JP4648271B2

JP4648271B2 - Throttle body device having two intake passages and method for manufacturing the same

Info

Publication number: JP4648271B2
Application number: JP2006227275A
Authority: JP
Inventors: 基秋元; 靖史近藤
Original assignee: Keihin Corp
Current assignee: Keihin Corp
Priority date: 2006-08-24
Filing date: 2006-08-24
Publication date: 2011-03-09
Anticipated expiration: 2026-08-24
Also published as: JP2008050983A

Description

本発明は、単一のスロットルボデー内に２個の第１および第２吸気通路が穿設されるとともに、これら第１および第２吸気通路を横断して一本の絞り弁軸がスロットルボデーに回転自在に支持され、この絞り弁軸には、前記第１および第２吸気通路をそれぞれ開閉する第１および第２絞り弁をそれぞれネジ止めする第１ネジ孔および第２ネジ孔が設けられた、２個の吸気通路を備えるスロットルボデー装置に関するもので、かかるスロットルボデー装置により内燃機関に向かう空気量が制御される。 In the present invention, two first and second intake passages are formed in a single throttle body, and one throttle valve shaft is formed in the throttle body across the first and second intake passages. The throttle valve shaft is provided with a first screw hole and a second screw hole for screwing the first and second throttle valves for opening and closing the first and second intake passages, respectively. The present invention relates to a throttle body device having two intake passages, and the amount of air directed to the internal combustion engine is controlled by the throttle body device .

従来のスロットルボデー装置の構造は図６に示される。図６によって説明する。１０は内部を第１吸気通路１１と第２吸気通路１２とが図において上下方向に貫通して穿設されたスロットルボデーであり、それぞれの吸気通路１１、１２の下方は図示されない内燃機関に接続され、その上方は図示されないエアクリーナに接続される。１３は、第１吸気通路１１、第２吸気通路１２を横断し、スロットルボデー１０に貫通して穿設される絞り弁軸受孔であり、スロットルボデー１０の一側壁１０ａから他側壁１０ｂに向けて穿設される。より具体的には、スロットルボデー１０の左側壁１０ａ、スロットルボデー１０の、両吸気通路１１、１２間の中間壁１０ｃおよびスロットルボデー１０の右側壁１０ｂに、同軸線上に並ぶ一側軸受孔１３ａ、中間軸受孔１３ｂおよび他側軸受孔１３ｃがそれぞれ穿設される。前記一側軸受孔、中間軸受孔１３ｂ、他側軸受孔１３ｃは当然に同芯に穿設される。１４は、前記絞り弁軸受孔に回転自在に支持される一本軸よりなる絞り弁軸であり、以下よりなる。１４ａはその一側端（図において左端）に形成される第１軸部であり、１４ｂはその中間部に形成される中間軸部であり、１４ｃはその他側端（図において右端）に形成される第２軸部であり、これら第１軸部１４ａ、中間軸部１４ｂ、第２軸部１４ｃは同芯に形成される。又、中間軸部１４ｂの一端と第１軸部１４ａの他端との間には第１平取り部１４ｄが形成され、中間軸部１４ｂの他端と第２軸部１４ｃの一端との間には第２平取り部１４ｅが形成される。又、この第１平取り部１４ｄには、後述する絞り弁が挿入される第１絞り弁挿入溝１４ｆが平取り部に沿って穿設されるとともに第１平取り部１４ｄ、第１絞り弁挿入溝１４ｆに直交して２個の第１ネジ孔１４ｇ、１４ｇが貫通して穿設される。又、この第２平取り部１４ｅには、後述する絞り弁が挿入される第２絞り弁挿入溝１４ｈが平取り部に沿って穿設されるとともに第２平取り部１４ｅ、第２絞り弁挿入溝１４ｈに直交して２個の第２ネジ孔１４ｊ、１４ｊが貫通して穿設される。更に第２軸部１４ｃの他側端（図において右端）には、後述する駆動レバーを螺着する為、平取り部１４ｋが連設され、この平取り部１４ｋの外周にオネジ１４ｌが形成される。かかる絞り弁軸１４は、機械加工によって切削されるもので、切削加工後において、モリブデン、テフロン（登録商標）等の固体潤滑材Ｋが絞り弁軸１４の外周にコーティング処理されて、絞り弁軸１４に固体潤滑材Ｋが被膜される。 The structure of a conventional throttle body device is shown in FIG. This will be described with reference to FIG. Reference numeral 10 denotes a throttle body in which a first intake passage 11 and a second intake passage 12 are perforated in the vertical direction in the figure, and the lower portions of the intake passages 11 and 12 are connected to an internal combustion engine (not shown). The upper part is connected to an air cleaner (not shown). 13, the first intake passage 11, the second intake passage 12 across a throttle valve bearing hole which is bored through the throttle body 10, the other side wall 10b from the one side wall 10a of the throttle body 10 Drilled toward. More specifically, the left side wall 10a of the throttle body 10, the intermediate wall 10c between the intake passages 11 and 12 of the throttle body 10, and the right side wall 10b of the throttle body 10 have one side bearing holes 13a arranged on the same axis. The intermediate bearing hole 13b and the other-side bearing hole 13c are respectively drilled. The one side shaft receiving bore, an intermediate bearing hole 13b, the other side shaft receiving hole 13c is naturally bored coaxially. Reference numeral 14 denotes a throttle valve shaft comprising a single shaft rotatably supported by the throttle valve bearing hole. 14a is a first shaft portion formed at one end thereof (left end in the drawing), 14b is an intermediate shaft portion formed at an intermediate portion, formed 14c Other end (right end in the drawing) The first shaft portion 14a, the intermediate shaft portion 14b, and the second shaft portion 14c are formed concentrically. A first flattening portion 14d is formed between one end of the intermediate shaft portion 14b and the other end of the first shaft portion 14a, and between the other end of the intermediate shaft portion 14b and one end of the second shaft portion 14c. The second flattening portion 14e is formed in the. The first flattening portion 14d is provided with a first throttle valve insertion groove 14f into which a throttle valve described later is inserted along the flattening portion, and the first flattening portion 14d and the first throttle valve. Two first screw holes 14g and 14g are drilled through perpendicularly to the insertion groove 14f. The second flattening portion 14e is provided with a second throttle valve insertion groove 14h into which a throttle valve to be described later is inserted along the flattening portion, and the second flattening portion 14e and the second throttle valve. Two second screw holes 14j, 14j are drilled through perpendicularly to the insertion groove 14h. Further, the other side end (right end in the drawing) of the second shaft portion 14c is connected with a flattening portion 14k for screwing a drive lever described later, and a male screw 141 is formed on the outer periphery of the flattening portion 14k. The The throttle valve shaft 14 is cut by machining, and after cutting, a solid lubricant K such as molybdenum or Teflon (registered trademark) is coated on the outer periphery of the throttle valve shaft 14 so that the throttle valve shaft 14 is coated. 14 is coated with a solid lubricant K.

