JPH0318691Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is directed to an air cleaner suitable for small general-purpose engines, and particularly relates to an air cleaner of a type in which a cap is attached to an air cleaner case with an elastic band.

As this type of air cleaner, those shown in FIGS. 1 to 4 have already been proposed. The air cleaner 1 shown in FIG. 1 is disclosed in Japanese Utility Model Application Publication No. 57-148050, and has a cap 5 attached to an air cleaner case 3 containing an element 2 with a band 6. The band 6 is made of, for example, a coil spring, and both ends thereof are hooked onto a retaining ring 7 on the side of the case 3, and the middle portion thereof is fitted into a groove 9 of the cap 5. As shown in FIG. 2, which is a view taken along the - arrow in FIG.
The band 6 is fitted into the hole 9. According to this configuration, even if the angular position of the cap 5 is changed in the direction of the arrow R, the cap 5 can be fixed to the case 3 by fitting the band 6 into another groove 9. Since the position can be changed, the intake port 10 can be opened not only downward, but also upward or sideways.
There is an advantage that the direction of the intake port 10 can be changed depending on the application of the engine. However, according to the conventional example described above, the following problem occurs when the band 6 is attached and detached. In other words, when wearing the band 6
While stretching the case 2 (2 in Figure 1)
The band 6 is moved from the position indicated by the dotted chain line 6') to the position where it fits into the groove 9, but on the way, the band 6 accidentally fits into the upper groove 9a, so it is necessary to remove the band 6 from the groove 9a. The problem is that it takes a lot of time. Moreover, it takes time and effort to remove the band 6 as well. Furthermore, if the number of grooves 9 is increased in order to make it possible to select various directions of the intake port 10, the above-mentioned problem becomes even more pronounced.

In the conventional example shown in FIGS. 3 and 4 (-arrow view in FIG. 3), instead of providing one band fitting groove 9 or one set of band fitting grooves 9 in the cap 5, a large number of holes are provided in the case 3. A rib 11 (band engagement part) is provided, and the rib 1
A retaining ring 7 of a band 6 is selectively attached to the belt 1. Even with this structure, the direction of the intake port 10 can be selected by changing the angular position of the cap 5,
There is a problem in that the provision of a large number of ribs 11 increases the weight and material cost of the case 3, and if the number of ribs 11 is increased to improve the selectivity of the intake port direction, the weight and material cost further increase. .

In order to solve the above-mentioned conventional problems, this invention
A fitting part for positioning the band is provided in the center of the cap, and will be explained next with reference to the drawings.

In FIG. 5, the air cleaner case 3 housing the element 2 is a bowl-shaped synthetic resin molded product, and has a discharge port 16 connected to a carburetor (not shown) in the center of the end wall 15. A pair of ribs 11 (only one rib is shown) are integrally provided on the outer surface of the shaped outer peripheral portion. The rib 11 is provided with a hole through which the retaining ring 7 passes. The retaining ring 7 is, for example, a generally double-wound coil-shaped member, and can be easily attached to and removed from the rib 11 by elastically deforming the retaining ring 7. The cap 5 is also a bowl-shaped synthetic resin molded product, and the stepped opening edge 17 is connected to the case 3.
It fits into the opening edge 18 of the
An intake port 10 is provided at one location on the cylindrical peripheral wall 19. The end wall 14 of the cap 5 is gently swollen (with a large radius of curvature) and has a substantially hemispherical recess 20 in the center. A spherical band positioning member 21 is fitted into the recess 20 . Member 21
is a molded product made of synthetic resin, for example, and is provided with a hole through which the middle portion of the band 6 is passed. The band 6 is, for example, a coil spring, and hooks at both ends are hooked to the retaining ring 7 in an elastically expanded state.

As shown in FIG. 6, which is a view taken from the - arrow in FIG.
0 and the member 21 are fitted on the spherical surfaces, the case 3 remains stable even when the band 6 is attached.
The cap 5 can be rotated in the direction of the arrow R, and the opening direction of the intake port 10 (intake port direction) can be freely adjusted. Of course, no matter how the angular position of the cap 5 is set before attaching the band 6, the member 21
The band 6 can be securely attached by fitting it into the recess 20. The band 6 is attached by moving the band 6 in an extended state, for example, from position 6' on the upper side of the case 3 to the position shown by the solid line, with both ends hooked to the retaining ring 7. Since the recess 20 is provided only in the center of the cap end wall 14, the member 21 will not fit into another recess or groove while the band 6 is being moved as described above. Therefore, the band 6 can be attached extremely easily. Also, after the band is attached, the cap 5 is pressed against the case 3 by the elasticity of the band 6.
The cap 5 is prevented from rotating due to engine vibration or the like. Of course, since the member 21 is fitted into the recess 20, the band 6 is reliably prevented from coming off due to engine vibration or the like.

Next, another embodiment will be described.

FIG. 7A is a front view of the fitting portion, and FIG. 7B is a sectional view taken along line BB in FIG. 7A. In FIG. 7, the fitting member 21a has a regular hexagonal (or other polygonal) front shape, and its bottom portion is in the hexagonal (or polygonal shape corresponding to the member 21a) recess 20a of the cap 5. They are tightly fitted. According to this structure, since the member 21a and the recess 20a are hexagonal, the direction of the intake port can be adjusted in 60° increments.
Furthermore, since the band 6 prevents the rotation of the cap 5 via the member 21a after assembly, it is possible to more reliably prevent the direction of the intake port from becoming erroneous due to engine vibration or the like than in the examples shown in FIGS. 5 and 6.

In the embodiment shown in FIG. 8, for example, the positioning member 21b having a hexagonal front shape is fitted into the hexagonal recess 20b of the cap 5, and the protrusion 25 provided at the bottom of the member 21b is inserted into the hole in the bottom wall of the recess 20b. The projection 25 is fitted with a curvature 26 to prevent it from coming off. Further, the band 6 is fitted into a groove 27 provided on the surface of the member 21b. According to this structure, the member 21b is placed in advance in the recess 20 at a predetermined angular position.
By press-fitting into b, the cap 5 can be attached at a predetermined angular position. Furthermore, by fitting the band 6 into the groove 27, the band 6 will not come off in the assembled state, and rotation of the cap 5 will also be prevented.

In the embodiment of FIG. 9, the cap 5 does not have a recess, but only a hole 29. The positioning member 21c is seated on the periphery of the hole 29, with the protrusion 25c fitted into the hole 29 and fixed by the turn 26c. The protrusion 25c has a hexagonal or other polygonal cross-sectional shape, and is fitted into the hole 29 in a non-rotatable manner. With this structure as well, the same effects as in the case of FIG. 8 can be obtained.

In the embodiment shown in FIG. 10, the opening edge 18 of the case 3
A large number of recesses 30 are provided at intervals in the circumferential direction, for example, in a sawtooth shape, and the opening edge 17 of the cap 5
A protrusion 31 that fits into the recess 30 is provided at one or more locations. According to this structure, the recess 30
Since rotation of the cap 5 is prevented by the fitting of the convex portion 31 with the convex portion 31, the opening direction of the intake port 10 can be prevented more reliably than in the examples shown in FIGS. 5 and 6. 31 into another recess 30, the angular position of the cap 5 can be adjusted.

Instead of the concave portion 30 and convex portion 31 in FIG. 10, the cap circumferential wall 19 and the case circumferential wall 2 are replaced as shown in FIG.
2 may be octagonal or other polygonal, thereby preventing rotation of the cap 5 and allowing accurate adjustment of the direction of the intake port.

The protrusion 25c having a hexagonal cross section in FIG. 9 can be changed to a circular cross section as in the protrusion 25d in FIG.
In this way, the cap 5 and the member 21d can be rotated freely relative to each other. Further, if it is desired to prevent rotation, the member 21d can be fixed to the cap 5 with an adhesive.

When the band 6 is a coil spring as shown in FIG. 13, the spring has a partially large diameter spherical portion 2.
1e, and this part 21e is the member 2 in FIG.
It can also be fitted into the recess 20 instead of 1.

The band 6a may be made of rubber as shown in FIG. 14, and in that case, the spherical positioning portion 21f that fits into the recess 20 can be molded integrally with the band 6a.

As shown in FIG. 15, a positioning portion 21g having a polygonal cross section may be integrally provided on the rubber band 6a.

As explained above, according to the present invention, in the air cleaner 1 that holds the cap 5 on the air cleaner case 3 with the elastic band 6, the fitting part (the recess shown in FIG. 5) that positions the band 6 in the center of the cap 5 20, etc.), even if the angular position of the cap 5 is changed, the band 6 can be reliably positioned at the center of the cap 5. Specifically, the following effects can be obtained. .

(a) Since various air cleaners 1 with different intake port directions can be manufactured using one type of air cleaner case 3 and cap 5, costs can be reduced by reducing mold costs.

(b) Since it is possible to arrange the intake port 10 at an optimal position depending on the application and usage conditions of the engine, the performance and durability of the engine can be improved.

(c) This prevents the band 6 from accidentally fitting into another groove or recess when attaching or detaching the band 6.
The band 6 can be attached and detached more easily than the conventional example shown in the figure.

(d) Since it is not necessary to provide a large number of ribs 11 as in the conventional example shown in FIGS. 3 and 4, an increase in weight and material cost can be prevented.

(e) Also, as shown in claim (2), FIG.
As shown in FIGS. 6 and 13, if the mounting direction of the cap 5 is configured to be steplessly adjustable with respect to the air cleaner case 3, the opening direction of the intake port 10 can be adjusted extremely easily, and the band The opening direction of the air cleaner case can be easily adjusted even when the air cleaner case 6 is attached.

(f) Also, as shown in claim (3), FIG.
As shown in FIGS. 8, 9, 10, 11, and 15, if the installation direction of the cap 5 is adjustable in stages with respect to the air cleaner case 3, the direction of the intake port 10 can be adjusted in stages. It is possible to more reliably prevent this from going out of order due to vibrations, etc.

In other words, the configuration in which the mounting direction of the cap 5 with respect to the air cleaner case 3 as shown in claim (2) can be adjusted steplessly is for the case where the cap 5 is installed in a specification with relatively little engine vibration. The configuration in which the adjustment is made in stages as shown in claim (3) is suitable for use with engine specifications where the engine vibration is relatively large and the direction of the intake port is likely to be erroneous. It was devised to ensure that the intake port can be latched securely to prevent it from getting oriented in the wrong direction.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional example, Fig. 2 is a - arrow view of Fig. 1, Fig. 3 is a partially cutaway side view of another conventional example, and Fig. 4 is a Fig. 3 Fig. 5 is a partially cutaway side view of the embodiment of the present invention;
FIG. 6 is a view taken along the - arrow in FIG. 5, and FIGS. 7 to 9, and FIGS. FIG. 10 is a partially cutaway side view of an air cleaner according to yet another embodiment, FIG. 11 is a front view of yet another embodiment, and FIG.
The figure is a partially cutaway side view of yet another embodiment.
1... Air cleaner, 3... Air cleaner case, 5... Cap, 6... Band, 20, 21
...Recessed part and positioning member (fitting part).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an air cleaner in which the mounting direction of the cap to the air cleaner case is adjustable and the cap is held in the air cleaner case with the above mounting direction unchanged by an elastic band, the center of the cap is An air cleaner characterized in that the band is provided with a fitting portion, and the band is provided with a positioning member that fits into the fitting portion to position the band. (2) The air cleaner according to claim 1, wherein the mounting direction of the cap with respect to the air cleaner case can be adjusted steplessly. (3) The air cleaner according to claim 1, wherein the mounting direction of the cap relative to the air cleaner case can be adjusted in stages.