JPH07229407A - Rocker arm - Google Patents
Rocker armInfo
- Publication number
- JPH07229407A JPH07229407A JP2246394A JP2246394A JPH07229407A JP H07229407 A JPH07229407 A JP H07229407A JP 2246394 A JP2246394 A JP 2246394A JP 2246394 A JP2246394 A JP 2246394A JP H07229407 A JPH07229407 A JP H07229407A
- Authority
- JP
- Japan
- Prior art keywords
- connecting portion
- rocker arm
- pair
- wall portions
- frame
- 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.)
- Granted
Links
- 230000002452 interceptive effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エンジンにおいてシリ
ンダヘッドに設けられたバルブをカムの回転に伴って開
閉させるロッカアームに係り、詳しくは、プレス製のフ
レームのピボット側の部分の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm for opening and closing a valve provided on a cylinder head in an engine in accordance with rotation of a cam, and more particularly, to improvement of a pivot side portion of a press frame.
【０００２】[0002]
【従来の技術】従来のこの種のロッカアームの一例を図
８ないし図１０に示す。図８はロッカアームの縦断側面
図、図９は同ロッカアームの斜視図、図１０は同ロッカ
アームの要部の上面図である。図例のロッカアーム４０
は、所要の形状に打ち抜いた金属板をプレス成形してな
るフレーム４１と、ローラ４２とからなる。2. Description of the Related Art An example of a conventional rocker arm of this type is shown in FIGS. FIG. 8 is a vertical sectional side view of the rocker arm, FIG. 9 is a perspective view of the rocker arm, and FIG. 10 is a top view of a main part of the rocker arm. Rocker arm 40 in the illustrated example
Is composed of a frame 41 formed by press-molding a metal plate punched into a required shape, and a roller 42.
【０００３】フレーム４１は、断面逆Ｕ字形で単一の部
材からなるワンピース構造であり、ほぼ平行に対向配置
される垂下状の一対の壁部４３、４３と、一対の壁部４
３、４３の長手方向一端側でそれらの間に架橋状に連接
されかつ半球状のピボット係合部４６が設けられる第１
連接部４４と、一対の壁部４３、４３の長手方向他端側
でそれらの間に架橋状に連接されかつ壁部４３、４３の
長手方向に沿って湾曲成形されるバルブ係合用の第２連
接部４５とを備えている。ピボット係合部４６には、ロ
ーラ４２側へ潤滑油を噴出させる油穴（符号省略）が設
けられている。The frame 41 has a one-piece structure of a single member having an inverted U-shape in cross section, and has a pair of hanging wall portions 43, 43 arranged facing each other substantially in parallel and a pair of wall portions 4.
A first semi-spherical pivot engagement portion 46 is provided between the first and second longitudinal ends of the third and third ends 43, 43 in a bridge-like manner.
Second part for valve engagement, which is connected to the connecting part 44 and the pair of wall parts 43, 43 on the other end side in the longitudinal direction in a bridging manner between them, and is curved along the longitudinal direction of the wall parts 43, 43. And a connecting portion 45. The pivot engagement portion 46 is provided with an oil hole (reference numeral omitted) for ejecting lubricating oil toward the roller 42 side.
【０００４】ローラ４２は、一対の壁部４３，４３に架
け渡される軸４７を介して回転自在に支持されて、フレ
ーム４１の貫通孔４８内に配置されている。The roller 42 is rotatably supported by a shaft 47 spanning a pair of wall portions 43, 43, and is arranged in a through hole 48 of the frame 41.
【０００５】このロッカアーム４０は、クランク軸に連
動するカムＣの回転に伴って、ローラ４２が押され、ラ
ッシュアジャスタのピボットＰが係合するピボット係合
部４６を支点として上下に揺動し、湾曲部４５に係合す
るバルブステム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 rocker arm 40 is swung up and down with a pivot engaging portion 46, which is engaged with the pivot P of the lash adjuster, as a roller 42 is pushed by the rotation of a cam C interlocked with a crankshaft. The valve stem V that engages with the bending portion 45 is moved up and down along a valve guide (not shown).
