JP6638572B2 - Air cleaner intake structure - Google Patents

Description

  The present invention relates to an intake structure for an air cleaner that sucks outside air into an air cleaner.

  In Patent Literature 1, a lower part of the periphery of a seat is covered with a side cover, a storage box is provided below the seat in the side cover, and an air cleaner body is disposed near the storage box, and the front, rear, left, right, and upper and lower are enclosed. An air cleaner device for a motorcycle is disclosed in which at least a part of the drawn air suction chamber is disposed between the side cover and the storage box, and a suction port of a suction duct connected to the air cleaner body is opened in the air suction chamber. ing. This air cleaner prevents water or the like splashed from the wheels from entering the suction port of the suction duct.

JP 2004-231172 A

  However, in the above-described motorcycle air cleaner device, since the suction duct extends from the air cleaner main body to the air suction chamber arranged near the storage box, the intake resistance increases when the outside air is suctioned using the suction duct. . Further, in addition to the air cleaner main body and the suction duct, a member (a box-shaped member) constituting the air suction chamber is required, so that the number of parts increases.

  Further, in an air cleaner in which a wall member including an air filter and a lid are attached to a case body, a duct provided with an intake port in the lid is an air cleaner that is attached to and covered by the cover member. The addition increases the number of parts.

  SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-described circumstances, and has a simple structure with a small number of parts, an intake structure of an air cleaner capable of effectively preventing dust and water from entering while reducing intake resistance. Is to provide.

In the air intake structure for an air cleaner according to the present invention, an air cleaner is disposed above an engine mounted on a vehicle body frame. The air cleaner includes an air cleaner case forming a part of a clean side, and an air cleaner forming a part of a dirty side. A cap, and an air filter provided on a mating surface of the air cleaner case and the air cleaner cap to remove dust, wherein the air cleaner cap is provided with an intake port for sucking outside air into the dirty side. An intake structure for an air cleaner, wherein a recess is provided in a front portion of the air cleaner cap, and the intake is positioned in the recess, and the recess is configured such that a front and an upper side of a vehicle are open to the intake. is, in the air cleaner case, the wall portion before covering the front of the intake port Wherein is extended to the front portion of the air cleaner cap, and is characterized in that it has been configured is installed in and separated with respect to distance the intake port in the vehicle longitudinal direction of depth of the same dimension of the recess.

  ADVANTAGE OF THE INVENTION According to this invention, since the intake structure of an air cleaner can be comprised by a simple structure by an air cleaner only, the number of parts and assembly man-hours of an air cleaner can be reduced, Furthermore, the intake structure influences or gives the air cleaner peripheral parts. Nor. Further, the member including the intake port is not lengthened to the vicinity of other components, and a front wall portion covering the front of the intake port is installed at a certain distance from the intake port. For these reasons, the intake resistance of the intake structure can be reduced. Further, since the front wall blocks dust and water from the front of the vehicle at the intake port, it is possible to effectively prevent dust and water from entering the air cleaner.

1 is a left side view showing a scooter type motorcycle to which an embodiment of an air cleaner intake structure according to the present invention is applied. FIG. 2 is a left side view showing a body frame, a unit swing type engine, an engine intake system and the like in the scooter type motorcycle of FIG. 1. FIG. 3 is a perspective view showing the air cleaner of FIGS. 1 and 2. FIG. 4 is a perspective view showing the air cleaner case of FIG. 3 and a partition wall provided with an air filter. FIG. 4 is a perspective view showing the first half of the air cleaner cap and the like in FIG. 3. VI perspective view of FIG. FIG. 4 is a partial left side view showing the first half of the air cleaner of FIG. 3. FIG. 8 is a view taken in the direction of arrow VIII in FIG. 7. The IX arrow line view of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a left side view showing a scooter type motorcycle to which an embodiment of an air cleaner intake structure according to the present invention is applied. FIG. 2 is a left side view showing a body frame, a unit swing type engine, an engine intake system and the like in the scooter type motorcycle of FIG. In the present embodiment, the expressions of front and rear, left and right, and up and down are based on the occupant at the time of boarding the vehicle, particularly the driver.

  As shown in FIGS. 1 and 2, a scooter-type motorcycle 10 as a scooter-type vehicle includes an underbone-type body frame 11. In the body frame 11, one down tube 13 made of a steel pipe extends rearward and downward from the rear of the head pipe 12 at the front of the head, and a pair of left and right under frames 14 extends rearward from the lower portion of the down tube 13. A pair of left and right seat rails 15 are integrally connected to the rear end of the under frame 14. The seat rail 15 is formed to extend upward from the rear end of the under frame 14 and then extend obliquely upward to the rear.

