Straddle type vehicle

Abstract

To prevent performance deterioration of an electric component even when the electric component is installed in a swing arm.SOLUTION: A straddle type vehicle includes a swing arm (40) supported by a vehicle body frame so as to be swingable. The swing arm is provided with: pivot portions (43, 44) connected to a vehicle body frame at an arm front-end part; a rear-wheel support portion (52) rotatably supporting a rear wheel (26) at an arm rear-end part; and a case portion (49) storing an electric component (31) in front of the arm rear-end part. An opening (55) through which the electric component is exposed to outside is formed in the case portion.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] In recent years, electric straddle-type vehicles that run on electricity have been developed. One known example of this type of straddle-type vehicle is one in which a motor is installed at the rear end of a swing arm (see, for example, Patent Document 1). The straddle-type vehicle described in Patent Document 1 is a scooter-type vehicle with a low floorboard installed in front of the seat, a lower frame passes under the floorboard, and side frames rise rearward from the rear end of the lower frame toward the seat. A swing arm is supported at the rear end of the lower frame so that it can swing, and a direct drive motor is installed at the rear end of the swing arm coaxially with the rear wheel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-67278 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the saddle-type vehicle described in Patent Document 1, the driver can easily touch the motor, so it is necessary to cover the entire motor with a cover. As a result, the heat of the motor is trapped inside the cover, and the motor temperature rises, making it difficult to ensure sufficient output. In addition, a similar problem can occur when electrical components other than the motor are installed on the swing arm.

[0005] The present invention has been made in consideration of the above-mentioned points, and has an object to provide a saddle-type vehicle that can suppress deterioration in the performance of electrical components even when the electrical components are mounted on the swing arm. [Means for solving the problem]

[0006] One embodiment of the present invention provides a saddle-type vehicle equipped with a swing arm that is swingably supported on a body frame, the swing arm having a pivot portion that connects to the body frame at a front end of the arm, a rear wheel support portion that rotatably supports the rear wheel at a rear end of the arm, and a case portion that houses electrical components forward of the rear end of the arm, and the case portion is formed with an opening that exposes the electrical components to the outside, thereby solving the above-mentioned problems. Effect of the Invention

[0007] According to the saddle-type vehicle of one aspect of the present invention, the electric components are positioned in the center of the vehicle body forward of the rear wheels, so that the driver has difficulty in touching the motor, and there is no need to entirely cover the electric components with a case. By forming an opening in the case, heat from the electric components can be easily released from the opening in the case, and deterioration of the performance of the electric components due to a rise in temperature of the electric components can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the saddle-ride type vehicle of the present embodiment. [Diagram 2] FIG. 2 is a right side view of the rear part of the vehicle body of the present embodiment. [Diagram 3] 3 is a cross-sectional view of the rear part of the vehicle in FIG. 2 taken along line AA. [Figure 4] FIG. 2 is a bottom view of the rear part of the vehicle according to the present embodiment. [Diagram 5] 3 is a cross-sectional view of the rear part of the vehicle in FIG. 2 taken along line BB. [Figure 6] 3 is a cross-sectional view of the rear part of the vehicle in FIG. 2 taken along line CC. [Figure 7] 3 is a cross-sectional view of the rear part of the vehicle in FIG. 2 taken along line DD. [Figure 8] 7 is a cross-sectional view of the rear part of the vehicle in FIG. 6 taken along line EE. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A saddle-type vehicle according to one aspect of the present invention includes a swing arm that is swingably supported by a vehicle body frame. A pivot portion at a front end of the swing arm is connected to the vehicle body frame, and a rear wheel is rotatably supported by a rear wheel support portion at a rear end of the arm. Electrical components are housed in the arm portion forward of the rear end of the arm, and an opening is formed in the case portion to expose the electrical components to the outside. Positioning the electrical components in the center of the vehicle body forward of the rear wheel makes it difficult for the driver to touch the motor, and there is no need to entirely cover the electrical components with the case portion. Forming an opening in the case portion makes it easier for heat from the electrical components to be released from the opening in the case portion, and it is possible to suppress a decrease in performance of the electrical components due to a rise in temperature of the electrical components. EXAMPLES

[0010] The saddle riding vehicle of this embodiment will be described below with reference to the accompanying drawings. Fig. 1 is a left side view of the saddle riding vehicle of this embodiment. In the following drawings, the arrow Fr indicates the front of the vehicle, the arrow Re indicates the rear of the vehicle, the arrow L indicates the left side of the vehicle, and the arrow R indicates the right side of the vehicle.

