JPH0248687Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to an engine air cleaner installed in the intake passage.

(Prior Art) An engine air cleaner is used to remove harmful solids floating in air taken into a cylinder, and a structure as shown in FIG. 3 is often used. That is, a cleaner case 1 has an inlet 2 open to the atmosphere and an outlet 3 connected to a carburetor, which are separated by an intermediate plate 7 having a through hole 8, and a filter 4 is housed inside the case on the inlet side. The filter 4 has a cylindrical shape, one end surface of which is closed with a cap-shaped top plate 5, and the other end surface covered with a ring-shaped bottom plate 6.
The ring hole 6a of the bottom plate 6 is opposed to the through hole 8 of the intermediate plate 7. The air introduced into the cleaner case 1 from the inlet 2 passes through the filter 4
It passes through from the outer periphery to the inside, is purified, and is led out to the carburetor through the outlet 3 which opens into the expansion chamber 9 through the through hole 8.

In the above structure, a gasket 10 is interposed between the bottom plate 6 and the upper surface of the intermediate plate 7 to prevent short circuits inside and outside the filter 4. However, this gasket 10 has a flat ring shape with a large contact area and low surface pressure, and since the intermediate plate 7 is molded from synthetic resin, there is a concern that seal leakage may occur due to flatness and rigidity. .

(Problem to be solved by the invention) This invention was made to eliminate the above concerns, and its purpose is to provide an engine air cleaner that has improved sealing performance by increasing the surface pressure of the gasket. do.

[Structure of the idea]

(Means for Solving the Problems) With the above object, the engine air cleaner of this invention is divided into an air cleaner case with an inlet and an outlet on both sides by an intermediate plate with a through hole, and a cap-shaped cap on both end faces. In an air cleaner in which a filter with a top plate and a ring-shaped bottom plate attached is housed in the inlet side of the air cleaner case with the ring hole of the bottom plate facing the through hole of the intermediate plate, the periphery of the ring hole of the bottom plate A recessed circumferential groove is formed on the inner peripheral surface of the filter, and on the other hand,
A ring-shaped rib surrounding the through hole and a plurality of semi-spherical protrusions are formed on the upper surface of the intermediate plate, and the lower surface of the bottom plate is placed on the top surface of the protrusion, and the ring-shaped rib is placed in the circumferential groove. The gasket is pressed against the top surface of the rib.

(Function) With this structure, the circumferential groove can be formed above the lower surface of the filter, and the set position of the filter when engaged with the rib is lowered.

The bottom plate is supported by the top surface of the protrusion, which stabilizes the filter set without being affected by the flatness of the bottom plate or intermediate plate, and the shape of the gasket, which is housed in the circumferential groove, is downsized and simplified. The surface pressure against increases,
Filter purification performance improves by improving sealing performance.

(Example) An embodiment of this invention is shown in FIGS. 1 and 2.

The cleaner case 1 is composed of an upper case 1a, a middle case 1b, and an under case 1c. The middle case 1b has an intermediate plate 7 with a through hole 8, and divides the inside of the case 1 into upper and lower halves. The upper half serves as the air cleaner case body and has an inlet (not shown) opened in the upper case 1a, and the lower half serves as an air chamber functioning as an expansion chamber and distribution chamber, and an outlet 3 opens in the under case 1c.

The filter 4 has a cylindrical shape, and its upper end surface is closed together with the inner hole by a cap-shaped top plate 5.
A ring-shaped bottom plate 6 is attached to the lower end surface. The bottom plate 6 has its ring hole 6a.
A circumferential groove 11 is formed on the inner circumferential edge and is recessed so as to fit into the inner circumferential surface of the filter 4.

On the other hand, a ring-shaped rib 12 is protruded around the through hole 8 on the upper surface of the intermediate plate 7, and a plurality of small hemispherical projections 13 are arranged on a circle concentric with the through hole 8 on the outside thereof. be done.

In this way, the filter 4 is attached to the bottom plate 6.
The ring hole 6a of the intermediate plate 7 is placed in the upper case 1a with the through hole 8 of the intermediate plate 7 facing each other. The bottom plate 6 rides on the top surface of the projection 13, and the top surface of the rib 12 comes into pressure contact with the ring-shaped gasket 14 housed in the circumferential groove 11. A gasket 14 is fitted into the circumferential groove 11 and is in contact with the top surface of the rib 12.

Reference numeral 15 denotes a support stand extending on the intermediate plate 7, and a screw 16 is installed on the top surface of the support stand, and the top plate 5
It passes through the grommet 17 fitted in the center of the upper case 1a and the upper case 1a, projects onto the upper case 1a, and tightens the nut 18. As a result, the upper case 1a and the middle case 1b are joined,
At the same time, the filter 4 is pressed down through the grommet 17, the gasket 14 is compressed by the circumferential groove 11 and the top surface of the rib 12, and the bottom surface of the bottom plate 6 contacts the top of the projection 13. Gasket 14 seals the gap between bottom plate 6 and intermediate plate 7.

Note that 19 is a holder such as a wire mesh attached to the inner peripheral surface of the filter, and 20 is a frame trap.

In this way, since the gasket housed in the circumferential groove of the bottom plate is brought into pressure contact with the top surface of the rib, the width of the gasket can be narrowed and the surface pressure can be increased, improving sealing performance. The circumferential groove can be integrally molded by pressing the bottom plate, the ribs can also be integrally molded from the synthetic resin intermediate plate, and the gasket can be made narrow, which is advantageous in terms of cost. Furthermore, since the bottom plate is received by the disposed hemispherical protrusion, the filter can be set stably without being affected by the flatness of the bottom plate, the intermediate plate, or the filter case.

Furthermore, since the circumferential groove is formed to fit into the inner circumferential surface of the filter, the filter can be set low, which has the effect of downsizing the air cleaner case.

[Effects of the invention] As described above, the engine air cleaner according to this invention is divided into an air cleaner case with an inlet and an outlet on both sides by a perforated intermediate plate, and a cap-shaped top plate and a ring-shaped top plate on both end faces. In an air cleaner in which a filter with a bottom plate attached is housed in the inlet side of the air cleaner case with the ring hole of the bottom plate facing the through hole of the intermediate plate, the inner peripheral surface of the filter is attached to the periphery of the ring hole of the bottom plate. Forms a concave circumferential groove that goes into the
A ring-shaped rib surrounding the through hole and a plurality of semi-spherical protrusions are formed on the upper surface of the intermediate plate, and the lower surface of the bottom plate is placed on the top surface of the protrusion, and the ring-shaped rib is placed in the circumferential groove. The gasket is brought into pressure contact with the top surface of the rib, which increases the surface pressure of the gasket to improve sealing performance, and has the effect of allowing the filter to be set low and stably.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an air cleaner showing an embodiment of this invention, FIG. 2 is a plan view of the area around the through hole of the intermediate plate, and FIG. 3 is a longitudinal sectional view of a conventional air cleaner. 1... Air cleaner case, 2... Inlet, 3... Outlet, 4... Filter, 5...
...Top plate, 6...Bottom plate, 7...
...Intermediate plate, 8...Through hole, 11...Peripheral groove, 1
2...Rib, 13...Protrusion, 14...Gasket.

Claims (1)

[Scope of utility model registration request] An air cleaner case with an inlet and an outlet on both sides is divided by an intermediate plate with a through hole, and a filter with a cap-shaped top plate and a ring-shaped bottom plate attached to both end faces is connected to the ring hole of the bottom plate and above. In an air cleaner that is housed on the inlet side of the air cleaner case with the through hole of the intermediate plate facing each other, a circumferential groove is formed around the ring hole of the bottom plate to fit into the inner circumferential surface of the filter, while a groove is formed on the upper surface of the intermediate plate. Forming a ring-shaped rib surrounding the through hole and multiple hemispherical protrusions arranged around it,
An engine air cleaner characterized in that the lower surface of a bottom plate is placed on the top surface of a protrusion, and a ring-shaped gasket housed in a circumferential groove is pressed against the top surface of the rib.