JPS6237956Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake manifold for a fuel injection type engine.

In fuel-injected engines, in order to improve engine output and fuel atomization performance, it is necessary to increase the length of the intake pipe, and the required length must also be ensured in the intake manifold for multi-cylinder engines. There must be. However, if the structure of the intake manifold is complicated in order to ensure its length, the installation work to the engine becomes troublesome, and the installation work efficiency is degraded.

The present invention was developed in view of such circumstances, and is an intake manifold for fuel injection type engines that secures a predetermined intake passage length, simplifies the structure, and improves the efficiency of installation into the engine. The purpose is to provide

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, an intake manifold Mi configured according to the present invention is connected to a multi-cylinder, for example, four-cylinder engine main body E, which further includes: A throttle body and an air cleaner (not shown) are connected. At the end of the intake manifold Mi closer to the engine body E, there is a
Four fuel injection valves V are attached corresponding to the four intake ports (not shown), and each fuel injection valve V injects fuel into the intake port according to the cycle of the corresponding cylinder. .

Referring to FIGS. 2 and 3 together, the intake manifold Mi consists of an expander 1 to which the throttle body is connected, and a branch body 2 that connects the engine body E and the expander 1.

The branch body 2 includes four branch pipes 3a, 3b, 3c, and 3d corresponding to the number of cylinders of the engine body E,
Two branch pipes 3a to 3d are integrated near the dilator 1. That is, branch pipes 3a and 3b
are integrated, and the branch pipes 3c and 3d are integrated. The branch body 2 consisting of four branch pipes 3a to 3d has a flat part 4 and a rising part 5 as a whole.
It consists of The flat portion 4 extends substantially horizontally in a direction away from the engine body E by a length sufficient to exhibit an intake pipe effect, and has a flange 6 at one end on the engine body E side for connection to the engine body E. is provided in common to each of the branch pipes 3a to 3d. The rising portion 5 curves upward and rises from the other end of the flat portion 4, and a flat mounting surface 7 for connecting to the dilator 1 is formed at its upper end.

At one end of the branch body 2 near the engine main body E, a fuel injection valve V is disposed above each of the branch pipes 3a to 3d.
A cylindrical portion 8 into which the cylindrical portions are inserted is integrally provided with its axis inclined from the horizontal plane. The four fuel injection valves V, each of which has its tip inserted into each cylindrical portion 8, are commonly connected to a single fuel supply header 9. This fuel supply header 9 connects each branch pipe 3a to
They are each supported by a support part 10 that is integrally provided on the upper part of the frame 3d. A regulator valve Vr is connected to the fuel supply header 9, and the function of this regulator valve Vr keeps the fuel discharge pressure from each fuel injection valve V constant.

A flange 6 at one end of the branch body 2 is provided so as to be inclined toward the engine main body E as it goes upward, and a total of seven bolt holes 11a to 11g are bored in this flange 6. That is, two bolt holes 11a and 11b are drilled corresponding to the branch pipe 3a, and three bolt holes are drilled corresponding to the two branch pipes 3b and 3c.
Two bolt holes 11c to 11e are drilled, and two bolt holes 11f and 11e are drilled corresponding to the remaining branch pipe 3d.
1g is drilled. These bolt holes 11a-1
1g, the remaining bolt holes other than the central bolt hole 11d are arranged symmetrically with respect to a vertical plane containing the axis of the central bolt hole 11d. That is, the bolt holes 11a and 11g on both sides are at the same height, and the four bolt holes 11b and 11 near the center are at the same height.
c, 11e, and 11f are at the same height position. Furthermore, the axes of the bolt holes 11a to 11g are inclined upward as they move away from the engine body E, and are parallel to each other.

Each of the bolt holes 11a to 11g is arranged so that its axial extension line does not come into contact with the branch body 2 from the engine body E to the rising portion 5. That is, if the axial extension lines of each bolt hole 11a to 11g are shown, they will be shown by the chain lines in FIGS. 2 and 3, where the chain line L1 is the bolt hole 11d, and the chain line L2 is the bolt hole 11b, 11c, 11e, 11f. , chain line L
3 indicates the axial extension lines of the bolt holes 11a and 11g, respectively. As is clear from FIGS. 2 and 3, each of the chain lines L1 to L3 does not come into contact with the branch body 2 from the engine body E to the rising portion 5.

The mounting surface 7 provided at the other end of the branch body 2 has a
Openings 12a to 12d are provided for each branch pipe 3a to 3d, so that when the dilator 1 is attached to the mounting surface 7, each branch pipe 3a to 3d is opened to the dilator 1.
Commonly communicated within. In the mounting surface 7, a plurality of screw holes 13, for example, five screw holes, are formed in the peripheral edge of the mounting surface 7 and extend vertically.
When attaching the dilator 1, bolts 14 passing through corresponding portions of the dilator 1 are screwed together.

The expander 1 extends from the mounting surface 7 toward the engine body E side, and the branch body 2 has two central branch pipes 3b and 3c to support the lower part of the extended part.
A support stand 15 is integrally provided throughout.

Next, to explain the operation of this embodiment, when attaching the intake manifold Mi to the engine body E, first, the flange 6 of the branch body 2 is arranged correspondingly to the flange surface of the engine body E, and each bolt hole 11a is ~Insert the bolt into 11d and tighten.
At this time, the axes of each of the bolt holes 11a to 11d are inclined upward as they move away from the engine body E and are parallel to each other, and the extended line of each axis does not come into contact with the branch body 2 until it reaches the rising portion 5. Therefore, a dedicated tightening jig is inserted between the rising portion 5 and the flange 6, and a plurality of bolts can be inserted into each of the bolt holes 11a to 11d and tightened using the tightening jig. . As a result, the work of attaching the branch body 2 to the engine body E can be carried out extremely efficiently.

After completing the installation work of the branch body 2 to the engine body E, the expander 1 is attached to the branch body 2. For this installation, insert each bolt 14 into the bolt hole (not shown) of the expander 1 from above. It is only necessary to insert it into the mounting surface 7 and screw it into each screw hole 13 of the mounting surface 7. Since the fastening work is done from above, it is easy to perform the work. Therefore, the efficiency of attaching the dilator 1 to the branch body 2 is also improved.

As described above, according to the present invention, the intake manifold consists of a branch body having a plurality of branch pipes, and an expander connected to the branch body so that each branch pipe communicates in common, and the branch body is connected to the engine body. Since it has a flat part that extends almost horizontally in a direction away from the flat part, and a rising part that curves upward and rises from the flat part, the overall structure is extremely simple and has a sufficient length to exert the intake pipe effect. A long path length can be obtained. Moreover, a flange having a plurality of bolt holes for attachment to the engine body is integrally provided at one end of the flat part on the engine body side, and each bolt hole has an axial extension line extending from the engine body. The shafts are arranged so as to avoid contact with the flat part from the to the rising part, and are bored in the flange so as to be inclined parallel to each other so that each axis extension line moves upward as it moves away from the engine body. This makes it possible to insert a special jig for bolt fastening between the flange and the rising part and tighten multiple bolts at once to install the branch body to the engine body, improving installation work performance. do. Furthermore, a flat mounting surface for attaching the dilator is provided at the upper end of the rising portion, and a bolt hole extending vertically is drilled in the mounting surface for screwing the dilator connecting bolt. Therefore, when connecting the dilator to the branch body, the bolt can be inserted and tightened from above the dilator, making the installation work easier, and this also improves the efficiency of the installation work.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a plan view of the branch body in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2. . 1... Ampulla, 2... Branched body, 3a-3d...
Branch pipe, 4... flat section, 5... rising section, 6...
Flange, 7... Mounting surface, 11a to 11g... Bolt hole, 13... Screw hole, 14... Bolt.

Claims (1)

[Scope of utility model registration request] It consists of a branch body having a plurality of branch pipes communicating with each intake port of the multi-cylinder engine body, and an expander connected to the branch body so that each branch pipe communicates in common, and the branch body is connected to the engine body. It has a flat part that extends almost horizontally in a direction away from the flat part, and a rising part that curves upward from the flat part, and one end of the flat part on the side of the engine body is connected to the engine body. A flange having a plurality of bolt holes for mounting is integrally provided, and each bolt hole is arranged so that its axial extension line does not come into contact with the flat part between the engine body and the rising part. At the same time, each axial extension line is inclined parallel to each other upward as it moves away from the engine body, and is bored in the flange, and at the upper end of the rising part is a flat plate for attaching the expander. 1. An intake manifold for a fuel injection engine, characterized in that the mounting surface is provided with a plurality of vertically extending screw holes for screwing an expander connecting bolt into the mounting surface.