Middle motor and electric motorcycle

Abstract

The embodiment of the utility model provides a middle motor and an electric motorcycle. The built-in motor comprises a shell assembly and a sealing assembly. The sealing assembly and the shell assembly are matched with each other to define a closed containing space. The stator assembly is accommodated in the accommodating space; the stator assembly includes: a stator core; the shell assembly is in interference fit with the stator core and is connected with the stator core through a fixing pin so as to limit relative sliding between the stator core and the shell assembly; a rotor assembly disposed inside the stator core; the rotor assembly comprises a rotor core, a pair of rotor end plates and a rotating shaft. The pair of rotor end plates are detachably arranged at the two ends, deviating from each other, of the rotor iron core; the rotating shaft is in interference fit with the rotor core, and concave-convex textures are arranged on the surface of the rotating shaft so as to limit relative sliding between the rotating shaft and the rotor core. The high protection requirement in a cross-country scene can be met, the rotor assembly is convenient to disassemble, and the rotor assembly has the advantages of simple structure and light weight.

Description

Technical Field

[0001] The utility model relates to the technical field of mid-mounted motors, and in particular to a high-protection mid-mounted motor and an electric motorcycle suitable for off-road scenes. Background Art

[0002] With the development of the economy and the advancement of new energy technology, people are pursuing higher and higher enjoyment of life. Using electric motorcycles for off-road has gradually been loved by more and more young people. At the same time, with the vigorous promotion of new energy, new electric motorcycles have developed rapidly, bringing more challenges and opportunities to electric motorcycles. The mid-mounted motor of electric motorcycles used in off-road scenes is a key core component, and the performance requirements are becoming more and more extreme.

[0003] One important aspect of improving the performance of electric motorcycles is weight reduction, which can improve vehicle endurance and vehicle trafficability. However, in order to pursue high torque and high power, the current mid-mounted motor has become larger and larger in size and mass, which will affect the vehicle's endurance. The driving gear involved in the transmission of the mid-mounted motor will also increase in size and mass as the transmission ratio and power increase.

[0004] Moreover, most of the existing electric motorcycles are designed for urban roads, so the protection capabilities and environmental adaptability of their mid-mounted motors are relatively poor; therefore, traditional mid-mounted motors are difficult to meet the off-road users' pursuit of climbing, wading, muddy roads, etc. Utility Model Content

[0005] The mid-mounted motor and electric motorcycle provided by the utility model are intended to solve at least one defect of the existing mid-mounted motor.

[0006] In a first aspect, the utility model provides a mid-mounted motor. The mid-mounted motor comprises:

[0007] A shell assembly and a sealing assembly; the sealing assembly cooperates with the shell assembly to enclose and form a closed receiving space;

[0008] A stator assembly accommodated in the accommodation space; the stator assembly comprises: a stator core; at least a portion of the housing assembly is configured to be interference fit with the stator core, and is connected by a fixing pin to limit relative sliding between the stator core and the housing assembly;

[0009] A rotor assembly at least part of which is arranged inside the stator core; the rotor assembly includes: a rotor core, a pair of rotor end plates and a rotating shaft; the pair of rotor end plates are detachably arranged at two ends of the rotor core that are away from each other; an interference fit is arranged between the rotating shaft and the rotor core, and a concave-convex texture is arranged on the surface of the rotating shaft to limit relative sliding between the rotating shaft and the rotor core.

[0010] In some embodiments, a first through hole adapted to the rotating shaft is formed on the rotor core; a second through hole adapted to the rotating shaft is formed on the rotor end plate;

[0011] The outer surface of the rotating shaft is provided with at least one shaft flattened position, the first through hole is provided with at least one first hole flattened position adapted to the shaft flattened position, and the second through hole is provided with at least one second hole flattened position adapted to the shaft flattened position;

[0012] Among them, the shaft flattening position and the first hole flattening position cooperate with each other to achieve the positioning and assembly between the rotating shaft and the rotor core; the shaft flattening position and the second hole flattening position cooperate with each other to achieve the positioning and assembly between the rotating shaft and the rotor end plate.