そして、絞り弁軸１４は以下によってスロットルボデー１０に組みつけられる。絞り弁軸１４の平取り部１４ｋに、駆動レバー１５に貫通して穿設された平取り孔１５ａが挿入され、この状態においてオネジ１４ｌにナット１６が螺着され、これによって絞り弁軸１４の端部に駆動レバー１５が固定的に取着される。そして、かかる駆動レバー１５を備える絞り弁軸１４がスロットルボデー１０に穿設された絞り弁軸受孔１３内に挿入されるもので、これによると一側軸受孔１３ａに挿入された第１軸部１４ａはベアリング１７ａを介してスロットルボデー１０の一側壁１０ａに回転自在に支持され、中間軸部１４ｂは中間軸受孔１３ｂに回転自在に支持され、第２軸部１４ｃは、ベアリング１７ｂを介してスロットルボデー１０の他側壁１０ｂに回転自在に支持される。又、駆動レバー１５はスロットルボデー１０の他側壁１０ｂより他側方に突出して配置される。ここで、第１ネジ孔１４ｇ、１４ｇを含む第１平取り部１４ｄは、第１吸気通路１１内に臨んで配置されるもので、第１絞り弁挿入溝１４ｆ内に挿入されたバタフライ型の第１絞り弁１８はネジ１９、１９が第１ネジ孔１４ｇ、１４ｇに螺着されることによって第１吸気通路１１内にあって絞り弁軸１４に螺着される。一方、第２ネジ孔１４ｊ、１４ｊを含む第２平取り部１４ｅは第２吸気通路１２内に臨んで配置されるもので、第２絞り弁挿入溝１４ｈ内に挿入されたバタフライ型の第２絞り弁２０は、ネジ１９、１９が第２ネジ孔１４ｊ、１４ｊに螺着されることによって第２吸気通路１２内にあって絞り弁軸１４に螺着される。 The throttle valve shaft 14 is assembled to the throttle body 10 as follows. A flat hole 15a drilled through the drive lever 15 is inserted into the flat portion 14k of the throttle valve shaft 14. In this state, a nut 16 is screwed onto the male screw 14l. The drive lever 15 is fixedly attached to the end. The first axis throttle valve shaft 14 is intended to be inserted into drilled throttle valve bearing hole 13 in the throttle body 10, which is inserted on one side shaft receiving hole 13a according to this with such a drive lever 15 part 14a is rotatably supported on one side wall 10a of the throttle body 10 via a bearing 17a, an intermediate shaft portion 14b is rotatably supported by the intermediate bearing hole 13b, the second shaft portion 14c is a bearing 17b It is rotatably supported on the other side wall 10b of the throttle body 10 Te. The driving lever 15 is arranged to protrude the other side than the other side wall 10b of the throttle body 10. Here, the first chamfered portion 14d including the first screw holes 14g and 14g is disposed facing the first intake passage 11, and is a butterfly type inserted into the first throttle valve insertion groove 14f. The first throttle valve 18 is screwed into the throttle valve shaft 14 in the first intake passage 11 by screws 19 and 19 being screwed into the first screw holes 14g and 14g. On the other hand, the second chamfered portion 14e including the second screw holes 14j and 14j is disposed so as to face the second intake passage 12, and the butterfly-type second inserted into the second throttle valve insertion groove 14h. The throttle valve 20 is screwed to the throttle valve shaft 14 in the second intake passage 12 by screws 19 and 19 being screwed into the second screw holes 14j and 14j.

以上によると、駆動レバー１５がワイヤー又はモーターにより駆動操作されると、絞り弁軸１４は駆動レバー１５と同期的に回転するもので、第１絞り弁１８は駆動レバー１５の回転に応じて第１吸気通路１１を開閉し、第２絞り弁２０は第１絞り弁１８と同期して第２吸気通路１２を開閉する。 According to the above, when the drive lever 15 is driven by a wire or a motor, the throttle valve shaft 14 rotates synchronously with the drive lever 15, and the first throttle valve 18 changes in response to the rotation of the drive lever 15. The first intake passage 11 is opened and closed, and the second throttle valve 20 opens and closes the second intake passage 12 in synchronization with the first throttle valve 18.

