JPH089407Y2 - Carburetor rotary bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vaporizer for controlling the concentration and amount of an air-fuel mixture supplied to an engine, and in particular, the opening area of an intake passage that penetrates the vaporizer body. The present invention relates to a rotary bearing device that supports a butterfly valve that controls a valve.

[Conventional technology]

A rotary bearing device for a carburetor which is generally used in the past will be described with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating the inside thereof, and a rotary shaft 3 is rotatably supported by the carburetor main body 1 across the intake passage 2.

Specifically, bearing holes 4A and 4B having a diameter slightly larger than the outer diameter of the rotary shaft 3 are formed so as to face each other on both sides of the intake passage 2, and the bearing holes 4A and 4B are provided with holes of the rotary shaft 3 respectively. Both ends are rotatably supported.

Reference numeral 5 is a throttle valve fixed to the rotary shaft 3 to control the opening and closing of the intake passage 2, and corresponds to a throttle valve for controlling the air-fuel mixture amount or a choke valve for controlling the air amount. Further, an operation lever 6 is attached to an end portion of the rotary shaft 3 projecting from the carburetor main body 1, and turning power is applied to the rotary shaft 3 via the operation lever 6.

Reference numeral 7 is a spring that applies a rotational force in a fixed direction to the rotary shaft 3, one end of which is locked to the carburetor main body 1 and the other end of which is locked to the operation lever 6.

1 shows a bearing state (twice the diameter of the rotary shaft 3) in which the bearing length (L1) of the rotary shaft 3 of the bearing hole 4B on one side is relatively short, and FIG. Bearing condition that the bearing length (L2) of the other bearing hole 4B is relatively long (5 times the diameter of the rotating shaft 3)
Indicates.

[Problems to be solved by the device]

The conventional rotary bearing device for the carburetor has the following disadvantages.

First, in the bearing shown in FIG. 1 in which the bearing length (L1) of the rotary shaft 3 of the bearing hole 4B is relatively short, the rotary shaft is located between the inner diameter of the bearing hole 4B and the outer diameter of the rotary shaft 3. There is a gap in order to facilitate the rotation of 3, but when an operating force is applied to the operation lever 6, the gap causes the rotating shaft 3 to tilt and fall. This is because the rotating shaft 3 is held by the bearing support portion for a short distance in the bearing hole 4B.

According to this, a part of the bearing hole 4B comes into contact with the outer periphery of the rotary shaft 3, so that this contact portion may be worn during long-term use. There is a disadvantage that air flows into the passage 2 and it is difficult to accurately control the air amount by the throttle valve 5.

However, because the bearing length (L1) of the rotating shaft 3 of the bearing hole 4B is short, the contact area between the inner surface of the bearing hole 4B and the outer periphery of the rotating shaft 3 is small, so that, for example, water or seawater is present in this gap. Easier to get into.

Bearing length of the rotating shaft 3 of the bearing hole 4B shown in FIG. 2 (L
In the case of the bearing 2) having a relatively long length, the tilt of the rotary shaft 3 when the operating force is applied to the operating lever 6 is smaller than that of the former. This is because even if the gap between the rotary shaft 3 and the bearing hole 4B is the same as the former, the length of the bearing support portion can be increased.

However, since the contact area between the inner surface of the bearing hole 4B and the rotating shaft 3 is larger than that of the former, water that once entered the gap between the inner surface of the bearing hole 4B and the outer peripheral surface of the rotating shaft 3 or the escape of seawater to the outside. May get worse.

[Means for solving the problem]

The rotary bearing device of the carburetor according to the present invention has been made in view of the above, and even when it is used for a long period of time, there is no uneven wear of the bearing hole, and liquid such as water or seawater is generated between the bearing hole and the rotating shaft. It is to obtain a rotary bearing device of a carburetor which easily discharges the liquid from a bearing hole even if it intrudes into the space, and in order to achieve the above object, an intake passage passing through the carburetor main body has a rotary shaft traversing the intake passage. In the rotary bearing device of the carburetor, which is rotatably supported by the one-side bearing hole and the other-side bearing hole that are bored on both sides of the carburetor main body across the intake passage, at least the longitudinal axis of the other-side bearing hole A loose fitting portion that does not come into contact with the outer circumference of the rotary shaft is provided at a substantially middle portion of the core wire XX, and a drainage groove communicating with the atmosphere is provided at a lower position over substantially the entire length of the loose fitting portion to prevent the rotary shaft from rotating. Rotation is performed by the intake passage side bearing hole and the outer bearing hole formed in the side bearing hole and the other side bearing hole. The operation lever is attached to a rotary shaft that is pivotally supported at present and protrudes from the end of the outer bearing hole.

〔Example〕

An embodiment of a rotary bearing device for a carburetor according to the present invention will be described below with reference to FIG. The same parts as those of the conventional structure are designated by the same reference numerals and the description thereof will be omitted.

10A and 10B are bearing holes bored on both sides of the carburetor body 1 with the intake passage 2 in between, 10A being one side bearing hole bored in one side, and 10B being formed in the other side. This is the other side bearing hole. For example, the diameter D1 of the bearing holes 10A and 10B is (the diameter (d) of the rotary shaft 3 + 0.1 mm).

