EP1132611A1 - Resonator type silencer for automotive engine - Google Patents
Resonator type silencer for automotive engine Download PDFInfo
- Publication number
- EP1132611A1 EP1132611A1 EP00105114A EP00105114A EP1132611A1 EP 1132611 A1 EP1132611 A1 EP 1132611A1 EP 00105114 A EP00105114 A EP 00105114A EP 00105114 A EP00105114 A EP 00105114A EP 1132611 A1 EP1132611 A1 EP 1132611A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- case
- edge portion
- section
- resonator type
- open end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003584 silencer Effects 0.000 title claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005304 joining Methods 0.000 description 6
- 230000001629 suppression Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/0201—Housings; Casings; Frame constructions; Lids; Manufacturing or assembling thereof
- F02M35/0202—Manufacturing or assembling; Materials for air cleaner housings
- F02M35/0203—Manufacturing or assembling; Materials for air cleaner housings by using clamps, catches, locks or the like, e.g. for disposable plug-in filter cartridges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1283—Manufacturing or assembly; Connectors; Fixations
Definitions
- This invention relates to improvements in a resonator type silencer which is connected to an air intake duct of an internal combustion engine of an automotive vehicle in order to suppress vibration of intake air to be supplied to the engine.
- a generally box-shaped resonator type silencer having a certain volume is disposed to be connected to an air intake duct of an automotive internal combustion engine.
- the resonator type silencer functions to suppress vibration of intake air by causing air inside the resonator type silencer to make resonance with the intake air vibration.
- Such a resonator type silencer is usually formed of plastic and is a large-sized part.
- the resonator type silencer includes upper and lower cases which are independently fabricated. The upper and lower cases are joined to each other to form the resonator type silencer, in such a manner that the open end sections of them are thermally welded or welded upon vibration under a state where the open end sections are brought into contact with each other. Otherwise, the open end sections of the upper and lower cases may be joined by means of clips, screws or the like.
- Such a technique is disclosed in Japanese Utility Model Provisional Publication No. 6-60764.
- Another object of the present invention is to provide an improved resonator type silencer for an automotive internal combustion engine, which is high in suppression effect for intake air vibration in an air intake duct of the engine while lowering a production cost of the resonator type silencer.
- a further object of the present invention is to provide an improved resonator type silencer for an automotive internal combustion engine, by which upper and lower cases constituting the resonator type silencer can be readily joined to each other maintaining a tight seal condition of the resonator type silencer, without using any facility or members for connecting the upper and lower cases.
- a resonator type silencer comprises a first case having an open end section.
- a second case is fabricated separate from the first case.
- the second case has an open end section which is joinable with the open end section of the first case.
- the open end section of the first case includes an end edge portion having a linear projection extending along the end edge portion.
- the linear projection has an inclined face extending along the end edge portion and sloped down in a direction toward a surface of the open end section.
- the open end section of the second case includes an end wall portion.
- a guide wall is integral with the end wall portion and extending along an end edge portion of the open end section to define a groove extending along the end edge portion.
- a seal edge portion is formed at a surface of at least one of the guide wall and the end wall portion and extends along the end edge portion of the open end section of the second case to define a part of the groove.
- the seal edge portion is contactable with the inclined face of the linear projection of the end edge portion of the first case.
- an engagement mechanism is further provided in the resonator type silencer and includes a projecting section formed integral with one of the first and second cases.
- a receiving section is provided for receiving the projecting section so that the projecting section and the receiving section are engageable with each other, the receiving section being formed integral with the other of the first and second cases.
- the thus arranged resonator type silencer can be readily assembled by bringing the open end sections of the upper and lower cases into contact with each other in a manner to insert the linear projection of one case into the groove formed in the other case, then by engaging the engagement mechanism formed between the upper and lower cases.
- This makes it unnecessary to use a large-sized facility or separate members for joining the lower and upper cases, greatly facilitating production of the resonator type silencer.
- a labyrinth structure formed by the linear projection and the groove is provided between the open end sections of the lower and upper cases, while an edge contact is made between the seal edge portion and the inclined face of the linear projection.
- an air-tight seal can be securely maintained between the open end sections of the lower and upper cases.
- the resonator type silencer S is connected to an air intake duct of an internal combustion engine of an automotive vehicle, though not shown.
- the air intake duct forms part of an intake system of the engine.
- the resonator type silencer S is provided with a connection duct 1 through which the inside of the resonator type silencer S is communicated with the air intake duct through which intake air flows into the engine.
- the resonator type silencer S comprises a lower case 2 which is formed generally cup-shaped and has a generally rectangular cross-section in a plane perpendicular to the longitudinal axis of the lower case.
- the lower case 2 is relatively deep or large in axial length.
- An upper case 3 is joined at its lower end part with the lower case 2 at an upper end part, maintaining a tightly closed state.
- the upper case 3 is formed generally cup-shaped and has a generally rectangular cross-section in a plane perpendicular to the axis of the upper case 3.
- the upper case 2 is relatively shallow or small in axial length.
- the connection duct 1 is formed integral with the upper case 3 and extends from an upper wall 3p of the upper case 3.
- the lower case 2 is integrally provided at its outer surface with engagement projections 4, 4 through which the lower case 2 is fastened to a vehicle body of the automotive vehicle.
