JPH045719Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is an engine intake system that includes a surge tank that forms an intake expansion chamber and a throttle body that has a built-in throttle valve. Regarding.

(Prior Art and its Problems) It is common practice to supply an additional intake gas such as EGR gas, blow-by gas, evaporative gas, etc. to an engine intake system (see Japanese Utility Model Application Publication No. 84164/1983).

By the way, in systems equipped with a surge tank in the intake system, the connection between the throttle body, which is located upstream of the surge tank, and the surge tank is generally done through a curved intake pipe due to layout considerations. In such an intake system, the intake pipe between the throttle body and the surge tank supports the heavy throttle body. For this reason, conventionally,
Countermeasures have been taken, such as installing a stay to support the throttle body, but it goes without saying that it is desirable that the intake pipe itself has enough rigidity to withstand the vibrations of the throttle body during engine operation.

Therefore, an object of the present invention is to provide an engine intake system in which the rigidity of the intake system is increased by the elements necessary for the intake pipe without providing any special reinforcing elements to the intake pipe. .

(Means and operations for solving the problems) In order to achieve the above technical problem, the present invention focuses on the above-mentioned intake additional gas passage and has the following configuration.

That is, the engine has an intake system that includes a surge tank that forms an intake expansion chamber and a throttle body that has a built-in throttle valve, and the throttle body and the surge tank are connected by a curved intake pipe. The intake device is based on the following structure: The intake pipe is provided with a plurality of ribs that intersect with each other, and intake additional gas passages are formed in each of the ribs.

With this configuration, the intake pipe is not only reinforced by the extra thickness of the ribs that constitute the intake additional gas passage, but also because such ribs are provided to intersect with each other. This results in reinforcement of the tube against vibrating elements in two directions, such as bending and torsion.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 2 and 3, symbol E indicates a V-type six-cylinder engine body, and the engine body E has two banks 2 and 3 on the left and right with the engine output shaft 1 in between.
Each of the cylinder groups of banks 2 and 3 is composed of cylinders whose ignition order is not adjacent to each other.

V formed between the left and right banks 2 and 3
A surge tank 4 is disposed above the bank central space X. This surge tank 4 extends in the direction of the engine output shaft 1, and as shown in FIG. As shown in FIG. 1, the interior of the engine 4 is divided into two chambers, a right intake expansion chamber 6 and a left intake expansion chamber 7, by a partition wall 5 extending in the direction of the engine output shaft, that is, in the longitudinal direction. There is. The right intake expansion chamber 6 and the left intake expansion chamber 7 are communicated with the cylinders of the banks 2 and 3 located on the opposite side through independent intake passages 8 and 9, respectively. That is, the independent intake pipes 10 and 11 constituting the independent intake passages 8 and 9 have their upstream ends connected to the intake outlet port 1 which opens into the right or left side wall of the surge tank 4.
2 and 13, once extends in a far direction from the left and right side walls of the surge tank 4, is turned back approximately 180 degrees, intersects below the surge tank 4, and is then connected to the side wall located inside each bank 2 and 3. The configuration is such that the long independent intake pipes 10 and 11 can be made as compact as possible. and,
These independent intake pipes 10 and 11 are integrally provided with an upwardly protruding pedestal 14 at the intersection thereof, and the surge tank 4 is seated on this pedestal 14. It is fixed.

A communication passage 30 extending in the longitudinal direction of the partition wall 5 in the surge tank 4 and a communication port 31 are formed in the vicinity of the front wall. These communication paths 3
0 and the communication port 31, the long communication path 30 forms a resonance tuning condition in a low engine speed range, while the short communication port 31 forms a resonance tuning condition in a high engine speed range. This communication port 31 is provided with an on-off valve 32 that is closed in a low rotation range. The partition wall 5 in which the communication passage 30 and the communication port 31 are provided also has bolt insertion holes 35 penetrating in the vertical direction.
are provided at intervals in the longitudinal direction of the partition wall 5, and the surge tank 4 is fixed by the tightening bolts 15 using these bolt insertion holes 35. The arrangement of the bolt insertion holes 35 is as follows:
In this embodiment, the bolt insertion hole 35 located on the front wall side of the surge tank 4 is provided on the center line of the surge tank 4, and the bolt insertion hole 35 located in the center is provided on the left side from the center line of the surge tank 4. A bolt insertion hole 35, which is offset toward the intake expansion chamber 7 side and located on the rear wall side of the surge tank 4, is arranged offset from the center line of the surge tank 4 toward the right intake expansion chamber 7 side. With this configuration, the tightening bolt 15 located on the rear wall side of the surge tank 4
and the tightening bolt 15 located in the center are positioned on either side of the center line of the surge tank 4,
These two tightening bolts 15 prevent the surge tank 4 from rolling.

