JP2005113717A - Throttle body with fuel injection valve and die device for molding throttle body - Google Patents

Throttle body with fuel injection valve and die device for molding throttle body Download PDF

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JP2005113717A
JP2005113717A JP2003346215A JP2003346215A JP2005113717A JP 2005113717 A JP2005113717 A JP 2005113717A JP 2003346215 A JP2003346215 A JP 2003346215A JP 2003346215 A JP2003346215 A JP 2003346215A JP 2005113717 A JP2005113717 A JP 2005113717A
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intake passage
throttle body
injection valve
valve
axis
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Hiroshige Akiyama
裕茂 秋山
Toshiyuki Sugimoto
利幸 杉本
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Keihin Corp
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Keihin Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost by enabling the molding of a valve storing chamber and an intake passage with the same die in a throttle body with a fuel injection valve. <P>SOLUTION: In the throttle body with the fuel injection valve, the valve container chamber 7 having a supporting hole 9 at a front end is formed in one side wall of the throttle body 1 having the intake passage 2, the fuel injection valve 10 fitting an injection valve part 10a in the supporting hole 9 is stored in the valve container chamber 7, and an axis B of the supporting hole 9 is tilted by a predetermined angle θ with respect to an axis A of the intake passage 2 so that the injection valve part 10a turns downstream side of the intake passage 2. The valve container chamber 7 is divergently formed by approximately paralleling an inside surface 7a at the suction passage 2 side to the axis A of the suction passage 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は，スロットルバルブにより開閉される吸気道を有するスロットルボディの一側壁に，前端に支持孔を有する弁収容室を形成し，この弁収容室には，前記支持孔に前端の噴射弁部を嵌合する燃料噴射弁を収容し，前記噴射弁部が吸気道の下流側を指向するように，前記支持孔の軸線を吸気道の軸線に対して傾けた，燃料噴射弁付きスロットルボディの改良と，前記スロットルボディの成形のための金型装置に関する。   According to the present invention, a valve housing chamber having a support hole at the front end is formed on one side wall of a throttle body having an intake passage that is opened and closed by a throttle valve. The valve housing chamber has an injection valve portion at the front end at the support hole. Of the throttle body with a fuel injection valve in which the axis of the support hole is inclined with respect to the axis of the intake passage so that the injection valve portion is directed downstream of the intake passage. The present invention relates to an improvement and a mold apparatus for molding the throttle body.

従来のかゝる燃料噴射弁付きスロットルボディにおいては，下記特許文献１に開示されるように，燃料噴射弁を収容する弁収容室は円筒状に形成され，且つ燃料噴射弁の噴射弁部が嵌合する支持孔と共に，吸気道の軸線に対して傾斜して配置されている。
実公平４−４７４２０号公報 In the conventional throttle body with a fuel injection valve, as disclosed in Patent Document 1 below, the valve storage chamber for storing the fuel injection valve is formed in a cylindrical shape, and the injection valve portion of the fuel injection valve is fitted. Along with the supporting hole to be joined, it is arranged inclined with respect to the axis of the intake passage.
Japanese Utility Model Publication 4-47420

上記のように，燃料噴射弁を収容する弁収容室が円筒状に形成され，且つ支持孔と共に，吸気道の軸線に対して傾斜して配置されるものでは，弁収容室と吸気道とを同一の金型により成形することはできず，その成形のための金型装置を複雑にしており，これが燃料噴射弁付きスロットルボディの製造コストの低減の障害となっている。   As described above, in the case where the valve accommodating chamber for accommodating the fuel injection valve is formed in a cylindrical shape and is inclined with respect to the axis of the intake passage along with the support hole, the valve accommodating chamber and the intake passage are separated from each other. It cannot be molded by the same mold, and the mold apparatus for the molding is complicated, which is an obstacle to the reduction of the manufacturing cost of the throttle body with a fuel injection valve.

本発明は，かゝる事情に鑑みてなされたもので，弁収容室と吸気道とを同一の金型により成形することを可能にして，製造コストの低減をもたらし得る，前記燃料噴射弁付きスロットルボディ及び，そのスロットルボディを成形するための構造簡単な金型装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and it is possible to mold the valve accommodating chamber and the intake passage with the same mold, and can reduce the manufacturing cost. An object of the present invention is to provide a throttle body and a mold device having a simple structure for molding the throttle body.

