air cleaner

Abstract

To improve the detection accuracy of an intake temperature sensor provided on an air cleaner.SOLUTION: An air cleaner (50) is disposed inside a vehicle frame. The air cleaner is provided with an air cleaner case (51) formed with an intake chamber (56), an intake air temperature sensor (95) detecting intake air temperature in the intake chamber, an inlet tube (62) taking air into the intake chamber, and an outlet tube (82) sending out the air from the intake chamber. An upstream portion (91) of the outlet tube projects out to the intake chamber, and a through-hole (92) is formed on a peripheral wall of the upstream portion of the outlet tube.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an air cleaner. [Background technology]

[0002] A straddle-type vehicle having an air cleaner disposed behind the engine is known (see, for example, Patent Document 1). The air cleaner described in Patent Document 1 has an inlet tube attached to the rear surface of an air cleaner case and an outlet tube attached to the front surface of the air cleaner case. Air is taken into the air cleaner case through the inlet tube and filtered by a filter disposed inside the air cleaner. Clean air then enters the outlet tube from the air cleaner and is sent out to the throttle body through the outlet tube. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4121392 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the air cleaner described in Patent Document 1 is located in a narrow space inside the body frame below the seat. This limits the location of the intake air temperature sensor relative to the air cleaner. If the intake air temperature sensor is located outside the air flow inside the air cleaner, there is a risk that the intake air temperature sensor will not be able to accurately detect the intake air temperature.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide an air cleaner that can improve the detection accuracy of an intake air temperature sensor. [Means for solving the problem]

[0006] An air cleaner according to one aspect of the present invention is an air cleaner disposed inside a vehicle body frame, and includes an air cleaner case in which an intake chamber is formed, an intake air temperature sensor for detecting an intake air temperature in the intake chamber, an inlet tube for taking air into the intake chamber, and an outlet tube for sending air out from the intake chamber, wherein an upstream portion of the outlet tube protrudes into the intake chamber, and a through hole is formed in a peripheral wall of the upstream portion of the outlet tube. When viewed from above, a detection portion of the intake air temperature sensor is located downstream of the intake port of the outlet tube and between the through hole and the intake port. This solves the above problem. [Effects of the Invention]

[0007] According to an air cleaner of one aspect of the present invention, a main air flow is formed from the inlet tube to the outlet tube, but air also flows out of the through-holes in the outlet tube, creating an air flow at a location outside the main air flow.Even if the intake air temperature sensor is located at a location outside the main air flow, the detection accuracy of the intake air temperature sensor can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a left side view of a saddle-ride type vehicle according to an embodiment of the present invention; [Figure 2] FIG. 2 is a left side view of the engine and its surroundings according to the present embodiment. [Figure 3] FIG. 2 is a top view of the engine and its surroundings according to the present embodiment. [Figure 4] FIG. 2 is a side view of the air cleaner of the present embodiment. [Figure 5] FIG. 2 is a top view of the air cleaner of the present embodiment. [Figure 6] FIG. 6 is a cross-sectional view of the air cleaner of FIG. 5 taken along line AA. [Figure 7] FIG. 6 is a cross-sectional perspective view of the air cleaner of FIG. 5 taken along line BB. [Figure 8] FIG. 6 is a top view of the air cleaner of FIG. 5 with the upper case removed. [Figure 9] 3 is a diagram showing the flow of air in the air cleaner of the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An air cleaner according to one aspect of the present invention is disposed inside a vehicle body frame. An air cleaner case of the air cleaner defines an intake chamber, and the intake temperature of the intake chamber is detected by an intake temperature sensor. Air is taken into the intake chamber through an inlet tube and discharged from the intake chamber through an outlet tube. An upstream portion of the outlet tube protrudes into the intake chamber, and a through-hole is formed in the peripheral wall of the upstream portion of the outlet tube. A main air flow is formed from the inlet tube to the outlet tube, but air also flows out through the through-hole in the outlet tube, creating an air flow at a location outside the main air flow. Even if the intake temperature sensor is disposed at a location outside the main air flow, the detection accuracy of the intake temperature sensor can be improved. [Example]

[0010] This embodiment will be described in detail below with reference to the accompanying drawings. Fig. 1 is a left side view of a saddle-ride type vehicle according to this embodiment. In the following drawings, arrow FR indicates the front of the vehicle, arrow RE indicates the rear of the vehicle, arrow L indicates the left side of the vehicle, and arrow R indicates the right side of the vehicle.

