JP2002070689A - Delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the shape of a part while suppressing a moment having a head mounting part as a fulcrum in a pressure rise within an injector mounting part. SOLUTION: This delivery pipe A comprises a main passage 11 provided on a first part 10, and the injector mounting part 21 and head mounting part 11 serially arranged on a second part 20, the first part 10 being combined with the second part 20 in parallel. Since the three means of the main passage 11, the injector mounting part 21, and the head mounting part 22 are provided dispersively to the first part 10 and the second part 20, the shape of each part can be simplified. Since the injector mounting part 21 and the head mounting part 22 are serially arranged, the moment having the head mounting part 22 as fulcrum in the pressure rise within the injector mounting part 21 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delivery pipe for distributing fuel to a plurality of injectors in an internal combustion engine.

[0002]

2. Description of the Related Art In an internal combustion engine having a plurality of cylinders, FIGS. 9 and 10 show a means for distributing fuel pressure-fed from one fuel supply pipe to injectors provided individually for each cylinder. Such a delivery pipe 100 is used. The delivery pipe 100 includes a linear main path 101 connected to a fuel supply pipe (not shown), and a plurality of holes that branch off from the main path 101 and form holes arranged in parallel along the main path 101. Injector mounting part 1
02 and a plurality of head mounting portions 104 formed in a through-hole shape for allowing the bolt 103 to pass therethrough and arranged in parallel along the main path 101. Head mounting part 10
4 is screwed into the female screw hole 106 of the engine head 105, the delivery pipe 100 is fixed to the engine head 105. In this fixed state, the injector 107 attached to the injector mounting portion 102
Comes into the injector fixing portion 108 of the engine head 105.

[0003]

In the conventional delivery pipe 100, the main path 101, the injector mounting portion 1
Although the three holes of the head 02 and the head mounting portion 104 are formed in a single part, the formation of the three holes in one part complicates the shape of the part itself. Therefore, for example, when the delivery pipe is formed by die molding, there is a possibility that the positional relationship between the three holes may be restricted, and the degree of freedom in design is low.

[0004] In addition, the axis 1 of the injector mounting portion 102
When the position 02a and the axis 104a of the head mounting portion 104 are offset from each other, the pressure in the injector mounting portion 102 rises, and a force in the direction of lifting from the injector 107 acts on the injector mounting portion 102. At this time, a moment about the head mounting portion 104 acts on the delivery pipe 100, and the delivery pipe 100 is deformed or the injector mounting portion 10 is deformed.
Since there is a possibility that the sealing performance may be degraded due to the biasing load applied to the seal member 109 in the inside 2, it is necessary to consider these circumstances when designing.

The present invention has been made in view of the above circumstances, and has as its object to simplify the shape of components while suppressing a moment about the head mounting portion when the pressure in the injector mounting portion rises.

[0006]

According to a first aspect of the present invention, there is provided a main path connected to a fuel supply path, and a plurality of injector mounting portions branched from the main path and arranged in parallel along the main path. And a head mounting portion having a hole shape through which a bolt passes and having an axis parallel to the axis of the injector mounting portion, and fixed by screwing a bolt passed through the head mounting portion to an engine head. In a delivery pipe in which the injector attached to the injector attachment portion faces the inside of the engine head when the injector is fixed to the engine head, the main path is provided in the first part, and An injector mounting portion and the head mounting portion are provided in a second component in series and provided with the first component and the second component.
The parts and the parts are combined in parallel.

According to a second aspect of the present invention, in the first aspect of the invention, in the second part, the injector mounting portion and the head mounting portion are formed so that their axes are parallel to each other, and the head mounting portion is formed. The axis of the section and the axis of the injector mounting section are arranged in a straight line. According to a third aspect of the present invention, in the first or second aspect, a positioning means for positioning the first component and the second component is provided.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the positioning means has a pipe shape for communicating the main path and the injector mounting portion.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, both the first component and the second component are:
The structure was made of a stainless steel drawn material or a stainless steel extruded material.

[0009]

According to the first aspect of the present invention, since the three means of the main path, the injector mounting portion, and the head mounting portion are provided separately in the first component and the second component, the shape of each component is reduced. Simplification can be achieved. Further, since the injector mounting portion and the head mounting portion are arranged in series, it is possible to suppress a moment about the head mounting portion as a fulcrum when the pressure in the injector mounting portion rises.

