JPS636445Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an air cleaner for internal combustion engines.
In particular, it relates to an air cleaner for internal combustion engines that removes contaminants such as lubricating oil by forming a flat flow path for blowby gas in the intake chamber of the air cleaner, distributes the blowby gas evenly, and stabilizes idling at high temperatures. .

[Technical background of the invention]

In an internal combustion engine, blow-by gas is generated that leaks into the combustion chamber crankcase. This gas contains large amounts of HC, CO, etc., so if released outside, it will contribute to air pollution. Therefore, a reflux device is used to prevent the dissipation and guide the waste to the combustion chamber where it is re-burned and purified. Blowby gas is refluxed by using the negative pressure of the engine intake system to be drawn into the air cleaner and intake passage, refluxed into the intake air, and guided into the combustion chamber.

[Problems with background technology]

By the way, there is a device that recirculates blow-by gas to an air cleaner, for example, one that is installed approximately along the center of the air cleaner. In this case, the blow-by gas has to be introduced from the side of the air cleaner, making it difficult to evenly distribute the blow-by gas to each combustion chamber.

That is, in order to distribute and supply intake air to the combustion chamber,
In the case of an air cleaner having two air supply ports in the intake chamber, blow-by gas will flow into one air supply port in a biased manner. Therefore, at high temperatures, a large amount of blow-by gas flows into one of the combustion chambers, causing an increase in CO and worsening combustion. This deterioration in combustion disrupts the combustion balance between the combustion chambers of the engine, resulting in unstable idling. In addition, contaminants such as lubricating oil and carbon in the blow-by gas contaminate the air cleaner and the carburetor, and also cause poor vaporization and adversely affect the air-fuel ratio, reducing operational performance.

Therefore, it was necessary to provide a separator for lubricating oil or the like in the middle of the blow-by gas introduction path. There are also air cleaners that have a lubricating oil separation section in the main body, and a cylindrical distribution section that distributes blow-by gas from this separation section to each air supply port (Utility Model No. 55-10600, Utility Model No. 10600, 56-24258). However, the devices disclosed in these publications have a large number of parts and a complicated structure, which requires time and effort to manufacture and assemble, which is disadvantageous in terms of cost. Furthermore, the outlet opening of the blow-by gas in the distribution section is provided above the air supply port, and the blow-by gas is sucked downward toward the air supply port by the negative pressure of the intake system, so that the lubricating oil can be separated and removed. There was an inconvenience that the blow-by gas, which was on the rise, could not be smoothly delivered to the air supply port.

[Specific purpose of the idea]

This invention solves these problems, removes contaminants such as lubricating oil, and allows blow-by gas to be smoothly delivered to the air supply port and distributed evenly, thereby stabilizing idling at high temperatures. It is an object of the present invention to realize an air cleaner for an internal combustion engine that has a small number of parts, a simple structure, and is advantageous in terms of cost.

[Structure of the idea]

To achieve this objective, this invention provides an air cleaner in which the intake chamber is provided with at least two air supply ports for distributing and supplying intake air to the combustion chamber.
A blow-by gas introduction port is provided below the intake chamber adjacent to one of the two air supply ports. In order to evenly send this blow-by gas from the two air supply ports, a partition plate is provided to partition the introduction port and one of the air supply ports, and this partition plate is used as a constituent wall of the front panel of the intake chamber. A flat flow path is formed by the bottom plate and the partition wall, and this flow path starts at the introduction port and ends at an opening provided below an intermediate position of the plurality of air supply ports.

In this way, by increasing the flow area with the flat flow path, the blow-by gas is cooled and contaminants such as lubricating oil are removed, and the blow-by gas, which tends to rise due to the removal of lubricating oil, is When the air flows out from the opening of the flat flow path provided below the middle position of the air supply port, it naturally flows toward the two upper air supply ports and is evenly divided.

[Example of idea]

Next, an embodiment of this invention will be described in detail based on the drawings. 1 to 4 show an embodiment of an air cleaner for an internal combustion engine according to this invention. In the figure, 2 is an air cleaner, 4 is a main body of the air cleaner, and 6 is an intake air distribution case. The main body 4 of the air cleaner 2 is provided with an intake cylinder 8 for taking in air, and has a built-in filter element 10 to remove dust from the intake air. Main body 4 and distribution cabinet 6
are connected to each other via a partition wall 30, and this partition wall 30
The air intake passages 12 are interlocked with each other. The air that has passed through the filter element 10 flows through this intake passage 12 into an intake chamber 14 within the distribution housing 6. The intake chamber 14 communicates with two air supply ports 18-1 and 18-2 provided on the front plate 16 of the distribution housing 6 in order to distribute intake air to a combustion chamber (not shown). Note that 20 is a connecting member to the vehicle body.

A blow-by gas introduction port 22 is provided below the front plate 16 of the air intake chamber 14, adjacent to one of the two air ports 18-1 and 18-2. This introduction port 22 and one air supply port 18-
A partition plate 24 is provided between the intake chamber 1 and the intake chamber 1 to partition the inside of the intake chamber 14. The partition plate 24 has a horizontal member 24-1 that has a length that reaches an intermediate position between the two air supply ports 18-1 and 18-2, and a length that reaches the bottom plate 26, as shown in FIGS. It consists of a hanging member 24-2. Horizontal member 24-1 and hanging member 24-
The side edges 28-1 and 28-2 of the air intake chamber 2 are fixed to the front plate 16 and the partition wall 30 of the intake chamber 14 in the distribution housing 6, as shown in FIG. In addition, the hanging member 24-2
The lower edge 32 of is fixed to the bottom plate 26 of the intake chamber 14 .

As a result, the partition plate 24 and each part of the front plate 16, the bottom plate 26, and the partition wall 30 of the intake chamber 14 are connected to the inlet 22 of the intake chamber 14 and the air supply port 18-
1, and has a starting end opening at the introduction port 22 and a terminal opening opening at an opening 34 provided at an intermediate position below the two air supply ports 18-1 and 18-2.
form. Note that 38 is a blow-by gas conduit that communicates with the inlet 22.

Next, the effect will be explained.

In the figure, the broken line arrow indicates the flow direction of the blow-by gas in the flat flow path 36, and the dashed-dotted line arrow indicates the flow direction in the intake chamber 14. As shown by solid arrows in FIG. 4, the air taken in from the intake cylinder 8 has dust removed when it passes through the filter element 10, and then flows into the intake chamber 14 from the intake passage 12. From the intake chamber 14, each air supply port 18-1.
It is distributed and supplied to the combustion chamber by 8-2.

Blowby gas, which is guided to the combustion chamber together with the intake air and is to be reburned, flows from the conduit 38 into the flat flow path 36 via the inlet 22 below the intake chamber 14.
The blow-by gas in the flow path 36 flows through in the direction shown by the dashed arrow and reaches the opening 34 . At this time, the blow-by gas flowing through the flat channel 36 is cooled because the channel wall surface is large, and contaminants such as lubricating oil can be removed. The removed lubricating oil and the like can be easily drained by tilting the bottom plate 26 arbitrarily as shown in FIG. 2 and providing a drain hole 40 at the lower end of the slope.

The blow-by gas, which tends to rise due to the removal of lubricating oil that has flowed into the intake chamber 14 from the opening 34, passes through the opening 34 to the air supply ports 18-1 and 18-2.
By providing the air at a lower intermediate position, the air flows naturally toward the upper two air supply ports 18-1 and 18-2, and is evenly divided. Therefore, the blow-by gas is smoothly delivered together with the intake air and evenly distributed to the combustion chambers from each air supply port 18-1 and 18-2, which prevents the combustion balance in each combustion chamber from collapsing and reduces idling. can be made stable.
Furthermore, since the front plate 16, bottom plate 26, and partition wall 30 of the intake chamber 14 are used, and the partition plate 24 forms the flat flow path 36, the number of parts is small and the structure is simple, which is advantageous in terms of cost. be able to.

[Effect of idea]

As described above, according to this invention, since the flow path area is increased by the flat flow path, blow-by gas can be cooled and contaminants such as lubricating oil and carbon can be removed. The removed lubricating oil can be easily discharged because the flat flow path is provided below the intake chamber. In addition, the blow-by gas, which tends to rise due to the removal of lubricating oil, naturally flows toward each air supply port above, allowing for smooth air supply.This allows it to be evenly distributed and supplied to the combustion chamber. can. Therefore, the amount of blow-by gas intake in each combustion chamber is equalized, which eliminates the increase and variation in CO value at high temperatures and stabilizes idling. Furthermore, a flat flow path is formed by providing a partition plate using the front plate, bottom plate, and partition wall of the intake chamber, and the number of parts is small and the structure is simple, making it advantageous in terms of cost. It is something that can be done.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the air cleaner for an internal combustion engine according to this invention, where Figure 1 is a plan view, Figure 2 is a front view, Figure 3 is a cross-sectional view taken along the - line in Figure 1, and Figure 4 is a FIG. 2 is a sectional view taken along the - line in FIG. 1; In the figure, 2 is an air cleaner, 10 is a filter element, 12 is an intake passage, 14 is an intake chamber,
18-1 and 18-2 are air supply ports, 22 is an inlet port, 2
4 is a partition plate, 34 is an opening, and 36 is a flat channel.

Claims (1)

[Scope of utility model registration request] In an air cleaner in which an intake chamber is provided with at least two air supply ports for distributing and supplying intake air to a combustion chamber, an inlet for blow-by gas is provided below the intake chamber adjacent to one of the air supply ports; A partition plate is provided to partition the opening and one of the air supply ports, and the partition plate is used as a constituent wall, and a front plate, a bottom plate, and a partition wall of the intake chamber are used to open a starting end at the introduction port and supply the plurality of air. 1. An air cleaner for an internal combustion engine, characterized in that a flat flow path is formed in an opening provided at an intermediate position below the mouth and ends at an opening.