KR930012224B1 - Intake system for v-type engine - Google Patents

Abstract

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Description

Intake device of V engine

1 is a front view showing an embodiment of an intake apparatus of a V-type engine according to the present invention.

2 is a plan view.

3 is a side view.

4 is a longitudinal cross-sectional view.

* Explanation of symbols for main parts of the drawings

1: engine body 2,3: bank

4: cylinder 7: intake port

8,9: surge tank 10: high speed intake passage

11: communication path 12: low speed intake passage

14: on-off valve 15: throttle body

The present invention relates to an intake apparatus of an automobile V-type engine, and in particular, an intake passage for introducing intake air into an intake port of each cylinder according to the operating state of the engine, and a low-speed intake passage having a long path length and a high speed having a short path length. It relates to an intake apparatus of a V-type engine that can be appropriately switched to the intake passage.

Conventionally, Japanese Patent Application Laid-Open No. 62-162723 discloses an intake apparatus of this kind.

The intake system of the proposed method arranges a long surge tank along the cylinder arrangement direction above each bank of the V-type multi-cylinder engine, and each surge tank has a short path length for each cylinder of one bank below it. A high-speed intake passage for introducing intake air and a low-speed intake passage for introducing intake air with a long path length in each cylinder of the other bank are formed, and each of the high-speed intake passages blocks this passage at a low speed rotation range of the engine. An on-off valve is provided, and each of the surge tanks has a communication path communicating with each other at one end in the longitudinal direction thereof, and at the other end thereof, an intake relationship communicating with the air via an air cleaner. Is connected and comprised.

In the low-speed operation zone of the engine, the high-speed intake passages are closed by the on / off valves, and the intake ports of each cylinder of the right bank are interposed with the low-speed intake passage of the long path length from the surge tank on the left bank. While intake air is introduced, the intake port of each cylinder of the right bank is introduced from the surge tank above the left bank via a low speed intake passage having a long path length. In the high speed operation region, the high speed intake passage is opened so that intake air is introduced into each of the intake ports from the high speed intake port as well as the low speed intake port. That is, in this high-speed operation region, the intake port of each cylinder of each bank is filled with most of the air intake amount filled in the cylinder from the surge tank on one bank above it through the high-speed intake passage. It is to be introduced through the low speed intake passage from the surge tank on the side bank. In other words, the intake passage communicating with the intake port is switched in correspondence with the operation speed of the engine, whereby the engine operation is attained.

However, in the above-described conventional intake apparatus, each surge tank is used in the entire operating band from the low speed region to the high speed region to have an equivalent function. Therefore, the distribution of intake air to each cylinder of the left and right banks is equalized. In order to do this, each of these surge tanks is required to be symmetrically arranged in the symmetrical arrangement of the respective surge tanks, while symmetrically arranging the intake relations connecting upstream of the respective surge tanks. In relation to the surge tanks, it is necessary to arrange them in a position separated from the surge tanks upstream than the branch portions to the surge tanks.

Therefore, it cannot be said that the difference between the intake passage lengths to obtain the inertia and salary effect is effectively used. For example, the length of the entire intake passage including the throttle body upstream of the surge tank is further increased in the high speed operation region. There was a problem that it was long and the air intake efficiency was so damaged. In addition, the processing of the upstream intake pipe including the throttle body becomes relatively complicated, and there is an inconvenience in that it damages the appearance of the inside of the engine lure, or damages the assemblability and workability during maintenance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake apparatus of a V-type engine which can be compact in configuration, improves appearance, and can also improve a heating layer of intake efficiency. . The present invention constitutes the intake apparatus of the V-type engine in order to achieve the above object as follows.

That is, a pair of long surge tanks along the cylinder arrangement direction are disposed on each bank of the V-type multi-cylinder engine so as to face each other, and one side of the surge tank is disposed near the center between the banks. A throttle body is provided above the bank on one side of the surge tank, and the throttle body is connected to the one surge tank, and each surge tank communicates with the communication path crossing between the banks, The surge tank communicates with each of the cylinders through the high-speed intake passages with short path lengths, while the other surge tanks have a long intake port for each cylinder. And an on-off valve is provided in the high-speed intake passage to open the passage in the high-speed rotation region of the engine.

According to the intake apparatus of the V-type engine according to the present invention, since the high-speed intake passage is blocked by the opening / closing valve in the low-speed operation region of the engine, the intake air flows into one of the surge tanks from the throttle body and then through the communication passage. It flows into the other surge tank, and is introduced into each cylinder of each bank through the speed intake passage for a long path from this surge tank.

Further, in the high speed operation region, the on / off valve of the high speed intake passage is opened, and most of the intake air is introduced into each cylinder through the high speed intake passage of short path length from one surge tank, and part of the low speed use It is introduced through the intake passage.

