JP4902401B2 - Throttle body for internal combustion engine - Google Patents

Description

  In the present invention, fuel in a fuel tank is boosted by a fuel pump, and the boosted fuel is injected and supplied to an internal combustion engine (hereinafter simply referred to as an engine) through a fuel injection valve attached to a throttle body. Regarding the device, in particular, two intake passages drilled in the throttle body are arranged next to each other in parallel, and the engine side mounting cap formed on the outer periphery of each intake passage on the engine side is connected to the engine via a rubber mount. The present invention relates to a throttle body for an internal combustion engine to be connected.

Such a conventional throttle body for an internal combustion engine is disclosed in Patent Document 1.
This will be described with reference to FIGS. 4 and 5 created based on FIGS. 2 and 3 disclosed in Patent Document 1. FIG.
Reference numeral 20 denotes a throttle body in which an intake passage 21 penetrates the side. The opening area of the intake passage 21 is orthogonal to the longitudinal axis XX of the intake passage 21, and the intake passage 21. Is controlled by a throttle valve 23 attached to a throttle valve shaft 22 rotatably supported by the throttle body 20. J is a fuel injection valve disposed on the lower side B in the drawing of the intake passage 21 and sandwiched between the fuel distribution pipe 25 and the throttle body 20, and the tip Ja of the fuel injection valve J is placed in the injection valve insertion hole 26. Further, the injection valve insertion hole 26 is inserted toward the engine side intake passage 21 a and the spray escape hole 27 connected to the engine side end surface 21 b of the intake passage 21 from the throttle valve 23. The spray escape hole 27 is provided in order to prevent the atomized fuel injected from the nozzle hole at the tip of the fuel injection valve J from colliding with the inner peripheral wall of the intake passage 21a.
The engine side end face 21b of the intake passage is formed with an engine side attachment base 28 that surrounds the intake passage 21a on the engine side from the throttle valve and the spray escape hole 27 that is connected to the intake passage 21a. .
As shown in FIG. 5, the engine side mounting base 28 is on a line ZZ that is orthogonal to the longitudinal axis YY of the throttle valve shaft 22 and passes through the center (A) of the intake passage 21. Further, the throttle valve shaft 22 is formed in a circular shape on the basis of the position (a) eccentric from the longitudinal axis YY of the throttle valve shaft 22 toward the lower side (B). The engine side mounting base 28 has a mounting length (L) from the engine side end face 21b of the intake passage toward the throttle valve shaft 22 side.
Two such intake passages 21 are arranged side by side in parallel, and the longitudinal axis YY of the throttle valve shafts 22 are arranged on the same straight line. A first rubber mount 29 ₁ that is inserted and connected to the _first engine side mounting base 28 ₁ of the first intake passage 21F that is arranged is connected to the engine (not shown), and the second intake air that is arranged on the right side. A second rubber mount 29 ₂ inserted and connected to the _second engine side mounting base 28 ₂ of the passage 21S is connected to an engine (not shown). Thus, the fuel injected from the fuel injection valve J into the first intake passage 21F is supplied to the engine via the _first rubber mount 291, and from the fuel injection valve J into the second intake passage 21S. The injected fuel is supplied to the engine via the _second rubber mount 29 ₂ .
JP 2006-342675 A

In such a conventional throttle body, the center pitch (P) of two intake passages arranged adjacently in parallel, that is, the first intake passage 21F and the second intake passage 21S is effectively reduced. I can't.
This is because the gap (S1) between the outer circumferences of the first and second rubber mounts 29 ₁ and 29 ₂ inserted and connected to the first and second engine side mounting bases 28 ₁ and 28 ₂ arranged adjacent to each other in parallel. ) Is formed in the necessary gap from the viewpoint of insertion workability. In addition, the rubber thickness of the first and second rubber mounts 29 ₁ and 29 ₂ should be formed to a required thickness (t) in terms of strength design. Further, the circular centers of the first and second engine side mounting caps 28 ₁ and 28 _{2 having} a circular shape are perpendicular to the longitudinal axis YY of the throttle valve shaft 22 and pass through the center A of the intake passage 21. Be placed in ZZ. Thus, the opposing gap (S2) between the first and second engine side mounting caps 28 ₁ and 28 ₂ is determined.
That is, in order to reduce the center pitch (P), if the gap (S1) between the outer circumferences of the first and second rubber mounts 29 ₁ and 29 ₂ is reduced, the workability of inserting the rubber mount into the engine side mounting base is improved. And the attachment property of the annular fastening member fitted to the outer periphery of the rubber mount is hindered, and if the thickness (t) of the rubber mount is reduced, the rigidity of the rubber mount is lowered.
According to the above, it is difficult to increase the degree of freedom for mounting the throttle body, particularly in a motorcycle where the installation space around the engine is limited to be narrow.

