JP3845197B2 - Holding structure for fuel distribution pipe of electromagnetic fuel injection valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for holding an electromagnetic fuel injection valve in a fuel distribution pipe, which holds an electromagnetic fuel injection valve in which an inlet cylinder is fitted to a fuel supply boss.
[0002]
[Prior art]
Conventionally, as such a holding structure, a pair of slits are formed on both side walls of the fuel supply boss of the fuel distribution pipe, and an annular groove is formed on the outer periphery of the inlet pipe of the electromagnetic fuel injection valve. In this fitting state, the one in which the split pin is engaged with the slit and the annular groove is known (for example, see Japanese Patent Application Laid-Open No. Sho 56-12051).
[0003]
[Problems to be solved by the invention]
In the conventional structure as described above, it is necessary to specially process the slit and the annular groove in the fuel supply boss and the inlet pipe, and there is a problem that it is difficult to reduce the manufacturing cost.
[0004]
The present invention has been made in view of such circumstances, and the holding structure capable of easily holding the electromagnetic fuel injection valve in the fuel distribution pipe without subjecting the electromagnetic fuel injection valve to special processing. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fuel distribution pipe holding structure for a fuel distribution pipe that holds an electromagnetic fuel injection valve in which an inlet cylinder is fitted to the fuel supply boss. The base portion of the electric coupler is molded in a bowl shape on the outer peripheral surface of the housing of the electromagnetic fuel injection valve, and one side ends of the first and second sandwiching pieces facing each other are integrally connected by a side plate. The U-shaped holder is attached to the fuel injection valve and the fuel distribution pipe so as to hold the fuel injection valve in the fuel distribution pipe by elastically holding the coupler base and the fuel distribution pipe by the holding pieces. The side plate of the holder is provided with a window hole and a positioning recess that opens at one side edge of the window hole, and the connection portion of the electric coupler faces the window hole with a gap therebetween, and One side of the base of the coupler in the positioning recess is an electromagnetic fuel injection valve That engaged as may be prevented from rotating about the axis and first feature.
[0006]
According to the first feature, the electromagnetic fuel injection valve can be easily held in the fuel distribution pipe by elastically holding the coupler base and the fuel distribution pipe by the first and second holding pieces of the holder. it can. As described above, since the electric coupler is used to hold the fuel injection valve in the fuel distribution pipe , it is not necessary to perform special processing on the fuel injection valve. In particular, the side plate of the holder is provided with a window hole and a positioning recess that opens at one side edge of the window hole, and the connection portion of the electric coupler faces the window hole with a gap therebetween. Since one side portion of the base portion of the coupler is engaged to prevent rotation around the axis of the fuel injection valve, the coupler connecting portions of the plurality of fuel injection valves can be aligned in a certain direction, and the intake manifold The operation of aligning the positions of the coupler connecting portions of the plurality of fuel injection valves is not necessary after the mounting to the device, and the fear of misassembly is eliminated. In addition, since the coupler connecting portion faces the window hole of the holder side plate with a gap between them, another external coupler can be connected to the coupler connecting portion without any interruption.
[0007]
In addition to the above-described features, the present invention provides a locking projection formed on the side surface of the fuel distribution pipe opposite to the supply boss, while the second clamping piece abutting on the fuel distribution pipe is provided with the locking projection. A second feature is that a locking claw to be engaged is provided.
[0008]
According to the second feature, the mounting state of the holder to the electromagnetic fuel injection valve and the fuel distribution pipe can be easily and reliably held by the engagement of the locking protrusion and the locking claw .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0010]
1 is a side view showing a state where an electromagnetic fuel injection valve is mounted on an engine, FIG. 2 is an enlarged longitudinal sectional view of the electromagnetic fuel injection valve, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIG. 4 is a cross-sectional view taken along line 5-5 of FIG. 3, FIG. 6 is a perspective view of the holder, and FIG. 7 is a cross-sectional view corresponding to FIG.
[0011]
1 and 2, reference numeral 1 denotes a cylinder block of a multi-cylinder engine for automobiles. A cylinder head 2 joined to the cylinder block 2 includes a combustion chamber 3 and an intake port connected to the cylinder chamber 2 corresponding to each cylinder. 4 is formed, and an intake valve 6 for opening and closing the intake port 4 is provided.
[0012]
An intake manifold 5 connected to the intake port 4 is joined to one side of the cylinder head 2, and an electromagnetic fuel injection valve I is attached to the intake manifold 5 corresponding to each cylinder, and fuel is sucked from the fuel injection valve I. It is injected toward the exit of port 4.
