Saddle-type vehicle

Abstract

To provide a saddle riding vehicle capable of effectively muffling suction noise using a resonator even when the resonator is attached to a curved manifold.SOLUTION: A saddle riding vehicle (1) has a resonator (40), which serves as a resonant chamber, attached to a manifold (28) which introduces intake air (A) from an air cleaner box (27) to a throttle body (31). The manifold (28) is curved to be convex in a predetermined direction (D) so that a direction in which the intake air (A) is sucked through an inlet (IN) is different from a direction in which the intake air (A) is discharged through an outlet (EX). The resonator (40) is attached to a peripheral surface of a peripheral part of a curved part (28a) of the manifold (28) on the side of the predetermined direction (D) apart from a center line (C) of the manifold (28) in a side view relative to the predetermined direction (D).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a straddle-type vehicle, and more particularly to a straddle-type vehicle in which a resonator is attached to a connecting pipe that guides intake air from an air cleaner box to a throttle body. [Background technology]

[0002] In vehicles powered by an internal combustion engine, a configuration has been known in which a resonator is attached to a connecting pipe that leads intake air from an air cleaner box to a throttle body, acting as a resonance chamber that reduces intake noise by utilizing frequency resonance.

[0003] Patent Document 1 discloses a configuration in which a resonator having a small diameter pipe extending perpendicular to the flow direction of the connecting pipe is attached to a straight connecting pipe that connects an air cleaner box and a throttle body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 63-104666 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, if the connecting pipe that leads the intake air from the air cleaner box to the throttle body is significantly curved depending on the relative positions of the internal combustion engine and the air cleaner box, there is room to consider a resonator mounting structure different from the configuration in Patent Document 1.

[0006] An object of the present invention is to solve the above-mentioned problems of the conventional technology and to provide a saddle-type vehicle that can effectively muffle intake noise with a resonator even when the resonator is attached to a curved connecting pipe. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention has a first feature in that, in a saddle-type vehicle (1) in which a resonator (40) serving as a resonance chamber is attached to a connecting pipe (28) that guides intake air (A) from an air cleaner box (27) to a throttle body (31), the connecting pipe (28) is curved in a convex shape in a predetermined direction (D) so that the direction in which the intake air (A) is drawn in from an intake port (IN) differs from the direction in which the intake air (A) is discharged from an exhaust port (EX), and the resonator (40) is attached to the outer peripheral surface of the curved portion (28a) of the connecting pipe (28) that is closer to the predetermined direction (D) than the center line (C) of the connecting pipe (28) in a side view in the predetermined direction (D).

[0008] A second feature is that the resonator (40) is attached to the outer peripheral surface downstream of the apex (28b) of the curved portion (28a) on the predetermined direction side in terms of the intake air (A).

[0009] A third feature is that a communication passage (41) connected to the connecting pipe (28) is formed near the lower end (40a) of the resonator (40).

[0010] A fourth feature is that the communication passage (41) is inclined so that the resonator (40) is located above the communication passage (41) in a side view of the body of the saddle-ride type vehicle (1).

[0011] A fifth feature is that the central axis (41a) of the communication passage (41) is located within the range of the intake passage (31a) of the throttle body (31) when viewed in the axial direction of the central axis (41a).

[0012] A sixth feature is that the connecting pipe (28) is arranged at an angle relative to the fore-and-aft direction of the vehicle body in a plan view of the vehicle body, and the resonator (40) is arranged in a position where it overlaps in the vertical direction with the power unit (P) of the saddle-ride type vehicle (1).

[0013] Furthermore, a seventh feature is that the throttle body (31) is disposed rearward and below the air cleaner box (27), and the connecting pipe (28) extends rearward from the rear end of the air cleaner box (27), then forms the curved portion (28a) that curves downward and forward, and is connected to the rear end of the throttle body (31) while further pointing forward. [Effects of the Invention]

[0014] According to a first feature, in a saddle-ride type vehicle (1) in which a resonator (40) as a resonance chamber is attached to a connecting pipe (28) that guides intake air (A) from an air cleaner box (27) to a throttle body (31), the connecting pipe (28) is curved to form a convex shape in a predetermined direction (D) so that a direction in which the intake air (A) is drawn in from an intake port (IN) and a direction in which the intake air (A) is discharged from an exhaust port (EX) are different, and the resonator (40) is The resonator is attached to the outer peripheral surface of the curved portion (28a) of the connecting pipe (28) that is closer to the specified direction (D) than the center line (C) of the connecting pipe (28) in a side view in the specified direction (D). Compared to a configuration in which the resonator is attached inside the curved portion, the resonator is attached to a portion where the flow velocity of the intake air is faster, which makes it possible to effectively use the capacity of the resonator, effectively muffle intake noise, smooth out output pulsation, etc.