- Each of the lower and upper cases 2, 3 is formed of plastic such as thermoplastic resin. Examples of the thermoplastic resin are polyethylene, and polyamide. Such thermoplastic resin may contain filler.
- the whole body of the resonator type silencer S is formed generally box-shaped so as to have a certain volume.
- the lower case 2 includes an open end section 2a located at the upper end part thereof and peripherally formed endless.
- the open end section 2a includes an end edge portion P1 which laterally extends endless.
- a linear projection 5 forms part of the end edge portion P1 and extends along the periphery of the lower case 2.
- the projection 5 has an inclined face 6 which extends along the periphery of the lower case 2 and sloped down in a direction from the inner surface to outer surface of the open end section 2a.
- a plurality of hook-like guide walls 7 are formed integral with the open end section 2a and projected from the surface of a end wall portion P2 of the open end section 2a.
- Each hook-like guide wall 7 laterally extends along the end edge portion P1 and has a generally L-shaped cross-section.
- the hook-like guide wall 7 includes an outward projecting portion 7a which is integral at its base part with the end wall portion P2 of the lower case 2. The outward projecting portion 7a laterally extends along the end edge.
- An upward projecting portion 7b is integral at its lower part with an tip end part of the outward projecting portion 7a, so that a groove G1 extending along the end edge portion P1 is formed between the outer surface of the end wall portion P2 and the upwardly projecting portion 7b.
- the adjacent hook-like guide walls 7, 7 are formed laterally aligned and separate from each other.
- a plurality of generally wedge-shaped stopper projections or projecting sections 9 are integrally formed at the outer surface of the open end section 2a of the main body 2A of the lower case 2.
- Each stopper projection 9 is located between the adjacent hook-like guide walls 7, 7.
- Each stopper projection 9 forms part of an engagement mechanism (not identified) has an inclined face 8 which is sloped down in a direction toward the end edge portion P1.
- the upper case 3 includes an open end section 3a located at the lower end part of the upper case 3 and peripherally extents endless.
- the open end section 3a includes an end edge portion E1 which extends endless to extend along the periphery of the upper case 3.
- a laterally extending hook-like guide wall 10 is formed integral with an end wall portion E2 of the open end section 3a and projected from the surface of the end wall portion E2.
- the hook-like guide wall 10 peripherally extends along the end edge portion E1 and has a generally L-shaped cross-section. More specifically, the hook-like guide wall 10 includes an outward projecting portion 10a which is integral at its base part with the end wall portion E2 of the upper case 3.
- the outward projecting portion 10a peripherally extends along the end edge portion E1.
- a downward projecting portion 10b is integral at its upper part with an tip end part of the outward projecting portion 10a, so that a groove G2 extending along the end edge portion E1 is peripherally formed between the outer surface of the end wall portion E2 and the downward projecting portion 10b.
- a peripherally extending seal edge portion 11 is formed at the inner surface of the hook-like guide wall 10. More specifically, the seal edge portion 11 is located to extend along a linear portion (not identified) at which the outward projecting portion 10a and the downwardly projecting portion 10b is integral with each other, so that the seal edge portion 11 can be brought into contact with the inclined face 6 of the linear projection 5 of the lower case 2 when the linear projection 5 is inserted into the groove G2 of the upper case 3.
- a plurality of tongue-like locking piece or receiving sections 12 are formed integral with the open end section 3a and project downward from the open end section 3a by a certain length.
- Each locking piece section 12 forms part of a locking or engagement mechanism (not identified) is located corresponding to each stopper projection 9 of the lower case 2.
- Each locking piece section 12 is formed with a window or opening into which the stopper projection 9 can be fitted.
- a plurality of ribs 14 are formed integral with the open end section 3a of the upper case 3 at the inner surface so as to function to reinforce the wall of the end wall portion E2 defining the groove G2.
- Each rib 14 is plate-like and perpendicular to the inner surface of a main body 3A of the upper case 3.
- Each rib 14 is integral with the end edge portion E1 and extends inward as best shown in Fig. 4.
- Each rib 14 further extends downward from the end wall portion E2 by a certain length so as to form a downward projecting part 14a.
- the downward projecting part 14a has a base section whose edge is formed flush with the outer surface of the end wall portion E2, so that the edge of the base section is brought into contact with the inner surface of the open end section 2a of the lower case 2.
- the above resonator type silencer S is assembled as follows: First, as shown in Figs. 1 and 2, the open end sections 2a, 3a of lower and upper cases 2, 3 are placed opposite each other and then approached to each other. At this time, the downward projecting part 14a of each rib 14 of the upper case 3 is brought into slidable contact with the inner surface of the open end section 2a of the lower case 2, so that the open end sections 2a, 3a of the lower and upper cases 2, 3 are guided to be accurately positioned. Then, under this state, the open end sections 2a, 3a of the lower and upper cases 2, 3 are further close to each other.
- the tip end part of the linear projection 5 of the lower case 2 is inserted into the groove G2 of the upper case 3, while the locking piece section 12 runs on the inclined face 8 of the stopper projection 9 of the lower case 2 upon elastically deforming.
- the seal edge portion 11 formed at the inner surface of the hook-like guide wall 10 of the upper case 3 is brought into tight contact with the inclined face 6 of the linear projection 5 of the lower case 2, while the stopper projection 9 of the upper case 3 is fitted into the window 13 of the locking piece section 12 so as to restrict displacement of the lower and upper cases 2, 3 in a direction far from each other.
