Saddle-type vehicle

Abstract

A saddle-type vehicle according to the present invention comprises: a front wheel and a rear wheel; an engine which is disposed between the front wheel and the rear wheel such that a cylinder axial line is directed toward the front wheel, and which outputs a rotational driving force of the rear wheel; a head pipe which supports a steering mechanism of the front wheel; and an air cleaner which supplies purified air to the engine. The air cleaner comprises: a cleaner box; and a first duct, a second duct, and a third duct that are connected to the cleaner box and introduce outside air into the cleaner box. Further, the air cleaner is disposed between the head pipe and the engine below the head pipe.

Description

Saddle-type vehicle

[0001] The present invention relates to a saddle-ride type vehicle.

[0002] In straddle-type vehicles, increasing the amount of intake air to the engine is one way to improve drivability in the low- and medium-speed ranges. To achieve this, methods include increasing the capacity of the air cleaner that purifies the engine's intake air, or increasing the passage diameter of the duct on the intake side of the air cleaner to improve intake efficiency. Alternatively, providing multiple ducts on the intake side has also been proposed, as disclosed in Patent Documents 1 and 2.

[0003] JP 2021-46028 A JP 2015-68221 A

[0004] However, increasing the capacity of the air cleaner reduces the degree of freedom in layout. Furthermore, increasing the diameter of the intake duct passage increases the noise caused by the intake. The straddle-type vehicles described in Patent Documents 1 and 2 are relatively large vehicles, and the air cleaner is located in a relatively high position in front of the seat. However, in a relatively small vehicle with a small engine displacement, locating the air cleaner in this position significantly impacts the vehicle's appearance.

[0005] An object of the present invention is to provide a structure that improves the intake efficiency of an air cleaner while minimizing the impact on the appearance of the vehicle.

[0006] According to the present invention, there is provided a saddle-type vehicle (1) including a front wheel (10) and a rear wheel (16), an engine (18) disposed between the front wheel (10) and the rear wheel (16) such that a cylinder axis (L) is directed toward the front wheel (10) and configured to output a rotational driving force for the rear wheel (16), a head pipe (2) supporting a steering mechanism (4) of the front wheel (10), and an air cleaner (20) supplying purified air to the engine (18), wherein the air cleaner (20) has a cleaner box (21) accommodating a filter element (26), and a first duct (22), a second duct (23L), and a third duct (23R) connected to the cleaner box (21) and configured to introduce outside air into the cleaner box (21), and is disposed below the head pipe (2) and between the head pipe (2) and the engine (18). A saddle-type vehicle is provided.

[0007] According to the present invention, it is possible to provide a structure that improves the intake efficiency of an air cleaner while minimizing the impact on the appearance of a vehicle.

[0008] 10 is a side view of a saddle-ride type vehicle according to an embodiment of the present invention. FIG. 11 is a perspective view of an air cleaner. FIG. 12 is a plan view of the air cleaner. FIG. 13 is a cross-sectional view taken along line A-A in FIG. 3. FIG. 14 is a front view showing the layout of the air cleaner and a pair of left and right side covers in FIG. 2. FIG. 15 is a perspective view showing the layout of the air cleaner and a pair of left and right side covers in FIG. 2. FIG. 16 is a plan view showing the layout of the air cleaner and a pair of left and right side covers in FIG. 2. FIG. 17 is a view looking up at the air cleaner of the saddle-ride type vehicle of FIG. 1 from below. FIG. 18 is a perspective view of the air cleaner of FIG. 2 with the front case removed. FIG. 19 is a cross-sectional view of the saddle-ride type vehicle of FIG. 1 corresponding to the cross-sectional view taken along line B-B in FIG. 5. FIG. 19 is a cross-sectional view taken along line C-C in FIG. 10. FIG. 19 is an explanatory view showing another example of a rib.

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention as claimed, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be arbitrarily combined. Furthermore, the same reference numerals are used for the same or similar components, and redundant explanations will be omitted.

[0010] 1 is a left side view of a saddle-riding vehicle 1 according to one embodiment of the present invention. The saddle-riding vehicle 1 is a motorcycle that has one front wheel 10 and one rear wheel 16 and travels by rotating the rear wheel 16 using the rotational driving force of an engine 18. Hereinafter, the saddle-riding vehicle 1 may also be referred to as the vehicle 1. The forward side of the vehicle 1 in the direction of travel is referred to as the front side, and the opposite side is referred to as the rear side. The left and right of the vehicle 1 refer to the left and right when traveling forward.

[0011] The vehicle 1 includes a head pipe 2 that supports a steering mechanism 4 for a front wheel 10. The steering mechanism 4 includes a steering stem 5 that is swingably supported on the head pipe 2. A steering handlebar 6 is fixed to the upper end of the steering stem 5. A bottom bridge 7 is fixed to the lower end of the steering stem 5. The bottom bridge 7 supports a pair of left and right front forks 8. The front wheel 10 is rotatably supported by the pair of left and right front forks 8. A rider seated on a seat 17 operates the steering handlebar 6 to steer the front wheel 10. The front wheel 10 is covered from above to the rear by a fender 9. The fender 9 is supported by the pair of left and right front forks 8.

[0012] The steering mechanism 4 is surrounded by a front cover (front cowl) 11 that covers the front of the vehicle 1 and a pair of left and right side covers (side cowls) 12L, 12R that cover the sides of the vehicle 1 (only the side cover 12L is shown in Figure 1).

[0013] The vehicle 1 has a pair of left and right main frames 3 extending rearward from a head pipe 2. Only a portion of the main frames 3 is shown in Fig. 1. A swing arm 15 is pivotally supported via a pivot 14 on a pivot frame 13 connected to the rear of the main frames 3. A rear wheel 16 is rotatably supported on the rear end of the swing arm 15.

[0014] The engine 18 and the reduction gear unit 19 are supported by the main frame 3 in an area between the front wheel 10 and the rear wheel 16. In this embodiment, the engine 18 is an air-cooled, single-cylinder, four-stroke SOHC engine. The reduction gear unit 19 includes a transmission and a clutch that connects and disconnects the engine 18 from the transmission. The rotational driving force of the engine 18 is transmitted to the rear wheel 16 via the transmission and a chain (not shown), causing the rear wheel 16 to rotate.

[0015] The engine 18 has, in order from the front of the vehicle 1, a cylinder head 18a, a cylinder block, and a crankcase. A cylinder axis L of the cylinder block is oriented toward the front wheels 10, or in other words, the engine 18 is supported with the cylinder axis L facing the fore-and-aft direction of the vehicle 1. Air purified by an air cleaner 20 is supplied to an intake port 18b of the cylinder head 18a.

[0016] FIG. 2 is a perspective view of the air cleaner 20, FIG. 3 is a plan view of the air cleaner 20, and FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3. The air cleaner 20 includes a cleaner box 21 and ducts 22, 23L, 23R, and 24. The cleaner box 21 is a hollow member having an internal space 21a. The cleaner box 21 includes a front case 27 on the front side and a rear case 28 on the rear side, with a filter element 26 sandwiched between them. The internal space 21a is divided into a dirty side 21b into which unfiltered air is introduced by the filter element 26, and a clean side 21c into which air that has passed through the filter element 26 and been filtered is introduced. The front case 27 forms the front portion of the cleaner box 21, and a recess 27a recessed rearward is formed in its center.

[0017] Ducts 22, 23L, and 23R are intake ducts that introduce outside air into the cleaner box 21. Duct 22 is connected to the upper part of the back of the cleaner box 21 and extends rearward of the cleaner box 21. In this embodiment, duct 22 is formed integrally with the rear case 28. At both ends of duct 22, an opening 22a serving as an inlet in the air flow direction and an opening 22b serving as an outlet are formed. Opening 22a is open to the atmosphere, and opening 22b is open to the dirty side 21b.

[0018] The air cleaner box 20 faces the opening 22a and includes a curved member 25 that is recessed in a direction away from the opening 22a. The curved member 25 is a shell having a hemispherical shape and is formed integrally with the rear case 28. The curved member 25 guides the airflow toward the opening 22a by its inner curved surface.

[0019] The ducts 23L and 23R are connected to the sides of the cleaner box 21 at a position lower than the duct 22. The duct 23L is connected to the left side of the cleaner box 21, and the duct 23R is connected to the right side of the cleaner box 21. In this embodiment, the ducts 23L and 23R are connected to the front case 27 in a separable manner.

