JPH033048B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a blow-by gas reflux device,
In particular, it effectively avoids freezing of the PCV (positive crankcase ventilation) valve,
The present invention relates to a blow-by gas recirculation device that can prevent engine troubles from occurring.

[Technical background of the invention]

In an internal combustion engine, blowby gas is generated that leaks from the combustion chamber into the crankcase through a gap between the piston and the cylinder wall. Since the main component of this blow-by gas is unburned gas and contains a large amount of HC, it is necessary to lead it back to the combustion chamber and re-burn it. Therefore, there is a blow-by gas recirculation device, and the commonly used method is to use the negative pressure in the intake system of the internal combustion engine to draw it into the air cleaner and/or intake passage, and then recirculate it into the intake air and burn it again. It is led into a chamber and burned.

[Problems with background technology]

By the way, the blow-by gas recirculation device is designed to adjust the amount of blow-by gas recirculated to the intake system.
A PCV valve is provided. This PCV valve may freeze due to moisture in the blow-by gas at extremely low temperatures. However, with the conventional PCV valve mounting position, less heat is conducted from the internal combustion engine while the vehicle is running, and moreover, it is cooled by the wind while the vehicle is running (see Figure 3). As a result, the PCV valve became frozen while the vehicle was running, resulting in an inconvenience that could cause engine trouble. In other words, when the PCV valve freezes, all of the blow-by gas flows into the air cleaner and from there into the carburetor, and the moisture in the blow-by gas freezes inside the carburetor, causing malfunction of the carburetor, and also causing the air cleaner to overflow. When the blow-by gas flows in, the oil contained therein causes severe staining.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, an object of the present invention is to provide an intake passage in the intake passage member on the rear rear side of the cylinder head of an internal combustion engine, which extends from the gathering part of the carburetor side part to the intake side of the cylinder head. The blow-by gas passage, which starts near the rear rear surface and ends at the gathering part of the carburetor side part, has the intake passage member in which the intake passage is formed as at least one end of the passage wall, and is provided approximately parallel to the intake passage. By installing the PCV valve near the rear rear of the cylinder head of the member that forms the gas passage, it prevents the running wind from directly hitting the PCV valve, and also prevents conduction heat from the cylinder head and blow-by gas from the blow-by gas passage. The heated gas actively heats the PCV valve, effectively avoiding freezing of the PCV valve, preventing engine troubles due to malfunction of the carburetor, etc. It is an object of the present invention to realize a blow-by gas recirculation device which can also promote atomization of fuel and can achieve a good mixing state of an air-fuel mixture.

[Structure of the invention]

In order to achieve this object, the present invention provides a blow-by gas recirculation device that is provided with a PCV valve that adjusts the amount of blow-by gas recirculated in the middle of a path for recirculating blow-by gas to the intake system of an internal combustion engine. An intake passage is provided in the intake passage member on the rear rear side of the cylinder head of the internal combustion engine, and extends from the gathering part of the carburetor side part to the intake side of the cylinder head of the internal combustion engine, and the starting end is near the rear rear side of the cylinder head of the internal combustion engine. The blow-by gas passage which ends in the gathering part of the carburetor side part is provided at least in parallel with the intake passage, with the intake passage member in which the intake passage is formed being at least one side of the passage wall; The present invention is characterized in that the PCV valve is attached near the rear rear surface of the cylinder head of the internal combustion engine, which is a member forming a gas passage.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 shows a first embodiment of the invention. In the figure, 2 is the bonnet of the vehicle. Inside this bonnet 2, there are a cylinder head 6 and a rocker cover 8 that constitute an internal combustion engine behind a radiator grille 4 located at the front in the direction of vehicle travel.
In addition, an intake passage member (intake manifold) 10, a carburetor 12, an air cleaner 14, etc. are arranged behind these parts.

Inside the intake passage member 10, there is an intake passage 16 that communicates the carburetor 12 with an intake port (not shown) in the cylinder head 6, and an assembly part 16a on the carburetor 12 side of the intake passage 16, one end of which is a recirculation port. A blow-by gas passage 18 is formed, which is open at the cylinder head 6 and whose other end is opened near the rear rear surface of the cylinder head 6 and is in contact with the cylinder head 6.
That is, the intake passage member 10 is formed with an intake passage 16 extending from a gathering portion 16a on the side of the carburetor 12 to the intake side of the cylinder head 6. Further, the blow-by gas passage 18 whose starting end is near the rear back surface of the cylinder head 6 and whose recirculation port is opening at the gathering part 16a of the carburetor side portion at least connects at least the intake passage member 10 in which the intake passage 16 is formed. It is formed on one side of the passage wall and approximately parallel to the intake passage 16. A plug 2 is provided at the portion of the blow-by gas passage 18 that contacts the cylinder head 6.
0 is inserted to block that location.

