JP2013164051A - Idling air amount adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idling air amount adjusting device capable of giving a fast idling air amount increased by a certain amount from an adjusted normal idling air amount.SOLUTION: An idling air amount adjusting device 40 includes a plunger 42 capable of push-pull operation and rotation operation, a valve member 64 which can change its position by the push-pull operation of the plunger 42 and can adjust its position by the rotation operation of the plunger 42. The valve member 64 opens a bypass passage 34 and can adjust an open area of the bypass passage 34 so that the idling air amount agrees with a normal idling air amount at a push position of an operation member, and opens the bypass passage 34 so that the air amount increased by a certain amount from the adjusted normal idling air amount agrees with a fast idling air amount at a pull position of the operation member.

Description

  The present invention relates to an apparatus for adjusting an idle air amount in a throttle device of an internal combustion engine (referred to as an engine) used for a vehicle such as a motorcycle, a moped bicycle, a buggy, a ship such as a motor boat, an agricultural machine such as a lawn mower or a cultivator. It is about.

As a conventional example of this type of idle air amount adjusting device, there is one described in Patent Document 1, for example. FIG. 22 is a sectional view showing the idle air amount adjusting device.
As shown in FIG. 22, in the idle air amount adjusting device, the opening area of the intake passage 511 is controlled to be opened and closed by the throttle valve 513, the intake passage 511 a upstream from the throttle valve 513, and the downstream side from the throttle valve 513. In the throttle body 510 that is connected to the intake passage 511b through the bypass passage 500B and is controlled to be opened and closed by the start valve 514 that is operated (push-pull operation) by the start wire 518, the axial center line of the start valve 514 A start adjusting rod 506 that adjusts the minimum opening of the start valve 514 is screwed to the throttle body 510 along the lower end of the start valve 514. During normal (warm-up) period, the idle air amount (referred to as “normal idle air amount”) is adjusted by screwing and screwing (turning operation) of the start adjusting rod 506. Further, at the time of low temperature start, the start valve 514 is moved upward by pulling (pulling) the start wire 518, and the bypass passage 500B is kept open for a certain amount, thereby switching to the fast idle air amount.

JP 2005-351191 A

  According to the conventional example, the fast idle air amount is constant regardless of the adjustment (increase / decrease) of the normal idle air amount by the start adjusting rod 506. There was a problem of shortage. For example, when foreign matter such as deposits adheres to the intake passage 511 or the throttle valve 513 and the normal idle air amount decreases, even if the decrease is increased by adjustment of the start adjustment rod 506, the amount corresponding to the increase is increased. The amount of fast idle air is not increased. For this reason, the amount of increase in the normal idle air amount, that is, the decrease due to foreign matter is insufficient as the fast idle air amount.

  The problem to be solved by the present invention is to provide an idle air amount adjusting device capable of obtaining a fast idle air amount increased by a fixed amount with reference to the adjusted normal idle air amount as a reference.

The above-mentioned problem can be solved by an idle air amount adjusting device having a configuration described in the claims.
According to the idle air amount adjusting device of the first aspect, the idle air amount adjusting device adjusts the idle air amount flowing through the bypass passage that bypasses the throttle valve, and is provided so as to be capable of push-pull operation and rotation operation. An operation member, and a valve member provided so that the position of the operation member can be changed in the axial direction by a push-pull operation of the operation member, and can be adjusted in the axial direction by rotating the operation member. The bypass passage is opened so that the idle air amount becomes the normal idle air amount at the push position of the operation member, and the opening area of the bypass passage can be adjusted by rotating the operation member. At the position, the air amount increased by a certain amount based on the adjusted normal idle air amount adjusted at the push position of the operating member Opening the bypass passage so that the fast idle air quantity. According to this configuration, the idle air amount can be switched between the normal idle air amount and the fast idle air amount by changing the position of the valve member by the push-pull operation of the operation member. Further, the normal idle air amount can be adjusted by adjusting the position of the valve member by rotating the operation member at the push position of the operation member. Further, at the pull position of the operation member, the valve member opens the bypass passage so that the air amount increased by a certain amount on the basis of the adjusted normal idle air amount becomes the fast idle air amount. Therefore, it is possible to obtain a fast idle air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. Thus, unlike the conventional example, even if the normal idle air amount is adjusted (increased or decreased), it is possible to prevent the fast idle air amount from being excessive or insufficient.

  According to the idle air amount adjusting device described in claim 2, the valve member is a valve member having a piston structure, and the valve member causes the normal idle air amount to flow through the bypass passage at the push position of the operation member, and the normal idle amount. A first passage in which the air amount can be adjusted, a second passage through which a fixed amount of idle air is increased in the bypass passage at the pull position of the operation member, and an air amount corresponding to the adjusted normal idle air amount. A third passage. According to this configuration, at the push position of the operation member, the normal idle air amount is allowed to flow through the bypass passage and the normal idle air amount can be adjusted, and at the pull position of the operation member, the idle passage is increased by a certain amount in the bypass passage. An idle air amount adjusting device including a valve member having a piston structure having a second passage for flowing an air amount and a third passage for flowing an air amount corresponding to the adjusted normal idle air amount can be configured.

  According to the idle air amount adjusting device described in claim 3, the valve member is formed with the inlet side opening of the first passage and the inlet side opening of the second passage at a predetermined interval. According to this configuration, air leakage from the bypass passage to the inlet side opening of the first passage can be prevented at the pull position of the operation member. For example, when the inlet opening of the first passage and the inlet opening of the second passage are formed adjacent to the valve member, the air from the bypass passage opens at the inlet side opening of the first passage at the pull position of the operation member. It is expected that the air will leak into the first passage, but such an air leakage can be prevented by forming the opening on the inlet side of the first passage and the opening on the inlet side of the second passage at a predetermined interval. can do.

  According to the idle air amount adjusting device described in claim 4, the valve member is a valve member having a needle structure, and the valve member is bypassed so that the normal idle air amount flows through the bypass passage at the push position of the operation member. The opening area of the bypass passage is defined so that the amount of fast idle air flows through the bypass passage at the first valve portion having a tapered shape capable of adjusting the opening area of the passage and the pull position of the operation member. And a tapered second valve portion. According to this configuration, at the push position of the operation member, the opening area of the bypass passage is defined so that the normal idle air amount flows through the bypass passage, and the tapered first valve portion capable of adjusting the opening area, and the operation member An idle air amount adjusting device including a needle-shaped valve member having a tapered second valve portion that defines an opening area of the bypass passage so that a fast idle air amount flows through the bypass passage at the pull position of be able to. Moreover, since the valve member has a needle structure, the structure can be simplified.

  According to the idle air amount adjusting device described in claim 5, the operation member includes an inner shaft member and an outer shaft member having an inner / outer double shaft structure, and the outer shaft member is positioned in the axial direction by a push-pull operation. A valve member that can be changed and that opens and closes the bypass passage; and an auxiliary passage that branches and merges so as to bypass the valve member with respect to the bypass passage. It has a valve member that can be adjusted in position in the direction and that opens and closes the auxiliary passage of the outer shaft member. According to this configuration, the valve member that can be changed in position in the axial direction by a push-pull operation, and that opens and closes the bypass passage, and the auxiliary passage that branches and merges so as to bypass the valve member with respect to the bypass passage are provided. An inner and outer double shaft structure operating member comprising an outer shaft member having an inner shaft member provided with a valve member that can be adjusted in the axial direction by a turning operation and that opens and closes an auxiliary passage of the outer shaft member. Can be configured.

It is a top view which shows the throttle apparatus concerning Embodiment 1. FIG. It is a front view which shows a throttle device. It is a right view which shows a throttle device. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. It is a front sectional view showing an idle air amount adjusting device. It is a disassembled perspective view which shows the component of an idle air quantity adjusting device. It is operation | movement explanatory drawing which shows a valve member in a fully closed state. It is operation | movement explanatory drawing which shows a valve member in a normal idle state. It is operation | movement explanatory drawing which shows a valve member in a fast idle state. It is a top view which shows the throttle apparatus concerning Embodiment 2. FIG. It is a front view which shows a throttle device. It is a front sectional view showing an idle air amount adjusting device. It is a disassembled perspective view which shows the component of an idle air quantity adjusting device. It is operation | movement explanatory drawing which shows the valve part of a plunger in a fully closed state. It is operation | movement explanatory drawing which shows the valve part of a plunger in a normal idle state. It is operation | movement explanatory drawing which shows the valve part of a plunger in a fast idle state. It is sectional drawing which shows the idle air quantity adjusting device concerning Embodiment 3 in a fully closed state. It is sectional drawing which shows an idle air quantity adjusting device in a normal idle state. It is sectional drawing which shows an idle air quantity adjusting device in a fast idle state. It is sectional drawing which shows the idle air quantity adjusting device concerning Embodiment 4. It is sectional drawing which shows the idle air quantity adjusting device concerning Embodiment 5. It is sectional drawing which shows the idle air quantity adjusting device concerning a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
Embodiment 1 will be described. In the present embodiment, for example, an idle air amount adjusting device provided in a throttle device of a motorcycle engine will be described. For convenience of explanation, the idle air amount adjusting device will be explained after explaining the throttle device. 1 is a plan view showing the throttle device, FIG. 2 is a front view of the same, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. For convenience of explanation, the top, bottom, left, and right of the throttle device and the idle air amount adjusting device are determined based on the front view of FIG.