[0020] The duct 23L extends to the side (left side) of the cleaner box 21 and then curves rearward. The duct 23R extends to the side (right side) of the cleaner box 21 and then curves rearward. The curved ducts 23L and 23R allow the air cleaner 20 to be made smaller in the vehicle width direction. At both ends of the ducts 23L and 23R, an opening 23a serving as an inlet in the air flow direction and an opening 23b serving as an outlet are formed. Each opening 23a is open to the atmosphere, and each opening 23b opens to the dirty side 21b.

[0021] The duct 24 is an air supply duct that supplies air purified by the filter element 26 to the intake port 18b of the engine 18. The duct 24 is connected to, for example, a throttle valve (not shown) and supplies air to the intake port 18b via the throttle valve. The duct 24 has an overall U-shape, protruding rearward from the clean side 21c in the front-to-rear direction, then curving downward and extending again toward the front. At both ends of the duct 24, an opening 24b serving as an inlet in the air flow direction and an opening 24a serving as an outlet are formed. The opening 24a is connected to the throttle valve (not shown), and the opening 24b opens to the clean side 21c.

[0022] A pipe section 24c that protrudes toward the clean side 21c is formed midway through the duct 24. The pipe section 24c is located downstream of the opening 24b in the air flow direction, is an opening that opens toward the clean side 21c, and forms an inlet separate from the opening 24b. By taking purified air into the duct 24 from the pipe section 24c in addition to the opening 24b, purified air can be efficiently supplied to the engine 18 from the entire clean side 21c, not just from a portion of the space around the opening 24b.

[0023] The inner diameter of the pipe portion 24c is smaller than the inner diameter of the opening portion 24b. By making the inner diameters of the pipe portion 24c and the opening portion 24b different, it is possible to prevent competition between them for intake air and improve intake efficiency.

[0024] The air cleaner 20 configured as described above takes in outside air into the cleaner box 21 through the three ducts 22, 23L, and 23R by using the negative pressure generated by the engine 18, filters the air with the filter element 26, and supplies the purified air from the duct 24 to the engine 18 side. By providing three ducts 22, 23L, and 23R as intake ducts, intake efficiency is improved and intake noise can be reduced compared to when a single duct is made larger.

[0025] The arrangement of the air cleaner 20 will be further described with reference to FIGS. 1 and 5 to 11. FIG. 5 is a front view showing the layout of the air cleaner 20 and the pair of left and right side covers 12L, 12R. FIG. 6 is a perspective view showing the layout of the air cleaner 20 and the pair of left and right side covers 12L, 12R. FIG. 7 is a plan view showing the layout of the air cleaner 20 and the pair of left and right side covers 12L, 12R. FIG. 8 is a view looking up at the air cleaner 20 from below, showing a state in which the steering mechanism 4 has been removed from the head pipe 2. FIG. 9 is a perspective view showing a state in which the front case 27 has been removed from the air cleaner 20. FIG. 10 is a cross-sectional view of the saddle-type vehicle 1 corresponding to the cross-sectional view taken along line B-B in FIG. 5. FIG. 11 is a cross-sectional view taken along line C-C in FIG. 10.

[0026] The air cleaner 20 is disposed so as to be sandwiched between the side covers 12L, 12R. The air cleaner 20 is disposed below the head pipe 2, between the head pipe 2 and the engine 18 (particularly the cylinder head 18a). In this embodiment, the engine 18 is mounted on the saddle-ride type vehicle 1 with the cylinder axis L facing in the fore-and-aft direction, so there is space above the cylinder head 18a. The air cleaner 20 utilizes this space to be disposed in a relatively compact manner. By disposing the air cleaner 20 between the head pipe 2 and the engine 18, the air cleaner 20 is not noticeable externally. Furthermore, the air cleaner 20 is hidden by the side covers 12L, 12R when the vehicle 1 is viewed from the side. This makes it possible to prevent the air cleaner 20 from affecting the external appearance of the vehicle 1.

[0027] The air cleaner 20 has a recess 27a. The recess 27a makes it possible to avoid interference between the fender 9 and the air cleaner 20, while ensuring the necessary volume for the air cleaner 20.

