JPH10311249A - Idling regulating device for slide throttle valve type carburetor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idling regulation device which improves slide durability of the throttle valve of a slide throttle type carburetor and improve reproducibility of low speed fuel. SOLUTION: A holder member slide hole 5F is formed in the guide cylinder part 5D of a top cover 5, thread-mounted on a throttle valve guide cylinder 3, from an upper end 5H toward below. An end insertion hole 5G is formed from a holder member slide hole 5F through a lock stepped part 5E. A coupling member 6 is provided at a lower end with an end 7 and at an upper end with a holder member 8 in which a wire end hole 8A is formed. The end 7 of the coupling member 6 is locked at a throttle valve 4, a wire end 14 is locked at the holder member 8 and the holder member 8 is movably arranged in the holder member slide hole 5F. The holder member 8 is brought into contact with a lock stepped part 5E and through screw movement of the top cover 5, the idling opening of the throttle valve 4 is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporizer for controlling the concentration and amount of an air-fuel mixture supplied to an engine.
A throttle valve guide cylinder is connected to an intake passage penetrating the carburetor body, and the idling adjustment of a sliding throttle valve carburetor whose intake passage is opened and closed by a throttle valve movably arranged in the throttle valve guide cylinder Related to the device.

[0002]

2. Description of the Related Art A conventional idling adjusting device for a sliding throttle valve type carburetor is shown in FIG. 10 is the intake path 1 inside
Reference numeral 1 denotes a penetrated carburetor body, which is connected to an intake passage 11 to form a throttle valve guide cylinder 12.
Opens upward. In the throttle valve guide cylinder 12,
The throttle valve 13 is movably disposed, and the throttle valve 13 has an inclined surface 13A formed from the outer periphery toward the inside. The throttle valve 13 has a wire end 14 disposed at the end of the accelerator wire W operated by the driver inserted into the end insertion hole 13B and locked by the end locking step 13C. . On the other hand, the vaporizer body 10
The idle adjustment screw 15 is screwed into the
The idle adjusting screw 15 is disposed in the horizontal direction, and its tip 15A contacts the inclined surface 13A of the throttle valve 13.

[0003]

According to the conventional sliding throttle valve type carburetor, the idling opening of the throttle valve 13 is adjusted by screwing the idle adjusting screw 15 so that the idle adjusting screw 15 is moved in the horizontal direction. The throttle valve 13 is moved in the vertical direction by moving the throttle valve 13 in the vertical direction. On the other hand, since the throttle valve 13 is movably arranged in the throttle valve guide cylinder 12, the throttle valve 13 is arranged in the throttle valve guide cylinder 12 with a gap. According to the above description, the throttle valve 13 is disposed in a state of being inclined in the throttle valve guide cylinder 12 when the throttle valve 13 is at the idling opening degree where the tip 15A of the idle adjustment screw 15 is in contact with the inclined surface 13A of the throttle valve 13. Is done. This is because a gap exists between the throttle valve 13 and the throttle valve guide cylinder 12 as described above. Further, the tip 15A of the idle adjustment screw 15 comes into contact with the inclined surface 13A of the throttle valve 13, and the throttle valve 13 is obliquely pressed.

According to the above, the contact between the outer periphery of the throttle valve 13 and the inner periphery of the throttle valve guide cylinder 12 is made partially, and the contact pressure may increase to cause abrasion, To solve this problem, the degree of freedom in selecting the material of the throttle valve 13 is limited, and it is necessary to perform expensive coating treatment.

When the throttle valve 13 is released from the idling opening, the throttle valve 13 is set to the idle adjusting screw 15.
, The pressing force on the inclined surface 13A is released. As described above, when the throttle valve 13 is returned from the free state in which the throttle valve 13 is opened to the idling opening degree again, the inclination state of the throttle valve 13 at the idling opening degree may change compared to the original inclination state. is there. According to the above, there is a difference in the relative positional relationship between the throttle valve 13 and the bypass hole determined in accordance with the idling opening state, and the reproducibility of low-speed fuel is impaired.