- the downward projecting portion 10b of the guide wall 10 of the upper case 3 is fitted into the groove G1 formed by the hook-like guide wall 7 of the lower case 2. Additionally, the inner surface of the end edge portion P1 of the lower case 2 is brought into tight contact with the outer surface of the end wall portion E2 of the upper case 3.
- a so-called labyrinth structure is formed between the open end sections 2a, 3a of the upper and lower cases 2, 3, more specifically by the end wall portion E2 of the upper case 3 fittingly inserted into the groove G2 of the upper case 3 and the downward projecting portion 10b of the upper case guide wall 10 fittingly inserted into the groove G1 of the lower case 2.
- joining the lower and upper cases 2, 3 can be accomplished to assemble the resonator type silencer S only by pushing down the upper case 3 onto the lower case 2 in a direction where the open end sections 3a, 2a of them approach, allowing the locking piece section 12 to come into engagement with the stopper projection 9. Accordingly, an assembly operation of the resonator type silencer S is largely facilitated. Besides, a special facility for the assembly operation and parts for the joining are not required, thereby making it possible to produce the resonator type silencer S at a low cost.
- Each rib 14 formed at the inner surface of the upper case 3 can not only sustain a reaction force for sealing between the seal edge portion 11 of the upper case 3 and the linear projection 5 of the lower case 2, but also serve as a guide for assembling the upper case 3 to the lower case 2 during assembly of the resonator type silencer S since the lower part of the rib 14 extends downward so as to be flush with the inner surface of the end wall portion E2 of the open end section 3a of the lower case 3. Accordingly, this resonator type silencer S omits providing an independent guide required for assembling the upper and lower cases, thereby reducing the amount of the material for the resonator type silencer thus accomplishing weight-lightening of the resonator type silencer S.
- Figs. 6 and 7 illustrate an essential part of a second embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment except for the shape of the seal edge portion 11 and a rib 15 formed in the lower case 2.
- the seal edge portion 11 has a thin edge-like tip end part 16 which can be brought into tight contact with the inclined face 6 of the linear projection 5 of the rear case 2 in a manner to deform as shown in Fig. 7 when the lower and upper cases 2, 3 are assembled into the resonator type silencer S.
- the rib 15 is formed at the inner surface of a main body 2A of the lower case 2 and extends upward to the open end section 2a.
- the rib 15 is perpendicular to the wall of the main body 2A.
- the rib 15 has an upper end edge 15a which is located to come into contact with the lower end edge of the end edge portion E1 of the upper case 3 as shown in Fig. 7 when the lower and upper cases 2, 3 are assembled, thereby preventing an excessive load from being applied to the edge-like tip end part 16 of the seal edge portion 11 of the upper case 3.
- the edge-like tip end part 16 of the seal edge portion 11 is brought into contact with the inclined face 6 of the linear projection 5 in the open end section 2a of the lower case 2. Accordingly, an air-tight condition can be securely maintained between the lower and upper cases 2, 3 even if a production error or the like is made in the lower and upper cases 2, 3. Furthermore, the rib 15 can prevent an excessive load from being applied onto the edge-like end part 16 of the seal edge portion 11. This effectively protects the seal-edge portion 11 from deterioration and therefore protects the whole resonator type silencer S from being degraded in air-tight sealing ability.
- Figs. 8 and 9 illiterate an essential part of a third embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment except for the shape of the linear projection 5 of the lower case 2 and the cross-sectional shape of the upper part of the groove G2 formed in the upper case 3. More specifically, in this embodiment, the linear projection 5 in the end edge portion P1 of the lower case 2 has two opposite inclined faces 6 and 6A which are formed generally symmetrical, in which the inclined face 6A is sloped down in a direction toward the inner surface of the end wall portion P2.
- seal edge portion 11A is formed at a linear portion (not identified) where the outward projecting portion 10a of the guide wall 10 is integral with the end edge portion E1 of the upper case 3.
- the seal edge portions 11, 11A can be respectively brought into tight contact with the inclined faces 6, 6A of the end edge portion P1 of the lower case 2.
- Figs. 10 and 11 illustrate an essential part of a fourth embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment with the exception that a linear projection 17 having a semicircular cross-sectional shape is formed at the inner surface of the end wall portion P2 in the open end section 2a of the lower case 2.
- the open end sections of the upper and lower cases are brought into alignment with and contact with each other. Then, the linear projection of one case is inserted into the groove formed in the other case, in which the inclined face of the linear projection comes into tight contact with the seal edge portion formed in the groove, thereby accomplishing a tight seal between the upper and lower cases.
- the upper and lower cases can be readily joined with each other maintaining a tight seal condition, thereby making it unnecessary to use a large-scale facility only for joining the cases or separate parts for joining the cases. This lowers production cost for the resonator type silencer as compared with conventional techniques.
- the labyrinth structure is formed between the linear projection and the groove while an edge contact is formed between the seal edge portion and the inclined face of the linear projection.
- This provides a secure air-tight seal between the upper and lower cases, thus stably obtaining the suppression effect on the intake air vibration.