[0013] In some embodiments, the housing assembly comprises:

[0014] A housing; the housing having a first end and a second end opposite to each other;

[0015] A front end cover; the front end cover has a first end face and a second end face which are opposite to each other; the first end face is in contact with the first end; a mounting through hole which is adapted to the rotating shaft is provided on the front end cover; an oil seal groove which extends in a circumferential direction and is close to the second end face is provided in the mounting through hole;

[0016] A rear end cover; one end of the rear end cover is in contact with the second end, and the other end is connected to the rear cover plate; the rear end cover is provided with a plurality of step holes;

[0017] A plurality of connectors cooperate with the step holes; the plurality of connectors are used to connect a plurality of external wiring harnesses; the external wiring harnesses are electrically connected to the coil windings of the stator assembly.

[0018] In some embodiments, the front end cover is provided with a first convex ring protruding from the first end surface; a first accommodating groove extending in the circumferential direction is provided on the outer surface of the first convex ring;

[0019] Wherein, the rear end cover is provided with a second convex ring protruding from the end surface of the rear end cover abutting against the second end; the outer surface of the second convex ring is provided with a second receiving groove extending in the circumferential direction;

[0020] Among them, the rear cover plate has a first connecting part and a second connecting part; the second connecting part protrudes from the surface of the first connecting part; an installation groove adapted to the second connecting part is provided at one end of the rear end cover away from the second protruding ring; when the first connecting part abuts against the rear end cover, the second connecting part extends into the installation groove; a third accommodating groove extending circumferentially is provided in the installation groove.

[0021] In some embodiments, the sealing assembly comprises:

[0022] a first sealing ring received in the first receiving groove; when the first end surface of the front end cover abuts against the first end of the housing, the first sealing ring abuts against the housing to fill the gap between the outer surface of the first convex ring and the inner surface of the housing;

[0023] a second sealing ring received in the second receiving groove; when the rear end cover abuts against the second end of the housing, the second sealing ring abuts against the housing to fill the gap between the outer surface of the second convex ring and the inner surface of the housing;

[0024] A third sealing ring is accommodated in the third accommodating groove; when the first connecting portion of the rear cover plate abuts against the end of the rear end cover away from the second protruding ring, the third sealing ring abuts against the second connecting portion to fill the gap between the surface of the mounting groove and the outer surface of the second connecting portion.

[0025] In some embodiments, the sealing assembly further comprises:

[0026] an oil seal component received in the oil seal groove;

[0027] The rotating shaft has an oil seal position corresponding to the oil seal groove; when the rotating shaft passes through the mounting through hole, the oil seal component abuts against the rotating shaft at the oil seal position to fill the gap between the surface of the mounting through hole and the outer surface of the rotating shaft;

[0028] The oil seal component, the front end cover, the first sealing ring, the housing, the second sealing ring, the rear end cover, the third sealing ring and the rear cover plate together form the receiving space.

[0029] In some embodiments, a threaded connection portion is disposed at one end of the rotating shaft, and the threaded connection portion extends out of the receiving space;

[0030] The other end of the rotating shaft is provided with a first groove extending in the axial direction; a boss is provided in the first groove, protruding from the bottom surface of the first groove; an exhaust notch extending in the radial direction is provided at the edge of the first groove, and the exhaust notch is in the shape of an arc;

[0031] Among them, the axial dimension of the boss is smaller than the axial dimension of the first groove; there is a preset spacing range between the axis of the exhaust notch and the axis of the rotating shaft; and the exhaust notch has a preset radius range.

