JPH055247Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an arrangement structure of a surge tank that is interposed in an intake passage of a vehicle engine to ensure a stable supply of intake air.

[Prior Art] Recently, with the spread of engines equipped with injectors, many vehicle engines are equipped with a surge tank in the intake passage to enable a stable supply of intake air to each cylinder. The surge tank is usually formed in the shape of a rectangular parallelepiped with an arbitrary volume, and is generally mounted parallel to the longitudinal direction of the engine body. An air inlet that communicates with the inside of the throttle body is opened at one end in the longitudinal direction, and this air inlet is located on the brake booster or master cylinder side arranged on the dash panel side, while the air inlet is placed on the side of the cylinder row connected to the intake pipe. There are many cases in which one side wall has the same number of air outlet ports as the number of cylinders.

In addition, in an engine equipped with an injector, the delivery pipe that distributes fuel to the injector is located between the engine body and the surge tank in the direction of the cylinder row, while the throttle body is equipped with control equipment such as a throttle opening sensor. There are many.

On the other hand, in order to obtain high torque over a wide range by uniformly distributing the intake air to each cylinder and increasing the inertial supercharging of the intake air to increase the efficiency of filling the combustion chamber, each intake pipe must be the same. It is desirable that it be formed to have a desired length. Therefore,
Various efforts have been made to ensure that the intake pipes have the same length as required. As a specific prior art, as shown in Japanese Utility Model Application Laid-open No. 61-59863, there is a technique in which a surge tank is placed closer to the darts panel to ensure the required length of the intake pipe.

[Problems that the invention aims to solve] However, in front-engine/front-drive vehicles in which the engine is mounted horizontally in the engine room, it is difficult to prevent fuel leakage by preventing damage to the fuel supply path in the event of a collision. In order to prevent this, the fuel supply device etc. must be placed on the passenger compartment side. As a result, in vehicles that adopt the F/F system,
The surge tank is relatively often placed close to the darts panel that partitions the engine room and the passenger compartment. Therefore, it is not easy to extend the intake pipe toward the passenger compartment and ensure the required length.

In order to solve this problem, it has been devised to place the surge tank at a relatively higher position than the intake port and extend the intake pipe. The throttle body and the air hose upstream of the throttle body often interfere with the brake booster, master cylinder, etc.

This invention does not cause any trouble to other devices.
It is an object of the present invention to provide a surge tank arrangement structure that can make intake pipes of equal length and maintain an optimal length that enhances the inertia effect of intake air.

[Means for Solving the Problems] In order to achieve the above object, the present invention disposes the engine body horizontally in front of the dash panel in the engine room at the front of the vehicle body, and connects the intake port of the engine body with the surge In the device in which the inside of the tank is communicated with the inside of the tank via a plurality of intake pipes formed to have the same length, the surge tank is disposed at a higher position than the intake port, and the axis of the surge tank is aligned with the dash panel. Form the air inlet side of the surge tank in a dogleg shape so that it is slanted away from the engine body, and form each intake pipe so that the shortest distance between it and the dash panel is equal. It is characterized by opening toward the engine main body side, and making the axis of the surge tank and the axis of the air inlet intersect at a specific angle.

[Function] In a passenger car type vehicle, the engine compartment is usually formed so that the cabin side is higher than the front end of the vehicle body. According to the above configuration, the surge tank is located at the highest position in the engine room, on the passenger compartment side, and at a relatively higher position than the intake port, so the inside of the surge tank and the intake port are communicated. It is possible to secure a plurality of intake pipes having the same length and a required length to enhance the inertial effect of intake air.

Furthermore, since the air inlet side of the surge tank is located away from the engine body, a space is formed between the surge tank and the engine body, and control equipment such as a throttle opening sensor can be disposed in this space without any hindrance. Moreover, since the air inlet opens toward the engine body, the throttle body, air hose, etc. connected upstream of this air inlet will not interfere with the brake booster, master cylinder, etc. installed on the adjacent darth panel side. can be avoided. Furthermore, since the shortest distance between each intake pipe and the dash panel is equal, in other words, the straight line formed by connecting the sides of each intake pipe closest to the dash panel is parallel to the dash panel, collisions may occur. When the engine body moves rearward and collides with the dash panel, force is evenly applied to the dash panel from the intake pipe, making it possible to prevent damage to only a specific portion of the dash panel.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a plan view schematically showing the front part of a passenger car type vehicle body that employs a front engine/front drive system.

