JPH02149755A - Carburetor - Google Patents

Abstract

PURPOSE:To facilitate the production of various carburetors by modifying a relative angle formed by fixing end parts of a mixing body to a carburetor body and a float chamber body in the carburetor composed of the carburetor body, the mixing body providing with a float chamber recess and the float chamber body. CONSTITUTION:A carburetor is composed of a carburetor A, a mixing body B and a float chamber body C. Fixing parts 4, 5 of the mixing body B on the sides of the carburetor body and of the float chamber body form a relative angle alpha. A passing through hollow 9 is opened with the first passage 11 containing a needle jet 13 positioned in a direction rectangular to the fixing part 4 on the side of the carburetor body, and the second passage 12, which about rectangularly intersects a fixing part 5 on the side of the float chamber body, is connected to the first passage 11. Thus the carburetor, whose an intake passage 1 can form any inclination only through the modification of the angle alphaof the mixing body B with the carburetor body A and the float chamber body C made to function in common, can be produced, and the effectiveness of mass production can be therefore displayed to simplify stock control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor that adjusts and controls the rate and concentration of air-fuel mixture supplied to an engine.

[Conventional technology]

In the past, engine cylinders were generally arranged vertically, but in recent years, due to higher engine output, stability when mounted on vehicles, and the first degree of freedom in vehicle design, Engines that are tilted in the forward direction tend to be frequently used, and the forward tilt angle of these engines is appropriately determined depending on the respective design specifications.

On the other hand, from the point of view of air suction efficiency, it is desirable that the intake duct of the carburetor installed in this forward-tilting engine be connected to the engine as straight as possible. It is necessary to prepare the container itself specially.

[Problem to be solved by the invention]

Such conventional vaporizers have the following problems.

■The carburetor body is generally molded using a die-casting mold, which includes a matrix for the external shape of the carburetor, a core for molding the intake passage, the recessed part of the float chamber, the throttle valve guide, etc. , all of them need to be newly manufactured to match the forward tilt angle of the engine, which increases the cost of molds, which is undesirable, especially in the current production situation of high-mix, low-volume production, which significantly raises product costs.

(8) When processing the carburetor body, the intake passage that passes through the carburetor body is often used as the edge of the processing jig, but if the angle of inclination of the intake passage with respect to the carburetor body changes each time, the angle of the processing jig changes and production As equipment cannot be reused, investment in manufacturing equipment increases, equipment setup time increases,
This is undesirable because it causes a significant increase in processing costs.

■It is undesirable to increase the management space when managing the inventory of the carburetor itself, which takes up the largest space among the vaporizer components, or when managing the Okegawa.

[Means for Solving the Problems] [Operation] The carburetor of the present invention was made in view of the above problems, and its main purpose is to use a common carburetor main body and a float chamber main body to provide a horizontal engine or an inclined angle engine. The purpose of the present invention is to provide a carburetor that can be used in different types of forward-leaning engines, and in order to achieve the above-mentioned purpose, an intake passage passes through the carburetor body, and a mixing body attachment end is provided on one side of the carburetor body; A mounting end on the side of the carburetor body that is in contact with the mounting end on the mixing body of the carburetor body, a mounting end on the float chamber body side located on the opposite side of the mounting end on the carburetor body side, and a mounting end on the side of the carburetor body. and a float chamber concave portion formed between the float chamber body side mounting end portion of the mixing body; The chamber body: The mixing body side attachment end of the mixing body is arranged at the mixing body attachment end of the vaporizer body, and the mixing body side of the float chamber body is arranged at the attachment end of the mixing body on the float chamber body side. The mounting end is arranged, a float chamber is formed by the float chamber recess of the mixing body and the float chamber main body, and the relative angle α between the mounting end of the mixing body on the float chamber main body side and the mounting end on the carburetor main body side is set. By changing this, the inclination angle of the longitudinal axis of the intake passage of the carburetor main body with respect to the mixing body side attachment end of the float chamber main body is changed.

〔Example〕

Hereinafter, the first embodiment of the vaporizer according to the present invention will be explained in Figs. 1 and 2.
This will be explained with reference to FIGS. 3 and 4.

The carburetor is composed of a carburetor body A, a mixing body B, and a float chamber body C. The carburetor main body A has an intake passage 1 passing through the main body in a horizontal direction, and an intake passage l.
A throttle valve guide tube 2 is bored approximately at the center of the air intake path 1 from above to below.

Further, a flat mixing body attachment end 3 parallel to the longitudinal axis x-x of the intake passage 1 is formed at a position below the intake passage 1, and the lower part of the throttle valve guide cylinder 2 is attached to this part. It opens at the mixing body attachment end 3.

Further, the mixing body B has a flat carburetor body side mounting end 4 that is in contact with a mixing body mounting end 3 of the carburetor main body A, and a flat shape that is in contact with a mixing body side mounting end of the float chamber main body, which will be described later. a float chamber main body side mounting end 5;
The carburetor main body side mounting end 4 and the float chamber main body side mounting end 5
It is further fitted into the lower opening of the throttle valve guide cylinder 2 which can be punched into the carburetor main body A above the carburetor main body side mounting end 4. A closing protrusion 7 is formed to protrude, and an end face 7 of the closing protrusion 7 is formed.
A throttle valve guide part 8 is formed to protrude upward from A, and this throttle valve guide part 8 has a substantially concave shape corresponding to the shape of the intake passage l.
A through hole 9 is formed.

Therefore, a pair of the throttle valve kite parts 8 are formed with the through hole 9 interposed therebetween.

By fitting the closing protrusion 7 of the mixing body B into the lower opening of the throttle valve guide cylinder 2, the through hole 9 is opened.
A series of intake passages 1 are formed by communicating with the intake passage 1, and a throttle valve guide IMIO is formed by the throttle valve guide cylinder 2 and the throttle valve guide portion 8.

In this embodiment, a rectangular throttle valve guide groove 10 is formed. Furthermore, the mixing body B has an intake passage l (
In this embodiment, there is provided a first passage 11 that opens into the through hole 9), and a second passage 12 that has one end connected to the first passage and the other end that opens below a certain liquid level in a float chamber, which will be described later. teeth,
The axes of the first passage 11 and the second passage 12 are arranged substantially concavely.

In addition, 13 is a needle jet arranged at the opening of the first passage 11 to the intake passage 1, 14 is a main fuel jet arranged at the lower part of the second passage 12, and 15 is a fuel source (not shown). A valve seat 17 is arranged at the end of the fuel passage 1G connected to the float valve 1. The float valve 17 controls the opening and closing of the valve seat 15.
The valve seat 15 is opened and closed according to the rotation of the valve 8.

The float chamber main body C has a cup shape with a mixing body side mounting end 18 that opposes the float chamber main body side mounting end 5 of the mixing body B, and the float chamber main body C and the float chamber recess 6 of the mixing body B A float chamber 19 is formed by this.

A constant liquid level is thus formed in the float chamber 19 by the joint action of the valve seat 15, float valve 17, and float 18.

Reference numeral 20 denotes a throttle valve that is movably guided in the throttle valve guide groove 10 to control the opening area of the intake passage l, and in this embodiment, it has a rectangular shape (the throttle valve 2° is shown in FIG. 4). ) Further, a jet needle 21 inserted into the needle jet 13 of the first passage 11 is integrally attached to the throttle valve 20.

In this embodiment, the relative angle α between the attachment end 5 on the float chamber main body side and the attachment end 4 on the carburetor main body side of the mixing body B was set to 0 degrees so that they were parallel to each other.