[0032] In some embodiments, the rotor assembly comprises:

[0033] A magnetic sheet; the magnetic sheet is detachably connected to the rotor core;

[0034] An induction magnetic sheet; at least a portion of the induction magnetic sheet is accommodated in the first groove, and the induction magnetic sheet is detachably connected to the boss; a glue overflow space is formed between the bottom surface of the first groove and the induction magnetic sheet; the glue overflow space has a preset width range in the radial direction and a preset depth range in the axial direction;

[0035] The preset spacing range is: R0-0.6R1 to R0+0.6R1, wherein R0 is the outer diameter of the induction magnetic sheet, and R1 is the preset radius range of the exhaust gap, which is 1 mm to 2 mm;

[0036] The preset width range is from one quarter of R0 to one third of R0, and is not less than 1 mm; the preset depth range is greater than 0.3T1 to limit the floating of the induction magnetic sheet, wherein T1 is the axial dimension of the induction magnetic sheet.

[0037] In some embodiments, a second groove and a third through hole arranged in the circumferential direction are provided at the edge of the rotor end plate;

[0038] The radial dimension of the second groove has a preset length range; the preset length range is: 0.5R2 to 0.6R2, wherein R2 is the outer diameter dimension of the rotor end plate;

[0039] Wherein, the third through hole is a waist-shaped hole having a preset diameter range; the preset diameter range is: 1.7R1 to 1.9R1, so as to limit the movement of the magnetic sheet so that the magnetic sheet is exposed;

[0040] Wherein, the rotor assembly also includes: two sleeves and two bearings; the two bearings are sleeved on the rotating shaft with their backs to each other and are both far away from the two ends of the rotor core; one end of the sleeve abuts against the rotor end plate, and the other end abuts against the rotor core to limit the axial movement of the rotor end plate.

[0041] In a second aspect, the utility model provides an electric motorcycle. The electric motorcycle comprises:

[0042] The electric scooter body, the above-mentioned central motor and the transmission device; the electric scooter body includes an electric scooter frame and a motion carrier;

[0043] The central motor is contained in the electric motorcycle frame and drives the motion carrier through the transmission device; the transmission device includes a driving gear; the driving gear is detachably connected to the rotating shaft of the central motor and is located at one end of the rotating shaft close to the threaded connection part;

[0044] Wherein, the driving gear is provided with a plurality of third grooves; the driving gear has an inner hole and an outer ring, the inner hole is cylindrical, and the outer ring is elliptical.

[0045] Preferably, a pin hole matching the fixing pin is provided on the side of the stator core; the same pin hole is also provided on the side of the casing; the stator core can also be fixed to the casing by the fixing pin to further ensure a reliable connection between the casing and the stator assembly.

[0046] Preferably, the connector can be a waterproof connector with waterproof performance; the step hole and the waterproof connector cooperate with each other to effectively isolate the external space and the internal space of the rear end cover, further improve the protection of the mid-mounted motor, and can isolate the external pollution source (moisture or dust) entering from the joint between the waterproof connector and the rear end cover in the step hole.

[0047] Preferably, the first sealing ring, the second sealing ring and the third sealing ring are all suitable for static sealing conditions, while the oil seal component is suitable for dynamic sealing conditions; wherein, static sealing refers to a seal formed between two relatively stationary components, when there is no relative movement between the two components; and dynamic sealing refers to a seal formed between two relatively moving components, when there is relative movement between the two components.

[0048] Preferably, the concave-convex texture provided on the rotating shaft may be knurling; the knurling can accommodate lubricant to form an oil film, thereby reducing the friction of the rotating shaft during the fitting process; compared with a smooth shaft surface, a shaft surface with knurling can provide a larger surface area, increase the lubrication effect, thereby reducing the friction resistance of the shaft, thereby reducing the difficulty of inserting the rotating shaft; moreover, the knurling can also disperse stress concentration, reduce the pressure between the rotating shaft and the mating part, thereby reducing the difficulty of inserting the rotating shaft; in addition, the knurling can also improve the self-centering property of the rotating shaft (the self-centering property refers to the ability of the shaft to automatically adjust and align to the correct position during the assembly process; if the shaft surface is smooth, it is easy to cause the shaft to be offset or misaligned), which can reduce the difficulty of inserting the rotating shaft; therefore, by arranging knurling on the surface of the rotating shaft, the difficulty of inserting the rotating shaft can be effectively reduced, thereby improving assembly efficiency and assembly quality.