- sealing with the seal edge portion is effectively accomplished by causing the seal edge portion to contact with the inclined face formed on the linear projection, and therefore the air-tight seal can be securely maintained between the upper and lower cases upon the seal edge portion slidably displacing on the inclined face of the linear projection during assembly of the upper and lower cases even if a slight production error is made in the upper and/or lower cases. This reduces irregularity in vibration suppression effect among many products.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
- This invention relates to improvements in a resonator type silencer which is connected to an air intake duct of an internal combustion engine of an automotive vehicle in order to suppress vibration of intake air to be supplied to the engine.
- It is well known that a generally box-shaped resonator type silencer having a certain volume is disposed to be connected to an air intake duct of an automotive internal combustion engine. The resonator type silencer functions to suppress vibration of intake air by causing air inside the resonator type silencer to make resonance with the intake air vibration. Such a resonator type silencer is usually formed of plastic and is a large-sized part. Accordingly, the resonator type silencer includes upper and lower cases which are independently fabricated. The upper and lower cases are joined to each other to form the resonator type silencer, in such a manner that the open end sections of them are thermally welded or welded upon vibration under a state where the open end sections are brought into contact with each other. Otherwise, the open end sections of the upper and lower cases may be joined by means of clips, screws or the like. Such a technique is disclosed in Japanese Utility Model Provisional Publication No. 6-60764.
- However, difficulties have been encountered in the above conventional technique. That is, a large-sized facility for the above-mentioned welding is required thereby increasing a plant and equipment investment. Additionally, in case that the upper and lower cases are joined by means of the clips, screws or the like, such separate parts for joining are necessary, thereby raising a production cost. Furthermore, a slight clearance tends to be formed between the open end sections of the upper and lower cases. This clearance will lower a suppression effect for intake air vibration inside the air intake duct of the engine.
- It is an object of the present invention to provide an improved resonator type silencer for an automotive internal combustion engine, which can effectively overcome drawbacks encountered in similar conventional resonator type silencers.
- Another object of the present invention is to provide an improved resonator type silencer for an automotive internal combustion engine, which is high in suppression effect for intake air vibration in an air intake duct of the engine while lowering a production cost of the resonator type silencer.
- A further object of the present invention is to provide an improved resonator type silencer for an automotive internal combustion engine, by which upper and lower cases constituting the resonator type silencer can be readily joined to each other maintaining a tight seal condition of the resonator type silencer, without using any facility or members for connecting the upper and lower cases.
- A resonator type silencer according to the present invention comprises a first case having an open end section. A second case is fabricated separate from the first case. The second case has an open end section which is joinable with the open end section of the first case. The open end section of the first case includes an end edge portion having a linear projection extending along the end edge portion. The linear projection has an inclined face extending along the end edge portion and sloped down in a direction toward a surface of the open end section. The open end section of the second case includes an end wall portion. A guide wall is integral with the end wall portion and extending along an end edge portion of the open end section to define a groove extending along the end edge portion. A seal edge portion is formed at a surface of at least one of the guide wall and the end wall portion and extends along the end edge portion of the open end section of the second case to define a part of the groove. The seal edge portion is contactable with the inclined face of the linear projection of the end edge portion of the first case. Additionally, an engagement mechanism is further provided in the resonator type silencer and includes a projecting section formed integral with one of the first and second cases. A receiving section is provided for receiving the projecting section so that the projecting section and the receiving section are engageable with each other, the receiving section being formed integral with the other of the first and second cases.
- The thus arranged resonator type silencer can be readily assembled by bringing the open end sections of the upper and lower cases into contact with each other in a manner to insert the linear projection of one case into the groove formed in the other case, then by engaging the engagement mechanism formed between the upper and lower cases. This makes it unnecessary to use a large-sized facility or separate members for joining the lower and upper cases, greatly facilitating production of the resonator type silencer. Upon such assembly of the resonator type silencer, a labyrinth structure formed by the linear projection and the groove is provided between the open end sections of the lower and upper cases, while an edge contact is made between the seal edge portion and the inclined face of the linear projection. As a result, an air-tight seal can be securely maintained between the open end sections of the lower and upper cases.
- In the drawings, like reference numerals designate like parts and elements throughout all figures, in which:
- Fig. 1 is a fragmentary perspective view of an essential part of a first embodiment of a resonator type silencer according to the present invention;
- Fig. 2 is a front elevation of the resonator type silencer of Fig. 1, showing a state made before assembly of the resonator type silencer;
- Fig. 3 is a front elevation similar to Fig. 2 but showing a state made after the assembly of the resonator type silencer of Fig. 1;
- Fig. 4 is a cross-sectional view taken in the direction of the arrows substantially along the line A-A of Fig. 3;
- Fig. 5 is a cross-sectional view taken in the direction of the arrows substantially along the line B-B of Fig. 3;
- Fig. 6 is an enlarged fragmentary cross-sectional view similar to Fig. 4 but showing a second embodiment of the resonator type silencer according to the present invention in a state made before assembly;
- Fig. 7 is an enlarged fragmentary cross-sectional view similar to Fig. 6 but showing the resonator type silencer of Fig. 6 in a state made after the assembly;
- Fig. 8 is an enlarged fragmentary cross-sectional view similar to Fig. 6 but showing a third embodiment of the resonator type silencer according to the present invention in a state made before assembly;
- Fig. 9 is an enlarged fragmentary cross-sectional view similar to Fig. 8 but showing the resonator type silencer of Fig. 8 in a state made after assembly;
- Fig. 10 is an enlarged fragmentary cross-sectional view similar to Fig. 6 but showing a fourth embodiment of the resonator type silencer according to the present invention in a state made before assembly; and
- Fig. 11 is an enlarged fragmentary cross-sectional view similar to Fig. 10 but showing the resonator type silencer of Fig. 10 in a state made after the assembly.
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- Referring now to Figs. 1 to 5, an embodiment of a resonator type silencer according to the present invention is illustrated by the reference character S. The resonator type silencer S is connected to an air intake duct of an internal combustion engine of an automotive vehicle, though not shown. The air intake duct forms part of an intake system of the engine. The resonator type silencer S is provided with a
connection duct 1 through which the inside of the resonator type silencer S is communicated with the air intake duct through which intake air flows into the engine. The resonator type silencer S comprises alower case 2 which is formed generally cup-shaped and has a generally rectangular cross-section in a plane perpendicular to the longitudinal axis of the lower case. Thelower case 2 is relatively deep or large in axial length. Anupper case 3 is joined at its lower end part with thelower case 2 at an upper end part, maintaining a tightly closed state. Theupper case 3 is formed generally cup-shaped and has a generally rectangular cross-section in a plane perpendicular to the axis of theupper case 3. Theupper case 2 is relatively shallow or small in axial length. Theconnection duct 1 is formed integral with theupper case 3 and extends from anupper wall 3p of theupper case 3. Thelower case 2 is integrally provided at its outer surface withengagement projections lower case 2 is fastened to a vehicle body of the automotive vehicle. Each of the lower andupper cases - The
lower case 2 includes anopen end section 2a located at the upper end part thereof and peripherally formed endless. Theopen end section 2a includes an end edge portion P1 which laterally extends endless. Alinear projection 5 forms part of the end edge portion P1 and extends along the periphery of thelower case 2. Theprojection 5 has aninclined face 6 which extends along the periphery of thelower case 2 and sloped down in a direction from the inner surface to outer surface of theopen end section 2a. - Additionally, a plurality of hook-
like guide walls 7 are formed integral with theopen end section 2a and projected from the surface of a end wall portion P2 of theopen end section 2a. Each hook-like guide wall 7 laterally extends along the end edge portion P1 and has a generally L-shaped cross-section. More specifically, the hook-like guide wall 7 includes an outward projectingportion 7a which is integral at its base part with the end wall portion P2 of thelower case 2. The outward projectingportion 7a laterally extends along the end edge. An upward projectingportion 7b is integral at its lower part with an tip end part of the outward projectingportion 7a, so that a groove G1 extending along the end edge portion P1 is formed between the outer surface of the end wall portion P2 and the upwardly projectingportion 7b. The adjacent hook-like guide walls - A plurality of generally wedge-shaped stopper projections or projecting
sections 9 are integrally formed at the outer surface of theopen end section 2a of themain body 2A of thelower case 2. Eachstopper projection 9 is located between the adjacent hook-like guide walls stopper projection 9 forms part of an engagement mechanism (not identified) has aninclined face 8 which is sloped down in a direction toward the end edge portion P1. - The
upper case 3 includes anopen end section 3a located at the lower end part of theupper case 3 and peripherally extents endless. Theopen end section 3a includes an end edge portion E1 which extends endless to extend along the periphery of theupper case 3. A laterally extending hook-like guide wall 10 is formed integral with an end wall portion E2 of theopen end section 3a and projected from the surface of the end wall portion E2. The hook-like guide wall 10 peripherally extends along the end edge portion E1 and has a generally L-shaped cross-section. More specifically, the hook-like guide wall 10 includes an outward projectingportion 10a which is integral at its base part with the end wall portion E2 of theupper case 3. The outward projectingportion 10a peripherally extends along the end edge portion E1. A downward projectingportion 10b is integral at its upper part with an tip end part of the outward projectingportion 10a, so that a groove G2 extending along the end edge portion E1 is peripherally formed between the outer surface of the end wall portion E2 and the downward projectingportion 10b. Additionally, a peripherally extendingseal edge portion 11 is formed at the inner surface of the hook-like guide wall 10. More specifically, theseal edge portion 11 is located to extend along a linear portion (not identified) at which the outward projectingportion 10a and the downwardly projectingportion 10b is integral with each other, so that theseal edge portion 11 can be brought into contact with theinclined face 6 of thelinear projection 5 of thelower case 2 when thelinear projection 5 is inserted into the groove G2 of theupper case 3. - A plurality of tongue-like locking piece or receiving
sections 12 are formed integral with theopen end section 3a and project downward from theopen end section 3a by a certain length. Eachlocking piece section 12 forms part of a locking or engagement mechanism (not identified) is located corresponding to eachstopper projection 9 of thelower case 2. Eachlocking piece section 12 is formed with a window or opening into which thestopper projection 9 can be fitted. - A plurality of
ribs 14 are formed integral with theopen end section 3a of theupper case 3 at the inner surface so as to function to reinforce the wall of the end wall portion E2 defining the groove G2. Eachrib 14 is plate-like and perpendicular to the inner surface of amain body 3A of theupper case 3. Eachrib 14 is integral with the end edge portion E1 and extends inward as best shown in Fig. 4. Eachrib 14 further extends downward from the end wall portion E2 by a certain length so as to form a downward projectingpart 14a. The downward projectingpart 14a has a base section whose edge is formed flush with the outer surface of the end wall portion E2, so that the edge of the base section is brought into contact with the inner surface of theopen end section 2a of thelower case 2. - The above resonator type silencer S is assembled as follows: First, as shown in Figs. 1 and 2, the