[0011] As shown in Fig. 1, the saddle-type vehicle 1 is configured by mounting an engine 40, an electrical system, and other various components on a diamond-shaped body frame 10 formed from pipes and sheet metal. The body frame 10 has a pair of main frames 12 that branch off to the left and right from a head pipe 11 and extend rearward, and a pair of down frames 13 that branch off to the left and right from the head pipe 11 and extend downward. The pair of main frames 12 support the rear of the engine 40, and the pair of down frames 13 support the front of the engine 40. Supporting the engine 40 on the body frame 10 ensures the rigidity of the entire vehicle.

[0012] The front portion of the main frame 12 forms a tank rail 14 located above the engine 40, and a fuel tank 31 is supported from below by the tank rail 14. The rear portion of the main frame 12 forms a body frame 15 located behind the engine 40, and a swing arm 25 is swingably supported on the lower half of the body frame 15. A seat rail 21 consisting of an upper rail 22 and a lower rail 23 is attached to the upper half of the body frame 15. A rider seat 32 and a pillion seat 33 are supported on the upper portion of the upper rail 22 behind the fuel tank 31.

[0013] A pair of front forks 34 are steerably supported on the head pipe 11 via a steering shaft (not shown). A front wheel 35 is rotatably supported on the lower part of the front forks 34, and an upper part of the front wheel 35 is covered by a front fender (not shown). A swing arm 25 extends rearward from the body frame 15. A rear wheel 36 is rotatably supported on the rear end of the swing arm 25, and an upper part of the rear wheel 36 is covered by a rear fender (not shown). An engine 40 is connected to the rear wheel 36 via a chain drive transmission mechanism, and power from the engine 40 is transmitted to the rear wheel 36 via the transmission mechanism.

[0014] An air cleaner 50 is disposed behind the engine 40. The space available for disposing the air cleaner behind the engine 40 is limited by the frame width of the main frame 12 and the rail width of the seat rails 21, making it difficult to ensure the capacity of the air cleaner 50 in order to ensure the required output of the engine 40. The intake air temperature inside the air cleaner 50 is detected by an intake air temperature sensor, but if the intake air temperature sensor is disposed in a location away from the main air flow in order to satisfy the capacity of the air cleaner 50 and ensure smooth air flow, the detection accuracy will decrease. Therefore, in this embodiment, an air flow is also created in a location away from the main air flow of the air cleaner 50, improving the detection accuracy of the intake air temperature sensor.

[0015] The peripheral configuration of the engine and the air cleaner will be described with reference to Figures 2 to 8. Figure 2 is a left side view of the engine periphery of this embodiment. Figure 3 is a top view of the engine periphery of this embodiment. Figure 4 is a side view of the air cleaner of this embodiment. Figure 5 is a top view of the air cleaner of this embodiment. Figure 6 is a cross-sectional view of the air cleaner of Figure 5 taken along line AA. Figure 7 is a cross-sectional perspective view of the air cleaner of Figure 5 taken along line BB. Figure 8 is a top view of the air cleaner of Figure 5 with the upper case removed.

[0016] As shown in Figures 2 and 3, the engine 40 is a two-cylinder engine and has a crankcase 41 with an upper-lower split structure. A cylinder 42, a cylinder head 43, and a cylinder head cover 44 are attached to the upper part of the crankcase 41. A magneto cover 45 that covers a magneto (not shown) from the side is attached to the left side of the crankcase 41. A sprocket cover 46 that covers a drive sprocket (not shown) from the side is attached behind the magneto cover 45. A clutch cover 47 that covers a clutch (not shown) from the side is attached to the right side of the crankcase 41.

[0017] A throttle body 48 is connected to the rear surface of the cylinder head 43, and an air cleaner 50 is connected upstream (rear side) of the throttle body 48. The air cleaner 50 is disposed rearward of the engine 40 and inside the pair of main frames 12 and the pair of seat rails 21. As described above, the rear portions of the pair of main frames 12 form the pair of body frames 15, and the front end portion of the air cleaner 50 is positioned inside the pair of body frames 15. The upper half of the body frames 15 is inclined obliquely downward toward the rear, and the air cleaner case 51 behind the body frames 15 is also inclined obliquely downward.