[0049] Preferably, a plurality of receiving grooves are provided on the end surface of the rotor core, and the receiving grooves are used to receive the magnetic sheets; the magnetic sheets and the rotor core can be bonded together using high-temperature glue, and the mutual cooperation of the sleeve, the bearing and the rotor end plate can prevent the magnetic sheets from loosening and flying out.

[0050] Preferably, the rotor end plate may also include a plurality of exhaust holes and balancing grooves; the exhaust holes facilitate heat dissipation of the rotor core, and the balancing grooves are used to stick balancing mud; the magnetic sheet may expose the third through hole of the rotor end plate, so that the rotor end plate can not only effectively press the magnetic sheet, but also enable the magnetic sheet to be ejected and repaired when it is assembled and inserted in reverse.

[0051] Preferably, the rotating shaft is made of non-magnetic conductive material, which can effectively prevent the performance degradation of the induction magnetic sheet, thereby solving the defect that the traditional induction magnetic sheet needs to use aluminum screws or other non-magnetic conductive materials for transitional installation.

[0052] Preferably, at least one shaft flattening position is provided on the rotating shaft; the rotor core and the rotor end plate are both provided with hole flattening positions that are compatible with the shaft flattening position, which can simplify the installation and positioning process of the rotating shaft, thereby ensuring a reliable connection between the rotating shaft and the rotor core and the rotor end plate; wherein, the shaft flattening position refers to a plane cut on the shaft surface, and the distance from the plane to the axis is less than the radius of the shaft, and the shaft flattening position and the hole flattening position cooperate with each other to achieve positioning, assembly and reliable installation.

[0053] Preferably, a heat assembly process is adopted between the casing and the stator core, that is, the casing is heated to expand and then immediately pressed into the stator core, and after the casing is cooled, an interference fit can be achieved between the casing and the stator core.

[0054] Preferably, a first group of connecting holes is also provided on the second end face of the front end cover; the first group of connecting holes has two holes in total, and the distance between the two holes is 170±0.5mm; and a second group of connecting holes is also provided on the end of the rear end cover away from the second protruding ring; the second group of connecting holes has two holes in total, and the distance between the two holes is also 170±0.5mm; in addition, the distance between the first group of connecting holes and the second group of connecting holes is 142.5±0.5mm.

[0055] Preferably, the outer diameter of the first groove is comparable to the outer diameter of the induction magnetic sheet.

[0056] Preferably, the driving gear is provided with a plurality of third grooves, which can reduce the weight of the driving gear, thereby reducing the cogging torque of the driving gear (since the weight of the driving gear will directly affect the inertia moment and rotational inertia of the driving gear, therefore, when the weight of the driving gear is reduced, its inertia moment and rotational inertia will also decrease, thereby causing a corresponding reduction in the cogging torque of the driving gear), so as to reduce the inertia load of the transmission system and improve the transmission efficiency; moreover, reducing the weight of the driving gear can also reduce the influence of centrifugal force and inertia force on the driving gear, thereby improving the reliability and stability during the transmission process.

[0057] Preferably, the motion carrier may be a tire of the electric motorcycle.

[0058] At least one beneficial effect of the mid-mounted motor and electric motorcycle provided by the embodiments of the utility model is: a new type of mid-mounted motor is proposed, and a sealing component is added to achieve better sealing between the front cover and the casing, between the rear cover and the casing, between the rear cover plate and the front cover plate, and between the rotating shaft and the front cover; the step hole and the connector cooperate with each other to achieve better sealing between the external wiring harness and the rear cover, thereby improving the protection of the mid-mounted motor to adapt to off-road scenarios; by improving the rotor end plate structure, the disassembly of the rotor assembly can be facilitated, and the insertion or removal of the magnetic sheet can also be facilitated. The mid-mounted motor also has the advantages of simple structure and light weight; and by improving the rotor assembly and the driving gear, the mid-mounted motor can be assembled quickly and reliably, and the tooth torque can be reduced by reducing the mass of the gear, so that the mid-mounted motor can transmit a larger torque and output a higher power. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent the same elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0060] Figure 1 A structural stereogram of a central motor provided in an embodiment of the utility model;