open end sections upper cases part 14a of eachrib 14 of theupper case 3 is brought into slidable contact with the inner surface of theopen end section 2a of thelower case 2, so that theopen end sections upper cases open end sections upper cases linear projection 5 of thelower case 2 is inserted into the groove G2 of theupper case 3, while thelocking piece section 12 runs on theinclined face 8 of thestopper projection 9 of thelower case 2 upon elastically deforming. Then, as shown in Figs. 3 to 5, theseal edge portion 11 formed at the inner surface of the hook-like guide wall 10 of theupper case 3 is brought into tight contact with theinclined face 6 of thelinear projection 5 of thelower case 2, while thestopper projection 9 of theupper case 3 is fitted into thewindow 13 of thelocking piece section 12 so as to restrict displacement of the lower andupper cases portion 10b of theguide wall 10 of theupper case 3 is fitted into the groove G1 formed by the hook-like guide wall 7 of thelower case 2. Additionally, the inner surface of the end edge portion P1 of thelower case 2 is brought into tight contact with the outer surface of the end wall portion E2 of theupper case 3. - With the thus assembled resonator type silencer S, a so-called labyrinth structure is formed between the
open end sections lower cases upper case 3 fittingly inserted into the groove G2 of theupper case 3 and the downward projectingportion 10b of the upper case guidewall 10 fittingly inserted into the groove G1 of thelower case 2. Particularly by virtue of the fact that theseal edge portion 11 of theupper case 3 is brought into tight contact with theinclined face 6 of thelinear projection 5, a tight seal condition can be stably maintained even in case that a slight production error or the like is made in the lower andupper cases seal edge portion 11 can be suitably slidably moved on theinclined face 6 of thelinear projection 5 of thelower case 2 during assembly of the resonator type silencer S. Here, although a pressing force applied between theseal edge portion 11 and theinclined face 6 acts in a manner to inwardly thrust thelinear projection 5, thelinear projection 5 can be prevented from being bent inward owing to the fact that the end edge wall E2 (of the upper case 3) contacting with thelinear projection 5 is securely reinforced by therib 14. As a result, an air-tight seal can be securely maintained between the lower andupper cases - Thus, joining the lower and
upper cases upper case 3 onto thelower case 2 in a direction where theopen end sections locking piece section 12 to come into engagement with thestopper projection 9. Accordingly, an assembly operation of the resonator type silencer S is largely facilitated. Besides, a special facility for the assembly operation and parts for the joining are not required, thereby making it possible to produce the resonator type silencer S at a low cost. - Each
rib 14 formed at the inner surface of theupper case 3 can not only sustain a reaction force for sealing between theseal edge portion 11 of theupper case 3 and thelinear projection 5 of thelower case 2, but also serve as a guide for assembling theupper case 3 to thelower case 2 during assembly of the resonator type silencer S since the lower part of therib 14 extends downward so as to be flush with the inner surface of the end wall portion E2 of theopen end section 3a of thelower case 3. Accordingly, this resonator type silencer S omits providing an independent guide required for assembling the upper and lower cases, thereby reducing the amount of the material for the resonator type silencer thus accomplishing weight-lightening of the resonator type silencer S. - Figs. 6 and 7 illustrate an essential part of a second embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment except for the shape of the
seal edge portion 11 and arib 15 formed in thelower case 2. More specifically, theseal edge portion 11 has a thin edge-like tip endpart 16 which can be brought into tight contact with theinclined face 6 of thelinear projection 5 of therear case 2 in a manner to deform as shown in Fig. 7 when the lower andupper cases rib 15 is formed at the inner surface of amain body 2A of thelower case 2 and extends upward to theopen end section 2a. Therib 15 is perpendicular to the wall of themain body 2A. Therib 15 has anupper end edge 15a which is located to come into contact with the lower end edge of the end edge portion E1 of theupper case 3 as shown in Fig. 7 when the lower andupper cases part 16 of theseal edge portion 11 of theupper case 3. - With this embodiment, the edge-like tip end
part 16 of theseal edge portion 11 is brought into contact with theinclined face 6 of thelinear projection 5 in theopen end section 2a of thelower case 2. Accordingly, an air-tight condition can be securely maintained between the lower andupper cases upper cases rib 15 can prevent an excessive load from being applied onto the edge-like end part 16 of theseal edge portion 11. This effectively protects the seal-edge portion 11 from deterioration and therefore protects the whole resonator type silencer S from being degraded in air-tight sealing ability. - Figs. 8 and 9 illiterate an essential part of a third embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment except for the shape of the
linear projection 5 of thelower case 2 and the cross-sectional shape of the upper part of the groove G2 formed in theupper case 3. More specifically, in this embodiment, thelinear projection 5 in the end edge portion P1 of thelower case 2 has two oppositeinclined faces inclined face 6A is sloped down in a direction toward the inner surface of the end wall portion P2. In theupper case 3, anotherseal edge portion 11A is formed at a linear portion (not identified) where the outward projectingportion 10a of theguide wall 10 is integral with the end edge portion E1 of theupper case 3. Theseal edge portions lower case 2. - With this arrangement, when the lower and
upper cases seal edge portions lower case 2, thereby ensuring an air-tight seal between theopen end sections upper cases linear projection 5 can be rigidly pressed by the twoseal edge portions linear projection 5 from being displaced within the groove G2. - Figs. 10 and 11 illustrate an essential part of a fourth embodiment of the resonator type silencer S according to the present invention, which is similar to that of the first embodiment with the exception that a
linear projection 17 having a semicircular cross-sectional shape is formed at the inner surface of the end wall portion P2 in theopen end section 2a of thelower case 2. - With this arrangement, when the lower and