かかる従来のスロットルボデーにおける絞り弁軸構造によると、絞り弁軸１４の外周にはその長手軸心線Ｘ−Ｘに沿って連続的に固体潤滑材Ｋがコーティング処理される。これは図７に示される如く絞り弁軸１４の外周に臨んでスプレーノズル２１を配置し、スプレーノズル２１の噴孔より固体潤滑材を噴射しつつ、且つこのスプレーノズル２１を長手軸心線Ｘ−Ｘに沿って往復動させ、もって絞り弁軸１４の外周全体に渡って固体潤滑材Ｋをコーティング処理したものである。上記によれば、固体潤滑材Ｋの使用量が増加するとともにコーティング時間が長くなるもので絞り弁軸の製造コストを効果的に低減できない。又、上記によれば特に絞り弁軸１４に螺設される第１ネジ孔１４ｇ、１４ｇ、第２ネジ孔１４ｊ、１４ｊ、平取り部１４ｋのオネジ１４ｌにも固体潤滑材Ｋがコーティング処理されることになり、これによると第１ネジ孔１４ｇ、１４ｇに対するネジ１９の螺着、第２ネジ孔１４ｊ、１４ｊに対するネジ１９の螺着、平取り部１４ｋのオネジ１４ｌに対するナット１６の螺着を良好に行なうことができない。そして、かかる螺着時の不具合を解消するために、絞り弁軸１４に対する固体潤滑材のコーティング処理の前工程において、前記ネジ孔をマスキング用の治具ネジ２２、２３を用いて螺着して閉塞したり、あるいは第１、第２平取り部１４ｄ、１４ｅ上にマスキング用の平板治具２４、２５を当接配置して前記ネジ孔を閉塞したり、更には平取り部１４ｋのオネジ１４ｌにマスキング用のキャップ治具２６をかぶせたりすることが行なわれる。以上によれば、固体潤滑材Ｋがスプレーノズル２１より噴射されても、ネジ孔１４ｇ、１４ｇ、１４ｊ、１４ｊさらにはオネジ１４ｌに付着することがなくネジ及びナットの螺着を容易に且つ確実に行なうことが可能となる。然しながら上記によれば、かかるマスキング用の治具を用意すること。及びマスキング用の治具の脱着を行なう必要があり、製造コストを低減できない。又、スロットルボデー内に穿設される第１、第２吸気通路の通路間ピッチ等が異なるスロットルボデーに対応する為には、それぞれに適用されるマスキング用の治具を用意する必要がある。 According to the throttle valve shaft structure in such a conventional throttle body, the outer periphery of the throttle valve shaft 14 is continuously coated with the solid lubricant K along the longitudinal axis XX. As shown in FIG. 7, a spray nozzle 21 is arranged facing the outer periphery of the throttle valve shaft 14 and a solid lubricant is injected from the nozzle hole of the spray nozzle 21, and the spray nozzle 21 is moved along the longitudinal axis X. The solid lubricant K is coated over the entire outer periphery of the throttle valve shaft 14 by reciprocating along -X. According to the above, the amount of use of the solid lubricant K increases and the coating time becomes long, so that the manufacturing cost of the throttle valve shaft cannot be reduced effectively. Further, according to the above, the solid lubricant K is also coated on the first screw holes 14g and 14g, the second screw holes 14j and 14j, and the male screw 14l of the flattening portion 14k that are screwed to the throttle valve shaft 14 in particular. According to this, the screw 19 is screwed into the first screw holes 14g and 14g, the screw 19 is screwed into the second screw holes 14j and 14j, and the nut 16 is screwed into the male screw 14l of the flattening portion 14k. Can not be done. And in order to eliminate the trouble at the time of such screwing, the screw hole is screwed using the jig screws 22 and 23 for masking in the pre-process of the solid lubricant coating process on the throttle valve shaft 14. The plate holes 24 and 25 for masking are placed in contact with the first and second flattening portions 14d and 14e to close the screw holes, and the male screw 14l of the flattening portion 14k is closed. A masking jig 26 for masking is placed on the surface. According to the above, even when the solid lubricant K is sprayed from the spray nozzle 21, the screw and nut can be easily and reliably screwed without adhering to the screw holes 14g, 14g, 14j, 14j and the male screw 14l. Can be performed. However, according to the above, such a masking jig should be prepared. In addition, it is necessary to attach and detach the masking jig, and the manufacturing cost cannot be reduced. Further, in order to cope with throttle bodies having different pitches between the first and second intake passages formed in the throttle body, it is necessary to prepare a masking jig to be applied to each.

本発明は、上記不具合に鑑みなされたもので、固体潤滑材がその表面にコーティング処理される絞り弁軸を格別なマスキング用の治具を用いることなく安価に提供することを主たる目的とする。 The present invention has been made in view of the above problems, and has as its main object to provide a throttle valve shaft on which a solid lubricant is coated on its surface at low cost without using a special masking jig.