【０００６】なお、フレーム４１の第１連接部４４の側
は、ピボット係合部４６と壁部４３、４３との間に絞り
成形時の金型受けとなる所要幅Ｄの平坦部分を残して、
半球状のピボット係合部４６を精度よく成形できるよう
にしているために、第１連接部４４の側では、両壁部４
３，４３の幅がある程度以上の幅広となっている。On the side of the first connecting portion 44 of the frame 41, a flat portion having a required width D is formed between the pivot engaging portion 46 and the wall portions 43, 43 so as to receive a die during drawing. ,
Since the hemispherical pivot engaging portion 46 can be accurately molded, the two wall portions 4 are provided on the first connecting portion 44 side.
The width of 3, 43 is wider than a certain amount.
【０００７】[0007]
【発明が解決しようとする課題】ところで、従来のロッ
カアーム４０は、エンジンのシリンダブロックに装着さ
れる点火プラグ装着部（図１０の４９）に対して近接し
た位置に配置されるが、上述したような理由からフレー
ム４１の第１連接部４４の側が幅広に設計されているた
めに、使用対象のエンジン形式によっては、ロッカアー
ム４０が揺動するとき、点火プラグ装着部４９に対して
フレーム４１の第１連接部４４の側で一対の壁部４３、
４３が干渉するようになることがある。By the way, the conventional rocker arm 40 is arranged at a position close to the spark plug mounting portion (49 in FIG. 10) mounted on the cylinder block of the engine. For this reason, the side of the first connecting portion 44 of the frame 41 is designed to be wide. Therefore, when the rocker arm 40 swings, the first connecting portion 44 of the frame 41 may be moved relative to the spark plug mounting portion 49 depending on the type of engine to be used. A pair of wall portions 43 on the side of the first connecting portion 44,
43 may come to interfere.
【０００８】これに対して、フレーム４１がプレス製で
なくロストワックス製や鍛造製のものではピボット係合
部４６の側方に前述したような金型受け用の平坦部分を
残す必要がないから、フレーム４１の第１連接部４４の
側での幅寸法を小さくできる。したがって、前述のよう
な使用対象には、このようなロストワックス製や鍛造製
のフレームを持つロッカアームを使用せざるを得なかっ
た。On the other hand, in the case where the frame 41 is made of lost wax or forging instead of being made of a press, it is not necessary to leave the flat portion for receiving the mold as described above on the side of the pivot engaging portion 46. The width dimension of the frame 41 on the side of the first connecting portion 44 can be reduced. Therefore, a rocker arm having such a frame made of lost wax or forged has been forced to be used for the above-mentioned use object.
【０００９】本発明は、上記事情に鑑み、フレームの第
１連接部の側が幅広に設定されていても、ロッカアーム
の使用対象側の点火プラグ装着部との干渉を防止できる
ようにすることを課題とする。In view of the above circumstances, it is an object of the present invention to prevent the rocker arm from interfering with the spark plug mounting portion on the side to be used even when the first connecting portion side of the frame is set wide. And
【００１０】[0010]
【課題を解決するための手段】本発明は、プレス製のフ
レームにローラを回転自在に支持するロッカアームにお
いて、フレームが、対向配置されて長手方向中間にロー
ラが軸支される一対の壁部と、この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半球状の
ピボット係合部が壁部側に所要幅の余裕を残すように設
けられる第１連接部と、一対の壁部の長手方向他端側で
それらの間に架橋状に連接されかつ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第２連接部とを備
え、かつ、一対の壁部の長手方向における第１連接部側
の端縁が、第１連接部のピボット係合部の中心寄りに位
置するように設定されている構成とした。According to the present invention, in a rocker arm for rotatably supporting a roller on a frame made of a press, the frames are arranged so as to face each other and a pair of wall portions axially supporting the roller are provided. A first connecting portion that is connected in a bridge shape between the pair of wall portions at one end side in the longitudinal direction and has a hemispherical pivot engagement portion provided on the wall portion side so as to leave a margin of a required width, A second coupling portion for valve engagement, which is connected in a bridging manner between the other end portions in the longitudinal direction of the pair of wall portions and is curved and molded along the longitudinal direction of the wall portion; The end edge of the portion on the side of the first connecting portion in the longitudinal direction is set so as to be located closer to the center of the pivot engaging portion of the first connecting portion.
