JP3306481B2 - Rocker arm manufacturing method - Google Patents
Rocker arm manufacturing methodInfo
- Publication number
- JP3306481B2 JP3306481B2 JP01753194A JP1753194A JP3306481B2 JP 3306481 B2 JP3306481 B2 JP 3306481B2 JP 01753194 A JP01753194 A JP 01753194A JP 1753194 A JP1753194 A JP 1753194A JP 3306481 B2 JP3306481 B2 JP 3306481B2
- Authority
- JP
- Japan
- Prior art keywords
- rocker arm
- pair
- frame
- curved
- wall portions
- 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 - Fee Related
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エンジンのバルブ開閉
に利用されるロッカアームの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rocker arm used for opening and closing a valve of an engine.
【０００２】[0002]
【従来の技術】従来のロッカアームの製造方法として、
本願出願人は、例えば特開平３−１７２５０６号公報に
示すようなものを提案している。これを図９および図１
０に示して説明する。図９は完成状態のロッカアームの
側面図、図１０はロッカアームの製作工程図である。2. Description of the Related Art Conventional rocker arm manufacturing methods include:
The applicant of the present application has proposed, for example, one disclosed in Japanese Patent Application Laid-Open No. 3-172506. This is shown in FIG. 9 and FIG.
0 is described. FIG. 9 is a side view of the rocker arm in a completed state, and FIG. 10 is a manufacturing process diagram of the rocker arm.
【０００３】ロッカアーム４０は、プレス製のフレーム
４１にローラ４２を軸４３およびニードルローラ軸受４
４を介して回転自在に取り付けた構成である。The rocker arm 40 is composed of a frame 41 made of a press, a roller 42 and a shaft 43 and a needle roller bearing 4.
4, and is rotatably mounted.
【０００４】フレーム４１は、１つの部材からなるワン
ピース構造であり、ほぼ平行に対向する一対の壁部４
５、４５と、一対の壁部４５、４５の長手方向一端側で
それらの間に架橋状に連接されかつ壁部４５、４５の長
手方向に沿って湾曲成形されるバルブ係合用の湾曲部４
６と、一対の壁部４５、４５の長手方向他端側にそれら
の間に架橋状に連接されかつ中央に半球状のピボット係
合部４８が設けられる平坦部４７とを備えている。な
お、前述の壁部４５、４５には軸支持用孔が形成され該
孔に軸４３が架け渡されるように取り付けられている。The frame 41 has a one-piece structure composed of one member, and has a pair of wall portions 4 facing each other substantially in parallel.
5 and 45 and a curved portion 4 for valve engagement, which is connected in a bridging manner at one longitudinal end of the pair of wall portions 45 and 45 and is curved and formed along the longitudinal direction of the wall portions 45 and 45.
6 and a flat portion 47 provided at the other end in the longitudinal direction of the pair of wall portions 45, 45 in a bridging manner therebetween and provided with a hemispherical pivot engaging portion 48 at the center. In addition, a shaft supporting hole is formed in the above-mentioned wall portions 45, 45, and the shaft 43 is attached to the hole so as to be bridged.
【０００５】このようなロッカアーム４０は、フレーム
４１の湾曲部４６がバルブステムＶに、また、フレーム
４１の平坦部４７の半球状のピボット係合部４８がラッ
シュアジャスタのピボットＰにそれぞれ係合されるとと
もに、ローラ４２にカムＣが当接される状態で使用さ
れ、カムＣの回転動作に伴ってフレーム４１がピボット
係合部４８を支点として上下に揺動されてバルブステム
Ｖを図示しないバルブガイドに沿って上下に昇降させ
る。In such a rocker arm 40, the curved portion 46 of the frame 41 is engaged with the valve stem V, and the hemispherical pivot engaging portion 48 of the flat portion 47 of the frame 41 is engaged with the pivot P of the lash adjuster. The cam 41 is used in a state where the cam C is in contact with the roller 42, and the frame 41 is swung up and down about the pivot engagement portion 48 as the cam C rotates, so that the valve stem V is not shown. Move up and down along the guide.
【０００６】前述のフレーム４１の製造手順を、図１０
を参照して説明する。なお、図１０において、（ａ）、
（ｃ）、（ｅ）はフレーム４１の下面図、（ｂ）、
（ｄ）、（ｆ）は（ａ）、（ｃ）、（ｅ）の断面矢視図
である。The procedure for manufacturing the above-described frame 41 is shown in FIG.