上記目的を達成するために、本発明は、単一のスロットルボデー内に２個の第１および第２吸気通路が穿設されるとともに、これら第１および第２吸気通路を横断して一本の絞り弁軸がスロットルボデーに回転自在に支持され、この絞り弁軸には、前記第１および第２吸気通路をそれぞれ開閉する第１および第２絞り弁をそれぞれネジ止めする第１ネジ孔および第２ネジ孔が設けられた、２個の吸気通路を備えるスロットルボデー装置において、前記スロットルボデー１０の一側壁、該スロットルボデーの、前記両吸気通路間の中間壁および該スロットルボデーの他側壁に、同軸線上に並ぶ一側軸受孔、中間軸受孔および他側軸受孔をそれぞれ設け、前記一側軸受孔では前記絞り弁軸の第１軸部を、その外周面に固体潤滑材をコーティングすることなく第１ベアリングを介して支持し、前記中間軸受孔では前記絞り弁軸の中間軸部を、その外周面にコーティングした固体潤滑材の膜を介して支持し、前記他側軸受孔では前記絞り弁軸の第２軸部を、その外周面に固体潤滑材をコーティングすることなく第２ベアリングを介して支持し、前記中間軸部の外周面にコーティングされる固体潤滑材の膜の厚さを、該中間軸部の軸方向両側部から軸方向中央部に向かって厚くしたことを第１の特徴とする。 In order to achieve the above object, according to the present invention, two first and second intake passages are formed in a single throttle body, and one is provided across the first and second intake passages. The throttle valve shaft is rotatably supported by the throttle body. The throttle valve shaft has a first screw hole for screwing the first and second throttle valves for opening and closing the first and second intake passages, respectively. In a throttle body device having two intake passages provided with a second screw hole , on one side wall of the throttle body 10, an intermediate wall between the two intake passages of the throttle body, and another side wall of the throttle body A first side bearing hole, an intermediate bearing hole, and a second side bearing hole arranged on a coaxial line are provided, respectively, and the first side bearing hole coats the first shaft portion of the throttle valve shaft and the outer peripheral surface thereof is coated with a solid lubricant. The intermediate bearing hole supports the intermediate shaft portion of the throttle valve shaft through a solid lubricant film coated on the outer peripheral surface thereof, and the other side bearing hole supports the intermediate shaft portion of the throttle valve shaft. The second shaft portion of the throttle valve shaft is supported via a second bearing without coating the outer peripheral surface thereof with a solid lubricant, and the thickness of the solid lubricant film coated on the outer peripheral surface of the intermediate shaft portion The first feature is that the thickness is increased from both axial sides of the intermediate shaft portion toward the central portion in the axial direction .

また本発明は、第１の特徴の２個の吸気通路を備えるスロットルボデー装置を製造するに当たり、前記絞り弁軸の中間軸部の軸方向中央部の外周に臨んでスプレーノズルを固定配置し、前記絞り弁軸をその長手軸心線上において回転するとともにスプレーノズルより前記中間軸部の軸方向中央部に向けて固体潤滑材を傘状に噴射コーティング処理したことを第２の特徴とする。 In the present invention, when manufacturing a throttle body device having two intake passages of the first feature , the spray nozzle is fixedly arranged facing the outer periphery of the axial central portion of the intermediate shaft portion of the throttle valve shaft, a second feature that it has injected coated solid lubricant in an umbrella shape toward the axial center portion of the from the spray nozzle the intermediate shaft unit with rotating the throttle valve shaft in the longitudinal axis line.

本発明の第１の特徴によると、スロットルボデーの一側軸受孔では絞り弁軸の第１軸部が、その外周面に固体潤滑材をコーティングすることなく第１ベアリングを介して支持され、中間軸受孔では絞り弁軸の中間軸部が、その外周面にコーティングした固体潤滑材の膜を介して支持され、他側軸受孔では絞り弁軸の第２軸部が、その外周面に固体潤滑材をコーティングすることなく第２ベアリングを介して支持されるので、絞り弁軸をスロットルボデーに対して良好に回転支持できる。そして、このとき、固体潤滑材は絞り弁軸の中間軸部のみにコーティング処理されるので、固体潤滑材の使用量及びコーティング処理時間を減少させることができ、これによって絞り弁軸の製造コストを効果的に低減できる。又、固体潤滑材は中間軸部にのみコーティング処理されたので、平取り部に螺設される第１、第２ネジ孔に固体潤滑材が付着することがなく、これによると従来の如きネジ孔のマスキング用の治具ネジ、マスキング用の平取り治具を用意する必要がなく、且つマスキング用の治具の取付け、取外し工程を削除できたので、絞り弁軸の製造コストを低減できる。又、マスキング用の治具が不要となったことで、吸気通路等の仕様違いに対し、極めて容易に対応を図ることができる。 According to the first feature of the present invention, in the one-side bearing hole of the throttle body, the first shaft portion of the throttle valve shaft is supported via the first bearing without coating the outer peripheral surface of the solid lubricant, In the bearing hole, the intermediate shaft portion of the throttle valve shaft is supported via a solid lubricant film coated on the outer peripheral surface, and in the other bearing hole, the second shaft portion of the throttle valve shaft is solid lubricated on the outer peripheral surface. Since it is supported through the second bearing without coating the material , the throttle valve shaft can be favorably rotated with respect to the throttle body. At this time, since the solid lubricant is coated only on the intermediate shaft portion of the throttle valve shaft, the amount of solid lubricant used and the coating processing time can be reduced, thereby reducing the manufacturing cost of the throttle valve shaft. It can be effectively reduced. Further, since the solid lubricant is coated only on the intermediate shaft portion, the solid lubricant does not adhere to the first and second screw holes screwed to the flattening portion. Since it is not necessary to prepare a jig screw for masking a hole and a flattening jig for masking, and the process for attaching and removing the masking jig can be eliminated, the manufacturing cost of the throttle valve shaft can be reduced. Further, since the masking jig is not required, it is possible to cope with the difference in specifications such as the intake passage very easily.