[0013]
The electromagnetic fuel injection valve I includes a substantially cylindrical housing 11 made of a magnetic material having an upper end wall and an open lower end surface. Inside, a bobbin 13 around which the coil 12 is wound, a yoke 14 that supports the lower end of the bobbin 13, and an injector body 16 that is adjacent to the lower end of the yoke 14 with a stopper plate 15 interposed therebetween are sequentially fitted, and It is fixed by caulking the lower end of the housing 11.
[0014]
A hollow fixed iron core 18s fitted in the bobbin 13 and an inlet cylinder 22 projecting upward from the housing 11 are integrally connected to the center of the upper end wall of the housing 11, and a spring seat tube is connected to the fixed iron core 18s. 19 is fitted and a filter 23 is attached to the inlet tube 22.
[0015]
The injector body 16 includes a flange portion 16a that is caulked and coupled to the lower end portion of the housing 11 that supports the stopper plate 15, and a barrel portion 16b that protrudes from the lower end surface of the flange portion 16a. Are provided with a guide hole 24 opened at the upper end surface of the flange portion 16a, a conical valve seat 25 connected to the lower end thereof, and a fuel injection hole 26 penetrating through the center portion and opened at the tip of the body portion 16b. A needle valve 21 that passes through the through groove 15 a of the stopper plate 15 is disposed in the guide hole 24. The needle valve 21 is opposed to a pair of upper and lower guide portions 21 a and 21 a slidably fitted in the guide hole 24, a valve portion 21 b corresponding to the valve seat 25, and the lower surface of the stopper plate 15. And a movable iron core 18m facing the lower end of the fixed iron core 18s is fixed. Between the movable iron core 18m and the spring seat tube 19, a valve spring 20 for urging the movable iron core 18m is contracted to seat the valve portion 21b on the valve seat 25.
[0016]
A male coupler 27 (electrical coupler) for supplying power to the coil 12 is formed on the upper side of the housing 11, and a female coupler 28 connected to an energization control device (not shown) is coupled thereto.
[0017]
On the upper wall of the intake manifold 5, there is an injection window 30 directed to the outlet of the intake port 4 corresponding to each cylinder, and a circular mounting recess that continues to the outer end of the injection window 30 and opens on the outer surface of the upper wall. 31 and an elastic seal member 33 is fitted into the recess 31.
[0018]
The injector body 16 is disposed in the injection window 30 with its fuel injection hole 26 directed toward the intake port 4. Then, a pressing flange 35 protruding integrally with the outer periphery of each housing 11 is overlaid on the upper surface of the housing 11 so as to press the elastic seal member 33.
[0019]
The inlet cylinder 22 of the fuel injection valve I is fitted to the inner peripheral surface of the fuel supply boss 40a of the fuel distribution pipe 40 arranged along the arrangement direction of the cylinders of the engine via a seal member 39. At this time, a first insulator collar 41 is interposed between the fuel distribution pipe 40 and the male coupler 27. The fuel distribution pipe 40 is provided with a plurality of mounting bosses 40b on one side, and these are fixed to the support bosses 43 on the outer surface of the intake manifold 5 with bolts 44 with the second insulator collar 42 interposed therebetween. The tightening force of the bolt 44 on the fuel distribution pipe 40 is applied to the electromagnetic fuel injection valve I through the first insulator collar 41 in the axial direction, and the pressing flange 35 presses the elastic seal member 33, and a certain compression is applied thereto. Give deformation. As a result, the elastic seal member 33 spreads inward and outward in the radial direction, is brought into close contact with the inner peripheral surface of the mounting recess 31 and the outer peripheral surface of the housing 11, and performs a seal therebetween.
[0020]
By the way, the fuel injection valve I is held in the fuel distribution pipe 40 by the holding structure of the present invention before being attached to the intake manifold 5, and the structure will be described with reference to FIGS.
[0021]
As shown in FIGS. 2 and 3, in the fuel injection valve I, the male coupler 27 is made of synthetic resin, and has a bowl-shaped coupler base portion 27a molded on the outer peripheral surface of the intermediate portion of the housing 11, and the coupler base portion. 27a, and a coupler connecting portion 27b that incorporates a terminal 29 that protrudes from one side surface and continues to the coil 12. The coupler base portion 27a is formed with both flat side surfaces 45, 45 extending in the protruding direction of the coupler connecting portion 27b.
[0022]
On the other hand, a locking projection 46 extending in the longitudinal direction of the fuel distribution pipe 40 is formed on the upper surface of the fuel distribution pipe 40 opposite to the fuel supply boss 40a.