[0010] Since the axis of the head mounting portion and the axis of the injector mounting portion are arranged so as to be aligned in a straight line, a force in the direction of lifting the injector mounting portion in the axial direction from the injector. Even if it acts, no moment is generated about the fulcrum of the fixed portion of the head mounting portion to the engine head. [Invention of Claim 3] Since the main path of the first component and the injector mounting portion of the second component are accurately positioned, the communicating portion between the main path and the injector mounting portion does not shift.

[0011] Since the positioning means also serves as a means for communicating the main path and the injector mounting portion, the positioning means and the communication means are provided as independent independent single function means. In comparison, it is possible to simplify the component shape or reduce the number of components. [Invention of claim 5] In the case of a delivery pipe made of a die-cast material of an aluminum alloy, it is difficult to secure a strength to withstand a pressure of 20 MPa or more acting on the main passage and the injector mounting portion. Then, since both the first component provided with the main path and the second component provided with the injector mounting portion are made of a drawn or extruded material of stainless steel, they are sufficient to withstand a high pressure of 20 MPa or more. It has strong strength.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. The delivery pipe A of the present embodiment includes a first component 10,
It comprises a second component 20 and a bellows member 30. The first part 10 and the second part 20 are made of any of a stainless steel drawn material, a stainless steel extruded material, and a stainless steel hot forged material. Each of the first component 10 and the second component 20 has an elongated shape in the left-right direction as a whole.
In the present embodiment, the vertical direction and the horizontal direction are based on FIG. 1, and the left and right directions in FIG.

The first part 10 has a rectangular tube shape with a substantially rectangular cross section, and its axis extends in a straight line. First part 10
Is a main path 11 connected to a fuel supply path (not shown). The first component 10 is provided with a port (not shown) for connecting a fuel supply pipe to the main path 11. A plurality of circular communication holes 12 are formed in the rear wall of the first component 10 at a predetermined pitch in parallel with the axial direction of the main path 11.

The second component 20 has a solid rod shape with a substantially rectangular cross section, and its length and height are the same as the length and height of the first component 10. The second component 20 has a plurality of injector mounting portions 21 for mounting the injector 25 and a plurality of head mounting portions 22 for mounting the delivery pipe A to the engine head 40.

[0015] The injector mounting portion 21 is provided with the second component 20.
The hole is formed in a circular cross-section by drilling upward from the lower end surface side, and the straight axis thereof is oriented in the vertical direction.
Note that the injector mounting portion 21 does not penetrate the upper surface of the second component 20. The plurality of injector mounting portions 21 are arranged in parallel with the length direction of the second component 20 in parallel with their axes 21a oriented parallel to each other. In other words, the axes 21a of the plurality of injector mounting portions 21 are , Are arranged on a straight line in the longitudinal direction of the second component 20.

The second component 20 has a circular communication hole 23 extending from the front surface thereof into the injector mounting portion 21. The communication holes 23 are formed so as to correspond to the respective communication holes 12 of the first component 10 so that the height and the position in the left-right direction coincide with each other.
And the communication hole 23 of the second component 20 have the same diameter. A metal pipe 1 is inserted into these communication holes 12 and 23.
5 (positioning means, which is a component of the present invention), is fitted. When the first component 10 and the second component 20 are combined, the main path 11 and the injector mounting portion 21 are connected by the pipe 15. Communicate with each other.
The material of the pipe 15 includes the first component 10 and the second component.
The same material as the component 20 can be used.

An injector 25 is attached to each injector mounting portion 21 via a bellows member 30 fixed to the injector mounting portion 21. The bellows member 30 is made of a metal material that can be flexibly deformed. The upper end of the bellows member 30 is a cylindrical fixing part 31 having a constant diameter in the direction of the axis 30a of the bellows member 30, and the fixing part 31 is fixed to the injector mounting part 21 by welding or other means. Thus, the bellows member 30 is fixed coaxially with the injector mounting portion 21 so as to hang down from the injector mounting portion 21.

Below the fixing portion 31 of the bellows member 30, there is an expansion / contraction deformation in the direction of the axis 30a (vertical direction) and a deformation in which the axis 30a is bent or bent in the front / rear and left / right directions crossing the axis 30a. A possible bellows 32 is formed. Further, below the bellows portion 32, there is formed a cylindrical portion 33 having a constant diameter in the direction of the axis 30a (a restricting means which is a component of the present invention). Below the cylindrical portion 33, a tightly folded flange portion 34 is formed to project toward the outer peripheral side. Tubular part 33
And the inner peripheral portion of the flange portion 34, which is continuous with the cylindrical portion 33, abuts on a regulating member 28 of the injector 25 described later in the direction of the axis 30a from above. Further, below the flange portion 34, a cylindrical mounting portion 35 having a diameter smaller than the flange portion 34 but larger than the cylindrical portion 33 and having a constant diameter in the axial direction is formed. I have.
The lower end of the cylindrical mounting portion 35 is a tapered portion 36 that spreads downward.

