JP2003293873A - Resonator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a size of a Helmholtz resonator integrally formed by blow- molding, and to increase mounting strength of a resonance box. <P>SOLUTION: An intake pipe communicating to an engine, a branched pipe branched from the intake pipe, and the resonance box communicating to the intake pipe through the branched pipe are integrally formed by the blow-molding to constitute a resonator. In the resonator, the resonance box has a branched pipe connecting face for connecting the branched pipe, a periphery of the branched pipe connecting face projects to an intake pipe side with respect to a connecting portion of the branched pipe to constitute a resonance box projecting portion, and the resonance box projecting portion is connected to both of the branched pipe and the intake pipe through an L-shaped flat rib. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a resonator, and more particularly, to downsizing a Helmholtz type resonator integrally formed by blow molding and improving the mounting strength of a resonance box. This is related to the resonator to be operated. 2. Description of the Related Art Some engines mounted on vehicles are equipped with an air cleaner having a resonator. The resonator is a muffler (also called a “resonator”) for reducing a predetermined frequency component of a propagation sound propagating in the intake pipe by applying the Helmholtz resonance principle. As a resonator, Japanese Patent Laid-Open No. 6-1089
There is one disclosed in Japanese Patent Publication No. 41 (JP-A-41). The intake muffler for an internal combustion engine disclosed in this publication is configured such that a resonator provided in an intake system of an automobile engine is formed of a container having an upper surface having a convex curved shape and a lower surface having a concave curved shape,
The resonator is placed above the cylinder head cover of the engine, and the shape of the resonator provided in the intake passage of the automobile engine is improved to increase rigidity with a simple structure. [0004] Another example is disclosed in Japanese Patent Application Laid-Open No. 6-264838. The hose with a resonator disclosed in this publication includes a hose through which gas can pass, and a resonator for reducing a predetermined frequency component of a propagation sound propagating in the hose by a resonance effect, and the hose and the resonator are integrally formed. It is molded to reduce manufacturing costs, prevent the resonator body from coming off the hose, and prevent airtightness from deteriorating. [0005] Furthermore, there is one disclosed in Japanese Patent Application Laid-Open No. 8-309883. The resonator-integrated hose disclosed in this publication includes a hose body having a flat seating surface with a through hole, a container portion, and a communication tube held in the container portion, and an opening in the container portion and one end of the communication tube. The opening consists of a resonator located on the same plane, the open end of one end of the communication tube is welded to the seat around the through hole, and the open end of the container is welded to the seat and integrated with the hose body. Thus, the number of parts and the number of manufacturing steps are reduced, and vibration of the communication pipe itself is prevented. [0006] Furthermore, there is a device disclosed in Japanese Utility Model Laid-Open No. 7-35756. The resonator disclosed in this publication is attached to a branch pipe branched from a gas passage pipe constituting a gas passage, and has a resonance box having an opening into which an end of the branch pipe is inserted, and a resonator provided at an opening of the resonance box. In a resonator provided with an elastic packing for keeping the end of the branch pipe and the opening of the resonance box airtight, the packing extends to the packing in the axial direction of the branch pipe and inward of the resonance box. By forming a pipe part, in a Helmholtz resonance type intake resonator, it is possible to set an arbitrary resonance frequency while using a common resonance box and branch pipe, and to reduce the space required for installation work as much as possible, further mounting Workability has been improved. As shown in FIG. 8, a conventional resonator 124 is attached to an air inlet pipe 108 which constitutes a part of an intake pipe 104 which communicates with an engine (not shown). It is formed integrally by molding. That is, the Helmholtz type resonator 124 includes an air inlet pipe 108 serving as the intake pipe 104 communicating with the engine, a branch pipe 120 branched from the air inlet pipe 108, and an air inlet pipe via the branch pipe 120. And a resonance box 122 having a predetermined capacity communicating with the resonance box 122. At this time, the branch pipe connecting surface connected to the branch pipe 120, that is, the resonance box 1 of the resonator 124
22 is connected to the connecting portion 1 of the branch pipe 120.
The outer peripheral portion is formed on the same surface with respect to
Are arranged so that the resonance box 122 is overlapped. As a result, the resonance box 122 is moved from the center line 108CL of the air inlet pipe 108 as the intake pipe 104.
