JP2001012248A - Governor mechanism - Google Patents

Governor mechanism

Info

Publication number
JP2001012248A
JP2001012248A JP11179733A JP17973399A JP2001012248A JP 2001012248 A JP2001012248 A JP 2001012248A JP 11179733 A JP11179733 A JP 11179733A JP 17973399 A JP17973399 A JP 17973399A JP 2001012248 A JP2001012248 A JP 2001012248A
Authority
JP
Japan
Prior art keywords
governor
cam body
engine
shaft
spring
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
Application number
JP11179733A
Other languages
Japanese (ja)
Inventor
Megumi Iwakiri
惠 岩切
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Heavy Industries Ltd filed Critical Kawasaki Heavy Industries Ltd
Priority to JP11179733A priority Critical patent/JP2001012248A/en
Publication of JP2001012248A publication Critical patent/JP2001012248A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Landscapes

  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a governor mechanism used for an exhaust control device of an engine and to maintain output in an intermediate rotational region of the engine at a high value. SOLUTION: A fixed cam body 4 is fastened on a governor shaft 3 to rotate by being connected to a crankshaft 2 of an engine, and a movable cam body 5 is fitted on the governor shaft 3 free to move in the axial direction. A plural number of centrifugal weights 6 are clamped between these cam bodies 4, 5. The movable cam body 5 is energized to the side of the fixed cam body 4 by arranging springs 8, 9 which are coil springs of the roughly same shaft center as the governor shaft 3 on the outer peripheral side of the governor shaft 3. The springs 8, 9 are plural and different in winding diameter, and the small diametrical side 9 is arranged inside in the diametrical direction of the large diametrical side 8.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、2サイクルエンジ
ン等の排気制御装置に用いられるガバナ機構に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a governor mechanism used for an exhaust control device of a two-stroke engine or the like.

【0002】[0002]

【従来の技術】この種の従来のガバナ機構(特公平3−
24563号公報,特公平6−5014号公報等)の一
例を図4に示す。このガバナ機構では、エンジンのクラ
ンク軸の回転が伝達されるガバナ軸31に固着された固
定カム体32と、前記ガバナ軸31に軸方向移動自在に
嵌合された移動カム体33とで、複数の遠心ボール34
が挟持され、前記ガバナ軸31に固着されたスプリング
ホルダ35と前記移動カム体33との間に配置されたコ
イルスプリングからなるガバナスプリング36により、
移動カム体33が前記固定カム体32側に付勢されてい
る。ガバナ軸31の軸方向への移動カム体33の移動
は、図示しない伝達機構および弁開閉機構を介して排気
制御弁に伝達され、エンジンの回転数に応じて排気制御
弁の開度が制御される。
2. Description of the Related Art A conventional governor mechanism of this kind (Japanese Patent Publication No.
FIG. 4 shows an example of the method disclosed in Japanese Patent Publication No. 24563 and Japanese Patent Publication No. 6-5014. In this governor mechanism, a fixed cam body 32 fixed to a governor shaft 31 to which the rotation of the crankshaft of the engine is transmitted, and a movable cam body 33 fitted to the governor shaft 31 so as to be movable in the axial direction, have a plurality of parts. Centrifugal ball 34
And a governor spring 36 composed of a coil spring disposed between the spring holder 35 fixed to the governor shaft 31 and the movable cam body 33.
The movable cam 33 is biased toward the fixed cam 32. The movement of the movable cam body 33 in the axial direction of the governor shaft 31 is transmitted to the exhaust control valve via a transmission mechanism and a valve opening / closing mechanism (not shown), and the opening degree of the exhaust control valve is controlled according to the engine speed. You.

【0003】一般に、高速型の2サイクルエンジンで
は、図2の出力特性図に示すように、排気制御弁12を
全閉のままにした場合には、高速回転域で符合(3)の
特性線のように十分な出力が得られず、逆に、排気制御
弁12を全開のままにした場合には、中速回転域に下が
ったところで符合(2)の特性線のように十分な出力が
得られない。
In general, in a high-speed two-stroke engine, as shown in an output characteristic diagram of FIG. 2, when the exhaust control valve 12 is kept fully closed, a characteristic line (3) in a high-speed rotation region is obtained. In contrast, when the exhaust control valve 12 is left fully open, a sufficient output like the characteristic line (2) is obtained when the exhaust control valve 12 is lowered to the middle speed range. I can't get it.

【0004】前記ガバナ機構によれば、エンジンが低速
回転時には、遠心ボール34の外方への移動量が殆どな
く、カム作用により移動カム体33がガバナスプリング
36の弾性力に抗して矢印R方向に移動する移動量も殆
どなく、排気制御弁の開度が小さく抑えられる(排気ポ
ートの上部を閉じたままとしている。)。また、エンジ
ンが中高速回転になると、遠心ボール34の外側への移
動量が大きくなるので、移動カム体33の矢印R方向へ
の移動量も大きくなり、排気制御弁の開度が大きくな
る。このようにして、排気制御弁の開度がエンジン回転
数に応じて制御され、実線および符号(4)の特性線の
ように、低速から中速、高速回転時にわたって十分な出
力が得られる。
According to the governor mechanism, when the engine is rotating at a low speed, the centrifugal ball 34 hardly moves outward, and the cam action causes the moving cam body 33 to oppose the elastic force of the governor spring 36 to the arrow R. There is almost no amount of movement in the direction, and the opening of the exhaust control valve is kept small (the upper part of the exhaust port is kept closed). In addition, when the engine rotates at a high speed, the amount of movement of the centrifugal ball 34 to the outside increases, so that the amount of movement of the moving cam body 33 in the direction of arrow R also increases, and the opening of the exhaust control valve increases. In this way, the opening of the exhaust control valve is controlled according to the engine speed, and a sufficient output can be obtained from low speed to medium speed and high speed rotation as indicated by the solid line and the characteristic line (4).

【0005】[0005]

【発明が解決しようとする課題】ところで、前記従来例
のガバナ機構において、ガバナ軸31と略同一軸心で配
置された1つのコイルスプリングからなるガバナスプリ
ング36は、エンジンの低中速回転時に移動カム体33
の矢印R方向への移動を適切に抑えるために、そのばね
定数kはかなり大きい値が要求される。ばね定数kは、
次式 k=Gd4 /8Na 3 ただし、 d:コイルスプリングの線径 D:コイルスプリングの巻径(コイル平均径) Na :巻数(有効巻数) G:コイルスプリングの材料の横弾性係数 で表されるが、スペース等の関係で巻径Dは制限され、
横弾性係数Gも材料により決まるので、ばね定数kを大
きくするには、線径dを適切に設定することになり、結
果的に巻数Na を今一つ十分大きく取れない。
By the way, in the governor mechanism of the prior art, the governor spring 36 composed of one coil spring disposed substantially at the same axis as the governor shaft 31 moves when the engine is running at low and medium speeds. Cam body 33
In order to appropriately suppress the movement in the direction of arrow R, the spring constant k is required to have a considerably large value. The spring constant k is
Equation k = Gd 4 / 8N a D 3 , however, d: the coil spring wire diameter D: the coil spring winding diameter (coil average diameter) N a: turns (effective turns) G: modulus of transverse elasticity of the coil spring material , But the winding diameter D is limited due to space and other factors.
Since modulus of rigidity G is also determined by the material, in order to increase the spring constant k becomes possible to appropriately set the wire diameter d, one more not take a sufficiently large resulting in turns N a.

【0006】そうすると、ばね定数kは確保できても、
巻数Na が大きい場合に比べて、同じ応力に対するコイ
ルスプリングの1巻当たりの縮み量が大きくなり、実際
に働く応力がコイルスプリングの連続的な使用での許容
応力範囲外となり得る。その結果、エンジンの中速回転
域において、初期的には図2の符号(4)のような出力
特性を発揮できるが、短期間のうちにガバナスプリング
36にいわゆる「へたり」が生じて自由長が短くなり、
移動カム体33を固定カム体32側に今一つ十分に付勢
できず、中速回転域での移動カム体33の矢印R方向へ
の移動がより低い回転で起こり、排気制御弁12(図
3)が後退(開くともいう。)して、図2の符号(5)
のようにエンジン出力がやや低下することになる。な
お、この従来例のガバナ機構では、ガバナスプリング3
6のへたりによる中速回転域での出力低下を防止するた
めに、移動カム体33のカム面に、遠心ボール34の外
側への移動を制限する段部33aが形成されている。
Then, even if the spring constant k can be secured,
As compared with the case the number of turns N a is large, the greater the shrinkage amount per volume of the coil spring for the same stress, the stress actually acts may be allowable stress range for a continuous use of the coil spring. As a result, in the middle speed region of the engine, the output characteristics such as the reference numeral (4) in FIG. 2 can be initially exhibited, but the governor spring 36 is so-called "sagging" within a short period of time and is free. The length becomes shorter,
The moving cam body 33 cannot be sufficiently urged toward the fixed cam body 32 side, and the movement of the moving cam body 33 in the direction of arrow R in the medium speed rotation region occurs at a lower rotation, and the exhaust control valve 12 (FIG. ) Is retracted (also called open), and the reference numeral (5) in FIG.
, The engine output will be slightly reduced. In this conventional governor mechanism, the governor spring 3
In order to prevent the output from dropping in the medium speed rotation region due to the settling, a step portion 33a for restricting the movement of the centrifugal ball 34 to the outside is formed on the cam surface of the movable cam body 33.

【0007】本発明は、以上の事情に鑑みてなされたも
ので、エンジンの中速回転域での出力を高い値に維持で
きるガバナ機構を提供することを目的とする。
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a governor mechanism capable of maintaining a high output in an intermediate speed range of an engine.

【0008】[0008]

【課題を解決するための手段】前記した目的を達成する
ために、本発明の請求項1に係るガバナ機構は、エンジ
ンの排気制御装置に用いられるものであって、エンジン
のクランク軸に連結されて回転するガバナ軸と、そのガ
バナ軸に固着された固定カム体と、前記ガバナ軸に軸方
向移動自在に嵌合された移動カム体と、前記ガバナ軸の
外周側にガバナ軸と略同一軸心で配置されたコイル状の
スプリングであって、前記移動カム体を前記固定カム体
側に付勢するスプリングと、前記固定カム体と移動カム
体に挟持される複数の遠心錘とを備え、前記スプリング
が複数で巻径が相異なり、小径側が大径側の径方向内側
に配置されている。
In order to achieve the above object, a governor mechanism according to a first aspect of the present invention is used in an exhaust control device of an engine, and is connected to a crankshaft of the engine. A governor shaft, a fixed cam body fixed to the governor shaft, a movable cam body fitted to the governor shaft so as to be movable in the axial direction, and a shaft substantially coaxial with the governor shaft on the outer peripheral side of the governor shaft. A coil-shaped spring disposed at a center, comprising: a spring for biasing the movable cam body toward the fixed cam body; and a plurality of centrifugal weights sandwiched between the fixed cam body and the movable cam body. A plurality of springs have different winding diameters, and the smaller diameter side is disposed radially inward of the larger diameter side.

