Electric motorcycle

Abstract

The utility model discloses an electric motorcycle. The electric motorcycle comprises a frame, a walking system and a braking system. The walking system comprises walking wheels, and at least part of the walking wheels are arranged below the frame. The brake system comprises a brake disc coaxially connected with the walking wheels and brake calipers matched with the brake disc. The brake disc is provided with an annular speed measurement area, the annular speed measurement area and the walking wheel are coaxially arranged, a plurality of speed measurement holes which are sequentially and evenly distributed in the circumferential direction of the brake disc are formed in the annular speed measurement area, and the two ends of each speed measurement hole are connected with the edge of the annular speed measurement area in the radial direction of the brake disc. A plane parallel to the brake disc is defined as a brake transverse reference plane, and the orthographic projection of the brake calipers and the orthographic projection of the annular speed measurement area in the brake transverse reference plane are at least partially overlapped. Through the above arrangement, the measurement precision of the real-time speed of the electric motorcycle can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an electric motorcycle. BACKGROUND

[0002] As a kind of riding vehicle, electric motorcycle is more and more favored by consumers. Electric motorcycle is mainly used for personal travel, entertainment and leisure scenes; Especially in some mountainous cities, electric motorcycle becomes the preferred commuting and carrying due to its strong climbing ability and carrying capacity.

[0003] The existing electric motorcycle generally measures the wheel speed by cooperating the speed sensor with the counting disc coaxially installed on the wheel, so as to measure the speed of the electric motorcycle in real time. The counting disc is generally a disc with a plurality of counting holes, and the plurality of counting holes are arranged along the circumference of the counting disc. The speed measurement accuracy of the electric motorcycle is generally positively correlated with the number of counting holes, that is, the more the number of counting holes, the higher the speed measurement accuracy.

[0004] Since the electric motorcycle is also provided with a brake disc and a brake caliper cooperating with the brake disc, in order to prevent the counting disc from interfering with the brake caliper, the diameter of the counting disc cannot be further increased, so that the number of counting holes cannot be further increased, thereby causing the speed measurement accuracy of the electric motorcycle to be difficult to be further improved. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above problems of the prior art, the present application provides an electric motorcycle. The present application adopts the following technical scheme:

[0006] An electric motorcycle, comprising a frame, a vehicle body cover, a walking system, a power system and a braking system. The vehicle body cover is at least partially covered on the frame. The walking system comprises a walking wheel, and the walking wheel is at least partially arranged below the frame. The power system comprises a power battery and a driving motor, the driving motor is connected with the walking wheel, the power battery is electrically connected with the driving motor, and the power battery supplies power to the driving motor to drive the walking wheel. The braking system comprises a brake disc coaxially connected with the walking wheel and a brake caliper cooperating with the brake disc. The brake disc is provided with an annular speed measurement area, the annular speed measurement area is coaxially arranged with the walking wheel, and a plurality of speed measurement holes are arranged in the annular speed measurement area and uniformly distributed along the circumference of the brake disc. Along the radial direction of the brake disc, the two ends of the speed measurement hole are respectively connected with the edges of the annular speed measurement area. A plane parallel to the brake disc is defined as a brake transverse reference plane, and the normal projection of the brake caliper and the annular speed measurement area in the brake transverse reference plane at least partially overlaps.

[0007] Further, the speed measurement hole is strip-shaped, the length direction of the speed measurement hole is arranged along the radial direction of the brake disc, and the speed measurement hole is provided with a speed measurement transition round corner at both ends along the length direction thereof, and the inner walls of both sides of the speed measurement hole along the width direction thereof are tangent to the speed measurement transition round corner.

[0008] Further, the speed measurement hole is in a strip shape, a length direction of the speed measurement hole is arranged along a radial direction of the brake disc basically, a plane passing through a rotation center axis of the brake disc and a width center of the speed measurement hole is defined as a brake longitudinal reference surface, the brake longitudinal reference surface corresponds to the speed measurement hole one by one, and each speed measurement hole is arranged symmetrically along the corresponding brake longitudinal reference surface basically.

[0009] Further, the width of the speed measurement hole is 2mm to 6mm.

[0010] Further, the width of the speed measurement hole is 3.5mm to 4.5mm.

[0011] Further, the brake disc comprises a ring-shaped brake part and a brake connecting part connected with the ring-shaped brake part, the brake connecting part is connected with the road wheel, the ring-shaped speed measurement area is arranged on the ring-shaped brake part, a width of the ring-shaped speed measurement area along the radial direction of the ring-shaped brake part is D1, a width of the ring-shaped brake part along the radial direction of the ring-shaped brake part is D2, and a ratio of D1 to D2 is 0.2 to 0.6.

[0012] Further, the ratio of D1 to D2 is 0.2 to 0.3.

[0013] Further, the brake disc comprises a ring-shaped brake part and a brake connecting part connected with the ring-shaped brake part, the brake connecting part is connected with the road wheel, the ring-shaped speed measurement area is arranged on the ring-shaped brake part, the brake connecting part is in a ring shape coaxial with the ring-shaped brake part, and along a width direction of the vehicle frame, an outer edge of the brake connecting part is connected with an inner edge of the ring-shaped brake part.

[0014] Further, the brake caliper comprises a brake friction plate, and the brake friction plate does not overlap with the normal projection of any speed measurement hole on the brake transverse reference surface.

[0015] Further, the brake disc is provided with a plurality of brake heat dissipation holes, and the plurality of brake heat dissipation holes are uniformly distributed in the outer part of the ring-shaped speed measurement area along the circumferential direction of the brake disc.

[0016] The electric motorcycle provided by the application has the advantages that the speed measurement hole is arranged on the brake disc, the speed measurement hole can extend to a position in the covering range of the brake caliper, the distribution range of the speed measurement hole can be increased, the number of the speed measurement holes can be increased, and the measurement accuracy of the real-time speed of the electric motorcycle can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of an electric motorcycle provided by an embodiment of the application;

[0018] Figure 2 is a partial structure schematic view of an electric motorcycle provided by an embodiment of the application;

[0019] Figure 3is a front view of a brake disc and a brake caliper along the thickness direction of the brake disc provided by an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of a speed sensor and a control module provided by an embodiment of the present application;

[0021] Figure 5 is Figure 3 is an enlarged view at C;

[0022] Figure 6 is a structural schematic diagram of another brake disc provided by an embodiment of the present application. DETAILED DESCRIPTION

[0023] In the description of the embodiments of the present application, the words "exemplary", "or", "for example", etc. are used to mean as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or having more advantages than other embodiments or design schemes. Rather, the use of "exemplary", "or", "for example" and the like is intended to present the relevant concept in a specific manner.

[0024] The descriptions of "horizontal", "vertical", etc. described herein are not strictly "horizontal", "vertical" in the mathematical sense, and can be with an error of a certain angle, for example, 5° to 10°.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0026] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and examples can be combined with each other as long as there is no conflict.

[0027] As Figure 1 shown, the present application provides an electric motorcycle 100, which comprises a frame 11, a body cover 12, a walking system 13, a suspension system 14, a power system 15 and a brake system 17.

[0028] The body cover 12 at least partially covers the frame 11. The walking system 13 is at least partially arranged below the frame 11, and the walking system 13 comprises two walking wheels, i.e. a front wheel 131 and a rear wheel 132. The suspension system 14 is used to connect the front wheel 131 and the rear wheel 132 to the frame 11. The power system 15 is supported by the frame 11 and is used to drive the walking system 13. The brake system 17 is used to brake the electric motorcycle 100.