上記目的を達成するために，本発明は，スロットルバルブにより開閉される吸気道を有するスロットルボディの一側壁に，前端に支持孔を有する弁収容室を形成し，この弁収容室には，前記支持孔に前端の噴射弁部を嵌合する燃料噴射弁を収容し，前記噴射弁部が吸気道の下流側を指向するように，前記支持孔の軸線を吸気道の軸線に対して傾けた，燃料噴射弁付きスロットルボディにおいて，前記弁収容室を，それの吸気道側内側面を吸気道の軸線と略平行させて末広がり状に形成したことを第１の特徴とする。   In order to achieve the above object, according to the present invention, a valve housing chamber having a support hole at the front end is formed on one side wall of a throttle body having an intake passage that is opened and closed by a throttle valve. A fuel injection valve that fits the injection valve portion at the front end is accommodated in the support hole, and the axis of the support hole is inclined with respect to the axis of the intake passage so that the injection valve portion faces the downstream side of the intake passage In the throttle body with a fuel injection valve, the first feature is that the valve housing chamber is formed in a divergent shape with the inner surface of the intake passage side substantially parallel to the axis of the intake passage.

尚，前記支持孔は，後述する本発明の実施例中の段付き支持孔９に対応する。   The support hole corresponds to a stepped support hole 9 in an embodiment of the present invention described later.

また本発明は，第１の特徴に加えて，前記支持孔と吸気道との間に，前記噴射弁部からの噴射燃料を吸気道に誘導する噴射燃料誘導路をスロットルボディに設け，この噴射燃料誘導路を，それの吸気道と反対側の内側面を吸気道の軸線と略平行させつゝ末広がり状に形成したことを第２の特徴とする。   According to the present invention, in addition to the first feature, an injection fuel guiding path for guiding the injected fuel from the injection valve portion to the intake passage is provided in the throttle body between the support hole and the intake passage. A second feature is that the fuel guide passage is formed in a widening shape with the inner surface on the opposite side to the intake passage substantially parallel to the axis of the intake passage.

さらに本発明は，第２の特徴におけるスロットルボディを成形する金型装置であって，吸気道の軸線に沿って互いに開閉する一対の金型を備え，その一方の金型に吸気道の上流側半部と弁収容室とにそれぞれ対応する第１凸状部と第２凸状部とを設け，他方の金型に吸気道の下流側半部と噴射燃料誘導部とにそれぞれ対応する第３凸状部と第４凸状部とを設けたことを第３の特徴とする。   Furthermore, the present invention is a mold apparatus for molding the throttle body according to the second feature, comprising a pair of molds that open and close each other along the axis of the intake passage, and one of the molds is located upstream of the intake passage. A first convex portion and a second convex portion respectively corresponding to the half portion and the valve accommodating chamber are provided, and third molds respectively corresponding to the downstream half portion of the intake passage and the injected fuel guiding portion in the other mold. A third feature is that the convex portion and the fourth convex portion are provided.

尚，前記一方の金型及び他方の金型は，後述する本発明の実施例中の第１金型２１及び第２金型２２にそれぞれ対応する。   The one mold and the other mold correspond to the first mold 21 and the second mold 22 in the embodiments of the present invention to be described later.

本発明の第１の特徴によれば，弁収容室と，吸気道の少なくとも上流側半部とを，吸気道の軸線に沿って進退する同一の金型により成形することができ，製造コストの低減を図ることができる。   According to the first feature of the present invention, the valve storage chamber and at least the upstream half of the intake passage can be formed by the same mold that advances and retreats along the axis of the intake passage. Reduction can be achieved.

また本発明の第２の特徴によれば，噴射燃料誘導路と，吸気道の少なくとも上流側半部とを，吸気道の軸線に沿って進退する同一の金型により成形することができ，弁収容室と，吸気道の少なくとも上流側半部とを同一の金型により成形し得ることゝ相俟って，製造コストの更なる低減を図ることができる。   According to the second feature of the present invention, the injected fuel guide path and at least the upstream half of the intake passage can be formed by the same mold that advances and retreats along the axis of the intake passage. Combined with the fact that the storage chamber and at least the upstream half of the intake passage can be formed by the same mold, the manufacturing cost can be further reduced.

さらに本発明の第３の特徴によれば，吸気道の軸線に沿って互いに開閉する一対の金型によって，吸気道，弁収容室及び噴射燃料誘導路を成形することができ，したがって金型装置を，金型数の少ない簡単なものとして，安価に提供することができる。   Further, according to the third feature of the present invention, the intake passage, the valve accommodating chamber and the injected fuel guide passage can be formed by a pair of molds which open and close along the axis of the intake passage. Can be provided inexpensively as a simple product with a small number of molds.

