JP6291858B2 - Secondary air cleaner - Google Patents

Description

  The present invention relates to a secondary air cleaner suitably used for a motorcycle.

  2. Description of the Related Art In recent years, a secondary air cleaner that supplies secondary air to an engine exhaust system to purify exhaust gas is widely used in motorcycles as a countermeasure for environmental problems.

  For example, Patent Document 1 discloses a sub air cleaner that includes a case part integrally formed with a rear fender, and a lid that is fixed to the case part with an air filter interposed between the case part and the case part. . The interior of the sub air cleaner is divided into a clean room and a dirty room by an air filter. The lid has an air intake duct communicating with the dirty room extending in parallel with the air filter, and the case part is integrally formed with a joint pipe communicating with the clean room. Air entering the dirty room from the intake duct is purified when passing through the air filter, and the clean air is sent downstream from the clean room through the joint pipe.

JP 2002-235535 A

  However, in the sub air cleaner described in Patent Document 1, since the intake duct extends in parallel with the air filter, it is difficult to uniformly diffuse the sucked air to the filtration surface of the air filter. In particular, there is a problem that dust easily collects in the vicinity of the outlet of the intake duct and a filtration effect corresponding to the filtration area of the air filter cannot be obtained. Although it is conceivable to increase the volume of the dirty room in order to diffuse the inhaled air, this has caused another problem that the sub air cleaner cannot be reduced in size.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a secondary air cleaner that is compact and can effectively exhibit the performance of a filter.

The present invention is a secondary air cleaner for purifying air introduced from the outside in order to purify exhaust gas from an internal combustion engine, a cleaner case having a dirty side case and a clean side case , the dirty side case and the clean side case A filter provided to be sandwiched between the side case, a dirty room located on one side of the internal space of the cleaner case and defined by the filter and the dirty side case, and an internal space of the cleaner case A clean room defined by the filter and the clean side case, and a part of a wall portion facing the filter in the clean side case is recessed by one step toward the one side. The A recessed portion, an outer pipe provided outside the cleaner case, and an inner pipe connected to the outer pipe and provided inside the cleaner case so as to pass through the clean room and reach the dirty room. An inlet pipe having an outlet pipe provided outside the cleaner case so as to communicate with the clean room. An intake outlet portion is formed at a distal end portion on the intake outlet side, an exhaust outlet portion is formed at a distal end portion on the exhaust outlet side of the outlet pipe, and the intake outlet portion is disposed in the dirty room, and the intake outlet portion The inner wall of the clean side case where the extension line of the central axis of the filter faces the filter When the clean side case is viewed from a direction perpendicular to the filtration surface of the filter, the outer pipe and the outlet pipe are shifted from the center position in the clean side case. The outer pipe and the outlet pipe are respectively extended from the connection position with the clean side case toward the recessed portion, and the intake inlet portion and the exhaust outlet portion correspond to the recessed portion. It is characterized by being formed at each position .

  According to this configuration, the inlet pipe is provided so that the extended line of the central axis of the outlet portion intersects the inner wall surface of the cleaner case facing the filter. For this reason, the air introduced into the dirty room from the outside flows out from the outlet portion toward the inner wall surface, collides with the inner wall surface, and diffuses into the dirty room. Thereby, the air containing dust can be cleaned using the substantially whole area of the filtration surface of a filter. That is, the performance of the filter is effectively exhibited, and the cleaning efficiency can be improved. Moreover, since the filtered dust can be held in substantially the entire filter surface of the filter, the life of the filter can be improved. Furthermore, since the introduced air collides with the inner wall surface of the cleaner case and diffuses into the dirty room, it is possible to secure a large filter surface area and reduce the volume of the dirty room. . Thereby, a secondary air cleaner can be formed compactly. For example, the secondary air cleaner can be disposed in a narrow and flat space such as the lower side of a step floor provided in a scooter type motorcycle.

  In this case, it is preferable that the inlet pipe extends through the filter from the clean room toward the dirty room.

  According to this configuration, by setting the inlet pipe to penetrate the filter, the air flowing out from the outlet portion collides with the opposing inner wall surface and diffuses in all directions. Thereby, the filtration surface of the filter can be used substantially uniformly to efficiently clean the air.

  In this case, it is preferable that the inlet pipe is provided so that an extension line of the central axis of the outlet portion is orthogonal to the inner wall surface of the cleaner case.

  According to this configuration, the air flowing out from the outlet portion of the inlet pipe collides perpendicularly with the opposing inner wall surface, and diffuses substantially uniformly in all directions. Thereby, the filtration surface of the filter can be used substantially uniformly to efficiently clean the air.

  In this case, it is preferable that the inlet pipe is configured such that a distance between the outlet portion and the inner wall surface of the cleaner case is larger than an inner diameter of the outlet portion.

  According to this structure, by ensuring the space | interval with the inner wall surface which opposes an exit part larger than the internal diameter of an exit part, the flow of the air which collided with the inner wall surface does not stagnate, and diffuses air smoothly. be able to.

In this case, the previous SL outlet pipe and the outer pipe, which is preferably parallel to juxtaposed at a position corresponding to the recessed portion.

  According to this configuration, the secondary air cleaner can be compactly formed by arranging the outlet pipe and the outer pipe side by side on the outer side of the cleaner case. Moreover, since the outlet pipe and the outer pipe are arranged side by side, good maintainability can be provided for the user. For example, it is possible to easily perform piping work such as a hose connected to the outlet pipe and the outer pipe in a state where the secondary air cleaner is arranged on the vehicle.

  According to this invention, while being able to form compactly, the performance of a filter can be exhibited effectively.

1 is a perspective view showing a motorcycle including a secondary air cleaner according to an embodiment of the present invention. It is a side view which shows a secondary air supply apparatus provided with the secondary air cleaner which concerns on one Embodiment of this invention. It is a top view which shows a secondary air supply apparatus provided with the secondary air cleaner which concerns on one Embodiment of this invention. It is a perspective view which shows the secondary air cleaner which concerns on one Embodiment of this invention. It is a top view which shows the secondary air cleaner which concerns on one Embodiment of this invention. It is VI-VI sectional drawing in FIG. It is VII-VII sectional drawing in FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  With reference to FIG. 1 thru | or FIG. 7, the motorcycle 1 provided with the secondary air cleaner 41 which concerns on this embodiment is demonstrated. Here, FIG. 1 is a perspective view showing the motorcycle 1. 2 and 3 are a side view and a plan view showing the secondary air supply device 5 including the secondary air cleaner 41. 4 and 5 are a perspective view and a plan view showing the secondary air cleaner 41. FIG. 6 and 7 are a VI-VI sectional view and a VII-VII sectional view in FIG. Note that “Fr” indicated by an arrow in each figure indicates the front of the motorcycle 1. Further, in the following description, each direction is set based on the state in which the occupant has boarded the motorcycle 1.

  As shown in FIGS. 1 to 3, the scooter type motorcycle 1 includes a vehicle body frame 2, an engine 3 as an internal combustion engine, and a vehicle body cover 4 as a vehicle body exterior. The motorcycle 1 includes a secondary air supply device 5 that is connected to the exhaust path of the engine 3 and supplies clean air (secondary air) used for exhaust purification.

  As shown in FIGS. 2 and 3, the vehicle body frame 2 includes a frame main tube 10 extending in the front-rear direction, and a pair of left and right frame side tubes 11 extending toward the rear upper side of the frame main tube 10. And a bridge member 12 constructed between the pair of left and right frame side tubes 11. In addition, each member which comprises the vehicle body frame 2 is formed with steel materials, an aluminum alloy material, etc., and is connected by methods, such as welding.

  As shown in FIG. 1, a pair of left and right front forks 13 are supported by a head pipe (not shown) provided at the front portion of the frame main tube 10 so as to be steerable left and right. A front wheel 14 is rotatably supported on the lower portion of the front fork 13. A handle bar 15 is provided on the upper portion of the front fork 13.

  As shown in FIGS. 1 and 2, a seating seat 16 is provided on the upper rear side of the frame side tube 11. A storage box 17 is provided below the seating seat 16. The seating seat 16 is configured to be openable and closable, and serves as a lid for the storage box 17. Although not shown, a gasoline tank is disposed behind the storage box 17.

  As shown in FIGS. 2 and 3, the bridge member 12 is provided below the seating seat 16 so as to support the front end surface of the storage box 17. The bridge member 12 is formed long in the left-right direction, and both left and right ends of the bridge member 12 are connected to the frame side tubes 11.

  A plurality of (for example, four) joint brackets 18 for reinforcement are provided at a joint portion between the bridge member 12 and each frame side tube 11. The four joining brackets 18 are fixed to the upper side and the lower side at the left and right ends of the bridge member 12. Each joining bracket 18 is formed in a substantially triangular plate shape in which two sides are fixed along the frame side tube 11 and the bridge member 12.

  As shown in FIGS. 2 and 3, the engine 3 is disposed below the storage box 17 between the pair of left and right frame side tubes 11. The engine 3 includes a crankcase 20 having a crankshaft (not shown) to which a piston is connected, and a cylinder 21 extending substantially horizontally from the crankcase 20.

  The crankcase 20 is connected via a swing pivot P provided at the rear portion of the frame main tube 10 so as to be swingable in the vertical direction. On the left side of the crankcase 20, a transmission case 22 for housing a belt type continuously variable transmission (not shown) is provided (see FIG. 3). A rear wheel 23 as a drive wheel is rotatably supported at the rear end of the transmission case 22 (see FIG. 1). That is, the engine 3 is configured as a so-called unit swing type engine in which the transmission case 22 functions as a swing arm.

  A (first) air cleaner 24 that filters combustion air is disposed above the transmission case 22. A reed valve 25 for supplying secondary air is disposed on the opposite side (right side) of the air cleaner 24 across the rear wheel 23.

  An intake port 21b for connecting an intake pipe (not shown) is formed above the cylinder head 21a of the cylinder 21. An exhaust port 21c for connecting the exhaust pipe 27 is formed below the cylinder head 21a. The air and fuel purified by the air cleaner 24 are mixed and supplied to a combustion chamber (not shown) in the cylinder 21 through the intake pipe and the intake port 21b. The air-fuel mixture burns in the combustion chamber, and the combustion pressure pushes the piston and rotates the crankshaft. The rotational force of the crankshaft is transmitted to the rear wheel 23 via the belt type continuously variable transmission in the transmission case 22. The exhaust gas after combustion passes through the exhaust port 21c and the exhaust pipe 27 and is discharged from the exhaust muffler 28 (exhaust path).

  As shown in FIG. 1, the vehicle body cover 4 includes a front cowl 30 provided so as to cover the front fork 13, a step board 31 extending rearward from the lower end of the front cowl 30, and a rear of the step board 31. And a seat cowl 32 provided on the lower side of the seating seat 16.

  The front cowl 30 is erected on the front side of the vehicle body so as to protect the occupant's legs. The step board 31 includes a step floor 33 on which the occupant seated on the seating seat 16 puts both feet, and side lower covers 34 that cover both left and right ends of the step floor 33. The step floor 33 is supported by a frame bracket 10a (see FIG. 2) that is fixed to the upper surface of the frame main tube 10. The seat cowl 32 is formed so as to cover the pair of left and right frame side tubes 11.

  As shown in FIGS. 2 and 3, the secondary air supply device 5 is connected to an inlet hose 40 that introduces air (outside air) from a plurality of suction ports 40 a formed at the upper end portion, and a lower end portion of the inlet hose 40. A secondary air cleaner 41 that cleans air introduced from the outside via the inlet hose 40, an outlet hose 42 that supplies the air purified by the secondary air cleaner 41 to the exhaust muffler 28 of the engine 3, It has. The above-described reed valve 25 is provided at an intermediate portion of the outlet hose 42.

  First, the secondary air cleaner 41 will be described. The secondary air cleaner 41 is disposed on the lower right side of the frame main tube 10 below the step floor 33. That is, the secondary air cleaner 41 is disposed in a space surrounded by the step floor 33 and the side lower cover 34.

  As shown in FIGS. 4 to 7, the secondary air cleaner 41 is divided into a dirty room R <b> 1 and a clean room R <b> 2 by a filter 43 that filters foreign matters such as dust contained in the introduced air, and the filter 43. A cleaner case 44, an inlet pipe 45 connected to the cleaner case 44 so as to communicate with the dirty room R1, and an outlet pipe 46 provided outside the cleaner case 44 so as to communicate with the clean room R2. .

  As shown in FIGS. 4 and 5, the cleaner case 44 is formed in a substantially triangular prism shape that is substantially flat in the vertical direction using a resin material or the like. The cleaner case 44 is configured to be vertically split by a dirty side case 47 constituting the dirty room R1 and a clean side case 48 constituting the clean room R2.

  As shown in FIG. 6, the dirty side case 47 is formed in a substantially tray shape with the upper surface opened. A filter housing portion 50 for housing the filter 43 is formed on the inner upper side of the dirty side case 47. A flange portion 51 is formed on the outer upper portion of the dirty side case 47. An annular groove 52 is recessed on the upper surface of the flange portion 51.

  The clean side case 48 is formed in a substantially tray shape that opens the lower surface. A flange portion 53 is formed at the outer lower portion of the clean side case 48. An annular protrusion 54 is provided on the lower surface of the flange portion 53. As shown in FIG. 5, a pair of case brackets 55 are formed on the left side of the clean side case 48 in the front-rear direction. Further, on the right side of the clean side case 48, a recessed portion 56 having a stepped portion and being lowered by one step is formed (see FIG. 4 and the like).

  The filter 43 is formed in a substantially triangular shape in plan view so as to be fitted into the filter housing portion 50 of the dirty side case 47. As shown in FIGS. 6 and 7, the filter 43 is formed in a substantially thick plate shape having a flat filtration surface 43a. The filter 43 is provided so as to be sandwiched between the dirty side case 47 and the clean side case 48. The filter 43 may be accommodated in the clean side case 48.

  A through hole 43b is formed in the filter 43 at a position shifted to the right side from the center (centroid) position in plan view. The through hole 43b has a circular shape in plan view and is formed to penetrate in the thickness direction.

  The filter surface 43 a of the filter 43 and the bottom surface 47 a (inner wall surface) of the dirty side case 47 facing the filter 43 are provided substantially parallel to each other. Similarly, the filtration surface 43a of the filter 43 and the top surface 48a of the clean side case 48 facing the filter 43 are provided substantially parallel to each other.

  Next, as shown in FIG. 6, the inlet pipe 45 is installed in the cleaner case 44 so as to pass through the clean room R2 and reach the dirty room R1. The inlet pipe 45 has an air intake outlet 63 disposed in the dirty room R1 so as to introduce air from the outside of the cleaner case 44 into the dirty room R1.

  Specifically, the inlet pipe 45 is formed integrally with the clean side case 48 using a resin material or the like. The inlet pipe 45 includes an outer pipe 60 provided outside the cleaner case 44, and an inner pipe 61 connected to the outer pipe 60 and provided inside the cleaner case 44 including the intake outlet portion 63. .

  As shown in FIGS. 4 and 5, the outer pipe 60 is formed in a cylindrical shape and is disposed in parallel to the upper surface of the clean side case 48 (the recessed portion 56). The outer pipe 60 is connected to a position shifted from the center (centroid) position of the clean side case 48 (filter 43) to the right side (in the vicinity of the recessed portion 56) in plan view. The outer pipe 60 extends from the connection position toward the right rear (recessed portion 56). An intake inlet portion 62 is formed at the distal end portion of the outer pipe 60 so as to face above the recessed portion 56.

  As shown in FIG. 6, the inner pipe 61 is formed in a cylindrical shape. The inner pipe 61 extends downward from a connection position between the clean side case 48 and the outer pipe 60. The inner pipe 61 is suspended from the top surface 48 a of the clean side case 48 so as to be orthogonal to the outer pipe 60. The inner pipe 61 extends through the filter 43 (through hole 43b) from the clean room R2 toward the dirty room R1. The tip of the inner pipe 61 is inserted into the through hole 43 b of the filter 43. An intake outlet 63 is formed at the tip of the inner pipe 61. The intake outlet portion 63 is disposed so as to protrude slightly toward the dirty room R <b> 1 than the filtration surface 43 a of the filter 43. The outer peripheral surface of the inner pipe 61 is in close contact with the inner peripheral surface of the through hole 43b.

  In the inside of the outer pipe 60 and the inner pipe 61, a substantially L-shaped intake flow path 64 that connects the intake inlet portion 62 and the intake outlet portion 63 is formed. The inlet pipe 45 is provided such that the extension line L of the central axis of the intake outlet 63 (intake flow path 64) intersects the bottom surface 47 a of the dirty side case 47 facing the filter 43. Specifically, the inlet pipe 45 is provided such that the extension line L is orthogonal to the bottom surface 47a.

  The inlet pipe 45 is configured such that a distance D1 between the intake outlet portion 63 and the bottom surface 47a of the dirty side case 47 is larger than the inner diameter D2 of the intake outlet portion 63 (intake flow path 64).

  As shown in FIGS. 4 and 5, the outlet pipe 46 is formed in a cylindrical shape and is disposed in parallel to the upper surface of the clean side case 48. The outlet pipe 46 is disposed on the left side of the outer pipe 60 of the inlet pipe 45. The outlet pipe 46 is connected to a position slightly shifted to the rear side from the substantially center (substantially centroid) position of the clean side case 48 (filter 43) in plan view. The outlet pipe 46 extends from the connection position toward the right rear (recessed portion 56). An exhaust outlet portion 71 is formed at the distal end portion of the outlet pipe 46 so as to face above the recessed portion 56. The outlet pipe 46 and the outer pipe 60 are arranged in parallel on the upper surface of the clean side case 48.

  As shown in FIG. 7, the outlet pipe 46 has an exhaust inlet portion 70 that opens to the top surface 48 a of the clean side case 48. Inside the outlet pipe 46, an exhaust passage 72 that connects the exhaust inlet portion 70 and the exhaust outlet portion 71 is formed.

  The assembly procedure of the secondary air cleaner 41 will be described. First, the worker houses the filter 43 in the filter housing portion 50 of the dirty side case 47. Next, the clean side case 48 is put on the dirty side case 47 from above. At this time, the inner pipe 61 is inserted into the through hole 43b, the annular protrusion 54 is fitted into the annular groove 52, and the flange portions 51 and 53 are brought into contact with each other (see FIGS. 6 and 7). The operator screws the screw B1 inserted from the flange portion 51 side into the flange portion 53 (see FIG. 6). Thereby, the cleaner case 44 is integrated.

  As shown in FIGS. 2 and 3, the assembled secondary air cleaner 41 is fixed to a mounting portion 10 b provided on the right side of the frame main tube 10. Specifically, the bolt B2 through which each case bracket 55 is inserted is screwed into the mounting portion 10b. Thereby, the secondary air cleaner 41 (cleaner case 44) is fixed to the frame main tube 10, and the filter 43 is disposed substantially parallel to the step floor 33.

  As shown in FIGS. 2 and 3, the inlet hose 40 is formed in a cylindrical shape by a flexible material such as resin. The lower end portion of the inlet hose 40 is connected to the intake inlet portion 62 of the outer pipe 60. The inlet hose 40 extends rearward and upward from the lower end portion toward the upper end portion along the right frame side tube 11. The inlet hose 40 is attached to the frame side tube 11 by an attachment band 73. The upper end surface of the inlet hose 40 is closed. A plurality of (for example, a pair of left and right) suction ports 40 a are formed through the side wall of the upper end portion of the inlet hose 40.