Here, one of the surge tanks is disposed near the center between the banks, and the throttle body is disposed in the space formed on the outer banks connected to the surge tanks, so that the path length of the high-speed intake passage can be formed as short as possible. At the same time, the length of the intake pipes upstream of the surge tank can be made as short as possible to form a compact intake machine. Therefore, the upstream intake pipes can be easily processed, and the appearance of the engine in the engine tower is improved. Not only can the assembly and maintainability be improved, but also the ventilation resistance of the uptake side of the intake pipe can be reduced, thereby improving the intake efficiency, especially in the high-speed operation region.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

This example applies to a vertically arranged V-cylinder engine. FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a longitudinal sectional view.

The engine body 1 has three colors of cylinders 4 in each of the banks 2 and 3 facing each other in a V-shape to the left and right, and each cylinder head on the opposite surface of each of the banks 2 and 3. Intake ports 7 of respective cylinders are formed in (5) and (6), respectively. Above the right bank 5 of the engine body 1, a long first surge tank 8 in the shape of a cylinder is disposed, and above the left bank 3, a first surge tank ( In the arrangement opposite to 8), a long second surge tank 9 is arranged along the cylinder arrangement direction.

The first surge tank 8 is connected to the throttle body described later, and is mainly used for the high speed driving area. In other words, the first surge tank 8 communicates with the intake port 7 of each cylinder 4 via a high speed intake passage 10 having a short path length. The first surge tank 8 communicates with the second surge tank 9 by a communication path 11 formed between the banks 2 and 3 on the left and right.

On the other hand, the second surge tank 9 is mainly used for the medium to low speed operation region, and is connected to the intake port 7 of each cylinder 4 via the low speed intake passage 12 having a long path length. . In addition, the low-speed intake passage 12 is arranged in a two-stage configuration below the communication passage 11.

The intake passages 10 and 12 are once integrated at the center between the banks 2 and 3, and are then branched left and right by a bifurcated branching tube 13 so that each intake port 7 is formed. In communication with In addition, an on-off valve 14 is provided in the high-speed intake passage 10 at the integrated portion of each intake passage 10, 12. The on / off valve 14 has a shape such as a large diameter curved surface, for example, the surface of the intake port 7 is made to have a small cross-sectional area change of the low-speed intake passage 12 and a lower intake resistance. Arrangement is set and prevention of the torque fluctuation in the engine low speed operation area | region which performs intake air via the low speed intake passage 12 is aimed at.

By the way, the 1st surge tank 8 is located near the center between banks rather than the 2nd surge tank 9. As a result, the length of the high-speed intake passage 8 is set as short as possible, and a space is formed above the right bank 2. In the space above the right bank 2, a throttle body 15 is disposed, and the throttle body 15 is connected to an outer portion of the first surge tank 8. 15a is a pipe to an air cleaner connected to the throttle body 15 so as to be detachable, and 15b is an idle speed controller.

Therefore, according to the intake apparatus of the V-type engine formed in this way, in the engine low speed operation region, since the on-off valve 14 of the high speed intake passage 10 is closed, the intake air is discharged from the throttle body 15 on one side of the first intake valve. After entering into the surge tank 8, it flows into the other 2nd surge tank 9 via the communication path 11, and the low-speed inhaler with a long path length from this 2nd surge tank 9 is carried out. It is introduced into each cylinder 4 of each bank 2 and 3 via the passage 12.

That is, in the low speed operation region, since the first surge tank 8 communicated by the communication path 11 functions as a large surge tank in which two volumes are combined with the second surge tank 9, sufficient inertia performance The effect can be obtained.

In addition, in the high speed operation region, the on-off valve 14 is opened in the high speed intake passage 10, and most of the intake air is a high speed intake passage 10 having a short path length from one of the first surge tanks 8. It is introduced into each cylinder (4) through, and a part is introduced through the low speed intake passage (12).

Here, one of the first surge tanks 8 is disposed near the center between the banks, and the throttle body 15 is connected to the first surge tanks 8 so that the right banks 2 of the outer side of the right surge tanks 8 are disposed. Since it is disposed in the upper space, the length of the intake pipe including the throttle body 15 and the air cleaner upstream of the first surge tank 8 can be made as short as possible to form a compact intake machine. Therefore, the upstream air intake can be easily processed, and the appearance and assembly and maintenance of the engine lume can be improved.

In addition, since the length of the intake pipes upstream of the first surge tank 8 can be formed as short as possible, the length of the high-speed intake passage 8 itself can be set as short as possible. In particular, the ventilation resistance in the high speed operation region for introducing the intake air from the high speed intake passage 8 is reduced, whereby the intake efficiency can be improved in the high speed operation region as much as possible.

