JP2525242Y2 - Plate-shaped sliding throttle type vaporizer - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention supplies an air-fuel mixture to an engine,
A plate-shaped sliding throttle valve, which is used in a controlled carburetor and controls the amount of air supplied to the engine from the carburetor, in which a plate-shaped sliding throttle valve slides through rotating means such as a bearing. The present invention relates to a plate-shaped sliding throttle valve type carburetor in which the sliding throttle valve of a carburetor secures the slipperiness while maintaining the airtightness between the sliding throttle valve and the carburetor body.

[0002]

2. Description of the Related Art A conventionally used sliding throttle valve type carburetor is provided with a throttle valve guide cylinder which is connected to an intake passage penetrating a carburetor body and which opens upward. In order to reduce the intake air resistance of the intake passage, a sliding throttle valve having a plate shape is used. This plate-shaped sliding throttle valve has a drawback that its movement becomes heavy due to dust clogging or the like.

In order to solve this drawback, for example, as shown in Japanese Patent Application Laid-Open No. 62-199953, a rotating means such as a bearing or a roller is mounted on a sliding throttle valve to smoothly perform a sliding operation. In order to maintain airtightness between the sliding throttle valve and the carburetor body, the sliding throttle valve is constituted by two pieces of a main throttle valve and a sub-throttle valve, and the sub-throttle valve is an engine. The negative pressure of the intake path generated on the engine side is applied to the back of the sub-throttle valve to reduce the suction force of the sub-throttle valve to the engine side, and the throttle valve is slid. Things are provided. As described above, the sub-throttle valve is drawn to the downstream side (the engine side) of the intake air flow and is drawn to the carburetor body, thereby preventing leakage and maintaining airtightness.

[0004]

However, when the sliding throttle valve is composed of two pieces, the movement of the main throttle valve is smooth because of the rotation of the main throttle valve. It is brought close to the main body, and especially at a low opening, the suction negative pressure is large and the auxiliary throttle valve has a strong attraction force. Also,
Due to the double throttle valve having a complicated structure, the sub-throttle valve vibrates due to intake pulsation, and a tapping sound is easily generated.

The present invention has been made in view of the above points, and secures the sliding property of a sliding throttle valve by using a rotating means such as a bearing or a roller, and also establishes a connection between the sliding throttle valve and a carburetor body. An object of the present invention is to provide a plate-shaped sliding throttle valve type carburetor which can maintain an airtightness between them, and in particular, can set an accurate mixture flow rate at a low opening degree and improve a countermeasure against tapping noise.

[0006]

In order to achieve the above object, the present invention provides a plate-shaped sliding throttle valve carburetor using a rotating means such as a bearing or a roller. , A ring-shaped seal member surrounding the intake passage is arranged, loosely inserted into the groove of the carburetor main body, a spring is inserted between the ring-shaped seal member and the carburetor main body, and pressed against the throttle valve. A labyrinth is formed on the loosely slidable contact surface between the main body and the ring-shaped seal member to maintain their airtightness.

[0007]

In the present invention, a ring-shaped seal member is disposed in a gap formed by using the rotating means for operating the sliding throttle valve, and the seal member is provided with a spring for the sliding throttle valve. Since a certain pressing force is applied to the carburetor for sliding, and a labyrinth is formed on the carburetor body, the leakage can be reduced, so that the airtightness between them can be maintained.

[0008]

1 is a longitudinal sectional view of a main part of a plate-type sliding throttle type vaporizer according to the present invention, and FIG. 2 is a transverse sectional view of the same. In the air funnel 10 and the carburetor bodies 11, 12, intake passages 13, 14 are formed in the same axial direction, respectively.

Although the carburetor body 11 and the carburetor body 12 are integrally formed as separate pieces, an example in which a leak-free intake passage is formed by the O-ring 15 after processing because of easy processing. In terms of function, it is no different from a one-piece configuration.

