JPS60157560A - Cam and camshaft - Google Patents
Cam and camshaftInfo
- Publication number
- JPS60157560A JPS60157560A JP1385284A JP1385284A JPS60157560A JP S60157560 A JPS60157560 A JP S60157560A JP 1385284 A JP1385284 A JP 1385284A JP 1385284 A JP1385284 A JP 1385284A JP S60157560 A JPS60157560 A JP S60157560A
- Authority
- JP
- Japan
- Prior art keywords
- cam piece
- shaft
- cam
- thin plate
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
- F01L2001/0475—Hollow camshafts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）発明の技術分野
本発明は、中空状のシャフトに結合されるカム駒及びそ
のカム駒を用いたカムシャツＩ−の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a cam piece coupled to a hollow shaft and an improvement in a cam shirt I- using the cam piece.
（ロ）従来技術と問題点
−ａに内燃機関のカムシャフトは、カム部がロッカーア
ームやタペットと衝撃的に接して摺動するので、摩耗が
多く、そのため従来は摺動面のみをチル化させた鋳鉄製
のカムシャフトが多く使用されている。(b) Conventional technology and problems - (a) The cam shaft of an internal combustion engine has a lot of wear because the cam part slides in contact with the rocker arm and tappet, so conventionally only the sliding surface was chilled. camshafts made of cast iron are often used.
しかし乍ら、鋳鉄のヤング率は１００００〜１２０００
ｋｇ／ｍｍ２と低いため、鋳鉄製のカムシャフトは軸部
の肉厚を厚くして剛性を高めたものとならざるを得す、
重量が大きいという欠点がある。また、前記鋳鉄製のカ
ムシャフトは、カム摺動面にチラー（冷し金）を当てて
チル化させたものであるが、品質のバラツキがある他に
過酷な使用条件下、例えばカーボン粒子で油が汚染され
るディーゼルエンジンや鉛化合物で油が汚染される有鉛
ガソリン使用のエンジンでは摩耗が多いという不具合が
ある。However, the Young's modulus of cast iron is 10,000 to 12,000.
Since the weight is as low as kg/mm2, cast iron camshafts have no choice but to have thicker shafts to increase rigidity.
It has the disadvantage of being heavy. In addition, the cast iron camshaft is chilled by applying a chiller to the cam sliding surface, but in addition to variations in quality, it is also subject to harsh usage conditions, such as carbon particles. Diesel engines, where the oil is contaminated, and engines that use leaded gasoline, where the oil is contaminated with lead compounds, have the problem of high wear.
従来、上述した軽量化とカム部の耐摩耗性を向上させる
方法として、鋼製パイプに他部品をろう付は又は拡散接
合する方法があるが、この方法ではカムシャフトを構成
する部材及びそれを支持するための耐火物で作った支持
治具を高温の雰囲気炉内に入れてろう付は又は拡散接合
するため、設備が大きくなり、作業性並びに経済性に難
があった。Conventionally, as a method for reducing the weight and improving the wear resistance of the cam part as described above, there has been a method of brazing or diffusion bonding other parts to the steel pipe, but in this method, the members constituting the camshaft and their Since a supporting jig made of refractory material is placed in a high-temperature atmosphere furnace and brazed or diffusion bonded, the equipment becomes large and there are difficulties in workability and economy.
また、特公昭４６−２１２９９号、特公昭５６−５０６
号等にもカム駒、ジャーナルを中空状のシャフトに拡管
により結合することの開示はあるが、実用に供し難く、
現実には使用されていない。Also, Special Publication No. 46-21299, Special Publication No. 56-506
Although there is a disclosure in the issue of cam piece and journal to be connected to a hollow shaft by tube expansion, it is difficult to put it into practical use.
Not used in reality.
（ハ）発明の目的
そこで本発明は斯かる従来の問題点を解決すべく創案さ
れたものであり、その目的は、耐摩耗性に優れるととも
に軽量化を可能としたカム駒及びこのカム駒を用いた中
空カムシャフトを提供することにある。(c) Purpose of the Invention The present invention was devised in order to solve the problems of the conventional art, and its purpose is to provide a cam piece that has excellent wear resistance and is lightweight, and to provide a cam piece that has excellent wear resistance and is lightweight. An object of the present invention is to provide a hollow camshaft using the following methods.
仁）発明の構成
本発明はかかる目的を達成するために、第一の発明は、
中空状のシャフトに結合されるカム駒に於て、シャフト
用の貫通孔の内周面に噛合部を設け、かつ、少なくとも
摺動部分に耐摩耗性に優れた薄板部を設けた構成とし、
第二の発明は、鋼製パイプを拡管することによりカム駒
及びジャーナルと結合されてなるカムシャフトに於て、
前記カム駒がシャフト用の貫通孔の内周面に噛合部を設
け、かつ、少なくとも摺動部分に耐摩耗性に優れた薄板
部を設け、またジャーナル部もシャフト用の貫通孔の内
周面に噛合部ををし、６ｆｌ１Ｍパイプの外周面が該カ
ム駒及びジャーナルの噛合部に食い込んで結合されてい
る構成とした。Structure of the invention In order to achieve the above object, the first invention is as follows:
In the cam piece coupled to the hollow shaft, an engaging portion is provided on the inner circumferential surface of the through hole for the shaft, and a thin plate portion with excellent wear resistance is provided at least on the sliding portion,
The second invention is a camshaft which is connected to a cam piece and a journal by expanding a steel pipe,
The cam piece has an engaging portion on the inner circumferential surface of the shaft through hole, and a thin plate portion with excellent wear resistance is provided at least on the sliding portion, and the journal portion also has an engaging portion on the inner circumferential surface of the shaft through hole. The outer circumferential surface of the 6fl1M pipe bites into and is connected to the engaging portions of the cam piece and journal.
けン発明の実施例 以下、本発明を図面に示す実施例に基づいて説明する。Examples of Ken invention Hereinafter, the present invention will be explained based on embodiments shown in the drawings.
第１図は本発明に係るカム駒２を用いたカムシャフト１
の側面図で、中空状のシャフト４に所定数のカム駒２及
びジャーナル３を所定位置に配した後、例えばシャフト
４に拡管棒を圧入して該シャフト４を拡管し、カム駒２
とジャーナル３の内周面に設けた噛合部（例えばセレー
ション、ローレット、はぼ鋸歯状の凹凸等）７の凹部に
該シャフト４を食い込ませ、カムシャフト１の回転力を
伝達するに充分な結合力を以てカム駒２とジャーナル３
を嵌着する。FIG. 1 shows a camshaft 1 using a cam piece 2 according to the present invention.
In the side view, after a predetermined number of cam pieces 2 and journals 3 are arranged at predetermined positions on a hollow shaft 4, for example, a tube expansion rod is press-fitted into the shaft 4 to expand the shaft 4, and the cam pieces 2 are expanded.
The shaft 4 is inserted into the recess of the meshing part (for example, serrations, knurling, sawtooth irregularities, etc.) 7 provided on the inner circumferential surface of the journal 3, and the shaft 4 is coupled sufficiently to transmit the rotational force of the camshaft 1. Cam piece 2 and journal 3 with force
Insert.
本発明に係るカム駒２は、例えば第２図ｆａ）及び山）
に示すように、例えば冷間又は温間鍛造、厚板打抜き若
しくは引抜き加工等の任意の手段により形成された素体
を冷間鍛造にて成形してシャフト４用の貫通孔２ｂを設
けたカム駒母材２ａと、このカム駒母材２ａに接合した
薄板材５とで構成されている。カム駒母材２ａの貫通孔
２ｂの内周面にはシャフト４と結合するための噛合部７
（本実施例では山角９０°、高さ０．’５ｍｍのセレ
ーション）が設けである。この噛合部７は、シャフト４
の拡管時に於けるシャフト４を構成する材料の塑性変形
を考慮してその形状を決定する必要がある。The cam piece 2 according to the present invention is, for example, shown in FIG.