又、中間軸部にコーティング処理される固体潤滑材の膜の厚さを、中間軸部の軸方向両側部から軸方向中央部に向かって厚くしたので、中間軸部の軸方向中央部における固体潤滑材の膜の厚肉部が中間軸受孔に接触する。以上によると、絞り弁の中間軸部における中間軸受孔との摺動抵抗を減少させることができ、絞り弁軸の操作性を向上できる。特に絞り弁より下流側の吸気通路に生起する負圧が大となる機関の急減速運転時及び機関のアイドリング運転時における絞り弁の開方向制御を容易に行なうことができる。 In addition , since the thickness of the solid lubricant film coated on the intermediate shaft portion is increased from the both axial sides of the intermediate shaft portion toward the central portion in the axial direction, the solid in the axial central portion of the intermediate shaft portion is increased. The thick part of the lubricant film contacts the intermediate bearing hole. According to the above, the sliding resistance with the intermediate bearing hole in the intermediate shaft portion of the throttle valve can be reduced, and the operability of the throttle valve shaft can be improved. In particular, it is possible to easily control the opening direction of the throttle valve during the sudden deceleration operation of the engine in which the negative pressure generated in the intake passage on the downstream side of the throttle valve becomes large and during the idling operation of the engine.

更に本発明の第２の特徴によると、絞り弁軸の中間軸部の中心の外周にスプレーノズルが固定配置され、このスプレーノズルから傘状の固体潤滑材が中間軸部の外周に向けて噴射されるので、この傘形状、固体潤滑材の噴射圧力等を適正に設定することにより、平取り部に穿設されるネジ孔にマスキング用の治具を用いることなく、固体潤滑材が付着することがないもので、中間軸部にのみ固体潤滑材をコーティング処理できる。又、上記によれば、スプレーノズルから噴射される傘状の固体潤滑材はその中心部の固体潤滑材密度が高く、傘の外周部分で固体潤滑材の密度が希薄となるので、中間軸部の外周面にコーティングされる固体潤滑材の膜の厚さを、中間軸部の軸方向両側部から軸方向中央部に向かって厚くすることができる。 Further, according to the second feature of the present invention, a spray nozzle is fixedly arranged on the outer periphery of the center of the intermediate shaft portion of the throttle valve shaft, and umbrella-shaped solid lubricant is injected from the spray nozzle toward the outer periphery of the intermediate shaft portion. Therefore, by properly setting the umbrella shape, the injection pressure of the solid lubricant, etc., the solid lubricant adheres to the screw hole drilled in the flattening portion without using a masking jig. The solid lubricant can be coated only on the intermediate shaft portion. Further, according to the above, since the umbrella-shaped solid lubricant sprayed from the spray nozzle has a high solid lubricant density at the center, and the density of the solid lubricant is thin at the outer peripheral portion of the umbrella, the intermediate shaft portion The thickness of the solid lubricant film coated on the outer peripheral surface of the intermediate shaft portion can be increased from the axially opposite side portions of the intermediate shaft portion toward the axially central portion .

