JPS622281Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は内燃エンジンの始動燃料供給装置にお
ける制御弁の作動制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the operation of a control valve in a starting fuel supply system for an internal combustion engine.

従来この種装置として、エンジンの吸気通路に
気化器の絞り弁の上流側と下流側とを連通するバ
イパス通路を設けると共に、これに始動用燃料供
給装置と、開閉制御用の制御弁とを備え、該弁を
該エンジンの完爆時の吸気負圧によれば閉じ側に
作動されるようにした式のものは知られており、
更にこのものにおいて該弁の閉じ速度を温度に応
じて制御すべく液体の粘性変化を利用するように
した式のものも知られるが、この場合その制御は
該液体により直接行わせる式を一般とするもので
かゝるものでは該液体を温度検出用のエンジン本
体に近い部分と制御用の気化器に近い部分とに用
意して両部分を液密のパイプで連通するを要し、
その管理が面倒であると共に液洩れによれば制御
特性が変化する等の不都合を伴う。 Conventionally, this type of device includes a bypass passage that communicates the upstream side and the downstream side of the throttle valve of the carburetor in the intake passage of the engine, and also includes a starting fuel supply device and a control valve for opening/closing control. , a type in which the valve is operated to the closing side according to the intake negative pressure at the time of complete explosion of the engine is known,
Furthermore, there is also known a type that uses changes in the viscosity of the liquid to control the closing speed of the valve according to the temperature, but in this case, a type in which the control is performed directly by the liquid is generally used. In such a device, it is necessary to prepare the liquid in a part near the engine body for temperature detection and a part near the carburetor for control, and to communicate the two parts with a liquid-tight pipe.
It is troublesome to manage it, and there are also disadvantages such as changes in control characteristics due to liquid leakage.

本考案はかゝる不都合のない装置を得ることを
その目的としたもので、エンジンの吸気通路１
に、気化器２の絞り弁の上流側と下流側とを連通
するバイパス通路３を設けると共に、該通路３に
始動用燃料供給装置４と該通路３を開閉制御する
制御弁５とを備えるものにおいて、該制御弁５に
該エンジンの完爆時は該エンジンの吸気負圧を作
用されて該弁５を閉じ側に作動する負圧応動部材
６と、該部材６の該閉じ側の作動によれば内容積
を増大される第１空気室７とを設けると共に、該
第１空気室７に連通する第２空気室８を該第１空
気室７と分離した位置に設け、更に該第２空気室
８と可動部材９を介して液密に区別される第１液
体室１０と、該第１液体室１０に絞り１１を介し
て連通されると共に該エンジン温度又は外気温度
を作用されて内部の液体の粘性が加減される第２
液体室１２とを該第２空気室８と一体的に設けて
成る。 The purpose of the present invention is to obtain a device that does not have such inconveniences.
A bypass passage 3 is provided to communicate the upstream side and the downstream side of the throttle valve of the carburetor 2, and the passage 3 is equipped with a starting fuel supply device 4 and a control valve 5 for controlling the opening and closing of the passage 3. , a negative pressure responsive member 6 which operates the control valve 5 to close the valve 5 by applying negative air intake pressure of the engine when the engine is fully detonated; According to this method, a first air chamber 7 whose internal volume is increased is provided, a second air chamber 8 communicating with the first air chamber 7 is provided at a position separated from the first air chamber 7, and furthermore, a second air chamber 8 communicating with the first air chamber 7 is provided at a position separated from the first air chamber 7. A first liquid chamber 10 is separated liquid-tightly through an air chamber 8 and a movable member 9, and the inside is communicated with the first liquid chamber 10 through a throttle 11 and is controlled by the engine temperature or outside air temperature. The second step, in which the viscosity of the liquid is adjusted
A liquid chamber 12 is provided integrally with the second air chamber 8.