【0009】請求項1のガバナ機構によれば、ガバナ軸
の外周側にガバナ軸と略同一軸心で巻径の異なる複数の
スプリング(ガバナスプリング)を並列的に配置してい
るので、スプリング全体として十分ばね定数を大きくで
きて縮み量が小さくなるとともに、各スプリングの巻数
も小さくしなくて済むので、各スプリングの1巻当たり
の縮み量が小さくなって、各スプリングに加わる応力が
各スプリングの許容応力範囲内に十分納まることにな
り、スプリングのヘたりを防止でき、排気制御弁が排気
ガス圧により後退するのを防止して(開かないので)、
エンジンの中速回転域での出力を高い値に維持できる。
According to the governor mechanism of the first aspect, a plurality of springs (governor springs) having substantially the same axis as the governor shaft and different winding diameters are arranged in parallel on the outer peripheral side of the governor shaft. As the spring constant can be made sufficiently large and the amount of contraction decreases, and the number of turns of each spring does not need to be reduced, the amount of contraction per turn of each spring decreases, and the stress applied to each spring is reduced. It will fall well within the allowable stress range, preventing the spring from loosening, preventing the exhaust control valve from retracting due to exhaust gas pressure (because it does not open),
The output in the middle speed range of the engine can be maintained at a high value.

【0010】また、本発明の請求項2に係るガバナ機構
は、請求項1の構成において、前記スプリングが2つ
で、小径側の線径を大径側の線径よりも小さくしてい
る。
In the governor mechanism according to a second aspect of the present invention, in the configuration of the first aspect, the number of the springs is two, and the wire diameter on the small diameter side is smaller than the wire diameter on the large diameter side.

【0011】請求項2のガバナ機構によれば、例えば従
来例のガバナ機構におけるスプリングに加えて、これよ
りも線径が小さく小径に巻きやすい別のスプリングを内
径側に配置するだけで、スペースを有効に利用しつつス
プリング全体としてのばね定数が大きくなり、請求項1
の場合と同様の結果を簡単に得ることができる。
According to the governor mechanism of the second aspect, for example, in addition to the spring in the governor mechanism of the conventional example, another spring having a smaller wire diameter and easy to be wound into a smaller diameter is merely disposed on the inner diameter side to save space. 2. The spring constant of the entire spring increases while effectively utilizing the spring.
The same result as in the case of can be easily obtained.

【0012】[0012]

【発明の実施の形態】以下、本発明の好適な実施形態に
ついて図面を参照しながら説明する。図1は本発明の一
実施形態に係るガバナ機構の縦断面図と、このガバナ機
構を含むエンジンの排気制御装置の概略の構成を示すブ
ロック図とを組み合わせて示す説明図である。ガバナ機
構1は、後述するスプリングホルダ7を介してエンジン
のクランク軸2に連結されて回転するガバナ軸3を有
し、そのガバナ軸3にはほぼ円板状の固定カム体4が固
着されている。また、前記ガバナ軸3には、その軸方向
に移動自在に移動カム体5が嵌合されている。この移動
カム体5は、固定カム体4のカム面4aに対向する皿形
のカム面5aを有する。これら両カム体4,5のカム面
4a,5aにおいて、複数の遠心錘として遠心ボール6
が挟持されている。なお、遠心錘として、ボール6に代
えてローラを用いてもよい。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a longitudinal sectional view of a governor mechanism according to an embodiment of the present invention in combination with a block diagram showing a schematic configuration of an exhaust control device for an engine including the governor mechanism. The governor mechanism 1 has a governor shaft 3 that rotates while being connected to a crankshaft 2 of an engine via a spring holder 7 to be described later. The governor shaft 3 has a substantially disc-shaped fixed cam body 4 fixed thereto. I have. A moving cam body 5 is fitted to the governor shaft 3 so as to be movable in the axial direction. The movable cam body 5 has a dish-shaped cam surface 5a facing the cam surface 4a of the fixed cam body 4. On the cam surfaces 4a, 5a of the two cam bodies 4, 5, a centrifugal ball 6 as a plurality of centrifugal weights is provided.
Is pinched. Note that a roller may be used instead of the ball 6 as the centrifugal weight.

【0013】さらに、前記ガバナ軸3には、前記移動カ
ム体5を挟んで前記固定カム体4と対向する側に、スプ
リングホルダ7が固着されており、移動カム体5の前記
スプリングホルダ7と対向する端部にはスプリングホル
ダ部5bが形成されている。スプリングホルダ7の外周
には、クランク軸2側に固着された図示しないギヤと噛
み合う入力ギヤ部7aが形成されており、これによりク
ランク軸2の回転がガバナ軸3に伝達される。
Further, a spring holder 7 is fixed to the governor shaft 3 on the side opposite to the fixed cam body 4 with the movable cam body 5 interposed therebetween, and the spring holder 7 of the movable cam body 5 is fixed to the spring holder 7. A spring holder portion 5b is formed at the opposite end. An input gear portion 7a meshing with a gear (not shown) fixed to the crankshaft 2 side is formed on the outer periphery of the spring holder 7, whereby the rotation of the crankshaft 2 is transmitted to the governor shaft 3.

