JPH0219290B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Field of Application The present invention provides a rotary motion member pivotally supported on a carburetor main body, and a rotary motion member fixed to the rotation shaft of the rotary motion member. The present invention relates to an operating amount adjusting device for a carburetor operating section, including an operating lever.

(2) Prior Art Conventionally, in such an operating amount adjusting device, for example, an idle opening adjustment device for a throttle valve, a threaded member for adjusting the idle opening is screwed into the carburetor main body so that its protrusion amount can be freely adjusted. By bringing the valve lever into contact with the threaded member, the limit angular displacement position of the throttle valve lever corresponding to the idle opening degree of the throttle valve is adjusted.

(3) Problems to be Solved by the Invention However, in the conventional device as described above, it is necessary to form a screw hole etc. in connection with the screw member, which complicates the structure and makes it difficult to prevent the screw member from loosening. The number of parts increases as a spring member is required to prevent this, and the assembly work is troublesome. In addition, if the carburetor is made of resin in order to reduce its weight, in the conventional structure, the bracket part that supports the screw member will deform due to the creep phenomenon peculiar to synthetic resin, causing the screw to loosen. This was also one of the factors that hindered efforts to reduce the weight of vessels.

The present invention has been made to solve such conventional technical problems, and provides an operating amount adjustment device for a carburetor operating section that has a simple structure that allows the carburetor to be made of resin, and that is easy to adjust. The purpose is to provide

B. Structure of the Invention (1) Means for Solving the Problems According to the present invention, a bearing hole having an axis parallel to the rotation axis is formed in the actuating lever, and a support is rotatably fitted into the bearing hole. A cam plate having a cam surface on the outer periphery is fixed to one end of the shaft protruding from the operating lever on the side opposite to the carburetor main body, and a cam plate having a cam surface on the outer periphery is fixed to the other end of the support shaft. A pair of locking portions having locking surfaces that are inclined in the direction of separation and lock onto the edge of the carburetor body side of the bearing hole apply a spring force in the direction of separation from each other via a split groove extending in the axial direction. A plurality of fitting holes are formed at intervals around the bearing hole in one of the opposing surfaces of the cam plate and the actuating lever, and the actuating lever can be fitted into the fitting holes. A fitting protrusion is provided protruding from the other opposing surface of the cam plate and the operating lever, and a stopper portion that can come into contact with the cam surface is fixedly provided on the carburetor main body.

(2) Effect According to the above configuration, both the locking parts of the support shaft are locked to the edge of the carburetor body side of the bearing hole while exerting spring force in the direction of separating from each other, so that the fitting protrusion is biased in the direction of fitting into the fitting hole, and by applying a forced rotational force, the cam plate can be rotated against the biasing force. By changing the angular displacement position of the cam plate, the contact position of the cam surface against the stopper portion is adjusted, and the limit angular displacement position of the actuating lever, that is, the rotary movement member, is adjusted by the contact position of the cam surface with the stopper portion. can be adjusted. Furthermore, the angular displacement position of the cam plate can be elastically held by an extremely simple structure in which a bearing hole is bored in the operating lever and a support shaft is inserted into the bearing hole.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1, 2, and 3, this carburetor 1 is used, for example, in a general-purpose engine, and Resin vaporizer body 2
A synthetic resin float chamber body 3 forming the float chamber 4 is connected by a pair of engaging claws 5 and 6 integrally provided on the float chamber body 3.
An intake passage 7 is bored in the carburetor main body 2, and in the middle of this intake passage 7, a chiyoke valve 9 and a rotary movement member are installed in order from the upstream side along the intake direction indicated by an arrow 8. The throttle valves 10 are rotatably supported. A synthetic resin assembly lever 12 is installed on the outside of the carburetor body 2 and is fixed to the rotating shaft 11 of the choke valve 9, and this lever 12 opens the choke valve 9 by the spring force of a spring 13. spring biased in the direction. A connecting shaft 14 is provided on the connecting shaft 14 and is connected to a connecting shaft 14, which is not shown in the drawings. Further, on the outside of the carburetor main body 2, a synthetic resin throttle valve lever 16 as an operating lever is arranged and fixed to the rotating shaft 15 of the throttle valve 10. A governor mechanism (not shown) is connected to the connecting shaft 17 via a link. Moreover, the throttle valve lever 16 is rotationally biased in the direction of opening the throttle valve 10 by the spring force of the spring 18, and during idling, the throttle valve lever 16 is rotationally driven in the opposite direction to the biasing direction. , the idle opening degree is maintained by the configuration described below.