[0061] Figure 2 A front cross-sectional view of a mid-mounted motor provided in an embodiment of the utility model;

[0062] Figure 3 A front view of a rotor assembly provided by an embodiment of the utility model;

[0063] Figure 4 A structural stereogram of a rotating shaft provided in an embodiment of the utility model;

[0064] Figure 5 A structural stereogram of a rotor core provided in an embodiment of the utility model;

[0065] Figure 6 A front view of a rotor end plate provided in an embodiment of the utility model;

[0066] Figure 7 A structural stereogram of a rotor end plate provided in an embodiment of the utility model;

[0067] Figure 8 A schematic diagram of the structure of the front end cover provided by an embodiment of the utility model;

[0068] Fig. 9 A schematic diagram of the structure of the rear end cover provided by an embodiment of the utility model;

[0069] Fig.10 A structural stereogram of a stator assembly provided in an embodiment of the utility model;

[0070] Fig.11 The embodiment of the utility model provides Figure 4 A local enlarged view at point A;

[0071] Fig.12 A front cross-sectional view of a rotating shaft provided in an embodiment of the utility model, equipped with an induction magnet;

[0072] Fig.13 The embodiment of the utility model provides Fig.12 A local enlarged view at point B;

[0073] Fig.14 The embodiment of the utility model provides Figure 3 The view in the C direction;

[0074] Fig.15 A structural stereogram of a rotor assembly provided in an embodiment of the utility model.

[0075] Figure numerals: 100, mid-mounted motor; 1, housing assembly; 11, housing; 12, front cover; 13, rear cover; 14, rear cover plate; 15, connector; 121, mounting through hole; 122, first convex ring; 131, step hole; 132, second convex ring; 133, mounting groove; 141, first connecting portion; 142, second connecting portion; 1101, first end; 1102, second end; 1201, first end face; 1202, second end face; 1203, first group of connecting holes; 1211, oil seal groove; 1221, first accommodating groove; 1301, second group of connecting holes; 1321, second accommodating groove; 13 31. third receiving groove; 2. sealing assembly; 21. first sealing ring; 22. second sealing ring; 23. third sealing ring; 24. oil seal component; 3. stator assembly; 31. stator core; 32. coil winding; 311. pin hole; 4. rotor assembly; 41. rotating shaft; 42. rotor core; 43. rotor end plate; 44. bearing; 45. sleeve; 46. magnetic sheet; 47. induction magnetic sheet; 411. concave-convex texture; 412. shaft flat position; 413. oil seal position; 414. first groove; 415. exhaust gap; 416. threaded connection portion; 417. boss; 421. first through hole; 422. receiving groove;

[0076] 431, second through hole; 432, second groove; 433, third through hole; 434, exhaust hole;

[0077] 4211, first hole flat position; 4311, second hole flat position; 5, external wiring harness; 6, driving gear; 7, wiring terminal. DETAILED DESCRIPTION

[0078] The present invention is described in detail below in conjunction with specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0079] It should be noted that, unless otherwise clearly specified and limited, the terms "protruding from", "extending circumferentially", "extending into", "radial", "depth", "width", "thickness", etc. used in this specification to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. The terms such as "installation", "fitting", "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; "fixation" can be bolt fixation, snap fixation or glue fixation; the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, the features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features; "multiple" or "several" means two or more; in addition, "and / or" includes any and all combinations of one or more related listed items; for ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0080] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0081] In this embodiment, the specific shape, structure, size, etc. of the "mid-mounted motor and electric motorcycle" are not limited, and those skilled in the art can selectively use any appropriate implementation method according to actual needs.

[0082] Figure 1 A structural stereogram of a mid-mounted motor provided in an embodiment of the utility model. Figure 2 A front cross-sectional view of a mid-mounted motor provided in an embodiment of the utility model.

[0083] See also Figure 1 and Figure 2 The mid-mounted motor 100 includes: a housing assembly 1, a sealing assembly 2, a stator assembly 3 and a rotor assembly 4.

[0084] The sealing component 2 and the shell component 1 cooperate with each other to enclose and form a closed receiving space.

[0085] Specifically, the stator assembly 3 is accommodated in the accommodating space, and includes: a stator core 31; at least a portion of the housing assembly 1 is configured to be interference fit with the stator core 31, and is connected by a fixing pin to limit relative sliding between the stator core 31 and the housing assembly 1.

[0086] In addition, the housing 11 and the stator core 31 are assembled by a thermal assembly process, that is, the housing 11 is heated to expand and then immediately pressed into the stator core 31 , and after the housing 11 cools down, an interference fit can be achieved between the housing 11 and the stator core 31 .

[0087] It can be understood that a pin hole 311 compatible with the fixing pin is opened on the side of the stator core 31; the same pin hole 311 is also opened on the side of the casing 11; the stator core 31 can also be fixed to the casing 11 by a fixing pin to further ensure the reliable connection between the casing 11 and the stator assembly 3.

[0088] Figure 3 A front view of a rotor assembly provided in an embodiment of the utility model. Figure 4 A structural stereogram of a rotating shaft provided in an embodiment of the utility model.

[0089] It should be noted that if Figure 3 and Figure 4 As shown, at least a portion of the rotor assembly 4 is arranged inside the stator core 31, including: a rotor core 42, a pair of rotor end plates 43 and a rotating shaft 41; the pair of rotor end plates 43 are detachably arranged at both ends of the rotor core 42 that are away from each other; the rotating shaft 41 and the rotor core 42 are arranged to be interference fit, and a concave-convex texture 411 is arranged on the surface of the rotating shaft 41 to limit relative sliding between the rotating shaft 41 and the rotor core 42.

[0090] It can be understood that the concave-convex texture 411 provided on the rotating shaft 41 can be knurling; the knurling can accommodate lubricant to form an oil film, thereby reducing the friction of the rotating shaft 41 during the fitting process; compared with a smooth shaft surface, a shaft surface with knurling can provide a larger surface area, increase the lubrication effect, thereby reducing the friction resistance of the shaft, thereby reducing the difficulty of inserting the rotating shaft 41; moreover, the knurling can also disperse stress concentration, reduce the pressure between the rotating shaft 41 and the mating part, thereby reducing the difficulty of inserting the rotating shaft 41; in addition, the knurling can also improve the self-centering property of the rotating shaft 41 (the self-centering property refers to the ability of the shaft to automatically adjust and align to the correct position during the assembly process; if the shaft surface is smooth, it is easy to cause the shaft to be offset or misaligned), which can reduce the difficulty of inserting the rotating shaft 41; therefore, by arranging knurling on the surface of the rotating shaft 41, the difficulty of inserting the rotating shaft 41 can be effectively reduced, thereby improving assembly efficiency and assembly quality.

[0091] Figure 5This is a structural stereogram of a rotor core provided in an embodiment of the utility model. Figure 6 A front view of a rotor end plate provided in an embodiment of the utility model.

[0092] In some embodiments, see Figure 5 and Figure 6 The rotor core 42 is provided with a first through hole 421 adapted to the rotating shaft 41 ; the rotor end plate 43 is provided with a second through hole 431 adapted to the rotating shaft 41 .

[0093] Figure 7 A structural stereogram of a rotor end plate provided in an embodiment of the utility model.

[0094] It should be noted that, combined with Figures 4 to 7 It can be seen that the outer surface of the rotating shaft 41 is provided with at least one shaft flattening position 412, the first through hole 421 is provided with at least one first hole flattening position 4211 adapted to the shaft flattening position 412, and the second through hole 431 is provided with at least one second hole flattening position 4311 adapted to the shaft flattening position 412.