This will be described with reference to FIG. In FIG. 10, (a),
(C), (e) is a bottom view of the frame 41, (b),
(D), (f) is a sectional arrow view of (a), (c), (e).
【０００７】 図１０（ａ）、（ｂ）に示すように、
絞り成形工程でもって、外形を特定した一枚の金属板Ａ
１を側面視ほぼＵ字形にすると同時に、長手方向の一端
側にほぼ一方面側へ膨出する半球状のピボット係合部Ａ
２を、長手方向の中間に一方面側へ膨出する壁部形成用
の凸部Ａ３をそれぞれ得る。As shown in FIGS. 10A and 10B,
One metal plate A whose outer shape is specified by the draw forming process
1 is substantially U-shaped as viewed from the side, and at the same time, a hemispherical pivot engaging portion A bulging substantially toward one surface at one end in the longitudinal direction.
2, a projection A3 for forming a wall portion swelling toward one surface in the middle of the longitudinal direction is obtained.
【０００８】 図１０（ｃ）、（ｄ）に示すように、
打ち抜き工程でもって、凸部Ａ３の頂部に長手方向の長
孔Ａ４を形成すると同時に、長手方向他端側の平坦部分
Ａ５を湾曲させて湾曲部４６を得る。As shown in FIGS. 10C and 10D,
In the punching step, a long hole A4 in the longitudinal direction is formed at the top of the convex portion A3, and at the same time, the flat portion A5 at the other end in the longitudinal direction is curved to obtain the curved portion 46.
【０００９】 図１０（ｅ）、（ｆ）に示すように、
曲げ工程（バーリング加工）でもって、凸部Ａ３に残る
切り残し片Ａ６、Ａ６を前記Ｕ字形に絞り成形された部
分と平行となるように立てる。この切り残し片Ａ６、Ａ
６と、絞り成形部分とが壁部４５、４５となる。As shown in FIGS. 10E and 10F,
In the bending step (burring), the uncut pieces A6, A6 remaining on the convex portion A3 are set up so as to be parallel to the portion formed by drawing in the U-shape. The uncut pieces A6, A
6 and the drawn part form the wall parts 45, 45.
【００１０】[0010]
【発明が解決しようとする課題】ところで、フレーム４
１の強度アップを図るには、壁部４５、４５の高さをで
きるだけ高く設定すればよいのであるが、このような壁
部４５、４５を得るには、前述のの絞り成形工程にお
いて、壁部形成用の凸部Ａ３の膨出量をできるだけ大き
く設定すればよい。しかしながら、膨出量を大きくする
と絞り成形により凸部Ａ３の金属が展延して、絞り成形
後に凸部Ａ３全体の肉厚が薄くなり、完成後では壁部４
５，４５のローラ支持剛性が不足するおそれがある。The frame 4
In order to increase the strength of 1, the heights of the wall portions 45, 45 may be set as high as possible. The bulging amount of the convex portion A3 for forming the portion may be set as large as possible. However, when the bulging amount is increased, the metal of the convex portion A3 is spread by the drawing, and the whole thickness of the convex portion A3 is reduced after the drawing, and the wall portion 4 is completed after the completion.
There is a possibility that the roller support stiffness of 5,45 may be insufficient.
【００１１】本発明は、このような事情に鑑み、製造過
程での薄肉化を防ぎ、壁部の十分なローラ支持剛性を得
られるようにすることを課題としている。In view of such circumstances, an object of the present invention is to prevent the thickness from being reduced in the manufacturing process and to obtain a sufficient roller supporting rigidity of the wall.