In FIG. 3, a bench lily 19 is provided between the choke valve 9 and the throttle valve 10 of the intake passage 7, and a fuel nozzle 20 is disposed in the carburetor main body 2, opening into this bench lily 19. A bleed pipe 21 is concentrically and integrally connected to the fuel nozzle 20, and a fuel jet 22 that opens into the fuel oil in the float chamber 4 is attached to the lower end of the bleed pipe 21. A bleed passage 24 is bored in the carburetor main body 2 and communicates with an annular chamber 23 surrounding the bleed pipe 21.
4 is opened on the upstream side of the intake path 7 from the intake valve 9. The bleed air introduced into the annular chamber 23 is introduced into the bleed pipe 21 through the bleed hole 25, whereby the emulsified fuel flows into the fuel nozzle 20 according to the intake negative pressure of the bench lily 19.
The air is sucked into the intake passage 7 and mixed with the air flowing through the intake passage 7 to form an air-fuel mixture.

Referring also to FIG. 4, the throttle valve lever 16 has a cam on its outer periphery that allows for gradual angular displacement about an axis parallel to the rotation axis at a position offset from its rotation axis. A cam plate 26 having a surface 27 is supported. The cam plate 26 is integrally provided at one end of the support shaft 28, and the cam plate 26 and the support shaft 28 are integrally molded from synthetic resin.

Further, referring also to FIG. 5, the throttle valve lever 16 is provided with a bearing hole 29 having an axis parallel to the rotating shaft 15 and into which the support shaft 28 is rotatably fitted. Ru. Furthermore, a plurality of fitting holes 30 (eight in the figure) are bored at intervals in the circumferential direction around the bearing hole 29 on one of the facing surfaces of the cam plate 26 and the throttle valve lever 16, for example, on the outer surface of the throttle valve lever 16. A pair of fitting protrusions 31 are provided on the other of the opposing surfaces, for example, the inner surface of the cam plate 26, so as to fit into the fitting holes 30 thereof. Thus, when the fitting protrusion 31 is fitted into the fitting hole 30, the angular displacement positions of the support shaft 28 and the cam plate 26 are maintained. Moreover, the depth of each fitting hole 30 and the fitting protrusion 3
The amount of protrusion 1 is set to a value such that the fitted state of both 30 and 31 will not come off with a slight force. Furthermore, an engagement groove 32 into which a screwdriver or the like can be engaged is provided on the outer surface of the cam plate 26. By engaging a screwdriver or the like with this engagement groove 32 and applying a forced rotational force, the cam The plate 26 is a fitting protrusion 31
Then, the fitting state of the fitting hole 30 can be released and the fitting state can be angularly displaced in stages.

At the other end of the support shaft 28, a pair of locking portions 35 are provided, each having locking surfaces 33 and 34 that are inclined in a direction that moves away from each other as they move away from the cam plate 26.
36 are provided with a groove 37 extending in the axial direction interposed therebetween. Moreover, those locking parts 35,
36 are formed to bulge out to opposite sides,
The amount of bulge d1 is set to such an extent that the locking portions 35 and 36 can be inserted into the bearing hole 29 when the locking portions 35 and 36 are brought close to each other. Furthermore, cutout surfaces 38 and 39 corresponding to the outer circumferential surface of the support shaft 28 are formed at both circumferential ends of both the locking portions 35 and 36, respectively, so that the support shaft 28 can be inserted into the bearing hole 29. Insertion becomes possible.

When the locking portions 35 and 36 of the support shaft 28 are fitted into the bearing hole 29, they exert a spring force in a direction that separates them from each other. Therefore, both locking portions 35,
The locking surfaces 33 and 34 of 36 are locked to the end edge of the bearing hole 29 on the side of the carburetor body 2, and the support shaft 2 from the bearing hole 29 is locked.
In addition to exhibiting the retaining function of 8, the support shaft 28
The insertion direction, that is, the cam plate 26, the throttle valve lever 1
It exerts a spring force in the direction of approaching 6. As a result, the fitting protrusion 31 is elastically fitted into the fitting hole 30, and the angular displacement position of the cam plate 26 is maintained. Moreover, since the support shaft 28 is made of synthetic resin, the spring force is efficiently exerted.

Referring again to FIG. 2, the carburetor main body 2 is integrally equipped with a stopper portion 41 that can come into contact with the cam surface 27 of the cam plate 26 on the lower side along the rotation direction 40 of the throttle valve lever 16 in the valve closing direction. It is installed protrudingly. The position of the stopper portion 41 is set so that the rotational position of the throttle valve lever 16 when it comes into contact with the cam surface 27, that is, the opening position of the throttle valve 10, is the idle opening position. The idle opening degree of the throttle valve 10 is determined according to the limit angular displacement position.

Next, the operation of this embodiment will be explained.
To adjust the idle opening of the throttle valve 10, first, a driver or the like is engaged with the engagement groove 32 of the cam plate 26, and the cam plate 26 is forcibly angularly displaced by a desired angle. As a result, the stopper portion 4 of the cam surface 27
1 is adjusted, and accordingly, the idle opening degree of the throttle valve 10 is adjusted via the throttle valve lever 16. When the forced rotational force of the cam plate 26 is released after adjusting the opening, the cam plate 26 is urged to approach the throttle valve lever 16 side by both the locking parts 35 and 36 of the support shaft 28, and as a result, The fitting protrusion 31 is elastically fitted into the fitting hole 30, and the angular displacement positions of the throttle valve lever 16 and the throttle valve 10 during idling operation are maintained.

