JPH0526946B2 - - Google Patents
Info
- Publication number
- JPH0526946B2 JPH0526946B2 JP60072572A JP7257285A JPH0526946B2 JP H0526946 B2 JPH0526946 B2 JP H0526946B2 JP 60072572 A JP60072572 A JP 60072572A JP 7257285 A JP7257285 A JP 7257285A JP H0526946 B2 JPH0526946 B2 JP H0526946B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- temperature
- yoke
- engine
- choke
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
- F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は内燃機関特に汎用小形内燃機関用オー
トチヨーク装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic yoke device for internal combustion engines, particularly for general-purpose small internal combustion engines.
従来の汎用小形内燃機関用オートチヨーク装置
の１例を第４図に示す。図において１は絞り弁、
２はベンチユリ、３は主燃料噴出のためのメーン
ノズル、４はチヨークボア、５はチヨークバル
ブ、６はチヨークロツド、７はバイメタル、８は
チヨークケース、９は加熱ヒータ、１０は加熱ヒ
ータ９への通電量制御装置である。
An example of a conventional autochoke device for a general-purpose small internal combustion engine is shown in FIG. In the figure, 1 is a throttle valve;
2 is a bench lily, 3 is a main nozzle for ejecting the main fuel, 4 is a choke bore, 5 is a choke valve, 6 is a choke rod, 7 is a bimetal, 8 is a choke case, 9 is a heater, and 10 is the amount of electricity to the heater 9. It is a control device.
気化器付き内燃機関では、通常運転中チヨーク
バルブ５は開かれて第４図５′の位置にあり、ピ
ストン（図示せず）の下降による負圧により吸引
される空気は、エアクリーナ（図示せず）、チヨ
ークボア４を通過したのちベンチユリ２で絞られ
ると同時に、メーンノズル３に負圧を発生させて
燃料を吸い上げ、メーンノズル３の先端より燃料
を噴出させる。噴出した燃料と空気は混合気とな
り、スロツトルバルブ１により流量を制御され、
シリンダ（図示せず）に送り込まれて燃焼する。 In an internal combustion engine with a carburetor, during normal operation, the choke valve 5 is open and in the position shown in FIG. After passing through the choke bore 4, the fuel is throttled by the bench lily 2, and at the same time, negative pressure is generated in the main nozzle 3 to suck up the fuel, and the fuel is ejected from the tip of the main nozzle 3. The jetted fuel and air become a mixture, and the flow rate is controlled by the throttle valve 1.
It is fed into a cylinder (not shown) and burned.
一方、機関の低温時には、メーンノズル３より
供給される燃料が充分気化（蒸発）しないため、
シリンダに送り込まれる混合気は空気過剰で、混
合気の可燃限界にないことが多くあり、吸入空気
量を制御してこれを避けるためチヨークバルブ５
を設置している。したがつて、チヨークバルブ５
の開度は温度によつて変化させる必要があり、従
来は、チヨークバルブ５にチヨークロツド６を連
結し、温度感知器であるバイメタル７の温度によ
る変位をチヨークバルブ５に伝える構造となつて
いる。ヒータ９はバイメータ７の温度変位を大き
くするためのものであり、また通電量制御装置１
０はヒータ９によるバイメタル７の過熱を防止す
るためのものである。 On the other hand, when the engine is at low temperature, the fuel supplied from the main nozzle 3 is not sufficiently vaporized (evaporated).
The air-fuel mixture fed into the cylinder often has excess air and is not within the flammable limit of the air-fuel mixture.In order to avoid this by controlling the amount of intake air,
is installed. Therefore, the chiyoke valve 5
It is necessary to change the degree of opening of the valve according to the temperature. Conventionally, the valve 5 is connected to a valve rod 6 to transmit the temperature-induced displacement of a bimetal 7, which is a temperature sensor, to the valve 5. The heater 9 is for increasing the temperature variation of the bimeter 7, and also serves as the energization amount control device 1.
0 is for preventing the bimetal 7 from being overheated by the heater 9.
しかしながら、かかる従来のオートチヨーク装
置では、バイメタル７の温度による変位が小さい
ため、該バイメタル７を過熱するための過熱ヒー
タ９等の装置を必要とするのと同時に、バイメタ
ル７の過熱を制御する装置も必要となる。このた
めオートチヨーク装置が大型化するとともに高価
格化が避けられないという問題点がある。
However, in such a conventional autochoke device, since the displacement of the bimetal 7 due to temperature is small, a device such as a superheater 9 is required to overheat the bimetal 7, and at the same time, a device for controlling overheating of the bimetal 7 is also required. It becomes necessary. For this reason, there are problems in that the autochoke device becomes larger and inevitably becomes more expensive.
本発明は上記に鑑みなされたもので、構造が簡
単化され製造コストの低廉なオートチヨーク装置
を提供することを目的とする。 The present invention has been made in view of the above, and it is an object of the present invention to provide an automatic yoke device that has a simplified structure and is inexpensive to manufacture.