By assembling the carburetor body A, the mixing body B, and the float chamber body C, a horizontal type carburetor in which the intake passage l passes through the carburetor body A in the horizontal direction as shown in FIG. 1 can be obtained. The throttle valve 20 has a throttle valve guide groove 1 formed by the throttle valve guide tube 2 of the carburetor body A and the throttle valve guide portion 8 of the mixing body B.
0, while the main fuel is guided by the main fuel jet 1
4 and is controlled by the gap between the needle jet 13 and the jet needle 21, and is sucked out into the intake passage 1.

Note that the shape of the throttle valve 20 is not limited to a rectangle.

Next, an embodiment of the carburetor in which the intake path l is inclined toward the engine side will be described with reference to FIG. At this time, there is no need to make any changes to the carburetor main body A and the float chamber main body C (therefore, the explanation will be omitted and the same reference numerals will be used).The following changes will be made to the mixing body B.

Flat carburetor body side mounting end 4 of mixing body B
The relative angle α with respect to the attachment end 5 on the float chamber main body side is assumed to be tilted to the left with the attachment end 5 on the float chamber main body side as a horizontal reference.

Further, the first passage 11 containing the needle jet 13 is oriented perpendicularly to the attachment end 4 on the side of the carburetor body and opens into the through hole 9, and the second passage 1 containing the main fuel jet 14 is opened in the through hole 9.
2 is connected to the first passage 11 substantially perpendicularly to the attachment end 5 on the float chamber main body side. In addition, the float chamber 18 of the valve seat 15
There is no need to change the opening position inward from the first embodiment.

According to such a configuration, the relationship between the attachment end 5 of the mixing body B on the float chamber main body side and the mixing body side weir +1 end 18 of the float window main body C is not changed in any way as shown in the figure, but the same vaporization is performed. Even when the carburetor body A is used, the intake passage 1 of the carburetor body A can be tilted forward with respect to the mixing body side mounting end 18 of the float window body C, making it possible to tilt the engine This makes it possible to install it.

Therefore, in order to change the forward inclination angle of the intake passage I, it is sufficient to change the relative angle of the attachment end 4 on the carburetor body side with respect to the attachment end 5 on the float chamber body side of the mixing body B.

In this embodiment, a sliding throttle valve type carburetor in which the throttle valve slides in the L downward direction inside the throttle valve guide cylinder has been described, but a butterfly type carburetor may also be used. When applied to a container, the closing protrusion of the mixing body B becomes unnecessary.

That is, there is no need to close the opening of the throttle valve guide cylinder.

〔Effect of the invention〕

As described above, the vaporizer according to the present invention has the following effects.

■ By changing the relative angle α between the attachment end of the mixing body on the float chamber body side and the end of the weir side on the carburetor body side, any inclination angle can be achieved using a common carburetor body and float window body. This made it possible to manufacture a carburetor for the intake tract, which eliminated the need to invest in the cost of all new molds and jigs, and also reduced the cost of the carburetor body, float window body, It is possible to increase the number of products produced and achieve a mass production effect, and furthermore, it is possible to reduce the setup time of jigs, etc., and furthermore, it is possible to simplify inventory management, and to significantly reduce the manufacturing cost of vaporizers. This is what was created.

■For the shape of the throttle valve of the carburetor, various shapes such as H-shaped and oval ring shapes are adopted due to issues of suction efficiency and setting properties, but in the present invention, the throttle valve guide cylinder is formed in the shape of an irregularly shaped throttle valve. By using a broach to penetrate and slide the throttle valve guide cylinder, and then closing the opening on the float chamber side with the closing protrusion of the mixing body, a bottomed throttle valve guide cylinder could be formed. This makes it possible to further simplify the production of the throttle valve guide tube when changing from a circular throttle valve to an irregularly shaped throttle valve.

■When it is necessary to guide the throttle valve around its inner and outer circumferences, the throttle valve guide groove can be formed by the throttle valve guide part of the mixing body and the throttle valve guide tube, making it possible to form the throttle valve guide groove at a low cost. It was easy to do.