  As shown in FIG. 1, the throttle device 10 includes a throttle body 12. The throttle body 12 is formed with a hollow cylindrical bore wall 13 extending in the vertical direction in FIG. As shown in FIG. 2, the hollow portion of the bore wall portion 13 is an intake passage 14. An air cleaner side conduit is connected to the upstream end (front end) of the bore wall 13, and an engine side conduit (for example, intake air) is connected to the downstream end (rear end) of the bore wall 13. Tube) is connected. Further, hollow cylindrical left and right bearing portions 15 are concentrically formed on both left and right side portions of the bore wall portion 13. Both bearing portions 15 support both ends of a throttle shaft 18 that traverses the intake passage 14 in the radial direction (left-right direction) in a rotatable manner. A butterfly throttle valve 19 for opening and closing the intake passage 14 is fixedly attached to the throttle shaft 18 by fastening or the like (see FIG. 4).

  A right end portion of the throttle shaft 18 protrudes rightward from the right bearing portion 15. A throttle lever 21 is integrally provided at the right end of the throttle shaft 18 (see FIG. 3). A wire hook 22 is provided on the throttle lever 21. In the present embodiment, the throttle lever 21 is formed by bending the end of the belt-like throttle shaft 18, and the wire hook 22 is formed by bending a part of the throttle lever 21. A disc-shaped wire guide 23 made of a resin molded product is provided at the right end of the throttle shaft 18. In the present embodiment, a square shaft insertion hole is formed at the center of the wire guide 23, and the throttle shaft 18 and the wire guide 23 are rotated together by inserting the throttle shaft 18 into the shaft insertion hole. It is assembled to be movable. In this way, the throttle shaft 18 is provided to rotate integrally with the rotation of the throttle lever 21 and the wire guide 23.

  The structure in which the throttle shaft 18 rotates integrally with the rotation of the throttle lever 21 and the wire guide 23 is not limited to the above-described structure, and can be changed as appropriate. For example, the throttle lever 21, the wire hook 22 and the wire guide 23 are formed as an integral part, and the integral part is engaged with the throttle shaft 18 via an engagement means (for example, a square hole and a square shaft), thereby In some cases, the integral part and the throttle shaft 18 are assembled so as to be integrally rotatable. Also, the wire hook 22 and the wire guide 23 are formed as an integral part, and the integral part and the throttle lever 21 and the throttle shaft 18 are integrated by fitting the integral part and the throttle lever 21 to the throttle shaft 18 respectively. In some cases, it can be pivotably assembled.

  A V-shaped groove 23a is formed on the outer periphery of the wire guide 23 (see FIG. 2). An accelerator wire (not shown) that is pushed and pulled in conjunction with the accelerator operation of the motorcycle is hooked on the groove 23a. A back spring 26 made of a torsion coil spring is interposed between the right bearing portion 15 and the throttle lever 21. The throttle lever 21 is always urged in the closing direction by the back spring 26. The right bearing portion 15 is formed with a bracket portion 24 that is attached to the vehicle body side by fastening or the like.

  The throttle lever 21 is opened together with the wire guide 23 through the accelerator wire (not shown) and against the bias of the back spring 26 by the accelerator operation of the motorcycle by the user (driver) (in FIG. 3). (Clockwise direction). The throttle valve 19 is opened together with the throttle shaft 18 by the rotation of the throttle lever 21 in the opening direction. Further, the opened throttle lever 21 is rotated in the closing direction together with the wire guide 23 by the bias of the back spring 26, whereby the throttle valve 19 is closed together with the throttle shaft 18. Thus, the amount of air flowing through the intake passage 14 is adjusted by opening and closing the throttle valve 19 based on the driver's accelerator operation. In the engine idle state, the throttle valve 19 is fully closed.

  A bypass passage forming portion 28 is formed on the upper surface side of the bore wall portion 13. The bypass passage forming portion 28 is formed in a horizontally long block shape corresponding to the upper side of the throttle valve 19 and extending in the left-right direction. The bypass passage forming portion 28 is formed with a bottomed cylindrical valve chamber 30 that opens at one end (for example, the left end). As shown in FIG. 4, the bypass passage forming portion 28 is formed with a pair of front and rear vertical holes 31 and 32 penetrating in the vertical direction with the valve chamber 30 therebetween. Both vertical holes 31 and 32 communicate with the front and rear end portions (left and right end portions in FIG. 4) of the valve chamber 30 in a crossing manner. The lower end opening of the front side (right side in FIG. 4) vertical hole 31 is opened in the upper end side wall surface of the intake passage 14 on the upstream side of the throttle valve 19. Further, the lower end opening of the vertical hole 32 on the rear side (left side in FIG. 4) is opened on the upper end side wall surface of the intake passage 14 on the downstream side of the throttle valve 19. In addition, plugs 31a and 32a for closing the openings are attached to the upper end openings of the vertical holes 31 and 32, respectively. The bypass passage forming portion 28 is formed with a bottomed horizontal hole 33 that opens at the front end (the right end in FIG. 4). The horizontal hole 33 communicates with the valve chamber 30 and the vertical holes 31 and 32 in a crossing manner. Further, a plug 33 a for closing the opening is attached to the front end opening of the horizontal hole 33. A bypass passage 34 is formed by the vertical holes 31 and 32 and the horizontal hole 33 so as to communicate in series through the valve chamber 30 and bypass the throttle valve 19. The front vertical hole 31 is the inlet 31 of the bypass passage 34 (same as the vertical hole 31), and the rear vertical hole 32 is the outlet 32 of the bypass passage 34 (same reference as the vertical hole 32). Attached). Further, the bypass passage forming unit 28 is provided with an idle air amount adjusting device 40 that adjusts the amount of air flowing through the bypass passage 34, that is, an idle air amount.

Next, the idle air amount adjusting device 40 will be described. FIG. 5 is a front sectional view showing the idle air amount adjusting device, and FIG. 6 is an exploded perspective view showing the same components.
As shown in FIG. 5, the idle air amount adjusting device 40 includes a plunger 42. The plunger 42 is formed in a shaft shape, and is disposed concentrically with respect to the inside of the valve chamber 30 of the bypass passage forming portion 28 so as to be movable in the axial direction. In the plunger 42, the insertion side (the right side in FIG. 5) into the valve chamber 30 is referred to as the distal end side or the inner end side, and the other end side (the left end side in FIG. 5) is referred to as the proximal end side or the outer end side. The outer end side of the plunger 42 protrudes outward (leftward) from the valve chamber 30. An annular plate-like knob 44 is fitted and fixedly attached to the outer end portion of the plunger 42. For example, the knob 44 is prevented from coming off by expanding the outer end of the plunger 42 by caulking. The knob 44 is operated by a user (driver) by a push-pull operation in the axial direction and a rotation operation in the direction around the axis. The plunger 42 corresponds to an “operation member” in this specification.

  A disc-shaped guide flange 46 having a large diameter is formed on the axial portion of the plunger 42 corresponding to the central portion in the axial direction in the valve chamber 30. The guide flange 46 is slidably fitted in the valve chamber 30 in the axial direction. An O-ring 47 that seals between the outer peripheral portion of the guide flange 46 and the peripheral wall surface 30 a of the valve chamber 30 is attached. The O-ring 47 prevents air leakage from the room on the bypass passage 34 side of the valve chamber 30 to the outside.

  A holder 50 is fixedly attached to the opening side end of the valve chamber 30. For example, the holder 50 is formed in a headed bolt shape and is fastened in the open end of the valve chamber 30. The holder 50 has a stepped hole-shaped hollow hole that penetrates concentrically in the axial direction and has a large-diameter hole on the valve chamber 30 side. A corresponding shaft-like portion of the plunger 42 is inserted into the hollow hole (specifically, the small-diameter hole) of the holder 50 so as to be movable in the axial direction and rotatable in the direction around the axis. A coil spring 52 is interposed between the opposed surfaces of the holder 50 and the plunger 42 (specifically, the guide flange 46) in a compressed state. The coil spring 52 is fitted on the plunger 42. Further, the end of the coil spring 52 on the holder 50 side is fitted in the large-diameter hole of the hollow hole of the holder 50. The coil spring 52 always urges the plunger 42 forward (rightward in FIG. 5). When the plunger 42 is in the push position (see the solid line 42 in FIG. 5), the distal end surface 42 a of the plunger 42 is brought into contact with the back wall surface 30 b of the valve chamber 30 by the bias of the coil spring 52.

  A cylindrical cylindrical portion 56 projects concentrically from the head of the holder 50. An annular mounting groove 56 a is formed on the outer peripheral surface of the base end portion of the cylindrical portion 56. A plurality of (for example, four) locking claws 58 arranged at equal intervals in the circumferential direction are formed on the outer end surface of the cylindrical portion 56 (see FIG. 6). A claw portion 58 a that protrudes inward in the radial direction is formed at the tip of each locking claw 58. The locking claw 58 is formed so that it can be elastically deformed in the direction of expanding the diameter of the claw portion 58a, so-called bending deformation.

  The plunger 42 is formed with an annular locking projection 60 corresponding to the claw portion 58 a of each locking claw 58 of the holder 50. The outer peripheral surface of the locking convex portion 60 is formed in a circular arc surface having a convex cross section. When the plunger 42 is in the push position (see the solid line 42 in FIG. 5), the locking projection 60 is positioned on the back side (right side in FIG. 5) from the claw portion 58a of each locking claw 58. Further, when the plunger 42 is in the pull position (see the two-dot chain line 42 in FIG. 5), the locking projection 60 is positioned outside (on the left side in FIG. 5) than the claw portion 58a of each locking claw 58. (See the two-dot chain line 60 in FIG. 5). Further, when the locking projection 60 is moved in the axial direction accompanying the push-pull operation of the plunger 42, the locking projection 60 abuts on the claw portion 58 a of each locking claw 58 and bends and deforms the locking claw 58 in the diameter increasing direction. The claw portion 58a passes through, and the locking claw 58 is elastically restored by the passage. Further, when the plunger 42 is in the pull position, the locking projection 60 abuts against the claw portion 58a of the locking claw 58 of the holder 50, whereby the tip of the plunger 42 by the coil spring 52 (rightward in FIG. 5). ) Is restricted (returned), and rattling of the plunger 42 is prevented. Further, when the plunger 42 is pulled, the opposing surfaces of the guide flange 46 and the holder 50 come into contact with each other, so that excessive pulling operation of the plunger 42 is restricted.

  A boot 62 is provided on the cylindrical portion 56 of the holder 50. The boot 62 is formed in a conical cylinder shape by a rubber-like elastic material. A mounting flange 62 a that protrudes radially inward is formed in the large-diameter end of the boot 62. The mounting flange 62a is mounted on the mounting groove 56a of the cylindrical portion 56 of the holder 50 using elastic deformation. A shaft-like portion between the knob 44 and the locking projection 60 of the plunger 42 is inserted into the small diameter side end of the boot 62 so as to be slidable in the axial direction and the direction around the axis. The boot 62 covers the peripheral portion of each locking claw 58 of the holder 50. Thereby, the foreign matter is prevented from being caught in the engaging portion between each locking claw 58 and the locking projection 60 during the push-pull operation and the rotation operation of the plunger 42.

  A valve member 64 having a piston structure is arranged in the valve chamber 30 so as to be movable in the axial direction. The valve member 64 includes an inner cylinder member 66 and an outer cylinder member 68 having an inner / outer double cylinder structure (see FIG. 6). The inner cylinder member 66 and the outer cylinder member 68 are integrated by, for example, press fitting. The valve member 64 constitutes a communication passage (described later) for selectively flowing idle air from the inlet 31 to the outlet 32 of the bypass passage 34 by integrating the inner cylinder member 66 and the outer cylinder member 68. Yes. The outer cylinder member 68 is fitted in the valve chamber 30 so as to be slidable in the axial direction (left-right direction in FIG. 5). Key means (not shown) for preventing the outer cylinder member 68 from rotating is provided between the outer cylinder member 68 and the peripheral wall portion of the valve chamber 30. Therefore, the valve member 64 can move only in the axial direction without rotating in the direction around the axis.

  The inner cylinder member 66 is connected to the distal end portion of the plunger 42 via a screw mechanism 70. The screw mechanism 70 includes a screw shaft 71 having a small-diameter shaft-like male screw formed at the distal end portion of the plunger 42, and a screw hole 72 having a screw formed on the inner cylinder member 66 and screwed to the screw shaft 71. Consists of. Therefore, the position of the valve member 64 can be changed in the axial direction by a push-pull operation of the plunger 42, and the position of the valve member 64 can be adjusted in the axial direction by a turning operation of the plunger 42. Further, an O-ring 74 that seals between the plunger 42 and the inner cylinder member 66 is interposed. Air leakage from the bypass passage 34 to the outside is prevented by the O-ring 74. The screw mechanism 70 corresponds to a “rotational linear motion conversion mechanism” in this specification.

  The plunger 42 is moved to a push position indicated by a solid line 42 in FIG. 5 and a pull position indicated by a two-dot chain line 42 in FIG. 5 by movement in the axial direction by a push-pull operation on the knob 44. At this time, the valve member 64 moves in the axial direction integrally with the plunger 42. Further, at the push position of the plunger 42, the valve member 64 is adjusted in the axial direction via the screw mechanism 70 by a turning operation around the axis with respect to the knob 44. The push position of the plunger 42 corresponds to the “normal idle position” in this specification. The pull position of the plunger 42 corresponds to the “fast idle position” in this specification. The plunger 42, the holder 50, the coil spring 52, and the valve member 64 constitute an “idle switching mechanism”. The plunger 42 and the valve member 64 constitute a “normal idle adjustment mechanism”.

Next, the communication passage of the valve member 64 will be described. FIG. 7 is an operation explanatory view showing the valve member in a fully closed state, FIG. 8 is an operation explanatory view showing the normal idle state, and FIG. 9 is an operation explanatory view showing the fast idle state. 7 to 9, the outline of the peripheral portion of the valve member 64 is shown in a plan sectional view. For convenience of explanation, the right end side of the valve member 64 is referred to as a distal end side, and the left end side of the valve member 64 is referred to as a proximal end side.
As shown in FIG. 7, a front passage groove 76 extending from the distal end surface side to the proximal end side is formed on the front side surface (lower side surface in FIG. 7) of the inner cylinder member 66 of the valve member 64. The end face of the front passage groove 76 is closed at the base end portion of the inner cylinder member 66, and the end face of the front passage groove 76 is opened at the distal end face of the inner cylinder member 66. A rear passage groove 78 extending from the distal end surface (right end surface) side to the proximal end side is formed on the rear side surface (upper side surface in FIG. 7) of the inner cylinder member 66. The end face of the rear passage groove 78 is closed at the base end portion of the inner cylinder member 66, and the end face of the rear passage groove 78 is opened at the front end face of the inner cylinder member 66.

  A first opening hole 80 penetrating in the radial direction is formed at a central portion in the axial direction on the front side surface (lower side surface in FIG. 7) of the outer cylindrical member 68 of the valve member 64. The first opening hole 80 communicates with a passage groove 76 on the front side of the inner cylinder member 66. Further, a bottomed cylindrical communication hole 82 extending toward the first opening hole 80 is formed at the radial center of the front portion (lower portion in FIG. 7) of the front end surface of the outer cylinder member 68. . Further, a second opening hole 84 is formed on the front side surface (lower side surface in FIG. 7) of the outer cylinder member 68 so as to be arranged at a predetermined interval on the right side of the first opening hole 80 (the front end side of the outer cylinder member 68). Has been. The second opening hole 84 communicates with the communication hole 82. Further, a third opening hole 86 is formed on the front side surface (lower side surface in FIG. 7) of the outer cylinder member 68 so as to be arranged at a predetermined interval on the right side of the second opening hole 84 (the front end side of the outer cylinder member 68). Has been. The third opening hole 86 communicates with the communication hole 82. The first opening 80 corresponds to the “first opening” in this specification. The second opening 84 corresponds to a “second opening” in this specification. The third opening hole 86 corresponds to a “third opening” in this specification.

  The first opening hole 80 and the third opening hole 86 are formed in the same shape. The first opening hole 80 and the third opening hole 86 are arranged at an interval corresponding to the movement stroke S <b> 1 (see FIG. 8) accompanying the push-pull operation of the plunger 42. Further, the second opening hole 84 is formed with an opening area corresponding to an increase necessary for the fast idle air amount with respect to the normal idle air amount (described later). Further, the first opening hole 80 and the second opening hole 84 are formed at a predetermined interval. Further, the second opening hole 84 is disposed closer to the third opening hole 86. The first opening hole 80 corresponds to “an opening on the inlet side of the first passage” in this specification. Further, the second opening hole 84 corresponds to “an opening on the inlet side of the second passage” in this specification. The third opening hole 86 corresponds to the “opening on the inlet side of the third passage” in this specification.

  A rear groove (upper portion in FIG. 7) of the outer cylinder member 68 is formed with a split groove-like communication groove 88 that penetrates in the radial direction and extends from the distal end surface side toward the proximal end side. The end face of the communication groove 88 is closed at the base end portion of the outer cylinder member 68, and the end face of the communication groove 88 is opened at the distal end face of the outer cylinder member 68. The communication groove 88 communicates with a passage groove 78 on the rear side of the inner cylinder member 66. A space 90 formed between the inner wall 30b of the valve chamber 30 and the facing surface of the valve member 64 includes a front passage groove 76 and a communication hole 82, and a rear passage groove 78 and a communication groove 88. Is a relay passage 90 (same as the space portion 90). The first opening hole 80, the second opening hole 84, the third opening hole 86, the communication hole 82, the front passage groove 76, the rear passage groove 78, and the communication groove 88 in the valve member 64, A “communication passage” is configured to selectively flow idle air from the inlet 31 toward the outlet 32.