[0018] An upper bracket 16 and a lower bracket 17 are formed on the rear edge of the upper half of the body frame 15. An upper rail 22 of a seat rail 21 is connected to the upper bracket 16, and a lower rail 23 of the seat rail 21 is connected to the lower bracket 17. The upper rail 22 extends rearward across the side of the upper half of the air cleaner case 51, and the lower rail 23 extends diagonally rearward across the side of the lower half of the air cleaner case 51. The front sides of the upper rail 22 and the lower rail 23 are connected via a bridge pipe 24, and the rear sides of the upper rail 22 and the lower rail 23 are connected at the rear of the vehicle.

[0019] The front part of the air cleaner case 51 protrudes upward from the upper rail 22, and the protruding part at the front is housed in the space inside the rider's seat 32 (see Figure 1). The rear part of the air cleaner case 51 protrudes downward from the lower rail 23, and the protruding part at the rear forms an extension part 65 that expands the intake chamber 56 (see Figure 6) inside the air cleaner case 51. The extension part 65 of the air cleaner case 51 is positioned above the swing arm 25 (see Figure 1), and the extension part 65 extends rearward so as to avoid the swing range of the swing arm 25. The volume of the air cleaner case 51 is expanded by utilizing the space below the seat rail 21.

[0020] The battery case 38 and the battery 37 are disposed above the extension portion 65 of the air cleaner case 51. The battery case 38 is supported by the pair of seat rails 21 via a bridge 19. The battery case 38 is formed in a box shape with an open top, and the rectangular parallelepiped battery 37 is held inside the battery case 38. In top view, the pair of inlet tubes 62 of the air cleaner 50 are curved, and the battery 37 is positioned between the pair of inlet tubes 62. Space above the extension portion 65 of the air cleaner 50 is used to ensure space for arranging the battery 37.

[0021] 4 to 6, an air cleaner case 51 of the air cleaner 50 has an upper case 52 and a lower case 53 that are split vertically, and a filter cover 54 attached to the rear surface of the upper case 52. The upper case 52 and the lower case 53 extend diagonally downward from the front to the rear, and the filter cover 54 bulges out in a dome shape on the rear side of the upper case 52. An opening 55 formed in the rear surface of the upper case 52 connects the internal spaces of the upper case 52 and the lower case 53 with the internal space of the filter cover 54, forming an intake chamber 56 inside the air cleaner case 51.

[0022] An air filter 57 is disposed in an opening 55 on the rear surface of the upper case 52, and the air filter 57 is covered from the rear by a filter cover 54. The air filter 57 is tilted along the top surface of the upper case 52 so that the top of the air filter 57 is further forward of the vehicle than the bottom. The air filter 57 divides the intake chamber 56 into a dirty side 58 and a clean side 59. In other words, the dirty side 58 is formed by the filter cover 54 upstream of the air filter 57, and the clean side 59 is formed by the upper case 52 and lower case 53 downstream of the air filter 57.

[0023] A pair of inlet tubes 62 are attached to the left and right side walls 61 of the filter cover 54. The pair of inlet tubes 62 extend from the left and right side walls 61 of the filter cover 54 toward the rear of the vehicle, and air is taken in from the rear of the vehicle to the dirty side 58 by the pair of inlet tubes 62. An intake port 63 of the inlet tube 62 faces toward the rear of the vehicle, and an exhaust port 64 of the inlet tube 62 faces inward in the vehicle width direction. The pair of inlet tubes 62 are positioned inside the pair of seat rails 21 (see FIG. 3), and the distance between the pair of inlet tubes 62 approximately matches the lateral width of the extension portion 65.

[0024] A pair of outlet tubes 82 are attached to a front wall 81 of the lower case 53. The pair of outlet tubes 82 extend longitudinally through the front wall 81 of the lower case 53, and air is sent from the clean side 59 to the engine 40 (see FIG. 1) by the pair of outlet tubes 82. An intake port 83 of the outlet tube 82 faces toward the rear of the vehicle, and an exhaust port 84 of the outlet tube 82 faces toward the front of the vehicle. The pair of outlet tubes 82 are positioned inside the pair of main frames 12 (see FIG. 3), and the pair of outlet tubes 82 are connected to a pair of throttle bodies 48 (see FIG. 2).