【００１１】[0011]
【作用】本発明では、要するに、一対の壁部の長手方向
において第１連接部の側の端縁がピボット係合部の中心
側へと後退されて一対の壁部の長手方向寸法を従来より
も短く設定しているから、フレームの第１連接部の側を
半球状のピボット係合部の形成に関連して幅広に設定し
ていても、フレームの第１連接部の側での幅方向外側へ
の張り出し量を小さくできるようになり、このフレーム
の第１連接部の側が点火プラグ装着部と干渉するのを防
止できるようになる。According to the present invention, in short, the edges of the pair of wall portions on the side of the first connecting portion in the longitudinal direction are retracted toward the center side of the pivot engaging portion so that the longitudinal dimension of the pair of wall portions becomes larger than that of the conventional one. Since the frame is also set to be short, even if the width of the first connecting portion side of the frame is set wide in relation to the formation of the hemispherical pivot engaging portion, the width direction on the side of the first connecting portion of the frame The amount of protrusion to the outside can be reduced, and it is possible to prevent the first connecting portion side of this frame from interfering with the spark plug mounting portion.
【００１２】[0012]
【実施例】以下、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。図１ないし図３は本発明の
第１実施例に係り、図１はロッカアームの縦断側面図、
図２は同ロッカアームの斜視図、図３は同ロッカアーム
の要部の上面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS. 1 to 3 relate to a first embodiment of the present invention, and FIG. 1 is a vertical sectional side view of a rocker arm,
FIG. 2 is a perspective view of the rocker arm, and FIG. 3 is a top view of a main part of the rocker arm.
【００１３】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、ローラ３と軸４との間にニードルロー
ラ軸受を介在してもよい。The rocker arm 1 of the illustrated example has a structure in which a roller 3 is rotatably attached to a press-made frame 2 via a shaft 4. A needle roller bearing may be interposed between the roller 3 and the shaft 4.
【００１４】フレーム２は、断面逆Ｕ字形で単一の部材
からなるワンピース構造であり、ほぼ平行に対向配置さ
れる垂下状の一対の壁部６、６と、一対の壁部６、６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半
球状のピボット係合部９が壁部６、６側に所要幅Ｄの平
坦部分を残すように設けられる平坦な第１連接部７と、
一対の壁部６、６の長手方向他端側でそれらの間に架橋
状に連接されかつ壁部６、６の長手方向に沿って湾曲成
形されるバルブ係合用の第２連接部８とを備えている。
ピボット係合部９には、ローラ３側へ潤滑油を噴出させ
る油穴（符号省略）が設けられている。なお、フレーム
２の材料としては、例えばＪＩＳ規格ＳＣＭ４１５、４
２０などのクロムモリブデン鋼、ＪＩＳ規格ＳＣｒ４２
０やＳＡＥ規格５１２０などの肌焼鋼、あるいはＪＩＳ
規格ＳＰＣ系の冷間圧延鋼板などが好適に用いられる。The frame 2 has a one-piece structure of a single member having an inverted U-shape in cross section, and has a pair of hanging wall portions 6 and 6 arranged to face each other substantially in parallel, and a pair of wall portions 6 and 6. A first flat connecting portion 7 which is connected in a bridging manner on one end side in the longitudinal direction and is provided so as to have a hemispherical pivot engaging portion 9 so as to leave a flat portion having a required width D on the wall portions 6, 6 side. When,
A second connecting portion 8 for valve engagement, which is connected in a bridging manner between the pair of wall portions 6, 6 on the other end side in the longitudinal direction, and which is curvedly formed along the longitudinal direction of the wall portions 6, 6. I have it.