  The outlet hose 42 is formed in a cylindrical shape by a flexible material such as resin. A lower end portion of the outlet hose 42 is connected to an exhaust outlet portion 71 of the outlet pipe 46. The outlet hose 42 extends from the connection portion with the outlet pipe 46 to the rear upper side through the lower side of the inlet hose 40. The rear end portion of the outlet hose 42 is connected to the exhaust muffler 28 (see FIG. 2). That is, the outlet hose 42 communicates the secondary air cleaner 41 and the exhaust muffler 28 with the reed valve 25 interposed therebetween.

  Next, the operation of the secondary air supply device 5 according to this embodiment will be described.

  In the secondary air supply device 5 configured as described above, when exhaust negative pressure is generated by the operation of the engine 3, outside air is sucked from the plurality of inlets 40 a of the inlet hose 40. The air flowing through the inlet hose 40 is introduced into the dirty room R1 through the intake passage 64 of the inlet pipe 45. At this time, the air flowing out from the intake outlet 63 is blown to the bottom surface 47a of the dirty side case 47 and diffuses inside the dirty room R1. The diffused air is purified (foreign matter such as dust is removed) by passing through the filter 43 toward the clean room R2.

  Clean air (secondary air) is sent from the clean room R2 to the outlet hose 42 through the exhaust passage 72 of the outlet pipe 46. The secondary air that flows inside the outlet hose 42 is supplied to the exhaust muffler 28 via the reed valve 25. Thereby, the oxidation of the unburned gas component contained in the exhaust gas (exhaust gas) can be promoted and the exhaust gas can be purified.

  According to the secondary air cleaner 41 according to the present embodiment described above, the inlet pipe 45 so that the extension line L of the central axis of the intake outlet 63 and the bottom surface 47a (inner wall surface) of the dirty side case 47 intersect each other. Is provided. For this reason, the outside air introduced into the dirty room R1 flows out from the intake outlet 63 toward the bottom surface 47a, collides with the bottom surface 47a, and diffuses into the dirty room R1. Thereby, the air including dust can be cleaned by utilizing substantially the entire filtration surface 43a of the filter 43. That is, the performance of the filter 43 is effectively exhibited, and the cleaning efficiency can be improved. Moreover, since the filtered dust can be held in substantially the entire area of the filtration surface 43a, the life of the filter 43 can be improved. Furthermore, since the introduced air collides with the bottom surface 47a and diffuses into the dirty room R1, it is possible to secure a large area of the filtration surface 43a of the filter 43 and reduce the volume of the dirty room R1. it can. Thereby, the secondary air cleaner 41 can be formed compactly. For example, the secondary air cleaner 41 can be disposed in a narrow and flat space such as the lower side of the step floor 33.

  In addition, according to the secondary air cleaner 41 according to the present embodiment, the air that flows out from the intake outlet portion 63 collides with the opposed bottom surface 47a by making the inlet pipe 45 penetrate the filter 43. It spreads in the direction. In particular, by causing the air flowing out from the intake outlet 63 to collide with the bottom surface 47a perpendicularly, the air can be diffused substantially uniformly in all directions. Thereby, the filtration surface 43a of the filter 43 can be utilized substantially uniformly, and air can be cleaned efficiently.

  Further, according to the secondary air cleaner 41 according to the present embodiment, the distance D1 between the intake outlet portion 63 and the bottom surface 47a facing the intake outlet portion 63 is ensured to be larger than the inner diameter D2 of the intake outlet portion 63 (intake flow path 64). Thus, the flow of air that collides with the bottom surface 47a does not stagnate, and air can be diffused smoothly.

  Furthermore, according to the secondary air cleaner 41 according to the present embodiment, the secondary air cleaner 41 can be compactly formed by arranging the outlet pipe 46 and the outer pipe 60 side by side on the outer side of the cleaner case 44. Can do. Moreover, since the outlet pipe 46 and the outer pipe 60 are arranged side by side, good maintainability can be provided for the user. For example, in a state where the secondary air cleaner 41 is disposed on the vehicle, the piping work of the hoses 40 and 42 connected to the outer pipe 60 and the outlet pipe 46 can be easily performed.

