JPH0738689Y2 - Engine air cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air cleaner for an engine mounted on a motorcycle or the like.

[Prior Art] For engines mounted on motorcycles, etc., a carburetor is connected to the intake port of the engine, an air cleaner is connected to the carburetor, and dust is removed with the air cleaner to supply fuel to the intake air. It is atomized and mixed into the engine and then inhaled. The air cleaner is equipped with a filter around the outlet of the cleaner case so that the intake air after removing dust with the filter flows to the outlet.

Generally, the cleaner case is made of synthetic resin by blow molding. Blow molding using a synthetic resin has the advantages that the material cost and the processing cost are both low and that it can be produced at low cost.

However, blow molding has disadvantages such as uneven thickness and poor planar accuracy. For this reason, the outlet tube connected to the outlet of the cleaner case is fastened with a large number of bolts and rivets at short intervals to maintain airtightness. See, for example, Japanese Utility Model Publication No. 62-160767.

[Problems to be solved by the invention] The cleaner case is made of synthetic resin by blow molding.
Even if it can be made at a low cost, there is a problem that the airtightness between the cleaner case and the filter base is low because the flatness of the cleaner case is poor due to the blow molding as described above.

The present invention has been made to solve the above problems, and provides an engine air cleaner that can maintain high airtightness with a filter base even with a cleaner case with low accuracy. It is an issue.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a tubular portion, a mounting flange portion protruding from the outer periphery of the tubular portion, and a plurality of mounting flanges provided at the inner end of the tubular portion. A filter base having a leg part integrally molded with a hard synthetic resin, a filter holder provided with a filter fixed to the leg part of the filter base, and a composite in which a plurality of places are fixed to the mounting flange part of the filter base with screws. In an engine air cleaner consisting of a resin blow molding cleaner case and an outlet tube band-tightened to the tubular portion of the filter base, in the circumferential direction at the joint with the cleaner case of the mounting flange portion of the filter base. The seal ring made of an elastic material, which has a plurality of annular protrusions on both sides, is formed in the groove in the circumferential direction. An air cleaner for an engine, characterized in that the filter base and the cleaner case are fitted in a state in which they are in contact with the inner surface of the groove of the mounting flange portion and the surface of the cleaner case facing the groove, and the filter base and the cleaner case are fastened with screws. Have a configuration.

[Operation] The cleaner case is formed by blow molding with synthetic resin, and the accuracy of the wall thickness and flatness is inferior. However, according to the present invention,
A circumferential groove is formed at the joint of the mounting flange of the filter base with the cleaner case, and an elastic material seal ring having a plurality of annular projections on both sides is provided in the circumferential groove.
Since the protrusions are fitted to the inner surface of the groove of the mounting flange portion and the surface of the cleaner case in contact with the groove, and the filter base and the cleaner case are screwed and fastened, the seal ring is As a result of elastic deformation, the elastic force causes one side of the annular projection to come into close contact with the inner surface of the filter base groove and the other annular projection to come into close contact with the surface of the cleaner case facing the groove. Therefore, due to the elasticity of the seal ring, the filter base and the cleaner case can be connected to each other while maintaining high airtightness.

Further, since the seal ring is fitted in the circumferential groove of the joint portion of the filter base, the movement of the seal ring is restricted by the groove during the assembling of the filter base, and the seal ring does not fall off.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 are explanatory views of an air cleaner for an engine of a motorcycle or the like according to this embodiment. FIG. 1 is a vertical sectional view of the air cleaner case, and FIG. 2 is an enlarged cross section of a seal ring. Fig. 3 is a plan view of the air cleaner case with the filter removed, Fig. 4 is a vertical cross-sectional perspective view of the air cleaner case, and Fig. 5 is a side view in which the upper portion of the air cleaner case is cut away. FIG. 6 is an overall side view of the air cleaner case including the engine.

The air cleaner of the embodiment mainly includes a cleaner case 1, a filter base 5, and a filter holder 10.
And an outlet tube 13.

The filter base 5 includes a tubular portion 5a, a mounting flange portion 5b protruding from the outer periphery of the tubular portion 5a, and a plurality of legs 5c provided at the inner end of the tubular portion 5a, which are integrally formed of a hard synthetic resin. It is formed by molding and has high accuracy.

The filter holder 10 includes the filter 9 fixed to the leg portion 5c of the filter base 5.

The cleaner case 1 is made of blow molding of synthetic resin in which a plurality of places are fixed to the mounting flange portion 5b of the filter base 5 with screws, and the front surface (toward the front side of the vehicle body) where intake air is emitted toward the engine 15 side. The surface) is provided with a large outlet hole 2. Also, on the upper surface of the cleaner case 1,
The lid plate 4 to which the suction hole 3 is attached is detachably attached.

A circumferential groove 6 is formed in a joint portion 5b1 of the mounting flange portion 5b of the filter base 5 with the cleaner case 1. An elastic seal ring 7 having a plurality of annular projections 8 on both sides is inserted and fitted into the circumferential groove 6. The seal ring 7 has a large elasticity.

The filter base 5 is fitted into the outlet hole 2 of the cleaner case 1, the seal ring 7 is pressed against the cleaner case 1, and the projections 8 are respectively formed on the inner surface of the groove 6 of the mounting flange portion 5b and the groove 6 of the cleaner case 1. Surface facing
The filter base 5 and the cleaner case 1 are fitted in a state of abutting against the la 1a, and the filter base 5 and the cleaner case 1 are fastened with screws at a plurality of positions so that the filter base 5 does not separate from the cleaner case 1.

The filter 9 is attached to the filter holder 10, is inserted from the inside of the cleaner case 1, is pressed around the circumference of the outlet hole 2, and is centered at the merging portion 5c1 where the respective leg portions 5c of the filter base 5 merge. Tighten with screws 11.

The end of the outlet tube 13 is inserted into the tubular portion 5a of the filter base 5 and band-tightened.

The tip of the outlet tube 13 is connected to the carburetor 14, and the carburetor 14 is connected to the end of the intake hole 16 of the engine 15.

According to the embodiment, the seal ring 7 is elastically deformed when the filter base 5 and the cleaner case 1 are screwed and fastened, and the annular projection 8 on one surface comes into close contact with the inner surface of the groove 6 of the filter base. And a surface of the other side (other surface) of the annular projection 8 that faces the groove 6 of the cleaner case 1.
Stick to 1a. Therefore, the airtightness can be increased and the connection can be made.

Further, the cleaner case 1 can be manufactured at low cost by blow molding, and at the same time, between the cleaner case 1 and the filter base 5, a seal ring 7 having ridges 8 on both sides is provided.
Ensures airtightness and can be easily assembled.

Further, the filter base 5 has a mounting flange portion 5b.
Since the seal ring 7 is fitted in the groove 6 in the circumferential direction of the coupling portion 5b1 of the above, the movement of the seal ring 7 is restricted by the groove 6 when the filter base is assembled, and the seal ring 7 is prevented from falling off. Easy and workable.

[Effects of the Invention] As described above, according to the present invention, the seal ring made of an elastic material, which has a plurality of annular projections on both sides, is interposed between the filter base and the cleaner case. Due to the elasticity, the annular projection is elastically deformed, and one side of the annular special note is brought into close contact with the inner surface of the groove of the filter base and the surface of the cleaner case facing the groove. Therefore, the airtightness between the filter base and the blow-molded cleaner case having low plane accuracy can be maintained and connected.

Further, since the seal ring is fitted into the groove in the circumferential direction of the joint portion of the filter base, the movement of the seal ring is not restricted by the groove when the filter base is assembled, and the seal ring is prevented from falling off. Easy and workable.

[Brief description of drawings]

1 to 6 are explanatory views of an engine air cleaner according to an embodiment of the present invention. FIG. 1 is a vertical sectional view of the air cleaner, and FIG. 2 is a seal ring provided in the air cleaner. FIG. 3 is an enlarged cross-sectional view of FIG. 3, FIG. 3 is a plan view of the air cleaner with the filter removed, FIG. 4 is a perspective view of a vertical cross section of the air cleaner, and FIG. FIG. 6 is an overall side view of the air cleaner including the engine. 1 ... Cleaner case, 1a ... Surface, 5 ... Filter base, 5a ... Cylindrical part, 5b ... Mounting flange part, 5c ... Leg part, 6
… Groove, 7… Seal ring, 8… Annular ridge, 10… Filter holder

Claims (1)

[Scope of utility model registration request] 1. A filter base formed by integrally molding a tubular portion, a mounting flange portion projecting from the outer periphery of the tubular portion, and a plurality of legs provided at the inner end of the tubular portion with a hard synthetic resin. A filter holder provided with a filter fixed to the leg portion of the filter base, a blower cleaner case made of synthetic resin in which a plurality of places are fixed to the mounting flange portion of the filter base with screws, and the filter base tube. In an engine air cleaner consisting of an outlet tube that is band-tightened to a belt-shaped part, a circumferential groove is formed in the joint of the mounting flange of the filter base with the cleaner case, and a plurality of annular ridges are formed on both sides. The provided elastic seal ring is provided in the groove in the circumferential direction, and the protrusion is attached to the inner surface of the groove of the mounting flange portion and the cleaner case. An air cleaner for an engine, characterized in that the filter base and the cleaner case are fitted in a state of abutting on a surface facing the groove, and the filter base and the cleaner case are fastened with screws.