124) According to the provision of the first passage and the second passage,
Even when the intake passage is formed at any angle of inclination, the head difference between the main combustion jets and the liquid level in the float chamber can always be kept constant, and the setting performance of the carburetor is not hindered. Furthermore, the arrangement of the jet needle is not hindered.

[Brief explanation of the drawing]

The figure shows one embodiment of the vaporizer according to the present invention.
The figure is a longitudinal cross-sectional view with the intake tract arranged horizontally, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1.
3 is a perspective view of the mixing body in FIG. 1, FIG. 4 is a perspective view of the throttle valve in FIG. 1
The illustration and mixing body are different. A90. Carburetor body B, Mixing body C, Float chamber body 1, Intake path 2. , Throttle valve guide cylinder 3 , Mixing tenon attachment end 4 , Carburetor body side attachment end 5 , Float chamber body side attachment end 7 , Closure protrusion 8. Throttle valve guide portion 10, Throttle valve guide groove Il, First passage +2. ,,,Second passage 19. ,,, Float room 2
0,,,,throttle valves/勺))to?

Claims (7)

[Claims] (1) A carburetor main body A through which an intake passage 1 passes and a mixing body mounting end 3 provided on one side of the carburetor main body A; a carburetor main body side mounting opposite to the mixing body mounting end 3 of the carburetor main body A; between the end 4, the float chamber main body side mounting end 5 located on the opposite side of the carburetor main body side mounting end 4, and the carburetor main body side mounting end 4 and the float chamber main body side mounting end 5. A mixing body B provided with a formed float chamber recess 6 ; A float chamber main body C provided with a mixing body side mounting end 18 that opposes the float chamber main body side mounting end 5 of the mixing body B; , mixing body attachment end 3 of carburetor body A
At the same time, place the attachment end 4 of the mixing body B on the side of the carburetor body, and place the attachment end 1 of the float chamber body C on the side of the mixing body at the attachment end 5 of the mixing body B on the side of the float chamber body.
8 is arranged, a float chamber 18 is formed by the float chamber recess 6 of the mixing body B and the float chamber main body C, and further, the float chamber main body side mounting end 5 of the mixing body B and the vaporizer main body side mounting end 4 are arranged. The inclination angle of the longitudinal axis X--X of the intake passage 1 of the carburetor main body A with respect to the mixing body side mounting end 18 of the float chamber main body C is changed by changing the relative angle α. (2) The intake passage 1 passes through the inside, and the mixing body attachment end 3 is provided on one side of the intake passage 1, and the throttle valve guide cylinder 2 further extends approximately perpendicularly to the intake passage 1 and penetrates from above toward the mixing body attachment end 3 side. a carburetor main body A provided with; a carburetor main body side mounting end 4 facing the mixing body mounting end 3 of the carburetor main body A; and a float chamber main body located on the opposite side of the carburetor main body side mounting end 4. side mounting end 5, a float chamber recess 6 formed between the carburetor main body side mounting end 4 and the float chamber main body side mounting end 5, and the mixing body mounting end 3 side of the carburetor main body A. A mixing body B provided with a closing protrusion 7 that closes an opening throttle valve guide cylinder 2; A float provided with a mixing body side mounting end 18 that opposes the float chamber main body side mounting end 5 of the mixing body B; The chamber body C and the mixing body attachment end 3 of the carburetor body A.
The attachment end 4 of the mixing body B on the side of the carburetor body is arranged at the side, and the throttle valve guide tube 2 opening on the side of the mixing body B of the carburetor body A is closed with the closing protrusion 7 of the mixing body B. The mixing body side attachment end 18 of the float chamber main body C is arranged in the float chamber main body side attachment end 5 of the mixing body B, and the float chamber 18 is formed by the float chamber recess 6 of the mixing body B and the float chamber main body C. , by further changing the relative angle α between the float chamber main body side mounting end 5 of the mixing body B and the carburetor main body side mounting end 4, the mixing body side mounting end 18 of the float chamber main body C is
