JP3438036B2 - Rocker arm - Google Patents
Rocker armInfo
- Publication number
- JP3438036B2 JP3438036B2 JP10609797A JP10609797A JP3438036B2 JP 3438036 B2 JP3438036 B2 JP 3438036B2 JP 10609797 A JP10609797 A JP 10609797A JP 10609797 A JP10609797 A JP 10609797A JP 3438036 B2 JP3438036 B2 JP 3438036B2
- Authority
- JP
- Japan
- Prior art keywords
- pair
- rocker arm
- wall portions
- wall
- cylindrical
- 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]
【発明の属する技術分野】本発明は、カムにより傾動さ
せられてシリンダヘッドに設けられたバルブの開閉を行
うセンターピボットタイプのロッカアームに関する。特
に本発明のロッカアームは、主要部が板金加工により製
作されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center pivot type rocker arm that is tilted by a cam to open and close a valve provided in a cylinder head. In particular, the rocker arm of the present invention has a main part manufactured by sheet metal working.
【0002】[0002]
【従来の技術】従来のこの種の板金製のロッカアームと
して、例えば実願昭57−51031号(実開昭58−
152503号)のマイクロフィルムに示されている。2. Description of the Related Art As a conventional rocker arm made of sheet metal of this type, for example, Japanese Patent Application No. 57-51031 (Japanese Utility Model Application Laid-Open No. 58-58).
No. 152503).
【0003】この従来のロッカアームでは、平板を屈曲
してなる一対の壁部の長手方向中間に貫通孔が設けら
れ、この貫通孔に円筒形のブッシュが嵌入固定されてお
り、このブッシュに傾動支点軸が挿通されるようになっ
ている。この傾動支点軸がシリンダヘッドなどに支持さ
れる。In this conventional rocker arm, a through hole is provided in the middle of the pair of wall portions formed by bending a flat plate in the longitudinal direction, and a cylindrical bush is fitted and fixed in the through hole, and a tilting fulcrum is supported on the bush. The shaft is designed to be inserted. The tilt fulcrum shaft is supported by the cylinder head or the like.
【0004】なお、前述のブッシュは、その軸方向一端
に径方向外向きのフランジが設けられており、このブッ
シュは一対の壁部の貫通孔に嵌入された後、ブッシュの
軸方向他端がかしめられることにより、固定されてい
る。The bush described above is provided with a flange outward in the radial direction at one end in the axial direction, and after the bush is fitted into the through holes of the pair of wall portions, the other end in the axial direction of the bush is provided. It is fixed by being caulked.
【0005】[0005]
【発明が解決しようとする課題】ところで、上記従来の
ロッカアームでは、その傾動動作に伴う荷重を一対の壁
部の貫通孔で受けさせるようにしているので、壁部の貫
通孔に過大な面圧がかかるようになっている。そのた
め、経時的に壁部が変形しやすくなり、ロッカアームの
がたつきが発生するおそれがある。By the way, in the above-mentioned conventional rocker arm, since the load caused by the tilting motion is received by the through holes of the pair of wall portions, an excessive surface pressure is applied to the through holes of the wall portions. It is supposed to take. Therefore, the wall portion is likely to be deformed with time, and rattling of the rocker arm may occur.
【0006】したがって、本発明は、ロッカアームにお
いて、壁部における傾動支点軸の支持剛性を向上するこ
とを目的としている。Therefore, an object of the present invention is to improve the support rigidity of the tilt fulcrum shaft in the wall portion of the rocker arm.
