JPS63176652A - Intake device for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve the engine output and stability by forming the collection part for the branched pipes into a nearly circular section and arranging the opened port parts of the branched pipes in the peripheral direction according to the intake order and reducing and uniformalizing the intake resistance. CONSTITUTION:In an air passage 6, the collecting part is formed into circular section, and a partitioning wall 16 for partitioning each opened port part 11A-14A of the branched pipes into a nearly fan-shaped section is formed. The partitioning wall 16 is formed into a radial form with respect to the center shaft in the collection part, and each branched pipe 11-14 crosses at right angles with the collection pipe and curved to convert the intake stream from the vertical direction to the horizontal direction. The ignition order of a four cylinder engine is #1-#3-#4-#2, and intake operation is carried out in the order of the branched pipes 11, 13, 14, and 12. The opened port parts of the branched pipes are arranged clockwise in the order of 11A, 13A, 14A, 12A according to the intake order.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to 1. an intake system for an internal combustion engine;

(Prior Art) In order to suppress intake air interference and increase intake efficiency, there is a conventional intake system for an internal combustion engine, such as the one shown in Figure 3 ([New Automotive Engineering Handbook] Part 4) (Refer to Society of Automotive Engineers of Japan, published September 30, 1982, pp. 1-25).

To explain this, branch pipes 21, 22, 23° 24 branch off from a collector portion 25 having a predetermined volume to each cylinder in a substantially orthogonal manner. Fuel injection valves (not shown) are each provided.

The intake air that has passed through the throttle valve 26 has a flow velocity reduced in the collector section 25 where the cross section of the flow path is enlarged, and flows through each branch pipe 21, 22, 23° 24 into the cylinder in response to the intake stroke of each cylinder. is inhaled.

(Problem to be solved by the invention) However, the four branch pipes connected to the collector part are #
1. #2. #3. They are arranged in the order of #4 cylinders, but the alpha firing order of each cylinder is $1. #3. #4゜#2 cylinder is in this order, and the speed of the intake air is converted forward, backward, left and right as shown by the arrows, so a smooth flow cannot be obtained due to the inertial force of the intake, increasing intake resistance. There was a problem with that.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention forms an aggregating portion where branch pipes branching into the tea flh are assembled into a substantially circular cross section, and the opening of each branch pipe in this aggregating portion is formed in a cross section. Partition walls partitioning into approximately fan shapes are formed radially about the central axis of the gathering part, and the r of each branch pipe is
The N1 parts are arranged in the circumferential direction in accordance with the suction order.

(Function) Based on the configuration described in Section 2, the intake air drawn into the openings of each branch pipe as the engine rotates moves sequentially in the circumferential direction, so that the intake air flowing through the gathering part becomes a swirling flow, and the intake air flows into each branch pipe. To make the velocity change small and uniform when flowing into a branch pipe. the result,
It distributes intake air evenly to each cylinder, reduces intake resistance, and improves output and torque.

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

As shown in FIGS. 1 and 2, the intake passage provided in the in-line four-cylinder engine 1 includes intake boats 4 facing the cylinders 2 through intake valves 3, and branch pipes 11 connected to each intake boat 4.
, 12, 13.14 and each branch pipe 1.1. ．． 12.13
．． Air cleaner 6 and air chamber 7 that collect i 4
, and an air cleaner (not shown). A fuel injection valve 5 is disposed at a tip F4 of each branch pipe 11, 12, 13, 14 toward each intake boat 4. In addition, in the figure, 8 is a piston, and 9 is an exhaust pipe.

After the flow of intake air taken in from the air cleaner passes through the throttle valve 10, it is converted from a horizontal direction to a vertical direction by an air chamber 7 that curves approximately perpendicularly, and then flows from the air chamber 7 through the air cleaner 6 to each branch pipe 3. 3. ．． 12. i
Divided into 3 and 14.

The air cleaner 6 has a collecting part 15 having a circular cross section, and openings 11A, 1 of each branch pipe in this collecting part 15.
A partition wall 1G is formed that partitions 2A, 13A, and 14A into a substantially fan-shaped cross section. The partition wall 16 is formed symmetrically about the central axis of the gathering part 15, and has openings 11A, 12A, 13A of each branch pipe.
, 14A are made equal.

The partition wall 16 is formed radially about the central axis of the collecting part 15, and each branch pipe 11, 12, 13, 14 is curved approximately perpendicular to the collecting part 15, and
Converts the intake flow derived from the vertical direction to the horizontal direction.

The ignition order of this four-cylinder engine 1 is 1. #3゜#4.
There are two cylinders in this order, and branch pipes 11, 13, 14.
Inhalation is performed in the order of 12. According to this suction order, the opening of each branch pipe is moved in the counterclockwise direction (
They are arranged in the order of 11A, 13A, 14A, and 12A in the circumferential direction).

Based on the above configuration, the air chamber 7 functions to smoothly bend the flow of intake air in the direction of the central axis of the gathering portion 15 and to provide a uniform flow velocity distribution in the circumferential direction.

In the gathering part 15, the intake air flow has an axial vector, and the opening of each branch pipe is 11A.

Since the components 13A, 14A, and 12A are arranged in a counterclockwise direction according to the intake order, the rotation vectors in the counterclockwise direction are combined to form a swirling flow as roughly shown by the arrow. This prevents the flow of intake air in the gathering portion 15 from being converted in the front, back, left and right directions and causing turbulence, and the loss of velocity energy can be minimized. As a result, even in high-speed, high-load ranges where the intake speed is high, intake efficiency is improved and maximum output can be significantly increased. Since the collecting part 15 always has a flow vector in the suction direction, the collecting part 1
5 is considered as one long tube system for each branch tube 11, 12, 13.
This increases intake efficiency and significantly increases torque. Furthermore, by preventing the flow direction of the intake air in the collecting section 15 from being changed from front to back and left and right, the amount of intake air drawn from the collecting section 15 to each branch school 'l'l 1, 12, 13.14 is made equal. , preventing variations in the air-fuel ratio of each cylinder.

(Effects of the Invention) As described above, the present invention forms the collecting part of the branch pipes branching into each cylinder to have a substantially circular cross section, and also forms the partition wall that partitions the opening of each branch pipe into a substantially fan-shaped cross section at the collecting part. The openings of each branch pipe are arranged in the circumferential direction according to the intake order, which reduces and equalizes the resistance of intake air drawn from the gathering part to each branch pipe, and improves engine performance. Improved output and stability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX in the same figure. Figure ttS3 is a sectional view showing a conventional example. 1... Engine, 2... Cylinder, 5... Fuel injection valve, 10... Throttle valve, 11, 12, 13. 14... Branch pipe, 11A. 12A, 13A, 14A... Opening, 15... Gathering part, 16... Partition wall Figure 1 16... Partition wall

Claims (1)

[Claims] A collection part that collects branch pipes that branch into each cylinder is formed with a substantially circular cross section, and partition walls that partition the openings of each branch pipe in this collection part with a substantially fan-shaped cross section are formed radially about the central axis of the collection part. An intake device for an internal combustion engine, characterized in that the openings of the branch pipes are arranged in the circumferential direction in accordance with the intake order.