JPH05949U - Plate-shaped sliding throttle valve type carburetor - Google Patents

Abstract

(57) [Abstract] [Purpose] To maintain the air volume without impairing the sliding property of the sliding throttle valve of the plate-type sliding throttle valve vaporizer. [Structure] The sliding throttle valve 17 is a carburetor main body 12 on the downstream side.
The rotatable bearing 19 rolls over the carburetor body 12 smoothly. A ring-shaped sealing member 20 is formed on the side surface of the bearing 19 on which the bearing 19 is attached, in an annular state surrounding the inlet of the intake passage 14. This seal member 20
Since the resin is used, or one side of the resin or fluorine-coated ceramic or metal is pressed by the spring 22 toward the sliding throttle valve 17, the airtightness is good.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is used in a carburetor that supplies and controls an air-fuel mixture to an engine. Regarding the throttle valve that controls the amount of air supplied to the Ensures the slidability of the sliding throttle valve of a plate-type sliding throttle valve type carburetor that slides via rotating means. In addition, a plate-shaped slide that maintains the airtightness between the sliding throttle valve and the carburetor body A dynamic throttle valve type carburetor.

[0002]

[Prior art]

  Conventionally used sliding throttle valve type carburetor is connected to the intake passage that penetrates the carburetor body. And a throttle valve guide cylinder that opens upward is provided, and the slide throttle valve is installed in the slide throttle valve guide cylinder. It is slidably arranged so that it can reduce the intake air resistance of the intake passage. A plate-shaped sliding throttle valve is used. This plate-shaped sliding throttle valve There is a drawback that the movement becomes heavy due to dust clogging.

[0003]   In order to solve this drawback, for example, it is disclosed in JP-A-62-199953. Attach the rotating means such as bearings and rollers to the sliding throttle valve to To ensure smooth operation, and to ensure airtightness between the sliding throttle valve and the carburetor body. In order to maintain it, the sliding throttle valve is composed of two pieces, a main throttle valve and a sub throttle valve. The valve is placed in the intake passage on the engine side, and the intake passage negative pressure generated on the engine side is placed behind the auxiliary throttle valve. In addition, the suction force of the sub-throttle valve to the engine side is reduced and the throttle valve is made to slide. Things are offered. In this way, the auxiliary throttle valve is placed on the downstream side (engine side) of the intake flow. By being sucked and attracted to the carburetor body, leakage is prevented and airtightness is improved. I keep it.

[0004]

[Problems to be solved by the device]

  However, if the sliding throttle valve is composed of two pieces, the main throttle valve has a rotating means. , The movement is smooth, but the auxiliary throttle valve is brought closer to the carburetor body by the negative pressure of the intake air. In particular, at a low opening, the suction negative pressure is large and the suction force of the auxiliary throttle valve is strong, so it is airtight. Good, but requires a certain amount of throttle valve return force. In addition, the double diaphragm has a complicated structure. Since it is a valve, the auxiliary throttle valve vibrates due to intake pulsation, and a tapping sound is likely to occur.

[0005]   The present invention has been made in view of the above points, and includes rotating means such as bearings and rollers. The sliding property of the sliding throttle valve is ensured by using the Maintains airtightness with the main body and sets an accurate air-fuel mixture flow rate especially at low opening To provide a plate-type sliding throttle valve type carburetor that can be used and has improved tapping countermeasures It is a thing.

[0006]

[Means for Solving the Problems]

  In order to achieve the above object, the present invention uses rotating means such as bearings and rollers. In addition, in the plate-type sliding throttle valve type carburetor, the intake passage is enclosed in the gap between the sliding throttle valve and the main body. Arrange a ring-shaped sealing member to loosen, and insert it gently into the groove of the carburetor body. A spring is inserted between the valve member and the carburetor body and pressed against the throttle valve, A labyrinth is formed on the contact surface between the body and the ring-shaped seal member for slow insertion and It retains sex.

[0007]

[Action]

  In the present invention, a gap is created by using the rotating means for operating the sliding throttle valve. , A ring-shaped seal member is arranged, and the seal member is In addition, since a certain pressing force is applied by the spring force and it can slide, Since a labyrinth is formed on the main body, leakage can be reduced, so between them The airtightness of can be maintained.