As shown in the figure, a cam is formed by cold forging a base body formed by any method such as cold or warm forging, thick plate punching, or drawing, and is provided with a through hole 2b for the shaft 4. It is composed of a bridge base material 2a and a thin plate material 5 joined to this cam bridge base material 2a. A meshing portion 7 for coupling with the shaft 4 is provided on the inner peripheral surface of the through hole 2b of the cam piece base material 2a.
(In this embodiment, the serrations have a serration angle of 90° and a height of 0.5 mm). This meshing part 7 is connected to the shaft 4
It is necessary to determine the shape of the shaft 4 in consideration of the plastic deformation of the material forming the shaft 4 during tube expansion.
また、薄板材５は、耐摩耗性に優れた材料からなり、カ
ムノーズ２ｃの外周面（少なくともタペットやロッカー
アームとの摺動面となる部分）に拡散接合又はろう付け
６により接合されている。Further, the thin plate material 5 is made of a material with excellent wear resistance, and is joined to the outer circumferential surface of the cam nose 2c (at least the portion that becomes the sliding surface with the tappet and rocker arm) by diffusion bonding or brazing 6.
この薄板材５は、例えば高クロム（５〜３０％）。This thin plate material 5 is, for example, high in chromium (5 to 30%).
高炭素（１，５〜３．５％）の微粉末を有機バインダー
と混練して、これを押出し又はドクターブレード法のよ
うなテープ鋳込み成形で作り、これを所定寸法に切断し
たグリーンシートを用いる。そして、このグリーンシー
トを所定形状に焼結した後にカム駒母材２ａとの間に箔
状のろう材をはさみ込んで、真空中或いは雰囲気炉中で
ろう付は接合するか、またはグリーンシートを直接カム
駒母材２ａ上に置いて真空中或いは雰囲気炉中で加熱し
、焼結と同時に拡張接合を行なう。その後、カム駒２を
焼入れ、焼戻しを行ない、拡散接合時に負荷される周方
向の引張強度以上の強度をカム駒２に与え、また貫通孔
２ｂの内周面に形成されている噛合部７の強度を高め、
拡管接合時の噛合を容易にする。A green sheet is used by kneading a high carbon (1.5-3.5%) fine powder with an organic binder, making it by extrusion or tape casting such as a doctor blade method, and cutting it into a predetermined size. . After this green sheet is sintered into a predetermined shape, a foil-shaped brazing material is sandwiched between it and the cam piece base material 2a, and the green sheet is joined by brazing in a vacuum or an atmosphere furnace. It is placed directly on the cam piece base material 2a and heated in a vacuum or atmosphere furnace to perform expansion bonding at the same time as sintering. Thereafter, the cam piece 2 is hardened and tempered to give the cam piece 2 a strength greater than the tensile strength in the circumferential direction that is applied during diffusion bonding. Increase strength,
Facilitates engagement during tube expansion and joining.
斯くして、カム駒２の摺動部分（少なくともカムノーズ
２ｃを含む。）に耐摩耗性に優れた薄板材５を形成した
ので、カム駒母材２ａの材料としてはセレーション等の
噛合部７を塑性加工により容易に形成できる低炭素の鋼
材（例えば５４５Ｃ，ＳＣＭ４４０）が使用できる。ま
た、薄板材５の形成手段以外は殆どの作業が冷間塑性加
工により行えるので、連続的に大量に生産することが可
能である。In this way, since the thin plate material 5 with excellent wear resistance is formed on the sliding portion of the cam piece 2 (including at least the cam nose 2c), the engaging portion 7 such as serrations can be used as the material for the cam piece base material 2a. A low carbon steel material (for example, 545C, SCM440) that can be easily formed by plastic working can be used. Further, since most of the work except for forming the thin plate material 5 can be performed by cold plastic working, continuous mass production is possible.