本発明の実施の形態を，添付図面に示す本発明の好適な実施例に基づいて以下に説明する。   Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

図１は本発明の実施例に係る自動二輪車用エンジンの燃料噴射弁付きスロットルボディの側面図，図２は図１の２−２線断面図（但し，スロットルボディのみを示す。），図３はスロットルボディの成形用金型装置を一部開き状態で示す縦断側面図，図４は図３の４−４線断面図である。   FIG. 1 is a side view of a throttle body with a fuel injection valve of a motorcycle engine according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 (only the throttle body is shown), FIG. Fig. 4 is a longitudinal side view showing the throttle body molding die device in a partially opened state, and Fig. 4 is a sectional view taken along line 4-4 of Fig. 3.

先ず，図１及び図２により，燃料噴射弁付きスロットルボディについて説明する。   First, a throttle body with a fuel injection valve will be described with reference to FIGS.

自動二輪車用エンジンのスロットルボディ１は，その中心部を貫いてエンジンの吸気ポートに連なる吸気道２と，この吸気道２の中央部で，それの軸線Ａと直交する軸線Ｃを持つバルブ軸孔３とを有し，この吸気道２の中央部には，これを開閉するバタフライ型のスロットルバルブ４が配設される。このスロットルバルブ４は，前記バルブ軸孔３に回転自在に支承されるバルブ軸５に取り付けられる。   A throttle body 1 of a motorcycle engine has a valve shaft hole having an intake passage 2 passing through the central portion thereof and continuing to an intake port of the engine, and an axis C perpendicular to the axis A at the central portion of the intake passage 2. 3, and a butterfly throttle valve 4 for opening and closing the intake passage 2 is disposed at the center of the intake passage 2. The throttle valve 4 is attached to a valve shaft 5 that is rotatably supported in the valve shaft hole 3.

バルブ軸孔３の側方において，スロットルボディ１の一側壁には，互いに隔壁６を挟んで並ぶ弁収容室７及び噴射燃料誘導路８が形成される。弁収容室７はスロットルボディ１の上流側に向かって開口するように配置され，また噴射燃料誘導路８はスロットルボディ１の下流側と合流するように配置され，これら弁収容室７及び噴射燃料誘導路８を相互に連通する段付き支持孔９が隔壁６に設けられる。この段付き支持孔９は，噴射燃料誘導路８側の小径孔９ａと，弁収容室７側の大径孔９ｂとからなり，且つその軸線Ｂが吸気道２の下流側に行くにつれて吸気道２の軸線Ａに近づくように，その軸線Ａに対して一定角度θ傾斜して配置される。   On the side of the valve shaft hole 3, a valve housing chamber 7 and an injected fuel guide path 8 are formed on one side wall of the throttle body 1 with the partition wall 6 therebetween. The valve housing chamber 7 is disposed so as to open toward the upstream side of the throttle body 1, and the injected fuel guide path 8 is disposed so as to merge with the downstream side of the throttle body 1. A stepped support hole 9 that communicates the guide path 8 with each other is provided in the partition wall 6. The stepped support hole 9 includes a small-diameter hole 9 a on the injected fuel guiding path 8 side and a large-diameter hole 9 b on the valve accommodating chamber 7 side, and the intake path as its axis B goes downstream of the intake path 2. It is arranged so as to be closer to the second axis A and inclined at a constant angle θ with respect to the axis A.

こゝで，図１において，吸気道２，弁収容室７及び噴射燃料誘導路８の形状について詳しく説明する。   Here, in FIG. 1, the shapes of the intake passage 2, the valve accommodating chamber 7 and the injected fuel guiding path 8 will be described in detail.

吸気道２は，スロットルバルブ４が配置される中央部の円筒面２ａと，この円筒面２ａの一端から上流側に向かって僅かに拡径しながら延びる上流側円錐面２ｂと，円筒面２ａの他端から下流側に向かって僅かに拡径しながら延びる下流側円錐面２ｃとで構成され，これら円筒面２ａ，上流側円錐面２ｂ及び下流側円錐面２ｃは軸線Ａを共有している。   The intake passage 2 includes a central cylindrical surface 2a where the throttle valve 4 is disposed, an upstream conical surface 2b extending slightly from one end of the cylindrical surface 2a toward the upstream side, and a cylindrical surface 2a. It is composed of a downstream conical surface 2c extending slightly from the other end toward the downstream side, and these cylindrical surface 2a, upstream conical surface 2b and downstream conical surface 2c share the axis A.

弁収容室７は，これの吸気道２上流側の開放面に向かって末広がり状に形成される。その際，弁収容室７の，吸気道２側の内側面７ａは，吸気道２の軸線Ａと略平行するように形成され（正確には，吸気道２の上流側に向かって軸線Ａにやゝ近づくように型抜き勾配が該内側面７ａに付与される。），それと反対側の内側面７ｂは，段付き支持孔９の軸線Ｂと略平行するように形成される。   The valve storage chamber 7 is formed in a divergent shape toward the open surface upstream of the intake passage 2. At that time, the inner surface 7a of the valve accommodating chamber 7 on the intake passage 2 side is formed so as to be substantially parallel to the axis A of the intake passage 2 (more precisely, the axis A is directed toward the upstream side of the intake passage 2). A die-cutting gradient is imparted to the inner side surface 7a so as to approach the flange.) The inner side surface 7b on the opposite side is formed so as to be substantially parallel to the axis B of the stepped support hole 9.

噴射燃料誘導路８は，これの吸気道２下流側に合流する開放面に向かって末広がり状に形成される。その際，噴射燃料誘導路８の，吸気道２と反対側の内側面８ａは，吸気道２の軸線Ａと略平行するように形成され（正確には，吸気道２の下流側に向かって軸線Ａからやゝ遠ざかるように型抜き勾配が該内側面８ａに付与される。），それと反対側の内側面８ｂは，隔壁６から離れるにつれて吸気道２に近づくように形成される。   The injected fuel guide path 8 is formed in a divergent shape toward an open surface that merges downstream of the intake passage 2. At that time, the inner surface 8a of the injected fuel guide path 8 on the opposite side to the intake passage 2 is formed so as to be substantially parallel to the axis A of the intake passage 2 (to be exact, toward the downstream side of the intake passage 2). A die-drawing gradient is applied to the inner side surface 8a so as to be far from the axis A.) The inner side surface 8b opposite to the inner side surface 8b is formed so as to approach the intake passage 2 as the distance from the partition wall 6 increases.

次に，スロットルボディ１に取り付けられる燃料噴射弁１０について説明する。   Next, the fuel injection valve 10 attached to the throttle body 1 will be described.

この燃料噴射弁１０は，前端側から小径の噴射弁部１０ａ，大径のソレノイド部１０ｂ，噴射弁部１０ａ及び中間径の燃料入口筒部１０ｃを順次連ねて構成され，その噴射弁部１０ａが，段付き支持孔９の小径孔９ａに嵌合され，ソレノイド部１０ｂが弁収容室７に収められる。その噴射弁部１０ａの先端部は噴射燃料誘導路８に突入させ，大径孔９ｂには，噴射弁部１０ａの外周面に密接するシール部材１２が装着される。燃料入口筒部１０ｃは，弁収容室７の開放面から突出するように配置され，その外周に，燃料供給導管１７に連なるジョイント１３がシール部材１４を介して嵌装される。このジョイント１３は，ボルト１５によりスロットルボディ１に固着されるもので，燃料噴射弁１０のソレノイド部１０ｂは，そのジョイント１３と，段付き支持孔９を有する隔壁６とで挟持されることになる。   The fuel injection valve 10 is configured by sequentially connecting a small diameter injection valve portion 10a, a large diameter solenoid portion 10b, an injection valve portion 10a, and an intermediate diameter fuel inlet cylinder portion 10c from the front end side. , The small diameter hole 9 a of the stepped support hole 9 is fitted, and the solenoid part 10 b is accommodated in the valve accommodating chamber 7. The tip of the injection valve portion 10a is inserted into the injected fuel guide path 8, and the large diameter hole 9b is fitted with a seal member 12 that is in close contact with the outer peripheral surface of the injection valve portion 10a. The fuel inlet cylinder portion 10c is disposed so as to protrude from the open surface of the valve accommodating chamber 7, and a joint 13 connected to the fuel supply conduit 17 is fitted on the outer periphery thereof via a seal member 14. The joint 13 is fixed to the throttle body 1 by a bolt 15, and the solenoid portion 10 b of the fuel injection valve 10 is sandwiched between the joint 13 and the partition wall 6 having the stepped support hole 9. .

この実施例の作用について説明する。   The operation of this embodiment will be described.

