JP2000220552A - Fuel injection valve mounting device in fuel injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve mounting device assuring maintenance work for fuel distribution pipes with ease. SOLUTION: This mounting device comprises the longitudinal axis A-A of an intake pipe A, the longitudinal axis R-R of the holder insertion hole 12 of a fuel distribution pipe R, and the longitudinal axis H-H of a holder member H arranged in the same straight line X-X. The tip cylinder 4 of a fuel injection valve J is arranged in a fuel injection valve tip insertion hole 2, and the longitudinal axis J-J is arranged along the straight line X-X, and the rear end 6 is arranged facing to the inside of the holder insertion hole 12 of the fuel distribution pipe R. The holder member H is detachably arranged in the holder insertion hole 12 of the fuel injection pipe R, and the end cylinder 5 of the fuel injection valve J is supported by the fuel injection valve rear end insertion hole 19 of the holder member H projected from the face 11 opposing to the intake pipe of the fuel distribution pipe R, and the tip cylinder 4 is supported by the fuel injection valve tip insertion hole 2 of an intake pipe A. The fuel in the fuel flowing passage 9 of the fuel distribution pipe R is supplied in a fuel introduction passage 17 through a tapered section 14 and moves toward the inside of the fuel injection valve J.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump in which fuel pressurized by a fuel pump is supplied to a fuel distribution pipe, and the fuel in the fuel distribution pipe is injected and supplied to an intake passage of an intake pipe via a fuel injection valve. In particular, the present invention relates to a fuel injection valve mounting device in which a fuel injection valve is disposed between an intake pipe and a fuel distribution pipe.

[0002]

2. Description of the Related Art An apparatus for mounting a fuel injection valve in a conventional fuel injection device is disclosed in Japanese Patent Publication No. 4-78877. According to this, a fuel flow path is formed in the fuel distribution pipe along the longitudinal direction, a fuel inflow joint is connected to one end of the fuel flow path, and a pressure regulator or a pulsation damper is connected to the other end. Is connected.
That is, the opening in the longitudinal direction of the fuel flow path is closed by the member. In addition, a fuel injection valve rear end insertion hole is formed in the fuel distribution pipe at right angles to the fuel flow path, and a fuel injection valve rear end cylindrical portion is inserted and supported in the fuel injection valve rear end insertion hole. Is done. Thus, the fuel supplied to the fuel flow path is supplied from the fuel injection valve rear end insertion hole toward the fuel injection valve.

[0003]

According to such a conventional fuel injector mounting apparatus, the maintenance of the fuel distribution pipe cannot be improved. That is, when cleaning the fuel distribution path of the fuel distribution pipe, the fuel inflow joint and the pressure regulator that close both ends of the fuel distribution path are removed, and even if the fuel inflow path is opened linearly and the air is blown, the fuel injection valve is closed. It is difficult to satisfactorily remove foreign matter from the rear end insertion hole of the fuel injection valve whose rear end is inserted and supported. Further, in the above, air having a high pressure acts on the fuel opening at the rear end of the fuel injection valve, and when foreign matter in the fuel distribution path is mixed into the air, the foreign matter enters the fuel opening at the rear end. There is a risk of entry, which is not desirable. Further, the fuel injection valve can be removed from the fuel injection valve rear end insertion hole by removing the fuel distribution pipe from the intake pipe and the engine. According to this, the rear end insertion hole of the fuel injection valve can be held in an open state, so that the fuel distribution path and the rear end insertion hole of the fuel injection valve can be easily cleaned. In particular, at the time of the fuel distribution pipe mounting work, after securely inserting the rear end cylinders of all the fuel injection valves into the fuel injection valve rear end insertion holes,
It is necessary to attach the fuel distribution pipe to the intake pipe and the engine, and the maintenance performance is poor in those having a plurality of fuel injection valves.

[0004] A fuel injection valve mounting device in a fuel injection device according to the present invention has been made in view of the above-mentioned problems, and is capable of reliably and easily cleaning a fuel distribution pipe. The main purpose is to provide a mounting device.

[0005]

According to the present invention, there is provided a fuel injection valve mounting device in a fuel injection device, wherein the fuel injection valve is provided at a tip end of the fuel injection valve which is bored from an outer end into an intake passage to achieve the above object. An intake pipe having an insertion hole, a fuel flow passage formed in a longitudinal direction, a fuel flow passage extending along the fuel flow passage, and a holder insertion penetrating from the holder insertion end toward the intake pipe facing end. A fuel distribution pipe having a hole, a tubular part inserted into a holder insertion hole of the fuel distribution pipe, a reduced diameter part in the middle of the cylinder part facing the fuel flow path, and a reduced diameter part inside thereof. A fuel introduction passage connected to the fuel flow path through the portion, and a holder member including a fuel injection valve rear end insertion hole that is connected to the fuel introduction passage at the upstream and opens to the lower end at the downstream. The longitudinal axis of the fuel injection valve tip insertion hole in the pipe and the fuel distribution pipe The longitudinal axis of the holder insertion hole and the longitudinal axis of the holder member are arranged on the same straight line, and the tip cylinder of the fuel injection valve is supported by the fuel injection valve tip insertion hole of the intake pipe, and its longitudinal The axial line is arranged along a straight line, the rear end cylinder of the fuel injection valve is arranged facing the holder insertion hole of the fuel distribution pipe, and the holder member is inserted into the holder insertion hole from the holder insertion end of the fuel distribution pipe. By detachably fixing the fuel injection valve toward the rear end, the rear end cylindrical portion of the fuel injection valve is supported by the fuel injection valve rear end insertion hole of the holder member, and the fuel injection valve is sandwiched between the holder member and the intake pipe, A first feature is that the fuel flow path of the fuel distribution pipe is connected to the fuel introduction path via the reduced diameter portion of the holder member.

According to the present invention, in addition to the first feature, a filter is provided at a reduced diameter portion of the holder member for removing foreign matter in fuel flowing from a fuel flow path toward a fuel introduction path. This is the second feature.

Further, according to the present invention, in addition to the first and second features, a first elastic ring is disposed between an outer periphery of a holder member located above the fuel flow path and a holder insertion hole. A second elastic ring is disposed between the outer periphery of the holder member located below the fuel flow path and the holder insertion hole, and the second elastic ring is provided between the fuel injection valve rear end insertion hole of the holder member and the fuel injection valve rear end cylinder. A third feature is that a third elastic ring is disposed therebetween.

[0008]

According to the first feature of the present invention, by removing the holder member from the holder insertion hole of the fuel distribution pipe,
The fuel distribution passage can be opened to the holder insertion end and the end facing the intake pipe through the holder insertion hole, whereby the fuel distribution passage can be cleaned well. Also, the holder member can be cleaned with the holder member removed.

Further, according to the second feature of the present invention, since the filter is arranged at the reduced diameter portion of the holder member, the degree of freedom of arrangement of the filter can be increased and the filter can be reliably cleaned. it can.

Further, according to a third feature of the present invention, the first
The pressurized fuel in the fuel flow path is not leaked to the outside of the fuel distribution pipe by the elastic ring and the second elastic ring,
Further, the fuel flowing through the fuel introduction path is not leaked outside the fuel distribution pipe by the third elastic ring.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel injection valve mounting device in a fuel injection device according to the present invention will be described below. A
Is an intake pipe, and a downstream portion on the left side in FIG. 1 is connected to an engine (not shown). At the outer end 1 of the intake pipe A, a fuel injection valve tip insertion hole 2 is bored downward and toward the inside of the intake passage 3 of the intake pipe A. The opening to the end 1 is a packing insertion hole 22 having a large diameter.
Open with A fuel injection valve J has a front end tubular portion 4 formed below and a rear end tubular portion 5 having a rear end 6 formed above the fuel injection valve. A portion 7 is formed, and a lower locking flange 8 is formed above the distal end cylindrical portion 4. The first fuel injection valve J is a known fuel injection valve. R is a fuel distribution pipe in which a fuel flow path 9 is bored along the longitudinal axis direction, and fuel pressurized by a fuel pump not shown is supplied to the fuel flow path.
A holder insertion hole 12 penetrates from the holder insertion end 10 at the upper right of the fuel distribution pipe R to the intake pipe opposing end 11 at the lower left. Crosses the fuel flow path 9. In addition, 16
Reference numeral 50 denotes a first locking step provided at an opening of the holder insertion hole 12 to the holder insertion end 10, and 50 denotes a holder insertion end 1.
0 is a female screw hole. H is a holder member, the outer diameter of which is a holder insertion hole 12 for the fuel distribution pipe R.
A cylindrical portion 13, an intermediate reduced-diameter portion 14, and an upper flange portion 15 are formed therein. The introduction path 17 is connected to the fuel introduction path 17 at the upper side and at the lower end 1 at the lower side.
A fuel injection valve rear end insertion hole 19 that opens to 8 is continuously provided.
Reference numeral 20 denotes a second elastic ring 21 made of an elastic material fitted to the cylindrical portion 13 below the reduced diameter portion 14.
The first elastic ring is made of an elastic material and fitted to the upper cylindrical portion 13. The configuration of the fuel injection device has been described above.