本発明は上記実施例に係る形状に限定するものではなく
、例えば第３図のように噛合部７を二つ又は第４図のよ
うに噛合部７を三つにしたり、或いは例えば第５図（司
又は（ト））のようにカムノーズ２Ｃに凹部２ｃ’ を
設ける等の如き変更も可能である。The present invention is not limited to the shape according to the above-mentioned embodiments. For example, the number of engaging parts 7 may be two as shown in FIG. 3, or three as shown in FIG. It is also possible to make changes such as providing a recess 2c' in the cam nose 2C as shown in (G).
なお、本発明に係るカム駒は、上記実施例の如き冷間塑
性加工法に限らず、例えば焼結、切削加工、鋳造等の手
段によって製造することも可能である。The cam piece according to the present invention is not limited to the cold plastic working method as in the above embodiments, but can also be manufactured by means such as sintering, cutting, and casting.
（へ）発明の効果
上述した如く本発明に係るカム駒は、シャフトとの結合
部を構成する内周面に噛合部を設け、かつ、その摺動面
を薄板部により耐摩耗性が良好にしであるために、カム
駒にシャフトを挿通した後、該シャフトを拡管して該カ
ム駒をシャフトに結合するに際してカム駒に割れが生ず
ることがなく、またカム駒の材料としては塑性加工の容
易な低炭素鋼が使用できる他、強制温浸のための油孔を
カム駒母体部に穴あけ加工することが容易となり、しか
も薄板部に耐摩耗性に優れた任意の組成２組織とするこ
とができるために、摺動相手の材質との相性の良い材質
を選定できる。このため従来の拡管接合用カム駒に比べ
て拡管接合時に必要な機械的性質と、耐摩耗の二律背反
的な特性の具備が容易である。また、カム駒に強度の高
い材質を使用できるため、カム駒母材の肉厚を薄くでき
ることから、パイプ材を素体として塑性加工によって結
合するシャフト用パイプも外径を大きくすることができ
、肉厚を薄くできることから、軽量化を更に図ることが
できる。また、本発明に係るカムシャフトは、カム駒に
シャフトを挿通した後、該シャフトを拡管することによ
り結合されるものであるから、カムシャフトの製造を容
易にするとともにカムシャフトの軽量化を図る上で極め
て有効である。(F) Effects of the Invention As described above, the cam piece according to the present invention has a meshing portion on the inner circumferential surface constituting the connecting portion with the shaft, and has a thin plate portion on the sliding surface to provide good wear resistance. Therefore, after the shaft is inserted into the cam piece, the cam piece is not cracked when the shaft is expanded and the cam piece is connected to the shaft. In addition to being able to use low carbon steel, it is easy to drill oil holes for forced digestion in the cam piece base, and the thin plate part can have any two compositions with excellent wear resistance. Therefore, it is possible to select a material that is compatible with the material of the sliding partner. Therefore, compared to conventional cam pieces for joining pipe expansions, it is easier to provide the mechanical properties necessary for joining pipe expansions and the contradictory characteristics of wear resistance. In addition, since a high-strength material can be used for the cam piece, the wall thickness of the cam piece base material can be made thinner, so the outer diameter of the shaft pipe, which is joined by plastic working using pipe material as the base material, can be increased. Since the wall thickness can be reduced, the weight can be further reduced. Further, the camshaft according to the present invention is connected by inserting the shaft into the cam piece and then expanding the shaft, which facilitates the manufacture of the camshaft and reduces the weight of the camshaft. It is extremely effective.
第１図は本発明に係るカムシャフトの側面図、第２図（
ａｌは本発明の実施例に係るカム駒の横断面図、第２図
（ｂｌはその縦断面図、第３図及び第４図は本発明の別
の実施例を示す縦断面図、第５図（ａｌは本発明の他の
実施例を示す横断面図、第５図（ｂｌはその縦断面図で
ある。
１・・・カムシャフト、２・・・カム駒、３・・・ジャ
ーナル、４・・・シャフト、５・・・薄板材、６・・・
ろう付は又は拡散接合層、７・・・噛合部。
第２図
第５図
＜ａ）Figure 1 is a side view of the camshaft according to the present invention, Figure 2 (
al is a cross-sectional view of a cam piece according to an embodiment of the present invention; FIG. 2 is a longitudinal sectional view thereof; FIGS. (Al is a cross-sectional view showing another embodiment of the present invention, FIG. 5 is a vertical cross-sectional view thereof. 1... Camshaft, 2... Cam piece, 3... Journal, 4 ...Shaft, 5...Thin plate material, 6...