[0025] The inlet tube 62 and the outlet tube 82 are attached to the upper side of the air cleaner case 51. As described above, the inlet tube 62 is attached to the filter cover 54, and the outlet tube 82 is attached to the front wall 81 of the lower case 53, and the filter cover 54 and the front wall 81 of the lower case 53 face each other in the front-to-rear direction with the air filter 57 interposed between them in a side view. The outlet port 64 of the inlet tube 62 and the intake port 83 of the outlet tube 82 are located at approximately the same height, which makes it easier for air to flow directly from the inlet tube 62 to the outlet tube 82.

[0026] When the engine 40 is running at low speeds or at a steady state, a main flow of air is formed from the discharge port 64 of the inlet tube 62 to the intake port 83 of the outlet tube 82. The upstream portions 91 of the pair of outlet tubes 82 protrude into the intake chamber 56, and through holes 92 are formed in the peripheral walls of the upstream portions 91. In addition to the main flow of air described above, an air flow is also formed inside the air cleaner case 51 from the through holes 92 to the intake port 83 of the outlet tube 82. An intake air temperature sensor 95 is attached to the top wall of the upper case 52 to detect the intake air temperature of the air flowing out from the through holes 92. The detection result of the intake air temperature sensor 95 is used to control the fuel injection amount.

[0027] The top wall of the upper case 52 protrudes above the upper rail 22 (see Figure 2). A portion of the top wall of the upper case 52 is recessed, and the intake air temperature sensor 95 is disposed in the recess of the upper case 52 so that it faces diagonally upward. The base end of the intake air temperature sensor 95 is exposed to the outside of the case, and a detection unit 96 on the tip side of the intake air temperature sensor 95 is recessed inside the case. A mounting bracket 18 (see Figure 2) for the fuel tank 31 is provided on the top surface of the upper rail 22, and the intake air temperature sensor 95 is positioned below the mounting bracket 18. In this way, the intake air temperature sensor 95 is disposed in the upper case 52, utilizing the space below the mounting bracket 18.

[0028] A breather nipple 85 is formed in the front of the upper case 52, and a breather hose (not shown) extending from the engine 40 is connected to the breather nipple 85. A secondary air nipple 87 is formed in the front of the lower case 53, and a secondary air hose (not shown) extending to the exhaust system is connected to the secondary air nipple 87. A drain plug 88 is provided in the bottom of the lower case 53, and water inside the air cleaner case 51 is drained from the drain plug 88.

[0029] 7 and 8, a pair of outlet tubes 82 are attached to the front wall 81 of the lower case 53, spaced apart from each other on the left and right sides. Upstream portions 91 (rear sides) of the pair of outlet tubes 82 extend toward the air filter 57, and downstream portions 93 (front sides) of the pair of outlet tubes 82 are connected to the throttle body 48 (see FIG. 3). The pair of outlet tubes 82 have different lengths, with the left outlet tube 82 being longer than the right outlet tube 82. The difference in length between the pair of outlet tubes 82 adjusts the output characteristics of the engine 40.

[0030] The intake ports 83 of the pair of outlet tubes 82 face the center of the air filter 57. The pair of outlet tubes 82 are formed with umbrella portions 94 that widen toward the intake ports 83, and the umbrella portions 94 enlarge the intake ports 83 of the outlet tubes 82. The pair of outlet tubes 82 are of different lengths and the umbrella portions 94 of the pair of outlet tubes 82 are offset forward and backward, so the pair of umbrella portions 94 do not interfere with each other at the center of the air filter 57. An intake air temperature sensor 95 is disposed between the pair of outlet tubes 82 in a top view, and a through-hole 92 is formed in the peripheral wall of an upstream portion 91 of the pair of outlet tubes 82.

[0031] In this case, of the peripheral wall on the inner side in the vehicle width direction and the peripheral wall on the outer side in the vehicle width direction of the upstream portion 91 of the outlet tube 82, a through hole 92 is formed in the peripheral wall on the inner side in the vehicle width direction, which is on the intake air temperature sensor 95 side. The air flow from the through hole 92 is directed toward the intake air temperature sensor 95. In addition, in a top view, the detection unit 96 of the intake air temperature sensor 95 is located downstream (forward) of the intake port 83 of the outlet tube 82 and upstream (rear) of the through hole 92. In other words, the detection unit 96 of the intake air temperature sensor 95 is located between the intake port 83 of the outlet tube 82 and the through hole 92. The intake air temperature sensor 95 does not obstruct the main flow of air flowing from the inlet tube 62 to the outlet tube 82.