[0028] Opening 22a, which serves as the entrance of duct 22, is directed toward the rear of vehicle 1. This prevents the amount of intake air for engine 18 from becoming unstable due to the wind generated by the vehicle traveling directly flowing into duct 22, and prevents foreign matter from entering duct 22. On the other hand, since curved member 25 is provided opposite opening 22a, the wind generated by the vehicle traveling is guided to opening 22a by curved member 25, thereby preventing the amount of intake air for engine 18 from becoming insufficient.

[0029] Each opening 23a, which serves as the inlet of the ducts 23L, 23R, is directed diagonally rearward of the vehicle 1. This prevents the airflow from traveling from directly flowing into the ducts 23L, 23R, which would cause the intake volume of the engine 18 to become unstable, and prevents foreign matter from entering the ducts 23L, 23R.

[0030] Each opening 23a faces the corresponding side cover 12L, 12R, and the side cover 12L, 12R has a cover portion 12a disposed in front of the opening 23a. The cover portion 12a is a plate-shaped member that protrudes inward in the vehicle width direction from the corresponding side cover 12L, 12R and is formed integrally with the side cover 12L, 12R so as to partially surround the periphery of the end of the corresponding duct 23L, 23R on the opening 23a side. The cover portion 12a prevents foreign matter from entering the duct 23L, 23R and prevents the duct 23L, 23R from being directly affected by wind during driving, which would place a load on the duct 23L, 23R.

[0031] The side cover 12L is also integrally formed with a plurality of ribs 12b arranged around the opening 23a of the duct 23L. Similarly, the side cover 12R is also integrally formed with a plurality of ribs 12b arranged around the opening 23a of the duct 23R. The ribs 12b can reduce the flow velocity of the traveling wind near the opening 23a, thereby stabilizing the intake volume. Some of the plurality of ribs 12b are positioned opposite the opening 22a, which can effectively reduce the flow velocity of the traveling wind near the opening 23a.

[0032] Ducts 23L and 23R are curved rearward from the side of cleaner box 21. From the standpoint of preventing rain and debris from entering the ducts, it is desirable to attach all of the intake ducts to the rear of cleaner box 21, but the main frame 3 is present behind the cleaner box 21, making it difficult to ensure sufficient space. By curving ducts 23L and 23R from the side of cleaner box 21 and extending rearward, it is possible to ensure sufficient intake capacity while preventing the entry of foreign matter.

[0033] The opening 22b, which is the outlet of the duct 22, opens to the dirty side 21b at a position higher than the openings 23b, which are the outlets of the ducts 23L and 23R. By shifting the vertical positions of the openings 22b and 23b, it is possible to introduce air more uniformly into the dirty side 21b.

[0034] The dirty side 21b of the air cleaner 20 and the filter element 26 are both located forward of the main frame 3. The filter element 26 can be replaced from the front side of the air cleaner 20, and the main frame 3 does not interfere with the work. Meanwhile, the rear of the air cleaner 20 is located between the pair of left and right main frames 3. The air cleaner 20 can be supported by the pair of left and right main frames 3.

[0035] <Other Embodiments> As shown in Figure 12, ribs 30L, 30R may be provided separately from the side covers 12L, 12R. The ribs 30L, 30R are detachably fixed to the inner edges of the side covers 12L, 12R above and forward of the opening 22b. Similar to the rib 12b, the ribs 30L, 30R can reduce the flow velocity of the traveling wind near the opening 22a. Because the ribs 30L, 30R are detachable, they can be attached or removed depending on the intake state of the engine 18.

[0036] Summary of the Embodiments The above-described embodiments disclose at least the following saddle-ride type vehicles.

[0037] 1. A saddle-ride type vehicle (1) according to the above embodiment is a saddle-ride type vehicle (1) including: a front wheel (10) and a rear wheel (16); an engine (18) disposed between the front wheel (10) and the rear wheel (16) such that a cylinder axis (L) points toward the front wheel (10), the engine (18) outputting a rotational driving force for the rear wheel (16); a head pipe (2) supporting a steering mechanism (4) of the front wheel (10); and an air cleaner (20) supplying purified air to the engine (18), wherein the air cleaner (20) includes a cleaner box (21) accommodating a filter element (26), and a first duct (22), a second duct (23L), and a third duct (23R) connected to the cleaner box (21) and introducing outside air into the cleaner box (21); The air cleaner is disposed below the head pipe 2, between the head pipe 2 and the engine 18. According to this embodiment, by providing a plurality of ducts for introducing outside air, it is possible to increase the intake capacity and improve the intake efficiency without increasing the size of the cleaner box or the diameter of the intake passage, and also to prevent noise during intake. In addition, the air cleaner can be disposed compactly in a position that does not affect the appearance.