A space 16 vertically crossing the intake passages 13 and 14 is formed, and a plate-shaped sliding throttle valve 17 is mounted in the space 16. The sliding throttle valve 17 slides in the space 16 in conjunction with an accelerator (not shown), and
3, 14 are opened and closed.

Two parallel grooves 18 are formed on both sides of the wall of the sliding throttle valve 17 facing the carburetor body 12 across the intake passage, and a plurality of grooves 18 are formed in each groove 18. Is mounted. In the drawing, the left side of the intake passage is the intake upstream side connected to the air cleaner, and the right side is the downstream side connected to the engine.

Therefore, since the sliding throttle valve 17 is brought close to the carburetor main body 12 on the downstream side, the rotatable bearing 19 rolls on the carburetor main body 12, and a smooth operation can be performed.

On the side wall surface of the sliding throttle valve 18 on which the bearing is mounted, an annular state surrounding the inlet of the intake passage 14 is formed.
The ring-shaped seal member 20 made of a material having excellent operability and durability is formed. As a material of the ring-shaped seal member 20 satisfying these requirements, a resin (for example, fluorine-based), or a fluorine-coated ceramic or metal is suitable. This ring-shaped sealing member 20
The groove 21 is loosely inserted into the circular groove 21 of the vaporizer body.
(Between the sliding throttle valve 17 and the carburetor body 12) at the bottom thereof by an intervening spring 22 to constantly press the sliding throttle valve 17 with a stable force.

Further, as shown in an enlarged manner in FIG. 3, a labyrinth 23 is formed on the outer peripheral surface of the ring-shaped seal member 20, so that the hermeticity with the carburetor body 12 is good.

FIG. 4 shows this ring-shaped sealing member 20.
This shows an example in which the labyrinth 24 is also formed on the inner peripheral surface of the device, and higher airtightness can be obtained.

[0016]

As described above, according to the plate-type sliding throttle valve carburetor according to the present invention, the ring is formed in the gap formed by the rotating means such as bearings and rollers projecting from the sliding throttle valve. A labyrinth is formed on at least one of the outer periphery and the inner periphery through the seal member, and the sliding throttle valve is pressed by a spring.

Therefore, there is no gap between the wall surface of the carburetor body on the side where the rotating means is mounted and the sliding throttle valve as in the prior art, and it is possible to maintain airtightness and eliminate leakage of air-fuel mixture. In particular, flow stability at a low opening can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a plate-shaped sliding throttle type vaporizer according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a plate-shaped sliding throttle valve carburetor according to the present invention.

FIG. 3 is a partially enlarged view of FIG. 1;

FIG. 4 is a view showing another embodiment of FIG. 3;

[Description of Signs] 11 carburetor body 12 carburetor body 13 intake passage 14 intake passage 17 sliding throttle valve 19 roller 20 ring-shaped seal member 22 spring 23 labyrinth 24 labyrinth

 ──────────────────────────────────────────────────続 き Continuing on the front page Examiner Naoki Iizuka (56) References Jikaichi Sho 61-80349 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] An intake passage is formed in a carburetor main body, and a plate-shaped sliding throttle valve for opening and closing the intake passage is slidably mounted on the carburetor main body, and sliding friction is reduced on a sliding portion thereof. The rotating member is disposed in a gap between the carburetor body and the engine-side side surface of the sliding throttle valve, and is attached to one of them, and a ring-shaped seal member surrounding the opening of the intake passage is interposed in the gap. A plate-shaped sliding throttle valve type carburetor, wherein the ring-shaped seal member is loosely inserted into a carburetor body via a spring and formed so as to slidably press against the sliding throttle valve. Sliding throttle valve carburetor. 2. A labyrinth is formed on at least one of the outer peripheral surface and the inner peripheral surface of the ring-shaped seal member facing the inner wall surface of the groove portion of the carburetor body into which the ring-shaped seal member is loosely inserted. Plate-shaped sliding throttle valve type vaporizer.