JPH06257476A - Throttle valve structure for internal combustion engine - Google Patents

Abstract

PURPOSE:To supply air or atomized fuel to an internal combustion engine side and to improve warming up performance by inclining a throttle valve so that the height position of one side edge part is set to be higher than the other side edge part in a throttle valve, and boring a hole part on one side edge part side. CONSTITUTION:An injector 12 is arranged upstream of a body side intake passage 8a in the inside of a throttle body 8. A throttle valve 14 is arranged rotationally by a valve shaft 16 in the downstream side of the injector 12. In this case, the throttle valve 14 is slantingly arranged so that the height position of one side edge part 14A in the throttle valve 14 is set to be higher than that of the other side edge part 14B. A hole part 36 having the predetermined diameter is bored on one side edge part 14A side so that it penetrates the throttle valve 14. In this way, air or atomized fuel is fed to an internal combustion engine side by utilizing the hole part 36, and distribution performance of the air/fuel mixture can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve structure for an internal combustion engine, and more particularly to a throttle valve structure for an internal combustion engine which is rotatably disposed by a valve shaft in a body side intake passage formed in a throttle body. .

[0002]

2. Description of the Related Art An intake system of an internal combustion engine has an air cleaner, a throttle valve, a throttle body, a carburetor or injector, and an intake manifold. An injector is arranged at the site,
There is a throttle valve rotatably arranged downstream of the body side intake passage.

Further, as a butterfly type throttle valve for a carburetor, as disclosed in Japanese Utility Model Laid-Open No. 54-143927, a butterfly type throttle valve having a fitting hole formed in the intake passage of the carburetor is rotated. There is one in which an air quantity controller having a thermal conductivity lower than that of a butterfly throttle valve is fitted in the fitting hole, and an air quantity controller having an air control hole is fitted therein. It was

Further, as a mixture supply device, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 8-35263, a fuel injection valve is arranged in the intake passage of the engine upstream of the throttle valve, and fuel injected from the fuel injection valve is mixed with intake air to supply a mixture to the engine. In some supplies, a guide groove or a guide partition is formed on the upstream surface of the throttle valve to collect the adhered fuel at one place or at a plurality of places.

Further, as an air-fuel ratio control system for an internal combustion engine, as disclosed in Japanese Utility Model Publication No. 59-18114, fuel is discharged from the upstream side of a throttle valve provided in a downdraft type intake passage. In some of the internal combustion engines, an annular guide is provided along the peripheral edge of the upstream side of the throttle valve, a part of the guide is notched, and the fuel is made to flow down to a predetermined position in the intake passage.

[0006]

By the way, as shown in FIGS. 17 and 18, a substantially circular shape is formed by a plate member at the downstream portion of the throttle body 108 in which the injector 112 is arranged at the upstream portion. Throttle valve 11
4 is rotatably arranged.

The throttle valve 114 shown in FIG.
As shown in Fig. 5, there are variations in the mixture supplied to the cylinders # 1, # 2, # 3, and # 4, and the cylinders # 1, # 2, #
By varying the air-fuel ratios of 3 and # 4, THC spark (misfire state) from low temperature or from room temperature start to warm-up, and fogging of the plug and smoldering due to enrichment of the air-fuel ratio, engine stop However, there is a problem in that it is disadvantageous in practical use.

In order to avoid the above-mentioned inconvenience, as shown in FIGS. 20 and 21, the valve shaft 2 of the throttle valve 214.
16 and one side portion of the throttle valve 214 (see FIG.
0, the left side in FIG. 21)
2 and FIG. 23 and FIG.
As shown in FIG. 4, there is one in which a hole portion 336 penetrating the throttle valve 314 is provided in the vicinity of the other side edge portion of the throttle valve 314.

However, in the throttle valve 214 shown in FIGS. 20 and 21, since the hole portion 236 is provided at the portion where the fuel pool is likely to occur, at the extremely low temperature where a large amount of fuel injection is required, There is a risk that the hole 236 will be blocked by the fuel that has not been atomized, and as shown in FIG.
The distribution of the air-fuel mixture supplied to the cylinders # 1, # 2, # 3, # 4 is varied, and the cylinders # 2, # 3,
There is a disadvantage in that the air-fuel ratio of the cylinder # 1 is increased relative to the air-fuel ratio of # 4, and the engine speed state tends to be unstable, which is disadvantageous in practical use.