エンジンの運転中，スロットルボディ１において，スロットルバルブ４の開度に応じて吸気道２を空気が流れると共に，燃料噴射弁１０のソレノイド部１０ｂの作動により燃料入口筒部１０ｃに流入した燃料が噴射弁部１０ａから噴射燃料誘導路８に向けて噴射されると，その燃料は噴射燃料誘導路８で噴霧フォーム１６を形成しながら霧化した後，スロットルバルブ４の下流側で上記空気及び燃料が混合するので，良好な混合気を生成することができる。そして，この混合気はエンジンに吸入される。   During operation of the engine, in the throttle body 1, air flows through the intake passage 2 in accordance with the opening of the throttle valve 4, and fuel that has flowed into the fuel inlet cylinder portion 10c by the operation of the solenoid portion 10b of the fuel injection valve 10 is injected. When the fuel is injected from the valve portion 10 a toward the injected fuel guiding path 8, the fuel is atomized while forming the spray foam 16 in the injected fuel guiding path 8, and then the air and fuel are downstream of the throttle valve 4. As a result of mixing, a good mixture can be generated. This air-fuel mixture is sucked into the engine.

上記燃料噴射弁１０は，ソレノイド部１０ｂの上記作動に伴ない多少とも騒音を発するが，噴射弁部１０ａ及びソレノイド部１０ｂが弁収容室７に収められているから，上記騒音の外部への漏れを弁収容室７の周壁により遮断して，燃料噴射弁１０付きのスロットルボディ１の静粛性を高めることができる。   The fuel injection valve 10 generates some noise as the solenoid unit 10b is operated. However, since the injection valve unit 10a and the solenoid unit 10b are housed in the valve storage chamber 7, the noise leaks to the outside. Can be blocked by the peripheral wall of the valve housing chamber 7 to improve the silence of the throttle body 1 with the fuel injection valve 10.

次に，上記スロットルボディ１を鋳造する際に使用する金型装置について，図３及び図４により説明する。   Next, a mold apparatus used when casting the throttle body 1 will be described with reference to FIGS.

この金型装置は，吸気道２の軸線Ａに沿って互いに開閉する第１及び第２金型２１，２２と，バルブ軸孔３の軸線Ｃに沿って互いに開閉する第３及び第４金型２３，２４とで構成される。   The mold apparatus includes first and second molds 21 and 22 that open and close along the axis A of the intake passage 2 and third and fourth molds that open and close along the axis C of the valve shaft hole 3. 23, 24.

第１金型２１は，吸気道２の，バルブ軸孔３の軸線Ｃを境とする上流側半部に対応する第１凸状部２１ｂと，弁収容室７に対応する第２凸状部２１ｃを第１金型ベース２１ａから突出させてなるもので，その第１金型ベース２１ａの内側面は，スロットルボディ１の，吸気道２下流側の端面に対応した形状を有する。   The first mold 21 includes a first convex portion 21 b corresponding to the upstream half of the intake passage 2 with the axis C of the valve shaft hole 3 as a boundary, and a second convex portion corresponding to the valve accommodating chamber 7. 21c protrudes from the first mold base 21a, and the inner surface of the first mold base 21a has a shape corresponding to the end surface of the throttle body 1 on the downstream side of the intake passage 2.

第２金型２２は，吸気道２の，バルブ軸孔３の軸線Ｃを境とする上流側半部に対応する第３凸状部２２ｂと，噴射燃料誘導路８に対応する第４凸状部２２ｃを第２金型ベース２２ａから突出させてなるもので，その第２金型ベース２２ａの内側面は，スロットルボディ１の，吸気道２下流側の端面に対応した形状を有する。   The second mold 22 includes a third convex portion 22 b corresponding to the upstream half of the intake passage 2 with the axis C of the valve shaft hole 3 as a boundary, and a fourth convex shape corresponding to the injected fuel guide path 8. The portion 22c is projected from the second mold base 22a, and the inner surface of the second mold base 22a has a shape corresponding to the end surface of the throttle body 1 on the downstream side of the intake passage 2.

第３金型２３の内側面には，スロットルボディ１外周面の，バルブ軸孔３の一端側半周面に対応した形状が付与されると共に，その内側面の中心部には，バルブ軸孔３の一半部に対応する第１中子ピン２３ａが突設される。また第４金型２４の内側面には，スロットルボディ１外周面の，バルブ軸孔３の他端側半周面に対応した形状が付与されると共に，その内側面の中心部には，バルブ軸孔３の他半部に対応する第２中子ピン２４ａが突設される。   The inner surface of the third mold 23 is provided with a shape corresponding to the outer circumferential surface of the throttle body 1 corresponding to the half circumferential surface of the one end side of the valve shaft hole 3, and the valve shaft hole 3 is formed at the center of the inner surface. A first core pin 23a corresponding to one half is projected. In addition, the inner surface of the fourth mold 24 is provided with a shape corresponding to the outer peripheral surface of the throttle body 1 and the other peripheral surface of the other end of the valve shaft hole 3. A second core pin 24a corresponding to the other half portion of the hole 3 is projected.

上記第１〜第４金型２１〜２４を閉じたとき，第１凸状部２１ｂ及び第３凸状部２２ｂは先端面を互いに当接させ，また第１中子ピン２３ａ及び第２中子ピン２４ａも先端面を互いに当接させるものであるが，第１凸状部２１ｂ及び第３凸状部部２２ｂの先端面には，両中子ピン２３ａ，２４ａの外周面の半周面を受容する半円状の凹部２６，２７がそれぞれ形成されていて，両凸状部部２１ｂ，２１ｃと両中子ピンピン２３ａ，２４ａとの干渉を回避するようになっている。   When the first to fourth molds 21 to 24 are closed, the first convex portion 21b and the third convex portion 22b are brought into contact with each other at the tip surfaces, and the first core pin 23a and the second core The pin 24a also makes the tip surfaces contact each other, but the tip surfaces of the first convex portion 21b and the third convex portion 22b receive the half peripheral surfaces of the outer peripheral surfaces of the core pins 23a and 24a. The semicircular concave portions 26 and 27 are formed to avoid interference between the convex portions 21b and 21c and the core pin pins 23a and 24a.

スロットルボディ１の鋳造に当たっては，第１及び第２金型２１，２２を吸気道２の軸線Ａに沿って閉じると共に，第３及び第４金型２３，２４をバルブ軸孔３の軸線Ｃに沿って閉じ，これら４個の金型２１〜２４により画成されるキャビティに溶湯を射出することにより，スロットルボディ１を成形する。   In casting the throttle body 1, the first and second molds 21 and 22 are closed along the axis A of the intake passage 2, and the third and fourth molds 23 and 24 are placed on the axis C of the valve shaft hole 3. The throttle body 1 is molded by injecting molten metal into a cavity defined by these four molds 21 to 24.

その際，吸気道２の上流側半部と弁収容室７とは，第１金型２１の第１及び第２凸状部２１ｂ，２１ｃによりそれぞれ成形され，スロットルボディ１の，吸気道２上流側端面は第１金型ベース２１ａにより成形される。しかも，第１凸状部２１ｂにより成形される吸気道２の上流側半部は，その上流端に向かって拡径する円錐状をなし，また第２凸状部２１ｃにより成形される弁収容室７は，開放面に向かって末広がり状をなすと共に，それの吸気道２側の内側面７ａを吸気道２の軸線Ａに略平行させているから，第１金型２１を吸気道２の軸線Ａに沿って後退させれば，第１及び第２凸状部２１ｂ，２１ｃをスロットルボディ１から離型することができる。   At that time, the upstream half of the intake passage 2 and the valve accommodating chamber 7 are formed by the first and second convex portions 21b and 21c of the first mold 21, respectively, and the throttle body 1 upstream of the intake passage 2 is formed. The side end surface is formed by the first mold base 21a. Moreover, the upstream half of the intake passage 2 formed by the first convex portion 21b has a conical shape whose diameter increases toward the upstream end, and the valve accommodating chamber is formed by the second convex portion 21c. 7 has a divergent shape toward the open surface, and its inner surface 7a on the intake passage 2 side is substantially parallel to the axis A of the intake passage 2, so that the first mold 21 is connected to the axis of the intake passage 2. When retracted along A, the first and second convex portions 21 b and 21 c can be released from the throttle body 1.

また吸気道２の下流側半部と噴射燃料誘導路８とは，第２金型２２の第３及び第４凸状部２２ｂ，２２ｃによりそれぞれ成形され，スロットルボディ１の，吸気道２下流側端面は第２金型ベース２２ａにより成形される。しかも，第３凸状部２２ｂにより成形される吸気道２の下流側半部は，その上流端に向かって拡径する円錐状をなし，また第４凸状部２２ｃにより成形される噴射燃料誘導路８は，開放面に向かって末広がり状をなすと共に，それの吸気道２と反対側の内側面８ａを吸気道２の軸線Ａに略平行させているので，第２金型２２を吸気道２の軸線Ａに沿って後退させれば，第３及び第４凸状部２２ｂ，２２ｃをスロットルボディ１から離型することができる。   The downstream half of the intake passage 2 and the injected fuel guide passage 8 are formed by the third and fourth convex portions 22b and 22c of the second mold 22, respectively, and the throttle body 1 downstream of the intake passage 2 is formed. The end surface is formed by the second mold base 22a. Moreover, the downstream half of the intake passage 2 formed by the third convex portion 22b has a conical shape whose diameter increases toward the upstream end, and the injected fuel guide is formed by the fourth convex portion 22c. Since the path 8 has a divergent shape toward the open surface, and the inner surface 8a opposite to the intake path 2 is substantially parallel to the axis A of the intake path 2, the second mold 22 is connected to the intake path. The second and fourth convex portions 22b and 22c can be released from the throttle body 1 by retreating along the second axis A.

