JPH0424541B2 - - Google Patents
Info
- Publication number
- JPH0424541B2 JPH0424541B2 JP57200311A JP20031182A JPH0424541B2 JP H0424541 B2 JPH0424541 B2 JP H0424541B2 JP 57200311 A JP57200311 A JP 57200311A JP 20031182 A JP20031182 A JP 20031182A JP H0424541 B2 JPH0424541 B2 JP H0424541B2
- Authority
- JP
- Japan
- Prior art keywords
- operating shaft
- housing
- bimetal
- disk
- valve
- 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
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 description 12
- 239000000446 fuel Substances 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- F02M1/12—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 with means for electrically heating thermostat
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は車両用エンジンの気化器などに適用す
る偏角補正形自動チヨーク装置に係わり、特にチ
ヨーク弁自動操作用の電熱式ヒータと偏角補正用
の構成部との関連構造を改良して高地規制用の高
エミツシヨン特性を付与する構成の具体的実現を
図つた偏角補正形自動チヨーク装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic tilt correction device for use in a carburetor of a vehicle engine, and more particularly to an electric heater for automatic tilt valve operation and a tilt correction device. The present invention relates to a declination correction type automatic tilt yoke device that specifically realizes a configuration that provides high emission characteristics for high altitude regulation by improving the structure related to the components for use in high altitude areas.
従来のスタータ始動方式の気化器は、例えば実
公昭46−20089号公報に示されているが、これは
エンジンの吸入角圧のみで制御される独立始動装
置が使用されている。
A conventional starter-starting type carburetor is disclosed in, for example, Japanese Utility Model Publication No. 1989-20089, which uses an independent starting device that is controlled only by the intake angle pressure of the engine.
従来、車両用エンジンの始動系の仕様は、低温
時の始動特性を主要素として設定されているのが
一般的である。このため、エンジンの暖気中の混
合気は一般にオーバリツチ気味となり、CO，
NOxに基づくエミツシヨン、或いは燃費を悪く
する原因となつている。 Conventionally, the specifications of a starting system for a vehicle engine have generally been set with starting characteristics at low temperatures as the main factor. For this reason, when the engine is warming up, the air-fuel mixture generally tends to be overbalanced, causing CO,
Emissions based on NOx are the cause of poor fuel efficiency.
又、最近では環境衛生の見地から排出ガス規制
の強化が望まれており、特に空気中の酸素濃度が
低い高地においては、更に高度の排出ガス規制、
いわゆる高地規制が実施されつつある。 In addition, recently there has been a desire for stricter exhaust gas regulations from the perspective of environmental health, and even higher exhaust gas regulations are required, especially in highlands where the oxygen concentration in the air is low.
So-called high-altitude regulations are being implemented.
このような事情から、従来、エンジン始動時の
冷却水温の上昇などに付随させてチヨーク弁を自
動的に開動するとともに、エンジン始動後、冷却
水温及び走行車速が一定値以上に達した場合に、
チヨーク弁を強制的に急速開動する偏角補正機構
装置を設けた偏角補正形自動チヨーク装置が開発
された。 For this reason, conventionally, the check valve is automatically opened in conjunction with an increase in the cooling water temperature when starting the engine, and when the cooling water temperature and vehicle speed reach a certain value or higher after the engine is started,
An automatic tilt correction device has been developed that is equipped with a tilt correction mechanism that forcibly opens the tilt valve rapidly.
ところが、従来の装置では厳しい排出ガス規制
に適合するチヨーク弁開度を得ることが構成的に
困難であり、特に高地規制におけるエミツシヨン
対策として充分なものを提供することは困難であ
つた。 However, with conventional devices, it is structurally difficult to obtain a choke valve opening that meets strict exhaust gas regulations, and it has been particularly difficult to provide a sufficient emission countermeasure under high altitude regulations.
