JP2006177322A - Throttle valve operating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a throttle valve operating device having a swivel mechanism and improve its durability. <P>SOLUTION: A connection member 5 is turnably supported on a valve lever 4 integrated with a turning valve element 3 through a bearing member 7, and a member 6a for hook of an operation cable 6 is engaged with an engaging hole 5a provided in the connection member to constitute the swivel mechanism. A stopper piece 4b for bending a part of the valve lever onto a carburetor main body 1 side and letting it abut on an idling adjusting screw 8 is provided. Since it is possible to suppress occurrence of a dead space by bringing the idling adjusting screw close to a carburetor main body, miniaturization of the throttle valve operating device can be promoted, and wear due to mutual slide-contact of metal units is prevented using the bearing member to improve durability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a throttle valve operating device provided with a swivel mechanism that connects a valve lever integrated with a throttle valve and an operating cable.

  Conventionally, in order to remotely control the opening and closing of the throttle valve with a control cable in a carburetor, a valve lever that is integrated with the rotary shaft of the throttle valve and extends radially outward, and the extension of the valve lever There is one in which an operation cable is connected to an end via a swivel mechanism (for example, see Patent Document 1).

Actual application No. 2-98543 microfilm

  In the case of the above-mentioned patent document, a cylindrical metal fitting as a hook member is fixed to the end portion of the valve lever, and an operation cable is connected to a connecting member (locking body) provided rotatably at the extended end portion of the valve lever. An engagement hole for engaging the metal fitting in the pulling direction is provided. A stopper is provided by bending a part of the valve lever into an L shape to prevent the fitting from coming out of the engagement hole against displacement in a direction opposite to the pulling direction of the operation cable. .

  On the other hand, a connecting member for connecting the operation cable is provided on the side opposite to the carburetor main body side of the valve lever (in a direction away from the carburetor main body). It bends away. Further, the idling adjustment of the carburetor is performed by interlocking the valve lever by screwing the idling adjusting screw provided on the carburetor main body side. Therefore, the tip of the idling adjustment screw is brought into contact with the stopper which is a part of the valve lever.

  Therefore, the idling adjustment screw is disposed at a position away from the carburetor main body, and is provided at a relatively high position in the height direction of the carburetor main body. In the idling adjustment screw, as described above, since the valve lever is brought into contact with the rotating direction, the shaft portion and the head protrude outside the rotating range of the valve lever. As described above, in the structure described above, the idling adjustment screw protrudes greatly to the outside of the carburetor body, which is a factor that hinders downsizing of the carburetor.

  Also, in the assembly structure of the connecting member and the valve lever, the small diameter portion of the connecting member is rotatably supported by the support hole provided in the valve lever, and when both members are made of metal In order to ensure smooth rotation, a soft material is selected as one of the materials, and in this case, there is a problem that durability is inferior due to wear. One of them may be formed of a resin material, but it must be made of a material that can ensure its original function, and smoothness cannot be emphasized.

  In order to solve such a problem and realize the promotion of downsizing and improvement of durability of the throttle valve operating device having a swivel mechanism, in the present invention, the throttle valve is integrated with the throttle valve and radially outward. And a connecting member provided at an end of the valve lever in the extending direction so as to be rotatable about an axis substantially parallel to the axis of the throttle valve. By fixing the hook member and providing the engagement member with an engagement hole for engaging the hook member in a direction intersecting the axis thereof, and engaging the hook member with the engagement hole. An operation device for a throttle valve of a carburetor provided with a swivel mechanism for connecting the operation cable and the valve lever, wherein the connection member is pivotally supported by a synthetic resin bearing member on the valve lever. And a retaining piece for preventing the hook member from coming off from the engagement hole is formed integrally with the bearing member, and when the valve lever is idling by screwing the idling adjusting screw. In order to determine the stop position, a part of the valve lever is bent to the side opposite to the projecting side of the connecting member, and an idling adjustment locking piece is provided to contact the idling adjustment screw.

  In particular, an uneven engagement means for positioning the relative position between the bearing member and the valve lever is preferably provided, and a part of the uneven engagement means is used for adjusting the idling. It is good to consist of an engaging piece and the engaging convex part integrally molded by the said bearing member, and also the said bearing member being good to be integrally resin-molded and provided in the said valve lever.

  Thus, according to the present invention, in the swivel mechanism of the throttle valve operating device, the connecting member for connecting the operation cable is supported on the valve lever of the throttle valve via the synthetic resin bearing member. Even if is made of metal, smooth rotation of the connecting member is ensured and an appropriate material of the bearing member can be arbitrarily selected, so that the connecting member is directly supported by the valve lever. On the other hand, the durability of the support portion can be improved.

  Also, in order to prevent the hook member provided at the end of the operation lever from coming out of the engagement hole of the connecting member, the idling adjustment locking piece provided on the valve lever is placed on the side opposite to the carburetor body side. When it is provided so as to protrude, a dead space is likely to be generated between the valve lever and the vaporizer body, but an idling adjustment locking piece provided on the valve lever for connecting the idling adjustment screw is connected. By providing a bent side opposite to the projecting side of the member, it is possible to suppress the occurrence of dead space by bringing the corresponding idling adjustment screw closer to the carburetor body, which can promote downsizing of the throttle valve operating device. .