Further, 22 is a three-way hose, and together with the blow-by gas passage 18, this three-way hose 22 constitutes a passage for circulating blow-by gas into the intake system. This three-way hose 22 is connected to a separator chamber 24 formed on the upper surface of the rocker cover 8 located above the cylinder head 6, the air cleaner 14, and the PCV valve 26 via pipes 28, 30, and 32, respectively.

The PCV valve 26 has a function of adjusting the flow rate of blow-by gas to be returned to the intake system, and as shown in FIG.
It is attached outside the intake passage member 10 near the rear rear surface, which is near the cylinder head 6 of the blow-by gas passage 18 formed inside. This PCV valve 2
6 is located near the rear rear of the cylinder head 6 and rocker cover 8, so the running wind A generated during driving is blocked by the cylinder head 6 and rocker cover 8, and the PCV valve 26
There is no direct contact with the Also, PCV valve 2
6 is efficiently heated by conduction heat conducted from the cylinder head 6 to the intake passage member 10. Further, the blowby gas in the blowby gas passage 18 is influenced by the heat of the intake passage member 10 heated by the conduction heat from the cylinder head 6, and becomes a heated gas that heats the PCV valve 26 and the intake passage member 10. It is. Further, since the blow-by gas passage 18 is provided at least on one side of the passage wall of the intake passage member 10 in which the intake passage 16 is formed and is provided substantially parallel to the intake passage 16, the blow-by gas in the blow-by gas passage 18 is The heating area is large. Furthermore,
In the collecting part 16a on the downstream side of the carburetor 12, high temperature blow-by gas flows into the collecting part 16a from the terminal opening of the blow-by gas passage 18.
Mixing of fresh air and fuel from the carburetor 12 side is promoted, and the mixed state of the air-fuel mixture is improved.

Next, the operation of this first embodiment will be explained.

The PCV valve 26, which has frozen while the vehicle is parked or parked, is heated and thawed by conduction heat conducted from the cylinder head 6 to the intake passage member 10 when the internal combustion engine is started. Also at this time, the blow-by gas passage 18
is formed in the intake passage member 10, the heat retention of the blow-by gas 18 is improved. Furthermore, the running wind A generated during running is blocked by the cylinder head 6 and the rocker cover 8, and does not directly hit the PCV valve 26 installed near the rear back of the cylinder head 6. There is no risk that the PCV valve 26 will cool down and freeze.

Further, in order to prevent the PCV valve 26 from being directly hit by the traveling wind A, a special protective cover is not required, the number of parts can be reduced, space is advantageous, and the cost can be reduced.

Furthermore, since the PCV valve 26 is provided outside the intake passage member 10, the PCV valve 26 can be easily attached and detached.

Furthermore, the blowby gas in the blowby gas passage 18 is influenced by the heat of the intake passage member 10 heated by the conduction heat from the cylinder head 6.
Since the PCV valve 26 is actively heated by the high temperature blow-by gas, the PCV
In addition to preventing the valve 26 from freezing, the intake passage member 10 is heated by the high-temperature blow-by gas.

Further, the blow-by gas passage 18 is connected to the intake passage 16.
Since the intake passage member 10 formed with the intake passage member 10 is provided at least on one side of the passage wall and is substantially parallel to the intake passage 16, the heating area of the blow-by gas in the blow-by gas passage 18 is large, and the blow-by gas becomes hot. The gas actively heats one side of the passage wall forming the intake passage 16, thereby heating the air-fuel mixture in the intake passage 16, thereby promoting atomization of the fuel.

Furthermore, by opening the end of the blow-by gas passage 18 to face the gathering portion 16a, the vaporizer 1
Since high-temperature blowby gas flows into the collecting part 16a on the second downstream side from the terminal opening of the blowby gas passage 18, mixing of fresh air from the carburetor 12 side and fuel is promoted, and the mixed state of the air-fuel mixture is good. become,
It is possible to supply uniform air-fuel mixture to each cylinder and maintain a good operating condition of the internal combustion engine.

As a result, the PCV valve 26 is not at risk of freezing due to the driving wind A, and even if it freezes while parked or parked, it is thawed early, avoiding malfunction of the carburetor, etc., and preventing the risk of engine trouble. do not have.

FIG. 2 shows a second embodiment of the invention. In the following embodiments, parts having the same functions as those in the first embodiment described above are designated by the same reference numerals.

This second embodiment is characterized by the following points. That is, the PCV valve 26 is connected to the blow-by gas passage 18 formed within the intake passage member 10.
It is attached midway and near the rear back surface of the cylinder head 6, and is completely buried within the intake passage member 10. In addition, the three-way hose 2
A pipe 32 directly connected to the blow-by gas passage is connected to the wall surface of the blow-by gas passage. The configuration other than this is the same as that of the first embodiment described above, so the explanation thereof will be omitted here.

According to the configuration of the second embodiment, the PCV valve 26 is embedded within the intake passage member 10 and is located near the rear back surface of the cylinder head 6.
Since the running wind A does not directly hit the cylinder head 6 and the heating and heat retention properties of the PCV valve 26 are improved, freezing of the PCV valve 26 can be more efficiently prevented, and the installation space can be reduced. Moreover, the soundproofing effect against the operating noise of the PCV valve is increased, and the discomfort caused during operation can be reduced.

〔Effect of the invention〕

As is clear from the detailed description above, the configuration of the present invention provides the following effects.

The running wind does not directly hit the PCV valve, and the heat conducted from the cylinder head
By heating the PCV valve, overcooling and freezing of the PCV valve can be effectively prevented, and engine troubles caused by freezing of the PCV valve can be avoided. In addition, in order to prevent the PCV valve from freezing, parts such as covers are unnecessary.
The configuration can be simplified, space-saving, and inexpensive.

The blowby gas in the blowby gas passage is affected by the heat of the intake passage members heated by conduction heat from the cylinder head and becomes a heated gas, so the PCV valve is actively heated by the high temperature blowby gas and the PCV In addition to preventing the valve from freezing, the intake passage member can be heated by the high-temperature blow-by gas.

Since the blow-by gas passage has the intake passage member in which the intake passage is formed as at least one side of the passage wall and is provided approximately parallel to the intake passage, the heating area of the blow-by gas in the blow-by gas passage is large and the blow-by gas is heated to a high temperature. The blow-by gas actively heats one side of the passage wall forming the intake passage, thereby heating the air-fuel mixture in the intake passage and promoting atomization of the fuel.

By opening the end of the blow-by gas passage facing the collecting part, high-temperature blow-by gas flows from the blow-by gas passage into the collecting part on the downstream side of the carburetor, so that fresh air from the carburetor side and fuel are mixed. Mixing is promoted, the mixture state of the air-fuel mixture becomes favorable, an even mixture is supplied to each cylinder, and the operating condition of the internal combustion engine can be maintained in good condition.

If the PCV valve is provided outside the intake passage member near the rear rear surface of the cylinder head, the PCV valve can be easily installed and removed.

By embedding the PCV valve in the intake passage member near the rear back of the cylinder head, the PCV valve can be efficiently heated by conduction heat, improving heating performance and heat retention, and reducing installation space. Moreover, PCV
Great soundproofing effect against valve operating noise,
Unpleasant noises generated during driving can be reduced.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the present invention, and is a schematic diagram of a blow-by gas reflux device. FIG. 2 shows a second embodiment of the present invention, and is a schematic diagram of a blow-by gas reflux device. FIG. 3 is a schematic diagram of a conventional blow-by gas reflux device. In the figure, 2 is a bonnet, 4 is a radiator grille, 6 is a cylinder head, 8 is a rocker cover, 10 is an intake passage member, 12 is a carburetor, 14 is an air cleaner, 16 is an intake passage, 18 is a blow-by gas passage, and 20 is a plug. , 22 is a three-way hose, 24 is a separator chamber, 26 is a PCV valve,
And 28, 30, and 32 are pipes.

Claims (1)

[Scope of Claims] 1. In a blow-by gas recirculation device that is provided with a PCV valve that adjusts the amount of blow-by gas recirculated in the middle of a path for recirculating blow-by gas to the intake system of an internal combustion engine, the internal combustion engine is An intake passage is provided in the intake passage member on the rear rear side of the cylinder head, from the gathering part of the carburetor side parts to the intake side of the cylinder head of the internal combustion engine. A blow-by gas passage whose terminal end opens at the gathering part of the parts is provided at least on one side of the passage wall of the intake passage member in which the intake passage is formed, and is provided substantially parallel to the intake passage, and forms the blow-by gas passage. A blow-by gas recirculation device, characterized in that the PCV valve is attached near the rear back surface of the cylinder head of the internal combustion engine as a member for blow-by gas. 2. The PCV valve is installed outside the intake passage member, which is a member forming the blow-by gas passage near the rear rear surface of the cylinder head.
The blow-by gas recirculation device according to claim 1, which is a PCV valve. 3. The PCV valve according to claim 1, wherein the PCV valve is a PCV valve embedded in the intake passage member in the middle of the blow-by gas passage formed in the intake passage member and near the rear rear surface of the cylinder head. Blow-by gas reflux device.