本発明に係る内燃機関のオートチヨーク装置
は、吸気管内差圧により、可撓自在に機関に取り
付けられ機関温度の変化により吸気管絞りを調整
できる高分子ウレタンエラストマー材からなるチ
ヨークバルブを具え前記目的を達成できるように
したのが特徴である。
The auto-choke device for an internal combustion engine according to the present invention achieves the above-mentioned object by having a chock valve made of a polymeric urethane elastomer material that is flexibly attached to the engine and can adjust intake pipe throttling according to changes in engine temperature based on the differential pressure inside the intake pipe. The feature is that it has been made possible.
以下第１〜３図を参照して本発明の一実施例に
ついて説明する。
An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第１図は要部概略図、第２図は第１図の矢視
図である。図において、１１は高分子ウレタンエ
ラストマーを用いたチヨークバルブで、その受圧
面積はＡ（cm2）である。１２はチヨークバルブ１
１を気化器ボデーに固着するねじ、１３はメーン
ノズル、１４はスロツトルバルブである。 FIG. 1 is a schematic view of the main parts, and FIG. 2 is a view taken in the direction of the arrows in FIG. 1. In the figure, reference numeral 11 is a chiyoke valve made of high-molecular urethane elastomer, and its pressure-receiving area is A (cm 2 ). 12 is the chiyoke valve 1
1 is a screw fixed to the carburetor body, 13 is a main nozzle, and 14 is a throttle valve.
次に前記実施例の作用について説明する。 Next, the operation of the above embodiment will be explained.
上記構成のオートチヨーク装置において、チヨ
ークバルブ１１には機関運転時吸入管負圧pb
（Kg／cm2）の時Ｐ＝pbＡ（Kg）の全荷重を受ける。
この際負圧pbによるチヨークバルブのたわみδTは
片持ばりに分布荷重が働く場合に相等しく、
但しｌはチヨークバルブの長さ、Ｅは高分子エ
ラストマーよりなるチヨークバルブの縦弾性係
数、Ｉはチヨークバルブの２個の取付ピス中心線
を含みチヨークバルブに垂直な断面に関する断面
２次モーメントである。 In the auto-choke device with the above configuration, the chi-yoke valve 11 has suction pipe negative pressure p b during engine operation.
When (Kg/cm 2 ), P=p b A (Kg) of total load is received.
At this time, the deflection δ T of the chiyoke valve due to the negative pressure p b is equal when a distributed load is applied to the cantilever beam. Here, 1 is the length of the yoke valve, E is the longitudinal elastic modulus of the yoke valve made of polymer elastomer, and I is the moment of inertia of the area with respect to a cross section perpendicular to the yoke valve including the center line of the two mounting pins of the yoke valve.
第３図は本発明に係るチヨークバルブ１１用材
料の温度と縦弾性係数Ｅとの特性を示す線図であ
る。一般に高分子物質には縦弾性係数Ｅが温度に
より急激に変化するガラス転移点Tgが存在する
ことが知られているが、例えばイリフオロンジイ
ソシアネートとビスフエノールを重合したウレタ
ンエラストマーにおいては、ガラス転移点Tgを
常温付近（10℃〜20℃）に設定することができ
る。 FIG. 3 is a diagram showing the characteristics of the temperature and longitudinal elastic modulus E of the material for the yoke valve 11 according to the present invention. It is generally known that polymeric substances have a glass transition point Tg at which the longitudinal elastic modulus E changes rapidly depending on temperature. Tg can be set around room temperature (10°C to 20°C).
つまり、式(1)において、温度によりチヨークバ
ルブ１１の縦弾性係数Ｅが変化するため、たわみ
量δTがTgを境にして変化する。従つて機関温態
時チヨークを必要としない温度では、チヨークバ
ルブ１１はTg以上の温度となつているため、た
わみ量δTは大きく、チヨークは開かれた状態とな
り、逆に機関冷態時でチヨーク作用を必要とする
温度では、チヨークバルブ１１のたわみδTが小さ
いため、チヨークは閉じた状態となる。さらに機
関運転終了後に吸入負圧pbがないため、チヨーク
バルブ１１はそれ自身の剛性により機関運転前の
位置に戻る。次にそのままの状態で機関温度が下
がつてTgになれば、機関再始動時チヨークバル
ブ１１は閉の位置に保持されるが、機関温度が十
分低下せず即ちTg以上の温度で機関を再始動し
た場合には、Ｅが小さいのでチヨークバルブ１１
は吸入負圧pbによりチヨーク開の位置までたわ
み、オーバチヨーク等の不具合を起すことはな
い。 That is, in equation (1), since the longitudinal elastic modulus E of the choke valve 11 changes depending on the temperature, the deflection amount δ T changes with Tg as the boundary. Therefore, when the engine is hot and the temperature does not require the cheese yoke, the cheese yoke valve 11 is at a temperature higher than Tg, so the amount of deflection δ T is large and the cheese yoke is in an open state. At the temperature where the action is required, the deflection δT of the yoke valve 11 is small, so the yoke is in a closed state. Further, since there is no suction negative pressure pb after the engine operation ends, the choke valve 11 returns to the position before the engine operation due to its own rigidity. Next, if the engine temperature continues to drop to Tg, the choke valve 11 will be held in the closed position when the engine is restarted, but the engine temperature will not drop sufficiently, that is, the engine will be restarted at a temperature above Tg. In this case, since E is small, the chiyoke valve 11
is deflected to the yoke open position due to suction negative pressure pb , and problems such as over-yoke do not occur.