スロットルボディ１の鋳造後，弁収容室７及び噴射燃料誘導路８間の隔壁６に，段付き支持孔９を，その軸線Ｂが吸気道２の軸線Ａと所定の角度θをなすように，切削加工により形成する。   After casting of the throttle body 1, a stepped support hole 9 is formed in the partition wall 6 between the valve housing chamber 7 and the injected fuel guide path 8 so that the axis B thereof forms a predetermined angle θ with the axis A of the intake passage 2. Formed by cutting.

このように，第１金型２１により，吸気道２の上流側半部と弁収容室７との成形を可能にし，また第２金型２２により，吸気道２の下流側半部と噴射燃料誘導路８との成形を可能にしたことで，金型装置を，金型数の少ない簡単なものとして，安価に提供することができる。また金型数を少なくしたことに伴ない製品の多数取りを可能にする金型装置も簡単に構成することができる，製造コストの更なる低減に貢献する。   Thus, the first mold 21 enables the upstream half of the intake passage 2 and the valve accommodating chamber 7 to be molded, and the second mold 22 allows the downstream half of the intake passage 2 and the injected fuel to be injected. Since the molding with the guide path 8 is made possible, the mold apparatus can be provided at a low cost as a simple apparatus having a small number of molds. In addition, a mold apparatus that enables a large number of products to be obtained with a reduced number of molds can be easily configured, which contributes to further reduction in manufacturing costs.

本発明は上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，スロットルボディ１は合成樹脂製とし，上記成形装置を用いて射出成形することもできる。また燃料噴射弁１０付きのスロットルボディ１は，自動二輪車用エンジンに限ることなく，各種用途のエンジンに適用可能である。   The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the throttle body 1 can be made of synthetic resin and can be injection molded using the molding apparatus. The throttle body 1 with the fuel injection valve 10 is not limited to a motorcycle engine, but can be applied to engines for various purposes.

本発明の実施例に係る自動二輪車用エンジンの燃料噴射弁付きスロットルボディの側面図。1 is a side view of a throttle body with a fuel injection valve of a motorcycle engine according to an embodiment of the present invention. 図１の２−２線断面図（但し，スロットルボディのみを示す。）。FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 (however, only the throttle body is shown). スロットルボディの成形用金型装置を一部開き状態で示す縦断側面図。The longitudinal section side view which shows the mold apparatus for molding of a throttle body in a partially opened state. 図３の４−４線断面図。FIG. 4 is a sectional view taken along line 4-4 of FIG.

符号の説明Explanation of symbols

１・・・・スロットルボディ
２・・・・吸気道
４・・・・スロットルバルブ
７・・・・弁収容室
７ａ・・・弁収容室の，吸気道側の内側面
８・・・・噴射燃料誘導路
８ａ・・・噴射燃料誘導路の，吸気道と反対側の内側面
９・・・・支持孔（段付き支持孔）
１０・・・燃料噴射弁
２１・・・一方の金型（第１金型）
２１ｂ・・第１凸状部
２１ｃ・・第２凸状部
２２・・・他方の金型（第１金型）
２１ｂ・・第３凸状部
２１ｃ・・第４凸状部
Ａ・・・・吸気道２の軸線
Ｂ・・・・支持孔９の軸線 DESCRIPTION OF SYMBOLS 1 ... Throttle body 2 ... Intake passage 4 ... Throttle valve 7 ... Valve storage chamber 7a ... Inside surface of valve storage chamber on the intake passage 8 ... Injection Fuel guiding path 8a: Inner side surface of the injected fuel guiding path opposite to the intake path 9 ... Support hole (support hole with step)
10 ... Fuel injection valve 21 ... One mold (first mold)
21b ··· first convex portion 21c ··· second convex portion 22 ... the other mold (first mold)
21b ··· third convex portion 21c · · · fourth convex portion A ··· axis B of intake passage 2 ··· axis of support hole 9

Claims (3)