[0023]
The fuel injection valve I is held in the fuel distribution pipe 40 by the holder 47 using the male coupler 27 and the locking projection 46.
[0024]
In FIG. 6, a holder 47 is press-formed from a steel plate and integrally connects the first holding piece 48 ₁ and the second holding piece 48 ₂ that are opposed to each other in the vertical direction and one end thereof. It consists of a side plate 49.
[0025]
As shown in FIGS. 3 to 6, the first holding piece 48 _1, the one that abuts against the lower surface of the coupler base 27a, cut-out U-shaped capable of receiving the housing 11 is open at its distal end 50 Is provided. The second clamping piece 48 ₂ is for contact with the upper surface of the fuel distribution pipe 40, to its distal end, the locking claw 51 engageable with the locking projection 46 is formed. In order to maintain the engagement, an elastic force is applied to the first and second sandwiching pieces 48 ₁ and 48 ₂ so that they are close to each other. The side plate 49 has a window hole 52 for allowing the coupler connecting portion 27b to face the gap, and a positioning recess 53 that opens at a lower edge of the window hole 52 and engages one side portion of the coupler base portion 27a. Is formed.
[0026]
Thus, after the inlet cylinder 22 of the fuel injection valve I is fitted to the fuel supply boss 40a of the fuel distribution pipe 40 via the seal member 39, the holder 47 has the first and second clamping pieces 48 ₁ , 48 _2. Is attached so as to sandwich the male coupler 27 and the fuel distribution pipe 40. That is, passed through the coupler connecting portion 27a to the window hole 52 of the side plate 49, while engaging the positioning recess 53 on one side of the coupler base 27a, is brought into contact with the first holding piece 48 ₁ to the lower surface of the coupler base 27a together, if the second clamping piece 48 _{and second} locking claws 51 engaged with the engaging projection 46 of the fuel distribution pipe 40, by the elastic force of the supporting pieces 48 _1, 48 _2, locking claws 51 and the engaging The engagement state of the protrusion 46 and the engagement state of the fuel injection valve I with the fuel distribution pipe of the inlet cylinder 22 can be maintained. Further, both side surfaces of the positioning recess 53 of the holder 47 abut on the flat side surfaces 45, 45 of the coupler base 27a, so that rotation around the axis of the fuel injection valve I can be prevented.
[0027]
Thus, the fuel supply system assembly A is configured by mounting and holding the plurality of fuel injection valves I on the fuel distribution pipe 40. Therefore, the fuel injection valve I can be prevented from dropping from the fuel distribution pipe 40 during transportation and handling of the assembly A. This means that when the fuel distribution pipe 40 is removed from the intake manifold 5 for inspection and maintenance after the engine is operated, all the fuel injection valves I are removed from the intake manifold 5 together with the fuel distribution pipe 40. This means that natural separation between the pipe 40 and each fuel injection valve I can be prevented. Therefore, fuel leakage from the fuel supply boss 40a due to the natural separation can be avoided. Moreover, since the male coupler 27 itself is used to hold the fuel injection valve I, it is not necessary to perform special processing on the fuel injection valve I, and the manufacturing cost can be reduced.
[0028]
Further, by preventing the rotation of the fuel injection valve I by the engagement between the positioning recess 53 of the holder 47 and the coupler base portion 27a, the protruding direction of the coupler connecting portion 27b can be regulated to be constant, so that in the state of the fuel supply system assembly. The coupler connecting portions 27b of the plurality of fuel injection valves I are aligned. Therefore, after the fuel supply system assembly A is attached to the intake manifold 5, the positions of the coupler connecting portions 27b of the plurality of fuel injection valves I are aligned. There is no need for work, and there is no need to worry about misassembly. In addition, the external female coupler 27 can be connected to the coupler connecting portion 27 b facing the window hole 52 of the side plate 49 of the holder 47 with a gap therebetween without being obstructed by the holder 47.
[0029]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, as shown in FIG. 7, the inlet sides of the first holding piece 48 ₁ of notches 50, to form a pair of projections 55 and 55 facing each, the housing 11 of the fuel injection valve I in the notch 50 when inserting, the first clamping piece 48 ₁ One given elastic deformationゝis passed between the projections 55 and 55, after insertion, can be difficult to come off. The holder 47 can be made of synthetic resin.
