JP4964618B2 - Air intake duct - Google Patents

Description

  The present invention relates to an intake duct used for, for example, a motorcycle.

For example, in a motorcycle or the like, an air cleaner box is provided to take in intake air. This air cleaner box is provided with a filter inside, and the intake air is supplied to the engine with the dust removed through the filter (see Patent Document 1).
In addition, in order to take in the intake air in this way, there is one that effectively uses the closed cross-section structure portion in the stay of the front cowl (see Patent Document 2).
Japanese Patent No. 3552690 Japanese Utility Model Publication No. 62-36706

  However, the above prior art is advantageous in that dust in the intake air can be removed by a filter in the air cleaner box and clean air can be introduced into the engine. Since the flow rate of the intake air is reduced, the intake load applied to the engine is increased by this amount.

  In view of the above, an object of the present invention is to provide an intake duct that can reduce the load applied to the engine without reducing the flow velocity of the intake air to the engine as much as possible.

In order to achieve the above object, the invention described in claim 1 is characterized in that the air intakes (25, 26) that open toward the front of the vehicle at the front portion of the front cowl (21) of the saddle-ride type vehicle (1 ) are left and right. a pair of formed, the front end opening portion of the head pipe (2) a pair of left and right air ducts (27, 28) arranged on the side of the (29, 30) are connected to these air intake (25, 26), wherein A bracket B for integrally fixing the air ducts (27, 28) is attached to the front end openings (29, 30) so as to surround the front end openings (29, 30). is fixed to the vehicle body, is arranged between the air duct (27, 28) is the body frame through the through holes of the branched body frame in the lateral direction (7, 8) (38, 38) from the head pipe (2) Connected to the air box portion (33), wherein each of the air inlet the running wind introduced from (25, 26) each air duct (27, 28), through said air box portion (33) engine (9 ) the intake duct structure incorporating into, the filters (54) to said each air duct leading to the air box portion (33) (27, 28) within the respective air inlet (25, 26) is provided, each The dirty side (D) of each of the air ducts (27, 28) from the air intake (25, 26) to the filter (54) is directed toward the filter (54) at least in the vicinity of the filter (54). The passage sectional area is set so as to gradually increase, and the air ducts (27, 28) from the filter (54) to the air box (33) are cleaned. The side side (C) is set so that the passage cross-sectional area gradually decreases toward the air box part (33) at least in the vicinity of the filter (54), and each of the vehicle body frames (7, 8). Each of the air ducts (27, 28) is configured to be divided between the through holes (38, 38) so that the dirty side (D) and the clean side (C) can be divided. The filter (54) is interposed at a joint portion between the side (D) and the clean side (C) .
By comprising in this way, compared with the case where a filter is provided in the air box part, the air volume on the clean side of the air duct downstream from the filter can be secured and the clean side can be secured longer.
In addition, the filtration resistance can be reduced by ensuring a large filtration area of the filter.
Further, the filter can be removed by dividing the dirty side and clean side of the air duct.

The invention described in claim 2 is characterized in that a discharge port (64) is provided in a lower part of the dirty side (D) of the air duct (27, 28) .
By comprising in this way, the water and dust which accumulate on the dirty side side of an air duct can be removed from a discharge port.
According to a third aspect of the present invention, the dirty side (D) and the clean side (C) of each air duct (27, 28) are on the lower side, and both tongue pieces (57, 58) are screws (59) on the lower side. ), And on the upper side, the hooks (61, 61) are fixed by a fixture (62).

According to the first and third aspects of the invention, the air volume on the clean side of the intake passage on the downstream side of the filter can be secured and the clean side can be secured compared to the case where the filter is provided in the air box portion. Since it can be secured for a long time, there is an effect that the intake air flow rate can be increased to reduce the load on the engine during intake.
Further , since the filtration resistance can be reduced by securing a large filtration area of the filter, there is an effect that the load applied to the engine can be reduced.
Furthermore , since the filter can be removed by dividing the dirty side and clean side of the air duct, there is an effect that the replacement work of the filter becomes easy.
According to the invention described in claim 2 , since water and dust accumulated on the dirty side of the air duct can be removed from the discharge port, there is an effect that maintenance is easily performed.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, a front fork 3 is steerably connected to the head pipe 2 of the motorcycle 1, and a front wheel 4 is attached to the lower end of the front fork 3. A pair of left and right bar handles 5 and 6 are attached to the upper end of the front fork 3. A main frame 7, 8 branched to the left and right at the rear is connected to the head pipe 2, and a V-type 2-cylinder engine 9 with a transmission is attached to the lower part of the main frames 7, 8. Yes. A radiator 10 is disposed in front of the engine 9, and a swing arm 12 is attached to a rear portion of the lower part of the pair of left and right main frames 7 and 8 via a pivot shaft 11 so as to swing up and down. A rear wheel 13 is attached to the rear end of the swing arm 12. The front part of the vehicle body and the lower part of the vehicle body are covered with the cowling 14.