[0038] 2. The saddle-riding type vehicle (1) of the above embodiment includes a pair of left and right main frames (3) extending rearward from the head pipe (2), the filter element (26) divides the internal space (21a) of the cleaner box (21) into a dirty side (21b) and a clean side (21c), and the dirty side (21b) and the filter element (26) are located forward of the pair of left and right main frames (3) in the fore-and-aft direction of the saddle-riding type vehicle (1). According to this embodiment, the filter element can be replaced without being affected by interference from the main frames, improving maintainability.

[0039] 3. In the saddle-ride type vehicle (1) of the above embodiment, the first duct (22) opens onto the dirty side (21c) at a position higher than the second duct (23L) and the third duct (23R). According to this embodiment, by making the opening positions of the ducts relative to the dirty side different, the dirty side can be filled with air uniformly, thereby improving the intake efficiency of the engine.

[0040] 4. In the saddle-ride type vehicle (1) of the above embodiment, the second duct (23L) is provided so as to extend rearward from one of the left and right sides of the cleaner box (21) while curving, and the third duct (23R) is provided so as to extend rearward from the other of the left and right sides of the cleaner box (21). According to this embodiment, by curving the second duct and the third duct, the air cleaner can be arranged compactly.

[0041] 5. In the saddle-riding type vehicle (1) of the above embodiment, the front portion of the cleaner box (21) in the longitudinal direction of the saddle-riding type vehicle (1) has a recess (27a) recessed rearward. According to this embodiment, the air cleaner can be positioned without interfering with the front wheel or the front wheel fender. This also improves the appearance of the saddle-riding type vehicle.

[0042] 6. The saddle-type vehicle (1) of the above embodiment includes a curved member (25) that faces the intake-side opening (22a) of the first duct (22) and is recessed in a direction away from the opening (22a). According to this embodiment, the curved member can guide the airflow generated while the vehicle is traveling to the opening, thereby improving intake efficiency.

[0043] 7. The saddle-riding vehicle (1) of the above embodiment includes a pair of left and right side covers (12L, 12R) covering the sides of the saddle-riding vehicle (1), the air cleaner is disposed between the pair of left and right side covers, the second duct (23L) extends from one of the left and right sides of the cleaner box (21) to one of the pair of left and right side covers (12L), the third duct (23R) extends from the other of the left and right sides of the cleaner box (21) to the other of the pair of left and right side covers (12R), the one of the pair of left and right side covers (12L) has a cover portion (12a) disposed in front of an intake-side opening (23a) of the second duct (23L), and the other of the pair of left and right side covers (12R) has a cover portion (12a) disposed in front of an intake-side opening (23a) of the third duct (23R). According to this embodiment, the cover catches the wind generated by running the vehicle, and prevents foreign matter from entering the duct.

[0044] 8. In the saddle-ride type vehicle (1) of the above embodiment, one of the pair of left and right side covers (12L) includes a rib (12b, 30L) arranged around the opening (23a) of the second duct (23L), and the other of the pair of left and right side covers (12R) includes a rib (12b, 30R) arranged around the opening (23a) of the third duct (23R). According to this embodiment, the flow velocity of the airflow around the opening is reduced by the rib, thereby enabling a stable supply of air to the engine.

[0045] 9. In the saddle-ride type vehicle (1) of the above embodiment, the filter element (26) divides the internal space (21a) of the cleaner box (21) into a dirty side (21b) and a clean side (21c), the air cleaner (20) has a fourth duct (24) connected to the cleaner box (21) and supplying purified air from the cleaner box (21) to the engine (18), one end of the fourth duct (24) is formed with a first opening (24a) forming an outlet for the purified air, the other end of the fourth duct (24) is formed with a second opening (24b) opening to the clean side (21c) and forming an inlet for the purified air, and a middle portion of the fourth duct (24) is formed with a third opening (24c) opening to the clean side (21c) and forming an inlet for the purified air. According to this embodiment, purified air can be efficiently supplied to the engine from the entire clean side, not just from a portion of the space around the second opening.