第１図乃至第３図はその１例を示すもので、始
動用燃料供給装置４は気化器２のフロートチヤン
バ２ａからのびる燃料通路から成り、これにジエ
ツト４ａが介入される型式とし、負圧応動部材６
は第１空気室７の前面のダイヤフラムから成り、
その前面の室６ａ内は整流回路６ｂを有する負圧
通路６ｃを介して吸気通路１内に連ると共にその
前面に制御弁５を開き側に作用するばね６ｄを備
える型式とした。尚該ばね６ｄは例えば第４図示
のように長さの異る２個のばねから成る２段ばね
式とすることも可能である。更に第２空気室８は
エアパイプ１３を介して第１空気室７に連通され
て第１第２液体室１０，１２と共にエンジン本体
１４の近傍に用意されるものとし、両液体室１
０，１２は中間の隔壁１５で互に区別されると共
に該隔壁１５に絞り１１を備える型式とし、更に
第２空気室８と第２液体室１２との各内部には制
御弁５を開く例の各ばね８ａ，１２ａが備えられ
るようにした。尚第２液体室１２はエンジン温度
に応動するバイメタル１６をその背面に備えてこ
れに押される型式とすることも可能である。 FIGS. 1 to 3 show one example of this, and the starting fuel supply system 4 consists of a fuel passage extending from the float chamber 2a of the carburetor 2, in which a jet 4a is inserted. Pressure-responsive member 6
consists of a diaphragm in front of the first air chamber 7,
The inside of the chamber 6a on the front side is connected to the intake passage 1 through a negative pressure passage 6c having a rectifying circuit 6b, and a spring 6d is provided on the front side of the chamber 6a to act on the opening side of the control valve 5. The spring 6d can also be of a two-stage spring type consisting of two springs of different lengths, for example as shown in the fourth figure. Furthermore, the second air chamber 8 is communicated with the first air chamber 7 via an air pipe 13 and is provided near the engine body 14 together with the first and second liquid chambers 10 and 12.
0 and 12 are separated from each other by an intermediate partition wall 15, and the partition wall 15 is provided with a throttle 11, and a control valve 5 is opened in each of the second air chamber 8 and the second liquid chamber 12. Each spring 8a, 12a is provided. The second liquid chamber 12 may also be of a type that has a bimetal 16 on its back surface that responds to the engine temperature and is pushed by this.

第５図及び第６図はその一部の変形例を示すも
ので、負圧応動部材６の前面の室６ａに、内圧取
出用の手動式の開閉弁１７を備えるようにし、更
に該部材６を構成するダイヤフラムの背側に該ダ
イヤフラムのストロークを調整するねじ式の目盛
手段１８を備えるようにした。 FIGS. 5 and 6 show a partial modification example, in which a chamber 6a on the front side of the negative pressure responsive member 6 is provided with a manual on-off valve 17 for taking out the internal pressure, and the member 6 A screw type scale means 18 for adjusting the stroke of the diaphragm is provided on the back side of the diaphragm constituting the diaphragm.

その作動を説明するに、エンジンの完爆に際し
ては、その吸気負圧が負圧応動部材６の前面に作
用して制御弁５に閉じ側の作動を生じ、この際そ
の閉じ速度は第２液体室１２内の液体が絞り１１
を介して第１液体室１０に流入する速度に依存
し、これは該液体の粘性に対応し更に該粘性はこ
れに作用する温度に依存するもので、かくて閉じ
速度はエンジン温度或は外気温度に応じて制御さ
れることとなる。この点は従来のものと特に異ら
ないが、本考案によれば中間に互に連通されると
共に互に分離する位置の第１第２空気室７，８が
介入されるもので、かくて温度検出部と制御部と
は空気室７，８間の連通による互に分離した配置
となるものでかくて前記した液密のパイプにより
連通する式のものにおける前記した不都合がな
い。これを換言すれば、漏れ部分によごれの発生
がなく、更に調整に際しては単にエアを導入すれ
ば足りるものである。 To explain its operation, when the engine completely explodes, the intake negative pressure acts on the front surface of the negative pressure responsive member 6, causing the control valve 5 to close, and at this time, the closing speed is lower than that of the second fluid. The liquid in the chamber 12 is squeezed 11
, which corresponds to the viscosity of the liquid, which in turn depends on the temperature acting on it, and thus the closing speed depends on the engine temperature or the outside air. It will be controlled according to the temperature. This point is not particularly different from the conventional one, but according to the present invention, the first and second air chambers 7 and 8 are interposed in the middle, which communicate with each other and are separated from each other. The temperature detection section and the control section are arranged separately from each other through communication between the air chambers 7 and 8, and thus do not have the above-mentioned disadvantages of the above-mentioned type that communicates with each other through a liquid-tight pipe. In other words, there is no occurrence of contamination in the leakage portion, and furthermore, it is sufficient to simply introduce air for adjustment.

