JP5561074B2 - Electric vehicle swing arm - Google Patents

Description

  The present invention relates to a swing arm of an electric vehicle using an electric motor such as an electric scooter type vehicle as a drive source.

  Conventionally, an electric vehicle using an electric motor as a drive source, such as an electric scooter type vehicle, has been developed, and a power unit is provided in this type of electric vehicle.

  The power unit is mounted on a swing arm. The swing arm includes a pivot shaft support portion supported by the vehicle body frame by a pivot shaft, an arm portion extending rearward from the pivot shaft support portion, and a rear end portion of the arm portion. An in-foil motor storage support part that stores the in-foil motor so as to cover the in-foil motor from the outside is integrally formed. And the in-foil motor accommodation support part of this swing arm has a circular flat plane by side view (for example, refer patent document 1).

Japanese Patent Laid-Open No. 7-108837

  However, since the swing arm that mounts the power unit of the conventional electric vehicle described above is integrally formed of the same material such as aluminum, for example, the flat portion of the in-foil motor storage portion is operated by the in-foil motor. There is a problem in that it acts as a resonance plate that resonates with vibration and noise at times, and may amplify vibration and noise.

  Therefore, in order to solve such problems, it is conceivable to increase the rigidity of the in-foil motor housing portion to remove the resonance frequency from the human audible frequency range. Since it is necessary to increase the wall thickness, the weight of the swing arm (ie, unsprung weight) increases, the wheel's ability to follow the road surface unevenness decreases, and the shock absorption and stability during driving deteriorate. There was a problem that there was a risk of.

  The present invention has been made to solve the above-described problems, and can reduce vibration and noise during operation of the in-foil motor, reduce the weight of the swing arm, and absorb shock when traveling. It is another object of the present invention to provide a swing arm for an electric vehicle that can improve stability.

In order to achieve the above-described object, the present invention provides a pivot shaft support portion supported on a vehicle body frame by a pivot shaft in a swing arm of an electric vehicle having an in-wheel motor that directly drives a rear wheel, and the pivot shaft. An arm portion extending rearward from the support portion;
An in-foil motor storage support portion that stores the in-foil motor so as to cover the in-foil motor from the outside at the rear end portion of the arm portion is integrally formed, and an opening is formed on the outer surface of the in-foil motor storage support portion The opening is closed by a separate cover member made of a material different from that of the in-wheel motor storage support.

  According to this feature, the opening formed on the outer surface of the in-wheel motor storage support portion is closed by a separate cover member made of a material different from that of the in-wheel motor storage support portion. The member can be prevented from resonating with vibration and noise during operation of the in-foil motor, vibration and noise can be reduced, the swing arm can be reduced in weight, and shock can be absorbed during traveling. And stability can be improved.

  Further, in the swing arm of the electric vehicle according to the present invention, the in-wheel motor storage support portion is formed in a bowl shape, and the in-wheel motor is fixed to an inner peripheral edge of the in-wheel motor storage support portion. It is preferable that the boss part for carrying out is formed integrally.

  According to this feature, since the boss portion for fixing the in-foil motor is formed integrally with the in-foil motor storage support portion, the number of parts can be reduced and the in-foil motor storage support It is possible to simplify the work of attaching the in-wheel motor to the part.

  In the swing arm of the electric vehicle according to the present invention, it is preferable that an opening reinforcing portion is formed along the outer periphery of the opening portion in the in-wheel motor housing support portion.

  According to this feature, the in-wheel motor storage support portion and the swing arm can be held at a predetermined strength.

  In the swing arm of the electric vehicle according to the present invention, it is preferable that the cover member is formed of a resin material or rubber.

  According to this feature, vibration and noise during operation of the in-wheel motor can be further reduced, and shock absorption and stability during travel can be further increased.

  According to the present invention, it is possible to reduce vibration and noise during operation of the in-foil motor, reduce the weight of the swing arm, improve shock absorption and stability during travel, and so on. The excellent effect can be obtained.

1 is a left side view of an electric scooter type vehicle in an embodiment of the present invention. It is a left view which shows the swing arm carrying the swing arm of the electric scooter type vehicle which concerns on embodiment of this invention. It is a right view which shows the swing arm carrying the swing arm of the electric scooter type vehicle which concerns on embodiment of this invention. It is BB sectional drawing of FIG. It is a back perspective view showing partially the swing arm carrying the swing arm of the electric scooter type vehicle according to the embodiment of the present invention.

  Hereinafter, a swing arm of an electric scooter type vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the front of the vehicle is indicated by an arrow Fr, the rear of the vehicle is indicated by an arrow Rr, the right side of the vehicle is indicated by an arrow R, and the left side of the vehicle is indicated by an arrow L, as necessary.