A front fender 15 is provided above the front wheel 4 to cover it. A windshield 16 is attached to the upper part of the front portion of the cowling 14. A seat cowl 17 is provided above the main frames 7 and 8. Reference numeral 18 denotes a seat, 19 denotes a fuel tank, and 20 denotes a rear fender that covers the rear wheel 13 from above.
Here, the cowling 14 includes a front cowl 21 that covers the front of the bar handles 5 and 6, the front and both sides of the front fork 3, both sides of the front fork 3, both sides of the radiator 10, and both sides of the front of the engine 9. A middle cowl 22 attached to the lower part of the front cowl 21 to cover the front side, an inner cowl 23 attached to the rear part of the middle cowl 22 and the engine 9 to cover both sides of the engine 9, and both sides of the lower part of the vehicle body and the lower part of the vehicle body The lower cowl 24 is attached to the lower part of the middle cowl 22 and the lower parts of the main frames 7 and 8 to cover the lower part of the middle cowl 22.

  At the front end of the front cowl 21, a pair of left and right air intakes 25, 26 opening toward the front of the vehicle are formed. The air inlets 25 and 26 are connected to front end openings 29 and 30 of a pair of left and right air ducts 27 and 28 formed of resin or the like. A bracket B for integrally fixing the air ducts 27 and 28 is attached to the front end openings 29 and 30 so as to surround the front end openings 29 and 30, and is provided at an upper portion of the bracket B. The tongue-like piece 66 is fixed to a vehicle body (including a frame and a cowl) with a screw 67.

As shown in FIGS. 3 and 4, the air ducts 27 and 28 are arranged slightly below the side of the head pipe 2, and the front ducts 31 extending from the front end openings 29 and 30 to the main frames 7 and 8, 32, rear ducts 36 and 37 from the main frames 7 and 8 to the opening 35 of the front wall 34 of the air box 33, and the front and rear walls of the main frames 7 and 8 inside the main frames 7 and 8. It is divided into an inner duct 39 (the main frames 7 and 8 are omitted in FIG. 4) penetrating through the openings 38 and 38. Such a division configuration facilitates assembly. FR denotes the front side of the vehicle (the same applies hereinafter).
Here, the air box portion 33 is disposed between the main frames 7 and 8 and communicates with the front air ducts 27 and 28 and the intake port of the rear engine 9. A recess 41 is formed on the upper wall 40 of the air box portion 33 on the front side, and an ECU (engine control unit) 42 is disposed so as to be accommodated in the recess 41. Further, the connectors 44 of the harness 43 connected to the ECU 42 are integrally formed on the front side of the upper wall 40 of the air box portion 33 by insert molding. Further, the connectors 46 of the fuel system pipe 45 are also integrally formed on the left side of the upper wall 40 of the air box portion 33 (described only in FIG. 3) by insert molding.
A fuel tank 19 is disposed behind the air box 33.

  Specifically, as shown in FIGS. 5 and 6, in the rear ends of the front ducts 31 and 32 in which the front end openings 29 and 30 are connected to the air intakes 25 and 26 of the front cowl 21 (see FIG. 2). A locking ring portion 47 is joined to the periphery. A receiving portion 49 is formed by the locking ring portion 47 and the rear end outer peripheral edge 48. The receiving portion 49 receives the front end portion 50 of the inner duct 39 inserted so as to pass through the openings 38 and 38 between the front and rear walls of the main frames 7 and 8.

Further, the front end portions of the rear ducts 36 and 37 are inserted and fixed in the rear end portion 50 ′ of the inner duct 39 (see FIG. 6). The rear ducts 36 and 37 have a shorter length toward the outer side in the vehicle width direction, and a stopper piece 51 serving as an insertion restriction and a seal is formed on the entire outer periphery of the front end portion. An annular locking recess 52 is formed over the entire circumference at the rear ends of the rear ducts 36 and 37, and this locking recess 52 is formed on the periphery of the opening 35 of the front wall 34 of the air box 33. The locking portion 53 is locked.
Therefore, the traveling wind introduced from the air intakes 25 and 26 of the front cowl 21 is the air ducts 27 and 28, that is, the front ducts 31 and 32, the inner duct 39 in the main frames 7 and 8, and the intake passage K in the rear ducts 36 and 37. And is taken into the engine 9 as combustion air from the air box portion 33.