The injector 25 has an elongated shape as a whole, and has an upper end serving as a fuel suction portion 26 and a lower end serving as a fuel discharge nozzle 27. An annular regulating member 2 is provided at the upper end of the injector 25.
8 (restriction means which is a constituent element of the present invention) is fitted so as to cover from above. A receiving portion 29 is formed on the regulating member 28 by making the outer peripheral surface of the regulating member 28 step-shaped so that the upper side has a smaller diameter than the lower side. The outer diameter of the regulating member 28 above the receiving portion 29 is substantially the same as the inner diameter of the cylindrical portion 33 of the bellows member 30, and the outer diameter of the regulating member 28 below the receiving portion 29 is the bellows member. The dimensions are substantially the same as the inner diameter of the cylindrical mounting portion 35 of the thirty.

The head mounting portion 22 is formed in a circular cross section by drilling so as to penetrate between the upper and lower end surfaces of the second component 20, and the straight axis 22 a has a vertical direction (the axis of the injector mounting portion 21). 21a (direction parallel to 21a). A bolt 24 is rotatably inserted into the head mounting portion 22 from above. The plurality of head mounting portions 22 are arranged in parallel with the length direction of the second component 20 with the axes 22a oriented parallel to each other, similarly to the injector mounting portion 21. The axes 22a of the plurality of head mounting portions 22 are arranged on a straight line in the length direction of the second component 20, and the parallel direction line 22b of the axis 22a of the head mounting portion 22 is viewed from above (the axis When viewed in a direction parallel to 22a), the parallel direction line 21b of the axis 21a of the injector mounting portion 21
Matches. That is, the axis 22 of the plurality of head mounting portions 22
a and the axes 21a of the plurality of injector mounting portions 21 are all arranged on one straight line. In other words, when viewed from above, the injector mounting portion 21 and the head mounting portion 22 are arranged in series.

On the upper surface of the engine head 40, a plurality of injector fixing portions 4 each having a hole shape for fitting a lower end portion (discharge nozzle 27) of the injector 25 without play.
1 is recessed in an arrangement corresponding to each injector mounting portion 21. Similarly, a plurality of female screw holes 42 are formed in the engine head 40 so as to align with the openings at the lower ends of the head mounting portions 22. Next, the operation of the present embodiment will be described. When manufacturing the delivery pipe A, the pipe 15 is inserted into one of the communication holes 12 or 23 of the first component 10 and the second component 20 and, in that state, the pipe 15 is inserted into the communication hole 23 or 12 of the other component. And the two components 10 and 20 are united in parallel such that the rear surface of the first component 10 and the front surface of the second component 20 are in close contact with each other. Then, in this combined state, the two parts 10 and 20 are connected in a non-removable state by brazing, and the gap between the communication holes 12 and 23 and the pipe 15 is set to a sealed state. The bellows member 30 is fixed to the injector mounting portion 21 of the second component 20 in a sealed state by welding or the like before or after the first component 10 and the second component 20 are combined.

When the two parts 10 and 20 are combined, the main path 11 and each injector mounting portion 21 are in communication with each other through the hollow of the pipe 15, and the fuel supplied into the main path 11 passes through each pipe 15. Injector mounting part 21
Is distributed within. The inner diameter of the pipe 15 is an orifice having a sufficiently small diameter as compared with the inner diameter of each of the main path 11 and the injector mounting portion 21. Also, the parallel direction lines 21b of the axes 21a, 22a of the injector mounting portion 21 and the head mounting portion 22,
Reference numeral 22b denotes an arrangement rearwardly offset from the main path 11.

When the delivery pipe A manufactured as described above is mounted on the engine head 40, the injector 25 is first fitted into the injector fixing portion 41 in a play-restricted state. The delivery pipe A is brought close to the engine head 40 from above so as to position the cylindrical mounting portion 35 and the head mounting portion 22 in the injector fixing portion 41 and the female screw hole 42, respectively. It is fitted into the shape mounting portion 35. Next, when the bolt 24 is inserted into each head mounting portion 22 and screwed into the female screw hole 42, the delivery pipe A is fixed to the engine head 40. In the fixed state,
The seal ring 16 seals between the inner peripheral surface in the cylindrical mounting portion 35 and the outer peripheral surface of the injector, thereby preventing leakage of fuel.