このように本考案によるときは制御部を構成す
る第１空気室７と温度検出部を構成する第２液体
室１２とを互に分離させると共に両部の連通を空
気による連通とするもので、両部を液体による連
通とする式のものにおける前記した不都合がな
く、調整を容易にする効果を有する。 In this way, according to the present invention, the first air chamber 7 constituting the control section and the second liquid chamber 12 constituting the temperature detection section are separated from each other, and the communication between the two parts is made by air. This eliminates the above-mentioned disadvantages of the type in which both parts are communicated by liquid, and has the effect of facilitating adjustment.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本案装置の１例の一部を截除した側面
図、第２図はその正面図、第３図は全体の系統線
図、第４図はその一部の変形例の側面図、第５図
は他の変形例の一部の截断側面図、第６図はその
正面図である。 １……吸気通路、２……気化器、３……バイパ
ス通路、４……始動用燃料供給装置、５……制御
弁、６……負圧応動部材、７……第１空気室、８
……第２空気室、９……可動部材、１０……第１
液体室、１１……絞り、１２……第２液体室。 Fig. 1 is a partially cutaway side view of an example of the proposed device, Fig. 2 is a front view thereof, Fig. 3 is an overall system diagram, and Fig. 4 is a side view of a partial modification thereof. , FIG. 5 is a partially cutaway side view of another modification, and FIG. 6 is a front view thereof. DESCRIPTION OF SYMBOLS 1...Intake passage, 2...Carburizer, 3...Bypass passage, 4...Starting fuel supply device, 5...Control valve, 6...Negative pressure responsive member, 7...First air chamber, 8
...Second air chamber, 9...Movable member, 10...First
Liquid chamber, 11...Aperture, 12...Second liquid chamber.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] エンジンの吸気通路１に、気化器２の絞り弁の
上流側と下流側とを連通するバイパス通路３を設
けると共に、該通路３に始動用燃料供給装置４と
該通路３を開閉制御する制御弁５とを備えるもの
において、該制御弁５に該エンジンの完爆時は該
エンジンの吸気負圧を作用されて該弁５を閉じ側
に作動する負圧応動部材６と、該部材６の該閉じ
側の作動によれば内容積を増大される第１空気室
７とを設けると共に、該第１空気室７に連通する
第２空気室８を該第１空気室７と分離した位置に
設け、更に該第２空気室８と可動部材９を介して
液密に区別される第１液体室１０と、該第１液体
室１０に絞り１１を介して連通されると共に該エ
ンジン温度又は外気温度を作用されて内部の液体
の粘性が加減される第２液体室１２とを該第２空
気室８と一体的に設けて成る始動用燃料供給装置
における制御弁の作動制御装置。 The intake passage 1 of the engine is provided with a bypass passage 3 that communicates between the upstream side and the downstream side of the throttle valve of the carburetor 2, and the passage 3 is provided with a starting fuel supply device 4 and a control valve that controls the opening and closing of the passage 3. 5, a negative pressure responsive member 6 which operates the control valve 5 to close the valve 5 by applying negative air intake pressure of the engine when the engine is fully detonated; A first air chamber 7 whose internal volume is increased when the closing side is operated is provided, and a second air chamber 8 communicating with the first air chamber 7 is provided at a position separated from the first air chamber 7. , furthermore, a first liquid chamber 10 which is liquid-tightly separated from the second air chamber 8 via a movable member 9, and which is communicated with the first liquid chamber 10 via a throttle 11, and which is connected to the engine temperature or outside air temperature. An operation control device for a control valve in a starting fuel supply device, which is provided integrally with the second air chamber 8, and a second liquid chamber 12 in which the viscosity of the liquid inside is controlled by the action of the second air chamber 8.