JP3896711B2 - Fuel supply system for multiple throttle bodies - Google Patents

Description

[0001]
[Industrial application fields]
In the present invention, fuel stored in a fuel tank is boosted by a fuel pump, and the boosted fuel is injected and supplied into a plurality of intake passages via a plurality of fuel injection valves attached to a fuel distribution pipe. In particular, in a multiple throttle body comprising a plurality of intake passages, a plurality of fuel injection valves that inject fuel into the intake passages, and a fuel pipe that supplies fuel to the fuel injection valves. The present invention relates to a fuel supply device.
[0002]
[Prior art]
In a conventional fuel supply device for a multiple throttle body, a plurality of single throttle bodies through which an intake passage passes are arranged on the side, and throttle valves that open and close each intake passage are synchronized with each other.
A single fuel distribution pipe made of a rigid material having a fuel flow path therein is fixedly disposed across the plurality of throttle bodies, and a fuel pipe is provided at the end of the fuel flow path of the fuel distribution pipe. The fuel pipe is connected and supplied with fuel boosted by a fuel pump.
Further, a fuel injection valve is arranged facing the intake passage of each throttle body. The upper end of this fuel injection valve is inserted and supported in the support hole of the fuel distribution pipe, and the lower end is inserted and supported in the support hole of the throttle body. .
That is, each fuel injection valve arranged in each throttle body is sandwiched between the fuel distribution pipe and each throttle body.
Thus, when the fuel pump is driven, the fuel stored in the fuel tank is boosted by the fuel pump, and this boosted fuel is supplied to the fuel flow path of the fuel distribution pipe via the fuel pipe. The fuel in the fuel passage is injected and supplied into the intake passage of each throttle body via each fuel injection valve.
[0003]
[Problems to be solved by the invention]
Such a conventional fuel supply device for a multiple throttle body has the following problems.
(1) In multiple throttle bodies, the center pitch between adjacent throttle bodies varies depending on the engine design, such as the pitch between the cylinders of the engine, the arrangement of the intake passage, and the suitability for mounting on the vehicle. This also changes the center pitch of adjacent fuel injectors.
Here, as described above, when the center pitch of the fuel injection valve changes, it is necessary to change the length of the fuel distribution pipe holding the fuel injection valve and the support hole position of the fuel injection valve. It is necessary to prepare different fuel distribution pipes.
On the other hand, the fuel distribution pipe is generally manufactured by injection molding or pultrusion molding, and the preparation of the plurality of fuel distribution pipes described above increases the manufacturing cost of the fuel distribution pipe due to an increase in mold costs. It is not desirable to rise.
(2) Since the fuel distribution pipe is disposed laterally across the plurality of throttle bodies, the fuel distribution pipe is formed long in the lateral direction, and is manufactured by injection molding or pultrusion molding as described above.
According to the above, the diameter of the fuel flow path formed in the lateral direction of the fuel distribution pipe cannot be made sufficiently small. This is because the fuel flow path is formed long in the lateral direction over substantially the entire length of the fuel distribution pipe.
For example, in the case of injection molding, it is necessary to use a small-diameter core pin. According to this core pin, the core pin collapses or the core pin breaks during injection, resulting in a small-diameter fuel flow path. It is difficult to efficiently form.
According to the fact that the diameter of the fuel flow path cannot be made sufficiently small, at the initial start of the engine, it takes time to fill the fuel flow path with fuel, and the start-up response of the engine is sufficiently enhanced. Is difficult.
[0004]
The present invention has been made in view of the above-mentioned problems, and the main object of the present invention is to be able to deal with any center pitch of each throttle body constituting the multiple throttle body at a low cost, and at the time of initial start of the engine. The present invention provides a fuel supply device for a multiple throttle body that can improve the start response of the engine.
[0005]
[Means for achieving the object]
In order to achieve the above object, the fuel supply device for the multiple throttle body according to the present invention has a plurality of throttle bodies arranged on the side including an intake passage that is opened and closed by a throttle valve.
In the multiple throttle body in which each throttle valve is synchronously interlocked and the fuel injection valve is arranged toward the intake passage of each throttle body ,
The throttle body protrudes laterally, and is formed above the first support part, a first support part having a fuel injection valve support hole that is opened from the upper end into the intake passage downstream of the throttle valve. A second support part,
The fuel injection valve support member has a fuel injection valve support hole that opens toward one end from a flow path formed inside,
A fuel pipe support hole that opens from the flow path toward the side end thereof , and
By fixing each fuel injection valve support member on the second support portion of each throttle body,
The fuel injection valve is inserted and sandwiched between the fuel injection valve support hole of the fuel injection valve support member and the fuel injection valve support hole of the throttle body ,
Further , the first feature is that a pipe-shaped fuel pipe having a flow passage through the inside thereof is inserted and disposed in the fuel pipe support holes facing each other of the fuel injection valve support members adjacent to each other.
[0006]
In addition to the first feature, the present invention has a second feature that the fuel injection valve support member is formed of a synthetic resin material.
[0007]
According to the present invention, in addition to the first feature, the fuel injection valve support member is screwed and fixed to the throttle body with a screw, and an arm portion provided on the fuel injection valve support member is provided on the throttle body. A third feature is that the rotational movement of the fuel injection valve support member in the rotational direction of the screw is suppressed by engaging the stopper.
[0008]
Furthermore, the present invention, in addition to the first feature, the fuel pipe support hole is drilled from the side end of the fuel injection valve support member toward the flow path via the locking step.
In the state where the fuel pipe is inserted into the fuel pipe support hole, the distance from the insertion end of the fuel pipe to the locking step is made smaller than the insertion distance of the fuel pipe inserted into the fuel pipe support hole. 4 features.
[0009]
[Action]
According to the first feature, it is possible to cope with any center pitch of the throttle body by changing the length of the fuel pipe inserted into the opposed fuel pipe support hole of each adjacent fuel injection valve support member. Sometimes no changes are required to the fuel injector support member.
[0010]
According to the second feature, since the fuel injection valve support member is made of a synthetic resin material, the manufacturing cost can be reduced and the weight can be reduced.
[0011]
According to the third feature, when the fuel injection valve support member is screwed to the throttle body with a screw, the fuel injection valve support member can be accurately fixed at a predetermined position, and particularly into the fuel pipe support hole. The fuel pipe can be inserted and arranged reliably and easily.
[0012]
Further, according to the fourth feature, even if the fuel pipe moves in the fuel pipe support hole, the side movement of the fuel pipe is prevented by the fuel pipe insertion end abutting against the locking step of the fuel pipe support hole. Therefore, the fuel pipe can always be reliably disposed in the fuel pipe support hole.
[0013]
【Example】
Hereinafter, an embodiment of a fuel supply device for a multiple throttle body according to the present invention will be described with reference to the drawings.
1 is a top plan view, FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 1, and FIG. 3 is a longitudinal sectional view corresponding to line BB in FIG. 2, and is a longitudinal section over all multiple throttle bodies. FIG.
[0014]
A single throttle body T consists of:
Reference numeral 1 denotes an intake passage that passes through the throttle body T, and the intake passage is controlled to be opened and closed by a throttle valve 3 attached to the throttle valve shaft 2.
Reference numeral 4 denotes a fuel injection valve support hole provided in the first support part 5 protruding to the side of the throttle body T. The upper opening thereof opens to the upper end 5A of the first support part 5, and the lower part is downstream of the throttle valve 3. Open in the side intake passage 1A.
Reference numeral 6 denotes a second support portion provided on the side of the throttle body T and above the first support portion 5. The second support portion 6 is provided with a locking portion 6 </ b> A protruding.
In this example, four single throttle bodies T are arranged on the side, and adjacent throttle bodies (first throttle body T1, second throttle body T2, third throttle body T3 from the left in FIG. 1) The throttle body T3 and the fourth throttle body T4) are positioned and fixed by a collar 8, a through bolt 9 and a nut 10.
Further, in the throttle valve shaft 2 of this example, a single shaft is used, and a throttle lever 11 that is operated by an accelerator is attached to an end portion thereof.
[0015]
Next, the fuel injection valve support member P will be described.
12A is a flow path formed inside the fuel injection valve support member P, and a fuel injection valve support hole 12C is opened from the flow path 12A toward one end 12B (downward in FIG. 2). .
Further, a fuel pipe support hole 12E is opened at the side end 12D of the fuel injection valve support member P, and the fuel pipe support hole 12E is formed in the flow path 12A via a locking step portion 12F. Opened in a row.
In addition, the fuel injection valve support member P is formed with an attachment flange portion 12G extending outward, and the attachment flange portion 12G is formed with a mounting hole 12H penetrating therethrough and further outside. An arm portion 12J having a bifurcated shape toward the direction is formed.
[0016]
The fuel injection valve support member P is fixedly disposed on each throttle body T1, T2, T3, T4 constituting the multiple throttle body.
That is, the first fuel injection valve support member P1 is disposed on the first throttle body T1, the second fuel injection valve support member P2 is disposed on the second throttle body T2, and the third fuel injection valve support is supported on the third throttle body T3. The member P3 is disposed, and the fourth fuel injection valve support member P4 is disposed on the fourth throttle body T4.
[0017]
Here, the fuel pipe support hole 12E of the first fuel injection valve support member P1 is provided to open only to the right side end 12D in FIG.
The fuel pipe support holes 12E of the second and third fuel injection valve support members P2, P3 are provided to open to the right and left side ends 12D.
Further, the fuel pipe support hole 12E of the fourth fuel injection valve support member P4 is provided to open only to the left side end 12D in FIG.
[0018]
The fuel injection valve support members P1 to P4 are fixedly disposed on the throttle bodies T1 to T4.
That is, the mounting rod portion 12G of the first fuel injection valve support member P1 is disposed on the second support portion 6 of the first throttle body T1, and in this state, the screw 13 is inserted through the mounting hole 12H of the mounting rod portion 12G. The first fuel injection valve support member P1 can be fixedly disposed on the mounting flange 12G of the first throttle body T1 by screwing toward the female screw hole 6B drilled in the second support portion 6.
[0019]
In this state, the upper cylinder portion J1 of the fuel injection valve J is inserted into the fuel injection valve support hole 12C of the first fuel injection valve support member P1, and the lower cylinder portion J2 is the fuel of the first throttle body T1. The fuel injection valve J is inserted and disposed in the injection valve support hole 4, and is thus sandwiched between the first fuel injection valve support member P <b> 1 and the first throttle body T <b> 1.
[0020]
Further, the bifurcated arm portions 12J, 12J of the first fuel injection valve support member P1 are locked to the side of the locking portion 6A of the first throttle body T1.
[0021]
The second, third, and fourth fuel injection valve support members P2, P3, and P4 are also fixedly disposed on the second, third, and fourth throttle bodies T2, T3, and T4 with screws 13 in the same manner as described above. Accordingly, the fuel injection valve J is also sandwiched between the fuel injection valve support members P2, P3, P4 and the corresponding throttle bodies T2, T3, T4.
[0022]
The fuel pipe F is disposed between the adjacent fuel injection valve support members as follows.
A fuel pipe support hole 12E that opens to the right side end 12D of the first fuel injection valve support member P1, and a fuel pipe support hole 12E that opens to the left side end 12D of the second fuel injection valve support member P2. A pipe-shaped first fuel pipe F1 having a flow passage through the inside is inserted and disposed.
In this embodiment, the first fuel pipe F1 is provided with a fuel supply path 15 connected to a fuel pump (not shown). (The fuel supply path 15 is shown in FIG. 1).
Also, a fuel pipe support hole 12E that opens to the right side end 12D of the second fuel injection valve support member P2, and a fuel pipe support that opens to the left side end 12D of the third fuel injection valve support member P3. The second fuel pipe F2 is inserted and arranged in the hole 12E.
Further, a fuel pipe support hole 12E that opens to the right side end 12D of the third fuel injection valve support member P3, and a fuel pipe support hole that opens to the right side end 12D of the fourth fuel injection valve support member P4. A third fuel pipe F3 is inserted into 12E.
A seal ring 16 such as an O-ring or a square ring is disposed between the fuel tube support hole 12E and the fuel tube F to prevent fuel leakage at the insertion portion.
[0023]
As a result, the assembly of the multiple throttle bodies is completed, and the fuel boosted by the fuel pump is supplied from the fuel supply passage 15 into the first fuel pipe F1. The fuel supplied to the first fuel pipe F1 is supplied into the flow path 12A of the first fuel injection valve support member P1, and then injected from the fuel injection valve J into the intake path 1A of the first throttle body T1. Is done.
[0024]
On the other hand, the fuel in the first fuel pipe F1 flows from the flow path 12A of the second fuel injection valve support member P2 → the second fuel pipe F2 → the flow path 12A of the third fuel injection valve support member P2 → the third fuel pipe F3 → It is supplied to the flow path 12A of the fourth fuel injection valve support member P4.
The fuel in the flow path 12A of the second fuel injection valve support member P2 is injected and supplied into the intake passage 1A of the second throttle body T2 via the fuel injection valve J, and the flow of the third fuel injection valve support member P3 The fuel in the passage 12A is injected and supplied through the fuel injection valve J into the intake passage 1A of the third throttle body T3, and the fuel in the passage 12A of the fourth fuel injection valve support member P4 passes through the fuel injection valve J. And injected into the intake passage 1A of the fourth throttle body T4.
[0025]
Here, in the present invention, when the center pitch of each throttle body constituting the multiple throttle body is changed, it is possible to cope with it very easily and inexpensively.
That is, when the center pitch is shortened with respect to the reference center pitch, it is possible to take measures by shortening the length of the fuel pipe. When the center pitch is increased with respect to the reference center pitch, This can be dealt with by increasing the length of the fuel pipe.
As described above, according to the present invention, when the center pitch of the throttle body is changed, it is only necessary to change the length of the fuel pipe, so that it is extremely inexpensive and can be easily handled in a short period of time.
[0026]
Further, the fuel injection valve support member P used in the present invention is individually disposed corresponding to each throttle body, and the length K in the direction along the fuel pipe support hole 12E can be shortened.
According to the above, since the fuel injection valve support member P can be reduced in size, it can be easily injection-molded using a synthetic resin material, thereby reducing weight and manufacturing cost. (Conventional fuel distribution pipes are formed across multiple throttle bodies, so the length along the fuel flow path is extremely long. The development cost and the management cost for maintaining the quality are required to produce
[0027]
Further, the flow path 12A formed in the fuel injection valve support member P does not require a diameter for inserting the fuel pipe F, and the side end 12D has a fuel pipe support hole 12E via the locking step portion 12F. Since the flow path diameter of the flow path 12A can be reduced, and the fuel pipe F can also have a flow path diameter penetrating through the inside thereof, the flow path diameter can be appropriately reduced. The fuel supplied from the pump can be immediately supplied into the fuel injection valve J, whereby the initial start response of the engine can be improved. (The fuel storage time in the flow path does not become longer due to the increased flow path diameter)
[0028]
Further, when the fuel injection valve support member P is screwed and fixed to the throttle body T with the screw 13, the arm portions 12J and 12J provided on the fuel injection valve support member P are attached to the locking portion 6A provided on the throttle body T. Since it is locked, the rotational direction of the fuel injection valve support member P is suppressed, and accurate positioning can be performed.
According to this, in particular, the fuel pipe support holes 12E and 12E opened at the side ends 12D of the adjacent fuel injection valve support members, for example, P2 and P3 can be arranged concentrically, and the fuel pipe F is connected to the fuel pipe support holes 12E and 12E. The workability of inserting into 12E can be greatly improved.
[0029]
Further, in a state where the fuel pipe F is inserted into the fuel pipe support holes 12E and 12E, the distance L1 from the insertion end Fa of the fuel pipe F to the locking step portion 12F is the fuel inserted into the fuel pipe support hole 12E. If the distance is less than the insertion distance L2 of the tube F, the insertion end Fa of the fuel tube F contacts the locking step portion 12F even when the fuel tube F moves to the side where it escapes from the fuel tube support hole 12E. The pipe F does not escape from the fuel pipe support hole 12E.
[0030]
In this example, the fuel pipe support hole 12E is not provided in the left side end of the first fuel injection valve support member P1 and the right side end of the fourth fuel injection valve support member P2. 20 (indicated by a one-dot chain line in FIG. 3) may be provided, and a fuel supply path connected to the fuel pump, a flow path connected to the pressure regulator, and a flow path connected to the damper valve may be connected to the fuel hole 20.
If it does in this way, all the fuel injection valve support members P can be shared.
[0031]
Further, in this example, the intake passage 1 is arranged in the vertical direction in FIG. 2, but it may be in a horizontal direction or an oblique direction, and the number of throttle bodies T is not limited as long as it is a multiple.
[0032]
【The invention's effect】
As described above, according to the fuel supply device in the multiple throttle body according to the present invention, the fuel injection valve support member has the fuel injection valve support hole that opens toward one end from the flow path formed inside,
A fuel pipe support hole that is continuous with the flow path and opens toward the side end,
A fuel injection valve support member is fixedly disposed on each throttle body facing each intake passage,
The fuel injection valves disposed toward the intake passages are sandwiched by fuel injection valve support holes formed in the throttle bodies and fuel injection valve support holes formed in the fuel injection valve support members, and are mutually connected. Since the fuel pipe is inserted and disposed in the opposed fuel pipe support hole of each adjacent fuel injection valve support member, it is extremely inexpensive and easy to cope with the change of the center pitch of the multiple throttle body and the fuel injection valve support There is no need to change any members.
[0033]
In addition, since the fuel injection valve support member can be reduced in size, the fuel injection valve support member can be formed of a synthetic resin material, which can reduce weight and reduce manufacturing cost. Can be increased.
[0034]
Further, the fuel injection valve support member is screwed and fixed to the throttle body with a screw, and the arm portion provided on the fuel injection valve support member is engaged with the engagement portion provided on the throttle body, so that the adjacent fuel injection The opposing fuel pipe support holes of the valve support member can be arranged concentrically, and the workability of inserting the fuel pipe into the fuel pipe support hole can be improved.
[0035]
Furthermore, in the state where the fuel pipe is inserted into the fuel pipe support hole, the distance from the insertion end of the fuel pipe to the locking step is made smaller than the insertion distance of the fuel pipe inserted into the fuel pipe support hole. The fuel pipe can be securely accommodated in the fuel pipe support hole.
[Brief description of the drawings]
FIG. 1 is a top plan view of a fuel supply device in a multiple throttle body according to the present invention.
FIG. 2 is a longitudinal sectional view taken along line AA in FIG.
3 is a longitudinal sectional view corresponding to the line BB in FIG. 2 and is a longitudinal sectional view extending over all of the multiple throttle bodies.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake path 4 Fuel injection valve support hole 6A Locking part 12A Flow path 12C Fuel injection valve support hole 12D Side end 12E Fuel pipe support hole 12J Arm part 13 Screw P Fuel injection valve support member T Throttle body F Fuel pipe

Claims (4)

Plural throttle bodies with intake passages that are opened and closed by throttle valves are arranged on the sides,
In the multiple throttle body in which each throttle valve is synchronously interlocked and the fuel injection valve is arranged toward the intake passage of each throttle body ,
The throttle body T protrudes laterally, and has a first support portion 5 in which a fuel injection valve support hole 4 is formed which opens from the upper end 5A into the intake passage 1A on the downstream side of the throttle valve 3, and the first support. A second support portion 6 formed above the portion,
The fuel injection valve support member P includes a fuel injection valve support hole 12C that opens from the flow path 12A formed inside to the one end 12B,
A fuel pipe support hole 12E that opens from the flow path 12A toward the side end 12D thereof , and
Each fuel injection valve support member P, by fixing arranged on the second supporting portion 6 of each throttle body T1, T2 ···,
The fuel injection valve J is inserted and held between the fuel injection valve support hole 12C of the fuel injection valve support member P and the fuel injection valve support hole 4 of the throttle body T,
Further, a fuel supply device for a multiple throttle body, characterized in that a pipe-like fuel pipe F having a passage through the inside thereof is inserted and disposed in the opposing fuel pipe support holes of the fuel injection valve support members adjacent to each other.   The fuel supply device for a multiple throttle body according to claim 1, wherein the fuel injection valve support member is formed of a synthetic resin material.   The fuel injection valve support member is screwed and fixed to the throttle body T with a screw 13, and the arm portion 12J provided on the fuel injection valve support member P is engaged with an engagement portion 6A provided on the throttle body T. 2. A fuel supply apparatus for a multiple throttle body according to claim 1, wherein rotational movement of the fuel injection valve support member P in the rotational direction of the screw 13 is suppressed. The fuel pipe support hole is drilled from the side end 12D of the fuel injection valve support member P toward the flow path 12A via the locking step portion 12F.
In a state where the fuel pipe F is inserted into the fuel pipe support hole 12E, a distance L1 from the insertion end Fa of the fuel pipe F to the locking step portion 12F is set to be inserted into the fuel pipe support hole 12E. The fuel supply device for a multiple throttle body according to claim 1, wherein the fuel supply device is smaller than the distance L2.

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