In the bellows member 30, a cylindrical portion 33 and a flange portion 34 provided below the bellows portion 32 are formed over the entire periphery with respect to the receiving portion 29 of the regulating member 28 fitted to the injector 25. When the bellows portion 32 is excessively extended and deformed in the axial direction, the excessively extending in the axial direction is received by the injector 25 via the regulating member 28. It has become. In the present embodiment, the three means of the main path 11, the injector mounting portion 21, and the head mounting portion 22 are combined with the first component 1.
0 and the second component 20, each component 1
The shapes of 0 and 20 can be simplified. And
The simplification of the shape makes it possible to reduce design constraints when designing the arrangement of the main path 11, the injector mounting portion 21, the head mounting portion 22, and the like.

Further, since the main path 11 of the first component 10 and the injector mounting portion 21 of the second component 20 are accurately positioned by the pipe 15, the communicating portion between the main path 11 and the injector mounting portion 21 is shifted. There is no. Moreover, since the pipe 15 serving as the positioning means also serves as a means for communicating the main path 11 with the injector mounting portion 21, the positioning means and the communication means are provided as a single function means independent of each other. In addition, simplification of the part shape or reduction of the number of parts can be achieved.

The axial center 21a of the injector mounting portion 21 of the delivery pipe A and the axial center 4 of the injector fixing portion 41 of the engine head 40 depend on the difference in thermal expansion coefficient.
Even if a positional deviation occurs with respect to 1a, the positional deviation can be absorbed by the displacement of the bellows member 30. Therefore, there is no possibility that an eccentric load acts on the seal ring 16 in the cylindrical mounting portion 35 due to the positional shift, thereby deteriorating the sealing performance.

Further, even if a pulsating flow accompanying the opening and closing of the discharge valve 27 of the injector 25 occurs in the injector mounting portion 21, the pulsating flow is attenuated by the elastic deformation of the bellows member 30, and the main path 1
Transmission to one side is suppressed, and as a result, abnormal noise due to pulsation is suppressed. In other words, since the rigidity of the main path and that of the bellows member 30 are different from each other, the resonance points are different, thereby suppressing the transmission of pulsation. Further, as a means for restricting excessive stretching deformation of the bellows member 30 in the axial direction, the extension load of the bellows member 30 is received by the injector 25 via the regulating member 28, so that the bellows member itself expands due to its rigidity. As compared with the means for regulating the expansion, the regulation of the elongation and deformation is more reliable. Moreover, since the cylindrical portion 33 of the bellows member 30 abuts on the regulating member 28 of the injector 25 over the entire circumference, there is no possibility that the cylindrical portion 33 of the bellows member 30 is displaced so as to tilt the axis.

When the fuel supply pressure in the delivery pipe A rises to a large value of 20 MPa or more, the bellows member 3
The pressure is reduced by deforming the zero bellows portion 32. Further, even if the injector mounting portion 21 attempts to float upward in the axial direction with respect to the injector 25 due to the pressure, the axes 22a of the plurality of head mounting portions 22 and the axes 21a of the plurality of injector mounting portions 21 are directly aligned. Since they are arranged side by side on the line, no moment is generated with the fulcrum at the fixed portion of the head mounting portion 22 to the engine head 40. Therefore, the delivery pipe A may be deformed due to the moment, or the injector mounting portion 2 may be deformed.
There is no such a problem that the biasing load is applied to the seal ring 16 in the seal ring 1 to deteriorate the sealing performance.

In a case where the head mounting portion is provided directly below the main path and the axis of the head mounting portion intersects with the axis of the main path, a bolt is passed through the head mounting portion or a bolt is screwed. However, in the present embodiment, since the head mounting portion 22 is offset rearward with respect to the main route 11, the bolt 24 penetrates the head mounting portion 22 and the engine of the bolt 24 is disengaged. At the time of screwing work to the head 40, there is no possibility of interference with the main path 11, and workability is excellent.

Further, since the pipe 15 has an orifice shape whose diameter is smaller than that of the main path 11 and the injector mounting portion 21, it is possible to reduce the pulsation caused by the injection noise of the injector 25 and the opening and closing of the discharge nozzle of the injector 25. Can be. Further, a high pressure of 10 to 20 MPa acts on the main passage 11 and the injector mounting portion 21. However, in the case of a delivery pipe made of an aluminum alloy die-cast material, it is not possible to secure a strength that can withstand a pressure of 20 MPa or more. Although difficult, the delivery pipe A of the present embodiment is made of a drawn material, an extruded material, or a hot forged material of stainless steel, and therefore has sufficient strength to withstand a pressure of 20 MPa or more.

