JPS6315586Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air cleaner for an engine installed in a vehicle, etc., and in particular, the invention is concerned with air cleaners for engines installed in vehicles, etc. Regarding improvements to air cleaners that are equipped with anti-water lock valves that allow external air to be taken in as a countermeasure in cases where air intake becomes impossible due to blockage, or where the amount of air intake is insufficient due to operating conditions. It is something.

[Prior Art] In the air cleaner equipped with the above-mentioned anti-water lock valve, if the air intake path is blocked by water etc. that has entered the air cleaner through the inlet pipe and air intake is impossible, or depending on the operating conditions, the air intake may be stopped. When the amount of air is insufficient, the anti-water lock valve opens due to the increase in negative pressure inside the air cleaner, allowing outside air to be taken in. This increases intake efficiency, eliminates the phenomenon of engine stoppage, and improves output. This provides a great advantage in that it allows improvements to be made.

However, when such an anti-water lock valve is installed to take in auxiliary air, outside air is taken in directly, which causes air turbulence in the air cleaner during intake, reducing intake efficiency, and also increases intake noise. This results in problems such as an increase in the noise generated by the noise.

As a countermeasure for solving the above-mentioned noise problem such as the intake noise caused by the outside air intake of auxiliary air or the engine sound exiting to the outside through the outside air intake port, the prior art described in the following publications is known.

Utility Model Application Publication No. 54-27205 Publication Utility Model Application No. 55-177058 Publication Utility Model Application No. 53-8413 [Problems to be solved by the invention] According to each of the above-mentioned prior art, the This has the advantage of reducing the noise level by attenuating intake noise or external engine noise, but on the other hand, the problem here is that first of all, it is necessary to take in the auxiliary air. Due to insufficient consideration of measures to prevent water from entering through the outside air intake, this may result in water entering the air cleaner case from the outside air intake or adhering to the mouth of the outside air intake. Water may freeze in cold regions or during winter, making it impossible to inhale auxiliary air. In addition, the second problem is that insufficient consideration has been given to the location where the outside air inlet for auxiliary air is installed. Problems such as interference between air and air inside the air cleaner occur, resulting in air turbulence, lowering intake efficiency, and making it impossible to achieve a sufficient improvement in engine output.

[Means for solving problems]

The present invention solves the above-mentioned problems when the above-mentioned anti-water lock valve is attached to take in auxiliary air, and is characterized by the following structure as a means for this purpose.

That is, the present invention provides (A) an air intake inlet pipe for air intake protruding outward from one side of the case peripheral wall of an air cleaner body in which a cleaner element is installed; (B) An anti-water lock valve that opens inward when the inside of the air cleaner reaches high negative pressure and closes otherwise is installed on the other side of the case peripheral wall opposite to the side where the inlet pipe is installed. C) A noise-reducing chamber communicating with the above-mentioned valve is provided on the outside of the case circumferential wall at the location where the anti-water lock valve is installed; It is characterized by connecting a suction pipe passage that can communicate with the atmosphere with its tip opening facing in a desired direction.

[Effect]

In such a configuration, when air intake from the inlet pipe becomes impossible or when the amount of air intake is insufficient due to operating conditions, the anti-water system is activated due to the increase in negative pressure inside the air cleaner, as in the past. The lock valve opens and allows outside air to be sucked in. At this time, the outside air is sucked into the air cleaner from the suction pipe passage through the silencing chamber, and the pulsation of the suctioned outside air is attenuated within the silencing chamber, causing the intake noise. Inhalation noise is reduced by muffling the noise.

In this case, the anti-water lock valve, which serves as the outside air intake port for auxiliary air, is installed opposite to the other side of the air cleaner case peripheral wall, opposite to the main air intake inlet pipe installation location. Based on this relationship, the following effects are expected.

First of all, since the air taken into the air cleaner through the inlet pipe and the outside air taken in through the anti-water lock valve are taken in from opposite sides of the air cleaner, the flow of both air is reduced. Mutual interference phenomena are avoided and air turbulence does not occur.