The pivot engagement portion 9 is provided with an oil hole (reference numeral omitted) for ejecting lubricating oil toward the roller 3 side. The material of the frame 2 is, for example, JIS standard SCM415, 4
Chrome molybdenum steel such as 20, JIS standard SCr42
0 or case hardening steel such as SAE standard 5120, or JIS
A standard SPC cold rolled steel sheet or the like is preferably used.
【００１５】ローラ３は、一対の壁部６、６の孔６０、
６０間に架け渡される軸４を介して回転自在に支持され
て、フレーム２の貫通孔１０内に配置されている。この
ローラ３は、鋼材（例えばＪＩＳ規格のＳＵＪ−２）ま
たは窒化けい素を主体とするセラミックスで形成され
る。The roller 3 has a pair of walls 6, holes 60 in the wall 6,
It is rotatably supported via a shaft 4 spanned between 60 and arranged in the through hole 10 of the frame 2. The roller 3 is made of steel (for example, JIS standard SUJ-2) or ceramics mainly composed of silicon nitride.
【００１６】このロッカアーム１は、クランク軸に連動
するカムＣの回転に伴って、ローラ３が押され、ラッシ
ュアジャスタのピボットＰが係合するピボット係合部９
を支点として上下に揺動し、第２連接部８に係合するバ
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 the rocker arm 1, the roller 3 is pushed by the rotation of the cam C interlocked with the crank shaft, and the pivot engaging portion 9 with which the pivot P of the lash adjuster is engaged.
Is used as a fulcrum to vertically swing, and the valve stem V engaging with the second connecting portion 8 is vertically moved up and down along a valve guide (not shown).
【００１７】そして、一対の壁部６、６の長手方向にお
いて第１連接部７側の端縁が、第１連接部７のピボット
係合部９の中心Ｏ寄りに位置するように設定されてい
る。換言すれば、一対の壁部６、６の長手方向において
第１連接部７の側の端縁がピボット係合部９の中心Ｏを
通るＸ−Ｘ線側へと後退されて一対の壁部６、６の長手
方向寸法が従来よりも短く設定されている。このため、
フレーム２の第１連接部７の側を半球状のピボット係合
部９の形成に関連して幅広に設定していても、フレーム
２の第１連接部７の側での幅方向外側への張り出し量を
小さくできるようになるので、ロッカアーム１が揺動す
るときに、その第１連接部７側で一対の壁部６、６が使
用対象側の点火プラグ装着部（図３の１１）に対して干
渉するのを回避できるようになる。The edges of the pair of walls 6, 6 on the side of the first connecting portion 7 in the longitudinal direction are set so as to be located closer to the center O of the pivot engaging portion 9 of the first connecting portion 7. There is. In other words, in the longitudinal direction of the pair of wall portions 6, 6, the edge of the first connecting portion 7 side is retracted to the XX line side that passes through the center O of the pivot engaging portion 9, and the pair of wall portions is formed. The lengthwise dimensions of 6 and 6 are set shorter than before. For this reason,
Even if the side of the first connecting portion 7 of the frame 2 is set wide in relation to the formation of the hemispherical pivot engaging portion 9, the side of the first connecting portion 7 of the frame 2 toward the outer side in the width direction is set. Since the amount of overhang can be reduced, when the rocker arm 1 swings, the pair of walls 6, 6 on the side of the first connecting portion 7 thereof becomes the spark plug mounting portion (11 in FIG. 3) on the side to be used. It becomes possible to avoid interfering with each other.