  In the secondary air cleaner 41 according to the present embodiment, the inner pipe 61 (intake outlet 63) is provided at a position shifted from the center (centroid) of the clean side case 48 (filter 43). Is not limited to this. For example, the intake outlet 63 may be arranged at the center (centroid) of the filter 43. As a result, the air that has flowed out of the intake outlet 63 is easily transmitted uniformly to the filtration surface 43 a of the filter 43.

  The secondary air cleaner 41 according to the present embodiment is provided with the inlet pipe 45 (inner pipe 61) so that the extension line L of the central axis of the intake outlet 63 and the bottom surface 47a of the dirty side case 47 are orthogonal to each other. However, the present invention is not limited to this. For example, the inner pipe 61 may be provided to be inclined according to the position of the intake outlet 63 in the dirty room R1. That is, the extension line L may be inclined with respect to the bottom surface 47a. Thereby, for example, when the intake outlet 63 is provided at a position shifted from the center (centroid) of the filter 43, the air can flow out toward the wide direction of the filtration surface 43 a of the filter 43.

  In addition, although the secondary air cleaner 41 which concerns on this embodiment provided the inlet pipe 45 (inner side pipe 61) so that the filter 43 might be penetrated, this invention is not limited to this. For example, the inner pipe 61 may be disposed so as to avoid the filter 43, or the intake passage may be provided in the cleaner case 44.

  A baffle plate 80 may be further provided to guide the air flowing out from the intake outlet 63 to the filtration surface 43a of the filter 43 located away from the intake outlet 63 (see the two-dot chain line in FIG. 6). ). In this case, it is preferable that the baffle plate 80 is formed so as to expand from the intake outlet 63 toward the lower side.

  In addition, since description of embodiment of the above-mentioned this invention has described suitable embodiment in the secondary air cleaner 41 which concerns on this invention, it may attach various technically preferable restrictions. However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention is not intended to limit the content of the invention described in the claims.

1 motorcycle 2 body frame 3 engine (internal combustion engine)
41 Secondary air cleaner 43 Filter 44 Cleaner case 45 Inlet pipe 46 Outlet pipe 47a Bottom (inner wall surface)
60 Outer pipe 61 Inner pipe 63 Inlet outlet (outlet)
L Extension line R1 Dirty room R2 Clean room

Claims (2)

A secondary air cleaner for purifying air introduced from the outside in order to purify exhaust gas from an internal combustion engine,
A cleaner case having a dirty side case and a clean side case;
A filter provided to be sandwiched between the dirty side case and the clean side case;
Dirty room located on one side in the interior space of the cleaner case and defined by the filter and the dirty side case;
A clean room located on the opposite side of the dirty room in the interior space of the cleaner case and defined by the filter and the clean side case;
In the clean side case, a part of the wall facing the filter is recessed by one step to the one side,
An outer pipe provided outside the cleaner case, and an inlet pipe connected to the outer pipe and having an inner pipe provided inside the cleaner case so as to pass through the clean room and reach the dirty room;
An outlet pipe provided outside the cleaner case so as to communicate with the clean room;
In the outer pipe, an intake inlet portion is formed at a tip portion on the intake inlet side,
An intake outlet portion is formed at the tip on the intake outlet side of the inner pipe,
An exhaust outlet portion is formed at a tip portion on the exhaust outlet side of the outlet pipe,
The intake outlet portion is disposed in the dirty room, and an extension line of a central axis of the intake outlet portion is provided so as to intersect an inner wall surface of the clean side case facing the filter,
When the clean side case is viewed from a direction perpendicular to the filtration surface of the filter, the outer pipe and the outlet pipe are connected to a position shifted from the center position in the clean side case,
The outer pipe and the outlet pipe are respectively extended from the connection position with the clean side case toward the recessed portion, and the intake inlet portion and the exhaust outlet portion are formed at positions corresponding to the recessed portion, respectively. A secondary air cleaner characterized by The previous SL outlet pipe and the outer pipe, the secondary air cleaner according to claim 1, characterized in that it is parallel to juxtaposed at a position corresponding to the recessed portion.

Images