[0032] In addition to the main flow of air flowing from the inlet tube 62 to the outlet tube 82, an air flow is also created inside the air cleaner case 51 that flows from the through-hole 92 of the outlet tube 82 to the intake port 83. A detection unit 96 of the intake air temperature sensor 95 is positioned midway along the flow of intake air from the through-hole 92 to the intake port 83, improving the detection accuracy of the intake air temperature sensor 95. The detection unit 96 of the intake air temperature sensor 95 is closer to the intake port 83 than the through-hole 92. In a top view, the air diffuses more in the vehicle width direction as it moves from the through-hole 92 toward the intake port 83, so the closer the intake air temperature sensor 95 is to the intake port 83, the greater the layout flexibility of the intake air temperature sensor 95.

[0033] Furthermore, an umbrella portion 94 is formed near the intake port 83, and a detection portion 96 of the intake air temperature sensor 95 is brought close to the umbrella portion 94. Some of the air heading toward the intake port 83 from the through-hole 92 is retained by the umbrella portion 94. In particular, the umbrella portions 94 of the pair of outlet tubes 82 are brought close to each other, and air is more likely to retain at the location where the umbrella portions 94 are brought close to each other. The detection portion 96 of the intake air temperature sensor 95 is directed between the umbrella portions 94 of the pair of outlet tubes 82. The intake air temperature of the retained air is detected by the detection portion 96 of the intake air temperature sensor 95, improving the detection accuracy of the intake air temperature sensor 95.

[0034] The through holes 92 of the pair of outlet tubes 82 face each other, making it easier to direct the air flow from the through holes 92 toward the detection portion 96 of the intake air temperature sensor 95. The intake air temperature sensor 95 is attached to the top wall of the upper case 52, and the detection portion 96 of the intake air temperature sensor 95 is located higher than the outlet tube 82. Because the intake air temperature sensor 95 is provided on top of the air cleaner case 51, the intake air temperature sensor 95 is protected from mud, water, and the like that may be kicked up by the wheels. In addition, the large space between the pair of outlet tubes 82 makes it easier for the detection portion 96 of the intake air temperature sensor 95 to detect the air flow from the through holes 92 toward the intake port 83.

[0035] The air flow in the air cleaner will be described with reference to Fig. 9. Fig. 9 is a diagram showing the air flow in the air cleaner of this embodiment.

[0036] 9, in a top view, a mainstream air flow F1 is formed between the discharge ports 64 of the pair of inlet tubes 62 and the intake ports 83 of the pair of outlet tubes 82. The detection unit 96 of the intake air temperature sensor 95 is disposed downstream (forward) of the intake ports 83 of the pair of outlet tubes 82, and the mainstream air flow F1 is not obstructed by the detection unit 96 of the intake air temperature sensor 95. When the mainstream air flow F1 enters the pair of outlet tubes 82, air flows from the through holes 92 of the pair of outlet tubes 82 toward the intake ports 83. In this way, an air flow F2 is also formed in the air cleaner 50 at a location away from the mainstream air flow F1.

[0037] An intake air temperature sensor 95 is disposed between the pair of outlet tubes 82, and a detection portion 96 of the intake air temperature sensor 95 is positioned between the through-hole 92 and the umbrella portion 94 of the pair of outlet tubes 82 in a top view. Part of the air flow F2 is blocked by the umbrella portion 94 of the pair of outlet tubes 82 and stagnates near the umbrella portions 94 of the pair of outlet tubes 82. The detection portion 96 of the intake air temperature sensor 95 faces toward the umbrella portions 94 of the pair of outlet tubes 82, and the intake air temperature of the air stagnates near the pair of umbrella portions 94 is detected by the detection portion 96 of the intake air temperature sensor 95, improving the detection accuracy of the intake air temperature sensor 95.

[0038] As described above, according to this embodiment, a main air flow is formed from the inlet tube 62 to the outlet tube 82, but air also flows out from the through-holes 92 of the outlet tube 82, creating an air flow at a location outside the main air flow. Even if the intake air temperature sensor 95 is located at a location outside the main air flow, the detection accuracy of the intake air temperature sensor 95 can be improved.

[0039] In this embodiment, a two-cylinder engine is used as an example of the engine, but the type of engine is not particularly limited.