【0014】前記スプリングホルダ7と移動カム体5と
の間には、移動カム体5を固定カム体4側に付勢する2
つのガバナスプリング8,9が配置されている。これら
両ガバナスプリング8,9は巻径が相異なる圧縮コイル
スプリングであって、ガバナ軸3の外周側に、ガバナ軸
3と略同一軸心となるように配置され、前記スプリング
ホルダ7と移動カム体5のスプリングホルダ部5bとで
挟持される。
Between the spring holder 7 and the movable cam 5, the movable cam 5 is urged toward the fixed cam 4.
Two governor springs 8 and 9 are arranged. These two governor springs 8 and 9 are compression coil springs having different winding diameters, and are disposed on the outer peripheral side of the governor shaft 3 so as to be substantially coaxial with the governor shaft 3. The body 5 is held between the spring holder 5b.

【0015】小径側の、すなわち巻径の小さい方のガバ
ナスプリング9は、大径側の、すなわち巻径の大きい方
のガバナスプリング8の径方向内側に配置され、巻径の
小さいガバナスプリング9の線径は、巻径の大きいガバ
ナスプリング8の線径よりも小さくされている。これに
より、小さい巻径のガバナスプリング9が巻きやすく、
スプリングホルダ7と、移動カム体5との間の狭いスペ
ースに2つのガバナスプリング8,9をコンパクトに配
置できる。さらに、両ガバナスプリング8,9は、巻き
方向が同じ(例えば左巻き)で、巻数が相異なるように
設定されている。これにより、両ガバナスプリング8,
9が相互に絡むのを防止できる。言い換えれば、ガバナ
スプリング8,9の作用を有効に活用することができ
る。
The governor spring 9 on the smaller diameter side, that is, the smaller winding diameter is disposed radially inside the governor spring 8 on the larger diameter side, that is, the larger winding diameter. The wire diameter is smaller than the wire diameter of the governor spring 8 having a large winding diameter. Thereby, the governor spring 9 with a small winding diameter is easy to wind,
The two governor springs 8, 9 can be compactly arranged in a narrow space between the spring holder 7 and the movable cam body 5. Further, the governor springs 8 and 9 are set to have the same winding direction (for example, left-handed winding) and different numbers of turns. As a result, both governor springs 8,
9 can be prevented from becoming entangled with each other. In other words, the operation of the governor springs 8 and 9 can be effectively utilized.

【0016】前記ガバナ軸3の軸方向への前記移動カム
体5の移動は、伝達機構10および開閉機構11を介し
てエンジンの排気制御弁12に伝達され、移動カム体5
の移動量に応じて排気制御弁12の開度が制御される。
なお、図示はしないが、例えば、伝達機構10は往復動
を回転に、回転を往復動に変換するもの、開閉機構11
は図3に示すように回転を往復動に変換するものをい
う。
The movement of the moving cam body 5 in the axial direction of the governor shaft 3 is transmitted to an exhaust control valve 12 of the engine via a transmission mechanism 10 and an opening / closing mechanism 11, and the moving cam body 5
The opening of the exhaust control valve 12 is controlled in accordance with the amount of movement of the exhaust control valve 12.
Although not shown, for example, the transmission mechanism 10 converts the reciprocating motion into rotation and converts the rotation into reciprocating motion.
Means that the rotation is converted into reciprocation as shown in FIG.

【0017】このガバナ機構1が用いられるエンジンの
排気制御装置の低速回転時における排気通路43の状態
を示すシリンダ41の縦断面を図3に示す。シリンダ4
1内には、排気ポート42を介して排気通路43が連通
しており、排気ポート42は高速回転時に高出力が得ら
れる排気タイミングの位置に開口している。排気通路4
3の上部には、排気通路43に向け斜め下方に貫通する
スライド孔49が設けられており、その上半部には、排
気通路43内に進退することにより、ピストン(図示せ
ず)による排気通路43の開閉タイミングを調整して排
気通路43からの排気Gの状態(排出タイミング)を変
化させる板状の排気制御弁12が、スライド移動自在に
挿入されている。
FIG. 3 shows a vertical cross section of the cylinder 41 showing the state of the exhaust passage 43 when the exhaust control device of the engine using the governor mechanism 1 rotates at a low speed. Cylinder 4
An exhaust passage 43 communicates with the inside 1 through an exhaust port 42, and the exhaust port 42 is opened at a position of an exhaust timing at which a high output is obtained during high-speed rotation. Exhaust passage 4
A slide hole 49 penetrating obliquely downward toward the exhaust passage 43 is provided at the upper part of the exhaust passage 3, and the upper half thereof is moved into and out of the exhaust passage 43, so that exhaust by a piston (not shown) is performed. A plate-shaped exhaust control valve 12 that adjusts the opening / closing timing of the passage 43 to change the state (discharge timing) of the exhaust G from the exhaust passage 43 is slidably inserted.