[0029] For the sake of clarity of the technical solutions of the present application, the front side, the rear side, the left side, the right side, the upper side and the lower side are defined as shown in the drawings. Figure 1 The front side, the rear side, the left side, the right side, the upper side and the lower side defined in the present embodiment are the directions when the electric motorcycle 100 is in a horizontal plane, the front-rear direction is the length direction of the electric motorcycle 100 provided by the present application, the left-right direction is the width direction of the electric motorcycle 100 provided by the present application, and the up-down direction is the height direction of the electric motorcycle 100 provided by the present application.

[0030] As shown in Figure 1 and Figure 2 The suspension system 14 includes a front fork 141, a rear fork 142 and a rear shock absorber 143. The front fork 141 is rotatably connected to the front end of the frame 11, and the front wheel 131 is rotatably connected to the lower end of the front fork 141. One end of the rear fork 142 is rotatably connected to the lower side of the frame 11, and the other end of the rear fork 142 extends rearward and is rotatably connected to the rear wheel 132. The rear shock absorber 143 connects the rear fork 142 and the rear side of the frame 11. The front fork 141 is connected to a steering handle 1411, and the front fork 141 can be rotated by operating the steering handle 1411 to steer the front wheel 131, thereby changing the moving direction of the electric motorcycle 100.

[0031] The power system 15 includes a driving motor 153 and a power battery (not shown in the drawings), and the power battery is at least partially supported by the frame 11. The driving motor 153 is electrically connected to the power battery. In some embodiments, the driving motor 153 is a side-hung motor, and the driving motor 153 is connected to the rear fork 142 and connected to the rear wheel 132. The power battery supplies power to the driving motor 153 to drive the driving motor 153 to rotate the rear wheel 132. In other embodiments, the driving motor 153 can be a hub motor, which can be understood as an integrated structure with the rear wheel 132.

[0032] The braking system 17 is provided with at least two groups, one of which corresponds to the front wheel 131, and the other of which corresponds to the rear wheel 132. The braking system 17 includes a brake disc 171, a brake caliper 172 and a brake driving member 173.

[0033] Taking the braking system 17 corresponding to the rear wheel 132 as an example, the brake disc 171 is fixedly connected coaxially with the hub of the rear wheel 132. It can be understood that the thickness direction of the brake disc 171 is substantially parallel to the left-right direction, that is, the thickness direction of the brake disc 171 is substantially parallel to the width direction of the frame 11.

[0034] As shown in Figure 2 and Figure 3As shown, the brake caliper 172 includes a caliper bracket 1721, a brake pump 1722 and brake friction pads 1723, the caliper bracket 1721 is sleeved on the brake disc 171 and fixedly connected with the rear fork 142, the brake pump 1722 is integrated in the caliper bracket 1721, and the brake friction pads 1723 are connected with the piston rod of the brake pump 1722. Figure 3 The brake friction pads 1723 in the caliper bracket 1721 are shielded, and are shown in a dashed line frame.

[0035] As shown in the drawings, Figures 1 to 3 The brake driving member 173 includes a brake handle 1731 and a brake oil pipe 1732, the brake handle 1731 is connected with the steering handle 1411, the brake oil pipe 1732 is connected with the brake handle 1731, and the end of the brake oil pipe 1732 away from the brake handle 1731 is connected with the brake pump 1722. By operating the brake handle 1731, the brake liquid in the brake oil pipe 1732 flows to the brake pump 1722, so that the piston rod of the brake pump 1722 drives the brake friction pads 1723 to move towards the brake disc 171 and abut against the brake disc 171, so as to drive the rear wheel 132 to brake by the brake disc 171.

[0036] In other embodiments, the brake handle 1731 can also be replaced by a brake pedal. It can be understood that the caliper bracket 1721 of the brake system 17 corresponding to the front wheel 131 is fixedly connected with the front fork 141.