[0006] The present invention has been made in view of the above problems,
A main object of the present invention is to provide an idling adjustment device for a sliding throttle valve carburetor that can achieve improvement in sliding durability of a throttle valve and improvement in reproducibility of low-speed fuel.

[0007]

According to the present invention, in order to achieve the above object, a throttle valve guide cylinder is connected to an intake passage penetrating a carburetor body. In a sliding throttle valve type carburetor in which an intake path is opened and closed by a throttle valve movably arranged in a throttle valve guide cylinder, a top cover for closing an upper opening of the throttle valve guide cylinder is provided with a throttle valve guide cylinder. Is screwed onto a male screw formed along the longitudinal direction of the throttle valve guide cylinder at the outer periphery of the throttle valve guide cylinder, and a guide cylinder formed at the center thereof is downwardly directed from the upper end of the guide cylinder. A holder member sliding hole is formed, and an end insertion hole is formed to penetrate downward from the holder member sliding hole via the locking step, while the connecting member has a throttle valve at its lower end. The end is locked to the A holder member which is slidably disposed in the inside and abuts against the locking step and has a wire end hole formed therein for locking the wire end of the accelerator wire. The end of the connecting member is engaged with a throttle valve. Stop, dispose the holder member movably in the holder member sliding hole, lock the wire end of the accelerator wire to the holder member via the wire end hole, abut the holder member on the locking step, The first feature is that the idling opening of the throttle valve is adjusted by screwing the cover.

According to the present invention, in addition to the first feature, the end of the connecting member, the holder member, and the wire end of the accelerator wire are arranged on a longitudinal axis passing through the center of the cross section of the sliding throttle valve. This is a second feature.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an idling adjusting device for a sliding throttle valve type carburetor according to the present invention will be described below with reference to FIG. Reference numeral 1 denotes a carburetor body through which an intake passage 2 penetrates, and a throttle valve guide cylinder 3 is continuously provided upward from the intake passage 2. The upper part of the throttle valve guide cylinder 3 is opened with an upper opening 3A, and a male screw 3B is formed on the outer periphery of the upper part of the throttle valve guide cylinder 3 along the longitudinal direction of the throttle valve guide cylinder 3. A throttle valve 4 is movably arranged in the throttle valve guide cylinder 3, and the intake passage 2 is opened and closed by moving the throttle valve 4 in the vertical direction.

Reference numeral 5 denotes a top cover for closing the upper opening 3A of the throttle valve guide cylinder 3, and has a bottomed cylindrical shape composed of a cylindrical portion 5A and a bottom portion 5B. And the cylindrical part 5 of the top cover 5
A female screw 5C screwed to the male screw 3B is formed inside A, and a guide cylinder 5D is formed at the center of the bottom 5B. The guide cylinder 5D has a holder member sliding hole 5F.
And the locking step 5E and the end insertion hole 5G are provided continuously. Specifically, the holder member sliding hole 5F is formed by drilling from the upper end 5H of the guide cylinder 5D to the lower locking step 5E, and further extending from the locking step 5E to the lower end 5J.
G is drilled through. The diameter of the end insertion hole 5G is formed to be smaller than the diameter of the holder member sliding hole 5F, and the step corresponding to the difference in the diameter forms the locking step 5E. That is, the holder member sliding hole 5F is opened at the upper end 5H of the guide cylinder 5D, and the end insertion hole 5G is opened at the lower end 5J.

Reference numeral 6 denotes a connecting member having an end 7 below and a holder member 8 above. The end 7 has a cylindrical shape, and has a diameter smaller than the diameter of the end insertion hole 5G so that it can pass through the end insertion hole 5G of the guide cylinder portion 5D. or,
The holder member 8 has a diameter capable of slidably moving in the holder member sliding hole 5F and has a cylindrical shape, into which a wire end 14 arranged at an end of the accelerator wire W is inserted. Wire end hole 8A that can be locked
And a wire end locking step 8B.

Reference numeral 9 denotes an end locking member screwed to the inner bottom portion 4A of the throttle valve 4. The end locking member 9 includes a flange portion 9A, a screw portion 9B extending below the flange portion 9A, and a flange portion. 9A
An end hole 9D into which the end 7 of the connecting member 6 can be inserted and locked, and an end locking step 9E are formed inward of the locking cylinder 9C extending upward. .

Next, the assembly of the sliding throttle type vaporizer according to the present invention will be described. Referring to FIG. 2, the first
The wire end 14 of the accelerator wire W is inserted and arranged in the wire end hole 8A of the holder member 8, and the wire end 14 in the wire end hole 8A is engaged with the wire end engaging step 8B.

Second, the connecting member 6 is inserted downward from the upper end 5H opening of the holder member sliding hole 5F.
The end 7 is disposed below the end insertion hole 5G via the holder member sliding hole 5F and the locking step 5E, while the holder member 8 having the wire end 14 is disposed in the holder member sliding hole 5F. , The lower end 8C of which is a locking step 5E.
Abut.

Third, the end 7 of the connecting member 6 is connected to the throttle valve 4
The end 7 is arranged in the end hole 9D of the end engaging member 9 and the end 7 is engaged with the end engaging step 9E. At the time of the third assembly, the spring S is contracted between the bottom 5B of the top cover 5 and the inner bottom 4A of the throttle valve 4.

As described above, the accelerator wire W and the throttle valve 4 are connected via the connecting member 6, and the throttle valve 4 is connected to the end 7 of the connecting member 6 via the end locking member 9, Wire end 14 of wire W
Was connected to the holder member 8 of the connecting member 6.

The throttle valve 4 in the above-described state is disposed in the throttle valve guide cylinder 3, and a female screw 5 C of the top cover 5 is screwed to a male screw 3 B formed on the upper outer periphery of the throttle valve guide cylinder 3. This state is shown in FIG. 1. In this state, the lower end 8C of the holder member 8 of the connecting member 6 comes into contact with the locking step 5E of the top cover 5, whereby the minimum opening of the throttle valve 4 is determined. Is done.

The idling opening, which is the minimum opening of the throttle valve 4, is adjusted for each engine to which the carburetor is attached. This idling opening is adjusted by the top cover 5.
Is carried out by screwing. That is, when the screw is formed with a right-handed screw, by rotating the top cover 5 clockwise, the locking step portion 5E formed integrally with the top cover 5 moves downward, and the throttle valve 4 is opened. The degree can be controlled to close. On the other hand, by rotating the top cover 5 in the counterclockwise direction, the locking step 5E can be moved upward to control the opening of the throttle valve 4 to open. Therefore, a desired idling opening can be obtained by rotating the top cover 5.

According to the idling adjusting device for a sliding throttle valve carburetor according to the present invention, an adjusting portion for adjusting the opening degree of the throttle valve 4 is provided with a locking step portion 5E provided on the top cover 5.
And the lower end 8C of the holder member 8 of the connecting member 6, so that no inclined force is applied to the throttle valve 4 and the throttle valve 3 can always be kept in an upright state. Accordingly, the throttle valve 4 slides while uniformly abutting on the throttle valve guide cylinder 3, and the increase in the surface pressure at the contact portion can be suppressed. The degree of freedom can be increased, and no expensive coating treatment is required, which is effective in reducing the manufacturing cost of the vaporizer.

Further, when the throttle valve 3 is opened and closed in the upright state, the throttle valve 3 always returns to the set idling position, and always maintains the relative position with the bypass hole accurately. In particular, the reproducibility of low-speed fuel can be improved.

As shown in FIG. 1, the end 7 and the holder member 8 of the connecting member 6 and the accelerator wire W
Is arranged on the longitudinal axis XX passing through the center of the throttle valve 4, an operating force can be applied to the center of the throttle valve 4 and the wire end 14 extends along the longitudinal direction of the throttle valve 4. This allows the throttle valve 4 to maintain a better erected state without being tilted to one side, thereby improving the sliding durability of the throttle valve 4 and reproducibility of low-speed fuel. It has been further improved.

S1 and S2 are springs for pressing the top cover 5 to one side so that the top cover 5 does not bulge due to vibration, so that after the top cover 5 is set, the top cover 5 rotates. Unnecessary change of the idling opening can be suppressed.

[0023]

According to the idling adjusting device for a sliding throttle valve type carburetor according to the present invention, a holder member sliding hole is formed in a guide cylindrical portion of a top cover screwed on an upper portion of a throttle valve guiding tube. An end insertion hole that opens downward through the stop portion is provided, while the connecting member has an end at its lower end,
At the upper end, a holder member slidably disposed in the holder member sliding hole and having a wire end hole is provided, the end of the connecting member is locked to the throttle valve, and the holder member is connected to the holder member sliding hole. Idling of the throttle valve by arranging the wire end of the accelerator wire to the holder member through the wire end hole, contacting the holder member with the locking step, and screwing the top cover Since the opening is adjusted, the throttle valve can be kept in an upright state when the throttle valve is idling,
This improves the sliding durability of the throttle valve and the reproducibility of low-speed fuel. Further, according to the arrangement of the end of the connecting member, the wire end of the holder member and the wire end of the accelerator wire on the longitudinal axis passing through the center of the throttle valve, the operating force is set at the center of the throttle valve and along the longitudinal direction of the throttle valve. , The erectability of the throttle valve can be further improved, and the above effect can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an idling device of a sliding throttle valve type carburetor according to the present invention.

FIG. 2 is a longitudinal sectional view showing a connection state of a throttle valve and a wire end to a connection member.

FIG. 3 is a longitudinal sectional view showing an idling device of a conventional sliding throttle valve type carburetor.

[Explanation of symbols]

 3 Throttle valve guide cylinder 4 Throttle valve 5 Top cover 5D Guide cylinder part 5E Locking step part 5F Holder member sliding hole 5G End insertion hole 6 Connecting member 7 End 8 Holder member 8A Wire end hole 14 Wire end

Claims (2)

[Claims] 1. A sliding throttle valve type in which a throttle valve guide cylinder is connected to an intake passage penetrating a carburetor body, and the intake passage is opened and closed by a throttle valve movably disposed in the throttle valve guide cylinder. In the carburetor, a top cover 5 for closing the upper opening 3A of the throttle valve guide cylinder 3 is screwed onto a male screw 3B formed on the outer periphery of the throttle valve guide cylinder 3 and formed along the longitudinal direction of the throttle valve guide cylinder 3. At the same time, a holder member sliding hole 5F is formed in the guide tube portion 5D formed at the center of the guide tube portion 5D downward from the upper end 5H of the guide tube portion 5D. An end insertion hole 5G is formed to penetrate downward through a locking step 5E from the front end, while the connecting member 6 has an end 7 locked at the lower end by a throttle valve, and a holder at the upper end. The locking step 5E is slidably disposed in the member sliding hole 5F. And a holder member 8 having a wire end hole 8A formed therein for engaging the wire end 14 of the accelerator wire W. The end member 7 of the connecting member 6 is locked to the throttle valve 4, and the holder member 8 is provided.
Is movably arranged in the holder member sliding hole 5F, and the wire end 14 of the accelerator wire W is locked to the holder member 8 via the wire end hole 8A, and the holder member 8 is brought into contact with the locking step 5E. An idling adjustment device for a sliding throttle valve type carburetor in which the idling opening of the throttle valve 4 is adjusted by screwing a top cover 5. 2. The end 7 of the connecting member 6, the holder member 8, and the wire end 14 of the accelerator wire W.
2. The idling adjusting device for a sliding throttle valve type carburetor according to claim 1, wherein is disposed on a longitudinal axis XX passing through the center of the throttle valve 3.