  A pair of left and right bottom rails 16 extend rearward from the lower end of the down tube 13 substantially in parallel with the underframe 14, and the rear portion of the bottom rail 16 bends upward and extends to form a rear end of the underframe 14. Linked to A reinforcing plate 17 is fixed at a position where the underframe 14, the seat rail 15, and the bottom rail 16 intersect. A bridge member 18 extends between the pair of left and right underframes 14 and the seat rails 15 in the vehicle width direction.

  A front fork 20 is supported by the head pipe 12 so as to be rotatable left and right together with a handle bar 21, and a front wheel 22 is pivotally supported at a lower end of the front fork 20. On the other hand, a unit swing type engine 24 is pivotally supported on the reinforcing plate 17 at the center lower portion of the body frame 11 via an engine suspension bracket 23 so as to be able to swing around a pivot axis O in the vertical direction of the vehicle.

  The unit swing type engine 24 is generally used for a scooter. The engine 25 and a transmission 26 are integrally formed, and a rear wheel 27 is directly supported on a rear portion of the transmission 26. The transmission 26 includes, for example, a continuously variable transmission that changes the output of the engine 25 to a predetermined rotation speed. A rear cushion unit 28 is bridged between the rear part of the transmission 26 and the seat rail 15. By this reaction unit 28, the swinging of the unit swing type engine 24 and the rear wheel 27 in the vehicle vertical direction is buffered and suspended.

  Above the seat rail 15 in the body frame 11, a seat 30 is provided to be openable and closable. An article storage box 31 capable of storing a helmet or the like is arranged below the seating seat 30 and above the unit swing type engine 24. A fuel tank (not shown) is disposed behind the article storage box 31. The article storage box 31 and the fuel tank are supported by a pair of left and right seat rails 15. Further, the article storage box 31 and the fuel tank 31 are joined to the front of the unit swing type engine 24, the front half of an engine intake system 40 (described later) and the body frame 11 by a frame cover 32 made of synthetic resin. The frame cover 32 improves the appearance of the vehicle.

  The engine 25 has a cylinder assembly 34 projecting from the front of the crankcase 33 so as to be inclined forward in a substantially horizontal direction. A transmission casing 35 of the transmission 26 is integrally provided on the left side of the crankcase 33 and extends rearward of the vehicle. The cylinder assembly 34 is configured by sequentially joining a cylinder block 36, a cylinder head 37, and a head cover 38 from the crankcase 33 side.

  A piston (both not shown) is slidably disposed in the cylinder of the cylinder block 36, and the piston is connected to a crankshaft 39 rotatably disposed in the crankcase 33 via a connecting rod (not shown). Be linked. The reciprocating linear motion of the piston is converted into a rotational motion of the crankshaft 39 by the connecting rod.

  A combustion chamber (not shown) communicating with the cylinder of the cylinder block 36 is formed in the cylinder head 37, and an intake port and an exhaust port (both not shown) are formed in communication with the combustion chamber. An air-fuel mixture from an engine intake system 40, which will be described later, is supplied to the combustion chamber via an intake port, and the air-fuel mixture burns, whereby the piston reciprocates and the crankshaft 39 rotates. The rotational force of the crankshaft 39 is shifted by the transmission 26 to drive the rear wheels 27.

  The engine intake system 40 generates a mixture of fuel and air, and supplies the mixture to the intake port of the cylinder head 37. The engine intake system 40 is disposed above the unit swing type engine 24 and connected to the intake port. You. The engine intake system 40 includes an intake pipe 41, a throttle body 42, an air cleaner 43, and a fuel injector 44.

  The intake pipe 41 is connected to an intake port of the cylinder head 37 and a throttle body 42, and the throttle body 42 is connected to an air cleaner 43 via an outlet pipe 45. The clean air from which dust and the like have been removed by the air cleaner 43 is guided to the throttle body 42. The throttle body 42 includes a throttle valve (not shown) for opening and closing an intake passage formed therein, and adjusts the flow rate of air supplied to the intake port via the intake pipe 41 in accordance with the opening of the throttle valve. .

  The fuel injector 44 is installed in, for example, the intake pipe 41. The fuel injector 44 injects fuel toward the intake port into the air flowing through the intake pipe 41 to generate an air-fuel mixture, and supplies the air-fuel mixture to the intake port of the cylinder head 37 via the intake pipe 41. I do. The engine intake system 40 replaces the throttle body 42 and the fuel injector 44 with a carburetor, adjusts the amount of air supplied to the intake port according to the opening of the throttle valve of the carburetor, and reduces the amount of fuel atomization. The air-fuel mixture may be supplied to the intake port of the cylinder head 37 with adjustment.

  An exhaust pipe 46 is connected to an exhaust port (not shown) of the cylinder head 37. The exhaust pipe 46 extends rearward of the vehicle, and an exhaust muffler 47 is connected to a rear end of the exhaust pipe 46 to form an engine exhaust system 48. The engine exhaust system 48 discharges exhaust gas generated by combustion of the air-fuel mixture in the combustion chamber of the engine 25 from an exhaust muffler 47 to the atmosphere via an exhaust pipe 46.

  Incidentally, the air cleaner 43 of the engine intake system 40 is installed on the upper surface of the transmission casing 35 of the transmission 26 in the unit swing type engine 24. Accordingly, similarly to the engine exhaust system 48, the engine intake system 40 swings in the vertical direction of the vehicle around the pivot axis O via the engine suspension bracket 23 together with the unit swing type engine 24.

  As shown in FIGS. 3 and 4, the air cleaner 43 includes an air cleaner case 51 that forms a part of the clean side 50A, an air cleaner cap 52 that forms a part of the dirty side 50B, an air cleaner case 51, and an air cleaner cap 52. And an intake pipe 55 inserted into the air cleaner cap 52 and installed. In the present embodiment, the clean side 50A is located inside the vehicle, and the dirty side 50B is located outside the vehicle.

  The clean side 50A is configured to be surrounded by an air cleaner case 51, a partition wall 53, and an air filter 54. The dirty side 50B is configured to be surrounded by the air cleaner cap 52, the partition wall 53, and the air filter 54. The opening end of the intake pipe 55 installed on the air cleaner cap 52 located outside the air cleaner cap 52 serves as an intake port 55A. Inlet pipe 55 draws in outside air from inlet port 55A and guides the outside air into dirty side 50B. The outside air guided into the dirty side 50B is cleaned of dust and the like while passing through the air filter 54, flows into the clean side 50A, and is guided to the throttle body 42 via the outlet pipe 45.

  Here, the inlet pipe 55 including the above-described intake port 55 </ b> A, the concave portion 56 of the air cleaner cap 52 described below, and the front wall portion 60 of the air cleaner case 51 are provided with an air cleaner intake structure for preventing dust and water from entering the air cleaner 43. 49.

  As shown in FIGS. 5 to 7, a concave portion 56 is provided at a front portion of the air cleaner cap 52, and an inlet pipe 55 is inserted into the concave portion 56, and an intake port 55 </ b> A of the inlet pipe 55 is positioned in the concave portion 56. The concave portion 56 of the air cleaner cap 52 is formed by a lower wall surface 57 and opposite side wall surfaces 58 and 59. Since the lower wall surface 57 and the side wall surfaces 58 and 59 surround the intake port 55A of the inlet pipe 55, the concave portion 56 is configured such that the vehicle front and the vehicle upper side are open with respect to the intake port 55A.

  Further, as shown in FIG. 6, the inlet 55A of the inlet pipe 55 has an elliptical shape that is vertically long in the vehicle vertical direction, that is, an elliptical shape having the vehicle vertical direction as the long axis N direction. Dimensions are reduced. 1 and 7, the inlet 55A of the inlet pipe 55 is configured to overlap the frame cover 32 that covers the vehicle body frame 11 and the like from the side of the vehicle when viewed from the side of the vehicle. 32.

  As shown in FIGS. 3 and 4, in the air cleaner case 51, a front wall portion 60 that covers the front of the intake port 55 </ b> A of the inlet pipe 55 extends to a front portion of the air cleaner cap 52. As shown in FIGS. 8 and 9, the front wall portion 60 is longer in the vehicle vertical direction than the long axis N of the inlet 55A of the inlet pipe 55, and in the vehicle width direction than the short axis M of the inlet 55A. Set long. Further, the end face 61 in the vehicle width direction of the front wall portion 60 is set at substantially the same position as the side wall face 59 of the air cleaner cap 52. Therefore, the inlet port 55A of the inlet pipe 55 is covered by the front wall portion 60 at a distance L (described later) in the vehicle front direction, and dust and water from the vehicle front direction are protected by the front wall portion 60. Blocked.