[0037] In other embodiments, the brake caliper 172 can include a caliper bracket 1721, a rotating bracket rotatably connected with the caliper bracket 1721, and brake friction pads 1723 connected with the rotating bracket, and the brake driving member 173 includes a brake handle 1731 and a brake pull rope connected with the brake handle 1731, and the brake pull rope is connected with the rotating bracket. By operating the brake handle 1731, the brake pull rope drives the rotating bracket to rotate, so that the brake friction pads 1723 abut against the brake disc 171, thereby braking the corresponding front wheel 131 or rear wheel 132.

[0038] As shown in the drawings, Figure 1 , Figure 2 and Figure 4As shown, the electric motorcycle 100 further comprises an electrical system 18, which comprises a speed sensor 181 and a control module 182, the control module 182 comprising a body control module 1821 (BCM) and a display instrument 1824. The body control module 1821 is covered inside the body cover 12, the speed sensor 181 is fixedly connected with the rear fork 142 and electrically connected with the body control module 1821, and the display instrument 1824 is arranged at the front of the vehicle and electrically connected with the body control module 1821. In some embodiments, the speed sensor 181 is used to detect the rotating speed of the brake disc 171, the body control module 1821 converts the vehicle speed data of the electric motorcycle 100 according to the data measured by the speed sensor 181, and the display instrument 1824 is used to display the vehicle speed of the electric motorcycle 100.

[0039] As shown in Figure 2 and Figure 3 In some embodiments, the brake disc 171 comprises a ring-shaped braking portion 1711 and a braking connecting portion 1712 connected with the ring-shaped braking portion 1711. In some embodiments, the braking connecting portion 1712 is ring-shaped and coaxial with the ring-shaped braking portion 1711. The outer edge of the braking connecting portion 1712 is connected with the inner edge of the ring-shaped braking portion 1711 along the thickness direction of the brake disc 171. The braking connecting portion 1712 is sleeved on the rotating shaft of the rear wheel 132 and fixedly connected with the hub of the rear wheel 132 coaxially through bolts. The ring-shaped arrangement of the braking connecting portion 1712 can increase the length of the connecting portion between the ring-shaped braking portion 1711 and the braking connecting portion 1712, thereby improving the connecting strength between the ring-shaped braking portion 1711 and the braking connecting portion 1712. Wherein, the "edge" refers to the outer contour of the ring structure or shape, and the side of the outer contour close to the center of the ring structure or shape is the "inner edge", and the side of the outer contour away from the center of the ring structure or shape is the "outer edge".

[0040] The braking connecting portion 1712 is used to connect the ring-shaped braking portion 1711 and the hub 1322 of the rear wheel 132, and form a space for the caliper bracket 1721 to be inserted between the ring-shaped braking portion 1711 and the hub 1322 or the spoke 1323 of the rear wheel 132. In other embodiments, the braking connecting portion 1712 can also be a plurality of rod-shaped structures arranged in sequence along the circumference of the ring-shaped braking portion 1711.

[0041] The brake disc 171 is provided with a ring-shaped speed measuring area 1713 coaxial with the rear wheel 132. It can be understood that the ring-shaped speed measuring area 1713 is arranged on the ring-shaped braking portion 1711 and coaxial with the ring-shaped braking portion 1711. The brake disc 171 is provided with a plurality of speed measuring holes 1714, which are uniformly distributed in sequence within the ring-shaped speed measuring area 1713 along the circumference of the brake disc 171.

[0042] As shown in Figures 2 to 4 some embodiments, the speed sensor 181 is a Hall sensor, and the sensing end of the speed sensor 181 is arranged along the left-right direction towards the speed measurement hole 1714. The vehicle body controller 1821 converts the number of speed measurement holes 1714 detected by the speed sensor 181 in a unit time to obtain the rotation speed of the rear wheel 132, thereby obtaining the speed of the electric motorcycle 100. By arranging the speed measurement hole 1714 on the brake disc 171, the heat dissipation of the brake disc 171 can be accelerated to some extent, and the mass of the brake disc 171 can be reduced. Figure 3 The area between the two circular dashed lines in is the annular speed measurement area 1713, wherein the circular dashed line with a larger diameter represents the outer edge of the annular speed measurement area 1713, and the circular dashed line with a smaller diameter represents the inner edge of the annular speed measurement area 1713.

[0043] In some embodiments, the speed measurement hole 1714 is strip-shaped, and the length direction of the speed measurement hole 1714 is arranged substantially along the radial direction of the brake disc 171. Along the radial direction of the brake disc 171, the two ends of the speed measurement hole 1714 are respectively connected to the edges of the annular speed measurement area 1713. It can be understood that the two ends of the speed measurement hole 1714 along the radial direction of the brake disc 171 are respectively connected to the inner edge and the outer edge of the annular speed measurement area 1713.

[0044] A plane parallel to the brake disc 171 is defined as the brake transverse reference plane 101, and the orthographic projection of the caliper support 1721 of the brake caliper 172 and the annular speed measurement area 1713 in the brake transverse reference plane 101 at least partially overlaps. Through such an arrangement, the position of the speed measurement hole 1714 in the radial direction of the brake disc 171 can be made as far as possible from the central axis of the brake disc 171, so that the number of speed measurement holes 1714 can be increased without changing the shape and size of the speed measurement hole 1714 and the distance between adjacent two speed measurement holes 1714, thereby improving the measurement accuracy of the rotation speed of the rear wheel 132 (see Figure 2 ) and the real-time speed of the electric motorcycle 100.

[0045] In some embodiments, the width of the annular speed measurement area 1713 along the radial direction of the annular brake portion 1711 is D1, the width of the annular brake portion 1711 along its radial direction is D2, the ratio of D1 to D2 is m, and the value of m ranges from 0.2 to 0.3. In some embodiments, the value of m can be expanded to 0.2 to 0.6. Exemplarily, m can take any value in 0.2, 0.23, 0.25, 0.3, 0.35, 0.4, 0.45, 0.52, 0.56, 0.6.

[0046] As shown in Figure 3 and Figure 5As shown, in some embodiments, along the thickness direction of the brake disc 171, the distance between the inner edge of the annular speed measurement zone 1713 and the inner edge of the annular braking portion 1711 along the radial direction of the annular braking portion 1711 is K1, and K1 ranges from 0 to 3 mm, and exemplarily, K1 can be 0, 0.5 mm, 1.25 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 2.7 mm, or 3 mm. Through such a setting, the speed measurement hole 1714 can be made as close as possible to the inner side of the annular braking portion 1711, so as to make the speed measurement hole 1714 as far as possible from the brake friction plate 1723, thereby reducing the influence of the speed measurement hole 1714 on the braking effect as much as possible.

[0047] As an alternative, as shown in FIG. 6, the speed measurement hole 1714 can be a straight hole. Figure 5 As shown, the speed measurement hole 1714 includes a straight segment and a curved segment, and in this embodiment, the curved segment is a semicircular curved segment, and two curved segments are arranged at the two ends of the straight segment respectively, and the two curved segments are connected with the inner edge and the outer edge of the annular speed measurement zone 1713 respectively. The length of the straight segment along the radial direction of the annular braking portion 1711 is K2, and K2 ranges from 5 to 15 mm. Through such a setting, under the premise of ensuring the strength of the brake disc 171 and the performance of the brake, the detection range of the speed sensor 181 can be fully covered in the range of the straight segment, thereby ensuring the accuracy of the detection of the speed sensor 181.

[0048] As an alternative, in some embodiments, the brake friction plate 1723 and the orthographic projection of any speed measurement hole 1714 on the brake transverse reference surface 101 do not overlap. It can be understood that when the electric motorcycle 100 brakes, the brake friction plate 1723 does not contact any speed measurement hole 1714.