Further, the surge tank 4 is provided with a double intake pipe section 16 that is integrated with the rear wall 4a, and two intake passages 17 and 18 are formed in the double intake pipe section 16. and the left intake expansion chamber 7. A throttle body 20 containing a throttle valve is connected to the upstream end of the dual intake pipe section 16. In this way, since the throttle body 20, which is a heavy object, is connected to the dual intake pipe section 16, additional intake gas such as EGR gas and blow-by gas is supplied to the dual intake pipe section 16 through the intake passage 1.
Two additional gas passages 21, 2 supplying to 7, 18
2 are formed so that they are orthogonal to each other, and the double intake pipe portion 16 is reinforced by the extra wall for forming such distribution passages 21 and 22.

To explain this point in detail with reference to FIGS. 4 and 5, the surge tank 4 and the throttle body 20 are connected via a double intake pipe section 16, and the double intake pipe section 16 is connected to the throttle body 20. 20 is disposed in the space above one bank 2, it has a curved shape that curves smoothly from the rear wall 4a of the surge tank 4 toward the space above the bank 2. In the middle of the dual intake pipe section 16, a first rib 40 extending straight along the bend of the dual intake pipe section 16 intersects with a second rib 42 perpendicular to the first rib 40, which extends straight along the bend of the dual intake pipe section 16. The passages 21 and 22 for the intake additional gas are formed in the first and second ribs 40 and 42, respectively. The additional gas passages 21 and 22 are formed by drilling holes, and the open ends 21a and 22a are used as intake additional gas introduction ports. In addition, in this embodiment, the distribution passage 21 in the additional gas passage 21
b is provided in the rear wall 4a of the surge tank 4, and this distribution passage 21b is also
It is also formed by drilling. Of course, the open end 21c of the distribution passage 21b is closed by a blind plug (not shown).

In this way, the intake passage 1 in the dual intake pipe section 16
Since the additional gas passages 21 and 22 for supplying intake additional gas to the intake pipes 7 and 18 are formed in the first and second ribs 40 and 42, the extra wall of the two ribs 40 and 42 allows the double intake pipe portion 16 to Of course, reinforcement is provided, and since these ribs 40 and 42 are provided so as to intersect with each other, the reinforcement is made effective by working together against vibrations in two directions of the dual intake pipe section 16. It will be done. In particular, in this embodiment, since the first rib 40 extends straight in the bending direction of the dual intake pipe section 16, it functions as a reinforcing member against vertical vibration of the dual intake pipe section 16. The second rib 42 orthogonal to the rib 40 allows the double intake pipe section 1 to
It functions as a reinforcing member against the torsional vibration of No. 6 (vibration in the direction of arrow T in FIG. 1).

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and includes the following embodiments.

(1) Dual intake pipe 1 with two passages 17 and 18
The number of intake passages is not limited to 6, and it may be provided with one intake passage.

(2) Although the positions of the first and second ribs 40 and 42 are not particularly limited, it is preferable to arrange them at vibration-sensitive parts such as the cantilever support point or the bending promotion point of the intake pipe 16. This is preferable for the purpose of the present invention.

(3) The additional intake gas includes secondary air that bypasses the throttle valve.

(4) The surge tank 4 and the intake pipe 16 may be separate bodies.

(Effects of the invention) As is clear from the above explanation, according to the invention, the intake pipe that connects the surge tank and the throttle body is reinforced by the extra wall of the rib that constitutes the intake additional gas passage. It is possible to effectively improve the rigidity of a portion of the intake system that is susceptible to vibration without providing any special reinforcing elements.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a surge tank, FIG. 2 is an explanatory diagram showing the arrangement of the surge tank for a V-type engine, and FIG. 3 is an explanatory diagram of the layout of an intake system in a V-type engine. FIG. 4 is a side view of the surge tank, and FIG. 5 is a view of the surge tank seen from the left side (arrow A in FIG. 1). E...V-type engine, 4...Surge tank, 1
6... Dual intake pipe section, 20... Throttle body, 20, 21... Intake additional gas passage, 40, 4
2...Rib.

Claims (1)

[Scope of Claim for Utility Model Registration] The intake system of an engine includes a surge tank forming an intake expansion chamber and a throttle body having a built-in throttle valve, and the throttle body and the surge tank are connected to a curved intake pipe. In the engine intake system connected in this way, the intake pipe is provided with a plurality of ribs that intersect with each other, and intake additional gas passages are formed in each of the ribs. Intake device.