  Immediately after the throttle body 12 having the idle air amount adjusting device 40 is mounted on the vehicle, the plunger 42 is placed in the push position, and the valve member 64 is the initial position on the far end side of the valve chamber 30, that is, the fully closed position. (See FIG. 7). In this state, the first opening hole 80, the second opening hole 84, and the third opening hole 86 of the valve member 64 are closed by the peripheral wall surface 30 a (specifically, the front wall surface portion) of the valve chamber 30. Is done. Therefore, the amount of idle air flowing through the bypass passage 34 is “0 (zero)”.

  Next, the rotation of the plunger 42 moves (retracts) the valve member 64 leftward in the axial direction via the screw mechanism 70 (see FIG. 8). Accordingly, the first opening hole 80 of the valve member 64 is opened with respect to the inlet 31 of the bypass passage 34. Further, the second opening hole 84 and the third opening hole 86 remain closed by the peripheral wall surface 30 a of the valve chamber 30. In this state, the air flowing from the inlet 31 of the bypass passage 34 flows to the outlet 32 through the first opening hole 80, the front passage groove 76, the relay passage 90, the rear passage groove 78 and the communication groove 88. (See arrow Y11 in FIG. 8). At this time, the passage (80, 76, 78, 88) of the valve member 64 through which air flows corresponds to the “first passage” in this specification. Further, the air flowing through the first passage corresponds to normal idle air, and the amount of air corresponds to the normal idle air amount.

  The normal idle air amount is adjusted to an appropriate amount by increasing / decreasing the opening area of the first opening hole 80 with respect to the inlet 31 by adjusting the position of the valve member 64 in the axial direction (advancing and retreating) by rotating the plunger 42. (Increase or decrease). The adjusted proper idle air amount corresponds to the “regulated normal idle air amount” in this specification. The inlet 31 and the first opening hole 80 constitute a “main metering unit” for metering the normal idle air amount. In the valve member 64, the adjustment range (movement range) from the opening start position to the opening end position of the first opening hole 80 with respect to the inlet 31 corresponds to the “normal idle adjustment region”. In FIG. 8, a solid line 64 indicates the valve member 64 in the push position (adjusted push position), and a two-dot chain line 64 indicates the valve member 64 in the pull position. Further, the movement stroke S1 accompanying the push-pull operation of the plunger 42 is constant regardless of the position adjustment of the valve member 64 at the push position.

  Next, the plunger 42 is moved to a pull position by a pulling operation with a movement stroke S1 (see FIG. 8) (see FIG. 9). As a result, the second opening hole 84 and the third opening hole 86 of the valve member 64 are opened with respect to the inlet 31 of the bypass passage 34. In addition, the second opening hole 84 of the second passage opens entirely with respect to the inlet 31. The first opening hole 80 is closed by the peripheral wall surface 30 a of the valve chamber 30. In this state, air flowing in from the inlet 31 of the bypass passage 34 passes through the second opening hole 84 and the third opening hole 86, and passes through the communication hole 82, the relay passage 90, the rear passage groove 78, and the communication groove 88. To the outlet 32 (see arrow Y12 in FIG. 9). At this time, the passage (82, 78, 88) including the second opening hole 84 of the valve member 64 through which air flows corresponds to the “second passage” in the present specification, and the passage (also including the third opening hole 86) ( 82, 78, 88) corresponds to the “third passage” in this specification. Further, the inlet 31 and the third opening hole 86 constitute a “sub-metering unit” that measures the air amount equal to the normal idle air amount.

  The total air flowing through the second passage (84, 82, 78, 88) and the third passage (86, 82, 78, 88) corresponds to fast idle air, and the total amount of air is the amount of fast idle air. It corresponds to. Further, the amount of air flowing through the second passage (84, 82, 78, 88) is an amount of air corresponding to an increase necessary for the fast idle air amount with respect to the adjusted normal idle air amount. Further, the amount of air flowing through the third passage (86, 82, 78, 88) is an amount of air corresponding to the adjusted normal idle air amount. That is, the 1st opening hole 80 and the 3rd opening hole 86 are arrange | positioned at intervals corresponding to the movement stroke S1 accompanying the push pull operation of the plunger 42, and are formed in the same shape. Therefore, the opening area of the third opening hole 86 with respect to the inlet 31 at the pull position (see FIG. 9) is the adjusted opening area of the first opening hole 80 with respect to the inlet 31 in the normal idle state adjusted at the push position (see FIG. 9). 8). Therefore, the amount of air flowing through the third passage is the same as the adjusted normal idle air amount. The amount of fast idle air is the sum of the amount of air corresponding to the amount of increase required for the amount of fast idle air and the amount of air corresponding to the amount of normal idle air after adjustment. The air amount is an air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount.

  Next, the operation of the idle air amount adjusting device 40 will be described. Now, it is assumed that the plunger 42 is in the push position (see FIG. 8). At this time, the idle air amount becomes the adjusted normal idle air amount. The normal idle air amount corresponds to the idle speed when the engine is warmed up. Prior to cold start of the engine, the user (driver) manually pulls the plunger 42 and moves to the pull position (see FIG. 9). As a result, the idle air amount becomes the fast idle air amount increased by a fixed amount with respect to the normal idle air amount. The amount of fast idle air corresponds to the idling speed at the time of cold start of the engine. Therefore, when the engine is started in the fast idle state, the engine speed becomes the fast idle speed. In addition, since the fast idle air amount is an air amount that is increased by a certain amount based on the normal idle air amount during normal idling (warming up), the engine speed during fast idling is also during idling (warming up). The engine rotation speed is increased by a certain rotation speed based on the idle rotation speed. Then, after the engine is warmed up, the user (driver) manually pushes the plunger 42 and moves to the push position, so that a normal idle state is established (see FIG. 8). Accordingly, the idle air amount is the normal idle air amount (the adjusted normal idle air amount), and the engine rotational speed is the idle rotational speed during normal idle.

  According to the idle air amount adjusting device 40 described above, the idle air amount can be switched between the normal idle air amount and the fast idle air amount by changing the position of the valve member 64 by the push-pull operation of the plunger 42. Further, at the push position of the plunger 42, the normal idle air amount can be adjusted by adjusting the position of the valve member 64 by rotating the plunger 42. Further, at the pull position of the plunger 42, the valve member 64 opens the bypass passage 34 so that the amount of air increased by a fixed amount based on the adjusted normal idle air amount becomes the fast idle air amount. Therefore, it is possible to obtain a fast idle air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. Thus, unlike the conventional example, even if the normal idle air amount is adjusted (increased or decreased), it is possible to prevent the fast idle air amount from being excessive or insufficient.

  Further, at the push position of the plunger 42 (see FIG. 8), the first idle passage (80, 76, 78, 88) that allows the normal idle air amount to flow and adjust the normal idle air amount through the bypass passage 34, and the plunger 42 In the pull position (refer to FIG. 9), the second passage (84, 82, 78, 88) for flowing a certain amount of idle air to the bypass passage 34 and the amount of air corresponding to the adjusted normal idle air amount are set. The idle air amount adjusting device 40 including the valve member 64 of the piston structure having the third passage (86, 82, 78, 88) to flow can be configured.

  Further, the valve member 64 has a predetermined interval between the first opening hole 80 of the first passage (80, 76, 78, 88) and the second opening hole 84 of the second passage (84, 82, 78, 88). They are separated. Therefore, air leakage from the bypass passage 34 to the first opening hole 80 of the first passage (80, 76, 78, 88) can be prevented at the pull position of the plunger 42. For example, when the first opening hole 80 and the second opening hole 84 are formed adjacent to the valve member 64, air from the bypass passage 34 flows from the first opening hole 80 to the first passage at the pull position of the plunger 42. (80, 76, 78, 88) is expected to leak, but by forming the first opening hole 80 and the second opening hole 84 at a predetermined interval, such air leakage is prevented. can do.

[Embodiment 2]
A second embodiment will be described. In the present embodiment, the bypass passage forming portion 28 and the idle air amount adjusting device 40 of the throttle device 10 according to the first embodiment are changed, and therefore, the changed portions will be described and redundant description will be omitted. 10 is a plan view showing the throttle device, FIG. 11 is a front view of the same, FIG. 12 is a front sectional view showing the idle air amount adjusting device, and FIG. 13 is an exploded perspective view showing the same components.
As shown in FIG. 11, a bypass passage forming portion 100 is formed on the upper surface side of the bore wall portion 13 of the throttle body 12 of the throttle device 10. The bypass passage forming portion 100 is formed in a horizontally long shape corresponding to the upper side of the throttle valve 19 and extending in the left-right direction. The bypass passage forming portion 100 is formed with a bottomed cylindrical valve chamber 102 that opens at one end (for example, the left end). The valve chamber 102 is formed in a stepped cylindrical shape in which the hole diameter is increased stepwise from the back side (right side in FIG. 12) toward the opening side (same left side). Yes.