[0049] In some embodiments, the brake disc 171 is provided with a plurality of brake heat dissipation holes 1715, and the plurality of brake heat dissipation holes 1715 are uniformly distributed along the circumference of the brake disc 171 and located outside the annular speed measurement zone 1713 of the annular braking portion 1711. In some embodiments, the brake heat dissipation hole 1715 contacts the brake friction plate 1723 when the electric motorcycle 100 brakes, so as to facilitate the timely dissipation of heat generated during braking. Exemplarily, the brake heat dissipation hole 1715 is arranged on the side of the outer edge of the annular speed measurement zone 1713 away from the center of the annular braking portion 1711. In other embodiments, the brake heat dissipation hole 1715 can also be arranged on the side of the inner edge of the annular speed measurement zone 1713 close to the center of the annular braking portion 1711.

[0050] In other embodiments, the brake heat dissipation hole 1715 can be arranged on the brake connecting portion 1712.

[0051] In some embodiments, a plane perpendicular to the brake disc 171 and passing through the center of the width of the speed measurement hole 1714 is defined as a brake longitudinal reference plane 102, and the brake longitudinal reference plane 102 corresponds to the speed measurement hole 1714, and each speed measurement hole 1714 is substantially symmetrically arranged along the corresponding brake longitudinal reference plane 102. It can be understood that the width direction of the speed measurement hole 1714 is perpendicular to the corresponding brake longitudinal reference plane 102, and the inner walls on both sides of the speed measurement hole 1714 along the width direction thereof are substantially parallel to each other.

[0052] In some embodiments, the speed measurement hole 1714 is provided with a speed measurement transition fillet 1714a at both ends along the length direction thereof, and the inner walls on both sides of the speed measurement hole 1714 along the width direction thereof are tangent to the speed measurement transition fillet 1714a. By making the speed measurement hole 1714 extend in the radial direction of the brake disc 171 in a strip shape, the installation range of the speed sensor 181 can be increased and the installation accuracy requirement of the speed sensor 181 can be reduced. In other embodiments, the speed measurement hole 1714 can also be circular or elliptical or other shapes.

[0053] In some embodiments, the width of the speed measurement hole 1714 is D3, and the value range of D3 is 3.5mm to 4.5mm. In some embodiments, the value range of D3 can be expanded to 2mm to 6mm. Exemplarily, D3 can take any value of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.4mm, 6mm.

[0054] As shown in Figure 6 In some embodiments, the brake friction plate 1723 overlaps with the normal projection of the speed measurement hole 1714 on the brake transverse reference plane 101. By such an arrangement, the speed measurement hole 1714 functions as a heat dissipation hole, so that the heat generated during braking can be dissipated in time.

[0055] In some embodiments, at least one of the side of the inner edge of the annular brake portion 1711 close to the center of the annular brake portion 1711 and the side of the outer edge of the annular brake portion 1711 is provided with a brake heat dissipation hole 1715, so as to further facilitate the dissipation of heat generated during braking.

[0056] As shown in Figure 1 and Figure 2 In some embodiments, the brake disc 171 at the front wheel 131 is different in structure from the brake disc 171 at the rear wheel 132. Exemplarily, the brake disc 171 at the front wheel 131 is not provided with a speed measurement hole 1714, instead, a separate speed measurement disc is coaxially fixedly connected to the front wheel 131, and the speed measurement hole 1714 is arranged on the speed measurement disc, and correspondingly, the speed sensor 181 is also installed on the front fork 141 to detect the rotational speed of the front wheel 131.

[0057] In comparison, by arranging the speed measuring hole 1714 on the brake disc 171, the speed measuring disc can be omitted, thereby the operation of assembling the brake disc 171 can be omitted and the cost of the electric motorcycle 100 can be reduced, and meanwhile the mounting space between the rear wheel 132 and the rear fork 142 can be increased to facilitate the installation of the side-hung motor and other structures. In other embodiments, the speed sensor 181 can not be arranged at the front wheel 131, that is, only the rotational speed of the rear wheel 132 is measured. In other embodiments, the structure of the brake disc 171 at the front wheel 131 can be the same as that of the brake disc 171 at the rear wheel 132.

[0058] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. An electric motorcycle, comprising: a frame; a body cover, which is at least partially covered on the frame; a walking system, which comprises a walking wheel, the walking wheel being at least partially disposed below the frame; a power system, which comprises a power battery and a driving motor, the driving motor being connected with the walking wheel, the power battery being electrically connected with the driving motor, the power battery supplying power for the driving motor to drive the walking wheel; a braking system, which comprises a brake disc coaxially connected with the walking wheel and a brake caliper matched with the brake disc; characterized in that the brake disc is provided with an annular speed measurement zone, the annular speed measurement zone is coaxially arranged with the walking wheel, a plurality of speed measurement holes are arranged in the annular speed measurement zone, the speed measurement holes are uniformly distributed along the circumferential direction of the brake disc, and the two ends of the speed measurement holes are respectively connected with the edges of the annular speed measurement zone along the radial direction of the brake disc; a plane parallel to the brake disc is defined as a braking transverse reference plane, and the normal projections of the brake caliper and the annular speed measurement zone in the braking transverse reference plane at least partially overlap.

2. The electric motorcycle according to claim 1, characterized in that, The speed measurement hole is strip-shaped, the length direction of the speed measurement hole is arranged along the radial direction of the brake disc, the speed measurement hole is provided with a speed measurement transition fillet at both ends along the length direction of the speed measurement hole, and the inner walls of both sides of the speed measurement hole along the width direction of the speed measurement hole are tangent to the speed measurement transition fillets.

3. The electric motorcycle of claim 1, wherein, The speed measurement hole is strip-shaped, the length direction of the speed measurement hole is arranged along the radial direction of the brake disc, a plane passing through the rotation center axis of the brake disc and the width center of the speed measurement hole is defined as a braking longitudinal reference plane, the braking longitudinal reference plane corresponds to the speed measurement hole one by one, and each speed measurement hole is arranged symmetrically along the corresponding braking longitudinal reference plane.

4. The electric motorcycle according to claim 3, characterized in that, The width of the speed measurement hole is 2 mm to 6 mm.

5. The electric motorcycle according to claim 4, characterized in that, The width of the speed measurement hole is 3.5 mm to 4.5 mm.

6. The electric motorcycle of claim 1, wherein, The brake disc comprises an annular braking portion and a braking connecting portion connected with the annular braking portion, the braking connecting portion is connected with the walking wheel, the annular speed measurement zone is arranged in the annular braking portion, the width of the annular speed measurement zone along the radial direction of the annular braking portion is D1, the width of the annular braking portion along the radial direction of the annular braking portion is D2, and the ratio of the D1 to the D2 is 0.2 to 0.

6.

7. The electric motorcycle of claim 6, wherein, The ratio of the D1 to the D2 is 0.2 to 0.

3.

8. The electric motorcycle of claim 1, wherein, The brake disc comprises an annular braking portion and a braking connecting portion connected with the annular braking portion, the braking connecting portion is connected with the walking wheel, the annular speed measurement zone is arranged in the annular braking portion, the braking connecting portion is annular and coaxial with the annular braking portion, and the outer edge of the braking connecting portion is connected with the inner edge of the annular braking portion along the width direction of the frame.

9. The electric motorcycle of claim 1, wherein, The brake caliper comprises a brake friction plate, and the normal projection of the brake friction plate in the braking transverse reference plane does not overlap with any speed measurement hole.

10. The electric motorcycle of claim 1, wherein, The brake disc is provided with a plurality of brake heat dissipation holes, and the brake heat dissipation holes are uniformly distributed in the outer portion of the annular speed measurement zone along the circumferential direction of the brake disc.

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