前述のとおり本発明のオートチヨーク装置は、
吸気管差圧により可撓自在に機関に取り付けられ
機関の温度の変化により、上記吸気管絞りを調整
する高分子ウレタンエラストマー材からなるチヨ
ークバルブをとりつけたので、チヨークバルブの
みでチヨークバルブの自動開閉をすることがで
き、バイメタルを用いた従来のオートチヨーク装
置のように加熱用ヒータ、バイメタルの過熱防止
装置等の付属装置を必要とせず、装置が簡略化さ
れると共に製造コストが低減される利点がある。
As mentioned above, the automatic yoke device of the present invention has the following features:
A chiyoke valve made of a polymer urethane elastomer material is attached to the engine flexibly based on the differential pressure in the intake pipe and adjusts the intake pipe restriction according to changes in engine temperature.The chiyoke valve can be automatically opened and closed using only the chiyoke valve. Unlike the conventional automatic yoke device using bimetal, it does not require accessory devices such as a heater and a bimetal overheat prevention device, which has the advantage of simplifying the device and reducing manufacturing costs.
また本発明は、イリフオロンジイソシアネート
とビスフエノールを重合したウレタンエラストマ
ー材の高分子ウレタンエラストマー材より成るチ
ヨークバルブをそなえている。この高分子ウレタ
ンエラストマー材は、縦弾性係数Ｅが変化する温
度であるガラス転移点Tgが材料物性そのもので
あることから、このガラス転移点Tgを自由に設
定できるとともに、また該ガラス転移点（前記Ｅ
が変化する温度）が温度、湿度に影響されず安定
して得られる。従つて、高分子ウレタンエラスト
マー材から成るチヨークバルブを備えた本発明の
オートチヨーク装置は、機関側から要求されるチ
ヨーク温度（チヨークバルブ閉温度）を自由に設
定できるとともに、作動の安定性が高い。 The present invention also provides a chiyoke valve made of a polymeric urethane elastomer material obtained by polymerizing irifluorone diisocyanate and bisphenol. In this polymeric urethane elastomer material, the glass transition point Tg, which is the temperature at which the longitudinal elastic modulus E changes, is a physical property of the material itself. E
can be obtained stably without being affected by temperature or humidity. Therefore, the auto-choke device of the present invention equipped with a chi-yoke valve made of a polymeric urethane elastomer material can freely set the chi-yoke temperature (chyo-yoke valve closing temperature) required by the engine, and has high operational stability.
第１図は本発明に係る実施例の要部概要図、第
２図は第１図の矢視図、第３図は本発明に係る
チヨークバルブに使用する高分子ウレタンエラス
トマーの特性曲線、第４図は従来例の概要図であ
る。
１１……チヨークバルブ、１２……チヨークバ
ルブ取付ねじ、１３……メーンノズル、１４……
スロツトルバルブ。
FIG. 1 is a schematic view of the main parts of an embodiment according to the present invention, FIG. 2 is a view taken in the direction of the arrow in FIG. The figure is a schematic diagram of a conventional example. 11...Chiyoke valve, 12...Cheyoke valve mounting screw, 13...Main nozzle, 14...
Throttle valve.
Claims (1)
閉するオートチヨーク装置を具えた内燃機関にお
いて、高分子ウレタンエラストマー材からなり、
吸気管内差圧により可撓自在に機関に取付けられ
て機関温度の変化により上記吸気管の絞りを調整
するチヨークバルブを具えたことを特徴とする内
燃機関のオートチヨーク装置。1. In an internal combustion engine equipped with an auto-choke device that automatically opens and closes a chi-yoke valve depending on the engine temperature,
An auto-choke device for an internal combustion engine, comprising a chi-yoke valve that is flexibly attached to the engine based on a differential pressure in the intake pipe and adjusts the throttle of the intake pipe according to changes in engine temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7257285A JPS61241450A (en) | 1985-04-08 | 1985-04-08 | Automatic choke device for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7257285A JPS61241450A (en) | 1985-04-08 | 1985-04-08 | Automatic choke device for internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61241450A JPS61241450A (en) | 1986-10-27 |
| JPH0526946B2 true JPH0526946B2 (en) | 1993-04-19 |
Family
ID=13493220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7257285A Granted JPS61241450A (en) | 1985-04-08 | 1985-04-08 | Automatic choke device for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61241450A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1321933C (en) * | 1988-06-29 | 1993-09-07 | Kazuyuki Kobayashi | Control apparatus for an engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5755945U (en) * | 1980-09-17 | 1982-04-01 |
-
1985
- 1985-04-08 JP JP7257285A patent/JPS61241450A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61241450A (en) | 1986-10-27 |
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