JP5674381B2 - Internal combustion engine - Google Patents

Description

The present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine of the injector for supplying injection into each cylinder fuel consisting attached to air intake manifold.

In modern internal combustion engine, the injection supply of fuel to each cylinder, and carried out by injecting the air intake port by the Lee Njekuta, in this case, the injector disposed in each of said cylinders, each of The fuel is distributed through a fuel delivery pipe connected to the .

And as patent document 1 as a prior art,
"A i Njekuta and fuel delivery pipe, the upper surface side portion of the intake pipes of the intake manifold which is joined with the flange portion on the side surface of the cylinder head, inclined obliquely downward toward the injector to the flange portion The nozzle at the tip of the injector is inserted and inserted into an injector mounting hole formed in the flange of the intake manifold so that the nozzle is inserted into the intake port to the cylinder. In this state, the fuel delivery pipe is fixedly supported by being connected to the flange portion via a bracket member.
It has been described configuration that.

JP 2000-073910 A

  However, when the fuel delivery pipe is connected and supported to the flange portion of the intake manifold via a bracket member as in Patent Document 1, the intake manifold is attached to the injector and the fuel delivery pipe. This requires a bracket member to be connected to the flange portion, so that not only the number of parts is increased by the amount of the bracket member, but also the weight is increased, and the bracket is installed in the vertical direction of the fuel delivery pipe. In order to suppress the vibration of the bracket member, it is necessary to have a structure having high rigidity, which causes a problem that the bracket member is further increased in size and weight.

The present invention, these problems, the without causing damage to the nozzle portion or the like of the tip during installation of the injector, and a technical object and Turkey solve.

In order to achieve this technical problem, the invention of claim 1
“A cylinder head having an intake port open on one side, an intake manifold fixed to one side of the cylinder head, and an injector for injecting fuel into the intake port of the cylinder head,
The intake manifold includes an intake pipe that communicates with the intake port, and the intake pipe is formed with a flange portion that overlaps one side surface of the cylinder head. , While providing an injector mounting hole into which the nozzle portion of the injector fits,
The injector is disposed in a slanting downward posture that approaches the axial center of the intake port toward the tip and is connected to a fuel delivery pipe. A mounting piece provided on the fuel delivery pipe is attached to the intake manifold. The boss part provided on the intake pipe is overlaid from the opposite side of the cylinder head and fixed with bolts,
A positioning portion is provided on the intake pipe of the intake manifold, on which the mounting piece of the fuel delivery pipe is placed before the fuel delivery pipe is fixed and the tip of the injector is inserted into the injector mounting hole. The angle of inclination of the injector with respect to the intake port in a state in which is mounted on the positioning portion is set to be smaller than the angle of inclination of the injector with respect to the intake port in a state where the mounting piece is fixed to the boss portion, The mounting piece is separated from the positioning part with the mounting piece fixed to the boss. ",
It is configured as follows.
The invention of claim 2 is the invention of claim 1,
“The intake pipe is composed of an upper half and a lower half. Flange pieces that overlap each other are formed on the upper half and the lower half, and these are welded together. The positioning part protrudes upward on the half flange piece. ''
It is configured as follows.

In this configuration, in the installation of the injectors, firstly, the nozzle portion at the tip of the front Symbol injector, at the same time as the write-free insert the injector mounting hole in the intake manifold, the attachment pieces of the fuel delivery pipe, the upper surface of the positioning portion in the intake pipe Ru put on.

Accordingly, the inclination oblique angle of the Injector, can be maintained in a state close to (inclination angle in the fixed state) predetermined tilt angle.

In this case, when said positioning portion is not provided, the injector is thereby own weight and the weight of the fuel delivery pipe or the like, so that the inclination oblique angle away larger than the inclination angle of the Jo Tokoro strikes the inner surface and the inner surface of the intake port of the nozzle portion harm Njekuta mounting hole at the tip, in the middle of insertion insertion of the nozzle portion, or damage the nozzle portion and the seal ring, or damage the injector mounting hole There is a high risk of doing so.

In the present invention are contrast, prior SL from the Roh nozzle portion held in a state close to inclined oblique angle Tokoro inclination angle of the constant of the injector can be inserted inserted into the injector mounting hole, plug insertion of the nozzle portion During this process, the possibility of damaging the nozzle part and the seal ring or damaging the injector mounting hole can be greatly reduced.