【0007】[0007]
【課題を解決するための手段】本発明のロッカアーム
は、カムにより傾動させられてシリンダヘッドに設けら
れたバルブの開閉を行うセンターピボットタイプのロッ
カアームであって、平板を屈曲してほぼ平行に対向し、
互いに離隔する一対の壁部が形成され、前記一対の壁部
それぞれの長手方向中間に内方に突出する筒状膨出部が
一体的に設けられ、前記両筒状膨出部に傾動支点軸が取
り付けられており、前記一対の壁部それぞれの自由端側
に取付孔が設けられ、前記一対の壁部の対向間にカムに
当接するローラが位置する状態で前記両取付孔に該ロー
ラを外装した支軸の両端が嵌入固定され、前記一対の壁
部の屈曲支点部分にバルブの上端に当接させられるバル
ブ受け部が設けられている。A rocker arm of the present invention is a center pivot type rocker arm that is tilted by a cam to open and close a valve provided in a cylinder head, and bends a flat plate to face each other substantially in parallel. Then
A pair of wall portions are formed to be spaced apart from each other, the pair of wall portions
Cylindrical bulged portion protruding toward the inner to the respective longitudinal intermediate
Integrally installed , the tilting fulcrum shaft is attached to both the cylindrical bulging parts.
Attached to the free end side of each of the pair of wall portions.
A mounting hole is provided in the
When the abutting rollers are positioned,
Both ends of a support shaft that covers the blade are fitted and fixed, and a valve receiving portion that is brought into contact with the upper end of the valve is provided at a bending fulcrum portion of the pair of wall portions.
【0008】[0008]
【0009】[0009]
【0010】なお、前述の一対の壁部の各筒状膨出部に
は、円筒部材の両端を嵌入固定して、この円筒部材に傾
動支点軸を相対回転可能に挿通することができる。Both ends of the cylindrical member can be fitted and fixed to the cylindrical bulging portions of the pair of wall portions, and the tilting fulcrum shaft can be relatively rotatably inserted into the cylindrical member.
【0011】要するに、本発明では、壁部に筒状膨出部
を設け、この筒状膨出部に中空軸を介して傾動支点軸を
間接的に取り付けるか、あるいは傾動支点軸を直接的に
取り付けることにより、傾動動作に伴う荷重を壁部の肉
厚よりも幅広の筒状膨出部で受けさせるようにしてい
る。そのため、壁部に作用する面圧が従来に比べて小さ
くなるなど、壁部における傾動支点軸の支持剛性が高め
られることになる。In short, according to the present invention, the wall portion is provided with the tubular bulging portion, and the tilting fulcrum shaft is indirectly attached to the tubular bulging portion via the hollow shaft, or the tilting fulcrum shaft is directly attached. By being attached, the load caused by the tilting motion is received by the tubular bulging portion having a width wider than the wall thickness of the wall portion. For this reason, the surface pressure acting on the wall portion becomes smaller than that in the conventional case, so that the supporting rigidity of the tilt fulcrum shaft in the wall portion is enhanced.
【0012】[0012]
【発明の実施の形態】本発明の詳細を図1ないし図7に
示す実施例に基づいて説明する。DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described with reference to the embodiments shown in FIGS.
【0013】図1ないし図3は本発明の実施形態1にか
かり、図1は、ロッカアームの分解斜視図、図2は、ロ
ッカアームの側面図、図3は、図2の(3)−(3)線
断面の矢視図である。図中、1はカム、2はバルブ、3
はロッカアームである。1 to 3 relate to a first embodiment of the present invention. FIG. 1 is an exploded perspective view of a rocker arm, FIG. 2 is a side view of the rocker arm, and FIG. 3 is (3)-(3) of FIG. ) It is an arrow view of a line cross section. In the figure, 1 is a cam, 2 is a valve, 3
Is a rocker arm.
【0014】ロッカアーム3は、ほぼ平行に対向する一
対の壁部31,31の自由端側にカム1が転接するカム
受け部としてのローラ32が複数の針状ころ33および
支軸34を介して取り付けられ、一対の壁部31,31
の連結部35にバルブ2の上端が当接されるバルブ受け
部としてのねじ軸36が取り付けられ、一対の壁部3
1,31の長手方向中間に中空軸37を介して傾動支点
軸38が取り付けられており、長手方向中間の傾動支点
軸38を支点として傾動するようになっている。なお、
傾動支点軸38は図示省略のシリンダヘッドなどに支持
される。In the rocker arm 3, a roller 32 as a cam receiving portion on which the cam 1 is in rolling contact with the free ends of a pair of wall portions 31 facing each other in parallel is provided with a plurality of needle rollers 33 and a support shaft 34. Attached, a pair of wall parts 31, 31
A screw shaft 36 as a valve receiving portion with which the upper end of the valve 2 abuts is attached to the connecting portion 35 of the pair of wall portions 3
A tilting fulcrum shaft 38 is attached to an intermediate portion in the longitudinal direction of 1, 31 via a hollow shaft 37, and tilts with the tilting fulcrum shaft 38 in the longitudinal direction as a fulcrum. In addition,
The tilt fulcrum shaft 38 is supported by a cylinder head (not shown) or the like.