即ち、従来の装置及びその特性を第１図乃至第
３図によつて説明すると、気化器１に円筒形ハウ
ジング２を付設している。このハウジング２の一
端壁２Ａに操作軸３を軸受４を介して回動可能に
挿通している。そして、この操作軸３のハウジン
グ２への挿入端側にコイル状バイメタル５の中心
部を支持させている。このバイメタル５の変形
部、即ち外周側にチヨーク弁６開動用レバー７を
連結している。尚、８はレバー７とチヨーク弁６
とを連結するチヨーク弁軸である。ハウジング２
内には、バイメタル加熱用の電熱式ヒータ９を収
納している。このヒータ９については後に詳述す
る。一方、操作軸３のハウジング２からの突出端
側には一定暖気域でチヨーク弁６への急速開動指
令を与えるための偏角補正用チヨークピストン１
０をコネクチングロツド１１及びレバー１２を介
して連結している。チヨークピストン１０は図示
しないが内部に設けたダイヤフラムによつてコネ
クチングロツド１１を押引きするもので、その作
動は気化器１の内圧（負圧）に基づくものであ
る。即ち、チヨークピストン１０は接続管１３を
介して絞り弁１４の下流に負圧取出口１５を開孔
させており、この接続管１３の途中に設けたソレ
ノイドバルブ１６を水温スイツチ１７及び車速ス
イツチ１８により制御動作するようにして、エン
ジンの一定暖気域到達時に負圧をチヨークピスト
ン１０に導入し、レバー１２を介して操作軸３を
回動させ、バイメタル５全体の回動によりチヨー
ク弁６を急速に開放させる補正動作を行うように
している。尚、一定の暖気域に達するまでは、操
作軸３は固定状態であり、従つてエンジン始動直
後はヒータ９によるバイメタル５の熱変形のみに
より、チヨーク弁６は徐々に開くものである。こ
こでヒータ９について説明すると、ヒータ９はバ
イメタル５に輻射熱を与えるようにしたもので、
ハウジング１に固定した熱板兼用のアース板１９
を介してバイメタル５から離間した配置で収納さ
れ、ハウジングに設けたリード線２０及び接触子
２１に接続してある。尚、ハウジング１は軸方向
に二分割型とされ、例えば金属製のサーモハウジ
ング１Ａと樹脂製のサーモカバー１Ｂとをアース
板１９を挾着状態で締付具２２によつて一体的に
固定したものである。尚、操作軸３の軸方向位置
を安定させるため例えば圧縮コイルスプリング２
３によつてこの操作軸３を突出側に所定圧力で押
圧している。 That is, to explain the conventional device and its characteristics with reference to FIGS. 1 to 3, a cylindrical housing 2 is attached to a carburetor 1. An operating shaft 3 is rotatably inserted into one end wall 2A of the housing 2 via a bearing 4. The center portion of the coiled bimetal 5 is supported on the insertion end side of the operating shaft 3 into the housing 2. A lever 7 for opening the chiyoke valve 6 is connected to the deformed portion of the bimetal 5, that is, to the outer circumferential side. In addition, 8 is the lever 7 and the check valve 6.
This is the chiyoke valve shaft that connects the housing 2
An electric heater 9 for heating bimetal is housed inside. This heater 9 will be explained in detail later. On the other hand, on the protruding end side of the operating shaft 3 from the housing 2, there is provided a yoke piston 1 for declination correction for giving a quick opening command to the yoke valve 6 in a certain warm air region.
0 are connected via a connecting rod 11 and a lever 12. Although not shown, the choke piston 10 pushes and pulls the connecting rod 11 by means of a diaphragm provided therein, and its operation is based on the internal pressure (negative pressure) of the carburetor 1. That is, the choke piston 10 has a negative pressure outlet 15 opened downstream of the throttle valve 14 via a connecting pipe 13, and a solenoid valve 16 provided in the middle of the connecting pipe 13 is connected to the water temperature switch 17 and the vehicle speed switch. When the engine reaches a certain warm-up range, negative pressure is introduced into the chiyoke piston 10, and the operating shaft 3 is rotated via the lever 12, and the bimetal 5 as a whole rotates to open the chiyoke valve 6. A correction operation is performed to rapidly open the valve. It should be noted that the operating shaft 3 is in a fixed state until the temperature reaches a certain warm temperature range, and therefore, immediately after the engine starts, the check valve 6 gradually opens only due to thermal deformation of the bimetal 5 by the heater 9. To explain the heater 9 here, the heater 9 is designed to give radiant heat to the bimetal 5.
Earth plate 19 that also serves as a heating plate fixed to the housing 1
It is housed in a spaced apart position from the bimetal 5 via the housing, and is connected to a lead wire 20 and a contact 21 provided on the housing. The housing 1 is split into two parts in the axial direction, and for example, a metal thermo-housing 1A and a resin thermo-cover 1B are integrally fixed with a fastener 22 with a ground plate 19 clamped therebetween. It is something. In order to stabilize the axial position of the operating shaft 3, for example, a compression coil spring 2 is used.
3 presses the operating shaft 3 toward the protruding side with a predetermined pressure.
次に特性を第３図によつて説明する。 Next, the characteristics will be explained with reference to FIG.