【００１８】このように、第１連接部７において半球状
のピボット係合部９と一対の壁部６、６との間に成形金
型受け用の所要幅Ｄの平坦部分を残してピボット係合部
９を高精度に絞り成形できるようにしたことが原因で、
フレーム２の第１連接部７の側が幅広になっていても、
前述したように点火プラグ装着部１１と干渉させないよ
うにできる。As described above, in the first connecting portion 7, the pivot engaging portion 9 is left between the hemispherical pivot engaging portion 9 and the pair of wall portions 6 and 6, leaving a flat portion having a required width D for receiving the molding die. Due to the fact that the joint 9 can be drawn with high precision,
Even if the side of the first connecting portion 7 of the frame 2 is wide,
As described above, it is possible not to interfere with the spark plug mounting portion 11.
【００１９】なお、第１連接部７の長手方向端縁角部
は、矩形に角張っている必要はなく、ピボット係合部９
の成形の際に金型受け用の所要幅Ｄをピボット係合部９
の周囲に確保できればよいので、ピボット係合部９に沿
った円弧状にしてもよい。この場合には、さらに点火プ
ラグ装着部１１との干渉を余裕をもって回避することが
できる。It should be noted that the longitudinal edge corners of the first connecting portion 7 do not have to be rectangular in shape, and the pivot engaging portion 9 is not necessary.
The required width D for receiving the die during the molding of the pivot engaging portion 9
As long as it can be secured around the circumference, it may be formed in an arc shape along the pivot engaging portion 9. In this case, it is possible to avoid interference with the spark plug mounting portion 11 with a margin.
【００２０】また、上述したように一対の壁部６、６に
おいて第１連接部７の側を短くしても、壁部６、６の剛
性については十分確保できるようになっている。但し、
一対の壁部６、６の第１連接部７の側の端縁がピボット
係合部９の中心Ｏを通るＸ−Ｘ線を越えてローラ３側へ
位置するように設定されると、壁部６、６の剛性が不足
すると考えられるので、第１連接部７の側の端縁がピボ
ット係合部９の中心Ｏを通るＸ−Ｘ線を越えないように
設定するのが好ましい。Further, as described above, even if the side of the first connecting portion 7 of the pair of wall portions 6 and 6 is shortened, the rigidity of the wall portions 6 and 6 can be sufficiently secured. However,
When the end edges of the pair of wall portions 6, 6 on the side of the first connecting portion 7 are set so as to be located on the roller 3 side beyond the XX line passing through the center O of the pivot engaging portion 9, the wall is set. Since it is considered that the rigidity of the portions 6 and 6 is insufficient, it is preferable to set so that the edge on the side of the first connecting portion 7 does not exceed the XX line passing through the center O of the pivot engaging portion 9.
【００２１】図４ないし図６は本発明の第２実施例に係
り、図４はロッカアームの縦断側面図、図５は同ロッカ
アームの平面図、図６は同ロッカアームの上面図であ
る。この実施例では、フレーム２が断面Ｕ字形でワンピ
ース構造とされるタイプのロッカアーム１を例に挙げて
いる。この実施例のロッカアーム１は、一対の壁部６、
６が第１連接部７および第２連接部８の位置から立ち上
がっている点、一対の壁部６、６の長手方向の幅が３段
階に変化している点など外観形状が上記第１実施例と若
干異なるが、基本的な構成においては上記第１実施例と
同じである。また、この実施例ではローラ３と軸４との
間にニードルローラ軸受５を介装してあるが、これは省
略してもよい。4 to 6 relate to a second embodiment of the present invention. FIG. 4 is a vertical sectional side view of a rocker arm, FIG. 5 is a plan view of the rocker arm, and FIG. 6 is a top view of the rocker arm. In this embodiment, the rocker arm 1 of the type in which the frame 2 has a U-shaped cross section and has a one-piece structure is taken as an example. The rocker arm 1 of this embodiment includes a pair of wall portions 6,
The outer shape of the first embodiment is such that 6 stands up from the positions of the first connecting portion 7 and the second connecting portion 8 and the width of the pair of wall portions 6 in the longitudinal direction changes in three steps. Although slightly different from the example, the basic configuration is the same as that of the first embodiment. Further, in this embodiment, the needle roller bearing 5 is interposed between the roller 3 and the shaft 4, but this may be omitted.