[0015] According to the second feature, the resonator (40) is attached to the outer peripheral surface downstream of the intake air (A) from the apex (28b) of the curved portion (28a) on the specified direction side. Therefore, by attaching the resonator to the portion where the flow velocity of the intake air is the fastest, it becomes possible to more effectively muffle the intake noise.

[0016] According to the third feature, the communication passage (41) connected to the connecting pipe (28) is formed at a position near the lower end (40a) of the resonator (40). Therefore, even if water or the like enters the inside of the resonator, it is possible to quickly drain it.

[0017] According to a fourth feature, the communication passage (41) is inclined so that the resonator (40) is higher than the communication passage (41) when viewed from the side of the body of the saddle-riding vehicle (1). Therefore, even if water or the like enters the inside of the resonator, it is possible to discharge the water more quickly.

[0018] According to the fifth feature, the central axis (41a) of the communication passage (41) is located within the range of the intake passage (31a) of the throttle body (31) when viewed in the axial direction of the central axis (41a), thereby making it possible to improve intake efficiency.

[0019] According to the sixth feature, the connecting pipe (28) is disposed at an angle with respect to the fore-and-aft direction of the vehicle body in a plan view of the vehicle body, and the resonator (40) is disposed at a position where it overlaps in the vertical direction with the power unit (P) of the saddle-riding type vehicle (1). This prevents the fore-and-aft dimension of the saddle-riding type vehicle from becoming large.

[0020] According to the seventh feature, the throttle body (31) is disposed rearward and below the air cleaner box (27), and the connecting pipe (28) extends rearward from the rear end of the air cleaner box (27), forms the curved portion (28a) that curves downward and forward, and is connected to the rear end of the throttle body (31) while pointing further forward. Therefore, the air cleaner box and the throttle body can be disposed close to each other while ensuring the length of the connecting pipe, thereby making it possible to reduce the size of the vehicle body. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a left side view of a motorcycle according to one embodiment of the present invention. [Figure 2] FIG. 2 is a left side view of the motorcycle with some exterior components removed. [Figure 3] FIG. 3 is a partially enlarged view of FIG. 2. [Figure 4] FIG. 2 is a plan view showing a connecting pipe and its surrounding structure. [Figure 5]FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0022] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a left side view of a motorcycle 1 according to one embodiment of the present invention. Fig. 2 is a left side view of the motorcycle 1 with some exterior parts removed. The motorcycle 1 is a straddle-type vehicle that travels by transmitting the driving force of a power unit P, which is an integrated combination of an internal combustion engine and a transmission, to a rear wheel WR via a drive chain 17.

[0023] A pair of left and right front forks 10 that pivotally support a front wheel WF are supported at the front end of the body frame F. A front fender 9 that covers the upper part of the front wheel WF is attached to the front forks 10, which are steered by a steering handlebar 2. The front of the steering handlebar 2 is covered by a handlebar cover 4 in which a headlight 5 and a pair of left and right rearview mirrors 3 are arranged, and the rear of the steering handlebar 2 is covered by a meter cover 25 that supports a meter device (not shown). Disposed below the handlebar cover 4 are a front cowl 7 and a pair of left and right side cowls 8 that support a pair of left and right front flasher lamps 6. A rear cover 24 is connected to the rear of the side cowls 8.

[0024] An exhaust device 11 is attached to the bottom of the power unit P, which includes the internal combustion engine. A pair of left and right step bars 13 are attached to the sides of the power unit P, and a shift pedal 12 is pivotally supported below the step bar 13 on the left side in the vehicle width direction. A side stand 14 is pivotally supported behind the shift pedal 12.

[0025] The front end of a swing arm 16, which rotatably supports the rear wheel WR, is pivotally supported by a pivot 15 provided on the body frame F so that it can swing freely. The rear portion of the swing arm 16 is suspended from the body frame F by a pair of left and right rear cushions 19.

[0026] A storage box 26 is disposed below the retractable seat 23, and the outer sides of the storage box 26 in the vehicle width direction are covered by a pair of left and right rear cowls 22. A tail light device 21 and a pair of left and right rear flasher lamps 20 are disposed at the rear of the rear cowl 22, and a rear fender 18 that covers the area above the rear wheel WR is disposed below the tail light device 21.

[0027] An air cleaner box 27 and a connecting pipe 28 that sends intake air filtered by the air cleaner box 27 to the throttle body 31 are disposed below the rear cover 24. The resonator 40 according to this embodiment is attached to the rear of this connecting pipe 28.

[0028] Figure 3 is an enlarged view of a portion of Figure 2. Figure 4 is a plan view showing the connecting pipe 28 and its surrounding structure. The same reference numerals as those used above indicate the same or equivalent parts. A cylinder 32 is attached to the front of a crankcase 34 of the power unit P, and a cylinder head 29 is attached in front of the cylinder 32. A throttle body 31 is attached to the cylinder head 29 via an intake manifold 30.

[0029] The air cleaner box 27 is disposed adjacent to the lower part of the main frame F2, which is located in the center of the vehicle width direction and extends from the upper front to the lower rear. A recess 27b through which the main frame F2 passes is formed in the upper rear part of the air cleaner box 27. An intake pipe 27a that introduces outside air is attached to the right side near the front of the air cleaner box 27.

[0030] Connecting pipe 28 extends rearward from a position on the rear face of air cleaner box 27 toward the left in the vehicle width direction, and then curves downward and forward to be connected to the rear of throttle body 31. Throttle body 31 is disposed rearward and below air cleaner box 27, and by curving connecting pipe 28, the air cleaner box 27 and throttle body 31 can be disposed close to each other while ensuring the length of connecting pipe 28, making it possible to make the vehicle more compact.

[0031] Intake air A introduced through an intake port IN of the connecting pipe 28 flows downstream while changing direction in the same direction as the center line C of the connecting pipe 28, and is discharged from an outlet port EX. The resonator 40 according to this embodiment is attached to the rear of the connecting pipe 28. An extension pipe 28c for attaching the resonator 40 is formed at the rear of the connecting pipe 28. A communication passage 41 (see FIGS. 5 and 6) formed at a position near the bottom of the resonator 40 is inserted into the extension pipe 28c, and the resonator 40 is fixed to the connecting pipe 28 by fastening a fastening band 61. The connecting pipe 28 and the throttle body 31 are fixed by fastening a fastening band 60. A harness H supported by a harness support portion 28e provided on the connecting pipe 28 is routed on the right side of the connecting pipe 28 in the vehicle width direction.

[0032] With regard to the mounting position of the resonator 40 relative to the connecting pipe 28, more specifically, the connecting pipe 28 is curved in a convex shape in a predetermined direction D so that the direction in which the intake air A is drawn in from the intake port IN is different from the direction in which the intake air A is discharged from the discharge port EX, and the resonator 40 is mounted on the outer peripheral surface of a curved portion 28a where the connecting pipe 28 is curved, on the outer peripheral surface on the side of the predetermined direction D relative to the center line C of the connecting pipe 28 in a side view relative to the predetermined direction D. As a result, compared to a configuration in which the resonator is mounted inside the curved portion 28a (in this embodiment, on the front side in a side view of the vehicle body), the resonator 40 is mounted in a portion where the flow velocity of the intake air A is faster, which makes it possible to effectively utilize the capacity of the resonator 40 and effectively muffle intake noise.

[0033] More specifically, the resonator 40 is attached to the outer peripheral surface of the curved portion 28a, downstream of the apex 28b of the curved portion 28a on the side of the predetermined direction D, with respect to the intake air A. In this way, the resonator 40 is attached to the part where the flow velocity of the intake air A is the fastest, which makes it possible to more effectively muffle the intake noise.

[0034] 4, connecting pipe 28 is disposed at an angle relative to the front-to-rear direction of the vehicle body in a plan view of the vehicle body, and resonator 40 is disposed in a position where it overlaps with power unit P in the vertical direction. This prevents the front-to-rear dimension of motorcycle 1 from becoming large. In this embodiment, connecting pipe 28 is inclined so that the front side is positioned to the right of the rear side in the vehicle width direction.

[0035] Figure 5 is a cross-sectional view taken along line VV in Figure 4. Figure 6 is a cross-sectional view taken along line VI-VI in Figure 3, and Figure 7 is a cross-sectional view taken along line VII-VII in Figure 5. The same reference numerals as those used above indicate the same or equivalent parts. The intake passage 30a of the intake manifold 30, which connects the connecting pipe 28 to the intake port 38 of the cylinder head 29, is curved downward by approximately 90 degrees, changing the flow direction of the intake air A, which flows from the rear to the front. The intake manifold 30 is attached to the cylinder head 29 with two fastening members 37.

[0036] A pulley 35, which is rotated by a wire extending from a throttle grip (not shown), is connected to a rotation shaft 39 of the throttle valve 33. The flow path of the intake passage 31a of the throttle body 31 that houses the throttle valve 33 is formed in a straight line.