  As shown in FIG. 11, the bypass passage forming portion 100 is formed with an inclined hole 103 that penetrates the end on the back side of the valve chamber 102 so as to cross in the vertical direction and in an inclined manner. The lower end opening of the inclined hole 103 is opened in the upper end side wall surface of the intake passage 14 upstream of the throttle valve 19. Further, the upper end portion of the inclined hole 103 is formed in a celestial shape. In addition, as shown in FIG. 11, the bypass passage forming portion 100 is formed with a vertical hole 104 that penetrates the central portion of the second-stage hole portion from the back side of the valve chamber 102 in the vertical direction. (See FIG. 12). The lower end opening of the vertical hole 104 is opened in the upper end side wall surface of the intake passage 14 on the downstream side of the throttle valve 19. A plug 104a for closing the opening is attached to the upper end opening of the vertical hole 104 (see FIG. 10). As shown in FIG. 12, a bypass passage 106 that communicates in a series with the inclined hole 103 and the vertical hole 104 through the valve chamber 102 and bypasses the throttle valve 19 is formed. The inclined hole 103 is the inlet 103 (same reference numeral) of the bypass passage 106, and the vertical hole 104 is the outlet 104 (same reference numeral) of the bypass passage 106. Further, the bypass passage forming unit 100 is provided with an idle air amount adjusting device 110 that adjusts an amount of air flowing through the bypass passage 106, that is, an idle air amount.

  Next, the idle air amount adjusting device 110 will be described. As shown in FIG. 12, the idle air amount adjusting device 110 includes a plunger 112. The plunger 112 is formed in a hollow shaft shape, and is arranged concentrically with respect to the inside of the valve chamber 102 of the bypass passage forming portion 100 and movable in the axial direction. In the plunger 112, the insertion side (the right side in FIG. 12) into the valve chamber 102 is referred to as the distal end side or the inner end side, and the other end side (the left end side in FIG. 12) is referred to as the proximal end side or the outer end side. The outer end side of the plunger 112 protrudes outward (leftward) from the valve chamber 102. A knob portion 114 is formed at the outer end portion of the plunger 112 so as to expand in an annular plate shape. The knob 114 is operated by a user (driver) by a push-pull operation in the axial direction and a rotation operation in the direction around the axis. The hollow portion of the plunger 112 is formed in a hollow conical shape that gradually decreases in inner diameter from the proximal end side toward the distal end side. The plunger 112 corresponds to an “operation member” in this specification.

  The plunger 112 is formed in a multi-stage shaft shape that gradually decreases in outer diameter from the knob portion 114 side toward the distal end side (the right end side). In addition, a needle portion valve portion 116 (described later) that is solid and tapered is extended concentrically at the distal end portion (right end portion in FIG. 12) of the plunger 112. A hollow cylindrical guide tube 118 is fitted on the outer end side of the plunger 112 in a double shaft shape. The guide cylinder 118 is connected to the plunger 112 via a screw mechanism 120. The screw mechanism 120 includes a male screw part 121 formed on the plunger 112 and a screw part 122 formed on the guide cylinder 118 and screwed to the male screw part 121. The screw mechanism 120 corresponds to a “rotational linear motion conversion mechanism” in this specification.

  One end of a hollow cylindrical holder 124 is fitted and fixedly attached to the opening side end of the valve chamber 102. A flange 125 is formed on the outer peripheral surface of the holder 124 so as to be in contact with the opening side end surface of the valve chamber 102. Further, the opposite side of the valve chamber 102 in the holder 124 is formed in a stepped cylindrical shape that gradually decreases the hole diameter and the outer diameter. The guide tube 118 is inserted into the hollow hole of the holder 124 so as to be movable in the axial direction. Although not shown, key means for preventing the guide tube 118 from rotating relative to the holder 124 is provided between the guide tube 118 and the holder 124. Therefore, the guide cylinder 118 is movable only in the axial direction without rotating in the direction around the axis. Further, the position of the valve portion 116 of the plunger 112 can be changed in the axial direction by a push-pull operation of the plunger 112, and the position of the valve portion 116 can be adjusted in the axial direction via the screw mechanism 120 by the turning operation of the plunger 112. ing.

  A flange 127 that increases the outer diameter is formed at the insertion side end of the guide tube 118 (the right end in FIG. 12). A coil spring 129 is interposed between the flange 127 of the guide tube 118 and the opposed surface of the holder 124 in a compressed state. The coil spring 129 is disposed in an annular space between the guide cylinder 118 and the holder 124. The coil spring 129 always urges the plunger 112 together with the guide cylinder 118 forward (to the right in FIG. 12). When the plunger 112 is in the push position (see the solid line 112 in FIG. 12), the end surface on the flange 127 side of the guide cylinder 118 is brought into contact with the stepped surface 102 a of the valve chamber 102 by the biasing force of the coil spring 129. An annular mounting groove 124 a is formed on the outer peripheral surface of the cylindrical portion exposed to the outside of the holder 124. A plurality (for example, four) of locking claws 131 arranged at equal intervals in the circumferential direction are formed on the outer end surface of the cylindrical portion (see FIG. 13). A claw portion 131 a that protrudes inward in the radial direction is formed at the tip of each locking claw 131. The locking claw 131 is formed so as to be elastically deformed in the direction of expanding the diameter of the claw portion 131a, so-called bending deformation.

  The guide cylinder 118 is formed with an annular locking projection 133 corresponding to the claw 131 a of each locking claw 131 of the holder 124. The outer peripheral surface of the locking projection 133 is formed in an arcuate surface having a convex cross section. When the plunger 112 is in the push position (see the solid line 112 in FIG. 12), the locking projection 133 is positioned on the back side (right side in FIG. 12) from the claw portion 131a of each locking claw 131. Further, when the plunger 112 is in the pull position (see the two-dot chain line 112 in FIG. 12), the locking projection 60 is positioned outside (on the left side in FIG. 12) than the claw portion 131a of each locking claw 131. . Further, when the locking projection 133 moves in the axial direction in accordance with the push-pull operation of the plunger 112, the locking projection 133 abuts on the claw portion 131 a of each locking claw 131 and flexes and deforms the locking claw 131 in the diameter increasing direction. Passing through the claw portion 131a, the locking claw 131 is elastically restored by the passage. When the plunger 112 is in the pull position (see the two-dot chain line 112 in FIG. 12), the locking projection 133 abuts against the claw 131 a of the locking claw 131 of the holder 124, thereby causing the coil spring 129. The movement (return) of the plunger 112 forward (to the right in FIG. 12) due to is restricted, and rattling of the plunger 112 is prevented. Further, when the plunger 112 is pulled, the opposing surfaces of the guide cylinder 118 and the holder 124 come into contact with each other, so that an excessive pulling operation of the plunger 112 is restricted.

  A boot 135 is provided on the cylindrical portion exposed to the outside of the holder 124. The boot 135 is formed in a conical cylinder shape by a rubber-like elastic material. A mounting flange 135 a that protrudes radially inward is formed in the large-diameter end of the boot 135. The mounting flange 135a is attached to the mounting groove 124a of the holder 124 using elastic deformation. A shaft-like portion between the knob portion 114 and the locking convex portion 133 of the plunger 112 is inserted into the small-diameter side end portion of the boot 135 so as to be slidable in the axial direction and the direction around the axis. The boot 135 covers the peripheral portion of each locking claw 131 of the holder 124. Thereby, the foreign matter is prevented from being caught in the engaging portion between the locking projection 133 and each locking claw 131 during the push-pull operation and the rotation operation of the plunger 112. Further, an O-ring 137 that seals between the plunger 112 and the retainer 138 that prevents the O-ring 137 from coming off is fixed to the inner peripheral corner of the stepped surface 102 a of the valve chamber 102. Is installed. O-ring 137 prevents air leakage from the inside of the valve chamber 102 bypass passage 106 side to the outside.

  The plunger 112 is moved to a push position indicated by a solid line 112 in FIG. 12 and a pull position indicated by a two-dot chain line 112 in FIG. 12 by movement in the axial direction by a push-pull operation with respect to the knob portion 114. Further, at the push position of the plunger 112, the plunger 112 is axially adjusted with respect to the guide cylinder 118 via the screw mechanism 120 by a rotation operation in the direction around the axis with respect to the knob portion 114. The push position of the plunger 112 corresponds to the “normal idle position” in this specification. The pull position of the plunger 112 corresponds to the “fast idle position” in this specification. The plunger 112, the guide cylinder 118, the holder 124, and the coil spring 129 constitute an “idle switching mechanism”. The plunger 112, the guide tube 118, and the holder 124 constitute a “normal idle adjustment mechanism”.

Next, the valve part 116 of the plunger 112 will be described. 14 is an operation explanatory view showing the valve portion of the plunger in the fully closed state, FIG. 15 is an operation explanatory view showing the normal idle state, and FIG. 16 is an operation explanatory view showing the fast idle state. 14-16, the outline of the periphery of the valve part 116 is represented by a front sectional view. For convenience of explanation, the right end side of the valve portion 116 is referred to as a distal end side, and the left end side of the valve member 64 is referred to as a proximal end side.
As shown in FIG. 14, the valve portion 116 of the plunger 112 has a multi-step taper shape including a first taper portion 141, an intermediate taper portion 142, and a second taper portion 143 that gradually decrease in diameter from the base end side toward the tip end side. Is formed. A straight tip shaft portion 144 is formed concentrically at the tip portion (the right end portion in FIG. 14) of the second taper portion 143. Further, a stepped hole-shaped valve seat portion 146 corresponding to the valve portion 116 is formed in the valve chamber 102. The valve portion 116 corresponds to a “valve member” in the present specification.

