WO2010082446A1 - Device for controlling amount of bypassed intake air - Google Patents

Device for controlling amount of bypassed intake air Download PDF

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Publication number
WO2010082446A1
WO2010082446A1 PCT/JP2009/071772 JP2009071772W WO2010082446A1 WO 2010082446 A1 WO2010082446 A1 WO 2010082446A1 JP 2009071772 W JP2009071772 W JP 2009071772W WO 2010082446 A1 WO2010082446 A1 WO 2010082446A1
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WO
WIPO (PCT)
Prior art keywords
bypass
valve
hole
intake air
bypass valve
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PCT/JP2009/071772
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French (fr)
Japanese (ja)
Inventor
秋山　裕茂
崇 後藤
Original Assignee
株式会社ケーヒン
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Publication date
Application filed by 株式会社ケーヒン filed Critical 株式会社ケーヒン
Priority to CN2009801542762A priority Critical patent/CN102272440A/en
Priority to BRPI0923943A priority patent/BRPI0923943A2/en
Publication of WO2010082446A1 publication Critical patent/WO2010082446A1/en

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    • 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
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/006—Valves specially shaped for supplying secondary air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • a throttle body having an intake passage that is opened and closed by a throttle valve is provided with a bypass that bypasses the throttle valve and is connected to the intake passage, and a cylindrical valve hole that intervenes in the bypass.
  • the piston-type bypass valve that opens and closes the bypass by axial movement is fitted slidably and non-rotatably, and the bypass valve and the output shaft of the actuator attached to the throttle body are connected via a screw mechanism.
  • the present invention relates to an improvement of a bypass intake air amount control device that is connected to open and close a bypass valve in the axial direction by rotation of an output shaft.
  • an object of the present invention is to provide a bypass intake air amount control device that can ensure a smooth operation of the screw mechanism.
  • the present invention provides a throttle body having an intake passage that is opened and closed by a throttle valve, a bypass that bypasses the throttle valve and is connected to the intake passage, and a cylindrical valve that intervenes in the bypass.
  • a piston-like bypass valve that opens and closes the bypass by axial movement is fitted into the valve hole in a slidable and non-rotatable manner.
  • the output of the bypass valve and the actuator attached to the throttle body In the bypass intake air amount control device, wherein the bypass valve is driven to open and close in the axial direction by rotating the output shaft by connecting the shaft to the shaft, dust that extends in the circumferential direction on the outer peripheral surface of the bypass valve
  • a first feature is that a concave groove for trapping is provided.
  • the inner surface of the valve hole is provided with a measuring hole that is connected to the downstream side of the bypass and is opened and closed by the axial movement of the bypass valve.
  • a second feature is that the concave groove on the outer peripheral surface of the valve is formed in an arc shape so that an end thereof ends in front of the measuring hole.
  • valve hole has a metering hole that is connected to the downstream side of the bypass and is opened and closed by axial movement of the bypass valve.
  • a third feature of the present invention is that the concave groove is annularly provided on the outer peripheral surface of the valve on the actuator side from the metering hole.
  • the screw mechanism includes a screw shaft connected to the output shaft and a drive member having a screw hole screwed to the screw shaft.
  • a fourth feature is that an Oldham joint for connecting the drive member to the bypass valve is disposed in a thick portion of the peripheral wall of the bypass valve, and the concave groove is formed in the outer periphery of the thick portion.
  • bypass valve is arranged so that its axis is directed in the vertical direction when the throttle body is in use, and the concave groove has an inlet hole side of the valve hole.
  • a fifth feature is that the lower side surface is formed of a slope inclined toward the inlet hole side, and the upper side surface opposite to the lower side surface is formed of a flat surface.
  • dust flows into the valve hole from the upstream side of the bypass together with the intake air, and rises in the valve hole and tries to pass through the sliding gap between the valve hole and the bypass valve to the actuator side.
  • the bypass valve has a concave groove for dust trap on its outer periphery, the dust can be captured by the concave groove and the passage of the dust to the sliding gap can be prevented. Therefore, the dust can be prevented from adhering and accumulating on the screw mechanism, and the smoothness of the operation of the screw mechanism can be ensured.
  • the dust can be immediately captured by the concave groove.
  • the groove and the measuring hole are disconnected from each other, so that the groove interferes with the measuring function of the measuring hole. You can avoid that.
  • the bypass valve is usually the inner surface of the valve hole where the metering hole opens due to negative intake air pressure of the engine acting downstream of the bypass. Therefore, the metering hole is in close contact with the inner surface of the valve hole, and its sliding gap becomes zero, preventing the dust from moving to the screw mechanism side.
  • the dust trapping function of the groove can be enhanced over the entire periphery of the bypass valve.
  • the concave groove is formed deeper in the thick part where the joint member of the bypass valve is fitted than in the thickness of the other thin part, and thus the concave groove is free from dust in the concave groove.
  • it is possible to reduce the waste meat from the bypass valve as much as possible, to reduce its weight and to improve responsiveness.
  • the fifth aspect of the present invention it is possible to prevent the dust trapped in the concave groove from escaping from the concave groove to the upper actuator side as much as possible by the flat surface, and to prevent the dust from escaping below the bypass valve. Can be promoted by slope.
  • FIG. 1 is a longitudinal sectional view showing a bypass intake air amount control apparatus according to a first embodiment of the present invention in a fully closed state of a bypass valve.
  • FIG. 2 is a longitudinal sectional view showing the apparatus with the bypass valve fully opened.
  • First embodiment 3 is a cross-sectional view taken along line 3-3 of FIG.
  • First embodiment 4 is a cross-sectional view taken along line 4-4 of FIG.
  • FIG. 5 is a perspective view of a bypass valve in the apparatus.
  • FIG. 6 is a diagram corresponding to FIG. 2, showing a second embodiment of the present invention.
  • (Second embodiment) 7 is a cross-sectional view taken along line 7-7 of FIG. (Second embodiment)
  • the bypass intake air amount control device A of the present invention has a throttle body 1 attached to a cylinder head (not shown) of the engine.
  • the throttle body 1 is composed of a main body 1a having an intake passage 2 connected to an intake port of the engine and a sub body 1b bolted to one side of the main body 1a.
  • the main body 1a includes an intake passage 2 A butterfly throttle valve 3 that opens and closes is pivotally supported, and a bypass 4 that bypasses the throttle valve 3 and is connected to the intake passage 2 is formed from the main body 1a to the sub body 1b.
  • the sub-body 1b is formed with a bottomed cylindrical valve hole 5 that divides the bypass 4 into an upstream passage 4a that communicates with the upstream side of the intake passage 2 and a downstream passage 4b that communicates with the downstream side of the intake passage 2. .
  • the downstream end of the upstream passage 4a opens as an inlet hole 5a of the valve hole 5 on the bottom surface of the valve hole 5, and the upstream end of the downstream passage 4b opens as a measuring hole 5b on one side of the valve hole 5.
  • O-rings 7 and 8 surrounding the upstream passage 4a and the downstream passage 4b penetrating the joint surfaces are interposed.
  • a piston-like bypass valve 10 that opens and closes between the inlet hole 5a and the measuring hole 5b is slidably fitted.
  • a rotation preventing means 11 for preventing the bypass valve 10 from rotating is provided.
  • the anti-rotation means 11 is formed on one side of the bypass valve 10 on the side opposite to the measuring hole 5b and extends in the axis Y direction of the bypass valve 10 and slidably engages with the key groove 12.
  • the key 13 is screwed into the sub-body 1b, and the end of the key groove 12 on the electric motor 17 side is closed by a partition wall 14 that is integrally continuous with the outer peripheral surface of the bypass valve 10.
  • the other side surface of the bypass valve 10 is provided with a measurement notch 15 that opens toward the inlet hole 5a, and the degree of communication between the notch 15 and the measurement hole 5b is adjusted from zero to the maximum.
  • the bypass valve 10 can move in the axial direction from the fully closed position of FIG. 1 to the fully open position of FIG.
  • the sub-body 1b is provided with an attachment hole 16 that is coaxially connected to the end of the valve hole 5 opposite to the inlet hole 5a via an annular shoulder 16a, and an electric motor 17 is attached to the attachment hole 16.
  • the bypass valve 10 is connected to the output shaft 18 of the electric motor 17 through a screw mechanism 19 and an Oldham joint 20 in order.
  • the bypass valve 10 is provided with a bottomed hollow portion 21 that opens to the electric motor 17 side.
  • the screw mechanism 19 is accommodated in the hollow portion 21, and the Oldham joint 20 is provided on the bottom wall 21 a of the hollow portion 21. It is done.
  • the screw mechanism 19 includes a screw shaft 18a integrally connected to the output shaft 18 of the electric motor 17, and a drive member 22 having a screw hole 22a into which the screw shaft 18a is screwed.
  • the Oldham joint 20 includes a first square hole 24 provided in the bottom wall 21a of the bottomed hollow portion 21 of the bypass valve 10, and a first square hole 24.
  • a joint member 26 fitted so as to be slidable in the lateral direction X1, and the drive member 22 provided in the joint member 26 in the second lateral direction X2 perpendicular to the first lateral direction X1. It is comprised with the 2nd square hole 25 fitted so that sliding is possible.
  • the drive member 22 is formed relatively long so as to penetrate the joint member 26 and the bottom wall 21a, and the screw hole 22a penetrates the drive member 22 in the axial direction.
  • a flange 22 b that abuts against the outer end surface of the joint member 26 is formed at the intermediate portion of the drive member 22.
  • a set pin 27 is fitted on the outer end of the drive member 22 projecting out of the bottom wall 21 a so as to cross the drive member 22, and a conical coil-shaped set between the set pin 27 and the bypass valve 10.
  • the spring 28 is contracted, and the set spring 28 presses the flange 22b of the drive member 22 against the outer end surface of the joint member 26 by the compression repulsive force, thereby holding the joint member 26 in contact with the bottom wall 21a.
  • a stopper pin 30 positioned on the inner side in the axial direction from the set pin 27 is mounted on the drive member 22 so as to cross the drive member 22.
  • the stopper pin 30 receives the tip of the screw shaft 18a and regulates the fully open side movement limit of the bypass valve 10.
  • the two pins 27 and 30 are both spring pins, and are held by elastically contacting the inner peripheral surfaces of the mounting holes 32 and 33 of the respective drive members 22.
  • the outer circumferential surface of the bypass valve 10 is provided with a U-shaped or U-shaped concave groove 34 for dust traps extending in the circumferential direction.
  • the portion 10b where the joint member 26 of the bypass valve 10 is fitted is a thick portion 10b that is thicker than the other thin portions 10a.
  • the metering hole 5b is arranged in the vicinity of the notch 15 of the bypass valve 10 so as to be approximately within the vertical width region along the axis Y direction of the bypass valve 10.
  • a pair of concave grooves 34 are formed on the outer periphery of the thick portion 10b in a circular arc shape so as to be deeper than the thickness of the thin portion 10a and end at both ends before the measuring hole 5b and the key groove 12. Since the upper end of the key groove 12 is closed, there is no problem even if the concave groove 34 is communicated with the key groove 12.
  • the bypass valve 10 is arranged so that its axis Y is directed in the vertical direction, and the lower side surface of the concave groove 34 on the inlet hole 5a side is a slope 34b inclined to the inlet hole 5a side.
  • the upper surface on the opposite side is formed on a flat surface 34a that is orthogonal to the axis Y of the bypass valve 10.
  • a dust cover 35 that surrounds the screw mechanism 19 in the bottomed hollow portion 21 of the bypass valve 10 is attached to the sub-body 1b, particularly when the bypass valve 10 occupies the fully open position or a position in the vicinity thereof.
  • the dust cover 35 includes a cylindrical portion 35a that coaxially surrounds the screw mechanism 19, and a flange portion 35c that is integrally connected to an end portion of the cylindrical portion 35a on the electric motor 17 side via a conical portion 35b.
  • the flange portion 35c is sandwiched together with the seal member 36 between the annular shoulder portion 16a of the sub body 1b and the end surface of the electric motor 17 pressed against the flange portion 35a.
  • the seal member 36 includes a seal lip 36a that is in close contact with the base outer peripheral surface of the output shaft 18, and the conical portion 35b of the dust cover 35 presses and holds the seal lip 36a radially inward. .
  • the tip of the cylindrical portion 35a of the dust cover 35 ends at a position close to the flange 22b of the drive member 22 that presses the joint member 26 at the fully open side movement limit position of the bypass valve 10.
  • the sub-body 1b is provided with an electronic control unit (not shown), and the electronic control unit is based on output signals from various sensors such as a throttle sensor, an intake air temperature sensor, a boost negative pressure sensor, etc.
  • the operating state of the engine such as idling or engine braking is determined, and the electric motor 17 is rotated forward or backward in response to the determination.
  • the intake air flowing into the bypass 4 is usually filtered by an air cleaner (not shown) connected to the upstream side of the intake passage 2, but fine dust often passes through the air cleaner and flows into the bypass 4 together with the intake air.
  • an air cleaner not shown
  • the dust flows into the valve hole 5 from the upstream passage 4a of the bypass 4 together with the intake air, rises in the valve hole 5, and tries to pass through the sliding gap of the bypass valve 10 in the valve hole 5 from below to above.
  • the bypass valve 10 has a concave groove 34 for dust trap on its outer periphery, the dust is captured by the concave groove 34 and the passage of the dust to the sliding gap of the bypass valve 10 is prevented. Can do.
  • the concave groove 34 is formed as a slope 34b whose one inner surface on the inlet hole 5a side of the valve hole 5 is inclined toward the inlet hole 5a, and whose other side surface is a flat surface 34a perpendicular to the axis Y of the bypass valve 10. Therefore, it is possible to prevent the dust trapped in the concave groove 34 from escaping upward from the concave groove 34 by the flat surface 34a as much as possible, and the escape of the dust downward to the bypass valve 10 is promoted by the inclined surface 34b. The Therefore, it is possible to prevent the dust from adhering and accumulating on the screw mechanism 19, that is, the screw shaft 18a and the screw hole 22a, ensuring the smooth operation of the screw mechanism 19, and improving the stability of the bypass intake air amount control characteristics. Can be achieved.
  • the concave groove 34 is formed in an arc shape so that the end of the bypass valve 10 ends in front of the measuring hole 5b on the outer peripheral surface in the vicinity of the notch 15 that opens and closes the measuring hole 5b.
  • the dust can be immediately captured by the concave groove 34, and the mutual communication between the concave groove 34 and the measuring hole 5b is interrupted.
  • it is possible to avoid the concave groove 34 from interfering with the measuring function of the measuring hole 5b.
  • the bypass valve 10 is normally provided with the metering hole 5b by the intake negative pressure of the engine acting on the downstream passage 4b of the bypass 4. Is attracted to the inner surface of the valve hole 5 that opens, the metering hole 5b is in close contact with the inner surface of the valve hole 5, the sliding gap becomes zero, and the upward movement of dust can be prevented.
  • the concave groove 34 is formed deeper in the thick portion 10b where the joint member 26 of the bypass valve 10 is fitted than the thickness of the other thin portion 10a, the function of capturing the dust in the concave groove 34 is enhanced. In addition, it is possible to reduce the flesh from the bypass valve 10 to reduce its weight and to improve responsiveness.
  • the dust cover 35 attached to the sub body 1 b connects the output shaft 18 of the electric motor 17 and the drive member 22 to each other. Therefore, adhesion and accumulation of the dust on the screw mechanism 19 can be prevented more reliably.
  • the deviation is the movement of the joint member 26 of the Oldham joint 20 along the first lateral direction X1.
  • the movement of the drive member 22 along the second lateral direction X2 can ensure smooth sliding of the bypass valve 10 regardless of the deviation, and at the same time, the bypass is bypassed by the set spring 28.
  • the vibration of the valve 10 can be suppressed.