【００２２】前述の外観形状の相違のうち、一対の壁部
６、６の第２連接部８の側を最も幅狭に設定しているの
は、ここに係合されるバルブステムＶのがたつきを抑制
することを考慮しており、一対の壁部６、６の第１連接
部７の側を最も幅広に設定しているのは、半球状のピボ
ット係合部９と一対の壁部６、６との間に絞り成形時の
金型受けとなる所要幅Ｄの平坦部分を設けてピボット係
合部９の成形精度を確保することを考慮している。そし
て、壁部６、６においてローラ３近傍の部位について
は、全体の軽量、コンパクト化を考慮して、第１連接部
７側よりも幅狭としている。Among the above-mentioned differences in external shape, the side where the second connecting portion 8 of the pair of wall portions 6, 6 is set to have the narrowest width is that the valve stem V engaged therewith is In consideration of suppressing the rattling, the hemispherical pivot engaging portion 9 and the pair of walls are set so that the first connecting portion 7 side of the pair of wall portions 6 and 6 is widest. It is considered to secure the molding accuracy of the pivot engaging portion 9 by providing a flat portion having a required width D between the portions 6 and 6 which serves as a die receiver during drawing. The wall portions 6, 6 in the vicinity of the roller 3 are narrower than the first connecting portion 7 side in consideration of overall weight reduction and size reduction.
【００２３】この第２実施例の構造においては、図７に
示すように、一対の壁部６、６において第１連接部７の
側の肉厚Ｔ2をその他の部分の肉厚Ｔ1より薄く設定し
て、一対の壁部６、６において第２連接部８の側を除く
部位の外側面を面一にすることもできる。この壁部６、
６の局部的な薄肉化は、圧延、鍛圧もしくは切削等によ
り行える。この薄肉化は、フレーム２の加工前の母材打
ち抜き段階において行うのが製作上において有利となる
が、打ち抜いた母材をＵ字形に曲げ加工した後に行って
もよい。このようにすれば、フレーム２の第１連接部７
の側での外向き張り出し量を小さくできるので、両壁部
６、６の第１連接部７の側の端縁を第１実施例の場合よ
り延ばしたとしても点火プラグ装着部１１との干渉を回
避できるようになり、結果的に、壁部６、６の長手方向
寸法を第１実施例の場合に比べて少しでも長くできて高
剛性にできる。In the structure of the second embodiment, as shown in FIG. 7, the wall thickness T 2 of the pair of walls 6, 6 on the first connecting portion 7 side is smaller than the wall thickness T 1 of the other portions. It is also possible to set the thickness to be thin so that the outer surfaces of the pair of walls 6, 6 excluding the second connecting portion 8 side are flush with each other. This wall 6,
The local thinning of No. 6 can be performed by rolling, forging pressure or cutting. It is advantageous in manufacturing that the thinning is performed in the base material punching step before the processing of the frame 2, but it may be performed after the punched base material is bent into a U-shape. In this way, the first connecting portion 7 of the frame 2
Since the amount of outward protrusion on the side of can be reduced, even if the edges of both walls 6, 6 on the side of the first connecting portion 7 are made longer than in the case of the first embodiment, they interfere with the spark plug mounting portion 11. As a result, the dimension of the walls 6, 6 in the longitudinal direction can be made slightly longer than in the case of the first embodiment, and high rigidity can be achieved.