Then, the mounting piece of the fuel delivery pipe to overlap the mounting boss portion of the air intake manifold, in this state, by fastening by bolt the mounting piece before Symbol boss for mounting the Injector is It is held to a Jo Tokoro angle of inclination and Jo Tokoro of insertion depth.

In this attached state, the mounting piece of the fuel delivery pipe from a state away from the positioning portion of the intake pipe, the positioning portion can be prevented from being adversely affected to the inclination angle and the insertion depth of the previous SL injector.

In other words, according to the present invention, since the injector and the fuel delivery pipe can be securely attached to the intake manifold without using a bracket member as in Patent Document 1, the number of parts and the weight can be reduced. In addition, the attachment can be made safe by reducing damage to the nozzle portion at the tip of the injector and damage to the injector mounting hole. As a result, the work efficiency can be improved and the cost can be reduced.
If the structure of Claim 2 is employ | adopted, since the flange piece in an upper half part is reinforced by the positioning part, joining to the upper half part and lower half part in an intake pipe can be strengthened more.

It is a top view which shows embodiment of this invention. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a figure which shows the state in the middle of attachment. It is a figure which shows the state which manufactures the intake pipe of an intake manifold.

  Embodiments of the present invention will be described below with reference to FIGS.

  In these drawings, reference numeral 1 denotes an internal combustion engine comprising a plurality of cylinders 2 arranged along a crank axis 1 ′.

Inside the cylinder head 3 of the internal combustion engine 1, an intake port 4 to each cylinder 2 is provided so as to open with respect to one longitudinal side surface (one side surface) 5 of the cylinder head 3.

On one side surface 5 of the cylinder head 3, an intake manifold 6 for distributing intake air from an air cleaner (not shown) to each cylinder is provided with a flange portion 7 provided integrally with the intake manifold 6 by a plurality of bolts 7a. It is joined by fastening . The intake manifold 6 is made of heat-resistant synthetic resin of the hard substance, and includes a plurality of intake pipes 8 which communicates with each of the intake port 4.

  In the present embodiment, each intake pipe 8 in the intake manifold 6 employs the manufacturing method described below.

That is, as shown in FIG. 3 and FIG. 5, the intake pipe 8 is divided into an upper half 8 'and a lower half 8 "and molded separately, and then both of these are formed in the upper half 8' . After the flange pieces 8a 'and 8b' provided integrally on the left and right sides and the flange pieces 8a "and 8b" provided integrally on the left and right sides of the lower half 8 " are aligned to each other, flange members 8a ', 8b ", 8a" , the 8b "and pinched at vibrator a, B, a method in which one body of by the thermally welded by applying ultrasonic vibration.

In the case of this embodiment, the spacing of the intake pipe 8 next to each other, as shown in FIG. 1, the same wide and spacing of the cylinder 2 at locations of the flange portion 7 for bonding, with distance from the flange portion 7 It is configured to be narrow.

  Next, in FIGS. 1 to 5, reference numeral 9 denotes an injector disposed on the upper surface side of each intake pipe 8 in the intake manifold 6, and reference numeral 10 denotes an injector on the upper surface side of each intake pipe 8. Each shows a fuel delivery pipe made of heat-resistant synthetic resin arranged so as to cross.

As shown in FIG. 2, each of the injectors 9 moves the axis 9 ′ of the injector 9 closer to the axis 4 ′ of the intake port 4 as it goes to the tip as viewed from the direction of the crank axis 1 ′. and to the axis 4 'of the intake port 4 is inclined at a predetermined inclination angle θ which is obliquely Me downward, and the nozzle portion 9a at its distal end, the injector mounting hole 11 which is disposed on the flange portion 7 is inserted, the nozzle portion 9a is Nde wherein each within Nino intake port 4. Hand, the inlet portion 9b of the other end is connected to the front Symbol fuel delivery pipe 10.

In the portion of the intake manifold 6 between the intake pipes 8, injector mounting boss portions 12 are integrally provided so as to connect the adjacent intake pipes 8 to each other. of 12, the side surface on the opposite side of the flange portion 7 of the intake manifold 6, and forming a mounting surface 12a which is perpendicular to the axis 9 'of the injector 9, the bolt hole 12b is, the injector from the mounting surface 12a 9 so as to extend parallel to the axis 9 ' .

On the other hand, a portion of the fuel delivery pipe 10 corresponding to the mounting boss portion 12 is integrally provided with a mounting piece 13 that overlaps the mounting surface 12a of the mounting boss portion 12. the mounting boss portion 12 are hand fastened to the bolt 14.