  • the Oldham joint 20 is provided on the bottom wall 21 of the bottomed hollow portion 21 of the bypass valve 10, it is possible to prevent interference between the Oldham joint 20 and the dust cover 35 disposed in the hollow portion 21. Therefore, the Oldham joint 20 and the dust cover 35 can be compactly accommodated in the bypass valve 10, which can contribute to the compactness of the bypass intake air amount control device A.
  • the screw hole 22a between the set pin 27 and the stopper pin 30 is filled with grease 31, the grease 31 is held between the set pin 27 and the stopper pin 30 to fill the screw hole 22a. Become. Therefore, the screw hole 22a can be closed without fitting a special plug to the screw hole 22a, and dust can be prevented from entering the screw mechanism 19 from the screw hole 22a.
  • FIGS. 6 and 7 Next, a second embodiment of the present invention shown in FIGS. 6 and 7 will be described.
  • the thick portion 10b into which the joint member 26 of the bypass valve 10 is fitted is arranged so as to be above the measuring hole 5b even when the bypass valve 10 is fully closed.
  • a concave groove 34 for dust trap is formed in an annular shape deeper than the thickness of the thin portion 10 a of the bypass valve 10 on the outer peripheral surface of the bypass valve 10.
  • the dust cover 35 in the previous embodiment is abolished. Since the other configuration is the same as that of the previous embodiment, portions corresponding to those of the previous embodiment in FIG. 6 and FIG.
  • the annular and deep groove 34 can be formed on the outer peripheral surface of the bypass valve 10, and the dust trapping function of the groove 34 can be enhanced over the entire periphery of the bypass valve 10. .
  • a plurality of concave grooves 34 can be arranged in the direction of the axis Y of the bypass valve 10.
  • the throttle body 1 can be integrally formed without dividing the throttle body 1 into the main body 1a and the sub body 1b.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

A device for controlling the amount of bypassed intake air, the device being configured in such a manner that a bypass (4) which bypasses a throttle valve (3) and is connected to an air intake path (2) and a cylinder-like valve hole (5) which connects to the bypass (4) are provided in a throttle body (1), a piston-like bypass valve (10) which opens and closes the bypass (4) by moving in the axial direction is slidably and non-rotatably fitted in the valve hole (5), and the bypass valve (10) and the output shaft (18) of an actuator (17) which is mounted to the throttle body (1) are connected to each other through a screw mechanism (19).  The configuration above allows the bypass valve (10) to be opened and closed in the axial direction by rotation of the output shaft (18).  Also, a dust trapping groove (34) is formed in the outer peripheral surface of the bypass valve (10) so as to extend in the circumferential direction of the outer peripheral surface.  This prevents fine dust flowing together with intake air into a valve chamber from passing through the sliding gap between the bypass valve (10) and the valve hole, ensuring smooth operation of the screw mechanism.

Description

バイパス吸気量制御装置Bypass intake air amount control device
　本発明は，スロットル弁により開閉される吸気道を有するスロットルボディに，スロットル弁を迂回して吸気道に接続されるバイパスと，このバイパスに介入するシリンダ状の弁孔とを設け，この弁孔には，軸方向の動きでバイパスを開閉するピストン状のバイパス弁を摺動自在且つ回転不能に嵌装し，このバイパス弁と，スロットルボディに取り付けられるアクチュエータの出力軸とをねじ機構を介して連結して，出力軸の回転によりバイパス弁を軸方向に開閉駆動するようにしたバイパス吸気量制御装置の改良に関する。 According to the present invention, a throttle body having an intake passage that is opened and closed by a throttle valve is provided with a bypass that bypasses the throttle valve and is connected to the intake passage, and a cylindrical valve hole that intervenes in the bypass. The piston-type bypass valve that opens and closes the bypass by axial movement is fitted slidably and non-rotatably, and the bypass valve and the output shaft of the actuator attached to the throttle body are connected via a screw mechanism. The present invention relates to an improvement of a bypass intake air amount control device that is connected to open and close a bypass valve in the axial direction by rotation of an output shaft.
　かゝるバイパス吸気量制御装置は，下記特許文献１に開示されるように，既に知られている。
日本特許第３９６６８０７号公報 Such a bypass intake air amount control device is already known as disclosed in Patent Document 1 below.
Japanese Patent No. 3966807
　従来のかゝるバイパス吸気量制御装置では，弁孔とバイパス弁との間にはバイパス弁の摺動のための摺動間隙が存在するため，バイパス弁の開放時，バイパスを流れる吸気に多少とも含まれる微細なダストが弁孔内で舞い上がって上記摺動間隙を通過することがあり，そのダストの通過によれば，ダストがねじ機構に付着して，その作動の円滑性を阻害し，バイパス吸気量制御特性を変化させる可能性がある。 In a conventional bypass intake air amount control device, there is a sliding gap for the bypass valve to slide between the valve hole and the bypass valve. The contained fine dust may rise in the valve hole and pass through the sliding gap. When the dust passes, the dust adheres to the screw mechanism, hindering the smoothness of its operation, and bypassing. There is a possibility of changing the intake air amount control characteristics.
　本発明は，かゝる事情に鑑みてなされたもので，吸気と共に弁室に流入した微細なダストが弁孔で舞い上がっても，そのダストがバイパス弁及び弁孔間の間隙を通過しないようにして，ねじ機構の円滑な作動を確保し得るバイパス吸気量制御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 even if fine dust that has flowed into the valve chamber together with intake air rises in the valve hole, the dust is prevented from passing through the gap between the bypass valve and the valve hole. Thus, an object of the present invention is to provide a bypass intake air amount control device that can ensure a smooth operation of the screw mechanism.
　上記目的を達成するために，本発明は，スロットル弁により開閉される吸気道を有するスロットルボディに，スロットル弁を迂回して吸気道に接続されるバイパスと，このバイパスに介入するシリンダ状の弁孔とを設け，この弁孔には，軸方向の動きでバイパスを開閉するピストン状のバイパス弁を摺動自在且つ回転不能に嵌装し，このバイパス弁と，スロットルボディに取り付けられるアクチュエータの出力軸とをねじ機構を介して連結して，出力軸の回転によりバイパス弁を軸方向に開閉駆動するようにしたバイパス吸気量制御装置において，前記バイパス弁の外周面に，その周方向に延びるダストトラップ用の凹溝を設けたことを第１の特徴とする。 In order to achieve the above object, the present invention provides a throttle body having an intake passage that is opened and closed by a throttle valve, a bypass that bypasses the throttle valve and is connected to the intake passage, and a cylindrical valve that intervenes in the bypass. A piston-like bypass valve that opens and closes the bypass by axial movement is fitted into the valve hole in a slidable and non-rotatable manner. The output of the bypass valve and the actuator attached to the throttle body In the bypass intake air amount control device, wherein the bypass valve is driven to open and close in the axial direction by rotating the output shaft by connecting the shaft to the shaft, dust that extends in the circumferential direction on the outer peripheral surface of the bypass valve A first feature is that a concave groove for trapping is provided.
  また本発明は，第１の特徴に加えて，前記弁孔の内側面には，バイパスの下流側に連なっていてバイパス弁の軸方向の移動で開閉される計量孔が開口しており，バイパス弁の外周面上の前記凹溝を，その端部が前記計量孔の手前で終わるよう円弧状に形成したことを第２の特徴とする。 In addition to the first feature of the present invention, the inner surface of the valve hole is provided with a measuring hole that is connected to the downstream side of the bypass and is opened and closed by the axial movement of the bypass valve. A second feature is that the concave groove on the outer peripheral surface of the valve is formed in an arc shape so that an end thereof ends in front of the measuring hole.
  さらに本発明は，第１の特徴に加えて，前記弁孔の内側面には，バイパスの下流側に連なっていてバイパス弁の軸方向の移動で開閉される計量孔が開口しており，バイパス弁の，前記計量孔より前記アクチュエータ側の外周面に前記凹溝を環状に設けたことを第３の特徴とする。 In addition to the first feature of the present invention, the valve hole has a metering hole that is connected to the downstream side of the bypass and is opened and closed by axial movement of the bypass valve. A third feature of the present invention is that the concave groove is annularly provided on the outer peripheral surface of the valve on the actuator side from the metering hole.
  さらにまた本発明は，第１の特徴に加えて，前記ねじ機構を，前記出力軸に連設されるねじ軸と，このねじ軸に螺合するねじ孔を持った駆動部材とで構成し，この駆動部材を前記バイパス弁に連結するオルダムジョイントをバイパス弁の周壁の厚肉部内に配設し，その厚肉部の外周に前記凹溝を形成したことを第４の特徴とする。 Furthermore, in addition to the first feature of the present invention, the screw mechanism includes a screw shaft connected to the output shaft and a drive member having a screw hole screwed to the screw shaft. A fourth feature is that an Oldham joint for connecting the drive member to the bypass valve is disposed in a thick portion of the peripheral wall of the bypass valve, and the concave groove is formed in the outer periphery of the thick portion.
  さらにまた本発明は，第１の特徴に加えて，前記スロットルボディの使用状態では，バイパス弁は，その軸線が上下方向に向かうように配置され，前記凹溝における，前記弁孔の入口孔側の下側面を該入口孔側に傾斜した斜面で構成する一方，それと反対側の上側面を平坦面で構成したことを第５の特徴とする。 In addition to the first feature of the present invention, the bypass valve is arranged so that its axis is directed in the vertical direction when the throttle body is in use, and the concave groove has an inlet hole side of the valve hole. A fifth feature is that the lower side surface is formed of a slope inclined toward the inlet hole side, and the upper side surface opposite to the lower side surface is formed of a flat surface.
  本発明の第１の特徴によれば，ダストが吸気と共にバイパスの上流側から弁孔に流入し，弁孔内で舞い上がって，弁孔及びバイパス弁間の摺動間隙をアクチュエータ側に通過しようとしても，バイパス弁は，その外周にダストトラップ用の凹溝を備えているので，その凹溝で上記ダストを捕捉し，上記ダストの上記摺動間隙への通過を防ぐことができる。したがって，上記ダストがねじ機構に付着，堆積することを防ぐことができ，ねじ機構の作動の円滑性を確保することができる。 According to the first feature of the present invention, dust flows into the valve hole from the upstream side of the bypass together with the intake air, and rises in the valve hole and tries to pass through the sliding gap between the valve hole and the bypass valve to the actuator side. However, since the bypass valve has a concave groove for dust trap on its outer periphery, the dust can be captured by the concave groove and the passage of the dust to the sliding gap can be prevented. Therefore, the dust can be prevented from adhering and accumulating on the screw mechanism, and the smoothness of the operation of the screw mechanism can be ensured.
  本発明の第２の特徴によれば，弁孔に流入したダストが弁孔及びバイパス弁間の摺動間隙に侵入するや否や，即座にそのダストを凹溝により捕捉することができる。しかも，円弧状の凹溝の端部を計量孔の手前で終わらせていることから，凹溝と計量孔とは連通を遮断した状態にあるから，凹溝が計量孔の計量機能に干渉することを回避し得る。また計量孔側では，バイパス弁の外周面に凹溝が存在せずとも，バイパス弁は，通常，バイパスの下流側に作用するエンジンの吸気負圧により，計量孔が開口する弁孔の内側面に引きつけられるので，計量孔側では弁孔の内側面に密着し，その摺動間隙はゼロとなり，ダストのねじ機構側への移行を防ぐことができる。 According to the second feature of the present invention, as soon as the dust flowing into the valve hole enters the sliding gap between the valve hole and the bypass valve, the dust can be immediately captured by the concave groove. In addition, since the end of the arc-shaped groove is terminated before the measuring hole, the groove and the measuring hole are disconnected from each other, so that the groove interferes with the measuring function of the measuring hole. You can avoid that. On the metering hole side, even if there is no concave groove on the outer peripheral surface of the bypass valve, the bypass valve is usually the inner surface of the valve hole where the metering hole opens due to negative intake air pressure of the engine acting downstream of the bypass. Therefore, the metering hole is in close contact with the inner surface of the valve hole, and its sliding gap becomes zero, preventing the dust from moving to the screw mechanism side.
  本発明の第３の特徴によれば，環状の凹溝をバイパス弁の外周面に形成することにより，バイパス弁の全周に亙り凹溝のダスト捕捉機能を高めることができる。 According to the third feature of the present invention, by forming the annular groove on the outer peripheral surface of the bypass valve, the dust trapping function of the groove can be enhanced over the entire periphery of the bypass valve.
  本発明の第４の特徴によれば，凹溝は，バイパス弁のジョイント部材が嵌合する厚肉部に，他の薄肉部の肉厚より深く形成されることになり，凹溝のダスト対する捕捉機能を高めることができると共に，バイパス弁から駄肉を極力削減して，その軽量化，延いては応答性を図ることができる。 According to the fourth feature of the present invention, the concave groove is formed deeper in the thick part where the joint member of the bypass valve is fitted than in the thickness of the other thin part, and thus the concave groove is free from dust in the concave groove. In addition to enhancing the capture function, it is possible to reduce the waste meat from the bypass valve as much as possible, to reduce its weight and to improve responsiveness.
  本発明の第５の特徴によれば，凹溝で捕捉されたダストの凹溝から上方のアクチュエータ側への脱出を平坦面によって極力防ぐことができ，また上記ダストのバイパス弁下方への脱出を斜面によって促進することができる。 According to the fifth aspect of the present invention, it is possible to prevent the dust trapped in the concave groove from escaping from the concave groove to the upper actuator side as much as possible by the flat surface, and to prevent the dust from escaping below the bypass valve. Can be promoted by slope.
図１は本発明の第１実施例に係るバイパス吸気量制御装置をバイパス弁の全閉状態で示す縦断面図である。（第１実施例）FIG. 1 is a longitudinal sectional view showing a bypass intake air amount control apparatus according to a first embodiment of the present invention in a fully closed state of a bypass valve. (First embodiment) 図２は同装置をバイパス弁の全開状態で示す縦断面図である。（第１実施例）FIG. 2 is a longitudinal sectional view showing the apparatus with the bypass valve fully opened. (First embodiment) 図３は図２の３－３線断面図である。（第１実施例）3 is a cross-sectional view taken along line 3-3 of FIG. (First embodiment) 図４は図３の４－４線断面図である。（第１実施例）4 is a cross-sectional view taken along line 4-4 of FIG. (First embodiment) 図５は同装置におけるバイパス弁の斜視図である。（第１実施例）FIG. 5 is a perspective view of a bypass valve in the apparatus. (First embodiment) 図６は本発明の第２実施例を示す，図２との対応図である。（第２実施例）FIG. 6 is a diagram corresponding to FIG. 2, showing a second embodiment of the present invention. (Second embodiment) 図７は図６の７－７線断面図である。（第２実施例）7 is a cross-sectional view taken along line 7-7 of FIG. (Second embodiment)
Ａ・・・・・バイパス吸気量制御装置
Ｙ・・・・・バイパス弁の軸線
１・・・・・スロットルボディ
２・・・・・吸気道
３・・・・・スロットル弁
４・・・・・バイパス
５・・・・・弁孔
５ａ・・・・入口孔
５ｂ・・・・計量孔
１０・・・・バイパス弁
１０ａ・・・薄肉部
１０ｂ・・・厚肉部
１７・・・・アクチュエータ（電動モータ）
１８・・・・出力軸
１８ａ・・・ねじ軸
１９・・・・ねじ機構
２０・・・・オルダムジョイント
２２・・・・駆動部材
２２ａ・・・ねじ孔
３４・・・・凹溝
３４ａ・・・平坦面
３４ｂ・・・斜面 A ... Bypass intake air amount control device Y ... Bypass valve axis 1 ... Throttle body 2 ... Intake passage 3 ... Throttle valve 4 ... -Bypass 5-Valve hole 5a-Inlet hole 5b-Metering hole 10-Bypass valve 10a-Thin part 10b-Thick part 17-Actuator (Electric motor)
18 ... Output shaft 18a ... Screw shaft 19 ... Screw mechanism 20 ... Oldham joint 22 ... Drive member 22a ... Screw hole 34 ... Groove 34a ...・ Flat surface 34b ... slope
　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.