In addition, the first surge tank 8 has a shape in which the cross-sectional area is gradually expanded from the intake storage port on the side of the throttle body 15 toward the downstream side so as to follow the streamline of the intake air. As a result, the intake distribution at the time of high speed operation is improved.

Moreover, the piping which comprises the communication path 11 between the 1st surge tank 8 and the 2nd surge tank 9 is provided in the rear side of the amphibious tanks 8 and 9. As a result, the communication path 11 having the highest height in the intake system is arranged to the rear side. Therefore, the height relationship between the bonnet line (virtual line a in FIGS. 2 and 3) of the vehicle which is generally inclined in the front is inclined. In accordance with this, it is also suitable for a request for lower bonnet line.

In addition, the communication path 11 is connected to the EGR gas passage 16 and the PCV gas passage 17. The EGR gas passage 16 is led from an EGR valve 18 disposed at an approximately center portion between the banks and is connected to an upstream side of the communication passage 11. The RCV gas passage 17 is led from the cylinder head 6 portion of the left bank 3 and is connected to the downstream side of the communication passage 11. According to such a structure, since EGR gas and PVC gas flow in the long passage which consists of the communication path 11, the 2nd surge tank 9, and the low speed intake passage 12, mixing with air is performed sufficiently, And evenly distributed to each cylinder (4).

In addition, by connecting the EGR gas passage 16 upstream than the PCV gas passage 17, it is possible to sufficiently mix the EGR gas which has already influenced linearity, and the both passages 16 and 17 are arranged in reverse. In one case, no harmful effects such as oil content in the RCV gas, which are concerned, stick to the opening of the EGR gas passage.

A cold star art injector 19 is disposed in the communication flow path downstream of the throttle body 15 and upstream of the first surge tank 8. According to the arrangement of the cold start injector 19, the heavy fuel from the cold start injector 19 at the time of cold start together with the intake and the first surge tank 8, the communication path 11, the first Since the two surge tanks 9 and the low-speed intake passage 12 flow down and are supplied into the respective cylinders through a long path, a sufficient mixing effect is obtained in the meantime, and the distribution of fuel to each cylinder 4 is satisfactorily achieved. I can do it.

In addition, a negative pressure to the brake master bag or the like is provided in the branch pipe 13 downstream of the integrated portion between the high speed intake passage 8 and the low speed intake passage 12 via a check valve 20 which is opened and closed by intake negative pressure. A vacuum chamber 21 as a storage source is connected. The vacuum chamber 21 is disposed in a space portion formed by the upper wall between the V banks of the engine body 1 and the branch pipe 13. According to such a structure, the vacuum chamber 21 can be provided effectively using the space between upper V banks, and since the vacuum chamber 21 is arrange | positioned close to the cylinder 4 which is a negative pressure generation source, a large negative pressure is stored | stored. can do. Therefore, it is extremely effective as a negative pressure storage source, and the compactness of the vacuum chamber 21, brake master bag, etc. can also be attained.

In addition, each constituent pipe of the intake manifold forming the low speed intake passage 12 is formed to avoid the upper portion of the spark plug mounting position of each cylinder of the left bank, and a gap is formed therein. The plug cap 22 is inserted into the portion. The high tension cord 23 integrally connected to the plug cap 22 is caught by the cylinder head cover of the upper end of the left bank 6, thereby preventing fallout in maintenance inspection and the like.

As described in detail above, according to the intake apparatus of the V-type engine according to the present invention, one surge tank is disposed near the center between the banks, and the throttle body is connected to one surge tank of the outer bank. By disposing in the upper space, the path length of the high-speed intake passage can be made as short as possible, and the length of the intake pipe including the throttle body upstream of the surge tank is as short as possible to form a compact intake machine. can do.

For this reason, in particular, the ventilation resistance in the high speed operation region in which intake air is introduced from the high speed intake passage decreases, whereby the intake efficiency in the high speed operation region can be improved as much as possible. In addition, the upstream air intake can be easily processed, and the appearance and assembly and maintenance of the engine lume can be improved.

Claims (1)

On the banks of the V-type multi-cylinder engine, a pair of long surge tanks arranged along the cylinder arrangement direction are disposed to face each other, and one side of the surge tank is disposed near the center between banks. A throttle body is provided above the bank on the side of the surge tank, so that the throttle body is connected to the one surge tank, and each surge tank communicates with the communication path crossing between the banks, and the one surge tank The large intake port of each cylinder communicates with each other via a long intake passage for connection, while the other surge tank communicates with each other through an intake passage for connection with a long path. In addition, the high-speed intake passage is provided with an on-off valve for opening the passage in the high-speed rotation region of the engine, the intake of the V-type engine Value.