Moreover, the bearing hole 2 drilled in the throttle valve lever 16
9, a support shaft 28 having a pair of locking portions 35 and 36 with a split groove 37 extending in the axial direction interposed therebetween;
The locking surfaces 3 of the locking portions 35 and 36
With an extremely simple structure in which 3 and 34 are resiliently engaged with the edge of the bearing hole 29 on the side of the carburetor body 2, the angular displacement position of the cam plate 26 can be resiliently held. This eliminates the conventional problems such as loosening of screw members, makes it possible to use resin for the carburetor, and reduces the number of parts. Additionally, the cam plate 26 and the support shaft 28 can be attached and detached from the throttle valve lever 16 at any position within the rotation range of the throttle valve lever 16, making it possible to attach and detach the cam plate 26 and the support shaft 28 only at fixed positions. In comparison, the degree of freedom in arranging the members disposed around the throttle valve lever 16 increases.

The present invention provides not only the throttle valve idle opening adjustment device described in the above-described embodiments, but also a rotary movement member,
The present invention can be widely implemented as an operating amount adjusting device for a carburetor operating section, including an operating lever that operates the rotational movement member.

C. Effects of the Invention As described above, according to the present invention, a cam plate having a cam surface on its outer periphery is rotatably supported on the operating lever, and a stopper portion that can come into contact with the cam surface is fixedly attached to the carburetor main body. Since the cam plate is installed in the actuating lever, it is possible to use resin for the carburetor without problems such as loosening of screw members as in the past, and the cam plate can be attached and detached from the actuating lever at any position within the rotation range of the actuating lever. This makes it possible to increase the degree of freedom in arranging members around the actuating lever.

Moreover, the locking surfaces of the pair of locking portions provided on the support shaft are elastically locked to the edge of the bearing hole on the side of the carburetor body, and the locking surfaces of the pair of locking portions provided on the support shaft are elastically locked to the end edge of the bearing hole on the side of the carburetor body, and With an extremely simple configuration in which a fitting protrusion protruding from the other of the facing surfaces of the cam plate and the actuating lever is fitted into the fitting hole, the angular displacement position of the cam plate can be held elastically. , parts such as springs are not required, and the number of parts can be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a cross-sectional view taken along the line -- of FIG. FIG. 5 is an exploded perspective view of the valve lever and the cam plate, and FIG. 5 is a sectional view of the main part showing the state in which the cam plate is attached to the throttle valve lever. DESCRIPTION OF SYMBOLS 1... Carburetor, 2... Carburizer main body, 10... Throttle valve as a rotating member, 15... Rotating shaft, 1
6... Throttle valve lever as actuation lever, 26...
...Cam plate, 27...Cam surface, 28...Spindle, 29
... bearing hole, 30 ... fitting hole, 31 ... fitting projection, 33, 34 ... locking surface, 35, 36 ... locking part, 37 ... dividing groove, 41 ... stopper part.

Claims (1)

[Claims] 1. Rotating member 10 pivotally supported by carburetor main body 2
and an actuating lever 16 fixed to the rotating shaft 15 of the rotating member 10, the bearing hole 29 having an axis parallel to the rotating shaft 15 is arranged to A support shaft 2 is bored in the lever 16 and rotatably fitted into the bearing hole 29.
A cam plate 26 having a cam surface 27 on the outer periphery is fixed to one end protruding from the operating lever 16 on the opposite side from the carburetor main body 2 of No. A pair of locking portions 35 and 36 extend in the axial direction and have locking surfaces 33 and 34 that are inclined in directions that move away from each other toward the sides and lock onto the edge of the bearing hole 29 on the side of the carburetor body 2. Split groove 3
The cam plate 26 and the actuating lever 16 are provided with a plurality of fitting holes at intervals around the bearing hole 29 on one side of the opposing surfaces of the cam plate 26 and the actuating lever 16. A hole 30 is drilled, and a fitting protrusion 31 that can fit into the fitting hole 30 is provided protruding from the other opposing surface of the cam plate 26 and the operating lever 16. An operating amount adjusting device for a carburetor operating section, characterized in that an abuttable stopper section 41 is fixedly provided. 2 The locking portions 35 and 36 are bulged in opposite directions with respect to the split groove 37, and both circumferential ends of the bulged locking portions 35 and 36 are connected to the support shaft 2.
8. The operating amount adjusting device for a carburetor operating section according to claim 1, wherein the notch is cut out corresponding to the outer circumferential surface of the carburetor operating section. 3. The operating amount adjusting device for a carburetor operating section according to claim 1 or 2, wherein the cam plate 26 and the support shaft 28 are integrally molded from synthetic resin. 4. The rotational movement member is the throttle valve 10, the operating lever is the throttle valve lever 16, and the stopper portion 41 and the cam plate 26 are arranged to abut each other at the idle opening position of the throttle valve 10. An operating amount adjusting device for a carburetor operating section according to claim 1, 2, or 3, characterized in that: