Embodiments of the invention will be described below with reference to the accompanying drawings.
With reference to
The housing 2 is constituted with a pair of housing components 3 and 6 as first and second housing component. The housing component 3 is a casing 3 serving as the lower portion of the housing 2. The other housing component 6 is a cover 6 serving as the upper portion of the housing 2. The casing 3 has four sides on the periphery and a closed bottom. The upper end of the casing 3 is formed as an open end 4. The open end 4 has a flange 4a projecting outward of the casing 3 on the peripheral edge. The cover 6 has four sides on the periphery and the upper portion is closed by the top surface. The lower end of the cover 6 is formed as an open end 7. The open ends 4 and 7 of the respective casing 3 and cover 6 are fitted on each other, thereby forming the box-shaped housing 2. The open ends 4 and 7 of the respective casing 3 and cover 6 are engageable with and disengageable from each other.
One of the sides of the casing 3 has a cylindrical inlet 8 extending outward. The inlet 8 allows the air taken into the intake system from the atmosphere to flow into the housing 2. One of the sides of the cover 6 has a cylindrical outlet 8 extending outward. The outlet 8 is connected to a path connecting to the engine, feeding the air filtered by the air-cleaner 1 to the engine.
The filter element 20 mounted in the housing 2 includes a filtering member 21 folded into continuous peaks and troughs. The filter element 20 also includes a holding frame 22 arranged around the filtering member 21 and holding the filtering member 21. The filter element 20 further includes a packing 23 fitted to the entire periphery on the outer surface of the holding frame 22. While the filter element 20 including a rib 24 that is provided at the center of the holding frame 22 is illustrated in
The filter element 20 is held between the casing 3 and the cover 6 and fitted in the housing 2. The filter element 20 separates the interior of the housing 2 into a dust side as an atmospheric side and a clean side as an engine side. The air-cleaner 1 according to the first embodiment includes the dust side corresponding to a side of the casing 3 relative to the filter element 20, and the clean side corresponding to a side of the cover 6 relative to the filter element 20.
With reference
As illustrated in
The plate-like adsorption element 30 includes an adsorption portion 31 containing, for example, activated carbon. The adsorption element 30 also includes a frame 32 arranged on the periphery of the adsorption element 30 and holding the adsorption portion 31. The adsorption portion 31 is structured, for example, so that activated carbon powder is impregnated into a nonwoven fabric or held between a pair of nonwoven fabrics. The frame 32 holding the adsorption portion 31 is made of a resin. The support member 40 is a molded component made of a resin.
The support member 40 includes a frame 41 formed to be slightly smaller in outer edge than the frame 32 of the adsorption element 30. The support member 40 includes ribs 42 extending longitudinally and transversely in the frame 41. The support member 40 is put on the adsorption element 30, whereby the support member 40 prevents the adsorption portion 31 of the adsorption element 30 from being flexed. Namely, the frame 41 serving as the peripheral edge of the support member 40 coincides with the frame 32 of the adsorption element 30. The ribs 42 arranged inside of the frame 41 are put on the adsorption element 30 along the adsorption portion 31 of the adsorption element 30. Due to this, even if an external force acts on the adsorption portion 31 of the adsorption element 30, the support member 40 supports the adsorption portion 31, thus preventing the adsorption portion 31 from being flexed toward the support member 40.
In the air-cleaner 1 according to the first embodiment, the adsorption element 30 and the support member 40 are vibration welded to the mounting portion 11 of the cover 6 as illustrated in
First, the structure of the mounting portion 11 formed on the flange 10 of the cover 6, that of the frame 32 of the adsorption element 30, and that of the frame 41 of the support member 40 will be described in detail.
As described above, the mounting portion 11 formed on the flange 10 is the first step arranged inside and back of the cover 6. The mounting portion 11 has a weld-projection 16. The weld-projection 16 extends along the entire periphery of the mounting portion 11 and projects from the surface of the first step at the center of the mounting portion 11. The weld-projection 16 has an outer wall 15 formed outside thereof and similarly projecting from the surface of the first step of the mounting portion 11. The outer wall 15 is formed to surround the weld-projection 16 on the entire periphery thereof. The inner region of the weld-projection 16 is a depression 17 formed on the entire periphery of the mounting portion 11. The depression 17 is the region having the frame 41 of the support member 40 fitted therein.
A side of the frame 41 of the support member 40 fitted in the depression 17 is formed flat. The flat side of the frame 41 is fitted in the depression 17. The opposite side of the frame 41 includes a weld-projection 43 projecting toward the open end 7 of the cover 6 and an inner wall 44. The weld-projection 43 is formed on the entire periphery of the frame 41 along the outer edge of the frame 41. When the frame 41 is fitted into the depression 17, the weld-projection 43 comes adjacent to the weld-projection 16 formed on the mounting portion 11 of the cover 6. The ends of the weld-projections 43 and 16 are directed toward the open end 7 of the cover 6. The inner wall 44 projects from the opposite side of the frame 41 inside the weld-projection 43 with a predetermined clearance formed between the inner wall 44 and the weld-projection 43. Similarly to the weld-projection 43, the inner wall 44 is formed on the entire periphery of the frame 41.
The frame 32 of the adsorption element 30, by contrast, includes a flat side directed to the open end 7 of the cover 6. The frame 32 has an opposite side directed toward the interior of the cover 6. The opposite side of the frame 32 has a weld-projection 33. The weld-projection 33 projects from the opposite side of the frame 32 toward the interior of the cover 6 slightly inside of the outer edge of the frame 32. Similarly to the weld-projection 43 of the support member 40 and the weld-projection 16 of the mounting portion 11, the weld-projection 33 is formed on the entire periphery of the frame 32. The thickness of the weld-projection 33 substantially coincides with the sum of the thickness of the weld-projection 43 of the support member 40 and that of the weld-projection 16 of the mounting portion 11.
The mounting portion 11 of the cover 6, the frame 41 of the support member 40, and the adsorption element 30 are formed integrally with one another. Namely, the weld-projection 16 of the mounting portion 11 and the weld-projection 43 of the support member 40 are abutted against and vibration welded to the weld-projection 33 of the adsorption element 30, thereby welding the mounting portion 11, the frame 41, and the adsorption element 30 to one another. The vibration welding allows the end of the outer wall 15 projecting from the mounting portion 11 of the cover 6 to be closely attached to the frame 32 of the adsorption element 30. Therefore, the outer wall 15 partitions off the outside from the inside thereof and forms a hermetically-sealed space between the outer wall 15 and the weld-projections 16 and 33 over the entire periphery of the outer wall 15. Likewise, the vibration welding allows the end of the inner wall 44 projecting from the frame 41 of the support member 40 to be closely attached to the frame 32 of the adsorption element 30. Therefore, the inner wall 44 partitions off the outside from the inside thereof, forming a hermetically-closed space between the inner wall 44 and the weld-projections 33 and 43 over the entire periphery of the inner wall 44.
Both of the outer wall 15 and the inner wall 44 function as a burr concealment. Namely, the vibration welding causes burrs from the weld-projections 16, 33, and 43, with the abutted weld-projections 16, 33, and 43 slid each other. If the burrs are scattered inside of the air-cleaner 1, they can possibly cause damage and clogging of the filter element 20 or other failures. If the burrs are scattered outside of the outer wall 15, they can possibly damage the packing 23 of the filter element 20 fitted to the first step.
However, in the air-cleaner 1 according to the first embodiment, the outer wall 15 and the inner wall 44 function as a burr concealment. Therefore, the produced burrs remain in the hermetically-closed space between the outer wall 15 and the weld-projections 16 and 33 and that between the inner wall 44 and the weld-projections 33 and 43, thus securely preventing the burrs from being scattered.
The instance of forming the outer wall 15 on the mounting portion 11 of the cover and forming the inner wall 44 on the frame 41 of the support member 40 has been described while referring to
The plate-like adsorption element 50 includes an adsorption portion 51 and a frame 52 holding the circumference of the adsorption portion 51. The adsorption element 50 includes through-holes 53 passing through the frame 52 in a thickness direction of the frame 52. The support member 60 includes a frame 61 slightly smaller in peripheral edge than the frame 52 of the adsorption element 50. The support member 60 includes ribs 62 arranged transversely in the frame 61. The frame 61 of the support member 60 includes through-holes 63 extending through the frame 61 in a thickness direction of the frame 61.
The through-holes 53 of the frame 52 of the adsorption element 50 and the through-holes 63 of the frame 61 of the support member 60 are positioned coinciding with one another in the peripheral directions of the frames 52 and 61. Therefore, when the support member 60 is put on the adsorption element 50, the through-holes 53 and 63 communicate with one another at respective positions.
In the second embodiment, similarly to the first embodiment, the cover 6 serving as the clean side includes the flange 10 of a two-step structure on the open end. Two steps include a first step formed inside and back of the cover 6. The first step serves as the mounting portion 11 having the adsorption element 50 mounted thereto. The two steps include a second step formed outside on the end side. The second step serves as the fitting portion 12 of a filter element.
The second step has a frame of the filter element (not illustrated) located thereon. The second step and a casing (not illustrated) hold therebetween a packing (not illustrated) on the outer periphery of the frame constituting the filter element. The air-cleaner 1 according to the second embodiment is similar in this respect to that according to the first embodiment.
Differently from the first embodiment, as illustrated in
The pins 70 project from the surface of the mounting portion 11 to the open side of the cover 6 at substantially widthwise central positions of the mounting portion 11. Each of the pins 70 has an axial dimension, which dimension is larger than the sum of a thickness of the frame 52 of the adsorption element 50 and that of the frame 61 of the support member 60.
The cover 6, the adsorption element 50, and the support member 60 are formed integrally with one another as follows. First, as shown in
Next, as illustrated in
The second embodiment has been described while referring to the instance of the air-cleaner 1 configured so that the casing serves as a dust side and so that the cover 6 serves as the clean side. However, the second embodiment is not limited to the instance. The casing may be constituted as the clean side and the cover may be constituted as the dust side. In this case, the adsorption element is fixed to the casing. Namely, the invention is intended to effectively adsorb the vaporized fuel flowing into the housing of the air-cleaner. Therefore, it suffices to fix the adsorption element to the housing component serving as the clean side of the housing.
Needless to say, a putting order of the adsorption element and the support member is such that the support member is located back in the housing component so as to be located downstream of the intake air relative to the adsorption element. This location prevents the adsorption portion of the adsorption element from being flexed downstream of the air.
Although 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. The scope of the invention is defined with reference to the following claims.
According to the invention, the support member supports the adsorption element downstream of the intake system, preventing an air-flow produced in the air-cleaner during air intake from flexing the adsorption portion downstream. Consequently, the adsorption element is formed thinner, preventing air-flow resistance from increasing during air intake. Said one housing component is provided with the mounting portion, and the adsorption element and the support member are put on each other, being fixed to the mounting portion, not causing interference with the air-flow.
With the vibration welding adopted as a fixing method, the weld-projection has the first and second walls inside and outside thereof. The first and second walls function as a burr concealment preventing burrs caused by the vibration welding from being scattered. Caulking of a pin may be adopted as a fixing method. This method allows the adsorption element and the support member to be securely fixed to a housing component using simple fabrication steps.
With either of the fixing methods adopted, removing of the adsorption element fixed to the housing is required to destroy the mounting portion, which responds to a request that the adsorption element has a structure not to be removed from the housing.
Number | Date | Country | Kind |
---|---|---|---|
2006-217074 | Aug 2006 | JP | national |