以下、本発明になる２個の吸気通路を備えるスロットルボデーにおける絞り弁軸構造の一実施例を図１により説明する。図１はその要部縦断面図である。尚、図６と同一構造部分は同一符号を使用して説明を省略し、異なる部分についてのみ説明する。絞り弁軸１４には、その中間軸部１４ｂの外周にのみ固体潤滑材Ｋがコーティング処理され、他の部位に固体潤滑材Ｋはコーティング処理されない。これは図２に示される如く、中間軸部１４ｂの長手軸心線Ｘ−Ｘに沿う中央部Ａ−Ａにスプレーノズル２１を配置し、スプレーノズル２１を固定した状態において、その先端の噴孔から霧状の固体潤滑材Ｋを傘状に噴射するとともに絞り弁軸１４をその長手軸心線Ｘ−Ｘを基準として回転することによって中間軸部１４ｂの外周にのみに固体潤滑材Ｋがコーティング処理される。そして、かかるコーティング処理において、第１ネジ孔１４ｇ、１４ｇ、第２ネジ孔１４ｊ、１４ｊ、さらには平取り部１４ｋのオネジ１４ｌに固体潤滑材Ｋがコーティング処理されることがないもので、図２に示される固体潤滑材Ｋの噴射角度Ｙあるいは噴射圧力を適宜選択することによって達成される。例えば、傘状に噴射された外周部分を中間軸部１４ｂの外側部１４ｂ１、１４ｂ２に摺向すればよい。そして、上記によって形成された絞り弁軸１４がスロットルボデー１０に回転自在に支承配置されるもので、絞り弁軸１４の一側軸受孔１３ａに挿入される第１軸部１４ａは、第１ベアリング１７ａを介してスロットルボデー１０の一側壁１０ａに回転自在に支承され、絞り弁軸１４の他側軸受孔１３ｃに挿入される第２軸部１４ｃは、第２ベアリング１７ｂを介してスロットルボデー１０の他側壁１０ｂに回転自在に支承され、又その外周に固体潤滑材Ｋがコーティング処理された中間軸部１４ｂはスロットルボデー１０の中間軸受孔１３ｂに回転自在に支承される。以上の如く、絞り弁軸の両端部がベアリング１３ａ、１３ｂを介してスロットルボデー１０に回転自在に支承され、その中間部が固体潤滑材Ｋを介してスロットルボデー１０に回転自在に支承されるので絞り弁軸１４はスロットルボデー１０に対して円滑に回転自在に支持される。又、絞り弁軸１４の第１ネジ孔１４ｇ、１４ｇ及び第２ネジ孔１４ｊ、１４ｊに固体潤滑材Ｋがコーティング処理されないので、第１ネジ孔１４ｇ、１４ｇにネジ１９、１９を極めて容易に螺着することができて、第１絞り弁１８を容易に第１絞り弁挿入溝１４ｆに挿入して螺着固定できる。同様に第２ネジ孔１４ｊ、１４ｊにネジ１９、１９を極めて容易に螺着することができて、第２絞り弁２０を容易に第２絞り弁挿入溝１４ｈに挿入して螺着できる。又、同様に固体潤滑材Ｋがコーティング処理されない平取り部１４ｋのオネジ１４ｌにナット１６を容易に螺着することができて駆動レバー１５を第２軸部１４ｃの端部に螺着固定できる。 An embodiment of a throttle valve shaft structure in a throttle body having two intake passages according to the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view of an essential part thereof. 6 that are the same as those in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted. The throttle valve shaft 14 is coated with the solid lubricant K only on the outer periphery of the intermediate shaft portion 14b, and the solid lubricant K is not coated on other portions. As shown in FIG. 2, the spray nozzle 21 is disposed in the central portion AA along the longitudinal axis XX of the intermediate shaft portion 14b, and the nozzle hole at the tip of the spray nozzle 21 is fixed. The solid lubricant K is coated only on the outer periphery of the intermediate shaft portion 14b by injecting the mist-like solid lubricant K in the shape of an umbrella and rotating the throttle valve shaft 14 with respect to the longitudinal axis XX. It is processed. In this coating process, the first screw holes 14g and 14g, the second screw holes 14j and 14j, and the male screw 14l of the flattening portion 14k are not coated with the solid lubricant K. FIG. This is achieved by appropriately selecting the injection angle Y or the injection pressure of the solid lubricant K shown in FIG. For example, the outer peripheral portion injected in an umbrella shape may be slid toward the outer portions 14b1 and 14b2 of the intermediate shaft portion 14b. Then, those throttle valve shaft 14 formed by the above is rotatably supported disposed throttle body 10, the first shaft portion 14a to be inserted into one side shaft receiving hole 13a of the throttle valve shaft 14, first rotatably is supported on one side wall 10a of the throttle body 10 via a bearing 17a, the second shaft portion 14c to be inserted into the other side shaft receiving hole 13c of the throttle valve shaft 14, the throttle through a second bearing 17b is rotatably supported on the other side wall 10b of the body 10, and an intermediate shaft portion 14b solid lubricant K is coated on the outer periphery thereof is rotatably supported by the intermediate bearing hole 13b of the throttle body 10. As described above, both end portions of the throttle valve shaft are rotatably supported on the throttle body 10 via the bearings 13a and 13b, and intermediate portions thereof are rotatably supported on the throttle body 10 via the solid lubricant K. The throttle valve shaft 14 is supported smoothly and freely rotatable with respect to the throttle body 10. Further, since the solid lubricant K is not coated on the first screw holes 14g, 14g and the second screw holes 14j, 14j of the throttle valve shaft 14, the screws 19, 19 are screwed into the first screw holes 14g, 14g very easily. The first throttle valve 18 can be easily inserted into the first throttle valve insertion groove 14f and fixed by screwing. Similarly, the screws 19, 19 can be screwed into the second screw holes 14j, 14j very easily, and the second throttle valve 20 can be easily inserted into the second throttle valve insertion groove 14h and screwed. Similarly, the nut 16 can be easily screwed to the male screw 14l of the flattening portion 14k not coated with the solid lubricant K, and the drive lever 15 can be screwed and fixed to the end of the second shaft portion 14c.

以上の如く、本発明によれば、絞り弁軸１４には、その中間軸部１４ｂにのみ固体潤滑材Ｋがコーティング処理されたので、従来の絞り弁軸に比較して固体潤滑材Ｋの使用量を減少することができるとともにコーティング処理時間を減少できたので、絞り弁軸の製造コストを低減できたものである。又、中間軸部１４ｂのコーティング処理時に、マスキング用の治具を用いることなく、第１ネジ孔１４ｇ、１４ｇ、第２ネジ孔１４ｊ、１４ｊ、オネジ１４ｌに固体潤滑材Ｋがコーティング処理されないので、マスキング用の治具の取付け、取外しが不要となり、コーティング処理時間を短縮することができ、更には第１吸気通路１１と第２吸気通路１２の通路ピッチが変更に成った際、等のスロットルボデーの仕様変更時にあってもマスキング用の治具を変更したりする必要がない。 As described above, according to the present invention, the throttle valve shaft 14 is coated with the solid lubricant K only on the intermediate shaft portion 14b, so that the solid lubricant K is used in comparison with the conventional throttle valve shaft. Since the amount could be reduced and the coating processing time could be reduced, the manufacturing cost of the throttle valve shaft could be reduced. In addition, the solid lubricant K is not coated on the first screw holes 14g, 14g, the second screw holes 14j, 14j, and the male screw 14l without using a masking jig during the coating process of the intermediate shaft portion 14b. It is not necessary to attach or remove a masking jig, the coating processing time can be shortened, and when the passage pitch of the first intake passage 11 and the second intake passage 12 is changed, a throttle body such as There is no need to change the masking jig even when the specifications are changed.

