft tube 20 is press-fitted in a state of matching. The outer diameter d3 of the mandrel 40 is substantially the same as the inner diameter d4 of the shaft tube 20, and the height of the protrusion 41 is lower than the depth of the key groove 35 provided in the mounting cylinder 32. For this reason, when the mandrel 40 is press-fitted into the shaft tube 20, the outer wall of the shaft tube 20 is extended by the protrusion 41 of the mandrel 40 to form the protrusion 21, and protrudes into the four key grooves 35 of the mounting cylinder portion 32. As the portion 21 bites in, the cam tube 30 and the shaft tube 20 are pressure-bonded (see FIGS. 2 and 3).
[0020]
According to the composite camshaft 10 of the present reference example manufactured as described above, the mounting tube portion 32 is provided in the cam tube 30, and the inner diameter d1 of the shaft insertion hole 33 of the main body 31 is the shaft insertion hole of the mounting tube portion. It is larger than the inner diameter d2 of 34. For this reason, when the shaft tube 20 is extended by the mandrel 40, a large force is applied to the mounting tube portion 32. However, the protrusion 21 formed on the shaft tube 20 does not contact the shaft insertion hole 33, and the main body 31. Power is not directly applied to. Therefore, the profile surface provided on the main body of the cam tube 30 is not deformed when being fixed to the shaft tube 20. Therefore, the polishing process after fixing to the profile surface is not required, and the work load in the manufacturing process can be reduced. In addition, since the length and thickness of the mounting cylinder portion 32 can be designed relatively freely, the shaft tube 20 and the cam tube 30 are compared to the case where the cam tube body and the shaft tube are directly fixed as in the prior art. The fixing strength can be increased.
[0021]
<First Embodiment>
A first embodiment of the present invention will be described with reference to FIG.
The first embodiment, the positioning protrusions 36 on the mounting cylinder portion 32 is formed, in addition to the positioning grooves 22 in the axial tube 20 is formed, because there is not different fundamentally Reference Example 1, Reference Example 1 and the same parts For the above, the same reference numerals are given and redundant description is omitted.
[0022]
In the first embodiment, a positioning protrusion 36 is provided on the mounting cylinder portion 32, and a positioning groove 22 that engages with the positioning protrusion 36 is provided on the outer peripheral surface of the shaft tube 20. The positioning protrusion 36 engages with the positioning groove 22 to act as a circumferential positioning with respect to the shaft tube 20 when the cam tube 30 is fixed to the shaft tube 20. Therefore, the cam tube 30 is fixed to the shaft tube 20 at an appropriate position due to the presence of the positioning protrusion 36 and the positioning groove 22. More specifically, when a plurality of cam tubes 30 are fixed in the axial direction of the shaft tube 20, when it is desired to exert a cam action by shifting the phase with respect to the counterpart member corresponding to each cam tube 30. Therefore, it is necessary to change the posture of the cam nose 37 for each cam tube 30. In such a case, the position of the positioning projection 36 on the inner peripheral surface of the mounting cylinder portion 32 is made different for each cam tube 30, and the positioning groove 22 corresponding to each positioning projection 36 is provided at the same position in the circumferential direction of the shaft tube 20. Just keep it.
[0023]
< Reference Example 2 >
Reference Example 2 will be described with reference to FIG.
In Reference Example 2 , a plurality of cam tubes 30 are arranged on the shaft tube 20 so that adjacent cam tubes 30 are in contact with each other via a resin spacer 60, and the cam tube 30 is connected to the shaft tube 20 by the described method. After fixing, the spacer 60 is removed.
[0024]
In this reference example , by setting the lengths L1 and L2 of the mounting cylinder portion 32 in advance so that the mounting interval L between the adjacent cam tube main bodies 31 is appropriate, without using an interval adjusting tool. The cam tube main bodies 31 can be arranged at an appropriate interval. For this reason, the work burden in a manufacturing process can be reduced.
[0025]
In addition, as a rotation member in this invention, the sliding surface with respect to the other party member should just be formed in the outer peripheral surface, For example, it can apply also to the journal pipe | tube 50. FIG. Therefore, as shown in the right end of FIG. 11, the attachment tube portion 52 may be provided in the journal tube main body 51 in the same manner as the cam tube 30 described above.