upper cases linear projection 17 formed at the inner surface of the end wall portion P2 is brought into contact with the outer surface of the end wall portion E2 of theupper case 3 as shown in Fig. 11, thereby effectively supporting the back-side of theinclined face 6 of thelinear projection 5 of thelower case 2 thus ensuring an air-tight seal between theinclined face 6 of thelinear projection 5 of thelower case 2 and theseal edge portion 11 of theupper case 3. - As appreciated from the above, according to the above embodiments, the open end sections of the upper and lower cases are brought into alignment with and contact with each other. Then, the linear projection of one case is inserted into the groove formed in the other case, in which the inclined face of the linear projection comes into tight contact with the seal edge portion formed in the groove, thereby accomplishing a tight seal between the upper and lower cases. Thus, the upper and lower cases can be readily joined with each other maintaining a tight seal condition, thereby making it unnecessary to use a large-scale facility only for joining the cases or separate parts for joining the cases. This lowers production cost for the resonator type silencer as compared with conventional techniques. Additionally, the labyrinth structure is formed between the linear projection and the groove while an edge contact is formed between the seal edge portion and the inclined face of the linear projection. This provides a secure air-tight seal between the upper and lower cases, thus stably obtaining the suppression effect on the intake air vibration. Particularly, sealing with the seal edge portion is effectively accomplished by causing the seal edge portion to contact with the inclined face formed on the linear projection, and therefore the air-tight seal can be securely maintained between the upper and lower cases upon the seal edge portion slidably displacing on the inclined face of the linear projection during assembly of the upper and lower cases even if a slight production error is made in the upper and/or lower cases. This reduces irregularity in vibration suppression effect among many products.
- While the invention has been described above by reference to certain embodiments of the invention, the invention is not limited to the embodiments described above. Modifications and variations of the embodiments described above will occur to those skilled in the art, in light of the above teachings. For example, although the
linear projection 5 has been shown and described as being formed at the side of thelower case 2 while theguide wall 10 and theseal edge portion 11 have been shown and described as being formed at the side of theupper case 3, it will be understood that, to the contrary, thelinear projection 5 may be formed at the side of theupper case 3 while theguide wall 10 and theseal edge portion 11 may be formed at the side of thelower case 2.
Claims (7)
- A resonator type silencer for an intake system of an internal combustion engine of an automotive vehicle, comprising:a first case having an open end section; anda second case fabricated separate from said first case, said second case having an open end section which is joinable with the open end section of said first case;wherein the open end section of said first case includes an end edge portion having a linear projection extending along the end edge portion, said linear projection having an inclined face extending along the end edge portion and sloped down in a direction toward a surface of the open end section;wherein the open end section of said second case includes an end wall portion, and a guide wall integral with the end wall portion and extending along an end edge portion of said open end section to define a groove extending along the end edge portion, and a seal edge portion formed at a surface of at least one of the guide wall and the end wall portion and extending along the end edge portion of said open end section of said second case so as to define a part of the groove, said seal edge portion being contactable with the inclined face of the linear projection of said end edge portion of said first case;wherein said resonator type silencer further comprises an engagement mechanism including a projecting section formed integral with one of said first and second cases, and a receiving section for receiving the projecting section so that the projecting section and the receiving section are engageable with each other, the receiving section being formed integral with the other of said first and second cases.
- A resonator type silencer as claimed in Claim 1, wherein the inclined face of the linear projection is sloped down in a direction toward an outer surface of the open end section of said first case, wherein said second case includes a reinforcement rib formed at an inner surface of said second case and extending perpendicular to the end edge portion of said second case, the rib projecting over the end edge portion of said second case to form a projecting part which has an edge flush with an outer surface of the end wall portion of said second case.
- A resonator type silencer as claimed in Claim 1, wherein the projecting section of said engagement mechanism has an inclined face which is sloped down in a direction toward the end edge portion, wherein the receiving section of said engagement mechanism is projected over the end edge portion and elastic in a direction perpendicular to a plane parallel with the end wall portion so that the receiving section is slidably movable along the inclined face of the projecting section, the receiving section being formed with an opening into which the projecting section being capable of being fitted.
- A resonator type silencer as claimed in Claim 1, wherein said each of said first and second cases is formed of thermoplastic resin and fabricated as a one-piece structure.
- A resonator type silencer as claimed in Claim 1, wherein each of said first and second cases is generally cup-shaped so that the open end section extends endlessly along a periphery of each case.
- A resonator type silencer as claimed in Claim 1, wherein said guide wall includes an outward projecting portion integral with the end wall portion of said second case, and a vertically extending portion generally parallel with the end wall portion and integrally connected with the outwardly projecting portion to define the groove, wherein the seal edge portion of said second case is formed integral with at least one of the outwardly projecting portion and the vertically extending portion.