スロットルバルブ（４）により開閉される吸気道（２）を有するスロットルボディ（１）の一側壁に，前端に支持孔（９）を有する弁収容室（７）を形成し，この弁収容室（７）には，前記支持孔（９）に前端の噴射弁部（１０ａ）を嵌合する燃料噴射弁（１０）を収容し，前記噴射弁部（１０ａ）が吸気道（２）の下流側を指向するように，前記支持孔（９）の軸線（Ｂ）を吸気道（２）の軸線（Ａ）に対して傾けた，燃料噴射弁付きスロットルボディにおいて，
前記弁収容室（７）を，それの吸気道（２）側内側面（７ａ）を吸気道（２）の軸線（Ａ）と略平行させて末広がり状に形成したことを特徴とする，燃料噴射弁付きスロットルボディ。 A valve housing chamber (7) having a support hole (9) at the front end is formed on one side wall of the throttle body (1) having an intake passage (2) opened and closed by the throttle valve (4). 7) houses a fuel injection valve (10) in which the front injection valve portion (10a) is fitted into the support hole (9), and the injection valve portion (10a) is located downstream of the intake passage (2). In the throttle body with a fuel injection valve in which the axis (B) of the support hole (9) is inclined with respect to the axis (A) of the intake passage (2)
The valve housing chamber (7) is formed in a divergent shape with its inner surface (7a) on the intake passage (2) side substantially parallel to the axis (A) of the intake passage (2). Throttle body with injection valve. 請求項１記載の燃料噴射弁付きスロットルボディにおいて，
前記支持孔（９）と吸気道（２）との間に，前記噴射弁部（１０ａ）からの噴射燃料を吸気道（２）に誘導する噴射燃料誘導路（８）をスロットルボディ（１）に設け，この噴射燃料誘導路（８）を，それの吸気道（２）と反対側の内側面（８ａ）を吸気道（２）の軸線（Ａ）と略平行させつゝ末広がり状に形成したことを特徴とする，燃料噴射弁付きスロットルボディ。 The throttle body with a fuel injection valve according to claim 1,
Between the support hole (9) and the intake passage (2), an injected fuel guide path (8) for guiding the injected fuel from the injection valve section (10a) to the intake passage (2) is provided as a throttle body (1). The injection fuel guide path (8) is formed in a widened manner with the inner surface (8a) opposite to the intake passage (2) thereof substantially parallel to the axis (A) of the intake passage (2). A throttle body with a fuel injection valve. 請求項２記載の燃料噴射弁付きスロットルボディにおけるスロットルボディ（１）を成形する金型装置であって，
吸気道（２）の軸線（Ａ）に沿って互いに開閉する一対の金型（２１，２２）を備え，その一方の金型（２１）に吸気道（２）の上流側半部と弁収容室（７）とにそれぞれ対応する第１凸状部（２１ｂ）と第２凸状部（２１ｃ）とを設け，他方の金型（２２）に吸気道（２）の下流側半部と噴射燃料誘導路（８）とにそれぞれ対応する第３凸状部（２２ｂ）と第４凸状部（２２ｃ）とを設けたことを特徴とする，スロットルボディ成形用金型装置。
A mold apparatus for molding a throttle body (1) in a throttle body with a fuel injection valve according to claim 2,
A pair of molds (21, 22) that open and close each other along the axis (A) of the intake passage (2) is provided, and the upstream half of the intake passage (2) and the valve housing are provided in one of the molds (21). A first convex portion (21b) and a second convex portion (21c) respectively corresponding to the chamber (7) are provided, and the downstream half of the intake passage (2) and the jet are injected into the other mold (22). A throttle body molding die device, characterized in that a third convex portion (22b) and a fourth convex portion (22c) respectively corresponding to the fuel guiding path (8) are provided.
JP2003346215A 2003-10-03 2003-10-03 Throttle body with fuel injection valve and die device for molding throttle body Pending JP2005113717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003346215A JP2005113717A (en) 2003-10-03 2003-10-03 Throttle body with fuel injection valve and die device for molding throttle body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003346215A JP2005113717A (en) 2003-10-03 2003-10-03 Throttle body with fuel injection valve and die device for molding throttle body

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125914A1 (en) * 2009-04-27 2010-11-04 株式会社ケーヒン Mold device for molding semi-finished throttle body product

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125914A1 (en) * 2009-04-27 2010-11-04 株式会社ケーヒン Mold device for molding semi-finished throttle body product
JP2010255572A (en) * 2009-04-27 2010-11-11 Keihin Corp Die device for molding throttle body semi-finished product
CN102413965A (en) * 2009-04-27 2012-04-11 株式会社京浜 Mold device for molding semi-finished throttle body product

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