[0026]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
[0027]
(1) In the first reference example , the key groove 35 is formed on the inner peripheral wall of the mounting cylinder portion 32. However, the present invention is not limited to this, and as shown in FIG. The same effects as those of the first embodiment can also be obtained by performing processing and subjecting the outer peripheral portion of the shaft tube 20 to surface roughening treatment such as sandblasting. Also, unlike this, surface roughening treatment such as sandblasting is performed on the inner peripheral wall of the mounting cylinder portion 32, and the outer peripheral portion of the shaft tube 20 is subjected to flat or twill knurling. The same effect as Reference Example 1 can be obtained. Furthermore, surface roughening treatment such as sandblasting, or flat or twill knurling may be applied to either the inner peripheral wall of the mounting cylinder portion 32 or the outer peripheral portion of the shaft tube 20. Absent.
[0028]
(2) In the reference example 1 , the inner diameter d1 of the shaft insertion hole 33 of the main body 31 is such a size that the projection 21 formed on the shaft tube 20 does not come into contact, but in a range where the profile surface is not deformed to the main body 31. It may be loosely touching.
[0029]
(3) In the reference example 1 , four key grooves 35 are formed at equal intervals on the inner peripheral wall of the mounting cylinder portion 32. However, the present invention is not limited to this, and as shown in FIG. A large number of key grooves 35 are formed over the entire area, and the mandrel 40 is press-fitted so that the projection 21 formed on the shaft tube 20 bites into any one of the key grooves 35 so that the mounting tube portion 32 and the shaft tube 20 are fixed. You may let them.
[0030]
(4) In Reference Example 1 , the mounting cylinder part 32 is formed on both sides of the main body 31, but the present invention is not limited to this, and even if it is formed only on one side of the main body 31, the same effect as in Reference Example 1 can be obtained. Can do.
[0031]
(5) In Reference Example 1 , the mounting tube portion 32 of the cam tube 30 has a function of fixing the shaft tube 20 and the cam tube 30 to each other. It can also be used as
[0032]
(6) In Reference Example 1 , the shape of the mandrel 40 has a rod shape and is provided with four spline-shaped protrusions 41 on the outer peripheral portion of the tip thereof, but is not limited thereto, and is shown in FIG. As shown in FIG. 9, the outer peripheral portion of the tip of the mandrel 40 has four spline-shaped protrusions 43A, as shown in FIG. And it can also be set as the structure provided with four projection parts 43B of the same spline shape which is higher than the front projection part in the back. Further, the number of protrusions 41 provided on the outer peripheral portion of the tip of the mandrel 40 is not limited to four.
[0033]
(7) In the first embodiment, the positioning projection 36 is formed on the mounting tube portion 32 and the positioning groove 22 is formed on the shaft tube 20. However, the present invention is not limited to this, and the positioning groove is formed on the mounting tube portion 32. Even if the positioning projection is formed on the shaft tube 20, the same effect as that of the first embodiment can be obtained.
[0034]
(8) In the reference example 2 , the cam tube 30 and the journal tube 50 are in contact with each other via the spacer 60 and are fixed to the shaft tube 20. However, the present invention is not limited to this, and as shown in FIG. The shaft tube 20 and the cam tube 30 or the journal tube 50 can be fixed in a state where the members are in direct contact with each other.
[Brief description of the drawings]
In FIG. 1 is a front view [Figure 2] A-A cross-sectional view of a longitudinal cross-sectional view [FIG 3] FIG. 2 composite camshaft in Reference Example 1 composite camshaft in Reference Example 1 [4] Reference Example 1 FIG. 5 is a longitudinal sectional view of a cam tube and a shaft tube showing a state before assembly. FIG. 5 is a longitudinal sectional view showing a state where the cam tube is fitted into the shaft tube in Reference Example 1. FIG. B cross-sectional view [FIG. 7] A longitudinal cross-sectional view showing a state when the mandrel is press-fitted and the shaft tube is extended in Reference Example 1. [FIG. 8] A front view of the mandrel in another embodiment (5). 