Similarly, in the throttle valve 314 shown in FIGS. 23 and 24, since the hole 336 is provided at a position where fuel is likely to be accumulated, at a very low temperature where a large amount of fuel injection is required. Then, there is a risk that the hole 336 will be blocked by the fuel that has not been atomized, and as shown in FIG. 25, the air-fuel ratios of the cylinders # 1, # 2, # 3, and # 4 will vary, The engine speed state is likely to be unstable, which is disadvantageous for practical use.

Further, in the above-mentioned two kinds of throttle valves 214 and 314, there is a fear that the non-atomized fuel is sucked from the holes 236 and 336 to the internal combustion engine side, and the distribution performance of the air-fuel mixture may be improved. However, there is an inconvenience that it is disadvantageous in practical use.

[0012]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention discloses a throttle for an internal combustion engine which is rotatably disposed by a valve shaft in a body side intake passage formed in a throttle body. In the valve structure,
The throttle valve is arranged so as to be inclined so that the height position of one side edge portion of the throttle valve is higher than the height position of the other side edge portion. A hole having a predetermined diameter is provided on the side edge side.

Further, in a throttle valve structure of an internal combustion engine rotatably arranged by a valve shaft in a body side intake passage formed in a throttle body, the height position of one side edge of the throttle valve is changed to another position. The throttle valve is arranged so as to be inclined with respect to the height position of the side edge portion, a protrusion is provided at a predetermined position on the upper surface of the throttle valve, and the protrusion and the throttle valve have a protrusion. And a throttle valve having a predetermined diameter so as to penetrate the throttle valve.

[0014]

According to the invention as described above, when the internal combustion engine is operating at a low speed, the body provided upstream of the throttle valve to the body provided downstream of the throttle valve is provided by a hole provided at one edge of the throttle valve. The air-fuel mixture is being sucked into the side intake passage.

Further, when the internal combustion engine is running at low speed, the protrusion provided at a predetermined position on the upper surface of the throttle valve and the hole penetrating the throttle valve allow the body intake passage upstream of the throttle valve to reach the throttle valve more than the throttle valve. The air-fuel mixture is drawn into the downstream body-side intake passage.

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 6 show a first embodiment of the present invention. In FIG. 4, 2 is an internal combustion engine, and 4 is an intake passage. The intake passage 4 of the internal combustion engine 2 includes an air cleaner side intake passage 6a in an air cleaner 6 and a body side intake passage 8a in a throttle body 8 which are sequentially connected from the upstream side.
And a manifold-side intake passage 10a in the intake manifold 10.
It is formed by and.

An injector 12 is arranged upstream of the body-side intake passage 8a in the throttle body 8, and a throttle valve 14 is rotatable by a valve shaft 16 downstream of the injector 12. It is installed in.

The injector 12 is a fuel supply passage 1
8 communicates with the fuel tank 20. The fuel in the fuel tank 20 is pumped by a fuel pump 22,
The dust is removed by the fuel filter 24, and the fuel is distributed and supplied to the injector 12 by the fuel supply passage 18.

Further, the injector 12 is communicated with the fuel tank 20 through a fuel return passage 26. A fuel pressure adjusting section 28 for adjusting the fuel pressure is provided in the middle of the fuel return passage 26. The fuel pressure adjusting unit 28 adjusts the fuel pressure to a constant value by the intake pressure introduced from the pressure guiding passage 30 communicating with the intake passage 4, and returns the surplus fuel to the fuel tank 20 through the fuel return passage 26. It is a thing.

The throttle body 8 and the air cleaner 6 are connected by a bypass passage 32 that bypasses the throttle valve 14. This bypass passage 3
An idle air amount control valve 34 is provided in the middle of 2.

Further, as shown in FIG. 1, the height position of one side edge portion 14A of the throttle valve 14 is set to the other side edge portion 14B.
The throttle valve 1 to be higher than the height position of
4 is arranged so as to be inclined, and one side edge portion 1 is formed on the throttle valve 14 so as to penetrate the throttle valve 14.
A hole 36 having a predetermined diameter d is provided on the 4A side.

More specifically, the hole 36 has a center axis 36C located at a position separated from the one side edge 14A of the throttle valve 14 by a predetermined distance L, and has a predetermined diameter d. There is.

The predetermined distance L is the throttle valve diameter D
/5.0 to the throttle valve diameter D / 11.0.

The diameter d of the hole 36 is set to a throttle valve diameter D / 20 to a throttle valve diameter D / 40.

Further, the hole 36 is formed, for example, so as to penetrate the throttle valve 14 in the vertical direction and substantially perpendicularly to both front and back surfaces. The hole 36 is formed to have the same diameter from the upper end to the lower end.

Next, the operation will be described.