  The present invention has been made in view of the above problems. Two intake passages are arranged side by side in parallel, and an engine side mounting base formed on the outer periphery of the intake passage on each engine side is an engine mounted by a rubber mount. To provide a throttle body that can be mounted on a motorcycle by using a rubber mount having a conventional circular shape, shortening the center pitch of each intake passage, and improving the mountability to a motorcycle. With the goal.

In order to achieve the above-mentioned purpose, the throttle body for an internal combustion engine according to the present invention has an intake passage formed in the throttle body perpendicular to the longitudinal axis of the intake passage and laterally crossed with a throttle valve. A throttle valve shaft to be attached, a fuel injection valve disposed below the intake passage toward the engine side intake passage from the throttle valve via a spray escape hole, and an intake side on the engine side from the throttle valve the surrounding the fuel spray escaping hole provided continuously from the passage and the throttle valve in an intake passage of the engine side, and a engine side mounting pipe sleeve forming a circular shape to be formed on the outer periphery of the engine side end surface of the intake passage, the intake passage Are arranged side by side in parallel, and the longitudinal axis of both throttle valve shafts is arranged on the same line, and the engine side mounting cap of each intake passage is connected to the engine via a tubular rubber mount. in the arrangement throttle body for an internal combustion engine, the first intake The first circular center of the first engine side mounting base formed on the engine side end face of the road is (a) decentered below the longitudinal axis (Y)-(Y) of the throttle valve shaft and (B) eccentrically arranged on the outer side of one side of the line (Z)-(Z) perpendicular to the longitudinal axis (Y)-(Y) and passing through the center of the first intake passage, while the second The second circular center of the second engine side mounting base formed on the engine side end face of the intake passage is eccentric (a) below the longitudinal axis (Y)-(Y) of the throttle valve shaft. The first is that (b) the eccentric arrangement is arranged on the outer side outside the line (Z)-(Z) perpendicular to the longitudinal axis (Y)-(Y) and passing through the center of the second intake passage. It is characterized by.

According to the present invention, the first intake passage formed in the throttle body is perpendicular to the longitudinal axis of the first intake passage, and the throttle valve shaft is attached transversely to the throttle valve shaft. A fuel injection valve disposed below the first intake passage through the spray escape hole from the throttle valve toward the engine-side intake passage, and the engine-side intake passage and throttle from the throttle valve A first engine side mounting base that surrounds the spray escape hole that is connected to the engine side intake passage from the valve, and that has a circular shape formed on the outer periphery of the engine side end surface of the first intake passage; The second intake passage formed in the throttle body is perpendicular to the longitudinal axis of the second intake passage and crosses sideways to attach the throttle valve, and the second intake passage. A fuel injection valve disposed above the intake passage through the spray escape hole from the throttle valve toward the engine-side intake passage, and a throttle A second circular shape is formed on the outer periphery of the end surface on the engine side of the second intake passage, surrounding the spray escape hole connected to the intake passage on the engine side from the valve and the intake passage on the engine side from the throttle valve. of a engine side mounting pipe sleeve, said first and second intake passage is parallel adjacently provided arranged laterally and in the intake passages with the longitudinal axial line of the both throttle valve shaft are arranged on the same line In a throttle body for an internal combustion engine in which each engine side mounting base is connected to the engine via a tubular rubber mount, the first engine side mounting base formed on the engine side end face of the first intake passage is provided. (1) The center of the circle is decentered downward (a) from the longitudinal axis of the throttle valve shaft, and perpendicular to the longitudinal axis, and outward one side from the line passing through the center of the first intake passage ( b) A second arrangement formed eccentrically on the engine side end face of the second intake passage. The second circular center of the side attachment base is (a) eccentric from the longitudinal axis of the throttle valve shaft and is perpendicular to the longitudinal axis and passes through the center of the second intake passage. The second feature is that (b) an eccentric arrangement is provided on the laterally outer side.