【００１２】[0012]
【課題を解決するための手段】本発明は、長手方向中間
にローラを回転自在に支持するようほぼ平行に対向配置
される一対の壁部および、一対の壁部の長手方向一端側
でそれらの間に架橋状に連接されかつ該壁部の長手方向
に沿って湾曲成形されるバルブ係合用の湾曲部からなる
第１部材と、第１部材の一対の壁部の長手方向他端側で
それらの間に架橋状に接合固着されるピボット係合用の
第２部材とからなるロッカアームを製造する方法におい
て、次のような特徴がある。According to the present invention, there is provided a pair of wall portions which are arranged substantially in parallel and opposed to each other so as to rotatably support a roller at a middle portion in a longitudinal direction, and a pair of the wall portions at one longitudinal end thereof. A first member consisting of a valve engaging curved portion which is connected in a bridging manner and which is curved and formed along the longitudinal direction of the wall portion, and a pair of wall portions of the first member at the other longitudinal end side thereof; The method for manufacturing the rocker arm including the second member for pivot engagement, which is joined and fixed in a bridge shape therebetween, has the following features.
【００１３】本発明の前記第１部材の第１の製造方法
は、一枚の板材から平面視ほぼＶ字形の母材を打ち抜く
工程と、前記母材において二つの帯状部位の連接部位を
帯状部位の仮想対称軸線に垂直な仮想線に対して反らせ
るように湾曲成形する工程と、母材の二つの帯状部位を
水平線に対して所要角度傾かせるように持ち上げる姿勢
として、前記反らせた連接部位の両側辺を前記持ち上げ
方向と逆向きに屈曲して、一対の壁部および湾曲部を得
る工程とを有する。In a first method of manufacturing the first member according to the present invention, a step of punching a substantially V-shaped base material from a single plate material and a step of connecting a connecting portion of two band-shaped portions in the base material to a band-shaped portion are performed. A step of forming a curve so as to be deflected with respect to a virtual line perpendicular to the virtual symmetry axis, and a posture in which the two band-shaped portions of the base material are lifted so as to be inclined at a required angle with respect to the horizontal line, on both sides of the warped connection portion Bending the side in a direction opposite to the lifting direction to obtain a pair of wall portions and a curved portion.
【００１４】[0014]
【００１５】[0015]
【作用】本発明では、要するに、フレームをツーピース
構造として、一対の壁部およびピボット係合用の湾曲部
を一体に連接した第１部材を絞り成形することなく、屈
曲や湾曲の成形のみで製作するようにしている。According to the present invention, in short, the frame has a two-piece structure, and is manufactured only by bending or bending without forming the first member integrally connecting the pair of walls and the curved portion for pivot engagement. Like that.
【００１６】そして、金属板から平面視ほぼＶ字形の第
１部材の母材を打ち抜くときに、二つの帯状部位の各内
側辺を近接させる位置まで大きく張り出させる形状とす
れば、二つの帯状部位の幅寸法を大きくできてフレーム
の壁部について十分なローラ支持剛性が得られる高さに
設定できるようになる。このように、フレームの壁部の
高さ寸法は、金属板から第１部材の母材を打ち抜く段階
において、帯状部位の幅寸法を設定することにより容易
に高く設定できるようになり、従来のように薄肉となら
ない。When the base material of the first member, which is substantially V-shaped in a plan view, is punched out of the metal plate, the two strip-shaped portions are formed so as to protrude greatly to a position close to each inner side. The width of the portion can be increased, and the height of the wall portion of the frame can be set to a value at which sufficient roller support rigidity can be obtained. As described above, the height of the wall of the frame can be easily set high by setting the width of the band-shaped portion at the stage of punching the base material of the first member from the metal plate. It does not become thin.
【００１７】[0017]
【００１８】[0018]
【実施例】以下、本発明の詳細を図１ないし図８に示す
実施例に基づいて説明する。図１はロッカアーム用プレ
ス製フレームの第１部材の製造過程図、図２は第１部材
の屈曲成形時の屈曲位置を示す平面図、図３は第１部材
の屈曲成形時の姿勢を示す側面図、図４ないし図６は完
成状態のロッカアームをそれぞれ示している。図例のロ
ッカアーム１は、プレス製フレーム２にローラ３を軸４
を介して回転自在に取り付けた構造である。なお、軸４
とローラ３との間に鋼製ニードルローラ軸受を配しても
よい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS. 1 is a manufacturing process diagram of a first member of a press-made frame for a rocker arm, FIG. 2 is a plan view showing a bending position of the first member during bending, and FIG. 3 is a side view showing a posture of the first member during bending. FIGS. 4 and 6 show the rocker arm in a completed state. The rocker arm 1 shown in FIG.
It is a structure that is rotatably mounted via a. In addition, shaft 4
A steel needle roller bearing may be arranged between the rollers 3.