[0011] As shown in Fig. 1, a saddle-type vehicle 1 is configured by mounting various covers as the exterior of the vehicle body to an underbone-type body frame 10. A head pipe 11 is provided at the front end of the body frame 10, and a front frame 12 extends diagonally downward and rearward from the head pipe 11. A pair of left and right side frames 13 are connected to the lower part of the front frame 12, and the pair of side frames 13 extend rearward and then rise diagonally upward and rearward. A fixed battery 21 and a storage box 22 are mounted inside the pair of side frames 13, and a seat (not shown) is mounted above the battery 21 and the storage box 22.

[0012] A front fork 23 is steerably supported on the head pipe 11 via a steering shaft (not shown). A handlebar 24 is provided on the upper part of the steering shaft, and a front wheel 25 is rotatably supported on the lower part of the front fork 23. A swing arm 40 is supported on the pivot bracket 14 of the pair of side frames 13, and a rear wheel 26 is rotatably supported on the rear part of the swing arm 40. The rear ends of the pair of side frames 13 and the rear part of the swing arm 40 are connected via a rear suspension 27, and the rear suspension 27 expands and contracts as the swing arm 40 swings to absorb unevenness in the road surface.

[0013] In a typical electric straddle-type vehicle, the motor is installed at the rear of the vehicle, such as on the rear end of the arm or on the inside of the rear wheel, to ensure installation space for the battery, storage box, and floorboard. Because the motor is easily touched by the driver at the rear of the vehicle, it is necessary to cover the entire motor to ensure safety. This can lead to heat buildup inside the cover, reducing the motor's output. Because the motor, which is a heavy object, is located away from the center of gravity in the center of the vehicle body, the moment of inertia during turning can increase, which can lead to reduced maneuverability. Because vibrations caused by unevenness in the road surface are transmitted to the motor near the rear wheels, strict vibration resistance is required for the motor and fastenings.

[0014] Furthermore, the unsprung load becomes heavy, and the rear wheels are unable to follow the unevenness of the road surface, and the vibration of the rear wheels is transmitted to the driver on the seat, resulting in a poor ride. Furthermore, sufficient rigidity is required to place a heavy object on the rear of the swing arm, and the weight increases in order to increase the rigidity of the swing arm. Therefore, in order to solve the above problems, the electric straddle-type vehicle 1 of this embodiment is equipped with a swing arm 40 on the front end side of the arm, and an opening is formed in the swing arm 40 to expose the motor 31 to the outside and improve heat dissipation.

[0015] The rear structure of a saddle-type vehicle will be described below with reference to Figs. 2 to 7. Fig. 2 is a right side view of the rear of the vehicle body of this embodiment. Fig. 3 is a cross-sectional view of the rear of the vehicle in Fig. 2 cut along line AA. Fig. 4 is a bottom view of the rear of the vehicle in this embodiment. Fig. 5 is a cross-sectional view of the rear of the vehicle in Fig. 2 cut along line BB. Fig. 6 is a cross-sectional view of the rear of the vehicle in Fig. 2 cut along line CC. Fig. 7 is a cross-sectional view of the rear of the vehicle in Fig. 2 cut along line DD. Note that the continuously variable transmission is omitted in Fig. 7.

[0016] As shown in Fig. 2, at the rear of the body of the saddle riding type vehicle 1, a pair of side frames 13 extend obliquely upward from the front to the rear. A battery 21 and a storage box 22 are arranged side by side in front and rear inside the pair of side frames 13. A battery case of the battery 21 is formed in a generally rectangular shape in a side view, and a plurality of cells (single cells) are stored inside the battery case. The battery 21 is tilted forward so that a front lower corner of the battery 21 is the lowest and a rear upper corner of the battery 21 is the highest in a side view, and the front upper corner of the battery 21 is the most forward and the rear lower corner of the battery 21 is the most rearward.