　先ず，図１～図５に示す本発明の第１実施例の説明より始める。 First, the description starts with the description of the first embodiment of the present invention shown in FIGS.
　図１及び図２において，本発明のバイパス吸気量制御装置Ａは，エンジンのシリンダヘッド（図示せず）に取り付けられるスロットルボディ１を有する。このスロットルボディ１は，エンジンの吸気ポートに連なる吸気道２を有するメインボディ１ａと，このメインボディ１ａの一側にボルト接合されるサブボディ１ｂとで構成され，メインボディ１ａには，吸気道２を開閉するバタフライ型のスロットル弁３が軸支され，このスロットル弁３を迂回して吸気道２に接続されるバイパス４がメインボディ１ａからサブボディ１ｂに亙り形成される。 1 and 2, the bypass intake air amount control device A of the present invention has a throttle body 1 attached to a cylinder head (not shown) of the engine. The throttle body 1 is composed of a main body 1a having an intake passage 2 connected to an intake port of the engine and a sub body 1b bolted to one side of the main body 1a. The main body 1a includes an intake passage 2 A butterfly throttle valve 3 that opens and closes is pivotally supported, and a bypass 4 that bypasses the throttle valve 3 and is connected to the intake passage 2 is formed from the main body 1a to the sub body 1b.
　サブボディ１ｂには，バイパス４を吸気道２の上流側に連なる上流側通路４ａと，吸気道２の下流側に連なる下流側通路４ｂとに分割する有底シリンダ状の弁孔５が形成される。この弁孔５の底面には，上流側通路４ａの下流端が弁孔５の入口孔５ａとして開口し，また弁孔５の一側面には下流側通路４ｂの上流端が計量孔５ｂとして開口する。メインボディ１ａ及びサブボディ１ｂの接合面間には，これら接合面を貫通する上記上流側通路４ａ及び下流側通路４ｂをそれぞれ囲繞するＯリング７，８が介装される。 The sub-body 1b is formed with a bottomed cylindrical valve hole 5 that divides the bypass 4 into an upstream passage 4a that communicates with the upstream side of the intake passage 2 and a downstream passage 4b that communicates with the downstream side of the intake passage 2. . The downstream end of the upstream passage 4a opens as an inlet hole 5a of the valve hole 5 on the bottom surface of the valve hole 5, and the upstream end of the downstream passage 4b opens as a measuring hole 5b on one side of the valve hole 5. To do. Between the joint surfaces of the main body 1a and the sub body 1b, O- rings 7 and 8 surrounding the upstream passage 4a and the downstream passage 4b penetrating the joint surfaces are interposed.
　弁孔５には，入口孔５ａ及び計量孔５ｂ間を開閉するピストン状のバイパス弁１０が摺動自在に嵌装される。その際，バイパス弁１０及びサブボディ１ｂ間には，バイパス弁１０の回転を阻止する回り止め手段１１が設けられる。この回り止め手段１１は，計量孔５ｂと反対側でバイパス弁１０の一側面に形成されてバイパス弁１０の軸線Ｙ方向に延びるキー溝１２と，このキー溝１２に摺動可能に係合すべくサブボディ１ｂに螺着されるキー１３とで構成され，キー溝１２の，電動モータ１７側の端部は，バイパス弁１０の外周面に一体に連続する隔壁１４により閉鎖される。 In the valve hole 5, a piston-like bypass valve 10 that opens and closes between the inlet hole 5a and the measuring hole 5b is slidably fitted. At that time, between the bypass valve 10 and the sub body 1b, a rotation preventing means 11 for preventing the bypass valve 10 from rotating is provided. The anti-rotation means 11 is formed on one side of the bypass valve 10 on the side opposite to the measuring hole 5b and extends in the axis Y direction of the bypass valve 10 and slidably engages with the key groove 12. Thus, the key 13 is screwed into the sub-body 1b, and the end of the key groove 12 on the electric motor 17 side is closed by a partition wall 14 that is integrally continuous with the outer peripheral surface of the bypass valve 10.
　またバイパス弁１０の他側面には，入口孔５ａに向けて開口する計量用の切欠き１５が設けられ，この切欠き１５と計量孔５ｂとの連通度合をゼロから最大まで調節するように，バイパス弁１０は，図１の全閉位置から図２の全開位置へと軸方向に移動することができる。 The other side surface of the bypass valve 10 is provided with a measurement notch 15 that opens toward the inlet hole 5a, and the degree of communication between the notch 15 and the measurement hole 5b is adjusted from zero to the maximum. The bypass valve 10 can move in the axial direction from the fully closed position of FIG. 1 to the fully open position of FIG.
　サブボディ１ｂには，弁孔５の，入口孔５ａと反対側の端部に環状肩部１６ａを介して同軸に連なる取り付け孔１６が設けられ，この取り付け孔１６に電動モータ１７が装着される。この電動モータ１７の出力軸１８に，ねじ機構１９及びオルダムジョイント２０を順次介してバイパス弁１０が連結される。バイパス弁１０には，電動モータ１７側に開口する有底の中空部２１が設けられており，この中空部２１にねじ機構１９が収容され，中空部２１の底壁２１ａにオルダムジョイント２０が設けられる。 The sub-body 1b is provided with an attachment hole 16 that is coaxially connected to the end of the valve hole 5 opposite to the inlet hole 5a via an annular shoulder 16a, and an electric motor 17 is attached to the attachment hole 16. The bypass valve 10 is connected to the output shaft 18 of the electric motor 17 through a screw mechanism 19 and an Oldham joint 20 in order. The bypass valve 10 is provided with a bottomed hollow portion 21 that opens to the electric motor 17 side. The screw mechanism 19 is accommodated in the hollow portion 21, and the Oldham joint 20 is provided on the bottom wall 21 a of the hollow portion 21. It is done.
　ねじ機構１９は，電動モータ１７の出力軸１８に一体に連設されるねじ軸１８ａと，このねじ軸１８ａが螺合するねじ孔２２ａを持った駆動部材２２とで構成される。 The screw mechanism 19 includes a screw shaft 18a integrally connected to the output shaft 18 of the electric motor 17, and a drive member 22 having a screw hole 22a into which the screw shaft 18a is screwed.
　またオルダムジョイント２０は，図２及び図３に示すように，バイパス弁１０の有底の中空部２１の底壁２１ａに設けられる第１角孔２４と，この第１角孔２４に第１の横方向Ｘ１での摺動を可能として嵌合されるジョイント部材２６と，このジョイント部材２６に設けられ，前記駆動部材２２が第１の横方向Ｘ１と直角をなす第２の横方向Ｘ２での摺動を可能として嵌合される第２角孔２５とで構成される。駆動部材２２は，ジョイント部材２６及び前記底壁２１ａを貫通するように比較的長く形成されており，これを前記ねじ孔２２ａが軸方向に貫通している。この駆動部材２２の中間部には，ジョイント部材２６の外端面に当接するフランジ２２ｂが形成される。 2 and 3, the Oldham joint 20 includes a first square hole 24 provided in the bottom wall 21a of the bottomed hollow portion 21 of the bypass valve 10, and a first square hole 24. A joint member 26 fitted so as to be slidable in the lateral direction X1, and the drive member 22 provided in the joint member 26 in the second lateral direction X2 perpendicular to the first lateral direction X1. It is comprised with the 2nd square hole 25 fitted so that sliding is possible. The drive member 22 is formed relatively long so as to penetrate the joint member 26 and the bottom wall 21a, and the screw hole 22a penetrates the drive member 22 in the axial direction. A flange 22 b that abuts against the outer end surface of the joint member 26 is formed at the intermediate portion of the drive member 22.
　また駆動部材２２の，前記底壁２１ａ外に突出した外端部には，これを横断するようにセットピン２７が嵌装され，このセットピン２７とバイパス弁１０の間に円錐コイル状のセットばね２８が縮設され，このセットばね２８は，その圧縮反発力により駆動部材２２のフランジ２２ｂをジョイント部材２６の外端面に押しつけて，ジョイント部材２６を前記底壁２１ａとの当接状態に保持する。 Further, a set pin 27 is fitted on the outer end of the drive member 22 projecting out of the bottom wall 21 a so as to cross the drive member 22, and a conical coil-shaped set between the set pin 27 and the bypass valve 10. The spring 28 is contracted, and the set spring 28 presses the flange 22b of the drive member 22 against the outer end surface of the joint member 26 by the compression repulsive force, thereby holding the joint member 26 in contact with the bottom wall 21a. To do.
