JPH07269429A - Air cleaner for vehicle - Google Patents

Abstract

PURPOSE:To prolong the service life of an element of an air cleaner and facilitate maintenance thereof. CONSTITUTION:A short cylindrical cleaner case 2 is arranged on an intake system of an engine, which case 2 has an air inflow port on a peripheral wall 2a and an air outflow port 2c on a bottom wall 2b. A circular element 4 is prepared by folding a filter in a sawtooth form inside the cleaner case 2 to form an air cleaner 9 for a vehicle. A dust collection chamber 10 is projected outward from the peripheral wall 2a of the cleaner case 2. Under the high speed and high load operation of an engine, air including dusts of comparatively large grains suctioned from the air outflow port of the peripheral wall 2a of the cleaner case 2 flows between the peripheral wall 2a of the cleaner case 2 and the element 4 from the air outflow port. The air enters the dust collection chamber 10, and the dusts therein are accumulated inside the chamber. The dusts are prevented from entering the element 4 for improving durability of the element 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air cleaner having a dust collecting chamber provided on a peripheral wall of a cleaner case.

[0002]

2. Description of the Related Art An air cleaner mounted on a vehicle such as an automobile removes dust and the like from the air and supplies clean air to an intake system of an engine. FIG. 5 shows the appearance of the air cleaner 1, and FIG. 6 shows the inside of the air cleaner 1 of FIG. Further, FIG. 7 shows a side surface of the air cleaner 1.

The structure of the air cleaner 1 will be briefly described with reference to this drawing. The air cleaner 1 is roughly composed of a cleaner case 2, a cap 3, and an element 4 provided inside the cleaner case 2.

The cleaner case 2 has a circular shape, and an air inlet 5 is provided at an appropriate position on the peripheral wall portion 2a thereof, and an air inlet pipe 6 is projectingly connected to the air inlet 5. An inlet hose 7 is connected to the air inflow pipe 6.
The end of the inlet hose 7 serves as an air inlet 7a.

The air cleaner 1 includes a cleaner case 2
A distribution plate 8 for distributing the air-fuel mixture to each cylinder of the engine is provided at the air inlet 5 therein.

The element 4 provided inside the cleaner case 2 is formed by folding a filter paper into a sawtooth shape to form a hollow columnar shape. And when the engine is started,
Air is sucked from the suction port 7a by the negative pressure of the engine (see the arrow in FIG. 6), and the sucked air passes through the flow path formed between the inner peripheral wall 2a of the cleaner case 2 and the outer peripheral surface of the element 4. While flowing, it is inhaled by the element 4. The clean air filtered by the element 4 flows into the intake system of the engine, that is, the carburetor and the throttle body.

As the element 4, a wet polyurethane foam, a wet filter paper, a dry filter paper, or a non-woven fabric is usually used. However, in areas with a lot of dust, an oil bath type element in which an oil bath is used in combination with a normally used one or a cyclone type element in which a cyclone is used in combination may be used.

[0008] The oil bath type and cyclone type elements used in such a dusty area have a problem in that the structure is complicated due to an increase in the number of parts. In addition, a passenger car has such a problem due to the layout. There is a problem that is difficult to install. Therefore, even in a dusty area, a normal element is often used.

An air cleaner having a bypass passage is disclosed in Japanese Utility Model Publication No. 1-158585. What is disclosed in this publication is one in which a filter element of an air cleaner is formed by an oil-impregnated main element and a pre-filter, and bypass passages are provided in the upper and lower end plates sandwiching the pre-filter and the main element. Is.

Also, as an air cleaner device, the actual development of Sho 5
Some are disclosed in Japanese Patent Publication No. 9-34061. The one disclosed in this publication is mounted in the casing of the air cleaner with the casing and the axial center aligned with each other, and the air horn of the carburetor provided inside the element is opened at a portion eccentric from the center of the element. It is a thing.

Further, there is an oil bath type air cleaner disclosed in Japanese Utility Model Laid-Open No. 4-137252. The one disclosed in this publication has a foamed sheet provided on the oil tank of the case of the air cleaner over the entire surface of the air passage away from the oil surface.

Further, as a cyclone type pre-air cleaner, there is one disclosed in Japanese Utility Model Laid-Open No. 3-54275. What is disclosed in this publication is one in which a guide member for turning is provided at the inlet of the casing, a central cylinder on which the furnace material is mounted is provided at the outlet, and the central cylinder is connected to the main air cleaner.

[0013]

The conventional technique described above has a problem that when a normal element is used in a dusty area, the element is attacked by dust and the life of the element is significantly shortened. In order to prolong the life of the element, it is necessary to frequently clean the element and the cleaner case, and maintenance thereof is very complicated. Further, when replacing the element, the work is very troublesome as described above.

The air cleaner having the bypass passage disclosed in Japanese Utility Model Publication No. 1-15885 is disadvantageous in terms of cost because the main element of the filter element and the prefilter are oil-impregnated types.

Further, in the air cleaner device disclosed in Japanese Utility Model Laid-Open No. 59-34061, the air horn of the carburetor is opened at a portion decentered from the center of the element, but the opening portion is the nose connecting portion. Since the positions are symmetrical, there is a high possibility that dust will be inhaled.

Further, the oil bath type air cleaner disclosed in Japanese Utility Model Laid-Open No. 4-137252 has a complicated structure similar to the above.

Further, the cyclone type pre-air cleaner disclosed in Japanese Utility Model Laid-Open No. 3-54275 uses a pre-air cleaner connected to the main air cleaner, so that there is a problem that the structure is complicated and large.

The present invention has been made to solve the above-mentioned conventional problems. The dust sucked into the air cleaner together with the air collides with each other in the middle of the air passage of the cleaner case, and the location thereof (A portion in FIG. 6). (Refer to (1)), use this to provide a dust collection chamber at the place where air hits, and to collect dust without letting the element suck it in,
An object of the present invention is to provide an air cleaner for a vehicle, which extends the life of the element and facilitates maintenance work.

[0019]

According to a first aspect of the present invention, an intake system of an engine is provided with an air inflow pipe on a peripheral wall portion thereof.
In a vehicle air cleaner in which a short cylindrical cleaner case having an air outlet is provided in a bottom wall portion, and an annular element formed by folding a filter paper into a sawtooth shape is mounted inside the cleaner case, the cleaner case is provided. It is characterized in that a dust collecting chamber projecting to the outside is formed in the peripheral wall portion of.

According to the second aspect of the invention, the dust collecting chamber formed in the peripheral wall portion of the cleaner case is provided at a symmetrical position in the radial direction of the air inlet of the cleaner case peripheral wall portion to which the air inflow pipe is connected. It is characterized by that.

Further, the invention according to claim 3 is characterized in that the dust collecting chamber formed in the peripheral wall portion of the cleaner case is removable.

The invention according to claim 4 is characterized in that a dust separating plate is provided between the element and the dust collecting chamber provided in the peripheral wall portion of the cleaner case.

[0023]

According to the first aspect of the present invention, since the dust collecting chamber projecting to the outside is formed in the peripheral wall portion of the cleaner case, the cleaner passes through the air inflow pipe when the engine is rotated at high speed or under high load. The air containing dust with relatively large particles sucked into the cleaner case from the air inlet of the peripheral wall of the case flows through the flow path formed between the peripheral wall of the cleaner case and the outer peripheral surface of the element. Enters the dust collection chamber, and only dust accumulates inside the dust collection chamber.

Further, according to the second aspect of the invention, since the dust collecting chamber is provided at a symmetrical position in the radial direction of the air inlet of the peripheral wall portion of the cleaner case, the air containing dust sucked into the cleaner case is not provided. , A flow path that is divided into two directions at the air inlet and is formed between the peripheral wall of the cleaner case and the outer peripheral surface of the element, which has a low resistance, and is installed at a symmetrical position in the radial direction of the air inlet. They will collide at the position of the dust chamber. This makes it possible to deposit the dust contained in the air inside the dust collection chamber.

Further, in the invention according to claim 3, since the dust collecting chamber provided in the peripheral wall portion of the cleaner case is detachably attached, dust is not collected in the clean area on the engine side from the inside of the element during maintenance of the intake system. Can be prevented from entering.

In the invention according to claim 4, since the dust separating plate is provided between the dust collecting chamber and the element, clean air and air containing dust can be separated at the entrance of the dust collecting chamber. It will be possible.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, and the same members as those shown in FIGS. FIG. 1 shows a state where a cap 3 of an air cleaner 9 attached to an intake system of a vehicle is removed, and FIG. 2 is a sectional front view of the air cleaner 9.

The air cleaner 9 is roughly composed of a short cylindrical cleaner case 2, a cap 3 and an annular element 4. An air inlet 5 is provided in the peripheral wall portion 2a of the cleaner case 2, and an air inlet pipe 6 is connected to the air inlet 5. An inlet hose 7 (see FIGS. 5 and 6) is connected to the air inflow pipe 6.

The bottom wall 2b of the cleaner case 2 has an air outlet 2c communicating with the carburetor or the throttle body.
Is provided.

The air inlet 5 in the cleaner case 2
A distribution plate 8 for distributing the air-fuel mixture to each cylinder of the engine is provided in the portion of. The distribution plate 8 is erected so as to face the air inlet 5.

Further, a dust collecting chamber 10 projecting to the outside of the peripheral wall 2a is provided at a symmetrical position in the radial direction of the air inlet 5 of the cleaner case peripheral wall 2a to which the air inflow pipe 6 is connected. If the dust collecting chambers 10 are provided at symmetrical positions in the radial direction in this way, in the case of a cleaner case in which the air outlet 2c is formed at a position apart from the air inlet 5 (see FIG. 1), the dust collecting chamber 10 And the air outlet 2c come close to each other, thereby increasing the negative pressure near the dust collecting chamber 10, and thus increasing the flow velocity in two directions, so that the air can be guided to the dust collecting chamber 10 more effectively. it can.

As shown in FIG. 3, the dust collecting chamber 10 is arranged such that the opening side of the dust collecting chamber 10 (see FIG. 4) faces the opening 11 formed in the peripheral wall portion 2a of the cleaner case 2 so that the dust collecting chamber 10 has the opening side. The support portion 12 is fixed by being attached to a support metal fitting 13 provided on the peripheral wall portion 2a of the cleaner case 2.

By making the support fitting 13 and the support portion 12 detachable in this way, the dust collecting chamber 10 can be removed.
A dust separating plate 14 is provided between the dust collecting chamber 10 and an element 4 described later.

The cleaner case 2 as described above is provided with a hollow cylindrical element 4 formed by folding a filter paper in a sawtooth shape as shown in FIGS. 1 and 2. The inside of the element 4 is a clean area leading from the air outlet 2c to the carburetor on the engine side and the throttle body.

Next, the operation of this embodiment will be described. When the engine operates, the negative pressure of the engine causes the air to be sucked through the air inflow pipe 6 and flow into the cleaner case 2 through the air inflow port 5.

When the air flows into the cleaner case 2, the air is divided into two directions by the distribution plate 8 provided at the air inlet 5. The separated air passes through a flow path having a low resistance between the outer peripheral surface of the element 4 and the inner peripheral wall portion of the cleaner case 2, and is located at a symmetrical position in the radial direction of the air inlet 5, that is, at an intermediate position of the flow. Hit each other.

When the engine speed is high or when the air velocity is high, such as when the engine is under a heavy load, the relatively large particle dust contained in the air is at the place where the air flow collides. Will be deposited on the bottom wall 2b near the. However, since the dust collection chamber 10 is provided at this position, dust accumulates in the dust collection chamber 10.

Further, in this embodiment, since the dust collecting chamber 10 provided on the peripheral wall portion 2a of the cleaner case 2 is detachably attached, the bottom wall portion of the cleaner case 2 is placed from the inside of the element 4 during maintenance of the intake system. It becomes possible to prevent dust from entering the air outlet 2c provided in 2b, that is, the clean area on the engine side.

Further, in this embodiment, since the dust separating plate 14 is provided between the dust collecting chamber 10 and the element 4, this dust separating plate 14
This allows clean air and dust to be separated at the entrance of the dust collection chamber 10.

[0040]

As described above, according to the first and second aspects of the invention, since the dust collecting chamber is formed in the peripheral wall portion of the cleaner case, the dust contained in the cleaner case from the air inlet is included. However, the air flows in the cleaner case in two separate directions and collides with each other at the dust collection chamber. As a result, the dust contained in the air can be deposited inside the dust collection chamber. Therefore, it is possible to prevent dust from flowing into the element, and it is possible to extend the durability of the element.

Further, in the invention according to claim 3, since the dust collecting chamber provided in the peripheral wall portion of the cleaner case is detachably attached, when the intake system is maintained, dust is collected in the clean area on the engine side from the inside of the element. Can be prevented, which also extends the life of the element.

Further, in the invention according to claim 4, since the dust separating plate is provided between the dust collecting chamber and the element, clean air and air containing dust can be separated at the entrance of the dust collecting chamber. it can. This can prolong the life of the element.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of the present invention.

FIG. 2 is a front view of that of FIG.

FIG. 3 is a partially enlarged front view of the air cleaner case showing a state in which the dust collecting chamber is removed from the one shown in FIG.

FIG. 4 is a front view showing the dust collection chamber of FIG.

FIG. 5 is a top view of a conventional vehicle air cleaner.

FIG. 6 is a top view showing a state where the cap of FIG. 5 is opened.

FIG. 7 is a partial cross-sectional front view of that of FIG.

[Explanation of symbols]

 2 Cleaner case 2a Peripheral wall 2b Low wall 2c Air outlet 4 Element 5 Air inlet 6 Air inlet pipe 9 Air cleaner 10 Dust collection chamber 14 Dust separation plate

Claims (4)

[Claims] 1. An intake system of an engine is provided with a short cylindrical cleaner case having an air inlet pipe in a peripheral wall portion and an air outlet port in a bottom wall portion, and a filter paper in a sawtooth shape inside the cleaner case. An air cleaner for a vehicle equipped with an annular element formed by being folded, wherein a dust collecting chamber protruding outward is formed in a peripheral wall portion of the cleaner case. 2. The dust collecting chamber formed in the peripheral wall portion of the cleaner case is provided at a radially symmetrical position of the air inlet of the cleaner case peripheral wall portion to which the air inflow pipe is connected. Vehicle air cleaner. 3. The air cleaner for a vehicle according to claim 1, wherein the dust collecting chamber formed in the peripheral wall portion of the cleaner case is removable. 4. An air cleaner for a vehicle according to claim 1, wherein a dust separating plate is provided between the element and the dust collecting chamber provided in the peripheral wall portion of the cleaner case.