[0017] A fixed bracket 15 protrudes upward from near the rise of the pair of side frames 13, and a fixed bracket 16 protrudes downward from the middle position between the pair of side frames 13. A front lower corner of a battery 21 is fixed to the front fixed bracket 15, and a rear lower corner of the battery 21 is fixed to the rear fixed bracket 16. A pivot bracket 14 protrudes downward from near the rise of the pair of side frames 13, and a swing arm 40 is supported by the pivot bracket 14 via a pivot shaft 17 so that the swing arm 40 can swing. The swing arm 40 and its rear end are connected to the side frame 13 via a rear suspension 27.

[0018] 2 and 3, the swing arm 40 has a left-right split structure made up of a pair of arm halves 41, 42, with the left arm half 41 extending further rearward than the right arm half 42. Pivot portions 43, 44 are provided at the front ends of the pair of arm halves 41, 42, and the pivot portions 43, 44 are connected to the vehicle body frame 10 (pivot bracket 14). Front arms 45, 46 extend rearward from each pivot portion 43, 44, and a plurality of pillar portions 47, 48 extend inward in the vehicle width direction from the four corners of both sides on the rear side of the front arms 45, 46. The plurality of pillar portions 47, 48 are screwed together to form a case portion 49, and the case portion 49 houses the motor 31.

[0019] A rear arm 51 extends rearward from the left half of the case part 49, and no arm extends rearward from the right half of the case part 49. A rear wheel support part 52 is provided at the rear end part of the rear arm 51, i.e., the rear end part of the arm of the left arm half 41, and the rear wheel 26 is rotatably supported by the rear wheel support part 52. A swing arm cover 53 is attached to the open left side surface of the left arm half 41. A belt-type continuously variable transmission (not shown) is housed inside the left arm half 41 and the swing arm cover 53, and the left arm half 41 and the swing arm cover 53 form a belt cover for the continuously variable transmission.

[0020] The case part 49 is formed forward of the rear end of the arm, so that the motor 31 is positioned in the center of the vehicle body in the front-rear direction. Since the center of the vehicle body is covered by a vehicle body cover or the like, the motor 31 is difficult for the driver to touch even if it is exposed to the outside. For this reason, the case part 49 is formed so as to surround the motor 31 by the columnar parts 47, 48, and openings 55-58 (see Figs. 4 to 6 for openings 56-58) are formed on the upper, lower, front and rear surfaces of the case part 49. The motor 31 is exposed to the outside from the openings 55-58 of the swing arm 40 in the center of the vehicle body, so that the temperature rise of the motor 31 is suppressed.

[0021] In a side view, the front half of the swing arm 40 from the pivot portions 43, 44 to the case portion 49 is positioned directly below the battery 21. As described above, the battery 21 is supported by the side frame 13 in a forward-leaning position, and the front lower corner of the battery 21 is positioned lower than the case portion 49. At this time, the lower surface of the battery 21 is positioned outside the swing space of the swing arm 40 centered on the pivot shaft 17. When the swing arm 40 swings, the lower surface of the battery 21 is brought closer to the swing arm 40 with interference between the swing arm 40 and the battery 21 suppressed, thereby lowering the center of gravity of the vehicle.

[0022] In this way, even if the battery 21 is brought closer to the swing arm 40, the motor 31 can be positioned directly below the battery 21. By bringing the motor 31, which is a heavy object, closer to the center of gravity of the vehicle, the moment of inertia during turning is reduced, and deterioration of driving performance is suppressed. The motor 31 is located closer to the pivot parts 43, 44 than the rear wheel support part 52. Because the motor 31 is located in front of the rear wheel 26, vibrations from the rear wheel 26 caused by unevenness in the road surface are less likely to be transmitted to the motor 31. The fastening of the motor 31 to the case part 49 and the vibration resistance performance of the motor 31 are relaxed, simplifying the structure of the swing arm 40.

[0023] The rear suspension 27 is connected to the rear end of the swing arm 40, and the unsprung load is reduced by bringing the motor 31 closer to the pivot shaft 17. The rear suspension 27 moves more easily, and the rear wheel 26 follows the unevenness of the road surface, improving the ride comfort. In addition, since a large bending moment acts near the pivot part in a typical swing arm, it is desirable to form the front end side of the arm with a large width and the rear end side of the arm with a small width. In this embodiment, the rigidity of the swing arm 40 is increased by forming the swing arm 40 with a large width by the case part 49 on the front end side of the arm.

[0024] As shown in Fig. 3, a substantially rectangular opening 55 is formed between the columnar parts 47, 48 on the upper surface of the case part 49 of the swing arm 40. The upper surface of the motor 31 is exposed to the outside from the opening 55 on the upper surface of the case part 49, and hot air that has been warmed by the motor 31 and become lighter is released to the outside from the opening 55. Hot air is less likely to be trapped inside the case part 49, and a rise in temperature of the motor 31 is suppressed. The battery 21 (see Fig. 2) is positioned above the case part 49, and the opening 55 on the upper surface of the case part 49 is covered from above by the battery 21. Even though a large opening 55 is formed on the upper surface of the case part 49, it is difficult for the driver to touch the motor 31, ensuring safety.

[0025] In this embodiment, the position of the left end of the opening 55 on the top surface of the case part 49 is located more inward in the left-right direction of the vehicle body than the position of the left end of the battery 21. Similarly, the position of the right end of the opening 55 on the top surface of the case part 49 is located more inward in the left-right direction of the vehicle body than the position of the right end of the battery 21 (see FIG. 7). Also, the position of the front end of the opening 55 on the top surface of the case part 49 is located rearward of the position of the front end of the lower surface of the battery 21. Similarly, the position of the rear end of the opening 55 on the top surface of the case part 49 is located more inward in the left-right direction of the vehicle body than the position of the rear end of the lower surface of the battery 21 (see FIG. 8).

[0026] As shown in FIG. 4, a substantially rectangular opening 56 is formed between the columnar parts 47, 48 on the underside of the case part 49 of the swing arm 40. The underside of the motor 31 is exposed to the outside from the opening 56 on the underside of the case part 49, and hot air warmed by the motor 31 is released from the opening 56 on the wind while traveling. Hot air is less likely to be trapped inside the case part 49, and an increase in temperature of the motor 31 is suppressed. The road surface is present below the case part 49, and the opening 56 on the underside of the case part 49 is difficult for the driver to see. Even if a large opening 56 is formed on the underside of the case part 49, it is difficult for the driver to touch the motor 31, and safety is ensured.

[0027] As shown in Fig. 5, a substantially rectangular opening 57 is formed between the columnar parts 47, 48 on the front side of the case part 49 of the swing arm 40. The front side of the motor 31 is exposed to the outside from the opening 57 on the front side of the case part 49, and the motor 31 is cooled by the running wind taken in from the opening 57 on the front side of the case part 49, thereby suppressing the temperature rise. An electronic device 33 such as an inverter is positioned in front of the case part 49, and the opening 57 on the front side of the case part 49 is covered from the front by the electronic device 33 (see Figs. 5 and 8). Even if a large opening 57 is formed on the front side of the case part 49, it is difficult for the driver to touch the motor 31, so safety is ensured.

[0028] A pair of front arms 45, 46 extend from the case part 49 toward the pivot parts 43, 44. The distance between the front arms 45, 46 increases toward the front, and the front space of the case part 49 expands in the left-right direction toward the front. A larger amount of running wind is taken into the case part 49 through an opening 57 on the front side of the case part 49, and the motor 31 is effectively cooled. In addition, the cables 34 extending from the battery 21 and the electronic device 33 are connected to the motor 31 through the opening 57 on the front side of the case part 49. The opening 57 on the front side of the case part 49 also functions as a passage for the cables 34 of the battery 21 and the electronic device 33.

[0029] As shown in FIG. 6, a substantially rectangular opening 58 is formed between the columnar parts 47, 48 on the rear surface of the case part 49 of the swing arm 40. The rear surface of the motor 31 is exposed to the outside from the opening 58 on the rear surface of the case part 49, and hot air heated by the motor 31 is released from the opening 58 into a large rear space on the rear wheel 26 side. Hot air is less likely to be trapped inside the case part 49, and an increase in temperature of the motor 31 is suppressed. The rear wheel 26 (see FIG. 2) is positioned behind the case part 49, and the opening 58 on the rear surface of the case part 49 is covered from behind by the rear wheel 26. Even though a large opening 58 is formed on the rear surface of the case part 49, it is difficult for the rider to touch the motor 31, ensuring safety.

[0030] As shown in Fig. 7, the inside of the case portion 49 of the swing arm 40 is divided into left and right by a partition wall 61 of the left arm half 41. The motor 31 is accommodated in the space to the right of the partition wall 61 of the case portion 49, and the continuously variable transmission is accommodated in the space to the left of the partition wall 61 of the case portion 49. The motor 31 is screwed to the right side surface of the partition wall 61 with a plurality of bolts (not shown). A circular opening 62 is formed in the center of the partition wall 61, and the output shaft 32 of the motor 31 protrudes through the circular opening 62 into the space to the left of the partition wall 61. A drive pulley (not shown) of the continuously variable transmission is connected to the output shaft 32 of the motor 31.

[0031] The motor 31 is fixed to the partition wall 61 with the periphery of the output shaft 32 of the motor 31 in surface contact with the partition wall 61 of the case part 49. In this case, the left side surface around the output shaft 32 of the motor 31 serves as a heat dissipation surface, and the right side surface of the partition wall 61 in contact with the motor 31 serves as a heat absorption surface. Heat is efficiently transferred from a wide area of ​​the left side surface of the motor 31, excluding the output shaft 32, to the partition wall 61 of the case part 49. The heat of the motor 31 is transferred to the case part 49, and the swing arm 40 functions as a heat sink, thereby suppressing a temperature rise of the motor 31. For this reason, a material with high heat dissipation properties, such as an aluminum alloy, is used for the swing arm 40.

[0032] The cooling structure of the motor will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view of the rear part of the vehicle in Fig. 6 taken along line EE.

[0033] As shown in Fig. 8, the case portion 49 of the swing arm 40 is formed by fixing a columnar portion 47 of the left arm half 41 (see Fig. 3) and a columnar portion 48 of the right arm half 42. The columnar portions 47, 48 of the case portion 49 are located obliquely above the front, below the front, above the rear, and below the rear of the circular motor 31 so as to surround the motor 31 from all sides. A plurality of fixing bolts 59 pass through each of the columnar portions 47, 48, and the left arm half 41 and the right arm half 42 are fixed by the plurality of fixing bolts 59 to form the case portion 49. Openings 55-58 are formed on the upper, lower, front, and rear surfaces of the case portion 49.

[0034] An opening 57 on the front surface of the case part 49 faces forward, and an opening 56 on the bottom surface of the case part 49 faces diagonally downward toward the front. The wind is taken into the case part 49 from the opening 57 on the front surface of the case part 49, flows from the front surface of the motor 31 along the upper surface, and escapes to the outside of the case part 49 from an opening 55 on the top surface of the case part 49. The wind is also taken into the case part 49 from an opening 56 on the bottom surface of the case part 49, flows from the bottom surface of the motor 31 along the rear surface, and escapes to the outside of the case part 49 from an opening 58 on the rear surface of the case part 49. The wind is blown onto the motor 31 inside the case part 49 to cool it.

[0035] At the top of the motor 31, hot air is emitted upward from an opening 55 on the top surface of the case part 49, and is also swept rearward by the wind caused by traveling that passes through the opening 55 on the top surface of the case part 49. At the bottom of the motor 31, hot air is emitted downward from an opening 56 on the bottom surface of the case part 49, and is swept rearward by the wind caused by traveling that is below the case part 49. The hot air is also swept rearward by the wind caused by traveling that enters from the opening 56 on the bottom surface of the case part 49. At the rear of the motor 31, hot air is emitted rearward from an opening 58 on the rear surface of the case part 49, and is also swept rearward by the wind caused by traveling that passes through the opening 58 on the rear surface of the case part 49.