The vehicle 1 shown in the drawing has an engine body 3 placed horizontally in an engine room 2. An exhaust pipe (not shown) is attached to the front end of the engine body 3, and an intake system and an air intake system are installed in the passenger compartment 4 side. A fuel supply device such as an injector is provided to mix fuel into the intake system. The air cleaner of the intake system and the throttle body 5 downstream thereof are connected via an air hose 6, and a surge tank 7 is provided downstream of the throttle body 5 to enable a stable supply of air to each cylinder. The surge tank 7 is arranged at a higher position than the intake port 8 of the engine body 3, and the inside of the surge tank 7 and the intake port 8 are communicated via a plurality of intake pipes 9 formed to have the same length. That's what I do.

The intake pipe 9 includes a front part 10 integrally formed with the surge tank 7, and a rear part 11 detachably interposed between the front part 10 and the engine body 3. The front part 10 is a darts panel 1
It is composed of branch parts 13 to 16 for each cylinder that extend downward in a curved manner from the rear wall 7a of the surge tank on the second side. Air passage 1 that guides air
3a to 16a are formed. One end of each of these air passage ports 13a to 16a is opened at the lower part of the inner surface of the rear wall 7a of the surge tank to form air outlet ports 13b to 16b, and the other end is opened to a series of flanges formed at the lower end of the front section 10. Connection ports 13c to 16c are opened in the end surface 17a of the rear part 11 and communicate with each branch part 18 to 21 of the rear part 11.

The rear stage part 11 interposed between the front stage part 10 and the engine main body 3 has branch parts 18 to 21 that are curved in a substantially horizontal direction in the mounting position and make the intake pipe 9 of equal length.
Air passages 18a to 21a that communicate with air passages 13a to 16a of the front section 10 are formed inside the air passages 18a to 21a, respectively. One end of each of these air passages 18a to 21a is connected to the end surface 2 of a flange 22 connected to the flange 17 of the front section 10.
Connection ports 18b to 21b are opened at 2a and communicated with the connection ports 13c to 16c, and the other end is an end face 23 of a flange 23 connected to the engine body 3.
A connection port 18c that opens at a and leads to the intake port
~21c. The air passages 13a to 16a of the front part 10 and the corresponding air passages 18a to 21a of the rear part 11 are connected to the flanges 17, 22.
The inside of the surge tank 7 and the intake port 8 are communicated at the same length. Note that the openings 24 to 27 formed in the vicinity of each of the connection ports 18c to 21c of the rear part 11 are for mounting an injector for injecting fuel into the intake port 8.

On the other hand, the surge tank 7 has its air inlet 28
Its side is located on the side of the brake booster 29 fixed to the dash panel 12, and it is also slightly moved toward the side opposite to the air inlet with respect to the engine body 3. An air inlet 28 is formed in a dogleg shape extending away from the engine body 3 from the center thereof so that the axis of the surge tank 7 is inclined with respect to the dash panel 12. To be more specific, the surge tank 7 is gradually curved in a direction away from the engine body 3 from the central portion to the end wall 7b side, and the end wall 7b portion is curved again toward the engine body 3 side, and the central portion of the end wall surface 7c is curved again. An air inlet 28 is opened at the bottom. That is, the axis of the surge tank 7 and the axis of the air inlet 28 intersect at a specific angle.

According to such a configuration, there is a space between the engine body 3 and the dash panel 12, which are placed horizontally.
The surge tank 7 is located at a higher position than the intake port 8. The inside of this surge tank 7 and the intake port 8 are air passages 13a to 16a formed in the front part 10 of the intake pipe 9 extending downward from the rear wall 7a of the surge tank 7.
Then, from below the front section 10, the engine body 3
It is formed in the rear part 11 extending toward the air passages 18a to 21a, and is communicated with the air passages 18a to 21a to have equal lengths. In addition, the branch portions 13 to 16 of the intake pipe 9 for each cylinder are arranged so that the shortest distance between them and the dash panel 12 is at equal intervals, in other words, the line segment connecting the outermost parts thereof is parallel to the dash panel 12. It is formed like this.