  Further, the front wall portion 60 of the air cleaner case 51 extends parallel to the vehicle width direction up to the front portion of the air cleaner cap 52 as shown in FIGS. As a result, the distance L between the intake port 55A of the inlet pipe 55 and the front wall portion 60 is set to be substantially the same as the depth T of the recess 56 in the air cleaner cap 52 in the vehicle longitudinal direction. Therefore, the space A facing the air inlet 55A of the inlet pipe 55, which is surrounded by the front wall portion 60, the lower wall surface 57 forming the concave portion 56, and the side wall surfaces 58 and 59, is a space open above the vehicle. . Therefore, the air inlet 55A of the inlet pipe 55 sucks air from above the vehicle through the space A.

  As shown in FIGS. 3 and 7, the front wall portion 60 of the air cleaner case 51 has a curved surface 63 that substantially conforms to the shape of the curved surface 62 at the front portion of the air cleaner cap 52 and curves toward the rear of the vehicle. It is formed in a shape. On the other hand, as shown in FIG. 2, an air duct 64 for introducing cooling air into the transmission 26 of the unit swing type engine 24 is provided in front of the air cleaner 43 in the vehicle from the transmission 26 behind the article storage box 31. It extends to the lower part and is fixed to the seat rail 15. The air cleaner 43 swings around the pivot axis O via the engine suspension bracket 23 together with the unit swing type engine 24. During the swinging, when the air cleaner 43 and the unit swing type engine 24 move in the direction of contracting the rear cushion unit 28, the front wall 60 of the air cleaner 43 has a curved surface 63 whose air cleaner 43 includes an air duct 64. By sequentially contacting the peripheral parts, the impact force acting on the peripheral parts is reduced.

With the configuration described above, according to the present embodiment, the following effects (1) to (6) can be obtained.
(1) As shown in FIGS. 3 to 5, the concave portion 56 of the air cleaner cap 52 in which the intake port 55 </ b> A of the inlet pipe 55 is located is formed by a lower wall surface 57 and both side wall surfaces 58 and 59. Therefore, dust and water from below the vehicle and from both sides of the vehicle with respect to the intake port 55A are blocked by the portion (including the lower wall surface 57, the side wall surfaces 58 and 59) of the air cleaner cap 52 including the concave portion 56. Further, a front wall portion 60 of the air cleaner case 51 is positioned in front of the intake port 55A of the inlet pipe 55 and covers the intake port 55A. Blocked by From these facts, the recess 56 of the air cleaner cap 52 and the front wall 60 of the air cleaner case 51 that constitute the intake structure 49 of the air cleaner 43 can effectively prevent dust and water from entering the air cleaner 43.

  (2) Since the concave portion 56 where the intake port 55A of the inlet pipe 55 is located is provided in the air cleaner cap 52, and the front wall portion 60 which covers the intake port 55A of the inlet pipe 55 from the front is provided in the air cleaner case 51, the intake of the air cleaner is performed. The structure 49 can be configured as a simple structure with the air cleaner 43 alone. As described above, since the intake structure 49 of the air cleaner includes only the air cleaner case 51, the air cleaner cap 52, and the inlet pipe 55 which are the components of the air cleaner 43, the number of parts and the number of assembling steps of the air cleaner 43 can be reduced. Furthermore, the air cleaner intake structure 49 does not affect or affect the air cleaner peripheral components.

  (3) As shown in FIGS. 3 and 7, the concave portion 56 of the air cleaner cap 52 where the intake port 55A of the inlet pipe 55 is located is open forward and upward from the intake port 55A. Further, the front wall portion 60 of the air cleaner case 51 that covers the front of the intake port 55A of the inlet pipe 55 is provided at the intake port 55A by a distance L having substantially the same dimension as the depth T of the concave portion 56 of the air cleaner cap 52 in the vehicle longitudinal direction. It is located far away from. Therefore, the intake port 55A of the inlet pipe 55 can inhale outside air through the space A, which is surrounded by the concave portion 56 of the air cleaner cap 52 and the front wall portion 60 of the air cleaner case 51 and is open at the upper side of the vehicle, so that the air at the time of the suction can be obtained. Inhalation resistance can be reduced.