Brazing or diffusion bonding layer, 7...meshing part. Figure 2 Figure 5 <a)
Claims (1)
シャフト用の貫通孔の内周面に噛合部を設け、かつ、少
なくとも摺動部分に耐摩耗性に優れた薄板部を設けたこ
とを特徴とするカム駒。 （２）薄板部は、カム駒母材に拡散接合又はろう付けに
より設けである特許請求の範囲第１項記載のカム駒。 （３）噛合部は、はぼ鋸歯状の凹凸、ローレットセレー
ション等である特許請求の範囲第１項記載のカム駒。 （４）噛合部は、大径と小径の差が１．５ｍｍ以下のセ
レーションであることを特徴とする特許請求の範囲第３
項記載のカム駒。 （５）鋼製バイブを拡管することによりカム駒及びジャ
ーナルと結合されてなるカムシャフトに於て、前記カム
駒がシャフト用の貫通孔の内周面に噛合部を設け、かつ
、少なくとも摺動部分に耐摩耗性に優れた薄板部を設け
、またジャーナルもシャフト用の貫通孔の内周面に噛合
部を有し、鋼製パイプの外周面が該カム駒及びジャーナ
ルの噛合部に食い込んで結合されることを特徴とするカ
ムシャフト。[Claims] (1,1 In a cam piece coupled to a hollow shaft,
A cam piece characterized in that an engaging part is provided on the inner circumferential surface of a through hole for a shaft, and a thin plate part with excellent wear resistance is provided at least in a sliding part. (2) The cam piece according to claim 1, wherein the thin plate portion is provided on the cam piece base material by diffusion bonding or brazing. (3) The cam piece according to claim 1, wherein the engaging portion is a sawtooth-like unevenness, knurling serration, or the like. (4) Claim 3, characterized in that the engaging portion is a serration in which the difference between the large diameter and the small diameter is 1.5 mm or less.
Cam piece described in section. (5) In a camshaft formed by expanding a steel vibrator and connecting it to a cam piece and a journal, the cam piece is provided with an engaging portion on the inner circumferential surface of the shaft through-hole, and at least slides. A thin plate part with excellent wear resistance is provided in the part, and the journal also has a meshing part on the inner peripheral surface of the shaft through hole, so that the outer peripheral surface of the steel pipe bites into the meshing part of the cam piece and the journal. A camshaft characterized in that it is coupled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1385284A JPS60157560A (en) | 1984-01-28 | 1984-01-28 | Cam and camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1385284A JPS60157560A (en) | 1984-01-28 | 1984-01-28 | Cam and camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60157560A true JPS60157560A (en) | 1985-08-17 |
Family
ID=11844804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1385284A Pending JPS60157560A (en) | 1984-01-28 | 1984-01-28 | Cam and camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60157560A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105276128A (en) * | 2014-07-10 | 2016-01-27 | 株式会社瑞进凸轮轴 | Concentric camshaft and method of manufacturing rotatable cam and fixed cam for concentric camshaft |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5731505B2 (en) * | 1978-09-16 | 1982-07-05 | ||
| JPS5870011A (en) * | 1981-10-21 | 1983-04-26 | Nissan Motor Co Ltd | Method of molding pipe type cam shaft |
-
1984
- 1984-01-28 JP JP1385284A patent/JPS60157560A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5731505B2 (en) * | 1978-09-16 | 1982-07-05 | ||
| JPS5870011A (en) * | 1981-10-21 | 1983-04-26 | Nissan Motor Co Ltd | Method of molding pipe type cam shaft |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105276128A (en) * | 2014-07-10 | 2016-01-27 | 株式会社瑞进凸轮轴 | Concentric camshaft and method of manufacturing rotatable cam and fixed cam for concentric camshaft |
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