  In particular, since the relative position of the stopper piece provided on the bearing member is determined by relatively positioning the bearing member and the valve lever by the concave and convex engaging means, the size of the stopper piece can be minimized. The bearing member can be suitably downsized. Further, the idling adjustment engagement piece can be used by adopting a structure in which the engagement convex portion provided on the bearing member as a part of the uneven engagement means is engaged with the idling adjustment engagement piece. Furthermore, the assembly process of a bearing member can be skipped by integrally molding the bearing member with the valve lever.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the entirety of a carburetor for an internal combustion engine to which the present invention is applied. In the illustrated example, the intake passage 2 provided through the carburetor main body 1 in the front and back direction in the drawing is received in the carburetor main body 1 so as to be rotatable about an axis perpendicular to the axis. A rotary valve body 3 of the rotary throttle valve is provided.

  The rotary valve body 3 is provided with an air-fuel mixture passage 3a so as to change the intake passage 2 from a fully closed state to a fully open state in accordance with the rotation angle. A fuel nozzle (not shown) provided coaxially faces. A valve shaft 3b that protrudes outward (upward in the drawing) of the vaporizer body 1 is coaxially and integrally formed on the upper side of the rotary valve body 3 in the drawing, and is coaxial with the valve shaft 3b and the valve shaft 3b. The rotating valve body 3 is pivotally supported on the carburetor body 1 by the fuel nozzle formed. In addition, a cam mechanism is provided between the axial end surface of the rotating valve body 3 and the vaporizer body 1 so that the rotating valve body 3 is displaced upward in the drawing according to the rotation. Yes. In this way, the valve opening changes according to the rotation angle of the rotating valve body 3, the nozzle opening of the fuel nozzle changes according to the upward displacement of the rotating valve body, and the fuel corresponding to the valve opening. The amount of ejection is controlled.

  As shown in FIG. 2, a plate-like valve lever 4 extending in the radial direction is fixed to the protruding end of the valve shaft 3b. A connecting member 5 constituting a swivel mechanism is assembled to the radially extending end of the valve lever 4 so as to be rotatable about an axis parallel to the valve shaft 3b. As shown in FIG. 3, the connection member 5 is a member for engaging a large-diameter columnar hook member 6 a fixed to one end of an operation cable 6 connected to a remote operation lever (not shown). A joint hole 5a and a slit 5b communicating with the engagement hole 5a for passing the cable portion of the operation cable 6 are formed.

  The connecting member 5 is coaxially formed with a small-diameter shaft portion 5 c that protrudes downward in the figure, and the small-diameter shaft portion 5 c is a C-shaped bearing in a hole 4 a provided in the radially extending end of the valve lever 4. It is assembled via the member 7. The bearing member 7 is made of a synthetic resin material, and for example, a material that can be smoothly supported without being worn against the metal connecting member 5 can be easily selected.

  Although the bearing member 7 formed as a separate member is assembled to the valve lever 4 in the illustrated example, the valve lever 4 can be formed by integral resin molding. By doing so, the assembly man-hours can be reduced and the manufacturing cost can be reduced.

  Since the connection structure between the connection member 5 and the operation cable 6 is as described above, there is no problem because the hook member 6a engages with the engagement hole 5a in the pulling direction of the operation cable 6 which is the valve opening direction. In the direction of returning the operation cable 6 that is the valve closing direction, for example, when the valve lever 4, that is, the rotary valve body 3 is returned faster, or when the operation cable 6 is slack at the idling position, the operation cable 6 is returned. There is a possibility that the hook member 6a may come out of the joint hole 5a. In order to prevent the hook member 6a from coming off, the bearing member 7 is integrally formed with a wall-like retaining piece 7a along the outer peripheral surface of the connecting member 5 in the assembled state.

  As shown in FIG. 4, the protrusion height of the retaining piece 7a does not need to cover the entire opening 5d of the engaging hole 5a that opens on the outer peripheral surface of the connecting member 5, and is received in the engaging hole 5a. The hook member 6a in the formed state may be locked to the direction in which it is pulled out.

  Further, in order to regulate the idling position of the rotating valve body 3, the valve lever 4 is formed by bending a part of the outer peripheral end of the portion where the connecting member 5 is assembled to the carburetor body 1 side in an L shape. The carburetor body 1 is provided with an idling adjusting screw 8 that comes into contact with the stopper piece 4b so as to be able to be screwed back and forth.

  The idling adjustment screw 8 is provided so as to be screwed and screwed so that the tip of the screw can come into contact within the range of the arc motion of the stopper piece 4b in the idling adjustment region. An example of the state after idling adjustment is shown in FIG. In this way, the stopper piece 4b is pushed by rotating the eye ring adjusting screw 8 (the tip of the screw protrudes), the valve lever 4 is rotated in the valve opening direction, and an idling state is set to an arbitrary valve opening angle. can do.