[Other Embodiments] The present invention is not limited to the embodiment described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) In the above embodiment, the axis of the head mounting portion and the axis of the injector mounting portion in the second component are arranged in a straight line, but according to the present invention, the axis parallel line of the head mounting portion and the injector mounting portion are aligned. The axial parallel lines of the section may be offset from each other.

(2) In the above embodiment, the first component and the second component are positioned by the positioning means. However, according to the present invention, a configuration may be adopted in which no positioning means is particularly provided. (3) In the above embodiment, the positioning means is a pipe-shaped positioning member fitted to the first component and the second component so as to pass between them. However, according to the present invention,
The positioning means may be configured to fit a convex portion formed on one of the first component and the second component into a concave portion formed on the other component. In this case, a through hole may be formed in the convex portion and the concave portion so that the main path communicates with the injector mounting portion.

(4) In the above embodiment, the positioning member serving as the positioning means is also used as a means for communicating the main path and the injector mounting portion. However, according to the present invention, the positioning means and the communicating means are united with each other. The function may be independent. (5) In the above embodiment, the first component and the second component are fixed by brazing. However, according to the present invention, the communication holes 12 and 2 are fixed.
As long as the sealability between 3 and the pipe 15 can be ensured,
The two parts may be fixed by other coupling means such as bolting. (6) In the above embodiment, the case where the injector is indirectly attached to the injector mounting portion via the bellows member has been described. However, the present invention is also applicable to a structure in which the injector is directly mounted on the injector mounting portion without providing the bellows member. Can be applied.

[Brief description of the drawings]

FIG. 1 is a front view of a state in which a delivery pipe is attached to an engine head according to a first embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is a front view of a delivery pipe.

FIG. 5 is a plan view of a delivery pipe.

FIG. 6 is a sectional view

FIG. 7 is a sectional view

FIG. 8 is a sectional view of the disassembled state.

FIG. 9 is a plan view of a conventional example.

FIG. 10 is a sectional view of a conventional example.

[Explanation of symbols]

 A: Delivery pipe 10: First part 11: Main path 15: Pipe (positioning means) 20: Second part 21: Injector mounting part 21a: Axis line of injector mounting part 22: Head mounting part 22a: Axis line of head mounting part 24 ... bolts 25 ... injectors 40 ... engine head

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02F 1/24 F02F 1/24 J F02M 37/00 321 F02M 37/00 321B (72) Inventor Takao Kimura Aichi 10 Hamada-shi, Nakahata-machi, Nishio-shi, Japan (72) Inventor Eiji Isogai 10 Hamada-shita, Nakahata-cho, Nishio-shi, Aichi Prefecture Inside otics, Inc. Bottom 10 Inside OTICS Co., Ltd. (72) Inventor Jun Hattori 10 Bottom Hamada, Nakahata-cho, Nishio-shi, Aichi F-term (reference) 3G024 AA04 FA01 FA02 3G066 AA02 AB02 AD05 BA22 BA56 BA65 CB05 CD04 CD10 CD15

Claims (5)

[Claims] 1. A main path connected to a fuel supply path, a plurality of injector mounting portions branched from the main path and arranged in parallel along the main path, and a hole through which a bolt penetrates. A head mounting part whose axis is parallel to the axis of the injector mounting part, and the engine head is fixed by screwing a bolt passed through the head mounting part to the engine head. In the delivery pipe in which the injector attached to the injector attachment portion faces the inside of the engine head, the main path is provided in the first component, and the injector attachment portion and the head attachment portion are connected to each other. The first part and the second part are arranged in parallel in two parts, and the first part and the second part are combined in parallel. Delivery pipe to be. 2. In the second part, the injector mounting portion and the head mounting portion are formed so that their axes are parallel to each other, and the axis of the head mounting portion and the axis of the injector mounting portion are aligned. 2. The delivery pipe according to claim 1, wherein the delivery pipes are arranged so as to be arranged in a straight line. 3. The delivery pipe according to claim 1, further comprising positioning means for positioning the first component and the second component. 4. The delivery pipe according to claim 3, wherein the positioning means has a pipe shape for communicating the main path with the injector mounting portion. 5. The method according to claim 1, wherein both the first component and the second component are:
The delivery pipe according to any one of claims 1 to 4, wherein the delivery pipe is made of a drawn material of stainless steel or an extruded material of stainless steel.