Secondly, there is usually a pressure difference between the installation position of the inlet pipe and the opposite side in the air cleaner, and this pressure difference occurs during sudden acceleration or at high speeds when the air intake is insufficient. This phenomenon becomes more noticeable under operating conditions, and when auxiliary air needs to be taken in, the large pressure difference causes the anti-water lock valve to open and outside air to be taken in. is carried out effectively.

Third, since the anti-water lock valve is opened during sudden acceleration or in high-speed operating ranges, the suction of outside air from the auxiliary air equalizes the internal pressure distribution inside the air cleaner, greatly improving suction efficiency. Ru.

Moreover, since the outside air suction of the auxiliary air is performed through a suction pipe passage of a required length connected to the outside air intake port of the muffling chamber, water may not enter the opening at the end of this suction pipe passage. By communicating with the atmosphere in the desired direction,
When outside air is taken in, water and dust do not enter into the silencing chamber from the outside air intake port through the intake pipe passage, and intrusion prevention is reliably achieved.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes an air cleaner, which has an annular cleaner element 3 housed inside a bowl-shaped cleaner case 2, as seen in known air cleaners, and whose upper opening is covered with a case cover 4. This is what happens.

The cleaner case 2 has an inlet pipe 5 for air intake protruding outward and connected to one side of its peripheral wall, and a branch port 6 that branches near the tip of the inlet pipe 5. is connected to a preheating duct 7 that guides warm air when preheating the intake air, and a switching valve 8 operated by a vacuum motor 9 is provided in the branch part of the branch port 6. , warm air is sucked in from the preheating duct 7 by a switching valve 8. Note that reference numeral 15 is a carburetor connected to the center of the clean side of the air cleaner 1.

The air cleaner 1 described above is provided with an anti-water lock valve 12 on the other side of the peripheral wall of the cleaner case 2, which is opposite to the side where the inlet pipe 5 is provided. is a suction hole 10 opened in the peripheral wall of the case 2.
A flexible valve body 11 is provided, and the valve body 11 opens inward when the inside of the air cleaner 1 reaches a high negative pressure, and closes at other times.

Further, on the outside of the circumferential wall of the case 2 at the position where the anti-water lock valve 12 is disposed, there is a silencing chamber 1 that communicates with each other via the suction hole 10.
4 is provided in the chamber 14, and an outside air inlet 13 is opened in the chamber 14, and the outside air inlet 13 has a required length and its tip opening is oriented in a required direction to communicate with the atmosphere. A possible suction pipe passage 16 is connected. In addition, the above sound deadening chamber 1
4 has a sufficiently large volume for noise reduction relative to the outside air intake port 13.

With this configuration, when the inlet pipe 5 is blocked by water or the like that has entered the inlet pipe and air intake becomes impossible, or the amount of air intake becomes insufficient in the driving range of acceleration and high-speed driving. Due to an increase in the negative pressure inside the air cleaner 1, the anti-water lock valve 1 may
The valve body 11 of No. 2 opens, and outside air enters the suction pipe passage No. 1.
6, the air is sucked into the air cleaner 1 from the suction port 10 via the silencing chamber 14.

At this time, the outside air sucked in through the suction port 10 is diffused within the sound deadening chamber 14 and its pulsation is attenuated, thereby effectively muffling the suction sound and reducing the suction noise.

In addition, in this case, the anti-water lock valve 12 that controls the intake of outside air is located at a position relative to the installation position of the main air intake inlet pipe 5.
Because of the relationship between the air intake pipe 5, which is disposed on the other side of the peripheral wall of the cleaner case 2 on the opposite side, the air taken into the air cleaner through the inlet pipe 5 and the outside air taken in through the anti-water lock valve 12, Since the two air flows are taken in from opposite sides in the air cleaner 1, interference between the two air flows is avoided, and air turbulence in the air cleaner 1 is prevented.

Furthermore, inside the air cleaner 1, a pressure difference normally occurs between the installation position of the inlet pipe 5 and the opposite side, and this pressure difference becomes noticeable during rapid acceleration or when driving at high speeds, when the amount of air intake is insufficient. Therefore, when it is necessary to take in outside air, the large pressure difference causes the anti-water-lock valve 12 to open and outside air is taken in, so that outside air is effectively taken in.

Furthermore, since the anti-water lock valve 12 is opened and outside air is taken in during sudden acceleration or high-speed operating ranges where the pressure difference becomes noticeable, the internal pressure distribution within the air cleaner 1 is also made uniform.

Moreover, the intake of outside air
This is done through a suction pipe passage 16 of a required length connected to the outside air suction port 13 of the
If the air is communicated with the atmosphere in a required direction that prevents water from entering, water and dust will not enter into the silencing chamber 14 from the outside air intake port 13 through the intake pipe passage 16 when outside air is taken in. This ensures that intrusion prevention is achieved.

[Effect of idea]

In the present invention, since the above-described effects can be obtained with the above-described configuration, the anti-water lock valve 12
Intake of auxiliary air, which is the original function of the engine, is performed to improve intake efficiency, and when outside air is taken in, the noise reduction chamber 14 provides a noise reduction effect, reducing intake noise. In addition, the following effects can be obtained.

(1) First, connect the suction pipe passage 16, which has the required length and can communicate with the atmosphere with its tip opening facing the required direction, to the outside air intake port 13 of the noise reduction chamber 14, which constitutes the outside air intake path for auxiliary air. Because of this configuration, it is possible to direct the opening at the tip of the suction pipe passage 16 to the atmosphere in a desired direction where no water or dust can enter. By preventing water and dust from entering, it is possible to reliably prevent the intrusion of water, etc. that would otherwise occur when providing an auxiliary air suction means, and it is possible to reliably prevent functional impairment due to such intrusion.

(2) Also, the anti-water lock valve 12, which constitutes the outside air intake path for auxiliary air, is placed on the other side of the case peripheral wall, opposite to the installation position of the inlet pipe 5, which is the main air intake. Due to the relationship shown in FIG. Since air turbulence does not occur within the air cleaner 1, a decrease in intake efficiency that occurs when auxiliary air is taken in can be avoided.

(3) In addition, by inhaling the auxiliary air as described above from the side opposite to the air intake side from the main inlet pipe 5, the installation position on the inlet pipe side and anti-water lock valve inside the air cleaner can be adjusted. Outside air is sucked in so as to eliminate the pressure difference between the air cleaner and the side installation position, thereby making the internal pressure distribution inside the air cleaner uniform, thereby improving the air intake efficiency.

(4) Furthermore, the pressure difference that occurs inside the air cleaner as described above becomes noticeable during sudden acceleration and high-speed operating conditions when insufficient air intake occurs, so when outside air intake is required, ,
The large pressure difference opens the anti-water lock valve 12 and sucks in outside air, so that outside air can be sucked in effectively, and from this point as well, the intake efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of an air cleaner according to the present invention, and FIG. 2 is a longitudinal sectional view thereof. 1...Air cleaner, 2...Cleaner case,
3...Cleaner element, 4...Case cover, 5...Inlet pipe, 6...Branch port, 7
... Preheating duct, 8 ... Switching valve, 9 ... Vacuum motor, 10 ... Suction hole, 11 ... Valve body,
12...Anti-water lock valve, 13...
Outside air intake port, 14...muffling chamber, 16... suction pipe passage.

Claims (1)

[Scope of Claim for Utility Model Registration] In an air cleaner in which an inlet pipe for air intake is provided protruding outward from one side of a case peripheral wall of an air cleaner body in which a cleaner element is installed, An anti-water lock valve is installed on the other side of the case peripheral wall opposite to the side where the anti-water lock valve is installed, and the anti-water lock valve operates to open inward when the inside of the air cleaner becomes high negative pressure and close otherwise. A silencing chamber is provided on the outside of the case circumferential wall at the position where the silencing valve is installed, and the outside air inlet opening in the silencing chamber has the required length, and the end opening is directed in the required direction to communicate with the atmosphere. An air cleaner characterized by connecting suction pipe passages that can communicate with each other.