【0015】そして、一対の壁部31,31の長手方向
中間には、内方にそれぞれ突出する傾動支点軸取付用の
円筒状膨出部39,39が設けられており、この各円筒
状膨出部39,39に、円筒部材としての中空軸37の
両端が嵌入固定されている。この中空軸37に傾動支点
軸38が相対回転可能に挿通されている。中空軸37
は、鋼管材あるいは自己潤滑性を有する材料、例えば銅
合金などからなる。Further, in the middle of the pair of wall portions 31, 31 in the longitudinal direction, there are provided inwardly projecting cylindrical swelling portions 39, 39 for mounting the tilting fulcrum shaft, respectively. Both ends of a hollow shaft 37 as a cylindrical member are fitted and fixed to the projecting portions 39, 39. A tilting fulcrum shaft 38 is inserted into the hollow shaft 37 so as to be relatively rotatable. Hollow shaft 37
Is a steel pipe material or a material having a self-lubricating property, such as a copper alloy.
【0016】次に、上記ロッカアーム3の製作方法を簡
単に説明する。Next, a method of manufacturing the rocker arm 3 will be briefly described.
【0017】まず、壁部31,31を製作する。すなわ
ち、一枚の金属板を所要形状に打ち抜く。このとき、壁
部31,31における所要位置を絞り成形することによ
り、底付きの円筒膨出部を形成するとともにその底部を
打ち抜くようにし、さらに、壁部31,31の自由端側
を円形に打ち抜くことによりローラ32の支軸34の取
付孔40,40を形成するようにしている。前述の円筒
膨出部が、上述した円筒状膨出部39となる。この加工
品の長手方向中央を支点として2つ折りに屈曲し、この
屈曲支点部分を円筒形に湾曲させつつ、その近傍を密接
させ、端縁側部分をほぼ平行に対向させる。この加工品
の前記密接部分を溶接などにより接合するとともに、前
記円筒形に湾曲した屈曲支点部分の内面にねじ溝を刻設
する。この屈曲支点部分が上述した連結部35となる。First, the walls 31, 31 are manufactured. That is, one metal plate is punched into a required shape. At this time, by drawing the required positions on the wall portions 31, 31, a cylindrical bulging portion with a bottom is formed and the bottom portion is punched out, and further, the free end sides of the wall portions 31, 31 are made circular. The mounting holes 40, 40 of the support shaft 34 of the roller 32 are formed by punching. The above-mentioned cylindrical bulging portion becomes the above-mentioned cylindrical bulging portion 39. The processed product is bent into two folds with the center in the longitudinal direction as a fulcrum, and while the bending fulcrum part is curved into a cylindrical shape, the vicinity thereof is brought into close contact with each other and the end side parts are made to face each other substantially in parallel. The close contact portion of this processed product is joined by welding or the like, and a screw groove is formed on the inner surface of the bending fulcrum portion curved in the cylindrical shape. This bending fulcrum portion becomes the above-mentioned connecting portion 35.
【0018】次いで、上記壁部31,31の各円筒状膨
出部39,39に中空軸37を圧入あるいは焼き嵌めに
より嵌入固定し、さらに連結部35に下側からねじ軸3
6を螺着する。なお、中空軸37は、溶接により固定し
てもよいし、あるいは中空軸37の軸端をかしめること
により固定してもよい。Next, the hollow shaft 37 is press-fitted or shrink-fitted into the cylindrical bulging portions 39, 39 of the wall portions 31, 31 to be fixed thereto, and the screw shaft 3 is inserted into the connecting portion 35 from below.