　さらに駆動部材２２には，セットピン２７より軸方向内側に位置するストッパピン３０が駆動部材２２を横断するように装着される。このストッパピン３０は，前記ねじ軸１８ａの先端を受け止めてバイパス弁１０の全開側移動限界を規制するようになっている。 Further, a stopper pin 30 positioned on the inner side in the axial direction from the set pin 27 is mounted on the drive member 22 so as to cross the drive member 22. The stopper pin 30 receives the tip of the screw shaft 18a and regulates the fully open side movement limit of the bypass valve 10.
　上記セットピン２７及びストッパピン３０間において，ねじ孔２２ａにはそれを塞ぐようにグリース３１が充填される。 Between the set pin 27 and the stopper pin 30, the screw hole 22a is filled with grease 31 so as to close it.
　上記２本のピン２７，３０は，何れもスプリングピンで構成され，それぞれの駆動部材２２の取り付け孔３２，３３内周面に弾発密着することで保持される。 The two pins 27 and 30 are both spring pins, and are held by elastically contacting the inner peripheral surfaces of the mounting holes 32 and 33 of the respective drive members 22.
　図１～図５，特に図３～図５に示すように，バイパス弁１０の外周面には，その周方向に延びる断面ＵもしくはＶ字状のダストトラップ用の凹溝３４が設けられる。この第１実施例の場合，バイパス弁１０の前記ジョイント部材２６が嵌合する部分１０ｂは，他の薄肉部１０ａより肉厚が厚い厚肉部１０ｂとなっており，この厚肉部１０ｂは，計量孔５ｂの，バイパス弁１０の軸線Ｙ方向に沿う上下幅領域に略収まるよう，バイパス弁１０の切欠き１５近傍に配置される。そして，上記厚肉部１０ｂの外周に前記凹溝３４が，薄肉部１０ａの肉厚より深く，且つ両端部を計量孔５ｂ及びキー溝１２の手前で終わらせるよう円弧状に一対形成される。尚，キー溝１２の上端は閉じているので，凹溝３４をキー溝１２に連通させても支障はない。 As shown in FIGS. 1 to 5, particularly FIGS. 3 to 5, the outer circumferential surface of the bypass valve 10 is provided with a U-shaped or U-shaped concave groove 34 for dust traps extending in the circumferential direction. In the case of the first embodiment, the portion 10b where the joint member 26 of the bypass valve 10 is fitted is a thick portion 10b that is thicker than the other thin portions 10a. The metering hole 5b is arranged in the vicinity of the notch 15 of the bypass valve 10 so as to be approximately within the vertical width region along the axis Y direction of the bypass valve 10. A pair of concave grooves 34 are formed on the outer periphery of the thick portion 10b in a circular arc shape so as to be deeper than the thickness of the thin portion 10a and end at both ends before the measuring hole 5b and the key groove 12. Since the upper end of the key groove 12 is closed, there is no problem even if the concave groove 34 is communicated with the key groove 12.
  さらにスロットルボディ１の使用状態では，バイパス弁１０は，その軸線Ｙが上下方向に向かうように配置され，前記凹溝３４の入口孔５ａ側の下側面は，入口孔５ａ側に傾斜した斜面３４ｂに形成され，それと反対側の上側面は，バイパス弁１０の軸線Ｙと直交する平坦面３４ａに形成される。 Further, when the throttle body 1 is in use, the bypass valve 10 is arranged so that its axis Y is directed in the vertical direction, and the lower side surface of the concave groove 34 on the inlet hole 5a side is a slope 34b inclined to the inlet hole 5a side. The upper surface on the opposite side is formed on a flat surface 34a that is orthogonal to the axis Y of the bypass valve 10.
  またサブボディ１ｂには，特にバイパス弁１０が全開位置もしくはその近傍位置を占めるとき，バイパス弁１０の有底中空部２１において前記ねじ機構１９を囲繞するダストカバー３５が取り付けられる。このダストカバー３５は，ねじ機構１９を同軸状に取り囲む円筒部３５ａと，この円筒部３５ａの，電動モータ１７側端部に円錐部３５ｂを介して一体に連設されるフランジ部３５ｃとからなっており，このフランジ部３５ｃは，サブボディ１ｂの前記環状肩部１６ａと，それに対して押圧保持される電動モータ１７の端面との間に，シール部材３６と共に挟持される。シール部材３６は，出力軸１８の根元外周面に密接するシールリップ３６ａを備えており，ダストカバー３５の前記円錐部３５ｂが上記シールリップ３６ａを半径方向内方に押圧保持するようになっている。 Further, a dust cover 35 that surrounds the screw mechanism 19 in the bottomed hollow portion 21 of the bypass valve 10 is attached to the sub-body 1b, particularly when the bypass valve 10 occupies the fully open position or a position in the vicinity thereof. The dust cover 35 includes a cylindrical portion 35a that coaxially surrounds the screw mechanism 19, and a flange portion 35c that is integrally connected to an end portion of the cylindrical portion 35a on the electric motor 17 side via a conical portion 35b. The flange portion 35c is sandwiched together with the seal member 36 between the annular shoulder portion 16a of the sub body 1b and the end surface of the electric motor 17 pressed against the flange portion 35a. The seal member 36 includes a seal lip 36a that is in close contact with the base outer peripheral surface of the output shaft 18, and the conical portion 35b of the dust cover 35 presses and holds the seal lip 36a radially inward. .
　ダストカバー３５の円筒部３５ａの先端は，バイパス弁１０の全開側移動限界位置において，駆動部材２２の，ジョイント部材２６を押えるフランジ２２ｂに当接する手前で終わっている。 The tip of the cylindrical portion 35a of the dust cover 35 ends at a position close to the flange 22b of the drive member 22 that presses the joint member 26 at the fully open side movement limit position of the bypass valve 10.
　さらにサブボディ１ｂには図示しない電子制御ユニットが備えられ，その電子制御ユニットがスロットルセンサ，吸気温センサ及びブースト負圧センサ等の各種センサの出力信号に基づいて，エンジン始動時，ファストアイドリング時，通常アイドリング時，エンジンブレーキ時などのエンジンの運転状態を判定し，それに応じて電動モータ１７を正転又は逆転作動するようになっている。 Further, the sub-body 1b is provided with an electronic control unit (not shown), and the electronic control unit is based on output signals from various sensors such as a throttle sensor, an intake air temperature sensor, a boost negative pressure sensor, etc. The operating state of the engine such as idling or engine braking is determined, and the electric motor 17 is rotated forward or backward in response to the determination.
　次に，この実施例の作用について説明する。 Next, the operation of this embodiment will be described.
　電動モータ１７の出力軸１８が正転又は逆転すると，駆動部材２２がねじ機構１９の軸方向送り作用を受けて軸方向に進退し，ジョイント部材２６を介してバイパス弁１０を弁孔５に沿って軸方向に摺動させ，切欠き１５と計量孔５ｂとの連通度合，即ちバイパス４の開度を増減させて，バイパス４の上流側通路４ａ，弁孔５，切欠き１５及び下流側通路４ｂを順次通過する，エンジンのバイパス吸気流量を制御することができる。 When the output shaft 18 of the electric motor 17 is rotated forward or backward, the drive member 22 is moved forward and backward in the axial direction by the axial feed action of the screw mechanism 19, and the bypass valve 10 is moved along the valve hole 5 via the joint member 26. The degree of communication between the notch 15 and the measuring hole 5b, that is, the opening degree of the bypass 4 is increased / decreased, so that the upstream side passage 4a, the valve hole 5, the notch 15 and the downstream side passage of the bypass 4 It is possible to control the bypass intake flow rate of the engine that sequentially passes through 4b.
