JP3994566B2 - Wire operated sliding throttle valve type vaporizer - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a carburetor for adjusting and controlling the amount of air-fuel mixture supplied to an engine, of which a wire-operated sliding throttle valve type carburetor whose opening and closing is controlled by a sliding throttle valve operated by an accelerator wire. About.
[0002]
[Prior art]
A conventional wire-operated sliding throttle valve type carburetor is shown in FIGS.
FIG. 4 is a longitudinal sectional view of a wire-operated sliding throttle valve type vaporizer.
FIG. 5 is an assembled perspective view of the sliding throttle valve portion. It is.
Reference numeral 1 denotes a carburetor main body through which an intake passage 2 passes, and a throttle valve guide tube 3 is continuously provided upward from the intake passage.
Reference numeral 4 denotes a floating chamber, which is formed by a lower concave portion of the vaporizer main body 1 and the floating chamber main body 5, and a constant fuel liquid level is formed and held therein.
Reference numeral 6 denotes a needle jet that opens to the intake passage 2.
Reference numeral 7 denotes a sliding throttle valve having a cylindrical shape, and the sliding throttle valve 7 includes the following.
The cylindrical portion 7A is formed in a cylindrical shape from the upper end 7B toward the lower end 7C. On the inner wall 7D of the cylindrical portion 7, an upper bottom portion 7E facing the upper end 7B and a lower bottom portion 7F facing the lower end 7C are formed. A thick portion 7G is formed between the upper bottom portion 7E and the lower bottom portion 7F.
Reference numeral 7H denotes a wire end hole, which is drilled from the lower bottom portion 7F toward the upper bottom portion 7E, and opens to the upper bottom portion 7E through a locking step portion 7J having a reduced diameter.
A positioning hole 7K is formed in the upper bottom portion 7E downward.
Furthermore, the wire insertion groove 7L is formed by cutting out (cutting the cylindrical portion 7A) inward of the cylindrical portion 7A as it goes from the upper end 7B to the lower end 7C of the cylindrical portion 7A. The groove 7L reaches the wire end 7H.
Reference numeral 7M denotes a jet needle insertion hole formed in the center of the sliding throttle valve 7 and drilled from the upper bottom portion 7E toward the lower bottom portion 7F.
Reference numeral 8 denotes a jet needle disposed in the jet needle insertion hole 7 </ b> M of the sliding throttle valve 7. Reference numeral 9 denotes a flat plate-like valve plate that is disposed on the upper bottom portion 7E of the sliding throttle valve 7. A positioning pin 9A that protrudes downward is disposed on the lower surface of the valve plate 9, and further on the upper bottom portion 7E. A notch groove 9B facing the wire insertion groove 7L including the open wire end hole 7H is formed.
The notch groove 9B does not block the wire end hole 7H and the wire insertion groove 7L.
9C is a hole through which the upper part of the jet needle 8 can be inserted.
Reference numeral 10 denotes a valve clip formed of a leaf spring material. A semicircular bent portion 10A is formed at one end of the valve clip, and a forked portion 10B opening from the bent portion 10A toward the other end is formed.
Note that the open end of the bifurcated portion 10B extends outward.
[0003]
A jet needle 8 is assembled to the sliding throttle valve 7 as follows. The jet needle 8 is inserted into the jet needle insertion hole 7M that opens to the upper bottom portion 7E of the sliding throttle valve 7. At this time, the clip on the upper portion of the jet needle 8 is placed on the upper bottom portion 7E. Is positioned.
Next, the valve plate 9 is disposed on the upper bottom portion 7E. At this time, the positioning pin 9A is inserted and disposed in the positioning hole 7K opened in the upper bottom portion 7E, and the notch groove 9B is inserted in the wire inserted in the upper bottom portion 7E. The groove 7L and the wire insertion groove 7L are arranged in an open state without being closed.
Further, the valve clip 10 is inserted and arranged on the valve plate 9, and at this time, the bifurcated portions 10B and 10B of the valve clip 10 are compressed so as to approach each other, and are inserted and arranged along the inner wall 7D of the cylindrical portion 7A. Therefore, in the state where the valve clip 10 is arranged on the valve plate 9, the compression for urging the bifurcated portions 10B and 10B to approach each other is released.
On the other hand, when the valve clip 10 is disposed on the valve plate 9, the bifurcated portions 10 </ b> B and 10 </ b> B of the valve clip 10 are disposed so as not to block the notch groove 9 </ b> B of the valve plate 9.
According to the above, the valve plate 9 disposed on the upper bottom portion 7E of the sliding throttle valve 7 is prevented from rotating on the upper bottom portion 7E by the positioning pin 9A being inserted into the positioning hole 7K. The notch groove 9B can be kept open without closing the wire insertion groove 7L and the wire end hole 7H that open to the upper bottom portion 7E.
On the other hand, the valve clip 10 disposed on the valve plate 9 has its bifurcated portions 10B, 10B pressed with elasticity toward the inner wall 7D of the cylindrical portion 7A, so that the valve plate 9 is separated from the upper bottom portion 7E, Escape upwards is prevented.
[0004]
The sliding throttle valve in the wire-operated sliding throttle valve type vaporizer is assembled to the vaporizer main body 1 by the following.
A wire 13 having a wire end 12 attached to the end of the opening 11A formed in the center of the top 11 that closes the upper opening of the throttle valve guide tube 3 is inserted downward from the top 11.
Next, the wire 13 is moved and arranged inward from the inner wall 7D of the cylindrical portion 7A via the wire insertion groove 7L of the cylindrical portion 7A of the sliding throttle valve 7 and is arranged in the notch groove 9B of the valve plate 9. To do.
At this time, the wire end 12 is once disposed further below the lower end 7C of the sliding throttle valve 7 and disposed inward from the cylindrical portion 7A.
Next, in the above state, the wire 13 is pulled upward and moved.
According to the above, the wire end 12 is disposed in the wire end hole 7H and locked to the locking step portion 7J, and the wire 13 is in the notch groove 9B of the valve plate 9 and the inner wall of the cylindrical portion 7A. It is arranged inward from 7D.
The sliding throttle valve 7 is inserted and arranged in the throttle valve guide cylinder 3 of the carburetor body 1, and in this state, the top 11 is screwed onto the outer periphery of the upper end of the throttle valve guide cylinder 3. A state in which the valve is disposed in the throttle valve guide tube 3 is shown in FIG.
Note that the throttle valve return spring that is contracted in the throttle valve guide cylinder 3 and presses the sliding throttle valve 7 downward is omitted.
[0005]
When the driver pulls up the wire 13, the upward pulling force is transmitted to the sliding throttle valve 7 via the wire end 12, and the sliding throttle valve 7 moves along the intake path 2 in accordance with the movement of the wire 13. Is released.
[0006]
[Problems to be solved by the invention]
According to such a wire-operated sliding throttle valve type vaporizer, it is difficult to reduce its manufacturing cost.
That is, first, the sliding throttle valve 7 needs to be provided with a positioning hole 7K at an eccentric position, and this cannot be performed simultaneously with the outer diameter machining of the sliding throttle valve 7. Therefore, the manufacturing cost is increased, and the manufacturing cost of the sliding throttle valve cannot be reduced.
Second, it is difficult to assemble the valve plate 9.
That is, the valve plate 9 is disposed from the opening at the upper end of the sliding throttle valve 7 toward the upper bottom, and at this time, the positioning pin 9A needs to be inserted into the positioning hole 7K.
However, at the time of such work, since the positioning pin 9A is below the back surface of the valve plate 9, the operator cannot insert and place it in the positioning hole 7K while confirming the position of the positioning pin 9A.
Therefore, many man-hours are required for the arrangement work of the valve plate 9, which hinders the reduction of the manufacturing cost.
[0007]
The present invention has been made in view of such a problem, and when assembling a valve plate to a sliding throttle valve, the manufacturing cost is reduced by increasing its workability, and thus an inexpensive wire-operated sliding throttle valve. An object is to provide a mold vaporizer.