Screw 6 on. The hollow shaft 37 may be fixed by welding, or may be fixed by caulking the shaft end of the hollow shaft 37.
【0019】この後、上記壁部31,31の自由端の取
付孔40に、複数の針状ころ33を介してローラ32を
外装した支軸34の両端を圧入あるいは焼き嵌めにより
嵌入固定する。この支軸34は、溶接により固定しても
よいし、あるいは支軸34の軸端をかしめることにより
固定してもよい。After that, both ends of the support shaft 34, which covers the roller 32 via a plurality of needle rollers 33, are fitted and fixed into the mounting holes 40 at the free ends of the walls 31, 31 by press fitting or shrink fitting. The support shaft 34 may be fixed by welding, or may be fixed by caulking the shaft end of the support shaft 34.
【0020】以上説明したように、本実施形態のロッカ
アーム3は、一対の壁部31,31に円筒状膨出部3
9,39を設け、この円筒状膨出部39,39に中空軸
37を取り付け、この中空軸37に傾動支点軸38を挿
通させるようにしているから、傾動動作に伴う荷重を、
壁部31,31の肉厚よりも幅広となった円筒状膨出部
39,39で受けさせることができる。そのため、壁部
31,31での面圧を従来に比べて小さくできるように
なるなど、壁部31,31における傾動支点軸38の支
持剛性を高めることができる。これにより、円筒状膨出
部39,39が長期にわたって変形しにくくなって、ロ
ッカアーム3のがたつきの発生を防止することができる
ようになる。As described above, the rocker arm 3 of this embodiment has the cylindrical bulging portion 3 on the pair of wall portions 31, 31.
9 and 39 are provided, and the hollow shaft 37 is attached to the cylindrical bulging portions 39 and 39, and the tilting fulcrum shaft 38 is inserted into the hollow shaft 37.
It can be received by the cylindrical bulging portions 39, 39 which are wider than the wall portions 31, 31. Therefore, the surface pressure on the wall portions 31, 31 can be made smaller than in the conventional case, and the supporting rigidity of the tilting fulcrum shaft 38 on the wall portions 31, 31 can be increased. This makes it difficult for the cylindrical bulging portions 39, 39 to deform for a long period of time, and prevents the rocker arm 3 from rattling.
【0021】なお、本発明は上述した実施形態のみに限
定されるものではなく、種々な応用や変形が考えられ
る。The present invention is not limited to the above-described embodiments, but various applications and modifications can be considered.
【0022】[0022]
【0023】ロッカアーム3は、上記実施例1で説明し
たものの他に、図6に示すような構成のものにも本発明
を適用することができるなど、要するに、センターピボ
ットタイプであれば本発明を適用することができる。[0023] b Kkaamu 3, in addition to those described above in Example 1, and it can also apply the present invention to constituted as shown in FIG. 6, in short, the present invention as long as center pivot type Can be applied.
【0024】ここで、図6に示す実施形態2のロッカア
ーム3の構成を説明する。この実施形態2において上記
実施形態1と異なる構成は、一対の壁部31、31の形
状である。つまり、金属板を図7に示すように平面視ほ
ぼコ字形に打ち抜くが、このとき、突片部分A、A(壁
部31、31となる部分)の長手方向中央に円筒状膨出
部39、39を、また、突片部分A、Aの自由端側に円
形の取付孔40、40を、さらに連結部分Bにねじ軸3
6の螺着用膨出部35aを形成しておく。この金属板の
2つの突片部分A、Aをそれらの連結部分Bの破線に沿
って垂直に屈曲する。これにより、一対の壁部31、3
1が形成される。そして、ローラ32、ねじ軸36、中
空軸37が上記実施形態1と同様にしてそれぞれ取り付
けられる。この実施形態2では、上記実施形態1のよう
な一対の壁部31、31間の接合工程が不要であるか
ら、製造コストを低減できる利点がある。The structure of the rocker arm 3 of the second embodiment shown in FIG. 6 will be described. The second embodiment differs from the first embodiment in the shape of the pair of wall portions 31, 31. That is, as shown in FIG. 7, the metal plate is punched out into a substantially U-shape in a plan view. , 39, circular mounting holes 40, 40 on the free end sides of the projecting piece portions A, A, and the screw shaft 3 on the connecting portion B.
The bulging portion 35a for screwing 6 is formed. The two projecting piece portions A, A of this metal plate are bent vertically along the broken lines of their connecting portions B. Thereby, the pair of wall portions 31, 3
1 is formed. Then, the roller 32, the screw shaft 36, and the hollow shaft 37 are mounted in the same manner as in the first embodiment. The second embodiment does not require the joining process between the pair of wall portions 31, 31 as in the first embodiment, and thus has an advantage that the manufacturing cost can be reduced.
【0025】(3) ローラ32は、支軸34に対して
複数の針状ころ33を支持させずにすべり接触により回
転支持させることができる。つまり、ローラ32を支軸
34に対してすきま嵌めしたり、あるいはブッシュなど
のすべり軸受を介して嵌合したりすることができる。(3) The roller 32 can be rotatably supported by sliding contact without supporting the plurality of needle rollers 33 on the support shaft 34. That is, it is possible to fit the roller 32 to the support shaft 34 with a clearance, or to fit it via a slide bearing such as a bush.
【0026】(4)上記実施形態1〜2では、カム受け
部としてローラ32を、バルブ受け部としてねじ軸36
を用いているが、それらは図示しないが適当な金属材か
らなるチップ状の部材などで代用することができる。(4) In the first and second embodiments, the roller 32 is used as the cam receiving portion and the screw shaft 36 is used as the valve receiving portion.
Although not shown, they may be replaced by a chip-shaped member made of a suitable metal material.
【0027】[0027]
【発明の効果】本発明では、傾動動作に伴う荷重を壁部
の肉厚よりも幅広の筒状膨出部で受けさせるようにして
いるから、壁部に作用する面圧を従来に比べて小さくで
きるようになるなど、壁部における傾動支点軸の支持剛
性を高めることができる。そのため、筒状膨出部が長期
にわたって変形しにくくなって、ロッカアームのがたつ
きの発生を防止することができるようになる。According to the present invention, since the load caused by the tilting motion is received by the cylindrical bulging portion having a width wider than the wall thickness of the wall portion, the surface pressure acting on the wall portion is higher than that in the conventional case. Since the size can be reduced, the support rigidity of the tilt fulcrum shaft in the wall can be increased. Therefore, the tubular bulging portion is unlikely to be deformed for a long period of time, and it is possible to prevent rattling of the rocker arm.
【0028】このように、本発明によれば、長期にわた
る安定動作を実現できる、信頼性の高いロッカアームを
提供することができる。As described above, according to the present invention, it is possible to provide a highly reliable rocker arm capable of realizing stable operation for a long period of time.
【図1】本発明の実施形態1にかかるロッカアームの分
解斜視図FIG. 1 is an exploded perspective view of a rocker arm according to a first embodiment of the present invention.
【図2】実施形態1のロッカアームの側面図FIG. 2 is a side view of the rocker arm according to the first embodiment.
【図3】図2の(3)−(3)線断面の矢視図3 is an arrow view of a cross section taken along line (3)-(3) of FIG.
【図4】本発明の実施形態2にかかるロッカアームの斜
視図FIG. 4 is a perspective view of a rocker arm according to a second embodiment of the present invention.
【図5】実施形態2のロッカアームの壁部の屈曲前の打
ち抜き形状を示す平面 [Fig. 5] Fig. 5 is a striking of the rocker arm of the second embodiment before bending the wall portion.
Plane showing punched shape
1 カム 2 バルブ 3 ロッカアーム 31 壁部 35 連結部 36 ねじ軸 37 中空軸 38 傾動支点軸 39 壁部の円筒状膨出部 1 cam 2 valves 3 rocker arm 31 wall 35 Connection 36 screw shaft 37 hollow shaft 38 Tilt fulcrum shaft 39 Cylindrical bulge of wall
フロントページの続き (56)参考文献 特開 昭63−272903(JP,A) 実開 昭58−64805(JP,U) 実開 昭55−36922(JP,U) 実開 昭59−21003(JP,U) 米国特許27176083(US,A) 米国特許5010857(US,A) (58)調査した分野(Int.Cl.7,DB名) F01L 1/18 Continuation of the front page (56) Reference JP-A-63-272903 (JP, A) Actual opening Sho-58-64805 (JP, U) Actual opening Sho-55-36922 (JP, U) Actual opening Sho-59-21003 (JP , U) US Patent 27176083 (US, A) US Patent 5010857 (US, A) (58) Fields investigated (Int.Cl. 7 , DB name) F01L 1/18
Claims (2)
ドに設けられたバルブの開閉を行うセンターピボットタ
イプのロッカアームであって、 平板を屈曲してほぼ平行に対向し、互いに離隔する一対
の壁部が形成され、前記一対の壁部それぞれの長手方向
中間に内方に突出する筒状膨出部が一体的に設けられ、
前記両筒状膨出部に傾動支点軸が取り付けられており、
前記一対の壁部それぞれの自由端側に取付孔が設けら
れ、前記一対の壁部の対向間にカムに当接するローラが
位置する状態で前記両取付孔に該ローラを外装した支軸
の両端が嵌入固定され、前記一対の壁部の屈曲支点部分
にバルブの上端に当接させられるバルブ受け部が設けら
れていることを特徴とするロッカアーム。1. A center pivot type rocker arm that is tilted by a cam to open and close a valve provided in a cylinder head, wherein a pair of wall portions that bend a flat plate and face each other in substantially parallel, and are separated from each other. is formed, the cylindrical bulged portion protruding toward the inner longitudinally intermediate of each of the pair of wall portions are provided integrally,
A tilting fulcrum shaft is attached to both the cylindrical bulging portions,
A mounting hole is provided on the free end side of each of the pair of wall portions.
A roller that abuts the cam between the pair of wall portions facing each other.
Support shaft with the rollers installed in both mounting holes when positioned
Both ends of the wall are fitted and fixed, and the bending fulcrum parts of the pair of wall parts
Is equipped with a valve receiving part that can be brought into contact with the upper end of the valve.
Rocker arm, characterized by being.
筒部材の両端が嵌入固定されて、この円筒部材に傾動支
点軸が相対回転可能に挿通される、請求項1に記載のロ
ッカアーム。2. A circular shape is formed on each of the cylindrical bulging portions of the pair of wall portions.
Both ends of the cylindrical member are fitted and fixed, and the tilting support is attached to this cylindrical member.
The rocker arm according to claim 1, wherein the point axis is relatively rotatably inserted therethrough.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10609797A JP3438036B2 (en) | 1997-04-23 | 1997-04-23 | Rocker arm |
US09/059,256 US6041747A (en) | 1997-04-23 | 1998-04-14 | Rocker arm |
DE19817849A DE19817849B4 (en) | 1997-04-23 | 1998-04-22 | rocker arm |
US09/506,835 US6283077B1 (en) | 1997-04-23 | 2000-02-18 | Rocker arm |
US09/899,918 US6516766B2 (en) | 1997-04-23 | 2001-07-09 | Rocker arm |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10609797A JP3438036B2 (en) | 1997-04-23 | 1997-04-23 | Rocker arm |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10299430A JPH10299430A (en) | 1998-11-10 |
JP3438036B2 true JP3438036B2 (en) | 2003-08-18 |
Family
ID=14425038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10609797A Expired - Fee Related JP3438036B2 (en) | 1997-04-23 | 1997-04-23 | Rocker arm |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3438036B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6807932B2 (en) | 2001-11-22 | 2004-10-26 | Ntn Corporation | Rocker arm |
WO2020213630A1 (en) * | 2019-04-19 | 2020-10-22 | 株式会社日進製作所 | Rocker arm |
JP6871993B1 (en) * | 2019-11-06 | 2021-05-19 | 株式会社日進製作所 | Rocker arm |
-
1997
- 1997-04-23 JP JP10609797A patent/JP3438036B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH10299430A (en) | 1998-11-10 |
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