  The large diameter side end (base end side end) of the first taper portion 141 is formed with an outer diameter larger than the inner diameter (hole diameter) of the valve seat portion 146. The first taper portion 141 opens and closes the valve seat portion 146 of the valve chamber 102 and adjusts the opening area in the valve seat portion 146 by movement in the axial direction. That is, the first taper portion 141 fully closes the valve seat portion 146 by contacting the valve seat portion 146 over the entire circumference (see FIG. 14), and the valve seat portion 146 by moving away from the valve seat portion 146. The portion 146 is opened (see FIG. 15), and the opening area is changed by changing the position with respect to the valve seat portion 146. The opening area in the valve seat portion 146 corresponds to the opening area between the first taper portion 141 and the valve seat portion 146. Further, the air flowing through the opening between the first taper portion 141 and the valve seat portion 146 corresponds to normal idle air, and the air amount corresponds to the normal idle air amount (described later). Further, the period from the fully closed position of the first taper part 141 to the valve seat part 146 to the tip (small diameter end) corresponds to the normal idle adjustment region R1.

  The intermediate taper portion 142 smoothly continues the first taper portion 141 and the second taper portion 143. A portion from the base end (large diameter end) to the tip end (small diameter end) of the intermediate taper portion 142 corresponds to the flow rate change region R2.

  The second taper portion 143 adjusts the opening area in the valve seat portion 146 of the valve chamber 102 by movement in the axial direction (see FIG. 16). The opening area in the valve seat portion 146 corresponds to the opening area between the second taper portion 143 and the valve seat portion 146. Further, the air flowing through the opening between the second taper portion 143 and the valve seat portion 146 corresponds to fast idle air, and the air amount corresponds to a fast idle air amount (described later). The second taper portion 143 defines a fast idle air amount obtained by adding a certain amount of increase to an air amount equal to the normal idle air amount (an air amount corresponding to the normal idle air amount). Further, the portion from the fully closed position of the second taper portion 143 to the valve seat portion 146 to the tip (small diameter end) corresponds to the fast idle adjustment region R3 (see FIG. 14). The fast idle adjustment area R3 may be set by an area equal to or greater than the normal idle adjustment area R1.

  Further, the first taper portion 141 and the second taper portion 143 are arranged at an interval corresponding to the movement stroke S2 (see FIG. 15) accompanying the push-pull operation of the plunger 112. In addition, the second taper portion 143 has an opening area between the first taper portion 141 and the valve seat portion 146 at the push position at a position away from the first taper portion 141 with the moving stroke S2. Is formed so as to have an opening area obtained by adding an opening area corresponding to an increase necessary for the amount of fast idle air to an amount of normal idle air. Further, the first taper portion 141 and the second taper portion 143 have the same change in cross-sectional area. The first taper portion 141 corresponds to the “first valve portion” in this specification. The second taper portion 143 corresponds to a “second valve portion” in this specification.

  Immediately after the throttle body 12 having the idle air amount adjusting device 110 is mounted on the vehicle, the plunger 112 is placed in the push position, and the valve portion 116 is placed in the fully closed position, that is, the initial position (see FIG. 14). . In the normal idle state, the valve seat part 146 of the valve chamber 102 is closed by the first taper part 141 of the valve part 116. At this time, the amount of idle air flowing through the bypass passage 106 is “0 (zero)”.

  Next, the valve portion 116 is moved (retracted) to the left in the axial direction via the screw mechanism 120 (see FIG. 12) by the turning operation of the plunger 112. Thereby, as shown in FIG. 15, the valve seat part 146 is opened. Further, the air flowing in from the inlet 103 of the bypass passage 106 flows to the outlet 104 through a passage portion including an opening between the valve seat portion 146 and the first taper portion 141 of the valve chamber 102 (in FIG. 15, (See arrow Y21). The amount of air normally corresponds to the amount of idle air. In addition, the normal idle air amount is adjusted by increasing or decreasing the opening area in the valve seat portion 146 by adjusting the position of the first taper portion 141 of the valve portion 116 in the axial direction (advancing and retreating) by rotating the plunger 112. It can be adjusted (increased or decreased) to an appropriate amount. The adjusted proper idle air amount corresponds to the “regulated normal idle air amount” in this specification. The first taper part 141 and the valve seat part 146 constitute a “normal idle metering part” that meters the normal idle air amount. In FIG. 15, a solid line 112 indicates the plunger 112 in the push position (adjusted push position), and a two-dot chain line 112 indicates the plunger 112 in the pull position. Further, the movement stroke S2 accompanying the push-pull operation of the plunger 112 is constant regardless of the position adjustment of the plunger 112 at the push position.

  Next, by pulling the plunger 112, the valve portion 116 is moved to the pull position with a predetermined movement stroke S2 (see FIG. 15) (see FIG. 16). Thereby, the 2nd taper part 143 of the valve part 116 respond | corresponds with respect to the valve seat part 146. FIG. Further, air flowing in from the inlet 103 of the bypass passage 106 flows to the outlet 104 through a passage portion including an opening between the valve seat portion 146 and the second taper portion 143 of the valve chamber 102 (in FIG. 16, (See arrow Y22). The amount of air corresponds to the amount of fast idle air. The amount of fast idle air is the sum of the amount of air corresponding to the amount of increase required for the amount of fast idle air and the amount of air corresponding to the amount of normal idle air after adjustment. The amount of air. That is, the fast idle air amount is an air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. The second taper part 143 and the valve seat part 146 constitute a “fast idle metering part” for metering the amount of fast idle air.

  Next, the operation of the idle air amount adjusting device 110 will be described. Now, it is assumed that the plunger 112 is in the push position (see FIG. 15). At this time, the idle air amount becomes the adjusted normal idle air amount. The normal idle air amount corresponds to the idle speed when the engine is warmed up. Prior to cold start of the engine, the user (driver) manually pulls the plunger 112 and moves to the pull position (see FIG. 16). As a result, the idle air amount becomes the fast idle air amount increased by a fixed amount with respect to the normal idle air amount. The amount of fast idle air corresponds to the idling speed at the time of cold start of the engine. Therefore, when the engine is started in the fast idle state, the engine speed becomes the fast idle speed. In addition, since the fast idle air amount is an air amount that is increased by a certain amount based on the normal idle air amount during normal idling (warming up), the engine speed during fast idling is also during idling (warming up). The engine rotation speed is increased by a certain rotation speed based on the idle rotation speed. Then, after the engine is warmed up, the user (driver) manually pushes the plunger 112 and moves to the push position, so that a normal idle state is established (see FIG. 15). Accordingly, the idle air amount is the normal idle air amount (the adjusted normal idle air amount), and the engine rotational speed is the idle rotational speed during normal idle.

  According to the idle air amount adjusting device 110 described above, the idle air amount can be switched between the normal idle air amount and the fast idle air amount by changing the position of the valve portion 116 by the push-pull operation of the plunger 112. Further, at the push position of the plunger 112, the normal idle air amount can be adjusted by adjusting the position of the valve portion 116 by the turning operation of the plunger 112. Further, at the pulling position of the plunger 112, the valve portion 116 opens the bypass passage 106 so that the air amount increased by a fixed amount based on the adjusted normal idle air amount becomes the fast idle air amount. Therefore, it is possible to obtain a fast idle air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. Thus, unlike the conventional example, even if the normal idle air amount is adjusted (increased or decreased), it is possible to prevent the fast idle air amount from being excessive or insufficient.

  Further, at the push position of the plunger 112, the opening area of the bypass passage 106 is defined so that the normal idle air amount flows through the bypass passage 106, and the tapered first taper portion 141 capable of adjusting the opening area, and the plunger 112 The idle air amount adjustment includes a needle-shaped valve portion 116 having a tapered second taper portion 143 that defines an opening area of the bypass passage 106 so that a fast idle air amount flows through the bypass passage 106 at the pull position of The device 110 can be configured. Moreover, since the valve part 116 has a needle structure, the structure can be simplified.

[Embodiment 3]
A third embodiment will be described. Since the present embodiment is a modification of the second embodiment, the changed portion will be described and redundant description will be omitted. In addition, the same reference numerals are given to portions that are considered to be the same as or substantially the same as those in the second embodiment, and redundant descriptions are omitted. FIG. 17 is a cross-sectional view showing the idle air amount adjusting device in a fully closed state, FIG. 18 is a cross-sectional view showing the normal idle state, and FIG. 19 is a cross-sectional view showing the fast idle state.
As shown in FIG. 17, the idle air amount adjusting device (denoted with reference numeral 150) of the present embodiment is the same as the plunger 112 in the idle air amount adjusting device 110 of the second embodiment (see FIG. 12). The plunger is changed to a plunger (reference numeral 152) having an inner shaft member 153 and an outer shaft member 154 that form a structure. That is, the outer shaft member 154 is fitted on the inner shaft member 153 in a double shaft shape. The inner shaft member 153 and the outer shaft member 154 are connected via a screw mechanism 156. The screw mechanism 156 includes a male screw portion 157 formed on the inner shaft member 153 and a screw portion 158 formed on the outer shaft member 154 and screwed to the male screw portion 157. The screw mechanism 156 corresponds to a “rotational linear motion conversion mechanism” in this specification.