【００２４】なお、上記第１、第２実施例の構造におい
て、第１連接部７を、壁部６、６および第２連接部８と
別体に形成して両者を溶接などで固着するいわゆるツー
ピース構造としたものも本発明に含まれる。このように
第１連接部７を別体とする場合においては、第１連接部
７の前後形状を異なるよう、すなわち各図に示されるよ
うに、長手方向端縁の角部を曲面にする一方ローラ３側
の角部を矩形に角張るように設計することで当該第１連
接部７の誤装着を防止できるようになる。In the structures of the first and second embodiments, the so-called first connecting portion 7 is formed separately from the wall portions 6 and 6 and the second connecting portion 8 and both are fixed by welding or the like. A two-piece structure is also included in the present invention. When the first connecting portion 7 is formed as a separate body as described above, the front and rear shapes of the first connecting portion 7 may be different, that is, as shown in the drawings, the corners of the longitudinal edges may be curved. By designing the corners on the roller 3 side to be rectangular, it is possible to prevent erroneous mounting of the first connecting portion 7.
【００２５】[0025]
【発明の効果】以上述べたように、本発明では、第１連
接部において壁部側に平坦部分を設けるようにして半球
状のピボット係合部を形成することが原因でフレームの
第１連接部の側が幅広になっていても、一対の壁部にお
いて第１連接部の側を従来からの一般的なものに比べて
短くすることにより、フレームの第１連接部の側におけ
る幅方向外側への張り出し量を小さくしているから、ロ
ッカアームの揺動動作時に一対の壁部において第１連接
部の側が使用対象側の点火プラグに対して干渉するのを
防止することができる。As described above, in the present invention, the first connecting portion of the frame is formed by forming the hemispherical pivot engaging portion by providing the flat portion on the wall portion side in the first connecting portion. Even if the side of the portion is wide, by making the side of the first connecting portion of the pair of wall portions shorter than that of a general conventional one, it is possible to move the side of the frame toward the outer side in the width direction on the side of the first connecting portion. Since the protruding amount of the rocker arm is small, it is possible to prevent the side of the first connecting portion of the pair of walls from interfering with the spark plug on the side of the object of use during the rocking operation of the rocker arm.
【００２６】したがって、本発明のロッカアームは、前
述したように点火プラグとの干渉を確実に防止すること
ができるので、どのような使用対象にも適用できるよう
になる。Therefore, the rocker arm of the present invention can reliably prevent the interference with the spark plug as described above, and can be applied to any intended use.
【図１】本発明の第１実施例に係るロッカアームの縦断
側面図。FIG. 1 is a vertical sectional side view of a rocker arm according to a first embodiment of the present invention.
【図２】第１実施例のロッカアームの斜視図。FIG. 2 is a perspective view of a rocker arm of the first embodiment.
【図３】第１実施例のロッカアームの要部の上面図。FIG. 3 is a top view of the essential parts of the rocker arm of the first embodiment.
【図４】本発明の第２実施例に係るロッカアームの縦断
側面図。FIG. 4 is a vertical sectional side view of a rocker arm according to a second embodiment of the present invention.
【図５】第２実施例のロッカアームの斜視図。FIG. 5 is a perspective view of a rocker arm according to a second embodiment.
【図６】第２実施例のロッカアームの上面図。FIG. 6 is a top view of the rocker arm of the second embodiment.
【図７】第２実施例のロッカアームの変形例の斜視図。FIG. 7 is a perspective view of a modified example of the rocker arm of the second embodiment.
【図８】従来例のロッカアームの縦断側面図。FIG. 8 is a vertical sectional side view of a conventional rocker arm.
【図９】従来例のロッカアームの斜視図。FIG. 9 is a perspective view of a conventional rocker arm.
【図１０】従来例のロッカアームの要部の上面図。FIG. 10 is a top view of a main part of a conventional rocker arm.