The mounting of the fuel injection valve J is performed as follows. The longitudinal axis AA of the fuel injection valve tip insertion hole 2 of the intake pipe A, the longitudinal axis RR of the holder insertion hole 12 of the fuel distribution pipe R, and the longitudinal axis HH of the holder member H are They are arranged on the same straight line XX.

[0013] The distal end cylindrical portion 4 of the fuel injection valve J is inserted into the fuel injection valve distal end insertion hole 2. At this time, the lower locking flange 8 including the distal end cylindrical portion 4 is disposed in the packing insertion hole 22. Is locked by a packing 30 made of a rubber material. On the other hand, a cushion ring 31 made of a rubber material is locked on the upper locking flange 7 including the rear end tubular portion 5. As mentioned above,
The fuel injection valve J is such that its front end cylindrical portion 4 is inserted into and supported by the fuel injection valve front end insertion hole 2 of the intake pipe A. At this time, the longitudinal axis JJ of the fuel injection valve J is a straight line X It is substantially arranged on -X. In such a state, the fuel distribution pipe R
Attachment means F such as a stay is fixed to the intake pipe A or another engine part at a position shown in the figure, and at this time, a part of the rear end cylinder portion 5 including the rear end 6 of the fuel injection valve J is It is arranged facing the inside of the holder insertion hole 12 of the fuel distribution pipe R. The above state is shown in FIG.

The fuel injection device in the state shown in FIG. 1 is finally assembled to the intake pipe A as follows. FIG.
More specifically, the holder member H is inserted into the holder insertion hole 12 of the fuel distribution pipe R which is positioned and fixed, and the pressing plate 33 screwed above the upper flange 15 onto the holder insertion end 10. Press to fix. According to the above description, the upper flange 15 of the holder member H is fixed to the locking step 1.
6, the reduced diameter portion 14 is located in the holder insertion hole 12 and facing the fuel flow path 9, and
Is inserted through the holder insertion hole 12, and the lower end 18 protrudes downward from the suction pipe facing end 11 of the fuel distribution pipe R. Then, at this time, the lower end 18 of the holder member H contacts the cushion ring 31 of the fuel injection valve J and presses the cushion ring 31. On the other hand, the rear end cylindrical portion 5 including the rear end 6 of the fuel injection valve J is inserted into the fuel injection valve rear end insertion hole 19 of the holder member H.

According to the above description, the fuel injection valve J has the front end cylindrical portion 4 through the packing 30 and the fuel injection valve front end insertion hole 2.
The rear end cylindrical portion 5 is stored and supported in the rear end insertion hole 19 of the fuel injection valve of the holder member H, so that the fuel injection valve J is moved along the straight line XX along the intake passage 3 of the intake pipe A. Can be placed inside. Further, the fuel injection valve J is elastically sandwiched between the intake pipe A and the fuel distribution pipe R via the packing 30 and the cushion ring 31, and the relative position between the fuel distribution pipe R and the intake pipe A is slightly different. Even if it is misaligned, it can be securely attached.

When the pressurized fuel is supplied into the fuel passage 9 of the fuel distribution pipe R, the fuel is supplied to the fuel injection valve J via the reduced diameter portion 14 of the holder member H and the fuel introduction passage 17. Then, the fuel controlled by the fuel injection valve J is injected and supplied into the intake passage 3 of the intake pipe A. In such a case, the first elastic ring 21 and the second elastic ring 20 suppress fuel leakage from the holder insertion hole 12 of the fuel distribution pipe R, and are fitted to the rear end tubular portion 5 of the fuel injection valve J. The third elastic ring 34 made of an elastic material suppresses fuel leakage from the fuel introduction path 17 of the holder member H.

According to the fuel injector mounting device,
The maintenance of the fuel distribution pipe is performed as follows.
That is, the pressing plate 33 screwed onto the holder insertion end 10 of the fuel distribution pipe R is removed, and then the holder member H is pulled out along the straight line XX. According to the above description, the holder insertion hole 12 drilled in the fuel distribution pipe R has an upper end opened to the holder insertion end 10 and a lower end formed at the intake pipe facing end 11.
Open to Therefore, if air is blown toward the holder insertion hole 12, foreign matter in the fuel distribution passage 9 and the holder insertion hole 12 is removed by the holder insertion end 10 and the intake pipe facing end 11.
It is discharged to the outside through the holder insertion hole 12 opening at the bottom.
At this time, since the holder insertion hole 12 is opened in a straight line, the discharging property of the foreign matter can be enhanced.

The rear end cylinder 5 of the fuel injection valve J is disposed facing the inside of the holder insertion hole 12 of the fuel distribution pipe R. The rear end cylinder 5 of the fuel injection valve J is Since the fuel injection valve J is inserted into the rear end insertion hole 19, an annular gap S is formed between the rear end cylinder portion 5 of the fuel injection valve J and the holder insertion hole 12 of the fuel distribution pipe R. Thus, even when air acts toward the rear end 6 of the fuel injection valve J when cleaning the holder insertion hole 12 including the fuel flow path 9, the air is discharged to the outside through the annular gap S. Therefore, the ratio of foreign matter directly colliding with the fuel passage opening to the rear end 6 of the fuel injection valve J is reduced.

The holder member H is pulled out from the fuel distribution pipe R, so that the periphery thereof is reliably opened to the atmosphere. Therefore, the cleaning is performed reliably and easily without any hindrance.

Next, considering the assembly of the fuel distribution pipe R after the maintenance work, the holder member H is inserted into the holder insertion hole 9 from the holder insertion end 10 of the fuel distribution pipe R. Since the rear end cylindrical portion 5 of the fuel injection valve J is arranged to enter the holder insertion hole 12 in advance, the rear end cylindrical portion 5 of the fuel injection valve J is not greatly inclined. Accordingly, the fuel injection valve rear end insertion hole 19 of the holder member H can be easily inserted into the fuel injection valve J rear end cylindrical portion 5, and
Maintenance work can be performed favorably.

If the cylindrical filter 40 is disposed on the reduced diameter portion 14 of the holder member H, foreign matter flowing from the fuel flow path 9 toward the fuel introduction path 17 of the holder member H can be reliably removed. it can. Further, by disposing the filter member 40 on the reduced diameter portion 14, the degree of freedom of arrangement of the filter 40 is high, and the optimum design of the filter 40 can be easily performed. As in the prior art, in the case where the filter 40 is mounted on the rear end cylinder portion 5 of the fuel injection valve J, the filter is arranged in a narrow portion, and the degree of freedom in designing the filter 40 is low. Also, during the maintenance work, the filter 40 is most susceptible to foreign matters and needs to be carefully cleaned. However, in the case where the filter 40 is disposed in the reduced diameter portion 14 as in the present invention, the filter Since the periphery of 40 is completely open to the atmosphere, cleaning can be performed very easily and reliably.

Further, the holder insertion hole 12 and the upper cylindrical portion 1 are formed.
3 is held by the first elastic ring 21, so that the fuel flowing through the fuel flow path 9 from the holder insertion end 10 does not leak. Since the seal between the holder insertion hole 12 and the lower cylindrical portion 13 is held by the second elastic ring 20, the fuel flowing through the fuel flow path 9 from the intake pipe facing end 11 does not leak. Furthermore, since the seal between the rear end cylindrical portion 5 of the fuel injection valve J and the fuel injection valve rear end insertion hole 19 of the holder member H is held by the third elastic ring 34,
The fuel flowing through the fuel introduction path 17 from the lower end 18 of the holder member H does not leak.

[0023]

As described above, according to the first aspect of the present invention, by taking out only the holder member without removing the fuel distribution pipe, the fuel distribution pipe can be reliably and easily maintained. . In addition, all the holder members can be opened to the atmosphere by taking out the holder members, so that reliable cleaning can be performed. Also, when the holder member is inserted into the holder insertion hole after the maintenance work, the rear end cylindrical portion of the fuel injection valve is inserted into the holder insertion hole of the fuel distribution pipe, so that the inclination of the fuel injection valve is reduced. Is restrained within a certain range, whereby the assemblability of the holder member can be kept good.