[0040] In addition, in this embodiment, the air cleaner has a pair of inlet tubes and a pair of outlet tubes, but the number of inlet tubes and outlet tubes is not limited. For example, the air cleaner may have a single inlet tube and a single outlet tube, or may have three or more inlet tubes and three or more outlet tubes.

[0041] Furthermore, although the air filter is disposed at an angle in this embodiment, the air filter does not have to be disposed at an angle. For example, the air filter may be disposed vertically.

[0042] In addition, in this embodiment, the detection portion of the intake air temperature sensor is located between the through-hole and the intake port in a top view, but the detection portion of the intake air temperature sensor may be located in a location that does not significantly interfere with the main air flow. For example, the detection portion of the intake air temperature sensor may be located upstream of the intake port of the outlet tube as long as it does not significantly interfere with the main air flow. Alternatively, the detection portion of the intake air temperature sensor may be located downstream of the through-hole.

[0043] In addition, in this embodiment, the outlet tube is formed with an umbrella portion, but the shape of the outlet tube is not particularly limited as long as it can send air out of the intake chamber. For example, the outlet tube does not need to have an umbrella portion.

[0044] In addition, in this embodiment, a through hole is formed in the peripheral wall of the outlet tube on the inner side in the vehicle width direction, but when the intake air temperature sensor is located outside the outlet tube in the vehicle width direction, a through hole may also be formed in the peripheral wall of the outlet tube on the inner side in the vehicle width direction.

[0045] Furthermore, in this embodiment, the intake air temperature sensor is attached to the top wall of the air cleaner case, but the intake air temperature sensor may also be attached to the bottom wall of the air cleaner case.

[0046] Furthermore, in this embodiment, the through holes of the pair of outlet tubes face each other, but the through holes of the pair of outlet tubes do not have to face each other.

[0047] Furthermore, in this embodiment, the pair of outlet tubes are formed to have different lengths, but the pair of outlet tubes may also be formed to have the same length.

[0048] Furthermore, the air cleaner is not limited to the straddle-type vehicle shown in the drawings, and may be used in other types of straddle-type vehicles. A straddle-type vehicle is not limited to all vehicles in which a rider sits astride a seat, but also includes small scooter-type vehicles in which a rider does not sit astride a seat.

[0049] As described above, the air cleaner (50) of this embodiment is an air cleaner disposed inside the vehicle body frame (10) and includes an air cleaner case (51) having an intake chamber (56), an intake air temperature sensor (95) for detecting the intake air temperature in the intake chamber, an inlet tube (62) for drawing air into the intake chamber, and an outlet tube (82) for discharging air from the intake chamber. The upstream portion (91) of the outlet tube protrudes into the intake chamber, and a through-hole (92) is formed in the peripheral wall of the upstream portion of the outlet tube. With this configuration, a main air flow is formed from the inlet tube to the outlet tube, but air also flows out of the through-hole in the outlet tube, creating an air flow at a location outside the main air flow. Even if the intake air temperature sensor is disposed at a location outside the main air flow, the detection accuracy of the intake air temperature sensor can be improved.

[0050] In the air cleaner of this embodiment, the detection portion (96) of the intake air temperature sensor is located downstream of the inlet (83) of the outlet tube in a top view. This configuration improves the detection accuracy of the intake air temperature sensor without blocking the main air flow by the intake air temperature sensor.

[0051] In the air cleaner of this embodiment, the detection portion of the intake air temperature sensor is located between the through-hole and the intake port when viewed from above. With this configuration, an air flow is created from the through-hole toward the intake port, and the detection portion of the intake air temperature sensor is positioned midway along this intake air flow, improving detection accuracy.

[0052] In the air cleaner of this embodiment, the detection portion of the intake air temperature sensor is located closer to the intake port than the through-hole. With this configuration, the air diffuses more in the vehicle width direction as it moves from the through-hole toward the intake port in a top view, which increases the layout flexibility of the intake air temperature sensor as it gets closer to the intake port.

[0053] In the air cleaner of this embodiment, the outlet tube is formed with an umbrella portion (94) that widens toward the intake port. With this configuration, the umbrella portion makes it easier for the air that flows out from the through-hole to remain, thereby improving the detection accuracy of the intake air temperature sensor.