According to the first feature of the present invention, the first circular center of the first engine-side mounting base is (a) decentered downward from the longitudinal axis YY and on the one side outside the line ZZ. (B) is set at an eccentric position, and the second circular center of the second engine-side mounting base is (a) eccentric from the longitudinal axis YY and from the line ZZ. It is set at a position that is (b) eccentric to the outer side of the other side.
According to the above, in the throttle body in which two intake passages are arranged next to each other in parallel, and the fuel injection valve is arranged below each intake passage, the first intake passage and the second intake passage that are arranged next to each other are arranged. The center pitch can be shortened by a distance corresponding to (b) + (b), and in particular, the degree of freedom of mounting the throttle body on the motorcycle can be increased.
In addition, since the first and second engine side mounting caps are formed in a circular shape as in the prior art, a rubber mount having a circular shape similar to the conventional one can be used, and the behavior of the air flow changes greatly. Therefore, the mixed state of fuel and air injected from the fuel injection valve can be maintained well.

Also, according to the second feature of the present invention, the first circular center of the first engine side mounting base is (a) decentered downward from the longitudinal axis YY and is one line from the line ZZ. The second circular center of the second engine side mounting base is set to an upper side of the longitudinal axis YY and (a) is eccentric and line ZZ. It is set at a position that is (b) eccentric to the outer side of the other side. According to the above, two intake passages are arranged next to each other in parallel, one fuel injection valve is arranged below the first intake passage, and the other fuel injection valve is arranged above the second intake passage. In the throttle body, the center pitch between the first intake passage and the second intake passage which are adjacent to each other can be shortened by a distance corresponding to (b) + (b). The degree of freedom of mounting the throttle body on a motorcycle can be increased.
Further, as in the first feature, the mixed state of fuel and air in the rubber mount can be maintained satisfactorily.

An embodiment of a throttle body for an internal combustion engine according to the present invention will be described below with reference to FIG.
FIG. 1 corresponds to the right side view of FIG. 4 and only the main part of the invention will be described.
Reference numeral 1 denotes a first intake passage that penetrates through the throttle body 2, and the throttle valve shaft 3 to which the throttle valve 23 is attached is orthogonal to the longitudinal axis of the first intake passage 1. The throttle body 2 is rotatably supported across the center of the first intake passage 1. (The longitudinal axis of the first intake passage 1 is the same as the longitudinal axis XX shown in FIG. 4) J is disposed on the lower side (B) of the first intake passage 1 in FIG. The front end Ja of the fuel injection valve J is inserted into the injection valve insertion hole 4, and the injection valve insertion hole 4 further includes the first intake passage 1a and the first intake passage 1a closer to the engine than the throttle valve. The intake passage 1 opens toward the spray escape hole 5 connected to the end surface 1b on the engine side. Accordingly, the engine-side end face 1b of the first intake passage 1 is opened with the first intake passage 1a on the engine side from the throttle valve and the spray escape hole 5 connected to the first intake passage 1a.
The outer periphery of the engine-side end face 1b of the first intake passage 1 has a circular shape surrounding the spray intake hole 5 connected to the first intake passage 1a on the engine side and the first intake passage 1a from the throttle valve. A first engine side mounting base 6 is formed.
The center (F) of the first circle of the first engine side mounting base 6 is (a) decentered to the lower side (B) from the longitudinal axis YY of the throttle valve shaft 3 and the longitudinal direction. (B) It is eccentrically arranged on the outer side (C) on the one side from the line ZZ passing through the center (G) of the first intake passage 1 and orthogonal to the axis YY. (In FIG. 1, the outer side on one side is the left side.)
Reference numeral 11 denotes a second intake passage that penetrates through the throttle body 2, and the throttle valve shaft 3 to which the throttle valve 23 is attached is orthogonal to the longitudinal axis of the second intake passage 11. The throttle body 2 is rotatably supported across the center of the second intake passage 11. (The longitudinal axis of the second intake passage 11 is the same as the longitudinal axis XX shown in FIG. 4) J is disposed on the lower side (B) of the second intake passage 11 in FIG. The front end Ja of the fuel injection valve J is inserted and arranged in the injection valve insertion hole 4, and the injection valve insertion hole 4 further includes the second intake passage 11a and the second intake passage 11a closer to the engine than the throttle valve. The two intake passages 11 open toward the spray escape holes 5 that are continuous with the engine-side end surface 11b.
Therefore, the engine-side end surface 11b of the second intake passage 11 is opened with the second intake passage 11a on the engine side from the throttle valve and the spray escape hole 5 connected to the second intake passage 11a.
Further, the outer periphery of the end surface 11b on the engine side of the second intake passage 11 has a circular shape surrounding the spray intake hole 5 connected to the second intake passage 11a on the engine side and the second intake passage 11a from the throttle valve. A second engine side mounting base 16 is formed.
The center (H) of the second circle of the second engine side mounting base 16 is (a) decentered to the lower side (B) from the longitudinal axis YY of the throttle valve shaft 3 and the longitudinal direction. (B) It is eccentrically arranged on the outer side (D) on the other side of the line ZZ that is orthogonal to the axis YY and passes through the center (G) of the second intake passage 11. (In FIG. 1, the outer side on the other side is the right side.)
The first intake passage 1 and the second intake passage 11 are arranged adjacent to each other in parallel. At this time, the throttle valve shaft 3 crossing both intake passages 1 and 11 has the same longitudinal axis YY. (In this embodiment, the throttle valve shaft 3 is formed of a single shaft)
In addition, fuel injection valves J, J are disposed below (B) the first intake passage 1 and the second intake passage 11, respectively.
Similarly to FIG. 5, the first engine side mounting base 6 is connected to the engine via a first rubber mount (not shown), and the second engine side mounting base 16 is connected to a second rubber mount (FIG. (Not shown) to the engine.

According to the above, in the state shown in FIG. 1, the center pitch (P) between the first intake passage 1 and the second intake passage 11 is formed to be the same as the center pitch (P) shown in FIG. Is done.
On the other hand, in FIG. 1, the opposing gap (S3) between the right end 6a of the first engine-side mounting base 6 and the left end 16a of the second engine-side mounting base 16 is the first and second gaps shown in FIG. It can be formed larger by (b) + (b) than the opposing gap (S2) between the two engine side mounting caps 28 ₁ , 28 ₂ .
This is because the center (F) of the first circle of the first engine side mounting base 6 is on the outer side (C) on the one side of the line ZZ passing through the center (G) of the first intake passage 1 (b). Being eccentric. The center (H) of the second circle of the second engine side mounting base 16 is (b) eccentric to the other outer side (D) from the line ZZ passing through the center (G) of the second intake passage 11. Depending on what

Here, the facing gap between the first engine side mounting base 6 and the second engine side mounting base 16 may be the facing gap (S2) shown in FIG. (In the conventional opposing gap (S2), each rubber mount is inserted and connected to the first engine side mounting base 28 ₁ and the second engine side mounting base 28 ₂ without hindrance) The first shown in FIG. 1 again Paying attention to the facing gap (S3) between the engine side mounting base 6 and the second engine side mounting base 16 as described above, the facing gap (S3) = (S2) + (b) + (b) is established. According to this, the conventional center pitch (P) between the first intake passage 1 and the second intake passage 11 is shortened by (b) + (b) as shown in FIG. The center pitch can be shortened.
Then, the facing gap between the first engine side mounting base 6 and the second engine side mounting base 16 in the state of FIG. 2 is again formed as the facing gap (S2) shown in FIG. In a state where the center pitch between the first intake passage 1 and the second intake passage 11 can be shortened to (Pa) corresponding to (b) + (b), the first and second engine side mounting caps 6 , 16 and each rubber mount can be inserted and connected satisfactorily.

  According to the above, the throttle body in which the first intake passage 1 and the second intake passage 11 are arranged next to each other in parallel, and the fuel injection valve J is arranged below the intake passages 1 and 11. The center pitch of the first intake passage 1 and the second intake passage 11 can be shortened corresponding to (b) + (b) as compared with the prior art, and the periphery of the engine is narrowly limited like a two-wheeled vehicle. As a result, the mountability of the throttle body can be greatly improved. The first intake passage and the second intake passage may be provided in each throttle body, and two throttle bodies may be connected to the side, or the first intake passage and the first intake passage may be provided in a single throttle body. A so-called two-barrel type in which the second intake passage is formed in parallel may be used.

FIG. 3 shows a second embodiment of the present invention.
In FIG. 3, the first intake passage, the first engine side mounting base, etc. arranged on the left are the left first intake passage 1, the first engine side mounting base shown in FIG. Since the structure is the same as 6 etc., the same reference numerals are used and the description is omitted.
The second intake passage disposed on the right side in FIG. 3 will be described below.
Reference numeral 30 denotes a second intake passage that is formed through the throttle body 2, and the throttle valve shaft 3 to which the throttle valve 23 is attached is orthogonal to the longitudinal axis of the second intake passage 30. The throttle body 2 is rotatably supported across the center of the second intake passage 30. (The longitudinal axis of the second intake passage 30 is the same as the longitudinal axis XX shown in FIG. 4) J is disposed on the upper side (K) in the drawing of the second intake passage 30 This is a fuel injection valve, and the tip end Ja of the fuel injection valve J is inserted into the injection valve insertion hole 4, and the injection valve insertion hole 4 further includes the second intake passage 30 a and the second intake passage 30 a closer to the engine than the throttle valve. The intake passage 30 opens toward the spray escape hole 5 connected to the engine-side end face 30b.
Therefore, the engine-side end face 30b of the second intake passage 30 is provided with the second intake passage 30a on the engine side from the throttle valve and the spray escape hole 5 connected to the second intake passage 30a.
The outer periphery of the end surface 30b on the engine side of the second intake passage 30 has a circular shape surrounding the spray intake hole 5 connected to the second intake passage 30a on the engine side from the throttle valve and the second intake passage 30a. A second engine side mounting base 31 is formed.
The center (N) of the second circle of the second engine side mounting base 31 is (a) decentered above the longitudinal axis (Y) of the throttle valve shaft 3 (Y) and the longitudinal axis. (B) It is eccentrically arranged on the other outer side (D) from the line ZZ passing through the center (R) of the second intake passage 30 and orthogonal to the core line Y-Y.

The first intake passage 1 and the second intake passage 30 are arranged adjacent to each other in parallel. At this time, the throttle valve shaft 3 crossing both the intake passages 1 and 30 has the same longitudinal axis Y. The one fuel injection valve J is disposed on the lower side (B) of the first intake passage 1, and the other fuel injection valve J is disposed on the upper side (K of the second intake passage 30). ).
The first engine side mounting base 6 and the second engine side mounting base 31 are connected to the engine by a rubber mount (not shown) as in FIG.

  According to the second embodiment, the center (F) of the first circle of the first engine-side attachment base 6 is (a) biased downward (B) from the longitudinal axis YY of the throttle valve shaft 3. (B) is eccentrically arranged on the outer side (C) on one side of the line ZZ passing through the center (G) of the first intake passage 1 while being centered. The center (N) is eccentric (a) to the upper side (K) above the longitudinal axis YY of the throttle valve shaft 3, and the other side from the line ZZ passing through the center (R) of the second intake passage 30. Since (b) is eccentrically arranged on the outer side (D), the center pitch (Pa) of the first and second intake passages 1 and 30 is set to the eccentricity (b) + (b, as in the first embodiment. ) Can be shortened correspondingly.

  According to the above, the freedom degree of mounting of the throttle body arranged in the narrow V-shaped bank of the V-type engine can be greatly improved.

The principal part side view which shows one Example of the throttle body for internal combustion engines of this invention. The principal part side view which shows the state by which the center pitch of the intake passage was shortened in FIG. The principal part side view which shows the other Example of the throttle body for internal combustion engines of this invention. The longitudinal cross-sectional view which shows the throttle body for the conventional internal combustion engine. The main part right view in the state by which the throttle body of FIG. 4 was adjacently arranged by the side.

DESCRIPTION OF SYMBOLS 1 1st intake passage 1b Engine side end surface of 1st intake passage 3 Throttle valve shaft 6 1st engine side attachment cap 11 2nd intake passage 11b Engine side end surface of 2nd intake passage 16 2nd engine side Mounting base

Claims (2)

An intake passage drilled in the throttle body is perpendicular to the longitudinal axis of the intake passage, and a throttle valve shaft that crosses the side and attaches the throttle valve;
A fuel injection valve located below the intake passage and opened from the throttle valve toward the engine-side intake passage through a spray escape hole;
A circular engine-side mounting base that surrounds the spray escape hole that is connected to the engine-side intake passage from the throttle valve and the engine-side intake passage from the throttle valve, and that is formed on the outer periphery of the engine-side end surface of the intake passage. It equipped with a door,
Two intake passages are arranged side by side in parallel, and the longitudinal axis of both throttle valve shafts is arranged on the same line, and the engine side mounting cap of each intake passage is connected via a tubular rubber mount. In the throttle body for an internal combustion engine connected to the engine,
The first circular center (F) of the first engine side mounting base (6) formed on the engine side end face (1b) of the first intake passage (1) is the longitudinal axis of the throttle valve shaft (3). A line (a) decentered to the lower side (B) from (YY) and perpendicular to the longitudinal axis (YY) and passing through the center (G) of the first intake passage (1) ( The second engine side mounting base (16) is formed on the engine side end face (11b) of the second intake passage (11), while being eccentrically arranged on the one side outer side (C) from ZZ. ) Of the second circular center (H) is eccentric (a) to the lower side (B) of the longitudinal axis (YY) of the throttle valve shaft (3) and the longitudinal axis (YY). ), And (b) eccentrically arranged on the outer side (D) on the other side of the line (ZZ) passing through the center (G) of the second intake passage (11). Throttle body. A first intake passage bored in the throttle body, a throttle valve shaft that is perpendicular to the longitudinal axis of the first intake passage and that crosses sideways to attach a throttle valve;
A fuel injection valve disposed below the first intake passage and through the spray relief hole from the throttle valve toward the engine-side intake passage;
A first circular intake passage is formed on the outer periphery of the engine-side end surface of the first intake passage, surrounding the spray escape hole connected to the intake passage on the engine side from the throttle valve and the intake passage on the engine side from the throttle valve. and a first engine side mounting pipe sleeve,
Further, the second intake passage formed in the throttle body is perpendicular to the longitudinal axis of the second intake passage and crosses sideways to attach the throttle valve;
A fuel injection valve that is located above the second intake passage and is disposed through the spray escape hole from the throttle valve toward the engine-side intake passage;
A circular first shape is formed on the outer periphery of the engine side end surface of the second intake passage, surrounding the spray escape hole connected to the intake passage on the engine side from the throttle valve and the intake passage on the engine side from the throttle valve. and a second engine side mounting pipe sleeve,
The first and second intake passages are arranged side by side in parallel, the longitudinal axis of both throttle valve shafts are arranged on the same line, and each engine side mounting base of each intake passage is tubular rubber In a throttle body for an internal combustion engine that is connected to the engine via a mount,
The first circular center (F) of the first engine side mounting base (6) formed on the engine side end face (1b) of the first intake passage (1) is the longitudinal axis of the throttle valve shaft (3). A line that is eccentric (a) to the lower side (B) of the line (YY) and is orthogonal to the longitudinal axis (YY) and passes through the center (G) of the first intake passage (1). (B) A second engine side mounting cap (b) that is eccentrically arranged on the outer side (C) from (ZZ) and is formed on the engine side end surface (30b) of the second intake passage (30) ( 31) The second circular center (N) of (31) is eccentric (a) to the upper side (K) above the longitudinal axis (YY) of the throttle valve shaft (3) and the longitudinal axis (YY). ), And (b) eccentrically arranged on the outer side (D) on the other side outside (Z-Z) passing through the center (R) of the second intake passage (30). Throttle body.

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