【0018】排気制御弁12の下方には、キャップバル
ブ52が配置されて、その中間部を支軸53により回転
可能に支持されている。キャップバルブ52の先端側の
下面は、排気制御弁12がスライド孔49内に退避した
際すなわち高速回転時(排気制御弁12の全開時)に、
排気通路43における排気ポート42の近くの上壁に沿
って位置して、スライド孔49を塞ぎ、排気通路43の
滑らかな内壁面の一部を形成する形状になっている。
A cap valve 52 is disposed below the exhaust control valve 12, and an intermediate portion thereof is rotatably supported by a support shaft 53. When the exhaust control valve 12 retreats into the slide hole 49, that is, at the time of high-speed rotation (when the exhaust control valve 12 is fully open),
The exhaust passage 43 is located along the upper wall near the exhaust port 42, closes the slide hole 49, and forms a part of a smooth inner wall surface of the exhaust passage 43.

【0019】図1の前記ガバナ軸3の軸方向への前記移
動カム体5の移動は、図示しない伝達機構10を介し
て、図3の排気制御弁12の右下方において紙面垂直方
向を軸方向とする回転駆動軸73の回転として伝達され
る。回転駆動軸73には、固定ねじ80により回動アー
ム79が固定されている。回動アーム79は爪状のアー
ム部79cを有し、その下面に排気制御弁12の後端に
挿通して固着された係合ピン81が当接している。一
方、回動アーム79のアーム部79cの上面には、ねじ
りコイルスプリング90の一端が当接し、そのコイル部
分に回転駆動軸73が挿通されており、他端はばね力を
もって係合ピン81に下方から当接している。すなわ
ち、係合ピン81は、回動アーム79とねじりコイルス
プリング90に挟持されている。このように、回転駆動
軸73、回動アーム79、ねじりコイルスプリング90
および係合ピン81は、前記開閉機構11を構成してい
る。
The movement of the movable cam body 5 in the axial direction of the governor shaft 3 in FIG. 1 is performed by a transmission mechanism 10 (not shown) in the axial direction in the lower right direction of the exhaust control valve 12 in FIG. Is transmitted as rotation of the rotation drive shaft 73. A rotation arm 79 is fixed to the rotation drive shaft 73 by a fixing screw 80. The rotating arm 79 has a claw-shaped arm portion 79c, and an engagement pin 81 fixedly inserted through the rear end of the exhaust control valve 12 is in contact with a lower surface thereof. On the other hand, one end of a torsion coil spring 90 is in contact with the upper surface of the arm portion 79c of the rotating arm 79, and the rotation drive shaft 73 is inserted through the coil portion, and the other end is connected to the engaging pin 81 with spring force. It is in contact from below. That is, the engagement pin 81 is sandwiched between the rotating arm 79 and the torsion coil spring 90. Thus, the rotation drive shaft 73, the rotation arm 79, the torsion coil spring 90
The engagement pin 81 constitutes the opening / closing mechanism 11.

【0020】ガバナ機構1(図1)、伝達機構10(図
示せず)、開閉機構11および排気制御弁12は、エン
ジンの低速回転時には、図3のように、排気制御弁12
の円弧状の先端面12cがシリンダ1の内壁面に沿った
位置で停止して、排気ポート42の上部が閉じられるよ
うに設定されている。このとき、キャップバルブ52は
スライド孔49の下部を塞ぐ。したがって、低速回転時
には、排気ポート42の上部が閉塞される分だけ、排気
ポート43の開放タイミングが遅れるので、低速回転時
の出力が高くなる。
When the engine is running at a low speed, the governor mechanism 1 (FIG. 1), the transmission mechanism 10 (not shown), the opening / closing mechanism 11 and the exhaust control valve 12 are operated as shown in FIG.
Is stopped at a position along the inner wall surface of the cylinder 1 so that the upper part of the exhaust port 42 is closed. At this time, the cap valve 52 closes the lower part of the slide hole 49. Therefore, at the time of low-speed rotation, the opening timing of the exhaust port 43 is delayed by an amount corresponding to the closing of the upper portion of the exhaust port 42, so that the output at the time of low-speed rotation increases.

【0021】エンジンの回転速度が高まると、それに応
じて、図1のガバナ機構1においてガバナ軸3の軸方向
へ移動カム体5が移動し、その移動が図示しない伝達機
構10を介して、図3の回転駆動軸73の右回り(矢印
A)の回転として伝わり、回動アーム79とねじりコイ
ルスプリング90に挟持された係合ピン81が右方向へ
移動し、排気制御弁12が後端側へスライド移動し、す
なわち排気ポート42からスライド孔49内に退避して
開度が大きくなり、所定の回転速度で全開となる。この
とき、キャップバルブ52の先端側の下面は、排気通路
43の内壁面に沿った位置となってスライド孔49を塞
ぐ。したがって、排気通路面積が高速回転時に見合った
大きなものとなり、かつ排気のタイミングがエンジンの
回転速度に見合った早いタイミングとなって、高速回転
時の出力が向上する。
When the rotation speed of the engine increases, the moving cam body 5 moves in the axial direction of the governor shaft 3 in the governor mechanism 1 shown in FIG. 1, and the movement is transmitted via a transmission mechanism 10 (not shown). 3 is transmitted as clockwise rotation (arrow A) of the rotation drive shaft 73, the engagement pin 81 sandwiched between the rotation arm 79 and the torsion coil spring 90 moves rightward, and the exhaust control valve 12 is moved to the rear end side. , That is, retracts from the exhaust port 42 into the slide hole 49 to increase the opening degree, and is fully opened at a predetermined rotation speed. At this time, the lower surface on the distal end side of the cap valve 52 is located along the inner wall surface of the exhaust passage 43 and closes the slide hole 49. Accordingly, the area of the exhaust passage becomes large at the time of high-speed rotation, and the timing of exhaust becomes early timing corresponding to the rotation speed of the engine, so that the output at high-speed rotation is improved.

【0022】さて、図1のガバナ機構1の基本動作は、
先述した従来例の場合とほぼ同様である。すなわち、ス
プリングホルダ7の入力ギヤ部7aを介してクランク軸
2の回転がガバナ軸3に伝達され、遠心ボール6はガバ
ナ軸3の回転数に応じて遠心力を受けガバナ軸3の径方
向外側に移動する。このとき、固定カム体4および移動
カム体5のカム面4a,5aと、遠心ボール6とのカム
作用により、遠心ボール6の外側への移動量に応じて、
移動カム体5はガバナスプリング8,9の弾性力に抗し
て矢印R方向に移動する。その移動量は伝達機構10を
介して開閉機構11に伝達され、移動カム体5の移動量
に見合う分だけ、開閉機構11が排気制御弁12を開
く。
The basic operation of the governor mechanism 1 shown in FIG.
This is almost the same as the above-described conventional example. That is, the rotation of the crankshaft 2 is transmitted to the governor shaft 3 via the input gear portion 7 a of the spring holder 7, and the centrifugal ball 6 receives a centrifugal force according to the number of rotations of the governor shaft 3, and is radially outward of the governor shaft 3. Go to At this time, the cam surface 4a, 5a of the fixed cam body 4 and the moving cam body 5 and the centrifugal ball 6 act as a cam to cause the centrifugal ball 6 to move outward according to the amount of movement.
The movable cam body 5 moves in the direction of the arrow R against the elastic force of the governor springs 8 and 9. The amount of movement is transmitted to the opening / closing mechanism 11 via the transmission mechanism 10, and the opening / closing mechanism 11 opens the exhaust control valve 12 by an amount corresponding to the amount of movement of the moving cam body 5.

【0023】例えば、エンジンの低速回転時には、遠心
ボール6は殆ど外側へ移動しないので、ガバナスプリン
グ8,9に付勢されている移動カム体5は矢印Rの方向
へ殆ど移動せず、排気制御弁12の開度は小さく抑えら
れる(すなわち、排気制御弁12は全く移動しな
い。)。これにより、図3に示した排気制御弁12が排
気ポート42の上部を閉じた状態を維持できるので、エ
ンジンの低速回転域で十分な出力が得られる。また、エ
ンジンの中速、高速回転域では、その回転数に応じて図
1の遠心ボール6が外側に移動し、このときのカム作用
により、遠心ボール6の移動量に応じた量だけ、移動カ
ム体5がガバナスプリング8,9の弾性力に抗して矢印
Rの方向に移動する。この移動量に応じて、排気制御弁
12の開度が拡大されるので、エンジンの中高速回転域
でも十分な出力が得られる。
For example, when the engine is rotating at a low speed, the centrifugal ball 6 hardly moves outward, so that the moving cam body 5 urged by the governor springs 8 and 9 hardly moves in the direction of arrow R, and the exhaust control is performed. The opening of the valve 12 is kept small (that is, the exhaust control valve 12 does not move at all). Thereby, the exhaust control valve 12 shown in FIG. 3 can maintain the state in which the upper part of the exhaust port 42 is closed, and thus a sufficient output can be obtained in the low-speed rotation range of the engine. In the middle and high speed regions of the engine, the centrifugal ball 6 of FIG. 1 moves outward according to the number of revolutions, and moves by an amount corresponding to the amount of movement of the centrifugal ball 6 by the cam action at this time. The cam body 5 moves in the direction of the arrow R against the elastic force of the governor springs 8 and 9. Since the degree of opening of the exhaust control valve 12 is increased in accordance with the amount of movement, a sufficient output can be obtained even in the middle and high speed rotation range of the engine.

【0024】特に、このガバナ機構1では、ガバナ軸3
の外周側にガバナ軸と略同一軸心で巻径の異なる2つの
ガバナスプリング8,9を並列的に配置しているので、
ガバナスプリング8,9全体としてばね定数kを従来の
場合に比べて十分大きくでき、図2の出力特性図におい
て(1)で示すように、中速回転域での出力が従来の
(4)よりも向上する。
In particular, in the governor mechanism 1, the governor shaft 3
Since two governor springs 8 and 9 having substantially the same axis as the governor shaft and different winding diameters are arranged in parallel on the outer peripheral side of
The spring constant k of the governor springs 8 and 9 as a whole can be made sufficiently large as compared with the conventional case. As shown by (1) in the output characteristic diagram of FIG. Also improve.

【0025】しかも、ガバナスプリング8,9全体とし
て十分ばね定数kを大きくできて縮み量が小さくなると
ともに、各ガバナスプリング8,9の巻数Na も小さく
しなくて済むので、各ガバナスプリング8,9の1巻当
たりの縮み量が小さくなって、各ガバナスプリング8,
9に加わる応力が各ガバナスプリング8,9の許容応力
範囲内に十分納まることになり、ガバナスプリング8,
9のヘたりを防止でき、従来よりも向上したエンジンの
中速回転域での出力を長期にわたって維持できる。ま
た、ガバナスプリング8,9にへたりが生じないので、
へたりに対する補償として図4に示す従来例で行ってい
たように移動カム体5のカム面5aに遠心ボール6の外
側への移動を制限する段部などを形成する必要がなく、
部品の加工も容易になる。
[0025] Moreover, with the amount of shrinkage to be large enough spring constant k as a whole governor spring 8,9 is reduced, since it is not necessary to be smaller turns N a of the governor spring 8,9, each governor spring 8, 9, the amount of shrinkage per turn becomes smaller, and each governor spring 8,
9, the stress applied to the governor springs 8 and 9 is sufficiently within the allowable stress range of the governor springs 8 and 9.
9 can be prevented, and the output in the middle speed range of the engine, which has been improved compared to the prior art, can be maintained for a long time. Also, since there is no settling on the governor springs 8, 9,
There is no need to form a step or the like for limiting the outward movement of the centrifugal ball 6 on the cam surface 5a of the movable cam body 5 as performed in the conventional example shown in FIG.
Processing of parts becomes easier.

【0026】また、この実施形態では、ガバナスプリン
グを2つとしたが、スペースに余裕がある場合には、3
つ以上としてもよい。さらに、この実施形態では、固定
カム体4のカム面4aを円板状の平坦面としたが、図4
に示す従来例の場合のように皿形としてもよい。
In this embodiment, two governor springs are used.
There may be more than one. Further, in this embodiment, the cam surface 4a of the fixed cam body 4 is a disk-shaped flat surface.
As in the case of the conventional example shown in FIG.

【0027】[0027]

【発明の効果】以上のように、本発明のガバナ機構によ
れば、ガバナ軸の外周側にガバナ軸と略同一軸心で巻径
の異なる複数のスプリング(ガバナスプリング)を並列
的に配置しているので、スプリング全体として十分ばね
定数を大きくできて縮み量が小さくなるとともに、各ス
プリングの巻数も小さくしなくて済むので、各スプリン
グの1巻当たりの縮み量が小さくなって、各スプリング
に加わる応力が各スプリングの許容応力範囲内に十分納
まることになり、スプリングのヘたりを防止でき、エン
ジンの中速回転域での出力を高い値に維持できる。な
お、複数のスプリングの巻数を相異なるように設定した
場合には、スプリングが相互に絡むのを防止でき、スプ
リングの作用を有効に活用できる。
As described above, according to the governor mechanism of the present invention, a plurality of springs (governor springs) having substantially the same axis as the governor shaft and having different winding diameters are arranged in parallel on the outer peripheral side of the governor shaft. Therefore, the spring constant can be made sufficiently large as a whole to reduce the amount of shrinkage, and the number of turns of each spring does not have to be reduced. The applied stress is sufficiently within the allowable stress range of each spring, the spring can be prevented from being set, and the output of the engine in the middle speed region can be maintained at a high value. When the number of turns of the plurality of springs is set to be different from each other, the springs can be prevented from being entangled with each other, and the action of the springs can be effectively utilized.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施形態に係るガバナ機構の縦断面
図と、このガバナ機構を備えたエンジンの排気制御装置
のブロック図とを組み合わせて示す説明図である。
FIG. 1 is an explanatory diagram showing a longitudinal sectional view of a governor mechanism according to an embodiment of the present invention in combination with a block diagram of an exhaust control device for an engine including the governor mechanism.

【図2】同ガバナ機構によるエンジンの出力特性と、従
来のガバナ機構によるエンジンの出力特性とを比較して
示す出力特性図である。
FIG. 2 is an output characteristic diagram showing a comparison between an output characteristic of an engine by the governor mechanism and an output characteristic of an engine by a conventional governor mechanism.

【図3】同ガバナ機構が用いられるエンジンの排気制御
装置の低速回転時における排気通路の状態を示すシリン
ダの縦断面図である。
FIG. 3 is a vertical cross-sectional view of a cylinder showing a state of an exhaust passage at the time of low-speed rotation of an exhaust control device of an engine using the governor mechanism.

【図4】従来例の縦断面図である。FIG. 4 is a longitudinal sectional view of a conventional example.

【符号の説明】[Explanation of symbols]

1…ガバナ機構、2…クランク軸、3…ガバナ軸、4…
固定カム体、5…移動カム体、6…遠心錘(遠心ボー
ル)、8,9…スプリング(ガバナスプリング)。
1. governor mechanism, 2. crankshaft, 3. governor shaft, 4.
Fixed cam body, 5: movable cam body, 6: centrifugal weight (centrifugal ball), 8, 9: spring (governor spring).

─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成12年3月17日(2000.3.1
7)
[Submission date] March 17, 2000 (2003.
7)

【手続補正1】[Procedure amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】請求項1[Correction target item name] Claim 1

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【手続補正2】[Procedure amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0008[Correction target item name] 0008

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【0008】[0008]

【課題を解決するための手段】前記した目的を達成する
ために、本発明の請求項1に係るガバナ機構は、エンジ
ンの排気制御装置に用いられるものであって、エンジン
のクランク軸に連結されて回転するガバナ軸と、そのガ
バナ軸に固着された固定カム体と、前記ガバナ軸に軸方
向移動自在に嵌合された移動カム体と、その移動カム体
を挟んで前記固定カム体と対向する側で前記ガバナ軸に
固着されたスプリングホルダと、前記ガバナ軸の外周側
にガバナ軸と略同一軸心で配置され、前記移動カム体に
おいて前記スプリングホルダに対向する端部に形成され
たスプリングホルダ部と前記スプリングホルダとで挟持
されるコイル状の圧縮スプリングであって、前記移動カ
ム体を前記固定カム体側に付勢するスプリングと、前記
固定カム体と移動カム体に挟持される複数の遠心錘とを
備え、前記スプリングが複数で巻径が相異なり、小径側
が大径側の径方向内側に配置されている。
In order to achieve the above object, a governor mechanism according to a first aspect of the present invention is used in an exhaust control device of an engine, and is connected to a crankshaft of the engine. Governor shaft, a fixed cam body fixed to the governor shaft, a movable cam body fitted to the governor shaft so as to be movable in the axial direction, and the movable cam body
On the governor shaft on the side facing the fixed cam body with
And anchored spring holder, is arranged in the governor shaft substantially the same axis on the outer circumferential side of said governor shaft, said moving cam member
At the end facing the spring holder.
Between the spring holder and the spring holder
A coil-shaped compression spring, comprising: a spring for urging the movable cam body toward the fixed cam body side; and a plurality of centrifugal weights sandwiched between the fixed cam body and the movable cam body. A plurality of winding diameters are different from each other, and the smaller diameter side is disposed radially inward of the larger diameter side.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 エンジンの排気制御装置に用いられるガ
バナ機構であって、 エンジンのクランク軸に連結されて回転するガバナ軸
と、 そのガバナ軸に固着された固定カム体と、 前記ガバナ軸に軸方向移動自在に嵌合された移動カム体
と、 前記ガバナ軸の外周側にガバナ軸と略同一軸心で配置さ
れたコイル状のスプリングであって、前記移動カム体を
前記固定カム体側に付勢するスプリングと、 前記固定カム体と移動カム体に挟持される複数の遠心錘
とを備え、 前記スプリングが複数で巻径が相異なり、小径側が大径
側の径方向内側に配置されているガバナ機構。
1. A governor mechanism used in an exhaust control device of an engine, the governor shaft being connected to a crankshaft of the engine and rotating, a fixed cam body fixed to the governor shaft, and a shaft connected to the governor shaft. A moving cam body fitted movably in the direction, and a coil-shaped spring disposed on the outer peripheral side of the governor shaft at substantially the same axis as the governor shaft, wherein the moving cam body is attached to the fixed cam body side. A biasing spring, and a plurality of centrifugal weights sandwiched between the fixed cam body and the moving cam body, wherein the plurality of springs have different winding diameters, and the small diameter side is disposed radially inward of the large diameter side. Governor mechanism.
【請求項2】 請求項1において、 前記スプリングが2つで、小径側の線径が大径側の線径
よりも小さいガバナ機構。
2. The governor mechanism according to claim 1, wherein the number of the springs is two, and the wire diameter on the small diameter side is smaller than the wire diameter on the large diameter side.
JP11179733A 1999-06-25 1999-06-25 Governor mechanism Pending JP2001012248A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11179733A JP2001012248A (en) 1999-06-25 1999-06-25 Governor mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11179733A JP2001012248A (en) 1999-06-25 1999-06-25 Governor mechanism

Publications (1)

Publication Number Publication Date
JP2001012248A true JP2001012248A (en) 2001-01-16

Family

ID=16070928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11179733A Pending JP2001012248A (en) 1999-06-25 1999-06-25 Governor mechanism

Country Status (1)

Country Link
JP (1) JP2001012248A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9797275B1 (en) * 2016-06-03 2017-10-24 Timothy B. King Motorcycle engine power valve control upgrade kit
US10634035B2 (en) 2016-06-03 2020-04-28 Timothy B. King Motorcycle engine with an always spring biased open exhaust valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9797275B1 (en) * 2016-06-03 2017-10-24 Timothy B. King Motorcycle engine power valve control upgrade kit
US10634035B2 (en) 2016-06-03 2020-04-28 Timothy B. King Motorcycle engine with an always spring biased open exhaust valve
US11525383B2 (en) 2016-06-03 2022-12-13 Timothy B. King Motorcycle engine with an always spring biased open exhaust valve
US11795859B2 (en) 2016-06-03 2023-10-24 Timothy B. King Motorcycle engine with an always spring biased open exhaust valve

Similar Documents

Publication Publication Date Title
US4993376A (en) Spring system
JP4058927B2 (en) Control device for internal combustion engine
US6802287B2 (en) Valve mechanism, in particular for internal combustion engines
US9243525B2 (en) Engine valve control mechanism
JP2001012248A (en) Governor mechanism
JP5804197B2 (en) Valve mechanism for internal combustion engine and control device for valve mechanism
EP2813676B1 (en) Lash adjuster
JP2007218116A (en) Variable valve gear for engine
US10006535B2 (en) Driving force transmission system for engine
KR101736806B1 (en) Variable valve lift actuator of engine
JP2562054B2 (en) Air intake noise reduction device for internal combustion engine
JP4091709B2 (en) Variable valve operating device for internal combustion engine
US6273036B1 (en) Exhaust control valve assembly for an engine
JPH0239663B2 (en)
JP2017101651A (en) Variable valve lift device of engine
KR101716315B1 (en) Variable valve lift actuator of engine
KR100427946B1 (en) Valve train having variable valve spring
JP2000282876A (en) Exhaust control valve device for two-cycle engine
JP2010127346A (en) Hydraulic tensioner
JP3694073B2 (en) Variable valve controller
JPS58220910A (en) Tappet valve apparatus of internal-combustion engine
JPH0245603A (en) Variable valve timing device for intake/exhaust system of engine
JPH05113130A (en) Torque fluctuation reduction device for internal combustion engine
JPH0742511A (en) Valve system for engine
JPH0350264Y2 (en)