When the internal combustion engine 2 is running at low speed, fuel is supplied from the fuel tank 20 by the fuel pump 22 to the fuel filter 2.
4 to the injector 12, the injector 12 to supply the intake manifold 10 via the throttle valve 14 and the internal combustion engine 2.

Further, the bypass air is sent from the air cleaner 6 to the downstream portion of the throttle valve 14 by the bypass passage 32.

Further, a hole 36 provided on one side edge portion 14A side of the throttle valve 14 where the height position is high with respect to the other side edge portion 14B and a fuel pool is less likely to be generated, is provided on the upstream side of the throttle valve 14. Air or atomized fuel is fed downstream of the throttle valve 14.

As a result, the center axis 36C is located at a position separated from the one side edge 14A of the throttle valve 14 by the predetermined distance L, and air or atomization is performed by the hole 36 set to the predetermined diameter d. 6 can be sent to the internal combustion engine 2 side, and as apparent from FIG. 6, the distribution performance of the air-fuel mixture from the start to the warm-up state at low temperature can be improved, and the cylinders # 1, # 2, It is possible to reduce the variation in the air-fuel ratios of # 3 and # 4 and improve the warm-up property of the internal combustion engine 2, which is practically advantageous.

Further, one side edge portion 1 of the throttle valve 14
By providing the hole portion 36 at a position separated from the 4A by a predetermined distance L, the hole portion 36 can be formed without complicating the processing work as compared with the related art, and the manufacturing cost can be kept low, which is economical. Is advantageous.

7 to 11 show a second embodiment of the present invention. In the second embodiment, the parts having the same functions as those of the first embodiment will be described with the same reference numerals.

The feature of the second embodiment of the present invention is that the throttle valve 42 is arranged so that the height position of one side edge portion 42A of the throttle valve 42 is higher than the height position of the other side edge portion 42B. Is provided so as to be inclined, a protrusion 44 is provided at a predetermined position on the upper surface of the throttle valve 42, and the protrusion 44 and the throttle valve 42 penetrate the protrusion 44 and the throttle valve 42. The point is that a hole 46 having a predetermined diameter d is provided.

That is, while having a thickness smaller than the thickness of the throttle valve 42, for example, in the vicinity of the one side edge 42a on the upper surface of the throttle valve 42,
The cylindrical protrusion 44 is provided, for example, separately from the throttle valve, and the hole 46 that penetrates the protrusion 44 and the throttle valve 42 is provided.

This hole portion 46 has a predetermined diameter d at the central portion of the protruding portion 44 that does not affect the idle speed.
For example, it is formed to 1.0 to 1.5 mm.

Further, the protrusion 44 and the throttle valve 42 can be integrally formed as shown in FIG.

As a result, it is possible to reliably prevent the non-atomized fuel from passing through the hole portion 46 to the downstream side of the throttle valve 42 by the projection portion 44, and the hole portion penetrating the projection portion 44 and the throttle valve 42. The formation location of 46 can be arbitrarily determined, which is practically advantageous.

Further, as in the case of the first embodiment described above, air or atomized fuel can be fed to the internal combustion engine (not shown) side by the hole portion 46, and as is apparent from FIG. 11, at low temperature. The distribution performance of the air-fuel mixture from the start-up to the warm-up state can be improved, the variation in the air-fuel ratio of the cylinders # 1, # 2, # 3, and # 4 can be reduced, and the internal combustion engine (not shown) can be used. ) Can be improved in warm-up, which is practically advantageous.

The present invention is not limited to the first and second embodiments described above, and various application modifications are possible.

For example, in the first embodiment of the present invention, the holes 36 are formed so as to have the same diameter d from the upper end to the lower end, but as shown in FIGS. It is also possible to form and use 52 in a tapered shape so that the diameter d gradually increases toward the lower end.

Further, in the above-described first embodiment, the hole portion 36 is formed so as to penetrate the throttle valve in the vertical direction and substantially perpendicular to both front and back surfaces. However, as shown in FIGS. 14 to 16, the hole portion is formed. It is also possible to form and use the hole 62 so that the central axis 62C of 62 is inclined by a predetermined angle θ with respect to the upper surface of the throttle valve 64.

By doing so, an acute angle portion 66 having a predetermined angle θ can be formed at the downstream end portion of the hole portion 62, and it is possible to separate unatomized fuel from the throttle valve 64 and to atomize fuel. , Practically advantageous.

[0044]

As described above in detail, according to the present invention, in the throttle valve structure of the internal combustion engine, which is rotatably disposed by the valve shaft in the body side intake passage formed in the throttle body, the throttle valve The throttle valve is arranged so as to be inclined so that the height position of one side edge is higher than the height position of the other side edge, and the throttle valve is provided on one side edge side so as to penetrate the throttle valve. Since a hole with a predetermined diameter is provided, air or atomized fuel can be fed to the internal combustion engine side, and the distribution performance of the air-fuel mixture from start to warm-up at low temperature can be improved. In addition, the warm-up property of the internal combustion engine can be improved, which is practically advantageous.

Further, in the throttle valve structure of the internal combustion engine rotatably arranged by the valve shaft in the body side intake passage formed in the throttle body, the height position of one side edge of the throttle valve is set to the other side. The throttle valve is arranged so as to be inclined with respect to the height position of the edge portion, and a protrusion is provided at a predetermined position on the upper surface of the throttle valve, and the protrusion and the throttle valve have a protrusion and a throttle valve. Since a hole having a predetermined diameter is provided so as to penetrate the fuel cell, it is possible to reliably prevent fuel that is not atomized by the protrusion from passing through the hole to the downstream side of the throttle valve, and to penetrate the protrusion and the throttle valve. It is practically advantageous that the location where the hole is formed can be arbitrarily determined.

[Brief description of drawings]

FIG. 1 is a sectional view of a throttle body showing a first embodiment of the present invention.

FIG. 2 is a plan view of a throttle valve.

FIG. 3 is a sectional view of a throttle valve.

FIG. 4 is a schematic explanatory diagram of an intake system of an internal combustion engine.

FIG. 5 is a schematic sectional view of a throttle body.

FIG. 6 is a diagram showing an air-fuel ratio state.

FIG. 7 is a sectional view of a throttle body showing a second embodiment of the present invention.

FIG. 8 is a plan view of a throttle valve.

FIG. 9 is a sectional view of a throttle valve.

FIG. 10 is an enlarged view of a main part of a throttle valve.

FIG. 11 is a diagram showing an air-fuel ratio state.

FIG. 12 is a plan view of a throttle valve showing another embodiment of the present invention.

FIG. 13 is a sectional view of a throttle valve.

FIG. 14 is a plan view of a throttle valve showing another embodiment of the present invention.

FIG. 15 is a sectional view of a throttle valve.

FIG. 16 is an enlarged view of a main part of a throttle valve.

FIG. 17 is a sectional view of a throttle body showing a conventional technique of the present invention.

FIG. 18 is a plan view of a throttle valve.

FIG. 19 is a diagram showing an air-fuel ratio state.

FIG. 20 is a plan view of a throttle valve.

FIG. 21 is a sectional view of a throttle valve.

FIG. 22 is a diagram showing an air-fuel ratio state.

FIG. 23 is a plan view of a throttle valve.

FIG. 24 is a sectional view of a throttle valve.

FIG. 25 is a diagram showing an air-fuel ratio state.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Intake Passage 6 Air Cleaner 8 Throttle Body 10 Intake Manifold 12 Injector 14 Throttle Valve 16 Valve Shaft 18 Fuel Supply Passage 20 Fuel Tank 22 Fuel Pump 24 Fuel Filter 26 Fuel Return Passage 28 Fuel Pressure Regulator 30 Induction Passage 32 Bypass Passage 34 Idle air amount control valve 36 Hole

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[Procedure amendment]

[Submission date] November 18, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 3]

[Figure 8]

[Fig. 13]

[Figure 1]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 9]

[Figure 10]

[Fig. 12]

FIG. 14

FIG. 15

FIG. 16

FIG. 17

FIG. 18

FIG. 21

FIG. 11

FIG. 19

FIG. 20

FIG. 22

FIG. 23

FIG. 24

FIG. 25

Claims (2)

[Claims] 1. In a throttle valve structure of an internal combustion engine, which is rotatably disposed by a valve shaft in a body-side intake passage formed in a throttle body, the height position of one side edge of the throttle valve is changed to another. The throttle valve is arranged so as to be inclined with respect to the height position of the side edge portion, and this throttle valve is provided with a hole portion having a predetermined diameter on one side edge portion side so as to penetrate the throttle valve. A throttle valve structure for an internal combustion engine, which is characterized in that 2. In a throttle valve structure of an internal combustion engine, which is rotatably arranged by a valve shaft in a body side intake passage formed in a throttle body, the height position of one side edge of the throttle valve is The throttle valve is arranged so as to be inclined with respect to the height position of the side edge portion, a protrusion is provided at a predetermined position on the upper surface of the throttle valve, and the protrusion and the throttle valve have a protrusion. And a throttle valve having a predetermined diameter so as to pass through the throttle valve and the throttle valve.