又、図３に示される如く、スプレーノズル２１を、中間軸部１４ｂの軸方向中央部Ａ−Ａに対向して固定配置し、このスプレーノズル２１より固体潤滑材Ｋを傘状に噴射すると、中間軸部１４ｂの軸方向中央部Ａ−Ａの外周に、固体潤滑材Ｋの膜の厚さｔ１を形成でき、中間軸部１４ｂの外側部１４ｂ１、１４ｂ２に固体潤滑材Ｋの膜の厚さｔ２を形成でき、このときスプレーノズル２１から噴射される傘状の固体潤滑材Ｋは、その中心部における固体潤滑材Ｋの密度が傘状の外周部における固体潤滑材Ｋの密度より濃いことから、中間軸部１４ｂの外周面にコーティングされる固体潤滑材Ｋの膜の厚さを、中間軸部の軸方向両側部から軸方向中央部に向かって厚くすることができる。即ち、中間軸部１４ｂの軸方向中央部Ａ−Ａにおける前記固体潤滑材Ｋの膜の厚さｔ１を外側部１４ｂ１、１４ｂ２の固体潤滑材Ｋの膜の厚さｔ２より厚く形成することができる。 Further, as shown in FIG. 3, when the spray nozzle 21 is fixedly disposed facing the axial center AA of the intermediate shaft portion 14 b and the solid lubricant K is sprayed from the spray nozzle 21 in an umbrella shape, the outer periphery of the axially central portion a-a of the intermediate shaft portion 14b, can form a thickness t1 of the film of the solid lubricant K, the thickness of the film of the solid lubricant K on the outer portion 14b1,14b2 of the intermediate shaft portion 14b t2 can be formed, and the umbrella-shaped solid lubricant K sprayed from the spray nozzle 21 at this time has a density of the solid lubricant K at the center thereof higher than that of the solid lubricant K at the outer periphery of the umbrella. The thickness of the film of the solid lubricant K coated on the outer peripheral surface of the intermediate shaft portion 14b can be increased from the both axial sides of the intermediate shaft portion toward the central portion in the axial direction . That is, the thickness t1 of the solid lubricant K film at the axial center AA of the intermediate shaft portion 14b can be made thicker than the thickness t2 of the solid lubricant K film at the outer portions 14b1 and 14b2. .

以上の如く、中間軸部１４ｂの外周に固体潤滑材Ｋがコーティング処理されたことによると、図４に示される如く中間軸受孔１３ｂ内に挿入配置される中間軸部１４ｂは、その軸方向中央部Ａ−Ａにおいてもっとも突出する固体潤滑材Ｋが中間軸受孔１３ｂに部分的に当接するもので、これによって中間軸部１４ｂと中間軸受孔１３ｂの摺動抵抗を減少できる。これは絞り弁より下流側の吸気通路に大なる負圧が生起する機関のアイドリング運転時あるいは機関の急減速運転時において、絞り弁軸は中間軸受孔１３ｂの一側（図４において下側）に強く押圧される際、絞り弁軸の開放操作力を低減する上で効果的である。尚、図５に示されたものは、図Ａに示される従来の中間軸部１４ｂと中間軸受孔１３ｂと、１０の関係が示されるもので、これによると中間軸部１４ｂにはほぼ均一の固定潤滑材Ｋがコーティング処理され、中間軸部１４ｂの長手軸心線に沿う全周域が中間軸受孔１３ｂに当接され、以上によると、中間軸部１４ｂと中間軸受孔１３ｂとの摺動抵抗をより効果的に低減できない。又、本実施はスロットルボデーに配置される絞り弁軸に適用したものであるが、機関へ供給する混合気の量及び混合気濃度を制御する気化器における絞り弁軸にも適用できる。 As mentioned above, according to the outer peripheral solid lubricant K of the intermediate shaft portion 14b is coated, an intermediate shaft portion 14b which is inserted in the intermediate bearing hole 13b as shown in FIG. 4, the axial center The solid lubricant K that protrudes most in the portion A-A partially abuts on the intermediate bearing hole 13b, thereby reducing the sliding resistance between the intermediate shaft portion 14b and the intermediate bearing hole 13b. This is because the throttle valve shaft is on one side of the intermediate bearing hole 13b (lower side in FIG. 4) during idling operation of the engine in which a large negative pressure is generated in the intake passage downstream of the throttle valve or during rapid deceleration operation of the engine. This is effective in reducing the opening operation force of the throttle valve shaft when it is strongly pressed. 5 shows the relationship between the conventional intermediate shaft portion 14b and the intermediate bearing hole 13b shown in FIG. A and 10, and according to this, the intermediate shaft portion 14b has a substantially uniform relationship. The fixed lubricant K is coated, and the entire circumferential area along the longitudinal axis of the intermediate shaft portion 14b is brought into contact with the intermediate bearing hole 13b. According to the above, the sliding between the intermediate shaft portion 14b and the intermediate bearing hole 13b is performed. Resistance cannot be reduced more effectively. Although this embodiment is applied to the throttle valve shaft disposed in the throttle body, it can also be applied to a throttle valve shaft in a carburetor for controlling the amount of air-fuel mixture supplied to the engine and the air-fuel mixture concentration.

本発明になる２個の吸気通路を備えるスロットルボデーにおける絞り弁軸構造の一実施例を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows one Example of the throttle valve shaft structure in a throttle body provided with the two intake passages which become this invention. 図１に用いられる絞り弁軸に対して噴射ノズルより固体潤滑材が噴射される状態を示す絞り弁軸の外側面図。The outer side view of a throttle valve axis | shaft which shows the state in which a solid lubricant is injected from an injection nozzle with respect to the throttle valve axis | shaft used for FIG. 本発明になる絞り弁軸の製造方法の一例を示す要部外側面図。The principal part outer side view which shows an example of the manufacturing method of the throttle valve axis | shaft which becomes this invention. 本発明になる絞り弁軸の中間軸部の中間軸受孔への挿入状態を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the insertion state to the intermediate bearing hole of the intermediate shaft part of the throttle valve shaft which becomes this invention. 従来の絞り弁軸の中間軸部の中間軸受孔への挿入状態を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the insertion state to the intermediate bearing hole of the intermediate shaft part of the conventional throttle valve shaft. 従来の絞り弁軸受構造を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the conventional throttle valve bearing structure. 従来の絞り弁軸の製造方法を示す要部外側面図。The principal part outer side view which shows the manufacturing method of the conventional throttle valve axis | shaft.