[0054] In the air cleaner of this embodiment, a single through-hole is formed in one of the peripheral walls of the upstream portion of the outlet tube, one on the inner side in the vehicle width direction and one on the outer side in the vehicle width direction, that is the peripheral wall on the intake air temperature sensor side. This configuration makes it easier to direct the air flow from the through-hole toward the detection section of the intake air temperature sensor, thereby improving the detection accuracy of the intake air temperature sensor.

[0055] In the air cleaner of this embodiment, the intake air temperature sensor is attached to the upper wall of the air cleaner case, and is located to the side of the outlet tube in a top view, with the detection unit of the intake air temperature sensor located above the outlet tube. With this configuration, the intake air temperature sensor is provided on top of the air cleaner case, protecting the intake air temperature sensor from mud, water, etc. that may be kicked up by the wheels. Utilizing the large space to the side of the outlet tube makes it easier for the detection unit of the intake air temperature sensor to detect the air flow from the through-hole.

[0056] In the air cleaner of this embodiment, the outlet tube is a plurality of outlet tubes, the intake air temperature sensor is located between adjacent outlet tubes in a top view, and the through holes of the adjacent outlet tubes face each other. This configuration makes it easier to direct the airflow from the through holes of the adjacent outlet tubes toward the intake air temperature sensor, thereby improving the detection accuracy of the intake air temperature sensor.

[0057] Although the present embodiment has been described, other embodiments may be those in which the above-described embodiments and modifications are combined in whole or in part.

[0058] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0059] 10: Body frame 50:Air cleaner 51: Air cleaner case 56: Intake chamber 62: Inlet tube 82: Outlet tube 83: Outlet tube intake 91: Upper reaches 92:Through hole 94: Umbrella part 95: Intake air temperature sensor 96:Detection unit

Claims

1. An air cleaner disposed inside a vehicle body frame, an air cleaner case in which an intake chamber is formed; an intake air temperature sensor that detects an intake air temperature in the intake chamber; an inlet tube that takes air into the intake chamber; an outlet tube that sends air out from the intake chamber, An upstream portion of the outlet tube projects into the intake chamber, and a through hole is formed in a peripheral wall of the upstream portion of the outlet tube, An air cleaner according to claim 1, wherein a detection portion of the intake air temperature sensor is located downstream of the intake port of the outlet tube and between the through hole and the intake port when viewed from above.

2. 2. The air cleaner according to claim 1, wherein a detection portion of the intake air temperature sensor is located closer to the intake port than the through-hole.

3. 3. The air cleaner according to claim 1, wherein the outlet tube is formed with an umbrella portion that widens toward the intake port.

4. An air cleaner disposed inside a vehicle body frame, an air cleaner case in which an intake chamber is formed; an intake air temperature sensor that detects an intake air temperature in the intake chamber; an inlet tube that takes air into the intake chamber; an outlet tube that sends air out from the intake chamber, An upstream portion of the outlet tube projects into the intake chamber, and a through hole is formed in a peripheral wall of the upstream portion of the outlet tube, An air cleaner characterized in that a single through hole is formed in the peripheral wall on the intake air temperature sensor side, of the peripheral walls on the inner side in the vehicle width direction and the outer side in the vehicle width direction of the upstream part of the outlet tube.

5. An air cleaner disposed inside a vehicle body frame, an air cleaner case in which an intake chamber is formed; an intake air temperature sensor that detects an intake air temperature in the intake chamber; an inlet tube that takes air into the intake chamber; an outlet tube that sends air out from the intake chamber, An upstream portion of the outlet tube projects into the intake chamber, and a through hole is formed in a peripheral wall of the upstream portion of the outlet tube, The intake air temperature sensor is attached to the upper wall of the air cleaner case, An air cleaner characterized in that the intake air temperature sensor is located to the side of the outlet tube in a top view, and a detection portion of the intake air temperature sensor is located above the outlet tube.

6. An air cleaner disposed inside a vehicle body frame, an air cleaner case in which an intake chamber is formed; an intake air temperature sensor that detects an intake air temperature in the intake chamber; an inlet tube that takes air into the intake chamber; a plurality of outlet tubes for delivering air from the intake chamber; The upstream portions of the outlet tubes protrude into the intake chamber, and through holes are formed in the peripheral walls of the upstream portions of the outlet tubes. An air cleaner, wherein the intake air temperature sensor is located between adjacent outlet tubes in a top view, and the through holes of the adjacent outlet tubes face each other.

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