9] in another embodiment (5), a perspective view of the cam tube and the shaft tube in the first embodiment a front view of the mandrel Figure 10] [11] reference example 2, the cam tube in the axial tube, and the journal tube us in the front view [12] reference example 2 representing the state of being fixed via a spacer Fig. 13 is a front view showing a state in which the cam tube and the journal tube are directly fixed to the shaft tube. Fig. 13 is a view corresponding to Fig. 3 in the other embodiment (2). Fig. 14 is another embodiment (1). , Vertical sectional view of cam tube and shaft tube showing the state before assembly [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Composite cam shaft 20 ... Shaft tube 21 ... Projection part 22 ... Positioning groove 30 ... Cam pipe 31 ... Main body 32 ... Mounting cylinder part 33, 34 ... Shaft insertion hole 35 ... Key groove 36 ... Positioning protrusion 40 ... Mandrel 50 ... Journal tube

Claims (2)

中空の軸管に、その軸管を挿通させる軸挿通孔が設けられた回転部材を嵌合して固着してなる複合カムシャフトであって、前記回転部材は、その外周部に相手部材に対する摺動面を備えた本体と、この本体から前記軸管の軸方向に延出された筒状の取付筒部とを備え、前記回転部材のうち前記本体部分の軸挿通孔の内径は前記取付筒部の軸挿通孔の内径よりも径大に形成されており、前記軸管が前記軸挿通孔に挿入された状態で前記軸管内に圧入したマンドレルにより前記軸管が外側に展延されることによって前記取付筒部に圧着されており、
前記取付筒部の軸挿通孔の内周壁には、前記軸管の軸方向に延びるキー溝が形成されており、前記マンドレルにより外側に展延された軸管がそのキー溝に食い込んでおり、
前記取付筒部の軸挿通孔の内周部及び前記軸管の外周部には、いずれか一方に位置決め突起が形成され、他方には、前記軸管の軸方向に延びると共に、前記回転部材の軸挿通孔に前記軸管を挿入する際に前記位置決め突起と係合する位置決め溝が設けられていることを特徴とする複合カムシャフト。
A composite camshaft is formed by fitting and fixing a rotating member provided with a shaft insertion hole through which a shaft tube is inserted into a hollow shaft tube, and the rotating member slides on an outer peripheral portion thereof with respect to a mating member. A main body provided with a moving surface, and a cylindrical mounting cylinder extending from the main body in the axial direction of the axial tube, and the inner diameter of the shaft insertion hole of the main body portion of the rotating member is the mounting cylinder The shaft tube is formed larger than the inner diameter of the shaft insertion hole, and the shaft tube is extended outward by a mandrel press-fitted into the shaft tube with the shaft tube inserted into the shaft insertion hole. being crimped to the mounting cylinder part by,
A key groove extending in the axial direction of the shaft tube is formed on the inner peripheral wall of the shaft insertion hole of the mounting cylinder portion, and the shaft tube extended outward by the mandrel bites into the key groove,
A positioning projection is formed on one of the inner peripheral portion of the shaft insertion hole of the mounting cylinder portion and the outer peripheral portion of the shaft tube, and the other is extended in the axial direction of the shaft tube. A composite camshaft comprising a positioning groove that engages with the positioning protrusion when the shaft tube is inserted into the shaft insertion hole .
中空の軸管に、その軸管を挿通させる軸挿通孔が設けられた複数個の回転部材を嵌合して固着してなる複合カムシャフトを製造する方法であって、A method of manufacturing a composite camshaft formed by fitting and fixing a plurality of rotating members provided with a shaft insertion hole through which a shaft tube is inserted into a hollow shaft tube,
前記回転部材は、その外周部に相手部材に対する摺動面を備えた本体と、この本体から軸方向に延出された筒状の取付筒部とを備えると共に前記回転部材のうち前記本体部分の軸挿通孔の内径は前記取付筒部の軸挿通孔の内径よりも径大に形成されており、  The rotating member includes a main body having a sliding surface with respect to a mating member on an outer peripheral portion thereof, and a cylindrical mounting tube portion extending in an axial direction from the main body, and of the main body portion of the rotating member. The inner diameter of the shaft insertion hole is formed larger than the inner diameter of the shaft insertion hole of the mounting tube portion,
前記回転部材の軸挿通孔に前記軸管を挿入し、前記回転部材の前記取付筒部が隣の回転部材に直接に接触する状態となした上で、前記軸管内にマンドレルを圧入して前記軸管を外側に展延することによって前記軸管を前記回転部材の前記取付筒部に圧着することを特徴とする複合カムシャフトの製造方法。  The shaft tube is inserted into the shaft insertion hole of the rotating member, and after the mounting tube portion of the rotating member is in direct contact with the adjacent rotating member, a mandrel is press-fitted into the shaft tube, A method of manufacturing a composite camshaft, wherein the shaft tube is crimped to the mounting tube portion of the rotating member by extending the shaft tube outward.
JP2002165540A 2002-06-06 2002-06-06 Composite camshaft and manufacturing method thereof Expired - Fee Related JP4234953B2 (en)

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ATE495392T1 (en) * 2005-01-20 2011-01-15 Otics Corp CAMSHAFT AND PRODUCTION PROCESS FOR A CAMSHAFT
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