１０スロットルボデー
１０ａ一側壁
１０ｂ他側壁
１０ｃ中間壁
１１第１吸気通路
１２第２吸気通路
１３絞り弁軸受孔
１３ａ一側軸受孔
１３ｂ中間軸受孔
１３ｃ他側軸受孔
１４絞り弁軸
１４ａ第１軸部
１４ｂ中間軸部
１４ｃ第２軸部
Ｋ固体潤滑材 10 throttle body 10a one side wall 10b the other side wall
10c intermediate wall 11 the first intake passage 12 and the second intake passage 13 throttle valve bearing hole 13a on one side shaft receiving hole 13b intermediate bearing hole 13c other side shaft receiving hole 14 throttle valve shaft 14a first shaft portion 14b intermediate shaft portion 14c second Shaft K Solid lubricant

Claims

単一のスロットルボデー（１０）内に２個の第１および第２吸気通路（１１、１２）が穿設されるとともにこれら第１および第２吸気通路（１１、１２）を横断して一本の絞り弁軸（１４）がスロットルボデー（１０）に回転自在に支持され、この絞り弁軸（１４）には、前記第１および第２吸気通路（１１、１２）をそれぞれ開閉する第１および第２絞り弁（１８、２０）をそれぞれネジ止めする第１ネジ孔（１４ｇ）および第２ネジ孔（１４ｊ）が設けられた、２個の吸気通路を備えるスロットルボデー装置において、
前記スロットルボデー（１０）の一側壁（１０ａ）、該スロットルボデー（１０）の、前記両吸気通路（１１、１２）間の中間壁（１０ｃ）および該スロットルボデー（１０）の他側壁（１０ｂ）に、同軸線上に並ぶ一側軸受孔（１３ａ）、中間軸受孔（１３ｂ）および他側軸受孔（１３ｃ）をそれぞれ設け、前記一側軸受孔（１３ａ）では前記絞り弁軸（１４）の第１軸部（１４ａ）を、その外周面に固体潤滑材（Ｋ）をコーティングすることなく第１ベアリング（１７ａ）を介して支持し、前記中間軸受孔（１３ｂ）では前記絞り弁軸（１４）の中間軸部（１４ｂ）を、その外周面にコーティングした固体潤滑材（Ｋ）の膜を介して支持し、前記他側軸受孔（１３ｃ）では前記絞り弁軸（１４）の第２軸部（１４ｃ）を、その外周面に固体潤滑材（Ｋ）をコーティングすることなく第２ベアリング（１７ｂ）を介して支持し、前記中間軸部（１４ｂ）の外周面にコーティングされる固体潤滑材（Ｋ）の膜の厚さを、該中間軸部（１４ｂ）の軸方向両側部から軸方向中央部（Ａ−Ａ）に向かって厚くしたことを特徴とする、２個の吸気通路を備えるスロットルボデー装置。 Two first and second intake passages (11, 12) are formed in a single throttle body (10), and one is provided across the first and second intake passages (11, 12). The throttle valve shaft (14) is rotatably supported by the throttle body (10), and the throttle valve shaft (14) has first and second intake passages (11, 12) for opening and closing, respectively. In a throttle body device having two intake passages provided with a first screw hole (14g) and a second screw hole (14j) for screwing the second throttle valve (18, 20), respectively .
One side wall (10a) of the throttle body (10), an intermediate wall (10c) between the intake passages (11, 12) of the throttle body (10), and another side wall (10b) of the throttle body (10) Are provided with a one side bearing hole (13a), an intermediate bearing hole (13b) and another side bearing hole (13c) arranged on the same coaxial line. The one shaft portion (14a) is supported via the first bearing (17a) without coating the outer peripheral surface thereof with the solid lubricant (K), and the throttle valve shaft (14) is provided in the intermediate bearing hole (13b). The intermediate shaft portion (14b) is supported through a film of solid lubricant (K) coated on the outer peripheral surface thereof , and the second shaft portion of the throttle valve shaft (14) is provided in the other side bearing hole (13c). (14c) The thickness of the film of the solid lubricant (K) supported by the second bearing (17b) without coating the lubricant (K) and coated on the outer peripheral surface of the intermediate shaft portion (14b) is A throttle body device having two intake passages , characterized by being thickened from both axial sides of the intermediate shaft portion (14b) toward the axial center portion (AA) .

前記絞り弁軸（１４）の中間軸部（１４ｂ）の軸方向中央部（Ａ−Ａ）の外周に臨んでスプレーノズル（２１）を固定配置し、前記絞り弁軸（１４）をその長手軸心線（Ｘ−Ｘ）上において回転するとともにスプレーノズル（２１）より前記中間軸部（１４ｂ）の軸方向中央部（Ａ−Ａ）に向けて固体潤滑材（Ｋ）を傘状に噴射コーティング処理したことを特徴とする、請求項１記載の２個の吸気通路を備えるスロットルボデー装置の製造方法。 Axial central portion of the intermediate shaft portion (14b) of the spray nozzle faces in (A-A) the outer periphery (21) fixedly arranged in the throttle valve shaft (14), the longitudinal axis of the throttle valve shaft (14) core wire (X-X) injection axially central portion of the intermediate shaft portion than the spray nozzle (21) with rotation (14b) and (a-a) in toward the solid lubricant (K) in an umbrella-like on the coating The method of manufacturing a throttle body device having two intake passages according to claim 1, wherein the throttle body device is processed.