[0037] A communication passage 41 connected to the connecting pipe 28 is formed near the lower end 40a of the resonator 40. This allows water or other contaminants to be quickly expelled even if they get inside the resonator 40. In addition, the central axis 41a of the communication passage 41 is inclined upward toward the rear so that the resonator 40 is higher than the communication passage 41 in a side view of the vehicle body, further enhancing the ability to expel water.

[0038] 7, in this embodiment, the central axis 41a of the communication passage 41 is configured to be located within the range of the intake passage 31a of the throttle body 31 when viewed in the axial direction of the central axis 41a. This makes it possible to further improve the intake efficiency of the intake air A.

[0039] As described above, according to the resonator mounting structure of the present invention, the connecting pipe 28 is curved in a convex shape in the predetermined direction D so that the direction in which the intake air A is drawn in from the intake port IN is different from the direction in which the intake air A is discharged from the discharge port EX, and the resonator 40 is attached to the outer peripheral surface of the curved portion 28a along which the connecting pipe 28 is curved, on the outer peripheral surface closer to the predetermined direction D than the center line C of the connecting pipe 28 in a side view in the predetermined direction D. Therefore, compared to a configuration in which the resonator is mounted inside the curved portion 28a, the resonator 40 is mounted in a portion where the flow velocity of the intake air A is faster, and the capacity of the resonator 40 can be effectively utilized to effectively muffle intake noise and smooth out output pulsations, etc.

[0040] The configuration of the motorcycle, the configuration of the internal combustion engine of the power unit, the shape and structure of the air cleaner box and throttle body, the shape and structure of the connecting pipe, the shape and structure of the resonator, the length and curvature direction of the connecting pipe, the inclination angle of the communication passage, etc. are not limited to the above-described embodiments and can be variously modified. The resonator mounting structure according to the present invention is not limited to motorcycles, but can be applied to various vehicles such as three-wheeled vehicles and four-wheeled vehicles that use a power unit including an internal combustion engine as a drive source. [Explanation of symbols]

[0041] 1...motorcycle (saddle-ride type vehicle), 27...air cleaner box, 28...connecting pipe, 28a...curved portion, 28b...top of curved portion closer to a predetermined direction, IN...intake port, EX...discharge port, 31...throttle body, 40...resonator, 40a...lower end of resonator, 41...communicating passage, 41a...center axis of communicating passage, 31a...intake passage of throttle body, A...intake air, C...center line of connecting pipe, D...predetermined direction, P...power unit

Claims

1. In a saddle-type vehicle (1), a resonator (40) as a resonance chamber is attached to a connecting pipe (28) that guides intake air (A) from an air cleaner box (27) to a throttle body (31), the connecting pipe (28) is curved convexly in a predetermined direction (D) so that a direction in which the intake air (A) is drawn in from an intake port (IN) is different from a direction in which the intake air (A) is discharged from an exhaust port (EX), the resonator (40) is attached to an outer peripheral surface of the curved portion (28a) of the connecting pipe (28) that is closer to the predetermined direction (D) than a center line (C) of the connecting pipe (28) in a side view with respect to the predetermined direction (D), A communication passage (41) connected to the connecting pipe (28) is formed at a position near the lower end (40a) of the resonator (40), A straddle-type vehicle characterized in that a central axis (41a) of the communication passage (41) is located within the range of an intake passage (31a) of the throttle body (31) when viewed in the axial direction of the central axis (41a).

2. 2. The saddle-type vehicle according to claim 1, wherein the resonator (40) is attached downstream of the intake air (A) from a top portion (28b) of the outer peripheral surface on the predetermined direction side of the curved portion (28a).

3. 3. The saddle-type vehicle according to claim 1, wherein the communication passage (41) is inclined so that the resonator (40) is located above the communication passage (41) when viewed from the side of the vehicle body of the saddle-type vehicle (1).

4. The connecting pipe (28) is disposed at an angle with respect to the front-rear direction of the vehicle body in a plan view of the vehicle body, 3. The straddle-type vehicle according to claim 1, wherein the resonator (40) is disposed at a position overlapping in the vertical direction with a power unit (P) of the straddle-type vehicle (1).

5. The throttle body (31) is disposed rearward and below the air cleaner box (27), 3. The straddle-type vehicle according to claim 1, wherein the connecting pipe (28) extends rearward from the rear end of the air cleaner box (27), then forms the curved portion (28a) that curves downward and forward, and is connected to the rear end of the throttle body (31) while pointing further forward.

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