Further, by disposing the filter on the reduced diameter portion of the holder member, the degree of freedom in designing the filter can be increased and the maintainability of the filter can be improved.

Further, a first elastic ring is disposed between the outer periphery of the holder member located above the fuel passage and the holder insertion hole, and the outer periphery of the holder member located below the fuel passage and the holder. The second elastic ring is disposed between the insertion hole and the third elastic ring between the rear end insertion hole of the fuel injection valve of the holder member and the rear end cylindrical portion of the fuel injection valve. Sealing between the fuel injection pipe and the fuel distribution pipe and between the fuel injection valve and the holder member can be reliably performed, and fuel leakage from these portions can be completely suppressed.

[Brief description of the drawings]

FIG. 1 is an arrangement diagram showing a state in which components constituting a fuel injection device are arranged on a straight line XX.

FIG. 2 is a longitudinal sectional view of a main part showing a state where the fuel injection device is assembled.

[Explanation of symbols]

 2 Fuel injection valve tip insertion hole A Intake pipe 9 Fuel flow path 10 Holder insertion end 11 Intake pipe facing end 12 Holder insertion hole 17 Fuel introduction path 19 Fuel injection valve rear end insertion hole R Fuel distribution pipe H Holder member 40 Filter J Fuel Injection valve

Claims (3)

[Claims] 1. An intake pipe A having a fuel injection valve tip insertion hole 2 drilled from an outer end 1 into an intake passage 3. A fuel passage 9 is drilled along a longitudinal direction. A holder insertion hole 12 which is provided continuously across the fuel flow path 9 and penetrates from the holder insertion end 10 toward the intake pipe facing end 11.
A fuel distribution pipe R provided with: a cylindrical portion 13 inserted into the holder insertion hole 12 of the fuel distribution pipe R; a reduced diameter portion 14 located at an intermediate portion of the cylindrical portion 13 and facing the fuel flow path 9; A fuel introduction passage 17 which is inward and communicates with the fuel flow passage 9 through the reduced diameter portion 14, and an upstream end thereof is connected to the fuel introduction passage 17, and a downstream end of the fuel injection valve is opened toward the lower end 18. Hole 1
9 and the suction pipe A
A longitudinal axis A-A of the fuel injection valve tip insertion hole 2 and a longitudinal axis R-R of the holder insertion hole 12 of the fuel distribution pipe R;
Align the longitudinal axis HH of the holder member H with a straight line XX
The fuel injection valve J is disposed at the upper end thereof, the distal end cylindrical portion 4 of the fuel injection valve J is supported by the fuel injection valve distal end insertion hole 2 of the intake pipe A, and its longitudinal axis JJ is disposed along a straight line XX, Further, the rear end cylindrical portion 5 of the fuel injection valve J is inserted into the holder insertion hole 12 of the fuel distribution pipe R.
And the holder member H is removably fixedly arranged from the holder insertion end 10 of the fuel distribution pipe R toward the holder insertion hole 12, whereby the rear end insertion hole 19 of the fuel injection valve of the holder member H is provided. At the rear end cylinder 5 of the fuel injection valve J
And the fuel injection valve J was sandwiched between the holder member H and the intake pipe A, and the fuel flow path 9 of the fuel distribution pipe R was connected to the fuel introduction path 17 via the reduced diameter portion 14 of the holder member H. An installation device for a fuel injection valve in a fuel injection device. 2. A filter 40 for removing foreign matter in fuel flowing from the fuel flow passage 9 toward the fuel introduction passage 17 is provided in the reduced diameter portion 14 of the holder member.
A mounting device for a fuel injection valve in the fuel injection device as described in the above. 3. A first space between the outer periphery of the holder member H above the fuel flow path 9 and the holder insertion hole 12.
The second elastic ring 20 is disposed between the holder insertion hole 12 and the outer periphery of the holder member H at a position below the fuel flow path 9 where the elastic ring 21 is disposed, and the rear end of the fuel injection valve of the holder member H. 3. The fuel injection valve mounting device according to claim 1, wherein a third elastic ring is disposed between the insertion hole and the rear end cylindrical portion of the fuel injection valve.