  For example, a minus (−) type tool engagement groove 160 is formed at the base end portion (left end portion in FIG. 17) of the inner shaft member 153. The tool engagement groove 160 can engage a screwdriver tool (not shown) such as a flathead screwdriver for rotating the inner shaft member 153 in the direction around the axis. Although not shown, key means for preventing the outer shaft member 154 from rotating with respect to the holder 124 is provided between the outer shaft member 154 and the holder 124. Therefore, the outer shaft member 154 is movable only in the axial direction without rotating in the direction around the axis. An annular plate-like knob 162 is fixedly attached to the base end portion (left end portion) of the outer shaft member 154. The knob 162 is push-pull operated by the user (driver). The inner shaft member 153 and the outer shaft member 154 of the plunger 152 correspond to “operation members” in the present specification.

  On the outer peripheral surface of the outer shaft member 154, a flange 127 and a locking projection 133 on the outer peripheral surface of the guide tube 118 (see FIG. 12) in the second embodiment are formed. The outer shaft member 154 is formed in a bottomed cylindrical shape that closes the tip opening. A valve portion 164 corresponding to the valve seat portion 146 of the valve chamber 102 is formed on the outer peripheral surface of the distal end portion of the outer shaft member 154. Further, a valve hole 166 is formed concentrically on the distal end surface of the outer shaft member 154 so as to penetrate the inside and outside of the hollow portion in the axial direction. A hole edge portion of the valve hole 166 is a valve seat portion 167. Further, a valve portion 170 corresponding to the valve seat portion 167 of the outer shaft member 154 extends concentrically at the distal end portion (right end portion in FIG. 17) of the inner shaft member 153. For convenience of explanation, the valve seat portion 146 is referred to as a first valve seat portion 146, and the valve portion 164 is referred to as a first valve portion 164. The valve seat portion 167 is referred to as a second valve seat portion 167, and the valve portion 170 is referred to as a second valve portion 170. The first valve unit 164 and the second valve unit 170 will be described later.

  An opening hole 172 that penetrates the inside and outside of the hollow portion in the radial direction is formed at the distal end portion of the outer shaft member 154. An auxiliary passage 173 is formed by a hollow portion including the valve hole 166 and the opening hole 172 of the outer shaft member 154. The auxiliary passage 173 branches and merges so as to bypass the first valve portion 164 with respect to the bypass passage 106. Further, an O-ring 174 that seals between the inner shaft member 153 and the outer shaft member 154 is interposed. Air leakage from the bypass passage 106 is prevented by the O-ring.

  The outer shaft member 154 is moved to a push position indicated by a solid line 154 in FIG. 17 and a pull position indicated by a two-dot chain line 154 in FIG. 17 by movement in the axial direction by a push-pull operation with respect to the knob 162. At this time, the position of the inner shaft member 153 is also changed together with the outer shaft member 154. Further, at the push position of the outer shaft member 154, the inner shaft member 153 is pivoted with respect to the outer shaft member 154 via the screw mechanism 156 by the rotation operation of the inner shaft member 153 around the axis with respect to the tool engagement groove 160. The position is adjusted in the direction. Further, the push position of the outer shaft member 154 corresponds to a “normal idle position”. The pull position of the outer shaft member 154 corresponds to a “fast idle position”. The inner shaft member 153, the outer shaft member 154, the holder 124, and the coil spring 129 constitute an “idle switching mechanism”. The inner shaft member 153, the outer shaft member 154, and the holder 124 constitute a “normal idle adjustment mechanism”.

Next, the first valve portion 164 of the outer shaft member 154 and the second valve portion 170 of the inner shaft member 153 will be described.
As shown in FIG. 17, the first valve portion 164 of the outer shaft member 154 is formed in a tapered shape that gradually decreases in diameter from the proximal end side toward the distal end side. The first valve part 164 opens and closes the first valve seat part 146 of the valve chamber 102 by movement in the axial direction. That is, the first valve part 164 fully closes the first valve seat part 146 by contacting the first valve seat part 146 over the entire circumference, and has a moving stroke S2 from the first valve seat part 146. The 1st valve seat part 146 is opened by separating (refer FIG. 19). The opening area between the first valve portion 164 and the first valve seat portion 146 at this time corresponds to an opening area corresponding to an increase necessary for the fast idle air amount with respect to the normal idle air amount. The first valve portion 164 corresponds to a “valve member” in the present specification.

  As shown in FIG. 17, the second valve portion 170 of the inner shaft member 153 is formed in a tapered shape having a gradually decreasing diameter from the proximal end side toward the distal end side. The large diameter side end (base end side end) of the second valve portion 170 is formed with an outer diameter larger than the inner diameter of the second valve seat portion 167 of the outer shaft member 154. The second valve portion 170 opens and closes the second valve seat portion 167 and adjusts the opening area in the second valve seat portion 167 by movement in the axial direction. That is, the 2nd valve part 170 fully closes this 2nd valve seat part 167 by contact | abutting over the perimeter to the 2nd valve seat part 167 (refer FIG. 17). Further, the second valve portion 170 opens the second valve seat portion 167 by separating from the second valve seat portion 167, and changes its opening area by changing the position with respect to the second valve seat portion 167 (see FIG. 18). ). The opening area in the second valve seat portion 167 corresponds to the opening area between the second valve portion 170 and the second valve seat portion 167. Further, the air flowing through the opening between the second valve portion 170 and the second valve seat portion 167 corresponds to normal idle air, and the air amount corresponds to the normal idle air amount. Further, the interval from the fully closed position of the second valve portion 170 to the tip (small diameter end) with respect to the second valve seat portion 167 corresponds to the “normal idle adjustment region”. The second valve portion 170 corresponds to a “valve member” in the present specification.

  Immediately after the throttle body 12 having the idle air amount adjusting device 150 is mounted on the vehicle, the outer shaft member 154 of the plunger 152 is placed in the push position, and the second valve portion of the inner shaft member 153 of the plunger 152 is placed. 170 is placed in the fully closed position, that is, the initial position (see FIG. 17). In the normal idle state, the first valve seat portion 146 of the valve chamber 102 is closed by the first valve portion 164 of the outer shaft member 154. At the same time, the second valve seat portion 167 of the outer shaft member 154 is closed by the second valve portion 170 of the inner shaft member 153. At this time, the amount of idle air flowing through the bypass passage 106 is “0 (zero)”.

  Next, by rotating the inner shaft member 153, the second valve portion 170 is moved (retracted) to the left in the axial direction while being rotated around the axis via the screw mechanism 156. Thereby, as shown in FIG. 18, the 2nd valve seat part 167 is opened. Further, the air flowing in from the inlet 103 of the bypass passage 106 flows to the outlet 104 via the auxiliary passage 173 of the outer shaft member 154 including the opening between the second valve seat portion 167 and the second valve portion 170 ( (See arrow Y31 in FIG. 18). The amount of air normally corresponds to the amount of idle air. Further, the normal idle air amount can be increased or decreased by increasing or decreasing the opening area in the second valve seat portion 167 by adjusting the position of the second valve portion 170 in the axial direction (advancing and retreating) by rotating the inner shaft member 153. It can be adjusted (increased or decreased) to an appropriate amount. The adjusted proper idle air amount corresponds to the “regulated normal idle air amount” in this specification. The second valve unit 170 and the second valve seat unit 167 constitute a “normal idle metering unit” that meters the normal idle air amount.

  Next, by pulling the outer shaft member 154 of the plunger 152, the first valve portion 164 is moved to the pull position with a predetermined movement stroke S2 (see FIG. 17). Thereby, as shown in FIG. 19, the 1st valve seat part 146 is opened. That is, the first valve portion 164 and the first valve seat portion 146 are opened with an opening area corresponding to an increase necessary for the fast idle air amount with respect to the normal idle air amount. In addition, air flowing in from the inlet 103 of the bypass passage 106 (see arrow Y32 in FIG. 19) passes through the passage portion including the opening between the first valve portion 164 and the first valve seat portion 146 to the outlet 104. (See arrow Y32a in the figure) and flows to the outlet 104 through the auxiliary passage 173 of the outer shaft member 154 including the opening between the second valve seat portion 167 and the second valve portion 170 (same as in FIG. (See arrow Y32b in the figure). Thus, the total amount of air passing through the passage portion including the opening between the first valve portion 164 and the first valve seat portion 146 is necessary for the fast idle air amount with respect to the adjusted normal idle air amount. This is the amount of air corresponding to the increased amount. Further, the amount of air flowing through the auxiliary passage 173 is the amount of air corresponding to the normal idle air amount. Therefore, in this state, the amount of air flowing through the bypass passage 106, that is, the amount of fast idle air, is equal to the amount of increase required for the amount of fast idle air relative to the amount of normal idle air, and the amount of normal idle air after adjustment. Is the total amount of air corresponding to. That is, the fast idle air amount is an air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. It should be noted that the first valve portion 164 and the first valve seat portion 146 measure the amount of air corresponding to the increased amount required for the fast idle air amount with respect to the adjusted normal idle air amount. Is configured.

  Next, the operation of the idle air amount adjusting device 150 will be described. Now, the plunger 152 (the inner shaft member 153 and the outer shaft member 154) is assumed to be in the push position (see FIG. 18). At this time, the idle air amount becomes the adjusted normal idle air amount. The normal idle air amount corresponds to the idle speed when the engine is warmed up. Prior to the cold start of the engine, the user (driver) manually pulls the outer shaft member 154 of the plunger 112 and moves the plunger 152 (the inner shaft member 153 and the outer shaft member 154) to the pull position ( (See FIG. 19). As a result, the idle air amount becomes the fast idle air amount increased by a fixed amount with respect to the normal idle air amount. The amount of fast idle air corresponds to the idling speed at the time of cold start of the engine. Therefore, when the engine is started in the fast idle state, the engine speed becomes the fast idle speed. In addition, since the fast idle air amount is an air amount that is increased by a certain amount based on the normal idle air amount during normal idling (warming up), the engine speed during fast idling is also during idling (warming up). The engine rotation speed is increased by a certain rotation speed based on the idle rotation speed. After the engine is warmed up, the user (driver) manually pushes the outer shaft member 154 of the plunger 112 and moves the plunger 152 (the inner shaft member 153 and the outer shaft member 154) to the push position. The normal idle state is entered (see FIG. 18). Accordingly, the idle air amount is the normal idle air amount (the adjusted normal idle air amount), and the engine rotational speed is the idle rotational speed during normal idle.

  According to the idle air amount adjusting device 150 described above, the idle air amount is switched between the normal idle air amount and the fast idle air amount by changing the position of the first valve part 164 by the push-pull operation of the outer shaft member 154 of the plunger 152. Can do. In the push position, the normal idle air amount can be adjusted by adjusting the position of the second valve portion 170 by the rotation operation of the inner shaft member 153 of the plunger 152. Further, at the pulling position of the plunger 152, the both valve portions 164 and 170 open the bypass passage 106 so that the air amount increased by a fixed amount based on the adjusted normal idle air amount becomes the fast idle air amount. Therefore, it is possible to obtain a fast idle air amount that is increased by a fixed amount with reference to the adjusted normal idle air amount. Thus, unlike the conventional example, even if the normal idle air amount is adjusted (increased or decreased), it is possible to prevent the fast idle air amount from being excessive or insufficient.

  Further, the first valve portion 164 is provided so as to be capable of changing the position in the axial direction by a push-pull operation, and opens and closes the bypass passage 106, and the first valve portion 164 is branched to bypass the bypass passage 106. An outer shaft member 154 having an auxiliary passage 173 that merges, and an inner shaft member that has a second valve portion 170 that can be adjusted in the axial direction by a turning operation and that opens and closes the auxiliary passage 173 of the outer shaft member 154 And a plunger 152 having an internal / external double-shaft structure.

[Embodiment 4]
A fourth embodiment will be described. Since the present embodiment is a modification of the third embodiment, the changed portion will be described and redundant description will be omitted. FIG. 20 is a cross-sectional view showing the idle air amount adjusting device.
As shown in FIG. 20, in this embodiment, the inner shaft member 153 in the third embodiment (see FIG. 17) includes an operation shaft 180 on the tool engagement groove 160 side and an operation shaft 182 on the second valve portion 170 side. It is divided into and. The operation shaft 180 and the operation shaft 182 are connected via a screw mechanism 184. The screw mechanism 184 includes a screw shaft 185 having a male screw concentrically formed on the operating shaft 182 and a screw hole 186 formed concentrically on the operation shaft 180 and screwed to the screw shaft 185 so as to have a screw. Become. Further, the screw mechanism 156 (see FIG. 17) in the third embodiment is omitted. The screw mechanism 184 corresponds to a “rotational linear motion conversion mechanism” in this specification.

  A coil spring 188 is interposed between the operation shaft 180 and the operation shaft 182. The coil spring 188 is fitted on the screw shaft 185. The coil spring 188 biases the operation shaft 180 and the operation shaft 182 in the opposite direction. Thereby, shakiness of the operating shaft 182 in the axial direction is prevented. The operation shaft 180 is disposed in the outer shaft member 154 so as to be rotatable in the direction around the axis. Although not shown, an axial movement restricting means for restricting movement of the operating shaft 180 in the axial direction is provided between the operating shaft 180 and the outer shaft member 154. Therefore, the operation shaft 180 can be rotated only in the direction around the axis without moving in the axial direction. Further, the operating shaft 182 is disposed in the outer shaft member 154 so as to be movable in the axial direction. Although not shown, key means for preventing the operation shaft 182 from rotating is provided between the operation shaft 182 and the outer shaft member 154. Therefore, the operating shaft 182 can move only in the axial direction without rotating in the direction around the axis.

  According to the present embodiment, the operating shaft 182 moves in the axial direction via the screw mechanism 184 by a rotation operation around the operation shaft 180 in the push position of the plunger 152. Thereby, the normal idle air amount can be adjusted.

[Embodiment 5]
A fifth embodiment will be described. Since this embodiment adds the change to the said Embodiment 4, the changed part is demonstrated and the overlapping description is abbreviate | omitted. FIG. 21 is a sectional view showing the idle air amount adjusting device.
As shown in FIG. 21, in this embodiment, the screw shaft 185 and the screw hole 186 of the screw mechanism 184 in the fourth embodiment (see FIG. 20) are reversely arranged. That is, the screw shaft 185 is formed in the operation shaft 180, and the screw hole 186 is formed in the operation shaft 182.

  The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Throttle device 12 ... Throttle body 14 ... Intake passage 19 ... Throttle valve 30 ... Valve chamber 34 ... Bypass passage 40 ... Idle air amount adjustment device 42 ... Plunger (operation member)
64 ... Valve member 80 ... 1st opening hole (inlet side opening of 1st channel | path)
84 ... 2nd opening hole (entrance side opening of the 2nd passage)
86 ... 3rd opening hole (entrance side opening of the 3rd passage)
DESCRIPTION OF SYMBOLS 102 ... Valve chamber 106 ... Bypass passage 110 ... Idle air quantity adjusting device 112 ... Plunger 114 ... Plunger (operation member)
116: Valve portion (valve member)
141 ... 1st taper part (1st valve part)
143 ... 2nd taper part (2nd valve part)
DESCRIPTION OF SYMBOLS 150 ... Idle air amount adjustment apparatus 152 ... Plunger 153 ... Inner shaft member (operation member)
154 ... Outer shaft member (operation member)
173 ... Auxiliary passage

Claims (5)

An idle air amount adjusting device that adjusts an idle air amount flowing through a bypass passage that bypasses a throttle valve,
An operation member provided for push-pull operation and rotation operation;
A valve member provided so that the position of the operation member can be changed in the axial direction by a push-pull operation, and the position of the operation member can be adjusted in the axial direction by a turning operation of the operation member.
The valve member opens the bypass passage so that the idle air amount becomes a normal idle air amount at the push position of the operation member, and the opening area of the bypass passage is adjusted by rotating the operation member. And the amount of air increased by a fixed amount based on the adjusted normal idle air amount adjusted at the push position of the operation member at the pull position of the operation member becomes the fast idle air amount. The idle air amount adjusting device characterized in that the bypass passage is opened. The idle air amount adjusting device according to claim 1,
The valve member is a piston-structured valve member;
The valve member includes a first passage that allows the normal idle air amount to flow and adjust the normal idle air amount in the bypass passage at the push position of the operation member, and the bypass passage at the pull position of the operation member. The idle air amount adjusting device according to claim 1, further comprising: a second passage through which the idle air amount that is increased by a certain amount is passed, and a third passage through which an air amount corresponding to the adjusted normal idle air amount is passed. The idle air amount adjusting device according to claim 2,
An idle air amount adjusting device, wherein the valve member is formed with an opening on the inlet side of the first passage and an opening on the inlet side of the second passage at a predetermined interval. The idle air amount adjusting device according to claim 1,
The valve member is a valve member having a needle structure,
The valve member is a tapered first valve portion that defines an opening area of the bypass passage so that the normal idle air amount flows through the bypass passage at a push position of the operation member and can adjust the opening area. When,
An idle air amount adjusting device comprising: a tapered second valve portion that defines an opening area of the bypass passage so that the fast idle air amount flows through the bypass passage at a pull position of the operation member. . The idle air amount adjusting device according to claim 1,
The operation member includes an inner shaft member and an outer shaft member having an inner / outer double shaft structure,
The outer shaft member is provided so that the position of the outer shaft member can be changed in the axial direction by a push-pull operation, and the valve member that opens and closes the bypass passage, and the branching and merging so as to bypass the valve member with respect to the bypass passage. Has an auxiliary passage to
The inner shaft member is provided so as to be adjustable in position in the axial direction by a turning operation, and has a valve member that opens and closes an auxiliary passage of the outer shaft member.

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