When the resonator 124 is disposed in the engine room, a required clearance cannot be secured between the resonator 124 and the engine hood, which is disadvantageous in practical use. . Further, since the dimension L1 from the center line 108CL of the air inlet pipe 108, which is the intake pipe 104, to the end of the resonance box 122 is large, the dimension M1 of the discarded portion (see the hatched portion in the drawing) after blow molding. And the ratio of discarded parts to the product is large, the yield is low, the cost is high, and there is a disadvantage that it is economically disadvantageous. Further, since the resonance box 122 having a large capacity is supported by the branch pipe 120 having a small cross section, there is a disadvantage that the strength of the mounting portion may be insufficient. SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an intake pipe communicating with an engine, a branch pipe branched from the intake pipe, and In a resonator in which a resonance box communicating with the intake pipe is integrally formed by blow molding, the resonance box has a branch pipe connection surface for connecting the branch pipe, and the branch pipe connection surface is connected to the branch pipe. The outer peripheral portion of the portion protrudes toward the intake pipe to form a resonance box protrusion, and the resonance box protrusion is connected to both the branch pipe and the intake pipe via an L-shaped planar rib. It is characterized by the following. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reduce the size of the resonator by reducing the capacity of the resonance box by the amount of the resonance box protrusion, and eliminate the concave dead space that existed between the resonance box and the intake pipe by the flat rib,
The mounting strength of the resonance box is improved, and burrs generated during blow molding are easily removed. Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show an embodiment of the present invention. 1 and 3, reference numeral 2 denotes an air cleaner attached to an engine (not shown). This air cleaner 2 is, as shown in FIG.
It is arranged in the middle of the intake pipe 4 communicating with the engine. An air inlet pipe 8 is connected to the air cleaner 2 via a joint 6 and a cool air hose 10 is connected to the air inlet pipe 8.
It is fixed to a vehicle body (not shown) by a cool air hose clamp 12. One end of an air outlet hose 16 is connected to the air cleaner 2 by a first clamp 14, and the other end of the air outlet hose 16 is connected to a throttle body (not shown) by a second clamp 18. ing. The air cleaner 2 is, as shown in FIG.
Upper case 2 to which air outlet hose 16 is connected
-1, a lower case 2-2, an element 2-3 disposed between the upper case 2-1 and the lower case 2-2, and a clamp 2-4 for fixing the upper case 2-1 and the lower case 2-2. And A Helmholtz type having an intake pipe 4 communicating with the engine, for example, a branch pipe 20 branching from the air inlet pipe 8, and a resonance box 22 communicating with the air inlet pipe 8 via the branch pipe 20. Are integrally formed by blow molding. At this time, the resonance box 22 is connected to the branch pipe 2
The branch pipe connecting surface 26 projects from the connecting portion 28 of the branch pipe 20 toward the air inlet pipe 8 which is the intake pipe 4 at its outer peripheral portion. A projecting portion 30 is formed, and the resonance box projecting portion 30 is connected to both the branch pipe 20 and the air inlet pipe 8 as the intake pipe 4 via an L-shaped planar rib 32. More specifically, the branch pipe 20 is in communication with the air inlet pipe 8 so as to protrude rightward in FIG.
8 is formed, and the branch pipe connecting surface 26 of the resonance box 22 is connected to the connection part 28 of the branch pipe 20. At this time, on the branch pipe connecting surface 26 of the resonance box 22, the entire circumference of the outer peripheral portion with respect to the connection part 28 of the branch pipe 20 protrudes to the left side in FIG. The resonance box protrusion 30 is formed. Further, the flat ribs 32 are provided in FIG. 1 and FIG.
As shown in FIG. 2, the resonance box protrusion 30 is formed in an L-shape in order to connect both the branch pipe 20 and the air inlet pipe 8, and the planar rib 32 faces the outer circumference of the branch pipe 20. Are formed at two places. Reference numeral 34 denotes an engine room of a vehicle (not shown), and 36 denotes an engine hood. Next, the operation will be described. When the resonator 24 is blow-molded, as shown in FIG. 2, the capacity of the resonance box 22 is reduced by the amount of the resonance box protrusion 30, and the center line of the air inlet pipe 8 as the intake pipe 4 is reduced. The dimension L2 from 8CL to the end of the resonance box 22 becomes smaller, and the dimension M2 of the discarded portion after blow molding (see the hatched portion in FIG. 2) also becomes smaller. When the air cleaner 2 having the blow molded resonator 24 is disposed in an engine room 34 of a vehicle (not shown), the size of the resonator 24 and the engine hood 36 is reduced as shown in FIG. A clearance C is secured between them. As a result, the outer peripheral portion of the branch pipe connecting surface 26 of the resonance box 22 projects toward the air inlet pipe 8 serving as the intake pipe 4 with respect to the connection portion 28 of the branch pipe 20, thereby forming the resonance box protrusion 30. Due to the formation, the size of the resonator 24 can be reduced by reducing the capacity of the resonance box 22 by the amount of the resonance box protrusion 30, and the waste portion after blow molding (FIG. 2)
The size M2 of the product can be reduced, the ratio of the discarded portion to the product is reduced, the yield is improved, the cost can be reduced, and it is economically advantageous. When the air cleaner 2 including the resonator 24 is disposed in an engine room 34 of a vehicle (not shown),
The clearance C can be secured between the downsized resonator 24 and the engine hood 36. The resonance box protruding portion 30 is connected to both the branch pipe 20 and the air inlet pipe 8 serving as the suction pipe 4 via the L-shaped flat rib 32, so that the resonance box 22 and the suction pipe are connected. Air inlet pipe 8 which is pipe 4
This eliminates the concave dead space that has existed between the resonance box 22 and the space, thus enabling effective use of the space, improving the mounting strength of the resonance box 22, and easily removing burrs generated during blow molding. It can contribute to improvement of workability. It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible. For example, in the embodiment of the present invention, L
Although the U-shaped planar ribs 32 are formed at two locations facing each other on the outer circumference of the branch pipe 20, a special configuration is provided in which four flat ribs 42 are provided at equal circumferential intervals on the outer circumference of the branch pipe 20. Is also possible. That is, as shown in FIG. 5, like the L-shaped planar rib 32 in the embodiment of the present invention, the first
While forming the 2nd plane rib 42-1 and 42-2,
The third and fourth planar ribs 42-3 and 42- are arranged in a state orthogonal to the first and second planar ribs 42-1 and 42-2.