[0036] Also, since the left side surface of the motor 31 is in surface contact with the left arm half 41 (see FIG. 7), heat from the motor 31 is transferred to the left arm half 41. In this way, the wind from traveling is blown onto the upper, lower, front, and rear surfaces of the motor 31, and the hot air warmed by the motor 31 is released from the openings 55-58 of the case portion 49, thereby cooling the peripheral surface of the motor 31. The left side surface of the motor 31 is cooled by heat being transferred from the left side surface of the motor 31 to the left arm half 41. Although the right side surface of the motor 31 is separated from the right arm half 42, the wind from traveling also flows into the gap between the right side surface of the motor 31 and the right arm half 42, thereby cooling the right side surface of the motor 31.

[0037] As described above, according to the saddle-type vehicle 1 of this embodiment, the motor 31 is positioned in the center of the vehicle body forward of the rear wheel 26, so that the driver has difficulty in touching the motor 31, and there is no need to entirely cover the motor 31 with the case portion 49. By forming the openings 55-58 in the case portion 49, heat from the motor 31 is easily released from the openings 55-58 of the case portion 49, and a decrease in output of the motor 31 due to an increase in temperature is suppressed. Vibrations from the rear wheel 26 are less likely to be transmitted to the motor 31, so that the vibration resistance performance of the motor 31 and fastening is alleviated, and the case portion 49 widens the base end side, thereby increasing the rigidity of the swing arm 40.

[0038] In this embodiment, a motor has been described as an example of an electrical component, but the electrical component may also be a battery, a fuel cell, a converter, etc., and the battery, fuel cell, converter, etc. may be housed within the case portion of the swing arm.

[0039] In the present embodiment, the swing arm is formed in a left-right split structure consisting of a pair of arm halves, but the swing arm may be formed so as to be capable of accommodating electrical components. For example, the swing arm may be formed in an up-down split structure consisting of a pair of arm halves.

[0040] In addition, in this embodiment, openings are formed on the top, bottom, front and rear surfaces of the case portion, but it is sufficient that an opening is formed on at least one of the top, bottom, front and rear surfaces of the case portion.

[0041] In addition, in this embodiment, the pivot portion is formed separately on the left and right sides, but the shape of the pivot portion is not particularly limited as long as the pivot portion is formed so as to be connectable to the vehicle body seat.

[0042] The swing arm of the present embodiment is not limited to the above-mentioned saddle-ride type vehicle, and may be adopted in other saddle-ride type vehicles. Note that the saddle-ride type vehicle is not limited to all vehicles in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0043] As described above, the first aspect is a saddle-type vehicle (1) equipped with a swing arm (40) supported to be swingable on a body frame (10), the swing arm having a pivot portion (43, 44) that connects the front end of the arm to the body frame, a rear wheel support portion (52) that rotatably supports the rear wheel (26) at the rear end of the arm, and a case portion (49) that houses an electric component (motor 31) forward of the rear end of the arm, and the case portion has an opening (55-58) that exposes the electric component to the outside. According to this configuration, the electric component is positioned in the center of the vehicle body forward of the rear wheel, making it difficult for the driver to touch the motor, and there is no need to cover the electric component entirely with the case portion. By forming an opening in the case portion, heat from the electric component is easily released from the opening in the case portion, and it is possible to suppress a decrease in performance of the electric component due to a rise in temperature of the electric component.

[0044] In the second aspect, in the first aspect, the swing arm has a left-right split structure composed of a pair of arm halves (41, 42), and a plurality of columnar parts (47, 48) extend inwardly in the left-right direction from the pair of arm halves, and the plurality of columnar parts form a case part. According to this configuration, the columnar parts of the pair of arm halves form a case part that surrounds an electric component and an opening that exposes the electric component.

[0045] In the third aspect, in the first or second aspect, the electric component is a motor. With this configuration, heat from the motor is easily released from the opening of the case, and it is possible to suppress a decrease in output due to an increase in the temperature of the motor. By moving the motor away from the rear wheel, vibrations caused by unevenness in the road surface are less likely to be transmitted to the motor, and the vibration resistance performance of the motor and fastening is alleviated. A large bending moment acts near the pivot part, but by forming the case part on the pivot part side, the pivot part side becomes wider, and the rigidity of the swing arm can be increased.

[0046] In the fourth embodiment, the periphery of the output shaft (32) of the motor in the third embodiment is in surface contact with the case. With this configuration, heat from the motor is transferred to the case, and the swing arm functions as a heat sink, thereby suppressing the temperature rise of the motor. Heat is efficiently transferred from the motor to the case using a wide area around the output shaft of the motor.

[0047] A fifth aspect is any one of the first to fourth aspects, in which an opening (58) is formed in the rear surface of the case part. With this configuration, hot air heated by the electric components can be released from the opening in the rear surface of the case part into a large rear space on the rear wheel side.

[0048] A sixth aspect is any one of the first to fifth aspects, in which an opening (56) is formed in the bottom surface of the case. With this configuration, hot air warmed by the electric components can be released from the opening in the bottom surface of the case by being carried by the running wind.

[0049] A seventh aspect is any one of the first to sixth aspects, in which an opening (55) is formed in the upper surface of the case. With this configuration, hot air that has been warmed by the electric components and become lighter can be released from the opening in the upper surface of the case.

[0050] An eighth aspect is any one of the first to seventh aspects, in which an opening (57) is formed in a front surface of the case part. According to this configuration, airflow is taken in through the opening in the front surface of the case part to cool the electric components.

[0051] In a ninth aspect, in the eighth aspect, the pivot portion is a pair of pivot portions spaced apart in the left-right direction, and the front space of the case portion expands in the left-right direction toward the front. With this configuration, the opening on the front surface of the case portion expands in the left-right direction, and more traveling wind is taken into the case portion, thereby effectively cooling the electrical components.

[0052] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0053] In addition, the technology of the present invention is not limited to the above examples, and may be modified, substituted, or altered in various ways without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to the progress of technology or a different technology derived therefrom, the invention may be implemented using that method. Therefore, the claims cover all embodiments that may be included within the scope of the technical idea. [Explanation of symbols]

[0054] 1: Saddle-type vehicle 10: Body frame 31: Motor (electrical parts) 32: Output shaft 40: Swing arm 41: Left arm half (arm half) 42: Right arm half (arm half) 43: Pivot part of left arm half 44: Pivot part of right arm half 47: Column part of left arm half 48: Right arm half column 49: Case part 52: Rear wheel support part 55: Opening on the top of the case 56: Opening on the bottom of the case 57: Front opening of case 58: Opening at rear of case

Claims

1. A saddle-type vehicle having a swing arm that is swingably supported on a vehicle body frame, The swing arm is a pivot portion that is connected to the vehicle body frame at a front end of the arm; a rear wheel support portion that rotatably supports a rear wheel at a rear end portion of the arm; a case portion for accommodating electrical components in a position forward of the rear end of the arm, A straddle-type vehicle, wherein the case portion is formed with an opening for exposing the electrical components to the outside.

2. The swing arm has a left-right split structure composed of a pair of arm halves, 2. The saddle-type vehicle according to claim 1, wherein a plurality of pillars extend inwardly in the left-right direction from the pair of arm halves, and the case portion is formed by the plurality of pillars.

3. 3. A saddle-type vehicle according to claim 1, wherein the electric component is a motor.

4. 4. The saddle-type vehicle according to claim 3, wherein a periphery of an output shaft of the motor is in surface contact with the case portion.

5. 3. The straddle-type vehicle according to claim 1, wherein the opening is formed in a rear surface of the case portion.

6. 3. The straddle-type vehicle according to claim 1, wherein the opening is formed in a lower surface of the case portion.

7. 3. The straddle-type vehicle according to claim 1, wherein the opening is formed in an upper surface of the case portion.

8. 3. The straddle-type vehicle according to claim 1, wherein the opening is formed in a front surface of the case portion.

9. The pivot portion is a pair of pivot portions spaced apart from each other in the left-right direction, 9. The straddle-type vehicle according to claim 8, wherein a front space of the case portion expands in the left-right direction toward the front.

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