縦軸にチヨーク弁開度、横軸にエンジン冷却水
温及び時間を示す。前記従来の構造、即ちバイメ
タル５とヒータ９及び熱板１９とを離隔配置した
場合は、ヒータ９の熱がバイメタル５に対して輻
射によつて伝達されるため、エンジン始動後のバ
イメタルの延びは比較的緩やかである。従つて、
この場合は第３図に特性線ａで示すようにエンジ
ン冷却水温の上昇に対してチヨーク弁開度は緩や
かにしか立ち上らない。即ち、エンジンの暖気域
（アイドル運転）においては比較的高濃度の燃料
が供給され続ける状態となる。従つて、エンジン
冷却水温がＢ点（50〜60℃）に達した場合でも高
濃度燃料が供給されるため、エミツシヨン特性が
好ましくなく、特に高地規制に対しては不適合と
なりやすい。 The vertical axis shows the opening of the check valve, and the horizontal axis shows the engine cooling water temperature and time. In the conventional structure, that is, when the bimetal 5, the heater 9, and the hot plate 19 are placed apart from each other, the heat of the heater 9 is transmitted to the bimetal 5 by radiation, so the extension of the bimetal after the engine starts is It is relatively gradual. Therefore,
In this case, as shown by the characteristic line a in FIG. 3, the opening of the choke valve increases only gradually with respect to the rise in engine cooling water temperature. That is, in the engine warm-up region (idle operation), a relatively high concentration of fuel continues to be supplied. Therefore, even when the engine cooling water temperature reaches point B (50 to 60° C.), high concentration fuel is supplied, resulting in unfavorable emission characteristics and, in particular, a tendency to become non-compliant with high altitude regulations.
そこで、偏角補正用チヨークピストン１０に基
づく偏角補正手段により、操作軸３をＢ点に到達
した時に強制的に回動操作し、第３図の特性線ｃ
に移動させるようにする。そうすると、チヨーク
弁開度が急速に全開状態に近づくため、エミツシ
ヨン特性がヒータ９に基づく加熱作用のみの場合
に比較して向上できるものである。 Therefore, when the operating shaft 3 reaches point B, the operating shaft 3 is forcibly rotated by the declination correction means based on the yoke piston 10 for declination correction, and the characteristic line c in FIG.
so that it is moved to In this case, the opening degree of the choke valve rapidly approaches the fully open state, so that the emission characteristics can be improved compared to the case where only the heating action based on the heater 9 is used.
ところが、発明者らの検討結果によると、特性
線ａ→ｃに移行するようにしても、高地規制には
エミツシヨン特性上完全には適合しえないことが
見出された。即ち、完爆開度θ1（25゜）にチヨーク
弁開度が達する時間（２〜３秒）（第３図のＡ点）
から、Ｂ点（50〜60℃）に到るチヨーク弁開度θ2
（30゜）までの途中における燃料濃度がまだ高す
ぎ、エミツシヨン特性が不満足であることが判明
した。そこで、ヒータ９の材質改良を試み、例え
ばPTCヒータを熱源とすることにより加熱特性
の向上を図つたところ、第３図の特性線ｂの如く
チヨーク開度の立上り特性をある程度向上できる
ことが明らかとなつたが、この場合もまだ高地規
制車などに対しては不満足であつた。 However, according to the results of studies conducted by the inventors, it has been found that even if the characteristic line is shifted from characteristic line a to c, it cannot completely comply with the high-altitude regulations due to emission characteristics. In other words, the time (2 to 3 seconds) for the throttle valve opening to reach the complete explosion opening θ 1 (25°) (point A in Figure 3)
, the opening degree of the chiyoke valve θ 2 to reach point B (50 to 60°C)
It was found that the fuel concentration on the way up to (30°) was still too high and the emission characteristics were unsatisfactory. Therefore, when we tried to improve the material of the heater 9, for example by using a PTC heater as the heat source, we found that it was possible to improve the rise characteristics of the cheese yoke opening to some extent, as shown by the characteristic line b in Fig. 3. However, in this case, I was still dissatisfied with the high altitude regulation vehicles.
一方、第２図に示す輻射熱型の加熱構造に代え
操作軸３に熱板及びヒータを直結してバイメタル
に対して伝導構造とすることが考えられた。この
ような構造にすると、第３図に特性線ｄで示す如
く、Ａ点及びＢ点の中間部から上昇角度が大きく
なり、高地規制に適合するエミツシヨン特性が得
られることが解つた。しかして、伝導構造とし
て、かつ偏角補正機構を採用すれば、第３図のｄ
とｃとを接続した望ましい特性が得られることに
なる。 On the other hand, instead of the radiant heat type heating structure shown in FIG. 2, it has been considered to directly connect a heating plate and a heater to the operating shaft 3 to create a conductive structure for the bimetal. It has been found that with such a structure, the angle of rise increases from the midpoint between points A and B, as shown by characteristic line d in FIG. 3, and emission characteristics complying with the high altitude regulations can be obtained. However, if a conduction structure and a declination correction mechanism are adopted, d in Fig. 3
This results in a desirable characteristic that connects and c.
