JPH045722Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of an engine intake device.

(Prior art and its problems) Some engine intake devices have an independent intake pipe connected to one side of the engine body that extends away from the one side of the engine body and smoothly curves upward. There is a method that does this (see Utility Model Application Publication No. 165562/1983).

In this type of intake system, the independent intake pipe is
Since it supports heavy objects such as a surge tank and a throttle body attached to the upstream end thereof, it must have sufficient rigidity to prevent vibrations of these heavy objects.

On the other hand, it is of course possible to obtain sufficient rigidity by increasing the wall thickness of the independent intake pipe, but this is not preferable from the viewpoint of weight reduction. From this point of view, it can be said that providing the independent intake pipe with a reinforcing rib portion is a preferable means for achieving both weight reduction and rigidity improvement of the independent intake pipe. And, by making this reinforcing rib part as small as possible,
Needless to say, it is desirable to effectively improve the rigidity.

Therefore, the purpose of this invention is to improve the rigidity of the independent intake pipe by providing a reinforcing rib part in the independent intake pipe, and to improve the rigidity of the engine with a small reinforcing rib part. The purpose is to provide an intake device for

(Means and operations for solving the problems) As seen in the above-mentioned Japanese Utility Model Application Publication No. 59-165562, the present invention is of the type in which fuel is supplied to the engine using a fuel injection valve. Focusing on the fact that this fuel injection valve acts as a beam for the independent intake pipe, the reinforcing rib part provided on the independent intake pipe and the fuel injection valve work together to increase the rigidity of the independent intake pipe. This is what I did.

Specifically, we assume an engine intake system in which an independent intake pipe connected to one side of the engine body has a shape that extends away from the one side of the engine body and smoothly curves upward. a boss portion formed inside the curved shape of the independent intake pipe and supporting a fuel delivery pipe that supplies fuel to the fuel injection valve; a boss portion formed inside the curved shape of the independent intake pipe and attached to the axis of the independent intake pipe; A reinforcing rib portion extending along the
The reinforcing rib part is configured such that its downstream end is continuous with the boss part and extends from the upstream end of the independent intake pipe to the boss part.

(Example) In FIGS. 1 and 2, E is an engine body, and the engine body E is an in-line four-cylinder type in which four cylinders 1 to 4 are arranged in series. The intake system for this engine body E is located at the cylinder head 5.
Connecting, in order from the side, an independent intake pipe 7 forming an independent intake passage 6, a surge tank 9 forming an intake expansion chamber 8 in the intake passage, a throttle body 10 with a built-in throttle valve (not shown), etc. The independent intake pipe 7 is composed of:
The downstream end thereof is connected to one side surface 5a of the engine body E, more specifically, one side surface 5a of the cylinder head 5, and the independent intake passage 6 connected to each cylinder 1 to 4 extends in a direction away from the one side surface of the engine body E. The shape curves smoothly upward and is inverted approximately 180 degrees, making the intake system more compact. In this embodiment, the independent intake pipe 7 is divided in the middle, and the upstream independent intake pipe 11 and the downstream independent intake pipe 12 are connected. This is similar to the case where the independent intake pipe 11 and the downstream independent intake pipe 12 are integrally formed, so in the following description, unless otherwise specified, both 11 and 12 will be collectively referred to as the independent intake pipe 7.

One end of the engine body E of the independent intake pipe 7,
Independent intake pipe 7 located on the other end side, that is, independent intake pipe 7 connected to No. 1 cylinder 1 and No. 4 cylinder 4
A boss portion 13 is formed on the curved inner side 7a of the engine, and a fuel delivery pipe 14 arranged in parallel with the engine body E is attached to the boss portion 13. A fuel injection valve 15 is installed. That is,
A nozzle mounting hole 16 is formed at the downstream end of each independent intake pipe 7, and the fuel injector 15 is fixed by the nozzle mounting hole 16 and the fuel delivery pipe 14 (first (see figure). Here, the boss portion 13 is located between the adjacent fuel injection valves 15, that is, between the fuel injection valves 15 of the first cylinder 1 and the second cylinder 2, and between the fuel injection valves 15 of the third cylinder 3 and the fourth cylinder 4. The fuel delivery pipes 14 are disposed between the fuel injection valves 15 and between the fuel injection valves 15, thereby equalizing the pressing force of the fuel delivery pipe 14 against each fuel injection valve 15.

Each independent intake pipe 7 also has a curved inner side 7a.
Inner ribs 20 are provided along the axis, while outer ribs 21 are provided on the outer side 7b. Of these ribs 20 and 21, the inner rib 20 will be explained in detail.
0, its upstream end is continuous with the surge tank 9, while its downstream end extends to the middle of the downstream independent intake pipe 12. In the independent intake pipe 7 where the boss portion 13 is provided,
The downstream end 20a of the inner rib 20 is the boss portion 13
It is made to be continuous.

With such a configuration, the boss portion 13
In the case of the independent intake pipe 11 provided with this, a reinforcing structure is formed by the inner rib 20, the boss portion 13, the fuel delivery pipe 14, and the fuel injection valve 15. For this reason, for example, the inner rib 20 is smaller than the one in which the inner rib 20 is extended to the downstream end of the independent intake pipe 11.
A setting of 0 makes it possible to obtain a higher stiffness improvement effect.

FIG. 3 shows a second embodiment of the present invention. Elements that are the same as those in the first embodiment are designated by the same reference numerals and their explanations will be omitted, and the features of this embodiment will be explained below. Add.

In this embodiment, in the joint flange portion 30 between the downstream independent intake pipe 12 and the upstream independent intake pipe 11, the arrangement of the fastening bolt holes 31 is determined by a virtual line l connecting adjacent fastening bolt holes 31 in each intake passage 6. The layout is such that it passes through the center O of port 3. With such a layout, the surface pressure around the port 32 is equalized, so that sealing performance can be improved.

(Effect of the invention) As is clear from the above explanation, according to the invention, there is no need to extend the reinforcing rib part to the downstream end of the independent intake pipe, and the reinforcing rib part cooperates with the fuel injection valve. Since the rigidity of the independent intake pipe is increased, the rigidity of the independent intake pipe can be more effectively improved while reducing the weight by shortening the reinforcing rib portion.

[Brief explanation of the drawing]

FIG. 1 is a side view of the first embodiment, FIG. 2 is a front view of the downstream independent intake pipe in the first embodiment, and FIG. 3 is a front view of the downstream independent intake pipe in the second embodiment. E...Engine body, 5...Cylinder head,
5a...One side, 7...Independent intake pipe, 11...Upstream independent intake pipe, 12...Downstream independent intake pipe, 1
3...Boss part, 14...Fuel delivery pipe, 15...Fuel injection valve, 16...Nozzle mounting hole,
20... Inner rib, 20a... Downstream end.

Claims (1)

[Claims for Utility Model Registration] In an engine intake system in which an independent intake pipe connected to one side of the engine body is shaped so as to extend away from the one side of the engine body and smoothly curve upward. , a boss formed inside the curved shape of the independent intake pipe and supporting a fuel delivery pipe that supplies fuel to the fuel injection valve; a boss part formed inside the curved shape of the independent intake pipe and aligned with the axis of the independent intake pipe. and a reinforcing rib portion extending along the boss portion, the reinforcing rib portion having a downstream end continuous with the boss portion and extending from the upstream end of the independent intake pipe to the boss portion. An engine intake device characterized by: