JP3553783B2 - Intake manifold - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intake manifold applied to an internal combustion engine for an automobile.
[0002]
[Prior art]
Conventionally, in a fuel injection type multi-cylinder engine in which a crankshaft is positioned parallel to an axle in an automobile, a collision occurs between an intake manifold mounted on the engine and a so-called dash panel behind the engine room. In order to reduce the influence on the engine in the event of the above, the engine is arranged so as to form an extra space called a crash stroke. As this type of intake manifold, for example, as in Japanese Unexamined Utility Model Publication No. Sho 63-92069, branch pipes for respective cylinders are formed in a substantially horizontal J-shape, and the respective branch pipes are formed at the upper end thereof. An arrangement in which a communicating surge tank is provided is known. In such an engine, a delivery pipe for supplying fuel to the fuel injection valve is arranged in a space inside the intake manifold. A connector (coupler) for electric wiring of the fuel injection valve is located above the fuel injection valve.
[0003]
[Problems to be solved by the invention]
In recent years, in order to improve the safety of occupant protection, there has been an increasing demand for increasing the distance of the extra space. In order to respond to such a demand, in the intake manifold where the branch pipe has a C-shape, if the branch pipe is deformed so as to be closer to the engine side in order to increase the distance of the spare space, the spare space becomes Although enlarged, the fuel injection valve comes into contact with the branch pipe, so that it becomes necessary to tilt the fuel injection valve closer to the engine.
[0004]
Generally, the connector for electrical connection of the fuel injection valve is provided on the upper portion of the fuel control valve in consideration of the easiness of the connection work, so that when the fuel control valve is tilted as described above, the connector Sometimes came too close to the engine, making it impossible to secure the space required for connection between the connector and the engine. Alternatively, even when secured, in order of its wide space is insufficient, the cable attachment and detachment work of the connectors was sometimes difficult.
[0005]
An object of the present invention is to solve such a problem.
[0006]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve such an object. That is, the intake manifold according to the present invention has a configuration in which the branch pipes located inside are unevenly and coarsely arranged, and surrounds the delivery pipe over substantially the entire length in the lateral direction of the internal combustion engine.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention provides a multi-cylinder internal combustion engine in which a connector for inputting a control signal protrudes from a lower surface side and a fuel injection valve to which fuel is supplied via a delivery pipe is attached to a cylinder head corresponding to each cylinder. An intake manifold having a plurality of branch pipes formed to be curved below a surge tank and mounted at a position where a delivery pipe is positioned between the engine and a multi-cylinder internal combustion engine, the intake manifold being located at both ends. An intake manifold characterized in that the branch pipes between the branch pipes are unevenly and coarsely arranged downward from the surge tank , and the delivery pipe is surrounded over substantially the entire length in the lateral direction of the multi-cylinder internal combustion engine. is there.
[0008]
According to such a configuration, a gap is formed between the branch pipes because the branch pipes are unevenly and coarsely arranged. As a result, work such as electric wiring of the fuel injection valve can be performed through the gap. Further, since the internal combustion engine surrounds the entire length of the delivery pipe, the internal combustion engine is mounted on the vehicle sideways so that its crankshaft is substantially parallel to the axle. Each branch pipe protects the delivery pipe, thereby making it possible to prevent damage to the delivery pipe.
[0009]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The engine 2 to which the intake manifold 1 of the present invention is mounted is a fuel injection type four-cylinder engine, and is provided with a fuel injection valve 3 corresponding to each cylinder. The engine 2 is mounted on the vehicle sideways so that its crankshaft is substantially parallel to the axle. In such a horizontally mounted engine 2, the intake manifold 1 is opposed to the dash panel 4 at the back of the engine room.
[0010]
The fuel injection valve 3 of this embodiment is attached to the intake port 2b of the cylinder head 2a so as to be able to inject fuel, and is connected to a delivery pipe 5 disposed in a space surrounded by the intake manifold 1 and the cylinder head 2a. They are in communication. The delivery pipe 5 itself is a normal one, and has a pressure regulator 5a at one end thereof and a return pipe 5b communicating with the pressure regulator 5a.
[0011]
On the other hand, these fuel injection valves 3 are provided with a connector 3a for inputting a control signal protruding from the lower surface so that the connection direction is substantially horizontal. This is because the depth of the intake manifold 1 is made smaller than usual in order to increase the crash stroke CS between the intake manifold 1 and the dash panel 4, and the space for mounting the fuel injection valve 3 is reduced. caused by. Specifically, as shown in FIG. 2, since the angle α between the injection axis of the fuel injection valve 3 and the center axis of the cylinder, that is, the mounting angle with respect to the cylinder head 2a is smaller than that of the related art, The connector 3a is disposed on the lower surface side because a sufficient space for disposing the connector 3a cannot be obtained between the upper surface 3 and the cylinder head 2a. As a result, the cable can be connected with good workability by utilizing the space below the fuel injection valve 3.
[0012]
The intake manifold 1 is made of, for example, casting, and is provided with four branch pipes 11, 12, 13, and 14 having a substantially J-shape in side view, which are not vertically divided, a surge tank 15, and a flange 16, which are integrally formed. On the upper side, the flange 16 is fixed to the cylinder head 2a of the engine 2. For this reason, the distance L between the mounting surface of the flange 16 and the surface on the flange 16 side of each of the branch pipes 11, 12, 13, 14 is shorter than that of the conventional one. On the other hand, this intake manifold 1 has a structure in which branch pipes 12 and 13 located on the inside are roughly arranged to form a space for electrical connection work therebetween, as described later. The dimension between the outer surfaces of the branch pipes 11 and 14 at both ends is longer than that of the conventional one, and is set to be substantially the same as the length dimension of the delivery pipe 5.
[0013]
Specifically, each of the branch pipes 11, 12, 13, and 14 has a substantially elliptical cross-sectional shape whose diameter decreases toward the end on the flange 16 side, that is, the lower ends 11b, 12b, 13b, and 14b. It consists of a substantially J-shaped cylinder. The upper ends 11a, 12a, 13a, and 14a are gathered at the lower surface of the surge tank 15 so that the outer surfaces thereof are in contact with each other, and the lower ends 11b, 12b, 13b, and 14b of the flange 16 are arranged at equal intervals corresponding to the respective cylinders. It is a configuration to be separated. That is, the respective branch pipes 11, 12, 13, and 14 are unevenly and coarsely arranged in an intermediate pipe section between the upper ends 11a, 12a, 13a, 14a and the lower ends 11b, 12b, 13b, 14b. Is what is done.
[0014]
Each of the branch pipes 11, 12, 13, and 14 corresponds to a cylinder of the engine 2. In FIG. 2, the right end of the pipe is a first cylinder branch pipe (hereinafter, simply referred to as a first branch pipe). Hereinafter, the same applies to 11). In order to the left end, a second cylinder branch pipe (second branch pipe) 12, a third cylinder branch pipe (third branch pipe) 13, and a fourth cylinder branch pipe (first branch pipe). (Four branch pipes) 14. Further, each of the branch pipes 11, 12, 13, 14 is curved so as not to protrude outward from the same plane as the front wall 15a of the surge tank 15, and when viewed from the side, the surge tank 15 is a generally J-shaped side view, which curves upward along a vertical plane substantially parallel to the front wall 15a. In this embodiment, the first branch pipe 11 and the second branch pipe 12, the third branch pipe 13 and the fourth branch pipe 14 are respectively provided integrally, and the second branch pipe 12 and the third branch pipe 13 are connected to each other. A gap is formed therebetween, and the branch pipes 11, 12, 13, and 14 are unevenly arranged.
[0015]
By separating the second branch pipe 12 and the third branch pipe 13 in this manner, a space used when a cable is connected to the connector 3a of the fuel injection valve 3 is formed. Specifically, the upper ends 12a and 13a of the second branch pipe 12 and the third branch pipe 13 are connected to each other on the lower surface of the surge tank 15 on the outer surface. I have. When viewed from the front, the second branch pipe 12 extends downward while being inclined toward the right side, as shown in FIG. 3, and the distance between the second branch pipe 12 and the third branch pipe 13 in front of the flange 16 is the largest. So that it is curved in the vertical and horizontal directions. On the other hand, when viewed from the front, the third branch pipe 13 descends while inclining toward the left side surface as shown in the figure, and the distance to the second branch pipe 12 is shortest before the flange 16. It is curved so that In other words, the second branch pipe 12 and the third branch pipe 13 are formed so as to be separated from each other as viewed downward from the surge tank 15 when viewed from the front. As a result, the vicinity of the lower surfaces of the second branch pipe 12 and the third branch pipe 13 is in the most separated state, and a working space for connecting a cable to the connector 3a of the fuel injection valve 3 is secured. is there. Accordingly, the first branch pipe 11 is also curved substantially the same as the second branch pipe 12 along the second branch pipe 12, and the fourth branch pipe 14 is also integrated with the third branch pipe 13 in the vertical portion. It is curved in a state where
[0016]
In such a configuration, in the engine 2 in which the fuel injection valve 3 is attached to each cylinder, when the intake manifold 1 is attached to the engine 2, the lower ends 11b, 12b of the respective branch pipes 11, 12, 13, 14 are formed. , 13b, 14b, the fuel injection valve 3 is located. Each of the fuel injection valves 3 is mounted in a state where the cylinder head 2a is positioned vertically and is inclined horizontally from the vertical position. Therefore, the connector 3a of the fuel injection valve 3 faces the front direction, that is, the direction of the intake manifold 1.
[0017]
On the other hand, when viewed from the front, the width dimension of the intake manifold 1 is substantially the same as the length of the delivery pipe 5, so that the intake manifold 1 extends the delivery pipe 5 with respect to the dash panel 4 of the engine room. Will be surrounded. Therefore, the connection of the cable to the connector 3a is performed from the side of the fuel injection valves 31, 34 of the first cylinder and the fourth cylinder. For the remaining fuel injection valves 32 and 33 of the second and third cylinders, cable connection work is performed via a work space between the second branch pipe 12 and the third branch pipe 13. As described above, when viewed from the front of the intake manifold 1, there is a space between the second branch pipe 12 and the third branch pipe 13, and the fuel injection of the second cylinder and the third cylinder is performed from this space. The connectors 3a of the valves 32 and 33 can be confirmed, and the connection operation can be facilitated.
[0018]
When the engine 2 is mounted on the vehicle, the distance L between the flange 16 side surface of each of the branch pipes 11, 12, 13, 14 and the mounting surface of the flange 16 is shortened, so that the engine room dash The distance between the panel 4 and the front surface of each of the branch pipes 11, 12, 13, and 14, that is, the crash stroke CS increases. Therefore, even when the engine 2 moves rearward in the engine room due to an impact, the margin before the intake manifold 1 collides with the dash panel 4 is increased. Therefore, the possibility that the intake manifold 1 is deformed at the time of a vehicle collision can be reduced. As a result, the delivery pipe 5 located between the intake manifold 1 and the engine 2 can be protected over substantially the entire length, the possibility of damaging the delivery pipe 5 can be reduced, and safety can be improved. be able to.
[0019]
Note that the present invention is not limited to the embodiment described above. In the above-described embodiment, the intake manifold 1 mounted on a four-cylinder engine has been described. However, the same configuration can be applied to a three-cylinder engine or a six-cylinder engine. That is, in the case of a three-cylinder engine, a branch pipe for the first cylinder and a branch pipe for the second cylinder, or a branch pipe for the second cylinder and a branch pipe for the third cylinder are spaced apart from each other. What is necessary is just to roughly arrange the branch pipe located in the middle of a branch pipe. Similarly, in the case of the six-cylinder engine, the branch pipes for the second to fifth cylinders located between the branch pipe for the first cylinder and the branch pipe for the sixth cylinder are roughly arranged, Between the branch pipe for the third cylinder and the branch pipe for the fourth cylinder, or between the branch pipe for the first cylinder and the branch pipe for the second cylinder, the branch pipe for the third cylinder and the branch pipe for the fourth cylinder. The space between each of the branch pipe and the branch pipe for the fifth cylinder and the branch pipe for the sixth cylinder may be widened. Even in such an example, the same effect as in the above embodiment can be obtained.
[0020]
In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.
[0021]
【The invention's effect】
As described above, according to the present invention, since the branch pipes are unevenly and coarsely arranged, a gap is formed between the branch pipes, and electric wiring of the fuel injection valve and the like is formed through the gap. Work can be done. Further, since the internal combustion engine surrounds the entire length of the delivery pipe, the internal combustion engine is mounted on the vehicle sideways so that its crankshaft is substantially parallel to the axle. Each branch pipe protects the delivery pipe, thereby preventing damage to the delivery pipe.
[Brief description of the drawings]
FIG. 1 is a schematic structural explanatory view showing an engine equipped with an embodiment of the present invention.
FIG. 2 is a sectional view showing a positional relationship between an intake manifold and a fuel injection valve in the embodiment.
FIG. 3 is a front view of the embodiment.
FIG. 4 is a top view of the embodiment.
FIG. 5 is a side view of the embodiment.
FIG. 6 is a front view showing a positional relationship between an intake manifold and a delivery pipe in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Intake manifold 2 ... Engine 3 ... Fuel injection valve 5 ... Delivery pipe 11 ... First cylinder branch pipe 12 ... Second cylinder branch pipe 13 ... Third cylinder branch pipe 14 ... Fourth cylinder branch pipe 15 ... Surge tank

Claims (1)

Fuel injection valve connector for inputting a control signal which fuel is supplied via a delivery pipe Yes to protrude on the lower surface side, the multi-cylinder internal combustion engine mounted to the cylinder head corresponding to each cylinder, delivery An intake manifold having a plurality of branch pipes formed to be curved below a surge tank, which is mounted in a state where a pipe is positioned between the multi-cylinder internal combustion engine, and between a branch pipe located at both ends. Characterized in that the branch pipes are arranged unevenly and coarsely downward from the surge tank , and the delivery pipe is surrounded over substantially the entire length in the lateral direction of the multi-cylinder internal combustion engine.

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