4 is provided. Then, the mounting strength of the resonance box can be further improved, which is practically advantageous. In the embodiment of the present invention, the resonance box 22 of the resonator 24 is connected to the intake pipe 4, for example, the branch pipe 20 branched from the air inlet pipe 8, but the shape of the resonance box 52 is modified. It is also possible to adopt a special configuration for causing the above. That is, as shown in FIG. 6, a resonance box 52 having an arc-shaped cross section of the resonator 24 is formed on the outer peripheral portion of the air inlet pipe 8. Then, the resonance box 52 of the resonator 24 comes into close contact with the outer peripheral shape of the air inlet pipe 8, so that the size of the resonator can be reduced and the mounting strength of the resonance box can be improved. Can be. Further, a special configuration in which the resonance box 62 of the resonator 24 is formed in the air inlet pipe 8 is also possible. That is, as shown in FIG. 7, the air inlet pipe 8 and the resonance box 62 of the resonator 24 are formed in a circular cross section, and this cross section is divided into two sections, and one of the sections is defined as the air inlet pipe 8. , And the other compartment is connected to the resonance box 6 of the resonator 24.
Function as 2. Then, a through hole is formed in the partition wall 64 that separates one section from the other section, and this through hole functions as the branch pipe 66. In this case, the resonance box 62 of the resonator 24 is formed inside the air inlet pipe 8, so that the size of the resonator can be further reduced and the mounting strength of the resonance box must be taken into consideration. Is practically advantageous. As described above in detail, according to the present invention, the intake pipe communicating with the engine, the branch pipe branching from the intake pipe, and the resonance box communicating with the intake pipe via the branch pipe. In a resonator integrally formed by blow molding, the resonance box has a branch pipe connecting surface for connecting the branch pipe, and the outer peripheral portion of the branch pipe connecting surface protrudes toward the intake pipe side with respect to the branch pipe connecting portion. The resonance box protrusion is formed by connecting the resonance box protrusion to both the branch pipe and the intake pipe via the L-shaped flat rib, so that the capacity of the resonance box is reduced by the resonance box protrusion. Thus, the size of the resonator can be reduced. Also,
By connecting the resonance box protrusion to both the branch pipe and the intake pipe via the L-shaped planar rib, the concave dead space existing between the resonance box and the intake pipe is eliminated, Effective use of space can be achieved, the mounting strength of the resonance box can be improved, and burrs generated during blow molding can be easily removed, which can contribute to improvement in workability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an air cleaner having a resonator according to an embodiment of the present invention. FIG. 2 is a schematic explanatory view of a state immediately after blow molding. FIG. 3 is an assembled perspective view of an air cleaner. FIG. 4 is an explanatory diagram showing an on-vehicle state of an air cleaner including a resonator. FIG. 5 is a schematic explanatory view of a rib portion showing another first embodiment of the present invention. FIG. 6 is a schematic perspective view of an air inlet pipe and a resonator part according to another second embodiment of the present invention. FIG. 7 is a schematic sectional explanatory view of an air inlet pipe and a resonator part according to a third embodiment of the present invention. FIG. 8 is a schematic explanatory view showing a state immediately after blow molding showing the prior art of the present invention. [Description of Signs] 2 Air cleaner 4 Intake pipe 8 Air inlet pipe 10 Cool air hose 16 Air outlet hose 20 Branch pipe 22 Resonator box 24 Resonator 26 Branch pipe connection surface 28 Connection part 30 Resonance box protrusion 32 Flat rib 34 Engine room 36 Engine hood

Claims (1)

Claims 1. An intake pipe communicating with an engine, a branch pipe branched from the intake pipe, and a resonance box communicating with the intake pipe via the branch pipe are integrally formed by blow molding. In the resonator, the resonance box has a branch pipe connecting surface for connecting the branch pipe, and the branch pipe connecting surface protrudes an outer peripheral portion toward the intake pipe side with respect to a connection portion of the branch pipe so that resonance occurs. A resonator, wherein a box projection is formed, and the resonance box projection is connected to both the branch pipe and the intake pipe via an L-shaped planar rib.