A carburetor in which the inclination angle of the longitudinal axis line X-X of the intake passage 1 of the carburetor main body A is changed relative to that of the carburetor body A. (3) The intake passage 1 passes through the interior, the mixing body attachment end 3 is provided on one side of the intake passage 1, and the throttle valve guide cylinder 2 extends approximately orthogonally to the intake passage 1 and penetrates from above toward the mixing body attachment end 3. a carburetor main body A provided with; a carburetor main body side mounting end 4 facing the mixing body mounting end 3 of the carburetor main body A; and a float chamber main body located on the opposite side of the carburetor main body side mounting end 4. side mounting end 5, a float chamber recess 6 formed between the carburetor main body side mounting end 4 and the float chamber main body side mounting end 5, and the mixing body mounting end 3 side of the carburetor main body A. A closing protrusion 7 that closes the opening throttle valve guide cylinder 2; a throttle valve guide part 8 that enters into the throttle valve guide cylinder 2 and forms a throttle valve guide groove 10 between the throttle valve guide cylinder 2; A mixing body B is provided with; a float chamber main body C is provided with a mixing body side mounting end 18 that opposes the float chamber main body side mounting end 5 of the mixing body B; End 3
At the same time, the attachment end 4 of the mixing body B on the side of the carburetor body is disposed, and the throttle valve guide tube 2 opening on the side of the mixing body 3 of the carburetor body A is closed with the closing protrusion 7 of the mixing body B, and the throttle valve is closed. A throttle valve guide groove 10 is formed by the valve guide portion 8 and the throttle valve guide tube 2, and the mixing body side mounting end 18 of the float chamber main body C is arranged in the float chamber main body side mounting end 5 of the mixing body B. , a float chamber 18 is formed by the float chamber recess 6 of the mixing body B and the float chamber main body C, and the relative angle α between the float chamber main body side mounting end 5 of the mixing body B and the carburetor main body side mounting end 4 is
A carburetor in which the inclination angle of the longitudinal axis X--X of the intake passage 1 of the carburetor main body A with respect to the mixing body side attachment end 18 of the float chamber main body C is changed by changing. (4) A carburetor main body A through which the intake passage 1 passes and a mixing body mounting end 3 provided on one side of the carburetor main body A; a carburetor main body side mounting opposite to the mixing body mounting end 3 of the carburetor main body A; between the end 4, the float chamber main body side mounting end 5 located on the opposite side of the carburetor main body side mounting end 4, and the carburetor main body side mounting end 4 and the float chamber main body side mounting end 5. The formed float chamber recess 6 and the first passage 1 connected to the intake passage 1
1, and the first
a mixing body B provided with a second passage 12 connected to the passage 11; and a float chamber main body C provided with a mixing body side mounting end 18 that opposes the float chamber main body side mounting end 5 of the mixing body B; ; The mixing body mounting end 3 of the carburetor main body A
At the same time, place the attachment end 4 of the mixing body B on the side of the carburetor body, and place the attachment end 1 of the float chamber body C on the side of the mixing body at the attachment end 5 of the mixing body B on the side of the float chamber body.
8 is arranged, a float chamber 18 is formed by the float chamber recess 6 of the mixing body B and the float chamber main body C, and further, the float chamber main body side mounting end 5 of the mixing body B and the carburetor main body side mounting end 4 are arranged. The inclination angle of the longitudinal axis X--X of the intake passage 1 of the carburetor main body A with respect to the mixing body side mounting end 18 of the float chamber main body C is changed by changing the relative angle α. (5) The carburetor according to claim 4, wherein a jet needle 21 that moves synchronously with the throttle valve 20 is inserted into the first passage. (6) The carburetor according to claim 4, wherein the first passage is opened substantially orthogonally to the intake passage 1. (7) The vaporizer according to claim 1, wherein the second passage is arranged substantially perpendicular to the liquid level formed in the float chamber 18.