ところが、このような構造とする場合、第２図
に示す従来の構造に対して単に操作軸直結型ヒー
タ構造を採用しようとすると、操作軸３が軸受４
によつて片持梁構造となり、操作軸３に加わる軸
荷重が非常に大きくなつて、実際の使用に耐えう
る機械強度を得ることが困難となる。例えば操作
軸３がヒータ、熱板及びバイメタルなどの荷重に
よつて撓み、軸受４部分が損傷し、がたつきなど
を生じることになる。 However, in the case of such a structure, if an attempt is made to simply adopt a heater structure directly connected to the operating shaft compared to the conventional structure shown in FIG.
This results in a cantilever structure, and the axial load applied to the operating shaft 3 becomes extremely large, making it difficult to obtain mechanical strength that can withstand actual use. For example, the operating shaft 3 is bent by the load of the heater, hot plate, bimetal, etc., and the bearing 4 portion is damaged, causing rattling.
本発明はこのような事情に鑑みてなされたもの
で、第３図に示す特性線ｄ→ｃに亘る良好なチヨ
ーク弁開度の特性を充分な機械的強度を持つて実
現できる安定に優れた偏角補正形自動チヨーク装
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 circumstances, and is a highly stable valve that can realize a good valve opening characteristic over the characteristic line d→c shown in FIG. 3 with sufficient mechanical strength. An object of the present invention is to provide a declination correction type automatic tilting device.
本発明は前記目的を達成するため、気化器に付
設した円筒形のハウジングの一端壁に操作軸を軸
受を介して回動可能に挿通し、この操作軸のハウ
ジングへの挿入端側にコイル状のバイメタルの中
心部を支持させるとともに、このバイメタルの変
形部にチヨーク弁開動用レバーを連結する一方、
ハウジング内にバイメタルを加熱する電熱式ヒー
タを収納し、かつ操作軸のハウジングからの突出
端側に一定暖機域でチヨーク弁への急速開動指令
を与える偏角補正用チヨークピストンを連結して
いる偏角補正形自動チヨーク装置において、操作
軸をハウジング側操作軸とバイメタル側操作軸と
に分離し、かつバイメタル側操作軸とハウジング
側操作軸との間にデイスクを設け、ハウジング側
操作軸の挿入端側は、ハウジングの内周面に外周
部を回動可能に支持されたデイスクに嵌合され、
バイメタル側操作軸のデイスクと対向する側は、
鍔状の熱板を介して電熱式ヒータを固着するとと
もに熱板の外周をカツプ状の支持部材を介してデ
イスクに固設されているように構成したことにあ
る。
In order to achieve the above object, the present invention has an operating shaft rotatably inserted into one end wall of a cylindrical housing attached to a carburetor via a bearing, and a coiled While supporting the central part of the bimetal, and connecting the lever for opening the chiyoke valve to the deformed part of this bimetal,
An electric heater that heats the bimetal is housed in the housing, and a declination correction piston is connected to the protruding end of the operating shaft from the housing, which gives a command to quickly open the chiyoke valve in a certain warm-up range. In the declination correction type automatic tilt yoke device, the operating shaft is separated into a housing-side operating shaft and a bimetal-side operating shaft, and a disk is provided between the bimetal-side operating shaft and the housing-side operating shaft, and the housing-side operating shaft is The insertion end side is fitted into a disk whose outer periphery is rotatably supported on the inner periphery of the housing,
The side facing the disk of the bimetal side operating shaft is
The electrothermal heater is fixed via a brim-shaped hot plate, and the outer periphery of the hot plate is fixed to the disk via a cup-shaped support member.
以下、本発明の一実施例を第４図及び第５図を
参照して説明する。尚、本発明の主要構成となる
操作軸及び電熱構造を主に説明し、第１図及び第
２図に示す従来の構成と共通部分には、図の対応
部分に同一符号を付し、重複する説明は省略す
る。
An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. The operating shaft and electric heating structure, which are the main components of the present invention, will be mainly explained, and parts common to the conventional structure shown in FIGS. The explanation will be omitted.
本実施例に係る偏角補正形自動チヨーク装置で
は、操作軸３０に、その外周部がハウジング内面
に回動可能に支持された軸荷重分担用のデイスク
３１を設けている。このデイスク３１はハウジン
グへの軸受部分の操作軸３０Ａ（ハウジング側操
作軸）３０Ａとバイメタル支持部分の操作軸（バ
イメタル側操作軸）３０Ｂとの間に配置してい
る。また、このデイスク３１とバイメタル５との
間に位置して操作軸３０Ｂに鍔状の熱板３２を一
体に形成し、この熱板３２にヒータ３３を直接装
着している。 In the declination correction type automatic tilt yoke device according to this embodiment, the operation shaft 30 is provided with a disk 31 for sharing the shaft load, the outer peripheral portion of which is rotatably supported on the inner surface of the housing. This disk 31 is arranged between an operating shaft 30A (housing-side operating shaft) 30A of the bearing portion to the housing and an operating shaft 30B (bimetal-side operating shaft) of the bimetal support portion. Further, a flange-shaped hot plate 32 is integrally formed on the operating shaft 30B, located between the disk 31 and the bimetal 5, and a heater 33 is directly attached to this hot plate 32.
即ち、本実施例では操作軸３０の軸主部をバイ
メタル側とハウジングへの軸受側とに分離させた
構造とし、軸受部の操作軸３０Ａはハウジングを
構成するサーモカバー１Ｂへの軸受４とデイスク
３１とによつて両持梁状態として撓み防止を図つ
たものである。そして、このように強化された軸
構造の構成部材であるデイスク３１の一側面に、
バイメタル５を支持する他方の操作軸３０Ｂの一
端に形成した熱板３２を、カツプ状に形成された
金属製の支持部材３４によつて一体回転可能に連
結している。詳述すると、分離された操作軸３０
Ａのハウジングへの挿入端部に別部品から成るデ
イスク３１を一体に嵌合連結している。尚、ハウ
ジングへの軸受４部内方にはデイスク３１との間
に位置させてスラストワツシヤ３５を装着してい
る。 That is, in this embodiment, the shaft main part of the operating shaft 30 is structured to be separated into a bimetal side and a bearing side to the housing, and the operating shaft 30A of the bearing part is connected to the bearing 4 and the disk to the thermo cover 1B that constitutes the housing. 31, the beam is supported on both sides to prevent deflection. Then, on one side of the disk 31, which is a component of the shaft structure reinforced in this way,
A hot plate 32 formed at one end of the other operating shaft 30B that supports the bimetal 5 is rotatably connected to the bimetal 5 by a metal support member 34 formed in a cup shape. In detail, the separated operation shaft 30
A disk 31, which is a separate part, is integrally fitted and connected to the insertion end of A into the housing. A thrust washer 35 is mounted inside the bearing 4 of the housing and positioned between it and the disk 31.
また、デイスク３１は外周部を微少隙間を設け
てサーモカバー１Ｂの内周面に摺接状態で支持さ
せるとともに、外周部の一側面（バイメタル側）
をサーモカバー１Ｂとサーモハウジング１Ａとの
間に挾着したアース板兼用のスラストプレート３
６によつてスラスト方向荷重を吸収しうる如く接
触させている。このスラストプレート３６に対す
るデイスク３１の接触部３１Ａは、クロムメツ
キ、ニツケルメツキ又はテフロン（登録商標名）
コーテイングなどを施すことにより摺動抵抗の僅
少なものとしている。尚、サーモカバー１Ｂは樹
脂製であり、サーモハウジング１Ａは亜鉛又はア
ルミなどによつて構成したものである。デイスク
３１のハウジング締付具２２と対応する部分には
切欠３１Ｂ（第５図参照）を形成し、デイスク３
１が締付具２２を股ぐ構成としている。尚、切欠
３１Ｂの角度幅αは10〜20度である。即ち、デイ
スク３１は10〜20度の開動幅を有するもので充分
である。これは後に詳述するが、チヨーク弁開度
が空燃比に与える影響は開き始めの一定角度範囲
が最も大きいものであり、チヨーク弁の全開に接
近するに従つて、空燃比に与える影響は減少する
ため、例えば第３図のθ2〜θ3に相当する範囲のみ
チヨーク弁開度を補正すれば充分であるからであ
る。つまり、このようにデイスク３１によつて開
動幅を規制される操作軸３０Ａ，３０Ｂは10〜20
度の補正開度を有するものであればよい。尚、３
７，３８はヒータ３３に電流を供給するための接
触子であり、デイスク３１の軸心側に設けた同一
の取付軸３９によつて固着している。又、４０は
デイスク３１の外周部をスラストプレート３６に
安定に接触させるためのスプリングである。 Further, the outer circumferential portion of the disk 31 is supported in sliding contact with the inner circumferential surface of the thermo cover 1B with a slight gap, and one side of the outer circumferential portion (bimetal side)
Thrust plate 3, which also serves as a ground plate, is clamped between thermo cover 1B and thermo housing 1A.