  Further, since the inlet pipe 55 including the air inlet 55A is not elongated from the air cleaner 43 to, for example, the article storage box 31, the air inlet 55A of the inlet pipe 55 is positioned in the concave portion 56 of the air cleaner cap 52. Inhalation resistance during inhalation can be reduced.

  (4) The front wall portion 60 of the air cleaner case 51 extending to the front surface portion of the air cleaner cap 52 conforms to the shape of the curved surface 62 of the front surface portion of the air cleaner cap 52 to form a curved surface 63 that curves toward the rear of the vehicle. It is formed in the shape which has. For this reason, it is possible to avoid an increase in the size of the air cleaner 43 including the front wall portion 60. Furthermore, when the air cleaner 43 swings around the pivot axis O together with the unit swing engine 24, even if the front wall portion 60 collides with a peripheral component of the air cleaner 43 (for example, the air duct 64 of the transmission 26), the peripheral component is , The impact force on the peripheral components is reduced, and the peripheral components can be prevented from being damaged.

  (5) As shown in FIG. 6, the intake port 55A of the inlet pipe 55 is formed in an elliptical shape having the longitudinal direction of the vehicle as the major axis N. For this reason, both side wall surfaces 58 and 59 of the concave portion 56 in which the intake port 55A is located can be formed in, for example, a linear shape parallel to the vehicle vertical direction. As a result, the size of the air cleaner cap 52 in which the inlet pipe 55 is installed in the vehicle width direction can be suppressed, and the appearance of the air cleaner 43 can be improved.

  (6) As shown in FIGS. 1 and 7, the intake port 55A of the inlet pipe 55 installed in the air cleaner cap 52 overlaps with the frame cover 32 that covers the body frame 11 and the like from the side of the vehicle. It is configured to be covered by a frame cover 32. Therefore, suction of dust and water from the inlet port 55A of the inlet pipe 55 can be further prevented by the frame cover 32.

  Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. , And are included in the scope and spirit of the invention, and are also included in the invention described in the claims and their equivalents.

  For example, in the present embodiment, the air cleaner 43 installed on the unit swing type engine 24 that is swingably supported with respect to the body frame 11 has been described, but the air cleaner 43 fixed to the body frame 11 together with the engine is also described. Alternatively, the intake structure 49 of the air cleaner of the present invention may be applied.

  DESCRIPTION OF SYMBOLS 10 ... Scooter type motorcycle, 11 ... Body frame, 24 ... Unit swing type engine, 25 ... Engine, 26 ... Transmission, 32 ... Frame cover, 43 ... Air cleaner, 49 ... Air cleaner intake structure, 50A ... Clean side, 50B ... Dirty side, 51 ... Air cleaner case, 52 ... Air cleaner cap, 54 ... Air filter, 55 ... Inlet pipe, 55A ... Inlet, 56 ... Concave, 60 ... Front wall, 62, 63 ... Curved surface, N ... Long axis .

Claims (4)

An air cleaner is disposed above an engine mounted on the body frame. The air cleaner includes an air cleaner case that forms a part of a clean side, an air cleaner cap that forms a part of a dirty side, the air cleaner case, and the air cleaner cap. And an air filter provided on the mating surface for removing dust.
The air cleaner cap has an intake structure of an air cleaner provided with an intake port for sucking outside air into the dirty side,
A concave portion is provided in a front surface portion of the air cleaner cap, and the intake port is positioned in the concave portion,
The recess is configured such that the front and the top of the vehicle are open to the intake port,
In the air cleaner case, a front wall portion that covers the front of the intake port is extended to the front surface portion of the air cleaner cap , and a distance of the same dimension as a depth of the concave portion in a vehicle longitudinal direction with respect to the intake port. The intake structure of an air cleaner characterized by being installed at a distance . The engine constitutes a unit swing type engine that is integrated with the transmission and swingably supported by the body frame, and an air cleaner is installed on an upper surface of the unit swing type engine,
Intake structure of an air cleaner according to claim 1, the front wall portion of the air cleaner case in the air cleaner, characterized in that it is formed in a curved shape adapted to the shape of the air cleaner. The intake port provided in the air cleaner cap, intake structure of an air cleaner according to claim 1 or 2, characterized in that it is formed into an elliptic shape that the vehicle vertical direction and longitudinal direction. The air cleaner according to any one of claims 1 to 3 , wherein an intake port provided in the air cleaner cap is configured to overlap with a frame cover that covers a vehicle body frame from a side of the vehicle when viewed from the side of the vehicle. Intake structure.

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