- A resonator type silencer as claimed in Claim 2, wherein said reinforcement rib is generally plate-shaped and formed perpendicular to a wall of said second case.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000617075 DE60017075T2 (en) | 2000-03-10 | 2000-03-10 | Resonator silencer for a vehicle engine |
EP20000105114 EP1132611B1 (en) | 2000-03-10 | 2000-03-10 | Resonator type silencer for automotive engine |
DE2000105114 DE1132611T1 (en) | 2000-03-10 | 2000-03-10 | Resonator silencer for a vehicle engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20000105114 EP1132611B1 (en) | 2000-03-10 | 2000-03-10 | Resonator type silencer for automotive engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1132611A1 true EP1132611A1 (en) | 2001-09-12 |
EP1132611B1 EP1132611B1 (en) | 2004-12-29 |
Family
ID=8168074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000105114 Expired - Lifetime EP1132611B1 (en) | 2000-03-10 | 2000-03-10 | Resonator type silencer for automotive engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1132611B1 (en) |
DE (2) | DE1132611T1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2096296A1 (en) * | 2008-02-29 | 2009-09-02 | Mann+Hummel Gmbh | Filter casing |
US7976603B2 (en) | 2007-03-05 | 2011-07-12 | Mann+Hummel Gmbh | Filter housing |
US8001945B2 (en) | 2005-09-16 | 2011-08-23 | Mann + Hummel Gmbh | Resonator for an intake system of a motor vehicle |
CN107204181A (en) * | 2017-07-26 | 2017-09-26 | 安徽理工大学 | A kind of resonant labyrinth noise reduction method and set composite |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1476196A1 (en) * | 1963-02-16 | 1969-07-10 | Ambrogio Fiocchi | Plastic air filter for carburetors of internal combustion engines |
JPH0660764A (en) | 1992-08-07 | 1994-03-04 | Fujitsu Ltd | Manufacture of reed switch |
US5295602A (en) * | 1993-03-17 | 1994-03-22 | General Motors Corporation | Housing with snap latch closure |
DE4326731A1 (en) * | 1993-08-09 | 1995-02-16 | Knecht Filterwerke Gmbh | Air filter for internal combustion engines, compressors and other naturally aspirated machines |
FR2745038A1 (en) * | 1996-02-16 | 1997-08-22 | Renault | I.c. engine air filter positioning system |
US5725624A (en) * | 1994-04-14 | 1998-03-10 | Filterwerk Mann & Hummel Gmbh | Air filter for the intake air of an internal-combustion engine |
EP0897060A2 (en) * | 1997-08-13 | 1999-02-17 | Honda Giken Kogyo Kabushiki Kaisha | Intake silencer system |
DE19811051A1 (en) * | 1998-03-13 | 1999-09-16 | Mann & Hummel Filter | Sound damping for air intake in IC engine |
-
2000
- 2000-03-10 DE DE2000105114 patent/DE1132611T1/en active Pending
- 2000-03-10 DE DE2000617075 patent/DE60017075T2/en not_active Expired - Lifetime
- 2000-03-10 EP EP20000105114 patent/EP1132611B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1476196A1 (en) * | 1963-02-16 | 1969-07-10 | Ambrogio Fiocchi | Plastic air filter for carburetors of internal combustion engines |
JPH0660764A (en) | 1992-08-07 | 1994-03-04 | Fujitsu Ltd | Manufacture of reed switch |
US5295602A (en) * | 1993-03-17 | 1994-03-22 | General Motors Corporation | Housing with snap latch closure |
DE4326731A1 (en) * | 1993-08-09 | 1995-02-16 | Knecht Filterwerke Gmbh | Air filter for internal combustion engines, compressors and other naturally aspirated machines |
US5725624A (en) * | 1994-04-14 | 1998-03-10 | Filterwerk Mann & Hummel Gmbh | Air filter for the intake air of an internal-combustion engine |
FR2745038A1 (en) * | 1996-02-16 | 1997-08-22 | Renault | I.c. engine air filter positioning system |
EP0897060A2 (en) * | 1997-08-13 | 1999-02-17 | Honda Giken Kogyo Kabushiki Kaisha | Intake silencer system |
DE19811051A1 (en) * | 1998-03-13 | 1999-09-16 | Mann & Hummel Filter | Sound damping for air intake in IC engine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8001945B2 (en) | 2005-09-16 | 2011-08-23 | Mann + Hummel Gmbh | Resonator for an intake system of a motor vehicle |
US7976603B2 (en) | 2007-03-05 | 2011-07-12 | Mann+Hummel Gmbh | Filter housing |
EP2096296A1 (en) * | 2008-02-29 | 2009-09-02 | Mann+Hummel Gmbh | Filter casing |
CN107204181A (en) * | 2017-07-26 | 2017-09-26 | 安徽理工大学 | A kind of resonant labyrinth noise reduction method and set composite |
Also Published As
Publication number | Publication date |
---|---|
EP1132611B1 (en) | 2004-12-29 |
DE60017075T2 (en) | 2005-05-25 |
DE1132611T1 (en) | 2002-02-21 |
DE60017075D1 (en) | 2005-02-03 |
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