[0046] Although the embodiments of the invention have been described above, the invention is not limited to the above-described embodiments, and various modifications and changes are possible within the scope of the gist of the invention.

Claims

1. A front wheel (10) and a rear wheel (16), an engine (18) disposed between the front wheel (10) and the rear wheel (16) such that a cylinder axis (L) is oriented toward the front wheel (10), and outputs a rotational driving force for the rear wheel (16); a head pipe (2) supporting a steering mechanism (4) of the front wheel (10); an air cleaner (20) for supplying purified air to the engine (18); A saddle-type vehicle (1) comprising: The air cleaner (20) comprises: A cleaner box (21) containing a filter element (26); a first duct (22), a second duct (23L) and a third duct (23R) connected to the cleaner box (21) for introducing outside air into the cleaner box (21); and The engine is disposed below the head pipe and between the head pipe and the engine. The second duct (23L) is extended rearward from one of the left and right sides of the cleaner box (21), The third duct (23R) extends rearward from the other of the left and right sides of the cleaner box (21). A saddle-type vehicle characterized by the above.

2. A saddle-type vehicle (1) according to claim 1, The vehicle has a pair of left and right main frames (3) extending rearward from the head pipe (2), The filter element (26) divides the internal space (21a) of the cleaner box (21) into a dirty side (21b) and a clean side (21c), the dirty side (21b) and the filter element (26) are located forward of the pair of left and right main frames (3) in the front-rear direction of the saddle riding type vehicle (1); A saddle-type vehicle characterized by the above.

3. A saddle-type vehicle (1) according to claim 2, The first duct (22) opens onto the dirty side (21c) at a position higher than the second duct (23L) and the third duct (23R). A saddle-type vehicle characterized by the above.

4. A saddle-type vehicle (1) according to claim 1, The second duct (23L) is curved and extends rearward from the one side portion, The third duct (23R) is curved and extends rearward from the other side portion. A saddle-type vehicle characterized by the above.

5. A saddle-type vehicle (1) according to claim 1, The cleaner box (21) has a front portion in the front-rear direction of the saddle riding type vehicle (1) having a recess (27a) recessed rearward. A saddle-type vehicle characterized by the above.

6. A saddle-type vehicle (1) according to claim 1, a curved member (25) facing an opening (22a) on the intake side of the first duct (22) and recessed in a direction away from the opening (22a), A saddle-type vehicle characterized by the above.

7. A saddle-type vehicle (1) according to claim 1, A pair of left and right side covers (12L, 12R) for covering the sides of the saddle riding type vehicle (1) are provided, The air cleaner is disposed between the pair of left and right side covers, The second duct (23L) is extended from one of the left and right sides of the cleaner box (21) to one of the pair of left and right side covers (12L), The third duct (23R) is extended from the other of the left and right side portions of the cleaner box (21) to the other of the pair of left and right side covers (12R), the one (12L) of the pair of left and right side covers has a cover portion (12a) arranged in front of an opening (23a) on the intake side of the second duct (23L), The other of the pair of left and right side covers (12R) has a cover portion (12a) arranged in front of an intake side opening (23a) of the third duct (23R). A saddle-type vehicle characterized by the above.

8. A saddle-type vehicle (1) according to claim 7, the one (12L) of the pair of left and right side covers includes a rib (12b, 30L) arranged around the opening (23a) of the second duct (23L); The other of the pair of left and right side covers (12R) includes a rib (12b, 30R) disposed around the opening (23a) of the third duct (23R). A saddle-type vehicle characterized by the above.

9. A saddle-type vehicle (1) according to claim 1, The filter element (26) divides the internal space (21a) of the cleaner box (21) into a dirty side (21b) and a clean side (21c), the air cleaner (20) has a fourth duct (24) connected to the cleaner box (21) and supplying purified air from the cleaner box (21) to the engine (18); The fourth duct (24) has a first opening (24a) at one end thereof, the first opening forming an outlet for the purified air; The other end of the fourth duct (24) is formed with a second opening (24b) that opens to the clean side (21c) and forms an inlet for purified air; A third opening (24c) is formed in the middle of the fourth duct (24) and opens to the clean side (21c) to form an inlet for purified air. A saddle-type vehicle characterized by the above.

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