[0095] In addition, the shaft flattened position 412 and the first hole flattened position 4211 cooperate with each other to achieve the positioning and assembly between the rotating shaft 41 and the rotor core 42; the shaft flattened position 412 and the second hole flattened position 4311 cooperate with each other to achieve the positioning and assembly between the rotating shaft 41 and the rotor end plate 43.

[0096] It can be understood that at least one shaft flattening position 412 is provided on the rotating shaft 41; the rotor core 42 and the rotor end plate 43 are both provided with hole flattening positions that are compatible with the shaft flattening position 412, which can simplify the installation and positioning process of the rotating shaft 41, thereby ensuring a reliable connection between the rotating shaft 41 and the rotor core 42 and the rotor end plate 43; wherein, the shaft flattening position 412 refers to a plane cut on the surface of the shaft, and the distance from the plane to the axis is less than the radius of the shaft, and the shaft flattening position 412 and the hole flattening position cooperate with each other to achieve positioning assembly and reliable installation.

[0097] In some embodiments, Figure 1 and Figure 2 As shown, the housing assembly 1 includes: a housing 11 , a front cover 12 , a rear cover 13 and a rear cover plate 14 .

[0098] Figure 8 A schematic structural diagram of a front end cover provided in an embodiment of the utility model. Fig. 9 A schematic structural diagram of a rear end cover provided in an embodiment of the utility model.

[0099] Specific, combined Figure 1 , Figure 2 , Figure 8 and Fig. 9It can be seen that the housing 11 has a first end 1101 and a second end 1102 opposite to each other; the front end cover 12 has a first end face 1201 and a second end face 1202 that are separated from each other; the first end face 1201 is in contact with the first end 1101; the front end cover 12 is provided with a mounting through hole 121 adapted to the rotating shaft 41; the mounting through hole 121 is provided with an oil seal groove 1211 extending in the circumferential direction and close to the second end face 1202;

[0100] It should be noted that one end of the rear end cover 13 is in contact with the second end 1102 , and the other end is connected to the rear cover plate 14 ; the rear end cover 13 is provided with a plurality of step holes 131 .

[0101] Fig.10 A structural stereogram of a stator assembly provided in an embodiment of the utility model.

[0102] It is understandable that if Figure 1 and Fig.10 As shown, the connector 15 that cooperates with the step hole 131 is used to connect the external wiring harness 5, and the external wiring harness 5 is electrically connected to the coil winding 32 of the stator assembly 3. The rear end cover is provided with a plurality of step holes 131;

[0103] Several connectors 15 cooperate with the step holes 131; several connectors 15 are used to connect several external wiring harnesses 5; one end of the external wiring harness 5 is electrically connected to the coil winding 32 of the stator assembly 3, and the other end is connected to an external power supply (not shown in the figure) through the terminal block 7.

[0104] Specifically, the connector 15 can be a waterproof connector with waterproof performance; the step hole 131 cooperates with the waterproof connector to effectively isolate the external space and the internal space of the rear end cover 13, further improve the protection of the mid-mounted motor 100, and can isolate the external pollution source (moisture or dust) entering from the joint between the waterproof connector and the rear end cover 13 in the step hole 131.

[0105] In some embodiments, see Figure 8 and Fig. 9 The front end cover 12 is provided with a first protruding ring 122 protruding from the first end surface 1201; the outer surface of the first protruding ring 122 is provided with a first receiving groove 1221 extending in the circumferential direction.

[0106] The rear end cover 13 is provided with a second convex ring 132 protruding from the end surface of the rear end cover 13 abutting against the second end 1102 ; the outer surface of the second convex ring 132 is provided with a second receiving groove 1321 extending in the circumferential direction.

[0107] In addition, the rear cover plate 14 has a first connection portion 141 and a second connection portion 142; the second connection portion 142 protrudes from the surface of the first connection portion 141; a mounting groove 133 adapted to the second connection portion 142 is provided at one end of the rear end cover 13 away from the second convex ring 132; when the first connection portion 141 abuts against the rear end cover 13, the second connection portion 142 extends into the mounting groove 133; a third accommodating groove 1331 extending circumferentially is provided in the mounting groove 133.