6, they are brought into contact so as to be able to absorb the load in the thrust direction. The contact portion 31A of the disk 31 with respect to the thrust plate 36 is made of chrome plating, nickel plating, or Teflon (registered trademark name).
By applying coating etc., the sliding resistance is minimized. The thermo cover 1B is made of resin, and the thermo housing 1A is made of zinc or aluminum. A notch 31B (see FIG. 5) is formed in the portion of the disc 31 that corresponds to the housing fastener 22, and the disc 3
1 crosses the fastener 22. Note that the angular width α of the notch 31B is 10 to 20 degrees. That is, it is sufficient for the disc 31 to have an opening width of 10 to 20 degrees. This will be explained in detail later, but the influence of the Chiyork valve opening on the air-fuel ratio is greatest in a certain angle range at the beginning of opening, and the influence on the air-fuel ratio decreases as the Chiyork valve approaches full opening. Therefore, it is sufficient to correct the opening degree of the choke valve only in the range corresponding to θ 2 to θ 3 in FIG. 3, for example. In other words, the operating shafts 30A and 30B whose opening width is regulated by the disk 31 are 10 to 20
It is sufficient if it has a corrected opening degree of 100 degrees. In addition, 3
7 and 38 are contacts for supplying current to the heater 33, and are fixed by the same mounting shaft 39 provided on the axial center side of the disk 31. Further, 40 is a spring for stably bringing the outer peripheral portion of the disk 31 into contact with the thrust plate 36.
次に各操作軸３０Ａ，３０Ｂの連結及びヒータ
部構造を説明する。バイメタル側の操作軸３０Ｂ
のデイスク３１に対向する部分に設けた鍔状の熱
板３２と、これにその内周部を固着した支持部材
３４とが一体となつて、デイスク３１の一側面に
連結部材４１によつて連結されている。即ち、バ
イメタル５及び操作軸３０Ｂはその荷重をデイス
ク３１によつて分担されている。これにより、軸
受４側の操作軸３０Ａには過度の軸荷重が作用し
ない。支持部材３４をデイスク３１に連結する連
結部材４１の一端はアース板兼用のスラストプレ
ート３６に接触している。そして、熱板３２に直
接装着したヒータ３３のアース側の回路構造を成
している。つまり、リード線２０接触子３７取付
軸３９、接触子３８を介してヒータ３３に電熱用
の電流が供給され、熱板３２、支持部材３４、連
結部材４１及びアース板兼用のスラストプレート
３６を介して回路構成が完成している。 Next, the connection of each operating shaft 30A, 30B and the structure of the heater section will be explained. Bimetal side operating shaft 30B
A flange-shaped hot plate 32 provided at a portion facing the disk 31 and a supporting member 34 whose inner circumferential portion is fixed to this are integrated and connected to one side of the disk 31 by a connecting member 41. has been done. That is, the load of the bimetal 5 and the operating shaft 30B is shared by the disk 31. This prevents excessive shaft load from acting on the operating shaft 30A on the bearing 4 side. One end of a connecting member 41 that connects the supporting member 34 to the disk 31 is in contact with a thrust plate 36 that also serves as a ground plate. This constitutes a circuit structure on the ground side of the heater 33 that is directly attached to the hot plate 32. That is, electric heating current is supplied to the heater 33 through the lead wire 20, contact 37, mounting shaft 39, and contact 38, and is supplied to the heater 33 through the heating plate 32, the support member 34, the connecting member 41, and the thrust plate 36, which also serves as a ground plate. The circuit configuration has been completed.
以上のような実施例の装置によると、ヒータ３
３が熱板３２を有する操作軸３０Ｂを介してバイ
メタル５に伝導熱を供給できるので、バイメタル
によるチヨーク開度は、第３図の特性線ｄに示す
ものとなり、これに加えて偏角補正機構により特
性線ｃに移行するものとなり、前述した如く高地
規制などに適合するエミツシヨン特性を充分に満
足するものとなるのは勿論であるが、このような
特性を実現するための機構が、デイスク３１に基
づく操作軸３０の支持構造により安定したものと
して提供できるようになり、従来実現の困難であ
つた具体的な構成が提供できる。 According to the device of the above embodiment, the heater 3
3 can supply conductive heat to the bimetal 5 through the operation shaft 30B having the heat plate 32, the bimetal yoke opening degree is as shown by the characteristic line d in FIG. As a result, the emission characteristics shift to characteristic line c, and as mentioned above, it goes without saying that the emission characteristics fully satisfy the high altitude regulations, etc., but the mechanism for realizing such characteristics is The support structure of the operation shaft 30 based on the above structure allows a stable structure to be provided, and a specific configuration that has been difficult to realize in the past can be provided.
特に、実施例の如く操作軸３０を軸受側３０Ａ
とバイメタル側３０Ｂとに分離しこれを支持部材
３４によつて連結することにより、ヒータ３３を
軸心部に配置しうる構成とすれば、ヒータ３３の
熱を直接かつ良好にバイメタル５に伝達できる構
成が実現でき、均一な熱作用が良好に得られるも
のである。 In particular, as in the embodiment, the operating shaft 30 is placed on the bearing side 30A.
If the configuration is such that the heater 33 can be placed at the axial center by separating the bimetal side 30B and the bimetal side 30B and connecting them by the support member 34, the heat of the heater 33 can be directly and efficiently transferred to the bimetal 5. The structure can be realized and a uniform heat effect can be obtained satisfactorily.
尚、前記実施例では熱板３２に単一のヒータ３
３をを設けいわば一段加熱的な構成を図示した
が、本発明はこのようなものに限らず、例えば第
６図に示すように、熱板３２に対して複数のヒー
タ３３Ａ，３３Ｂを設け、夫々に対して接触子３
８Ａ，３８Ｂを対応させた構成としてもよい。こ
の場合、一方のヒータ３３Ａは通常の加熱作用を
行わせる第一次加熱用とし、他方のヒータ３３Ｂ
は所定の時間遅れで加熱第二次加熱用とする。 In the above embodiment, a single heater 3 is provided on the hot plate 32.
Although the present invention is not limited to this configuration, for example, as shown in FIG. 6, a plurality of heaters 33A and 33B are provided for the hot plate 32, 3 contacts for each
A configuration in which 8A and 38B are made to correspond may also be used. In this case, one heater 33A is used for primary heating to perform a normal heating action, and the other heater 33B is used for primary heating.
is used for secondary heating after a predetermined time delay.
このような構成によると、加熱作用を段階的に
明確に行えるので、例えば第３図に示す特性線ｄ
のＢ点に達するまでのチヨーク弁開度の上昇角度
の明確な立上り特性を得るうえで効果的なものと
なる。 With such a configuration, the heating action can be clearly performed in stages, so that, for example, the characteristic line d shown in FIG.
This is effective in obtaining a clear rising characteristic of the rising angle of the valve opening until reaching point B.
尚、第６図に示す実施例は第５図に示すものと
比べてヒータ及びその回路構成以外は共通である
から第６図において第５図と共通部分には同一符
号を付してその説明を省略する。尚、第６図にお
いて５０は二次回路を構成するための接点、５１
はデイスクバイメタル、５２は接点を有する導通
板ばね、５３は導通板、５４は絶縁板、５５はリ
ベツトである。即ち、この二次電熱回路は、デイ
スクバイメタル５１の一次加熱による加熱作用を
受けて一定角度に達した場合に接点５２を接点５
０に接触させるように構成したものである。 The embodiment shown in FIG. 6 is the same as the embodiment shown in FIG. 5 except for the heater and its circuit configuration, so in FIG. 6, the same parts as those in FIG. omitted. In addition, in FIG. 6, 50 is a contact point for configuring a secondary circuit, and 51 is a contact point for configuring a secondary circuit.
52 is a conductive plate spring having contacts, 53 is a conductive plate, 54 is an insulating plate, and 55 is a rivet. That is, this secondary electric heating circuit connects the contact 52 to the contact 5 when a certain angle is reached due to the heating effect caused by the primary heating of the disc bimetal 51.
0.
本発明は以上のように、ハウジング側操作軸と
バイメタル側操作軸とを設け、ハウジング側操作
軸の挿入端側をデイスクで支持し、バイメタル側
操作軸にヒータを固着して支持部材を介してデイ
スクで支持したため、操作軸の軸受構造の強化と
加熱効率の向上とが同時に図れ、例えばエミツシ
ヨン特性や燃費の向上が機械的な構成面での問題
点を克服して確実に実現できるようになり、通常
車両は勿論のこと特に高地規制用の車両などとし
て、実際利用に好適したものが提供できるように
なる。
As described above, the present invention includes a housing-side operating shaft and a bimetal-side operating shaft, the insertion end side of the housing-side operating shaft is supported by a disk, a heater is fixed to the bimetal-side operating shaft, and the heater is fixed to the bimetal-side operating shaft through a support member. Because it is supported by a disk, it is possible to strengthen the bearing structure of the operating shaft and improve heating efficiency at the same time, making it possible to reliably achieve, for example, improvements in emission characteristics and fuel efficiency by overcoming mechanical configuration problems. This makes it possible to provide vehicles that are suitable for practical use, not only as regular vehicles, but also as vehicles for high-altitude regulations in particular.