【００１９】フレーム２は、二つの部材５、６を連結し
たツーピース構造である。このフレーム２の材料として
は、例えばＪＩＳ規格ＳＣＭ４１５、４２０などのクロ
ムモリブデン鋼、ＪＩＳ規格ＳＣｒ４２０やＳＡＥ規格
５１２０などの肌焼鋼、あるいはＪＩＳ規格ＳＰＣ系の
冷間圧延鋼板やＪＩＳ規格ＳＰＢ系の低炭素鋼板などが
好適に用いられる。第１部材５は、ほぼ平行に対向する
一対の壁部５１、５１と、一対の壁部５１、５１の長手
方向一端側でそれらの間に架橋状に連接されかつ壁部５
１、５１の長手方向に沿って湾曲されるバルブ係合用の
湾曲部５２とからなる。第２部材６は、一対の壁部５
１、５１の長手方向他端側でそれらの間に架橋状に接合
固着されるもので、その中央に半球状のピボット係合部
６１が設けられている。なお、このフレーム２では、湾
曲部５２と第２部材６とが、図５に示すように、壁部５
１、５１の長手方向でのほぼ中心線Ｏ上に位置するよう
に設定されている。The frame 2 has a two-piece structure in which two members 5, 6 are connected. As a material of the frame 2, for example, chromium molybdenum steel such as JIS standard SCM415 or 420, case hardening steel such as JIS standard SCr420 or SAE standard 5120, or cold rolled steel plate of JIS standard SPC or JIS standard SPB series A carbon steel plate or the like is preferably used. The first member 5 includes a pair of wall portions 51, 51 facing each other substantially in parallel, and a pair of wall portions 51, 51 connected to each other at one longitudinal end side of the pair of wall portions 51, 51 in a bridge-like manner.
1, 51 and a curved portion 52 for valve engagement curved along the longitudinal direction. The second member 6 includes a pair of wall portions 5.
At the other end in the longitudinal direction of 1 and 51, they are joined and fixed in a cross-linking manner therebetween, and a hemispherical pivot engaging portion 61 is provided at the center thereof. In this frame 2, the curved portion 52 and the second member 6 are connected to the wall 5 as shown in FIG.
1, 51 are set to be located substantially on the center line O in the longitudinal direction.
【００２０】ローラ３は、フレーム２の一対の壁部５
１、５１の間で長手方向ほぼ中間に架け渡される軸４に
回転自在に外嵌されている。なお、ローラ３は、鋼材
（例えばＪＩＳ規格ＳＵＪ−２）や窒化けい素を主体と
するセラミックスで形成される。このようなロッカアー
ム１は、フレーム２の第１部材５の湾曲部５２がバルブ
ステムＶに、また、フレーム２の第２部材５の半球状の
ピボット係合部６１がラッシュアジャスタのピボットＰ
にそれぞれ係合されるとともに、ローラ３にカムＣが当
接される状態で使用され、カムＣの回転動作に伴ってフ
レーム２がピボット係合部６１を支点として上下に揺動
されてバルブステムＶを図示しないバルブガイドに沿っ
て上下に昇降させる。The roller 3 includes a pair of walls 5 of the frame 2.
It is rotatably fitted to a shaft 4 which is bridged almost midway in the longitudinal direction between the shafts 1 and 51. The roller 3 is made of a steel material (for example, JIS standard SUJ-2) or a ceramic mainly composed of silicon nitride. In such a rocker arm 1, the curved portion 52 of the first member 5 of the frame 2 has a valve stem V, and the hemispherical pivot engaging portion 61 of the second member 5 of the frame 2 has a pivot P of a lash adjuster.
The cam 2 is used in a state where the cam C comes into contact with the roller 3, and the frame 2 is swung up and down around the pivot engagement portion 61 as the cam C rotates, and the valve stem is rotated. V is moved up and down along a valve guide (not shown).
【００２１】次に、フレーム２の第１部材５の製造方法
を、図１ないし図３に基づいて説明する。なお、図１に
おいて、（ａ），（ｃ），（ｅ）は第１部材の母材の斜
視図、（ｂ）、（ｄ）、（ｆ）は第１部材の母材の側面
図である。Next, a method of manufacturing the first member 5 of the frame 2 will be described with reference to FIGS. In FIG. 1, (a), (c), and (e) are perspective views of the base material of the first member, and (b), (d), and (f) are side views of the base material of the first member. is there.