[0030]
【The invention's effect】
As described above, according to the first feature of the present invention, the base portion of the electric coupler is molded in a bowl shape on the outer peripheral surface of the housing of the electromagnetic fuel injection valve, and the first and second sandwiching pieces facing each other are formed. A U-shaped holder formed by integrally connecting one end to each other with a side plate, the coupler base and the fuel distribution pipe are elastically held by both holding pieces to hold the fuel injection valve in the fuel distribution pipe. In addition, since it is mounted on the fuel injection valve and the fuel distribution pipe, an electric coupler of its own is used to hold the electromagnetic fuel injection valve in the fuel distribution pipe , and the fuel injection valve needs to be specially processed. In addition, the structure is simple and can be provided at low cost. In particular, the side plate of the holder is provided with a window hole and a positioning recess that opens at one side edge of the window hole, and the connection portion of the electric coupler faces the window hole with a gap therebetween. Since one side portion of the base portion of the coupler is engaged to prevent rotation around the axis of the fuel injection valve, the coupler connecting portions of the plurality of fuel injection valves can be aligned in a certain direction, and the intake manifold The operation of aligning the positions of the coupler connecting portions of the plurality of fuel injection valves is not necessary after the mounting to the device, and the fear of misassembly is eliminated. In addition, since the coupler connecting portion faces the window hole of the holder side plate with a gap between them, another external coupler can be connected to the coupler connecting portion without any interruption.
[0031]
Further, according to the second feature of the present invention, the locking projection is formed on the side surface of the fuel distribution pipe opposite to the supply boss, while the second clamping piece abutting on the fuel distribution pipe is provided with the locking projection. Since the engaging claw to be engaged is provided, the attachment state of the holder to the electromagnetic fuel injection valve and the fuel distribution pipe can be easily and reliably held by the engagement of the engaging protrusion and the engaging claw .
[Brief description of the drawings]
1 is a side view showing a state where an electromagnetic fuel injection valve is mounted on an engine, FIG. 2 is an enlarged longitudinal sectional view of the electromagnetic fuel injection valve, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIG. 4 is a sectional view taken along line 4-4, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, FIG. 6 is a perspective view of the holder, and FIG. 7 is a sectional view corresponding to FIG.
FIG. 1 is a side view showing a state where an electromagnetic fuel injection valve is mounted on an engine.
FIG. 2 is an enlarged longitudinal sectional view of an electromagnetic fuel injection valve.
FIG. 3 is an enlarged view of a main part of FIG.
4 is a view taken in the direction of arrow 4 in FIG. 3;
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a perspective view of a holder.
FIG. 7 is a cross-sectional view corresponding to FIG. 5, showing a modification of the holder.
[Explanation of symbols]
A ... Fuel supply system assembly I ... Electromagnetic fuel injection valve H ... Holding means 11 ... Housing 22 ... Inlet tube 27 ... Electric coupler (Male coupler)
27a: Coupler base 27b: Coupler connection 40 ... Fuel distribution pipe 40a ... Supply boss 46 ... Locking protrusion 47 ... Holder 48 ₁ ... First clamping piece 48 ₂ ... 2nd clamping piece 49... Side plate 50... Notch 51.

Claims (2)

A structure for holding an electromagnetic fuel injection valve (I) in which an inlet cylinder (22) is fitted to the fuel supply boss (40a) of the fuel distribution pipe (40) to the fuel distribution pipe. Because
On the outer peripheral surface of the housing (11) of the electromagnetic fuel injection valve (I), the base (27a) of the electric coupler (27) is molded in a bowl shape, and the first and second sandwiching pieces (48 ₁ , 48 ₁ , 48) facing each other are molded. 48 ₂ ), a U-shaped holder (47) formed by integrally connecting one end of each side with a side plate (49), the coupler base (27a) and the fuel by means of both sandwiching pieces (48 ₁ , 48 ₂ ). the distribution pipe (40) to hold the fuel distribution pipe by elastically clamping (40) the fuel injection valve (I), attached to the fuel injection valve (I) and the fuel distribution pipe (40), the holder The side plate (49) of (47) is provided with a window hole (52) and a positioning recess (53) that opens at one side edge of the window hole (52). The connecting portion (27a) of the coupler (27) is faced with a gap, and the positioning recess (53) The one side of the base portion (27a) of the coupler (27), and wherein the engaged so as to prevent rotation about the axis of the electromagnetic fuel injection valve (I), the fuel electromagnetic fuel injection valve Holding structure to distribution pipe. According to claim 1,
A locking projection (46) is formed on the side surface of the fuel distribution pipe (40) opposite to the supply boss (40a), while a second clamping piece (48 ₂ ) that abuts the fuel distribution pipe (40), A holding structure for a fuel distribution pipe of an electromagnetic fuel injection valve, characterized in that a locking claw (51) that engages with the locking projection (46) is provided .

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