１ ロッカアーム ２ フレーム ３ ローラ ４ ローラ支持用の軸 ６ フレームの壁部 ７ フレームの第１連接部 ８ フレームの第２連接部 ９ 第１連接部のピボット係合部 1 Rocker Arm 2 Frame 3 Roller 4 Shaft for Roller Support 6 Wall Part of Frame 7 First Connection Part of Frame 8 Second Connection Part of Frame 9 Pivot Engagement Part of First Connection Part
Claims (1)
に支持するロッカアームであって、 フレームが、対向配置されて長手方向中間にローラが軸
支される一対の壁部と、この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半球状のピボッ
ト係合部が壁部側に所要幅の余裕を残すように設けられ
る第１連接部と、一対の壁部の長手方向他端側でそれら
の間に架橋状に連接されかつ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第２連接部とを備え、 かつ、一対の壁部の長手方向における第１連接部側の端
縁が、第１連接部のピボット係合部の中心寄りに位置す
るように設定されている、ことを特徴とするロッカアー
ム。1. A rocker arm for rotatably supporting a roller on a frame made of a press, the frame being opposed to each other, and having a pair of wall portions axially supporting the roller, and the pair of wall portions. A longitudinal direction of the pair of wall portions, and a first connecting portion that is connected in a bridge shape between them on one end side in the longitudinal direction and has a hemispherical pivot engagement portion provided to leave a margin of a required width on the wall side. And a second connecting portion for valve engagement, which is connected in a bridging manner between them on the other end side in the direction and is curved and molded along the longitudinal direction of the wall portion, and the first connecting portion in the longitudinal direction of the pair of wall portions. The rocker arm is characterized in that an end edge on the side of the first connecting portion is set so as to be located closer to the center of the pivot engaging portion of the first connecting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02246394A JP3362139B2 (en) | 1994-02-21 | 1994-02-21 | Rocker arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02246394A JP3362139B2 (en) | 1994-02-21 | 1994-02-21 | Rocker arm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07229407A true JPH07229407A (en) | 1995-08-29 |
| JP3362139B2 JP3362139B2 (en) | 2003-01-07 |
Family
ID=12083404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02246394A Expired - Fee Related JP3362139B2 (en) | 1994-02-21 | 1994-02-21 | Rocker arm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3362139B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003097226A (en) * | 2001-09-21 | 2003-04-03 | Koyo Seiko Co Ltd | Rocker arm and method of forming oil hole in pivot portion in the rocker arm |
| US6601555B2 (en) | 1998-03-12 | 2003-08-05 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
| JP2007032475A (en) * | 2005-07-28 | 2007-02-08 | Otics Corp | Rocker arm |
| DE102008046186A1 (en) | 2008-09-06 | 2010-03-11 | Schaeffler Kg | Cam follower for valve train for controlling gas cycle of internal combustion engine, has bowl-shaped calotte receptacle at end, where side walls are provided with longitudinally extending chamfers in area of calotte receptacle |
| US7836860B2 (en) | 2007-11-21 | 2010-11-23 | Charter Manufacturing Co., Inc. | Engine rocker arm |
| DE10341885B4 (en) | 2002-09-09 | 2019-06-13 | Ntn Corporation | rocker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50146561A (en) * | 1974-05-17 | 1975-11-25 |
-
1994
- 1994-02-21 JP JP02246394A patent/JP3362139B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50146561A (en) * | 1974-05-17 | 1975-11-25 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6601555B2 (en) | 1998-03-12 | 2003-08-05 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
| US6672266B2 (en) | 1998-03-12 | 2004-01-06 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
| JP2003097226A (en) * | 2001-09-21 | 2003-04-03 | Koyo Seiko Co Ltd | Rocker arm and method of forming oil hole in pivot portion in the rocker arm |
| DE10341885B4 (en) | 2002-09-09 | 2019-06-13 | Ntn Corporation | rocker |
| JP2007032475A (en) * | 2005-07-28 | 2007-02-08 | Otics Corp | Rocker arm |
| US7836860B2 (en) | 2007-11-21 | 2010-11-23 | Charter Manufacturing Co., Inc. | Engine rocker arm |
| DE102008046186A1 (en) | 2008-09-06 | 2010-03-11 | Schaeffler Kg | Cam follower for valve train for controlling gas cycle of internal combustion engine, has bowl-shaped calotte receptacle at end, where side walls are provided with longitudinally extending chamfers in area of calotte receptacle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3362139B2 (en) | 2003-01-07 |
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