[0008]
[Means for achieving the object]
In order to achieve the above object, the wire-operated sliding throttle valve type carburetor according to the present invention is provided with an accelerator wire having a sliding throttle valve slidably disposed in a throttle valve guide cylinder continuously provided in the intake passage. In the wire-operated sliding throttle valve type carburetor that is opened and closed to open and close the intake passage,
The sliding throttle valve has a cylindrical portion from the upper end toward the lower end, a thick portion between the upper bottom portion facing the upper end and the lower bottom portion facing the lower end in the cylindrical portion,
A wire end hole that opens from the lower base to the upper base through the locking step to the upper base,
A wire insertion groove that is drilled into the tubular part from the upper end to the lower end of the tubular part and reaches the wire end hole;
The plate-shaped valve plate includes a positioning pin protruding upward, and a notch groove facing the wire insertion groove including a wire end hole opened on the upper bottom portion;
A valve clip made of a leaf spring material includes a semicircular bent portion and a bifurcated portion that opens laterally from the bent portion;
Place the valve plate on the upper bottom of the sliding throttle valve with the positioning pin facing upward and the notch groove facing the wire insertion groove including the wire end hole.
Furthermore, the fork part of the valve clip is arranged on the valve plate with an elastic force in pressure contact with the inner wall of the cylindrical part of the sliding throttle valve, and the positioning pin is arranged inside the bent part.
[0009]
[Action]
According to the present invention, it is not necessary to make a positioning hole in the sliding throttle valve. When the valve plate is assembled to the upper bottom part of the sliding throttle valve, the notch groove of the valve plate that can be seen is directed to the wire insertion groove including the wire end hole that opens to the upper bottom part of the sliding throttle valve that can be seen. It can be arranged. Further, the manufacturing cost can be reduced.
[0010]
【Example】
Hereinafter, an embodiment of a wire-operated sliding throttle valve vaporizer according to the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing a state before a valve clip, a valve plate, and a jet needle are assembled into a sliding throttle valve.
FIG. 2 is a longitudinal sectional view of a sliding throttle valve type carburetor showing a state in which the sliding throttle valve is mounted on a carburetor body. FIG. 3 is an upper plan view showing a state in which a sliding throttle valve is disposed in the throttle valve guide cylinder. It is.
In the following description, only different parts from the prior art will be described, and the same structural parts are denoted by the same reference numerals and the description thereof is omitted.
The valve clip 10 and the jet needle 8 are the same as before.
The sliding throttle valve 7 is not provided with a positioning hole 7K drilled downward from the conventional upper bottom 7E. Other structures are the same as the conventional one.
The valve plate 9 is formed with a positioning pin 9P protruding upward from the upper surface thereof.
[0011]
A jet needle 8 is assembled to the sliding throttle valve 7 as follows. The jet needle 8 is inserted into the jet needle insertion hole 7M that opens to the upper bottom portion 7E of the sliding throttle valve 7. At this time, the clip on the upper portion of the jet needle 8 is placed on the upper bottom portion 7E. Is positioned.
Next, the valve plate 9 is disposed on the upper bottom portion 7E. At this time, the notch groove 9B of the valve plate 9 faces the wire insertion groove 7L including the wire end hole 7H opened on the upper bottom portion 7E, and the groove is formed. Corresponding arrangement is made in an open state without closing. In addition, the positioning pin 9P protruding from the upper surface of the valve plate 9 is disposed upward, and in this example, the positioning pin 9P is disposed on a substantially center line of the bifurcated portions 10B and 10B. And it arrange | positions in an open state, without obstruct | occluding the wire insertion groove | channel 7L.
Further, the valve clip 10 is inserted and arranged on the valve plate 9, and at this time, it is inserted and arranged along the inner wall 7D of the cylindrical portion 7A while compressing so that the bifurcated portions 10B and 10B of the valve clip 10 are close to each other. Therefore, in a state where the valve clip 10 is disposed on the valve plate 9, the compression for urging the bifurcated portions 10B and 10B to approach each other is released.
On the other hand, a positioning pin 9P protruding from the valve plate 9 is disposed inside the bent portion 10A of the valve clip 10 in a state where the valve clip 10 is disposed on the valve plate 9, and the bifurcated portion 10B, 10B is arranged on the side of the notch groove 9B so as not to close the notch groove 9B of the valve plate 9.
[0012]
According to the above, the valve clip 10 disposed on the valve plate 9 has the forked portion 10B, 10B pressed strongly and elastically toward the inner wall 7D of the cylindrical portion 7A. Is lifted upward, and the valve plate 9 is prevented from leaving the upper bottom portion 7E and escaping upward.
On the other hand, the valve clip 10 can sufficiently prevent the valve plate 9 from moving upward because the bifurcated portions 10B and 10B strongly press the inner wall 7D of the cylindrical portion 7A as described above. However, the valve plate 9 cannot be pressed sufficiently strongly on the upper bottom portion 7E of the sliding throttle valve 7.
Here, when a large vibration or rotational force is applied to the valve plate 9, the valve seat 9 is designed to rotate on the upper bottom portion 7E, but when the valve plate 9 starts to rotate on the upper bottom portion 7E, The positioning pin 9P attached integrally with the valve plate 9 contacts the inside of the bent portion 10A of the valve clip 10, and the rotation of the valve plate 9 is suppressed. This is because the valve clip 10 is strongly pressed against the inner wall 7D of the cylindrical portion 7A.
Therefore, the valve plate 9 can rotate only within a very small rotation range, and the valve plate 9 does not rotate any further, so that the notch groove 9B of the valve plate 9 always opens on the upper bottom 7E. The wire insertion groove 7L including the hole 7H can be held open.
[0013]
The sliding throttle valve 7 to which the jet needle 8, the valve plate 9, and the valve clip 10 are attached is attached with a wire 13 having a wire end 12 as in the prior art and is assembled to the carburetor body.
[0014]
【The invention's effect】
According to the wire-operated sliding throttle valve carburetor according to the present invention, since it is not necessary to make a positioning hole in the upper bottom portion of the sliding throttle valve, the manufacturing cost of the sliding throttle valve can be reduced.
In particular, when the valve plate is arranged on the upper bottom portion of the sliding throttle valve, the notch groove of the valve plate that is visible is directed to the wire insertion groove that includes the wire end hole that can be visually observed opening on the upper bottom portion. Since it can be arranged, the arrangement is very simple and can be performed in a short time.
Furthermore, the only significant change to the conventional parts is the positioning pins that are mounted on the valve plate, so that the implementation is very easy.
[Brief description of the drawings]
FIG. 1 is a perspective view showing components incorporated in a sliding throttle valve of a wire-operated sliding throttle valve type carburetor according to the present invention.
FIG. 2 is a longitudinal sectional view of a wire-operated sliding throttle valve type vaporizer according to the present invention.
3 is a top plan view of the sliding throttle valve in FIG. 2. FIG.
FIG. 4 is a longitudinal sectional view of a conventional wire-operated sliding throttle valve type vaporizer.
5 is a perspective view showing components that are assembled in the sliding throttle valve of FIG. 4; FIG.
[Explanation of symbols]
7 Sliding throttle valve 7A Tubular part 7E Upper bottom part 7H Wire end hole 7L Wire insertion groove 9 Valve plate 9P Positioning pin 9B Notch groove 10 Valve clip 10A Bending part 10B Two-way part

Claims (1)

In the wire-operated sliding throttle valve type carburetor, in which the sliding throttle valve that is slidably disposed in the throttle valve guide cylinder that is connected to the intake passage is operated by an accelerator wire to open and close the intake passage,
The sliding throttle valve 7 has a cylindrical portion 7A from the upper end 7B to the lower end 7C, and a thick wall between the upper bottom portion 7E facing the upper end 7B and the lower bottom portion 7F facing the lower end 7C in the cylindrical portion 7A. Part 7G,
A wire end hole 7H opening from the lower bottom portion 7F to the upper bottom portion 7E through the locking step 7J to the upper bottom portion 7E;
A wire insertion groove 7L that is drilled into the tubular portion 7A from the upper end 7B to the lower end 7C of the tubular portion 7A and reaches the wire end hole 7H;
The plate-shaped valve plate 9 includes a positioning pin 9P that protrudes upward, and a notch groove 9B that faces a wire insertion groove 7L including a wire end hole 7H that opens on the upper bottom 7E;
The valve clip 10 made of a leaf spring material includes a semicircular bent portion 10A and a forked portion 10B that opens to the side from the bent portion 10A;
The valve plate 9 is disposed on the upper bottom portion 7E of the sliding throttle valve 7 with the positioning pin 9P facing upward and the notch groove 9B facing the wire insertion groove 7L including the wire end hole 7H.
Further, on the valve plate, the bifurcated portion 10B of the valve clip 10 is disposed in pressure contact with the inner wall 7D of the cylindrical portion 7A of the sliding throttle valve 7 with elastic force, and the positioning pin 9P is disposed inward of the bent portion 10A. A wire-operated sliding throttle valve type vaporizer characterized by the above.

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