【００２２】 一枚の金属板材（例えばＪＩＳ規格Ｓ
ＣＭ）から、図１（ａ）、（ｂ）に示すように、平面視
でほぼＶ字形の第１部材５の母材Ｂを打ち抜く。この段
階で母材Ｂに軸４の挿通孔Ｂ１が設けられる。挿通孔Ｂ
１はフレーム２を断面Ｕ字形状に屈曲してからドリルで
加工してもよい。なお、このときに、図示しないが、ほ
ぼ長方形の第２部材６の母材を打ち抜いてもよい。ここ
でいうＶ字形とは、二つの帯状部位を先広がりとした形
状を指しており、すり鉢形、花びら形の他、二つの帯状
部位が階段状に広がるような形状でもよい。A single metal plate (for example, JIS standard S
As shown in FIGS. 1A and 1B, the base material B of the first member 5 which is substantially V-shaped in plan view is punched from the CM). At this stage, the base material B is provided with the insertion hole B1 of the shaft 4. Insertion hole B
1 may be formed by bending the frame 2 into a U-shaped cross section and then drilling. At this time, although not shown, a substantially rectangular base material of the second member 6 may be punched. Here, the V-shape refers to a shape in which two band-shaped portions are widened, and may have a shape in which the two band-shaped portions spread stepwise in addition to a mortar shape and a petal shape.
【００２３】 母材Ｂの連接部位Ｂ２を、図２の帯状
部位の仮想対称軸線Ｃ１に垂直な仮想線Ｘ１の位置から
反らせるよう湾曲成形し、図１（ｃ）、（ｄ）のような
形状とする。The connecting portion B2 of the base material B is curved and formed so as to be deviated from the position of a virtual line X1 perpendicular to the virtual symmetry axis C1 of the belt-like portion in FIG. 2, and has a shape as shown in FIGS. 1 (c) and 1 (d). And
【００２４】 図３に示すように、反らせた連接部位
Ｂ２のほぼ長手方向中央位置ＯＰでの接線Ｓを水平にす
ることにより、側方から見て二つの帯状部位Ｂ３、Ｂ４
を前記接線Ｓに対して所要角度θ傾かせるように持ち上
げる姿勢としておいて、連接部位Ｂ２の両側辺部（図２
のＢ５、Ｂ５で示す部分）を、図２の仮想線Ｘ２、Ｘ２
の位置から前記持ち上げ方向と逆向きにプレスによりほ
ぼ９０度屈曲する。このとき、前記連接部位Ｂ２の両側
辺部Ｂ５、Ｂ５に図示しないプレス装置の押し金型が当
接し、図２のハッチングで示す受け金型Ｃによって二つ
の帯状部位Ｂ３、Ｂ４の各内面間の間隔ｄが、Ｕ字形に
屈曲された連接部位Ｂ２の内面間の間隔Ｄよりも大きく
広げられることになり、図１（ｅ）、（ｆ）に示すよう
な形状となる。これで二つの帯状部位Ｂ３、Ｂ４が一対
の壁部５１、５１となる。As shown in FIG. 3, by making the tangent S substantially horizontal at the center position OP in the longitudinal direction of the warped connecting portion B2, the two band-shaped portions B3 and B4 are viewed from the side.
2 in a posture of being lifted so as to be inclined at a required angle θ with respect to the tangent line S,
B5, B5) are replaced with virtual lines X2, X2 in FIG.
From the above position, it is bent approximately 90 degrees by a press in a direction opposite to the lifting direction. At this time, the pressing dies of the press device (not shown) abut on both side portions B5 and B5 of the connecting portion B2, and the receiving mold C shown by hatching in FIG. The distance d is wider than the distance D between the inner surfaces of the connecting portion B2 bent in a U-shape, and the shape is as shown in FIGS. 1E and 1F. Thus, the two band-shaped portions B3 and B4 form a pair of wall portions 51 and 51.
【００２５】 工程により前記工程で反らせた連
接部位Ｂ２の湾曲形状が若干変形するので、この連接部
位Ｂ２の内面を所要の形状にプレスにより成形加工して
精度のよい反り形状に仕上げる。これで連接部位Ｂ２が
湾曲部５２となる。Since the curved shape of the connecting portion B2 which is warped in the above-mentioned process is slightly deformed by the process, the inner surface of the connecting portion B2 is formed into a required shape by a press to finish the warping shape with high accuracy. Thus, the connecting portion B2 becomes the curved portion 52.
【００２６】この後、別途製作した図６に示すような第
２部材６を、第１部材５の一対の壁部５１、５１の自由
端側でそれらの間に架橋状に溶接により接合固着した
後、焼入れ硬化処理を施す。その後、バレル加工などに
より全面を整形加工してから、一対の壁部５１、５１に
軸４を介してローラ３を装着することにより、ロッカア
ーム１が完成する。ちなみに、第２部材６は、金属板
（例えばＪＩＳ規格ＳＣＭ）から長方形に打ち抜いてそ
の中央に半球状のピボット係合部６１を絞り成形するこ
とにより形成されるものである。Thereafter, a second member 6 separately manufactured as shown in FIG. 6 is joined and fixed to the pair of wall portions 51, 51 of the first member 5 at the free end sides thereof by welding in a bridging manner therebetween. After that, a hardening treatment is performed. Thereafter, the entire surface is shaped by barrel processing or the like, and then the roller 3 is mounted on the pair of walls 51, 51 via the shaft 4, whereby the rocker arm 1 is completed. Incidentally, the second member 6 is formed by punching out a rectangular shape from a metal plate (for example, JIS standard SCM) and drawing a hemispherical pivot engaging portion 61 at the center thereof.
【００２７】第２部材６は別体であるため絞り加工を容
易にでき、半球状のピボット係合部６１を高精度に成形
できる。したがって、第２部材６のピボット係合部６１
と、ローラ３及びバルブ係合用の湾曲部５２との相対位
置を高精度に設定できる。Since the second member 6 is a separate member, drawing can be easily performed, and the hemispherical pivot engaging portion 61 can be formed with high precision. Therefore, the pivot engagement portion 61 of the second member 6
And the relative position between the roller 3 and the curved portion 52 for valve engagement can be set with high accuracy.
【００２８】また、前述のの打ち抜き工程において、
二つの帯状部位Ｂ３、Ｂ４の各内側辺を近接させる位置
まで大きく張り出させる形状とすれば、二つの帯状部位
Ｂ３、Ｂ４の幅寸法Ｗ（図２参照）を大きくできてフレ
ーム２の一対の壁部５１、５１について十分なローラ支
持剛性が得られる高さに設定できるようになる。このよ
うに、フレーム２の壁部５１、５１の高さ寸法は、前述
のの打ち抜き工程において、二つの帯状部位Ｂ３、Ｂ
４の幅寸法Ｗを適宜設定することにより容易に高く設定
できるようになり、従来のように薄肉とならない。In the above-described punching step,
If the shape is such that the inner sides of the two strips B3, B4 are greatly extended to the position where they approach each other, the width dimension W (see FIG. 2) of the two strips B3, B4 can be increased, and The wall portions 51 can be set to a height at which sufficient roller support rigidity is obtained. As described above, the heights of the wall portions 51, 51 of the frame 2 are determined by the two band-like portions B3, B in the above-described punching step.
By setting the width dimension W of 4 as appropriate, it is possible to easily set it to be higher, and it is not thinned as in the conventional case.
【００２９】ところで、上記実施例では、打ち抜いた第
１部材５の母材Ｂの連接部位Ｂ２を湾曲成形してから二
つの帯状部位Ｂ３、Ｂ４を屈曲成形するようにしている
けれども、このような順番に限らず、打ち抜いた第１部
材５の母材Ｂの二つの帯状部位Ｂ３、Ｂ４を屈曲成形し
てから、連接部位Ｂ２を湾曲成形するようにしてもよ
い。その場合、例えば、図１（ａ）のように打ち抜いた
母材Ｂを図７（ａ）に示すような仮想線Ｚ１、Ｚ１の位
置から二つの帯状部位Ｂ３、Ｂ４を９０度屈曲すること
により側面から見て図７（ｂ）に示すような形状として
から、平坦な連接部位Ｂ２を反らせるように湾曲成形す
る。この例においては屈曲後に、平坦な連接部位Ｂ２を
水平線上に沿わせると、二つの帯状部位Ｂ３、Ｂ４の中
心線Ｏが水平線に対して傾斜する。この他、図１（ａ）
のように打ち抜いた母材Ｂを図８（ａ）に示すような仮
想線Ｚ２、Ｚ２の位置から二つの帯状部位Ｂ３、Ｂ４を
９０度屈曲することにより側面から見て図８（ｂ）に示
すような形状としてから、平面視ほぼ三角形となる平坦
な連接部位Ｂ２を平面視ほぼ長方形に成形するととも
に、この連接部位Ｂ２を反らせるように湾曲成形する。
この例においては屈曲後に、平坦な連接部位Ｂ２を水平
線上に沿わせると、二つの帯状部位Ｂ３、Ｂ４の中心線
Ｏが水平線に対して平行となる。このようないずれの場
合でも、上記実施例に比べると、平坦な連接部位Ｂ２の
湾曲成形に関する処理が行いずらくなるけれども、形状
としては問題のない仕上げにできる。By the way, in the above embodiment, the connecting portion B2 of the base material B of the stamped first member 5 is curved and then the two band-like portions B3 and B4 are bent and formed. Not limited to the order, the two band-shaped portions B3, B4 of the base material B of the punched first member 5 may be bent and then the connecting portion B2 may be bent. In this case, for example, the base material B punched as shown in FIG. 1A is bent at 90 degrees from two imaginary lines Z1, Z1 as shown in FIG. After being formed into a shape as shown in FIG. 7B when viewed from the side, the flat connecting portion B2 is curved and formed so as to be warped. In this example, when the flat connecting portion B2 is placed on the horizontal line after bending, the center line O of the two band-shaped portions B3 and B4 is inclined with respect to the horizontal line. In addition, FIG.
8B is obtained by bending the two bases B3 and B4 by 90 degrees from the positions of the virtual lines Z2 and Z2 as shown in FIG. From the shape as shown, a flat connecting portion B2, which is substantially triangular in plan view, is formed into a substantially rectangular shape in plan view, and the connecting portion B2 is curved so as to be deflected.
In this example, when the flat connecting portion B2 is placed on the horizontal line after bending, the center line O of the two band-shaped portions B3 and B4 becomes parallel to the horizontal line. In any of these cases, although it is difficult to perform the process relating to the curved forming of the flat connecting portion B2 as compared with the above embodiment, it is possible to finish the shape without any problem.
【００３０】なお、本発明は上記実施例のみに限定され
ない。例えば、フレーム２の全体形状は任意であり、第
１部材５の母材を打ち抜くときの形状で対応できる。The present invention is not limited only to the above embodiment. For example, the overall shape of the frame 2 is arbitrary, and can correspond to the shape when the base material of the first member 5 is punched.
【００３１】[0031]
【発明の効果】本発明では、フレームをツーピース構造
にして、その第１部材をＶ字形に打ち抜いてから湾曲や
屈曲などの成形を施すことにより製作して、従来のよう
な絞り成形を含まない方法としているから、ローラ支持
剛性が十分となる高さの壁部を有するロッカアームを製
作できるようになる。According to the present invention, the frame is formed by forming the frame into a two-piece structure, punching the first member into a V-shape, and then forming the frame into a curve or bend. With this method, it is possible to manufacture a rocker arm having a wall having a height sufficient for roller support rigidity.
【図１】本発明の一実施例のロッカアーム用プレス製フ
レームの第１部材の製造過程を示す図。FIG. 1 is a view showing a process of manufacturing a first member of a press-made frame for a rocker arm according to an embodiment of the present invention.
【図２】第１部材の屈曲成形時の屈曲位置を示す平面
図。FIG. 2 is a plan view showing a bending position at the time of bending forming of a first member.
【図３】第１部材の屈曲成形時の姿勢を示す側面図。FIG. 3 is a side view showing a posture of the first member during bending molding.
【図４】完成状態のロッカアームの斜視図。FIG. 4 is a perspective view of a rocker arm in a completed state.
【図５】完成状態のロッカアームの分解斜視図。FIG. 5 is an exploded perspective view of a rocker arm in a completed state.