  ところで，バイパス４を流入する吸気は，通常，吸気道２の上流側に接続されるエアクリーナ（図示せず）で濾過されるが，しばしば微細なダストがエアクリーナを通過して吸気と共にバイパス４に流入することがある。そうした場合，そのダストが吸気と共にバイパス４の上流側通路４ａから弁孔５に流入し，弁孔５内で舞い上がって，弁孔５におけるバイパス弁１０の摺動間隙を下方から上方へ通過しようとしても，バイパス弁１０は，その外周にダストトラップ用の凹溝３４を備えているので，その凹溝３４で上記ダストを捕捉し，上記ダストのバイパス弁１０の摺動間隙への通過を防ぐことができる。そして，上記凹溝３４は，弁孔５の入口孔５ａ側の一方の内側面が入口孔５ａ側に傾斜した斜面３４ｂに形成され，他側面がバイパス弁１０の軸線Ｙに直交する平坦面３４ａに形成されるので，凹溝３４で捕捉したダストの凹溝３４から上方への脱出を平坦面３４ａによって極力防ぐことができ，また上記ダストのバイパス弁１０下方への脱出が斜面３４ｂによって促進される。したがって，上記ダストがねじ機構１９，即ちねじ軸１８ａやねじ孔２２ａに付着，堆積することを防ぐことができ，ねじ機構１９の作動の円滑性を確保し，バイパス吸気量制御特性の安定性向上を図ることができる。 Incidentally, the intake air flowing into the bypass 4 is usually filtered by an air cleaner (not shown) connected to the upstream side of the intake passage 2, but fine dust often passes through the air cleaner and flows into the bypass 4 together with the intake air. There are things to do. In such a case, the dust flows into the valve hole 5 from the upstream passage 4a of the bypass 4 together with the intake air, rises in the valve hole 5, and tries to pass through the sliding gap of the bypass valve 10 in the valve hole 5 from below to above. In addition, since the bypass valve 10 has a concave groove 34 for dust trap on its outer periphery, the dust is captured by the concave groove 34 and the passage of the dust to the sliding gap of the bypass valve 10 is prevented. Can do. The concave groove 34 is formed as a slope 34b whose one inner surface on the inlet hole 5a side of the valve hole 5 is inclined toward the inlet hole 5a, and whose other side surface is a flat surface 34a perpendicular to the axis Y of the bypass valve 10. Therefore, it is possible to prevent the dust trapped in the concave groove 34 from escaping upward from the concave groove 34 by the flat surface 34a as much as possible, and the escape of the dust downward to the bypass valve 10 is promoted by the inclined surface 34b. The Therefore, it is possible to prevent the dust from adhering and accumulating on the screw mechanism 19, that is, the screw shaft 18a and the screw hole 22a, ensuring the smooth operation of the screw mechanism 19, and improving the stability of the bypass intake air amount control characteristics. Can be achieved.
  特に，この第１実施例の場合，前記凹溝３４は，バイパス弁１０の，計量孔５ｂを開閉する切欠き１５近傍の外周面に端部を計量孔５ｂの手前で終わらせるよう円弧状に形成されるので，ダストがバイパス弁１０の摺動間隙に侵入するや否や，そのダストを凹溝３４により即座に捕捉することができ，しかも，凹溝３４と計量孔５ｂとの相互連通を遮断して，凹溝３４が計量孔５ｂの計量機能に干渉することを回避し得る。また計量孔５ｂ側では，バイパス弁１０の外周面に凹溝３４が存在せずとも，バイパス弁１０は，通常，バイパス４の下流側通路４ｂに作用するエンジンの吸気負圧により，計量孔５ｂが開口する弁孔５の内側面に引きつけられるので，計量孔５ｂ側では弁孔５の内側面に密着し，その摺動間隙はゼロとなり，ダストの上方への移行を防ぐことができる。 In particular, in the case of the first embodiment, the concave groove 34 is formed in an arc shape so that the end of the bypass valve 10 ends in front of the measuring hole 5b on the outer peripheral surface in the vicinity of the notch 15 that opens and closes the measuring hole 5b. As soon as the dust enters the sliding gap of the bypass valve 10, the dust can be immediately captured by the concave groove 34, and the mutual communication between the concave groove 34 and the measuring hole 5b is interrupted. Thus, it is possible to avoid the concave groove 34 from interfering with the measuring function of the measuring hole 5b. Further, on the metering hole 5b side, even if the outer peripheral surface of the bypass valve 10 is not provided with the concave groove 34, the bypass valve 10 is normally provided with the metering hole 5b by the intake negative pressure of the engine acting on the downstream passage 4b of the bypass 4. Is attracted to the inner surface of the valve hole 5 that opens, the metering hole 5b is in close contact with the inner surface of the valve hole 5, the sliding gap becomes zero, and the upward movement of dust can be prevented.
  また前記凹溝３４は，バイパス弁１０のジョイント部材２６が嵌合する厚肉部１０ｂに，他の薄肉部１０ａの肉厚より深く形成されるので，凹溝３４のダストに対する捕捉機能を高めることができると共に，バイパス弁１０から駄肉を削減して，その軽量化，延いては応答性を図ることができる。 Further, since the concave groove 34 is formed deeper in the thick portion 10b where the joint member 26 of the bypass valve 10 is fitted than the thickness of the other thin portion 10a, the function of capturing the dust in the concave groove 34 is enhanced. In addition, it is possible to reduce the flesh from the bypass valve 10 to reduce its weight and to improve responsiveness.
  万一，上記凹溝３４を通り過ぎてバイパス弁１０の上方に出るダストがあっても，サブボディ１ｂに取り付けられるダストカバー３５が電動モータ１７の出力軸１８及び駆動部材２２間を連結するねじ機構１９を囲繞しているから，上記ダストのねじ機構１９への付着，堆積をより確実に防ぐことができる。 Even if there is dust that passes through the concave groove 34 and exits above the bypass valve 10, the dust cover 35 attached to the sub body 1 b connects the output shaft 18 of the electric motor 17 and the drive member 22 to each other. Therefore, adhesion and accumulation of the dust on the screw mechanism 19 can be prevented more reliably.
　バイパス弁１０と，電動モータ１７の出力軸１８との軸線相互に製作誤差に起因するずれがある場合には，そのずれは，オルダムジョイント２０のジョイント部材２６の第１の横方向Ｘ１に沿う移動と，駆動部材２２の第２の横方向Ｘ２に沿う移動とに吸収されるから，そのずれにも拘らず，バイパス弁１０のスムーズな摺動を保証することができ，同時にセットばね２８によりバイパス弁１０の振動を抑制することができる。しかも，オルダムジョイント２０は，バイパス弁１０の有底の中空部２１の底壁２１に設けられるので，このオルダムジョイント２０と，上記中空部２１に配置されるダストカバー３５との干渉を防ぐことができ，したがってオルダムジョイント２０及びダストカバー３５をバイパス弁１０にコンパクト収めることができて，バイパス吸気量制御装置Ａのコンパクト化に寄与し得る。 If there is a deviation due to manufacturing errors between the axes of the bypass valve 10 and the output shaft 18 of the electric motor 17, the deviation is the movement of the joint member 26 of the Oldham joint 20 along the first lateral direction X1. And the movement of the drive member 22 along the second lateral direction X2 can ensure smooth sliding of the bypass valve 10 regardless of the deviation, and at the same time, the bypass is bypassed by the set spring 28. The vibration of the valve 10 can be suppressed. Moreover, since the Oldham joint 20 is provided on the bottom wall 21 of the bottomed hollow portion 21 of the bypass valve 10, it is possible to prevent interference between the Oldham joint 20 and the dust cover 35 disposed in the hollow portion 21. Therefore, the Oldham joint 20 and the dust cover 35 can be compactly accommodated in the bypass valve 10, which can contribute to the compactness of the bypass intake air amount control device A.
　またセットピン２７とストッパピン３０との間のねじ孔２２ａには，グリース３１が充填されるので，このグリース３１は，セットピン２７及びストッパピン３０間に保持されてねじ孔２２ａを埋めることになる。したがって，ねじ孔２２ａに特別な栓体を嵌合させることなく，ねじ孔２２ａを塞ぐことができ，ねじ孔２２ａからねじ機構１９側へのダストの侵入を防ぐことができる。 Since the screw hole 22a between the set pin 27 and the stopper pin 30 is filled with grease 31, the grease 31 is held between the set pin 27 and the stopper pin 30 to fill the screw hole 22a. Become. Therefore, the screw hole 22a can be closed without fitting a special plug to the screw hole 22a, and dust can be prevented from entering the screw mechanism 19 from the screw hole 22a.
　次に，図６及び図７に示す本発明の第２実施例について説明する。 Next, a second embodiment of the present invention shown in FIGS. 6 and 7 will be described.
  この第２実施例では，バイパス弁１０のジョイント部材２６が嵌合する厚肉部１０ｂが，バイパス弁１０の全閉時でも，計量孔５ｂの上方にくるように配置され，この厚肉部１０ｂの外周面にダストトラップ用の凹溝３４が，バイパス弁１０の薄肉部１０ａの肉厚より深く環状に形成される。尚，前実施例におけるダストカバー３５は廃止される。その他の構成は，前実施例と同様であるので，図６及び図７中，前実施例と対応する部分には同一の参照符号を付して，重複する説明を省略する。 In the second embodiment, the thick portion 10b into which the joint member 26 of the bypass valve 10 is fitted is arranged so as to be above the measuring hole 5b even when the bypass valve 10 is fully closed. A concave groove 34 for dust trap is formed in an annular shape deeper than the thickness of the thin portion 10 a of the bypass valve 10 on the outer peripheral surface of the bypass valve 10. The dust cover 35 in the previous embodiment is abolished. Since the other configuration is the same as that of the previous embodiment, portions corresponding to those of the previous embodiment in FIG. 6 and FIG.
  この第２実施例によれば，環状で且つ深い凹溝３４をバイパス弁１０の外周面に形成することができ，バイパス弁１０の全周に亙り凹溝３４のダスト捕捉機能を高めることができる。 According to the second embodiment, the annular and deep groove 34 can be formed on the outer peripheral surface of the bypass valve 10, and the dust trapping function of the groove 34 can be enhanced over the entire periphery of the bypass valve 10. .
  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，凹溝３４を複数条，バイパス弁１０の軸線Ｙ方向に並べて配設することもできる。またスロットルボディ１をメインボディ１ａとサブボディ１ｂとに分割せず，スロットルボディ１全体を一体に形成することもできる。 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, a plurality of concave grooves 34 can be arranged in the direction of the axis Y of the bypass valve 10. Further, the throttle body 1 can be integrally formed without dividing the throttle body 1 into the main body 1a and the sub body 1b.

Claims (5)

  1. 　スロットル弁（３）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）に，スロットル弁（３）を迂回して吸気道（２）に接続されるバイパス（４）と，このバイパス（４）に介入するシリンダ状の弁孔（５）とを設け，この弁孔（５）には，軸方向の動きでバイパス（４）を開閉するピストン状のバイパス弁（１０）を摺動自在且つ回転不能に嵌装し，このバイパス弁（１０）と，スロットルボディ（１）に取り付けられるアクチュエータ（１７）の出力軸（１８）とをねじ機構（１９）を介して連結して，出力軸（１８）の回転によりバイパス弁（１０）を軸方向に開閉駆動するようにしたバイパス吸気量制御装置において，
      前記バイパス弁（１０）の外周面に，その周方向に延びるダストトラップ用の凹溝（３４）を設けたことを特徴とするバイパス吸気量制御装置。     A throttle body (1) having an intake passage (2) opened and closed by a throttle valve (3), a bypass (4) bypassing the throttle valve (3) and connected to the intake passage (2), and this bypass ( 4) is provided with a cylindrical valve hole (5) intervening in the piston hole bypass valve (10) that opens and closes the bypass (4) by axial movement. The bypass valve (10) and the output shaft (18) of the actuator (17) attached to the throttle body (1) are connected via a screw mechanism (19). In the bypass intake air amount control device configured to open and close the bypass valve (10) in the axial direction by the rotation of (18),
    A bypass intake air amount control device characterized in that a concave groove (34) for dust traps extending in the circumferential direction is provided on the outer peripheral surface of the bypass valve (10).
  2. 　請求項１記載のバイパス吸気量制御装置において，
    　前記弁孔（５）の内側面には，バイパス（４）の下流側に連なっていてバイパス弁（１０）の軸方向の移動で開閉される計量孔（５ｂ）が開口しており，バイパス弁（１０）の外周面上の前記凹溝（３４）を，その端部が前記計量孔（５ｂ）の手前で終わるよう円弧状に形成したことを特徴とするバイパス吸気量制御装置。     In the bypass intake air amount control device according to claim 1,
    On the inner surface of the valve hole (5), there is opened a measuring hole (5b) connected to the downstream side of the bypass (4) and opened and closed by the axial movement of the bypass valve (10). The bypass intake air amount control device according to (10), wherein the concave groove (34) on the outer peripheral surface is formed in an arc shape so that an end thereof ends in front of the measuring hole (5b).
  3. 　請求項１記載のバイパス吸気量制御装置において，
    　前記弁孔（５）の内側面には，バイパス（４）の下流側に連なっていてバイパス弁（１０）の軸方向の移動で開閉される計量孔（５ｂ）が開口しており，バイパス弁（１０）の，前記計量孔（５ｂ）より前記アクチュエータ（１７）側の外周面に前記凹溝（３４）を環状に設けたことを特徴とするバイパス吸気量制御装置。     In the bypass intake air amount control device according to claim 1,
    On the inner surface of the valve hole (5), there is opened a measuring hole (5b) connected to the downstream side of the bypass (4) and opened and closed by the axial movement of the bypass valve (10). The bypass intake air amount control device according to (10), wherein the concave groove (34) is provided in an annular shape on the outer peripheral surface on the actuator (17) side from the metering hole (5b).
  4. 　請求項１記載のバイパス吸気量制御装置において，
    　前記ねじ機構（１９）を，前記出力軸（１８）に連設されるねじ軸（１８ａ）と，このねじ軸（１８ａ）に螺合するねじ孔（２２ａ）を持った駆動部材（２２）とで構成し，この駆動部材（２２）を前記バイパス弁（１０）に連結するオルダムジョイント（２０）をバイパス弁（１０）の周壁の厚肉部（１０ｂ）内に配設し，その厚肉部（１０ｂ）の外周に前記凹溝（３４）を形成したことを特徴とするバイパス吸気量制御装置。     In the bypass intake air amount control device according to claim 1,
    The screw mechanism (19) includes a screw shaft (18a) connected to the output shaft (18), and a drive member (22) having a screw hole (22a) screwed into the screw shaft (18a). An Oldham joint (20) for connecting the drive member (22) to the bypass valve (10) is disposed in the thick wall portion (10b) of the peripheral wall of the bypass valve (10), and the thick wall portion A bypass intake air amount control device characterized in that the concave groove (34) is formed on the outer periphery of (10b).
  5. 　請求項１記載のバイパス吸気量制御装置において，
    　前記スロットルボディ（１）の使用状態では，バイパス弁（１０）は，その軸線（Ｙ）が上下方向に向かうように配置され，前記凹溝（３４）における，前記弁孔（５）の入口孔（５ａ）側の下側面を該入口孔（５ａ）側に傾斜した斜面（３４ｂ）で構成する一方，それと反対側の上側面を平坦面（３４ａ）で構成したことを特徴とするバイパス吸気量制御装置。     In the bypass intake air amount control device according to claim 1,
    When the throttle body (1) is in use, the bypass valve (10) is arranged so that its axis (Y) is directed in the vertical direction, and the inlet hole of the valve hole (5) in the concave groove (34). A bypass intake air amount characterized in that the lower side surface of (5a) side is constituted by a slope (34b) inclined to the inlet hole (5a) side, and the upper side surface on the opposite side is constituted by a flat surface (34a) Control device.
PCT/JP2009/071772 2009-01-13 2009-12-28 Device for controlling amount of bypassed intake air WO2010082446A1 (en)

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