  First, an overall configuration of an electric scooter type vehicle 10 according to an embodiment of the present invention will be schematically described with reference to FIG. Here, FIG. 1 shows a left side view of the electric scooter type vehicle 10 according to the embodiment of the present invention.

  A body frame 11 of the electric scooter type vehicle 10 includes a head pipe (not shown), a down tube 12 that extends downward from the head pipe, and extends substantially horizontally from the middle toward the rear. The left and right rear frames 13 extend rearward and upward from the end portions. In addition, left and right auxiliary frames (not shown) are extended horizontally or slightly rearward from the lower part of the down tube 12 and are connected to the rear frame 13 respectively.

  The left and right front forks 14 are supported by the head pipe of the vehicle body frame 11 so as to be able to turn left and right. A front wheel 15 is rotatably supported at the lower part of the front fork 14. 15 is steered left and right.

  The brackets 17 provided at the lower portions of the left and right rear frames 13 support the front end of a swing arm 19 via a pivot shaft 18 so that the swing arm 19 can swing up and down ( (See arrow A in FIG. 1). The swing arm 19 extends rearward only on the left side of the vehicle, and a rear wheel 21 attached to the foil 20 is supported in a cantilever manner at the rear end thereof. A rear suspension 22 is mounted between the rear end of the swing arm 19 and the rear frame 13, and the rear suspension 22 is also disposed only on the left side of the vehicle. Further, left and right support brackets 23 are provided in the middle of the swing arm 19, and a stand 24 is rotatably mounted on the support bracket 23.

  The body frame 11 is covered with a resin body cover, and the exterior of the vehicle is formed by the body cover. The vehicle body cover includes a front leg shield 25, a rear leg shield 26, a lower cover 27, a rear frame cover 28, and the like. By combining or combining them in a predetermined form and arrangement, the electric scooter type vehicle 10 Is configured with various functions as well as appearance.

  The front leg shield 25 is arranged so as to cover the front part of the vehicle body, and also functions as a front fender that covers the upper part of the front wheel 15. The rear leg shield 26 is disposed so as to cover the rear side of the front leg shield 25, and a storage pocket portion 26a is formed. Further, the lower cover 27 is connected to the front leg shield 25 and is disposed so as to cover the lowermost part of the driving seat 29 from the left and right auxiliary frames. The lower cover 27 is provided with a step floor on which a rider puts his / her foot. A controller unit for controlling the in-wheel motor 31 of the power unit 30 is housed in a recess formed in the step floor. Further, the rear frame cover 28 is disposed so as to cover the rear frame 13 below the operation seat 29. Furthermore, a rear fender 32 is disposed above the rear wheel 21.

  A meter unit 33 including a speedometer and the like is disposed at the center of the handle bar 16. A large basket 34 is attached to the front of the vehicle, and a carrier 35 is attached above the rear fender 32 at the rear of the vehicle.

  Next, the swing arm of the electric scooter type vehicle according to the embodiment of the present invention will be described with reference to FIGS.

  The swing arm 19 extends left and right at the front end, and is supported by the body frame 11 by the pivot shaft 18. A hollow tubular arm portion 37 extends rearward from the left side of the pivot shaft support 36. An in-foil motor storage support portion 38 that stores the rear portion of the arm portion 37 so as to cover the in-wheel motor 31 from the outside is integrally formed.

  The in-foil motor storage support portion 38 is formed in a bowl shape that is substantially circular in a side view, and a circular opening portion in a side view is formed on the outer side surface corresponding to the bottom surface of the bowl shape of the in-foil motor storage support portion 38. 60 is formed. And this opening part 60 is obstruct | occluded with the separate cover member 61, and this cover member 61 is formed with the material different from the in-foil motor accommodation support part 38, such as a resin material or rubber | gum, for example. Further, the in-wheel motor storage support portion 38 is formed with an opening reinforcement portion 41 along the outer periphery of the opening portion 60, thereby holding the in-wheel motor storage support portion 38 and the swing arm 19 at a predetermined strength. It can be done.

  An axle 39 is horizontally mounted in the center of the in-wheel motor storage support portion 38, and the axle 39 is rotatably supported by a holder 42 via bearings 40 and 41, and a wheel 43 and a wheel hub 44 coupled to the axle 39. Thus, the rear wheel 21 is supported.

  A boss portion 46 is integrally formed on the outer peripheral edge portion on the inner side of the in-wheel motor storage support portion 38, and the holder 42 is fastened to the boss portion 46 by a plurality of bolts 55. Thus, the in-wheel motor 31 is fixed inside the in-wheel motor housing support portion 38. The in-wheel motor 31 has a flat, substantially cylindrical shape or a thin drum shape, and is mounted coaxially with the axle 39 of the rear wheel 21.

