JP2005207233A - Mounting structure of fuel injection valve in fuel distribution pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To position the rotating direction of a fuel injection valve relative to a fuel distribution pipe and easily mount the fuel injection valve in the fuel distribution pipe. <P>SOLUTION: The fuel connector part 1 of the fuel injection valve J is inserted, liquid-tight, into the fuel injection valve insert hole 13 of the fuel distribution pipe D, a positioning projected part 6 formed on the fuel injection valve J is inserted into a guide groove 19 bored in the guide hole 12 of the fuel distribution pipe D and disposed to position the fuel injection valve J in the rotating direction. On the other hand, the locking bent part 20c at the upper end of an elastic locking pin P formed of a spring material in a fork shape is locked to the locking projected part 16 of the fuel distribution pipe D, the semi-circular parts 20e and 20e at the lower end thereof are divergently disposed on the outer periphery of a housing 3 facing the lower surface 4a of the annular flange part 4 of the fuel injection valve J, and the fuel injection valve J is mounted in the fuel distribution pipe D with the elastic locking pin P. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the fuel in the fuel tank is boosted by an electromagnetic fuel pump and supplied to the fuel flow path in the fuel distribution pipe, and the fuel in the fuel flow path is passed through the fuel injection valve attached to the fuel distribution pipe. More particularly, the present invention relates to a structure for mounting a fuel injection valve to a fuel distribution pipe.

For example, Japanese Patent Application Laid-Open No. 2001-193600 filed by the applicant of the present application discloses such a structure for attaching the fuel injection valve to the fuel distribution pipe.
According to this, an annular connecting groove is formed in the outer peripheral surface of the intermediate portion of the fuel injection valve, while a connecting flange aligned with the connecting groove in the axial direction is formed in the fuel supply port, and the fuel injection valve and the fuel supply port are provided on both outer sides The connecting member that is elastically pinched from the bottom is provided with a flange and a locking groove to be engaged with the connecting groove and the connecting flange, respectively, and a positioning hole is provided in the connecting flange, while positioning is performed simultaneously with the insertion of the fuel inlet to the fuel supply port. A positioning projection that engages with the hole is formed on the fuel injection valve.
JP 2001-193600 A

In such a conventional device, the connecting groove of the fuel injection valve is used to connect to the fuel supply port in the axial direction by a connecting member. The connecting member includes a pair of side plate portions facing each other, It is formed in a U shape from a connecting plate portion that integrally connects one end of the side plate portion to each other, and is further formed of a steel plate or a synthetic resin material so as to have an appropriate elasticity as a whole.
According to the above, when the steel plate is used as the material when forming the connecting member, a press punching die and a press bending die are required, whereas when a synthetic resin material is used as the material, resin molding A mold is required.
As described above, when each mold is prepared, it is difficult to reduce the manufacturing cost of the connecting member, which leads to an increase in the manufacturing cost of the fuel injection device, which is not preferable.

  The present invention has been made in view of the above-described problems. When the fuel injection valve is attached to the fuel distribution pipe, the fuel injection valve is positioned in the rotational direction, and the mounting operation is extremely simple and the parts cost is low. Another object of the present invention is to provide a structure for attaching a fuel injection valve to a fuel distribution pipe that can be attached with a connecting member.

In order to achieve the above object, the present invention has a fuel injection portion formed at the lower end, a fuel connector portion formed at the upper end, and an annular flange portion formed in the housing connecting the fuel injection portion and the fuel connector portion. A fuel injection valve having a positioning projection formed outwardly above the annular flange;
An injection valve insertion hole that opens toward the fuel flow path bored in the fuel boss, and a guide hole that opens continuously from the injection valve insertion hole.
A fuel distribution pipe provided with a guide groove formed on the outer periphery of the guide hole and opening toward the lower end of the guide hole; and a locking projection formed on the fuel boss;
A bifurcated opening formed in a bifurcated shape by a spring material and formed from the lower ends of a pair of vertical portions extending in the vertical direction toward the side,
A semicircular portion having a diameter smaller than the outer diameter A of the annular flange and having the same diameter as or slightly smaller than the outer diameter B of the housing 3 is formed and is formed from the upper end of the vertical portion toward the side. An elastic locking pin having a U-shaped locking bent portion formed on the connecting base;
Composed of
The fuel tank portion of the fuel injection valve is liquid-tightly inserted into the fuel insertion hole of the fuel distribution pipe, and the positioning projection is inserted and disposed in the guide groove of the fuel distribution pipe, while the elastic bending pin is locked. And a semi-circular portion that is expanded and arranged on the outer periphery of the housing facing the lower surface of the annular flange.

According to this feature, the fuel connector portion of the fuel injection valve is inserted into the injection valve insertion hole through the guide hole of the fuel distribution pipe, and at the same time, the positioning protrusion of the fuel injection valve is inserted into the guide groove of the fuel distribution pipe. The rotation of the fuel injection valve is regulated by this.
In addition, the locking bent portion of the elastic locking pin is locked to the locking protrusion of the fuel distribution pipe, and the semicircular portion of the bifurcated opening is fitted and disposed on the outer periphery of the housing and the lower surface of the annular flange portion By being disposed in contact with the fuel, the movement of the fuel injection valve in the longitudinal axis direction is restricted, and the fuel injection valve is attached to the fuel distribution pipe.
According to the above, the fuel connector portion of the fuel injection valve is inserted and arranged in the guide hole of the fuel distribution pipe, the injection valve insertion hole, and the elastic locking pin is mounted toward the fuel distribution pipe and the fuel injection valve. Since the fuel injection valve can be attached to the fuel distribution pipe, the mounting workability can be greatly improved.
Further, the elastic locking pin is formed by bending with a spring material, and a special mold is not required for the bending, so that the elastic locking pin can be manufactured at a low cost, and the mounting workability is improved. Manufacturing costs can be reduced.

  Embodiments of the present invention will be described based on examples of the present invention shown in the drawings.

1 is a front view of a fuel injection valve, FIG. 2 is a right side view of FIG.
3 is a longitudinal sectional view of the fuel distribution pipe, FIG. 4 is a right side view of FIG.
5 is a front view of the elastic locking pin, FIG. 6 is a top plan view of FIG.
FIG. 7 is a right side view of FIG.

First, the fuel injection valve J will be described with reference to FIGS.
The fuel injection valve J has a fuel connector portion 1 formed at its upper end, a fuel injection portion 2 formed at its lower end, and the fuel connector portion 1 and the fuel injection portion 2 are connected by a cylindrical housing 3.
An annular flange 4 is formed at a substantially middle portion of the housing 3, and a coupler portion 5 is formed obliquely upward on the left side of the annular flange 4.
The outer diameter A of the annular flange 4 has a larger diameter than the outer diameter B of the housing 3.
In addition, a positioning projection 6 is formed in the vicinity of the fuel connector portion 1 above the annular flange 4 so as to protrude rightward.
In FIG. 1, the positioning protrusion 6 protrudes toward the right side from the outer periphery of the fuel connector portion 1, and its tip slightly extends upward and is formed with a width C.
A first seal ring groove 1 a is formed on the outer periphery of the fuel connector portion 1 above the positioning protrusion 6, and a second seal ring groove 2 a is formed on the fuel injection portion 2.
The internal structure of the fuel injection valve J is conventionally known, and includes a solenoid coil, a core, a needle valve, and the like. A fuel inlet is opened at the upper end of the fuel connector portion 1, and the fuel injection portion 2. A nozzle hole is opened at the lower end of.

Next, the fuel distribution pipe D will be described with reference to FIGS.
The fuel distribution pipe D is formed of aluminum, a zinc alloy, or a synthetic resin material.
The fuel distribution pipe D has a fuel flow path 11 formed in a lateral direction, and a guide hole 12 and an injection valve insertion hole 13 are connected to the fuel boss 15 from below in the fuel flow path 11 in FIG. Established. In this example, the guide hole 12 and the injection valve insertion hole 13 are formed to have the same diameter, but if the guide hole 12 is made larger than the injection valve insertion hole 13, the fuel connector portion 1 of the fuel injection valve J is connected to the injection valve insertion hole 13. When inserted in, it can be easily inserted.
In addition, a locking projection 16 extending leftward in FIG. 3 is formed on the outer periphery above the fuel distribution pipe D. The fuel flow path 11 is supplied with fuel whose pressure has been increased by an electromagnetic fuel pump (not shown).
In FIG. 3, an attachment flange 17 is formed extending from the fuel boss 15 toward the right side. An attachment hole 18 is drilled through the attachment flange 17.
Further, a guide groove 19 is notched on the outer periphery of the guide hole 12, and the guide groove 19 is formed to open toward the lower end 12a of the guide hole 12, and the groove width D of the guide groove 19 is as follows. The positioning protrusion 6 formed on the fuel injection valve J is formed slightly larger than the width C.
In FIG. 4, one injection valve insertion hole 13 including the guide hole 12 is formed, but a plurality of these may be arranged along the longitudinal axis of the fuel flow path 11.

Next, the elastic locking pin P will be described with reference to FIGS.
The elastic locking pin P is bent into a bifurcated shape by a spring material.
Reference numerals 20a and 20a denote a pair of vertical portions that are opposed to each other with a gap E in the vertical direction, and the upper portions of the vertical portions 20a and 20a are substantially semicircular toward the left so as to surround the upper outer periphery of the fuel distribution pipe D. A U-shaped locking bent portion 20c is formed on the connecting base portion 20b formed at the left end of the connecting base portion 20b. (The upper ends of the pair of vertical portions 20a and 20a are connected by the connection base portion 20b)
Further, the lower part of the vertical parts 20a, 20a opens to the left side with two-forked openings 20d, 20d, and the two-forked openings 20d, 20d are formed in the annular flange 4 of the fuel injection valve J. Semicircular portions 20e and 20e that are smaller than the outer diameter A and have the same diameter as the outer diameter B of the housing 3 or slightly smaller diameter are formed to face each other.
In addition, curved portions 20f and 20f that are bent upward and downward in FIG. 6 are formed at the left ends of the bifurcated openings 20d and 20d.

And the fuel injection valve J is attached to the fuel distribution pipe D by the following.
First, the fuel injection valve J is attached to the fuel distribution pipe D with the elastic locking pin P, and then the fuel distribution pipe D including the fuel injection valve J is attached to the intake pipe K.
The attachment of the fuel injection valve J and the fuel distribution pipe D will be described with reference to FIG.
A first O-ring 21 for airtight sealing is disposed in the first seal ring groove 1a of the fuel injection valve J, and a second O-ring 22 for airtight sealing is disposed in the second seal ring groove 2a.
The first and second O-rings 21 and 22 are not limited to O-rings, and a ring-shaped seal ring such as a square ring may be used.
The fuel connector portion 1 of the fuel injection valve J, to which the first O-ring 21 is mounted, is disposed by being inserted into the guide hole 12 and the injection valve insertion hole 13 from the lower end 12a of the guide hole 12 of the fuel distribution pipe D.
According to the above, the fuel connector portion 1 is disposed in the injection valve insertion hole 13, and the outer periphery of the fuel connector portion 1 and the injection valve insertion hole 13 are hermetically supported by the elastic deformation of the first O-ring 21. The
On the other hand, the positioning protrusion 6 of the fuel injection valve J is inserted from the lower end 12a of the guide hole 12 into the guide groove 19 of the fuel distribution pipe D, whereby the rotation of the fuel injection valve J is restricted.
In this state, the locking bent portion 20c formed on the connection base portion 20b of the elastic locking pin P is hooked and locked on the locking projection 16 of the fuel distribution pipe D. The elastic locking pin P This state is indicated by a one-dot chain line in FIG.
Next, the elastic locking pin P in the above state is rotated clockwise with reference to the locking protrusion 16 in FIG.
According to the clockwise rotation of the elastic locking pin P, the distal ends of the curved portions 20f and 20f of the bifurcated openings 20d and 20d of the elastic locking pin P first come into contact with the housing 3 of the fuel injection valve J. When the stop pin P is rotated in the clockwise direction, the curved portions 20f and 20f expand along the housing 3, and finally the semicircular portions 20e and 20e are fitted and arranged on the outer periphery of the housing 3. The circular portions 20e and 20e are disposed in contact with the lower surface 4a of the annular flange 4 of the fuel injection valve J.
The state of the elastic locking pin P is indicated by a solid line in FIG. 8. According to this, the upper end of the elastic locking pin P has a locking bent portion 20c on the locking projection 16 of the fuel distribution pipe D. Since the lower end of the elastic locking pin P is locked to the lower surface 4a of the annular flange 4 of the fuel injection valve J by the semicircular portions 20e, 20e, the fuel injection valve J is in the longitudinal axis direction. In this case, the fuel does not escape from the fuel distribution pipe D.
In other words, the fuel connector portion 1 of the fuel injection valve J can be reliably disposed in the injection valve insertion hole 13 of the fuel distribution pipe D.

As described above, the fuel injection valve J is attached to the fuel distribution pipe D by the elastic locking pin P, and this fuel distribution pipe D is attached to the intake pipe K connected to the engine by the following.
Referring to FIG. 9, the fuel injection portion 2 of the fuel injection valve J is inserted into a fuel injection hole 30 that opens into the intake pipe K. At this time, the fuel injection portion 2 and the fuel injection hole 30 are in the second seal ring groove. The second O-ring 22 disposed in 2a is held in an airtight state by elastic deformation.
On the other hand, the mounting flange 17 of the fuel distribution pipe D is disposed on the mounting boss 31 protruding from the intake pipe K, and the bolt 32 is screwed to the mounting boss 31 through the mounting hole 18, thereby A fuel distribution pipe D is fixedly disposed on the intake pipe K.
The elastic locking pin P may be removed by rotating counterclockwise immediately before the fuel distribution pipe D to which the fuel injection valve J is attached is attached to the intake pipe K, or the fuel distribution pipe D may be removed from the intake pipe K. The elastic locking pin P removed in this way can be used again.
In a state where the fuel distribution pipe D is attached to the intake pipe K, the fuel injection valve J is held between the fuel distribution pipe D and the intake pipe K, so that there is no problem even if the elastic locking pin P is removed.

As described above, according to the present invention, by inserting the fuel connector portion of the fuel injection valve into the injection valve insertion hole including the guide hole of the fuel distribution pipe, the positioning projection of the fuel injection valve is guided to the fuel distribution pipe. Since it can be inserted into the groove, the rotation of the fuel injection valve can be reliably regulated and attached to the fuel distribution pipe, and the fuel injection valve is locked to the locking projection of the fuel distribution pipe and the fuel injection valve Since the fuel injection valve is supported by an elastic locking pin that is locked to the lower surface of the annular flange portion, the fuel injection valve is not detached from the fuel distribution pipe in the longitudinal axis direction, and the fuel injection valve is securely attached to the fuel distribution pipe. I can support it.
In particular, since the elastic locking pin is bent using a spring material, the elastic locking pin can be manufactured at a low cost by eliminating the need for a press die, a bending die, and a molding die. This has a great effect on reducing the overall price of the product.
Further, the attaching operation of the elastic locking pin may be performed by rotating the locking bending portion as a starting point by utilizing the spring characteristic of the elastic locking pin, and is effective in improving the mounting workability.

The front view of the fuel injection valve used for this invention. The right view of FIG. The longitudinal cross-sectional view of the fuel distribution pipe used for this invention. FIG. 4 is a right side view of FIG. 3. The front view of the elastic locking pin used for this invention. FIG. 6 is a top plan view of FIG. 5. The right view of FIG. The principal part longitudinal cross-sectional view which shows the state by which the fuel injection valve was attached to the fuel distribution pipe by the elastic latching pin. The principal part longitudinal cross-sectional view which shows the state by which the fuel distribution pipe provided with the fuel injection valve was attached to the intake pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel connector part 2 Fuel injection part 3 Housing 4 Annular collar part 6 Positioning protrusion 11 Fuel flow path 13 Injection valve insertion hole 16 Locking protrusion 19 Guide groove 20a Vertical part 20b Connection base part 20c Locking bending part 20d Two-way opening Part 20e Semicircular part D Fuel distribution pipe J Fuel injection valve K Intake pipe P Elastic locking pin

Claims (1)

A fuel injection portion 2 is formed at the lower end, a fuel connector portion 1 is formed at the upper end, an annular flange portion 4 is formed in the housing 3 that connects the fuel injection portion 2 and the fuel connector portion 1, and the annular flange portion 4 A fuel injection valve J having a positioning projection 6 formed on the upper side toward the upper side;
An injection valve insertion hole 13 that opens toward the fuel flow path 11 formed in the fuel boss 15, a guide hole 12 that opens continuously from the injection valve insertion hole 13, and
A fuel distribution pipe D provided with a guide groove 19 formed in the outer periphery of the guide hole 12 and opening toward the lower end 12a of the guide hole 12, and a locking projection 16 formed on the fuel boss 15;
A bifurcated opening 20d formed by bending a spring material into a bifurcated shape and extending in the vertical direction from the lower ends of the pair of vertical portions 20a, 20a to the side,
Semicircular portions 20e and 20e having a diameter smaller than the outer diameter A of the annular flange 4 and the same diameter as or slightly smaller than the outer diameter B of the housing 3 are formed, and the upper ends of the vertical portions 20a and 20a are formed. An elastic locking pin P having a U-shaped locking bent portion 20c formed on the connection base portion 20b formed toward the side;
Composed of
The fuel connector portion 1 of the fuel injection valve J is liquid-tightly inserted into the injection valve insertion hole 13 of the fuel distribution pipe D, and the positioning projection 6 is inserted into the guide groove 19 of the fuel distribution pipe D. The locking bent portion 20c of the locking pin P is locked to the locking projection 16 of the fuel distribution pipe D, and the semicircular portions 20e and 20e are disposed on the outer periphery of the housing 3 so as to face the lower surface 4a of the annular flange 4. A structure for mounting a fuel injection valve to a fuel distribution pipe, characterized by being arranged in an expanded manner.

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