As shown in FIGS. 7 to 9, the front ducts 31 and 32 of the air ducts 27 and 28 (hereinafter described only on the side of the front duct 31) are formed so as to be divided into front and rear parts, and a filter 54 is interposed at the joint portion. ing.
As shown in FIG. 8, the front duct 31 is curved outward and formed in a substantially uniform width in a plan view, but the portion where the filter 54 is interposed is enlarged in the side view shown in FIG. 7. It has a cross-sectional shape. In other words, the dirty side D of the front duct 31 from the front end opening 29 to the filter 54 is set so that the passage cross-sectional area gradually increases toward the filter 54 so that the lower side is lowered in the vicinity of the filter 54. The clean side C of the front duct 31 extending from the filter 54 to the main frame 7 is set in the vicinity of the filter 54 so as to rise toward the main frame 7 but suddenly gradually reduce the passage cross-sectional area. Accordingly, in FIG. 9, the front ducts 31 and 32 are shaped so as to be lowered slightly outward from the front end opening 29 in a front view.

An annular storage portion 55 is formed inside the peripheral flange 68 at the rear end portion of the dirty side D of the front duct 31 and the front end portion of the clean side C. An annular sealing material 56 having a circular cross section (or may have a square cross section) is attached to the storage portion 55. At the rear end of the dirty side D of the front duct 31 and at the front end of the clean side C, tongue pieces 57 and 58 are respectively formed at the lower part, and both tongue pieces 57 and 58 are fixed by screws 59. ing. In addition, hooks 60 and 61 that are curved away from each other are disposed on the upper wall at the rear end portion of the dirty side D of the front duct 31 and the front end portion of the clean side C. It is fixed by. A string-like fixture 62 (see FIG. 8) is wound around these hooks 60 and 61.
Therefore, the dirty side D and the clean side C of the front duct 31 are fixed by the screws 59 with the tongue pieces 57 and 58 on the lower side, and the hooks 60 and 61 are fixed by the fixing tool 62 on the upper side.

  A ring-shaped retainer 63 is attached to the periphery of the filter 54, and the front and rear ends of the retainer 63 are in close contact with the sealing material 56. The rear end periphery of the dirty side D and the clean side are disposed on the front and rear surfaces of the filter 54. The peripheral edge of the front end of the side C is brought close to each other, and the rear end part of the dirty side D of the front ducts 31 and 32 and the front end part of the clean side C are fixed with a filter 54 therebetween.

  Here, a discharge port 64 is formed in a lower portion of the rear end portion of the dirty side D of the front ducts 31 and 32, and a plug 65 for closing the discharge port 64 is detachably attached thereto.

According to the above embodiment, the traveling wind introduced from the air intakes 25 and 26 of the front cowl 21 is the front ducts 31 and 32 of the air ducts 27 and 28, the inner duct 39 in the main frames 7 and 8, and the rear ducts 36 and 37. The air flows through the intake passage K and is taken into the engine 9 from the air box 33 as combustion air. During this time, the dust contained in the traveling wind is collected by the filter 54, so that the flow velocity of the intake air temporarily decreases in the filter 54, but from the clean side C of the front ducts 31 and 32 to the inner duct 39 and the rear duct 36. , 37, the flow velocity is increased and the air box 33 is smoothly supplied to the engine 9 in a clean state.
Therefore, as compared with the case where the filter 54 is provided in the air box portion 33, the air volume of the intake passage K on the clean side C, which is downstream of the filter 54, can be secured and the intake passage K of the clean side C can be secured. Since the length can be secured long, the flow rate of the intake air can be increased, and the load on the engine 9 during intake can be reduced.

  Further, the intake passage K on the dirty side D of the front ducts 31 and 32 from the air intakes 25 and 26 to the filter 54 is gradually increased toward the filter 54 at least in the vicinity of the filter 54. The intake passage K on the clean side C of the front ducts 31 and 32 from the filter 54 to the air box portion 33 is gradually reduced toward the air box portion 33 at least near the filter 54. Since the filter 54 is interposed at the junction between the dirty side D and the clean side C of the front ducts 31 and 32, the filter 54 has a large filtration area to reduce the filtration resistance. be able to. Therefore, the load given to the engine 9 can be reduced also in this respect.