  A motor shaft 47 is horizontally mounted in the center of the in-wheel motor 31, and the motor shaft 47 is rotatably supported via a bearing 48. One end side of the motor shaft 47 extends to the gear chamber 49 and is coaxially connected to the axle 39 via a speed reducer made up of a gear group disposed in the gear chamber 49.

  A drum type brake device 45 is disposed between the swing arm 19 and the wheel 43 of the rear wheel 21 supported on the rear end of the swing arm 19. The wheel hub 44 of the wheel 43 is formed in a concave shape on the side facing the holder 42, and a space or a space is formed between them. And in this space, the boss | hub part 42a of the holder 42 protrudes toward the wheel hub 44 side.

  A substantially disc-shaped brake plate 50 is concentrically fixed to the boss portion 42 a of the holder 42. An anchor pin 52 for supporting the brake shoe 51 is implanted below the axle 39 on the brake plate 50. A brake cam 53 is rotatably supported on the brake plate 50 on the opposite side of the anchor pin 52 across the axle 39. The brake cam 53 serves as a contact portion with the brake shoe 51 and has cam surfaces having different large and small diameters. And according to the rotation angle, the mutual space | interval of the contact part of the brake shoe 51 can be made wide, and the diameter as the brake shoe 51 whole can be changed in size.

  In order to rotationally drive the brake cam 53, a brake cam lever 54 is provided, and a base end portion of the brake cam lever 54 is supported so as to be rotatable around a support shaft implanted in the holder 42. The brake cam lever 54 is disposed above and in front of the motor shaft 47 in a side view. Further, the base end portion of the brake cam lever 54 is concentrically coupled with the brake cam 53, and both rotate integrally. A lever guard 56 is laid on the brake plate 50 side of the brake cam lever 54 to protect the brake cam lever 54 as a guide. The lever guard 56 is fastened and fixed to the holder 42 by bolts 57. Further, the brake cam lever 54 is operated by a brake operation lever 58 (see FIG. 1) disposed on the handle bar 16.

  On the other hand, a brake drum 59 is disposed along the outer periphery of the brake shoe 51 so as to face the brake plate 50. The brake drum 59 is integrally connected to the wheel hub 44, and these rotate together with the axle 39. The outer peripheral surface of the brake shoe 51 is in pressure contact with the inner peripheral surface of the brake drum 59, so that a braking force acts on the axle 39 and the rear wheel 21.

  In the above-described embodiment, the case where the swing arm 19 and the power unit 30 are arranged on the left side of the vehicle is described as an example. However, the left and right sides can be reversed.

  In the embodiment of the present invention, the case where the present invention is applied to the electric scooter type vehicle 10 is illustrated and described. However, this is not intended to limit the present invention to this case, and the present invention is not limited to this. The present invention can also be applied to so-called motor chairs, senior cars, bicycle-type electric vehicles, and the like in the same manner as the above-described embodiment, and the same action can be obtained.

  Furthermore, in the above-described embodiment of the present invention, since the preferred embodiment of the present invention is described, there may be various technically preferable limitations, but the technical scope of the present invention is Unless otherwise specifically limited, the present invention is not limited to these embodiments. In addition, the components in the above-described embodiment of the present invention can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention described above does not limit the contents of the invention described in the claims.

DESCRIPTION OF SYMBOLS 10 Electric scooter type vehicle 11 Body frame 18 Pivot shaft 19 Swing arm 21 Rear wheel 31 In-wheel motor 36 Pivot shaft support part 37 Arm part 38 In-wheel motor storage support part 41 Opening reinforcement part 46 Boss part 60 Opening part 61 Cover member

Claims (3)

In the swing arm of an electric vehicle equipped with an in-wheel motor that directly drives the rear wheel,
A pivot shaft support portion supported by the body frame by the pivot shaft;
An arm portion extending rearward from the pivot shaft support portion;
An in-foil motor storage support part that stores the in-foil motor from the outside at the rear end of the arm part; and
Are formed integrally, and an opening is formed on the outer surface of the in-foil motor storage support, and the opening is closed by a separate cover member made of a material different from that of the in-foil motor storage support . A swing arm for an electric vehicle , wherein an opening reinforcing portion is formed along an outer periphery of the opening portion in the in-wheel motor storage support portion .   The in-foil motor storage support part is formed in a bowl shape, and a boss part for fixing the in-foil motor is integrally formed on the inner peripheral edge of the in-foil motor storage support part. The swing arm of the electric vehicle according to claim 1, wherein the swing arm is an electric vehicle. The swing arm for an electric vehicle according to claim 1, wherein the cover member is made of a resin material or rubber .

Images