第１図は偏角補正機構を示す概略図、第２図は
従来の構造を示す要部断面図、第３図はチヨーク
弁の開度特性を示す特性線図、第４図及び第５図
は本発明の一実施例を示すもので、第４図は要部
断面図、第５図は第４図のＶ−Ｖ線断面図、第６
図は本発明の他の実施例を示す要部断面図であ
る。
１……気化器、２……ハウジング、４……軸
受、５……バイメタル、７……チヨーク弁開動用
レバー、１０……偏角補正用チヨークピストン、
３０，３０Ａ，３０Ｂ……操作軸、３１……デイ
スク、３２……熱板。
Fig. 1 is a schematic diagram showing the declination correction mechanism, Fig. 2 is a cross-sectional view of the main part showing the conventional structure, Fig. 3 is a characteristic diagram showing the opening characteristics of the chiyork valve, Figs. 4 and 5 4 shows an embodiment of the present invention, FIG. 4 is a sectional view of a main part, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIG.
The figure is a sectional view of a main part showing another embodiment of the present invention. 1... Carburetor, 2... Housing, 4... Bearing, 5... Bimetal, 7... Lever for opening the chiyoke valve, 10... Chiyoke piston for declination correction,
30, 30A, 30B...operation axis, 31...disc, 32...heat plate.
Claims (1)
壁に操作軸を軸受を介して回動可能に挿通し、こ
の操作軸の前記ハウジングへの挿入端側にコイル
状のバイメタルの中心部を支持させるとともに、
このバイメタルの変形部にチヨーク弁開動用レバ
ーを連結する一方、前記ハウジング内に前記バイ
メタルを加熱する電熱式ヒータを収納し、かつ前
記操作軸の前記ハウジングからの突出端側に一定
暖機域でチヨーク弁への急速開動指令を与える偏
角補正用のチヨークピストンを連結している偏角
補正形自動チヨーク装置において、前記操作軸を
ハウジング側操作軸とバイメタル側操作軸とに分
離し、かつ該バイメタル側操作軸とハウジング側
操作軸との間にデイスクを設け、ハウジング側操
作軸の前記挿入端側は、前記ハウジングの内周面
に外周部を回動可能に支持された前記デイスクに
嵌合され、前記バイメタル側操作軸の該デイスク
と対向する側は、鍔状の熱板を介して前記電熱式
ヒータを固着するとともに該熱板の外周をカツプ
状の支持部材を介して前記デイスクに固設されて
いることを特徴とする偏角補正自動チヨーク装
置。1. An operating shaft is rotatably inserted through a bearing into one end wall of a cylindrical housing attached to the carburetor, and a center portion of a coiled bimetal is supported on the insertion end side of the operating shaft into the housing. With,
A lever for opening the chiyoke valve is connected to the deformed part of the bimetal, and an electric heater for heating the bimetal is housed in the housing, and the end of the operating shaft protruding from the housing is heated in a certain warming range. In a declination correction type automatic chute yoke device in which a declination correction piston is connected to give a quick opening command to a chyoke valve, the operating shaft is separated into a housing side operating shaft and a bimetal side operating shaft, and A disk is provided between the bimetal-side operating shaft and the housing-side operating shaft, and the insertion end side of the housing-side operating shaft is fitted into the disk whose outer periphery is rotatably supported on the inner peripheral surface of the housing. The side of the bimetal-side operating shaft facing the disk fixes the electric heater via a brim-shaped heating plate, and connects the outer periphery of the heating plate to the disk via a cup-shaped support member. An automatic declination correction device characterized by being permanently installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20031182A JPS5990748A (en) | 1982-11-17 | 1982-11-17 | Deflection angle correction type automatic choking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20031182A JPS5990748A (en) | 1982-11-17 | 1982-11-17 | Deflection angle correction type automatic choking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5990748A JPS5990748A (en) | 1984-05-25 |
| JPH0424541B2 true JPH0424541B2 (en) | 1992-04-27 |
Family
ID=16422197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20031182A Granted JPS5990748A (en) | 1982-11-17 | 1982-11-17 | Deflection angle correction type automatic choking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5990748A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50132329A (en) * | 1974-05-14 | 1975-10-20 | ||
| JPS55153840A (en) * | 1979-05-16 | 1980-12-01 | Hitachi Ltd | Carburetor choke mechanism |
-
1982
- 1982-11-17 JP JP20031182A patent/JPS5990748A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50132329A (en) * | 1974-05-14 | 1975-10-20 | ||
| JPS55153840A (en) * | 1979-05-16 | 1980-12-01 | Hitachi Ltd | Carburetor choke mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5990748A (en) | 1984-05-25 |
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