Then, at least one of the bearing holes 10A, 10B has a relatively long bearing length (L3).

In the present embodiment, the bearing length (L
3) was set to 5 times the diameter (d) of the rotating shaft 3.

The other side bearing hole 10B is provided with a loose fitting portion 10C having a sufficiently large diameter without coming into contact with the outer diameter of the rotary shaft 3 at an intermediate portion of the longitudinal axis XX of the bearing hole 10B. For example, the diameter D2 of the loose fitting portion 10C is (the diameter (d) of the rotary shaft 3 + 6 mm).

Therefore, in the other side bearing hole 10B, the rotating shaft 3 is not
Both sides of 0C, specifically, intake passage side bearing hole 10D and outer bearing hole 1
It is rotatably supported by 0E, and is not rotatably supported by the loose fitting portion 10C.

Then, in the loose fitting portion 10C, over substantially the entire length of the loose fitting portion 10C,
In addition, a drainage groove 20 that opens downward is formed.

Further, in the present embodiment, the outer bearing hole 10E is formed by press-fitting a bearing collar made of a synthetic resin material which is lightweight and easy to mold. Therefore, the rotary shaft 3 has a bearing hole 10A on one side and a bearing hole on the intake passage side formed in the bearing hole 10A on the other side.
It is rotatably supported by three bearing holes 10D and an outer bearing hole 10E.

According to the rotary bearing device of the carburetor, the operating lever 6
In the state in which the rotating shaft 3 is rotated, a unidirectional biasing force acts on the rotating shaft 3, so that the rotating shaft 3 tilts and tilts particularly in the bearing hole. Since the rotary shaft 3 is supported by the intake passage side bearing hole 10D and the outer bearing hole 10E of the other side bearing hole 10B having (L3), the tilt of the rotary shaft 3 in the bearing hole can be largely suppressed.

According to this, since it is possible to prevent contact between a part of the bearing hole and the outer circumference of the rotary shaft 3, it is possible to effectively suppress wear at the contact portion even during long-term use.
The air does not flow into the intake passage 2 and the throttle valve 5 can accurately control the air amount for a long period of time.

Further, in the outer bearing hole 10E located outside the carburetor body 1, since the bearing length is relatively short, water or the like enters through the bearing portion toward the loose fitting portion 10C. Although it is easy, the water that has entered the loose fitting portion 10C is immediately discharged to the outside from the water drain groove 20, and therefore is not affected by this water.

Although the carburetor body 1 has one side bearing hole 10A and the other side bearing hole 10B on both sides of the intake passage 2 as described above,
The loose fitting portion 10C is preferably provided in a bearing hole on the side of the operation lever 6 attached to the rotary shaft 3. This is because the generation of an eccentric load on the rotary shaft 3 due to the turning operation of the operation lever 6 greatly affects the bearing hole on the operation lever 6 side.

The loose fitting portion 10C may be provided in the bearing holes on both sides.

[Effect of device]

As described above, according to the rotary bearing device of the carburetor of the present invention, the following effects can be obtained.

When the operating lever was rotated, the rotating shaft could be supported by the bearing hole with a sufficient bearing length, so the falling of the rotating shaft could be suppressed and the bearing hole could be unevenly worn even during long-term use. As a result, air hardly flows in through the bearing hole.

Therefore, it is possible to accurately control the air amount by the throttle valve for a long period of time.

Since the water drain groove communicating with the atmosphere is formed in the lower position over substantially the entire length of the loose fitting portion, water that has temporarily entered the loose fitting portion can be immediately discharged to the outside of the vaporizer.

[Brief description of drawings]

1 and 2 show a conventional rotary bearing device for a carburetor, in which FIG. 1 is a longitudinal sectional view showing an example of a relatively short bearing length, and FIG. 2 is a comparison of bearing lengths. It is a longitudinal cross-sectional view showing an extremely long example. FIG. 3 is a vertical sectional view showing an embodiment of a rotary bearing device for a carburetor according to the present invention. 1 carburetor body 2 ...... Intake passage 3 ...... Rotating shaft 10A …… One side bearing hole 10B …… Other side bearing hole 10C …… Free fitting part 10D …… Intake passage side bearing hole 10E …… Outside bearing hole A: Bearing collar 20: Water drain groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 54-11230 (JP, U) Actual 61-181840 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A one-side bearing hole 10A in which an intake passage 2 penetrating the carburetor main body 1 is provided with a rotary shaft 3 traversing the intake passage on both sides of the carburetor main body 1 with the intake passage 2 interposed therebetween. Other side bearing hole 10B
In a rotary bearing device of a carburetor that is rotatably supported by a free fitting portion 10C that does not contact the outer periphery of the rotary shaft 3 at least approximately in the middle of the longitudinal axis XX of the other bearing hole 10B.
And a drainage groove 20 communicating with the atmosphere is provided at a lower position over substantially the entire length of the loose fitting portion 10C, and the rotary shaft 3 is formed with the one side bearing hole 10A and the other side bearing hole 10B. Ten
D, a rotary bearing device for a carburetor, which is rotatably supported by an outer bearing hole 10E, and an operating lever 6 is attached to the rotary shaft 3 protruding from the outer bearing hole 10E and the end.