  The dirty side D and the clean side C of the front ducts 31 and 23 are separated by removing the fixture 62 and the screw 59, and the dirty side D and clean side C of the front ducts 31 and 32 are divided. Thus, the filter 54 can be easily removed. Therefore, the replacement work of the filter 54 becomes easy.

Further, water and dust that cannot be collected by the filter 54 are efficiently accumulated on the lower side of the dirty side D of the front ducts 31 and 32 formed so that the cross-sectional area of the passage extends downward, and the plug 65 can be removed. Since it can be easily removed from the discharge port 64, maintenance is easy.
The present invention is not limited to the above-described embodiment. For example, the case where the discharge port is closed with a plug has been described, but a structure in which the plug is eliminated and the discharge port is always opened may be employed.
In this embodiment, the intake duct for the V-type two-cylinder engine has been described. However, the engine type is not limited to this. Further, the case where the connectors 44 are integrally formed by insert molding on the front side of the upper wall 40 of the air box portion 33 has been described as an example, but the method of molding and attachment is an example and is not limited thereto. Absent.
The description has been given of the case where the string-like fixing device 62 is attached to the hooks 60, 61. However, the member to be locked is not limited to the string shape, and various members such as a rubber band can be used as long as the members can be locked to the hooks 60, 61. Can be used.
Furthermore, in this embodiment, a motorcycle is described as an example of a saddle-ride type vehicle. However, as long as a head pipe is provided at the front portion of the body frame, the motorcycle is not limited to a motorcycle, and can be applied to a three-wheeled vehicle or a four-wheeled vehicle. In addition, the present invention can also be applied to a scooter vehicle having a footrest portion.

1 is a side explanatory view of a motorcycle according to an embodiment of the present invention. It is front explanatory drawing of FIG. FIG. 2 is a partial plan view of FIG. 1. It is a perspective view of an air duct and an air box part which omitted a main frame of an embodiment of this invention. It is a fragmentary perspective view of the surroundings of the main frame which shows the state which removed the cowling of embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a side view of a front duct. FIG. 8 is a plan view of FIG. 7. It is a partial front view of FIG.

Explanation of symbols

1 Motorcycle (saddle-ride type vehicle)
2 Headpipe 7, 8 Main frame (body frame)
9 Engine 21 Front cowl 25, 26 Air intake 27, 28 Air duct 33 Air box 38 Opening (through hole)
54 Filter 64 Discharge port C Clean side D D Dirty side K Intake passage

Claims (3)

A pair of left and right air intakes (25, 26) opening toward the front of the vehicle are provided at the front of the front cowl (21) of the saddle-ride type vehicle (1) , and head pipes are provided at these air intakes (25, 26). (2) the front end opening of the disposed beside the pair of left and right air ducts (27, 28) (29, 30) is connected to the said front end opening of the air duct (27, 28) (29, 30) A bracket B for fixing them integrally is attached so as to surround the front end opening (29, 30), this bracket is fixed to the vehicle body, and the air duct (27, 28) is connected to the head pipe ( is connected to the air box portion disposed between the body frame through the through holes (38, 38) of the vehicle body frame branching in the lateral direction 2) (7,8) (33), wherein each air intake The traveling wind introduced from (25, 26) each air duct (27, 28), wherein an intake duct structure incorporating into the engine through the air box portion (33) (9), wherein each air inlet ( 25, 26) to each of the air ducts (27, 28 ) from the air box section (33) to the filter (54) , and from each of the air intakes (25, 26) to the filter (54). The dirty side (D) of each of the air ducts (27, 28) is set so that the passage cross-sectional area gradually increases toward the filter (54) at least in the vicinity of the filter (54). 54) to the air box part (33), the clean side (C) of each air duct (27, 28) is at least near the filter (54). The sectional area is set so that the passage cross-sectional area gradually decreases toward the air box portion (33), and is divided with the through holes (38, 38) of the vehicle body frames (7, 8) interposed therebetween. The dirty side (D) and the clean side (C) of each of the air ducts (27, 28) can be divided, and the dirty side (D) and the clean side (C) The air intake duct is characterized in that the filter (54) is interposed at a joint portion of the air intake. The intake duct according to claim 1 , wherein a discharge port (64) is provided at a lower part of the dirty side (D) of the air duct (27, 28) . The dirty side (D) and the clean side (C) of each air duct (27, 28) are fixed to the tongues (57, 58) by screws (59) on the lower side, and hooks ( The intake duct according to claim 1 or 2, wherein 61, 61) are fixed by a fixture (62).

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