Further, a positioning portion 15 for the mounting piece 13 is provided integrally with a portion of the intake manifold 8 below the mounting piece 13 in the intake manifold 6, and the positioning portion 15 is provided with the mounting piece 13. before the step of fixing the mounting boss portion 12, in case inclined oblique angle of the injector 9 is closer to the predetermined inclination angle theta predetermined angle one Heck smaller than theta, said to mounting piece 13 rests on the upper surface Is set to

Accordingly, the attachment piece 13 of the fuel delivery pipe 10 is fixed to the mounting bosses 12, when the injector 9 has a predetermined inclination angle theta, as shown in FIGS. 2 and 3, the attachment piece 13 and the positioning The structure is such that it is lifted (separated) by an appropriate distance H away from the portion 15.

  In the case of the present embodiment, the positioning portion 15 is formed in a rib shape integrally provided so as to extend along one flange piece 8a ′ of the intake pipe piece 8 ′ in the upper half of the intake pipe 8. This rib-shaped positioning portion 15 reinforces the one flange piece 8a ', so that the upper half intake pipe piece 8' and the lower half intake pipe piece 8 "of the intake pipe 8 are connected to each other. Bonding by ultrasonic vibration can be made stronger.

In this configuration, when installing the injectors 9, first, each injector 9 and its fuel delivery pipe 10 are combined so that the fuel delivery pipe 10 is connected to the inlet end 9b of the injector 9, and this combined state is maintained. Figure 4 as shown in the nozzle portion 9a at the tip of the injector 9, simultaneously with the write-free insert the injector mounting hole 11 in the intake manifold 6, the attachment piece 13 of the fuel delivery pipe 10, the positioning unit 15 in the intake pipe 8 Ru placed on the top surface.

Accordingly, since it is possible to hold the state close to the inclination angle theta of the inclination angle theta 'to Jo Tokoro of the injector 9, in this state, inserting insert the nozzle portion 9a of the injector 9 to the injector mounting hole 11 As a result, the possibility of damaging the nozzle portion 9a and the seal ring or damaging the injector mounting hole 11 during the insertion of the nozzle portion 9a can be greatly reduced.

Then, the by fastening the attaching bosses 12 preparative mounting piece 13 of the fuel delivery pipe 10 at bolt 14, while holding the injector 9 of Jo Tokoro inclination angle theta, and, the injector 9 Roh nozzle portion 9a is held in a predetermined insertion depth.

In this attached state, since the mounting piece 13 of the fuel delivery pipe 10 is lifted away from the positioning portion 15 of the intake pipe 8, the positioning unit 15 is an effect on the inclination angle θ and insertion depth before Symbol injector 9 There is no effect.

2 cylinder 3 cylinder head 4 intake port 4 'intake port axis 6 intake manifold 7 flange 8 intake pipe 9 injector 9' injector axis 10 fuel delivery pipe 11 injector mounting hole 12 injector mounting boss 12a mounting surface 13 mounting Piece 14 bolt 15 positioning part

Claims (2)

A cylinder head having an intake port open on one side, an intake manifold fixed to one side of the cylinder head, and an injector for injecting fuel into the intake port of the cylinder head;
The intake manifold includes an intake pipe that communicates with the intake port, and the intake pipe is formed with a flange portion that overlaps one side surface of the cylinder head. , While providing an injector mounting hole into which the nozzle portion of the injector fits,
The injector is disposed in a slanting downward posture that approaches the axial center of the intake port toward the tip and is connected to a fuel delivery pipe. A mounting piece provided on the fuel delivery pipe is attached to the intake manifold. The boss part provided on the intake pipe is overlaid from the opposite side of the cylinder head and fixed with bolts,
A positioning portion is provided on the intake pipe of the intake manifold, on which the mounting piece of the fuel delivery pipe is placed before the fuel delivery pipe is fixed and the tip of the injector is inserted into the injector mounting hole. The angle of inclination of the injector with respect to the intake port in a state in which is mounted on the positioning portion is set to be smaller than the angle of inclination of the injector with respect to the intake port in a state where the mounting piece is fixed to the boss portion, The mounting piece is separated from the positioning part with the mounting piece fixed to the boss.
Internal combustion institutions. The intake pipe is composed of an upper half and a lower half. Flange pieces that overlap each other are formed on the upper half and the lower half and are welded to each other. The positioning part protrudes upward from the flange piece of the part,
The internal combustion engine according to claim 1.

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