【図６】完成状態のロッカアームの側面図。FIG. 6 is a side view of the rocker arm in a completed state.
【図７】本発明の他の実施例で、（ａ）は第１部材の屈
曲位置を示す平面図、（ｂ）は屈曲後の第１部材の側面
図。7A is a plan view showing a bending position of the first member, and FIG. 7B is a side view of the first member after bending, in another embodiment of the present invention.
【図８】本発明のさらに他の実施例で、（ａ）は第１部
材の屈曲位置を示す平面図、（ｂ）は屈曲後の第１部材
の側面図。8A is a plan view showing a bending position of a first member, and FIG. 8B is a side view of the first member after bending, in still another embodiment of the present invention.
【図９】従来の完成状態のロッカアームの側面図。FIG. 9 is a side view of a conventional rocker arm in a completed state.
【図１０】従来のロッカアーム用プレス製フレームの製
造工程図。FIG. 10 is a manufacturing process diagram of a conventional press-made frame for a rocker arm.
１ ロッカアーム ２ フレーム ３ ローラ ４ 軸 ５ フレームの第１部材 ５１ 第１部材の壁部 ５２ 第１部材の湾曲部 ６ フレームの第２部材 ６１ 第２部材のピボット係合部 REFERENCE SIGNS LIST 1 rocker arm 2 frame 3 roller 4 shaft 5 first member 51 of frame 51 wall portion of first member 52 curved portion of first member 6 second member 61 of frame 61 pivot engagement portion of second member
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F01L 1/18 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) F01L 1/18
Claims (1)
るようほぼ平行に対向配置される一対の壁部および、一
対の壁部の長手方向一端側でそれらの間に架橋状に連接
されかつ該壁部の長手方向に沿って湾曲成形されるバル
ブ係合用の湾曲部からなる第１部材と、第１部材の一対
の壁部の長手方向他端側でそれらの間に架橋状に接合固
着されるピボット係合用の第２部材とからなるロッカア
ームを製造する方法であって、 前記第１部材の製造方法が、一枚の板材から平面視ほぼ
Ｖ字形の母材を打ち抜く工程と、 前記母材において二つの帯状部位の連続部位を帯状部位
の仮想対称軸線に垂直な仮想線に対して反らせるように
湾曲成型する工程と、 母材の二つの帯状部位を水平線に対して所要角度傾かせ
るように持ち上げる姿勢として、前記反らせた連続部位
の両側辺を前記持ち上げ方向と逆向きに屈曲して、一対
の壁部および湾曲部を得る工程と、 を有することを特徴とするロッカアームの製造方法。1. A pair of wall portions which are disposed substantially parallel to each other so as to rotatably support a roller in the middle of the longitudinal direction, and are connected to each other at one longitudinal end of the pair of wall portions in a bridging manner therebetween. A first member formed of a curved portion for valve engagement, which is curved and formed along the longitudinal direction of the wall portion; A method for manufacturing a rocker arm including a second member for pivot engagement, wherein the method for manufacturing the first member includes: a step of punching a substantially V-shaped base material from a single plate material in a plan view; A step of forming a curved portion so that a continuous portion of the two strip-shaped portions is deflected with respect to a virtual line perpendicular to the virtual symmetry axis of the strip-shaped portion, and inclining the two strip-shaped portions of the base material by a required angle with respect to a horizontal line. In the lifting position The both sides of the continuous portion was bent in the lifting direction opposite method of the rocker arm, characterized in that it comprises the steps of obtaining a pair of wall portions and the curved portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01753194A JP3306481B2 (en) | 1994-02-14 | 1994-02-14 | Rocker arm manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01753194A JP3306481B2 (en) | 1994-02-14 | 1994-02-14 | Rocker arm manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07224613A JPH07224613A (en) | 1995-08-22 |
| JP3306481B2 true JP3306481B2 (en) | 2002-07-24 |
Family
ID=11946515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01753194A Expired - Fee Related JP3306481B2 (en) | 1994-02-14 | 1994-02-14 | Rocker arm manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3306481B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7836860B2 (en) | 2007-11-21 | 2010-11-23 | Charter Manufacturing Co., Inc. | Engine rocker arm |
-
1994
- 1994-02-14 JP JP01753194A patent/JP3306481B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07224613A (en) | 1995-08-22 |
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