On the other hand, the end wall 7b portion of the surge tank 7 where the air inlet 28 is opened has a dogleg shape that moves away from the engine body 3, and a space is formed between this dogleg-shaped concave portion and the engine body 3. That will happen. On the other hand, since the air inlet 28 faces toward the engine body 3, the throttle body 5 connected to the end wall 7b and the air hose 6 upstream of the throttle body 5 are connected to the engine body 3 and the dash panel 1.
It will be located between the brake booster 29 and the like fixed to the brake booster 2.

Therefore, if the surge tank 7 has the configuration and operation as described above, the surge tank 7 can be installed in the vehicle compartment 4 which has a relatively large vertical space within the engine room 2.
Therefore, the intake pipe 9 that communicates the inside of the surge tank 7 with the intake port 8 can be extended upward by a required distance without interfering with the dash panel 12. Therefore, the corresponding air passages 13a to 16a, 18a to 21a in the intake pipe 9 leading to each cylinder are of equal length.
Moreover, it can be formed to an optimal size that maximizes the inertial effect of intake air. As a result, air is uniformly distributed to each cylinder, so there is no variation in output, and torque performance can be improved over a wide range of operating ranges.

In addition, since the air inlet 28 side of the surge tank 7 is formed in a dogleg shape, a concave space is formed between it and the engine body 3 side, and the engine body 3 etc. can interfere with this space. Throttle opening sensors and the like can be placed without any problems. Furthermore, since the air inlet 28 faces the engine body 3 side, the throttle body 5 located upstream of the air inlet 28, the air hose 6 leading to the air cleaner, etc. are connected to the brake booster 29 attached to the dash panel 12 nearby. It can be located between the master cylinder etc. and the engine body 3. Therefore, maintenance and inspection of these devices and the like can be performed without interfering with other adjacent devices, thereby improving maintainability.

In the above embodiment, the intake pipe is composed of a front part formed integrally with the surge tank and a rear part located on the engine body side, but the present invention is not necessarily limited to this, and the drawings It is also possible to modify the shape of the intake pipe etc. shown in the figure in various ways.

[Effects of the invention] According to the arrangement structure of the surge tank according to the invention, it is possible to form a plurality of intake pipes with equal lengths, and to obtain the inertial efficiency of the intake air over a wide range of engine rotation ranges. Since the cylinder can be formed in a straight line, stable output can be obtained between each cylinder, and high torque can be obtained over a wide operating range.

In addition, the shortest distance between each intake pipe and the dash panel is the same distance, in other words, the straight line formed by connecting the side surfaces of each intake pipe closest to the dash panel is parallel to the dash panel, so in the event of a collision, the engine When the main body moves rearward and collides with the dash panel, force is evenly applied to the dash panel from the intake pipe, making it possible to prevent damage to only a specific portion of the dash panel.

Moreover, because the air inlet side of the surge tank is dogleg-shaped, the surge tank will not interfere with other equipment that has been previously installed, and will not interfere with maintenance near the air inlet. The problem will also be resolved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Fig. 1 is a plan view schematically showing the front of the vehicle body, Fig. 2 is a plan view of the surge tank and intake pipe, Fig. 3 is a front view of the surge tank and intake pipe, and Fig. 4 is a surge tank and intake pipe. It is a side view of a partial cross section. 1... Vehicle body, 3... Engine body, 7... Surge tank, 9... Intake pipe, 10... Front stage section, 11
... Rear section, 12 ... dash panel, 13a-1
6a...Air passage, 13b-16b...Air outlet, 18a-21a...Air passage, 28...Air introduction port, 29...Brake booster.

Claims (1)

[Scope of utility model registration request] The engine body is placed horizontally in front of the dash panel in the engine room at the front of the vehicle body, and the intake port of the engine body and the inside of the surge tank are communicated via a plurality of intake pipes formed to have the same length. In the engine, the surge tank is arranged at a higher position than the intake port, and the air inlet side of the surge tank is formed in a dogleg shape to move away from the engine body so that the axis of the surge tank is inclined with the dash panel. Then, form each suction pipe so that the shortest distance between it and the dash panel is the same, and open the air inlet toward the engine body to align the surge tank axis and the air inlet axis to a specific position. A surge tank arrangement structure characterized by intersecting at different angles.