[0008]

【Example】

  FIG. 1 is a longitudinal sectional view of a main part of a plate-type sliding throttle valve type carburetor according to the present invention, and FIG. FIG. The air funnel 10 and the carburetor bodies 11 and 12 have the same axis. Intake passages 13 and 14 are formed in the direction.

[0009]   The carburetor main body 11 and the carburetor main body 12 are integrally configured as separate pieces. Because it is easy to do, after processing, it is assembled and the O-ring 15 prevents leakage In the example in which the passage is formed, it is functionally the same as the one piece.

[0010]   A space 16 is formed which vertically crosses the intake passages 13 and 14, and the space 16 is formed. A plate-shaped sliding throttle valve 17 is mounted inside. This sliding throttle valve 17 is an actuator (not shown). It slides in the space 16 in conjunction with the cell to open and close the intake passages 13 and 14. is there.

[0011]   Both sides of the intake passage on the wall surface of the sliding throttle valve 17 facing the carburetor body 12 Two parallel grooves 18 are formed on the side edges, and a plurality of bare grooves are formed in each groove 18. A ring 19 is attached. In the figure, the left side of the intake passage is from the air cleaner. The upstream side of the intake air is connected, and the right side is the downstream side of the engine.

[0012]   Therefore, since the sliding throttle valve 17 is brought closer to the carburetor main body 12 on the downstream side, A rotatable bearing 19 rolls on the carburetor body 12 for smooth operation. .

[0013]   At the bearing mounting side wall surface of the sliding throttle valve 18, the inlet of the intake passage 14 A ring-shaped seal member 2 made of a material excellent in operability and durability in an annular state surrounding the Form 0. As a material of the ring-shaped seal member 20 that satisfies these requirements, , Resin (eg fluorine-based), or fluorine-coated ceramic or Metal is suitable. The ring-shaped seal member 20 is a circular groove portion 21 of the carburetor body. It is loosely inserted into the bottom of the groove 21 (between the sliding throttle valve 17 and the carburetor body 12). , The intervening spring 22 constantly presses the sliding throttle valve 17 side with a stable force. To do.

[0014]   Further, as shown in an enlarged scale in FIG. 3, the outer peripheral surface of the ring-shaped seal member 20 is Since the labyrinth 23 is formed, the airtightness with the carburetor main body 12 is also good.

[0015]   Further, in FIG. 4, a labyrinth 24 is also formed on the inner peripheral surface of the ring-shaped seal member 20. This is an example that is made, and higher airtightness can be obtained.

[0016]

[Effect of device]

  As described above, according to the plate-shaped sliding throttle valve type carburetor according to the present invention, bearings and In the gap formed by the rotation means such as rollers protruding from the sliding throttle valve, A labyrinth is provided on at least one of the outer and inner circumferences of the ring-shaped seal member. The sliding throttle valve is pressed by a spring.

[0017]   Therefore, the sliding wall and the wall surface of the carburetor body on the side where the rotating means is mounted are different from the conventional ones. Since there is no gap between the valve and the valve, airtightness can be maintained and mixture leakage can be eliminated. Therefore, it is possible to obtain the flow rate stability particularly at a low opening degree.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a plate-shaped sliding throttle valve type carburetor according to the present invention.

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

3 is a partially enlarged view of FIG.

FIG. 4 is a diagram showing another embodiment of FIG.

[Explanation of symbols]

11 Vaporizer body 12 Vaporizer body 13 Intake passage 14 Intake passage 17 Sliding throttle valve 19 Laura 20 Ring-shaped sealing member 22 spring 23 Labyrinth 24 Labyrinth

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Creator Gotetsu Namiki             91324, California, United States             Slippers, Mikuni and Avenyu 8910 Mi             Inside Kuni American Corporation

Claims (2)

[Scope of utility model registration request] 1. A carburetor main body is provided with an intake passage, and a plate-like sliding throttle valve for opening and closing the intake passage is slidably attached to the carburetor main body, and sliding friction is reduced at the sliding portion. The rotary member is arranged in a gap between the carburetor main body and the side surface of the sliding throttle valve on the engine side, and is attached to either one, 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 sealing member is loosely inserted into the carburetor main body via a spring and slidably pressed against the sliding throttle valve. Sliding throttle valve type 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 groove inner wall surface of the carburetor body into which the ring-shaped seal member is loosely inserted. Plate-shaped sliding throttle valve type carburetor.