  Since the outer cover of the operation cable 6 is fixedly supported by a bracket 1a erected on the vaporizer body 1 as shown in FIGS. 1 and 2, the displacement direction of the operation cable 6 is substantially linear. On the other hand, since the valve lever 4 moves in an arc, the connecting member 5 rotates relative to the shaft support portion of the connecting member 5 in the valve lever 4. For this reason, even if the opening 5d of the engagement hole 5a is displaced with the rotation of the connecting member 5, it is necessary to always prevent the retaining piece 7a from coming off.

  In the illustrated example, as shown in FIG. 3, a positioning piece 7 b is integrally formed on the bearing member 7 as an engaging convex portion in which a part of the outward flange portion is bent in an L shape at the outer peripheral end of the valve lever 4. The projecting piece 4c that restricts the relative rotation of the bearing member 7 with respect to the valve lever 4 so that the positioning piece 7b cooperates with the stopper piece 4b to sandwich the positioning piece 7b with respect to the rotation direction of the valve lever 4 is formed on the valve lever 4. Provided. In this way, the concave-convex engagement means for positioning the relative position between the bearing member 7 and the valve lever 4 is configured. Note that the protruding piece 4c in the illustrated example only protrudes outward in the radial direction, and thus can be easily processed (for example, pressed), but is bent into an L shape like the stopper piece 4b. Also good.

  Thereby, since the relative position of the bearing member 7 does not change with respect to the rotational movement of the valve lever 4, the circumferential length of the retaining piece 7a can be minimized. In the illustrated example, a stopper piece 4b provided on the valve lever 4 for other uses is used for sandwiching the positioning piece 7b from both sides in the rotational direction, and the above-described concave and convex engaging means can be added with the minimum necessary amount. The cost can be suppressed.

  In the case where the uneven engagement means is not provided, the circumferential width of the retaining piece 7a may be set large.

  In this manner, the stopper member 7a provided on the valve lever 4 is provided with the stopper piece 7a provided on the valve lever 4 by preventing the hook member 6a of the operation cable 6 from coming off from the connecting member 5 by the stopper piece 7a provided on the bearing member 7. The valve lever 4 can be bent to the side opposite to the protruding side of the connecting member 5 and positioned on the vaporizer body 1 side. Therefore, in the case where the conventional stopper piece also serves as a stopper, the stopper piece is extended from the valve lever 4 in a direction away from the vaporizer body 1 (projecting outward), while idling adjustment is performed. Since the height of the screw 8 from the upper surface of the vaporizer body 1 (h in FIG. 1) can be reduced, the protruding portion from the vaporizer body 1 can be made as small as possible, and the overall downsizing is promoted. obtain. Further, by providing the bearing member 7 separately, it is possible to prevent wear due to sliding contact between metals as in the conventional case, and it is possible to improve durability.

It is a front view which shows the whole carburetor for internal combustion engines to which this invention was applied. It is the top view seen from the arrow II line of FIG. It is a disassembled assembly perspective view of a connection member and a bearing member. It is a longitudinal cross-sectional view which shows the assembly | attachment state of a connection member and a bearing member. FIG. 3 is a view corresponding to FIG. 2 showing a state after adjusting for idling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vaporizer body 3 Rotating valve body, 3b Valve shaft 4, Valve lever, 4b Stopper piece 5 Connecting member, 5a Engagement hole 6 Operation cable, 6a Hook member 7 Bearing member, 7a Retaining piece, 7b Positioning piece 8 Idling Adjustment screw

Claims (4)

A valve lever integrated with the throttle valve and extending outward in the radial direction, and a connecting member provided at the end of the valve lever in the extending direction so as to be rotatable about an axis substantially parallel to the axis of the throttle valve And
The hook member is fixed to the end portion of the operation cable, and an engagement hole for engaging the hook member in the direction intersecting the axis of the connecting member is provided, and the hook member is connected to the engagement hole. An operation device for a throttle valve of a carburetor provided with a swivel mechanism for connecting the operation cable and the valve lever by being engaged with each other,
The connecting member is pivotally supported by the valve lever through a synthetic resin bearing member, and a retaining piece for preventing the hook member from coming off from the engagement hole is integrally formed on the bearing member. And
In order to determine the idling stop position of the valve lever when the idling adjusting screw is screwed back and forth, a part of the valve lever is bent to a side opposite to the protruding side of the connecting member and abuts against the idling adjusting screw. A throttle valve operating device comprising an idling adjustment locking piece to be operated.   2. The throttle valve operating device according to claim 1, wherein concave and convex engaging means for positioning a relative position between the bearing member and the valve lever is provided.   3. The throttle according to claim 1, wherein a part of the concave / convex engaging means includes the idling adjustment engaging piece and an engaging convex portion integrally formed with the bearing member. Valve operating device. The throttle valve operating device according to any one of claims 1 to 3, wherein the bearing member is integrally molded with the valve lever.

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