[0108] In some embodiments, see Figure 2 , Figure 8 and Fig. 9 The sealing assembly 2 includes: a first sealing ring 21 , a second sealing ring 22 , a third sealing ring 23 and an oil sealing component 24 .

[0109] Among them, the first sealing ring 21, the second sealing ring 22 and the third sealing ring 23 are all suitable for static sealing conditions, while the oil seal component 24 is suitable for dynamic sealing conditions; wherein, static sealing refers to a seal formed between two relatively stationary components, at which time there is no relative movement between the two components; and dynamic sealing refers to a seal formed between two relatively moving components, at which time there is relative movement between the two components.

[0110] It should be noted that the first sealing ring 21 is accommodated in the first accommodating groove 1221; when the first end face 1201 of the front end cover 12 abuts against the first end 1101 of the casing 11, the first sealing ring 21 abuts against the casing 11 to fill the gap between the outer surface of the first convex ring 122 and the inner surface of the casing 11.

[0111] It can be understood that the second sealing ring 22 is accommodated in the second accommodating groove 1321; when the rear end cover 13 abuts the second end 1102 of the casing 11, the second sealing ring 22 abuts against the casing 11 to fill the gap between the outer surface of the second convex ring 132 and the inner surface of the casing 11.

[0112] In addition, the third sealing ring 23 is accommodated in the third accommodating groove 1331; when the first connecting portion 141 of the rear cover plate 14 abuts against the end of the rear end cover 13 away from the second protruding ring 132, the third sealing ring 23 abuts against the second connecting portion 142 to fill the gap between the surface of the mounting groove 133 and the outer surface of the second connecting portion 142.

[0113] For details, please refer to Figure 2 and Figure 4The oil seal component 24 is accommodated in the oil seal groove 1211; the rotating shaft 41 has an oil seal position 413 corresponding to the oil seal groove 1211; when the rotating shaft 41 passes through the mounting through hole 121, the oil seal component 24 abuts against the rotating shaft 41 at the oil seal position 413 to fill the gap between the surface of the mounting through hole 121 and the outer surface of the rotating shaft 41.

[0114] The oil seal component 24 , the front cover 12 , the first sealing ring 21 , the housing 11 , the second sealing ring 22 , the rear cover 13 , the third sealing ring 23 and the rear cover plate 14 enclose a receiving space.

[0115] In some embodiments, Figure 4 As shown, a threaded connection portion 416 is disposed at one end of the rotating shaft 41 , and the threaded connection portion 416 extends out of the receiving space.

[0116] Fig.11 The embodiment of the utility model provides Figure 4 A partial enlarged view of point A.

[0117] It should be noted that, combined with Figure 4 and Fig.11 It can be seen that the other end of the rotating shaft 41 is provided with a first groove 414 extending axially; a boss 417 is provided in the first groove 414 and protrudes from the bottom surface of the first groove 414; the edge of the first groove 414 is provided with an exhaust notch 415 extending radially, and the exhaust notch 415 is in an arc shape.

[0118] Fig.12 A front cross-sectional view of a rotating shaft provided in an embodiment of the utility model, equipped with an induction magnet. Fig.13 The embodiment of the utility model provides Fig.12 A partial enlarged view at point B. Fig.14 The embodiment of the utility model provides Figure 3 View in the C direction.

[0119] It is understandable that, combined with 4, Fig.12 , Fig.13 and Fig.14 It can be seen that the axial dimension of the boss 417 is smaller than the axial dimension of the first groove 414 (that is, the axial height of the boss 417 is smaller than the axial depth of the first groove 414); there is a preset spacing range Y between the axis of the exhaust notch 415 and the axis of the rotating shaft 41; the exhaust notch 415 has a preset radius range R1.

[0120] Fig.15 A structural stereogram of a rotor assembly provided in an embodiment of the utility model.

[0121] In some embodiments, see Figure 3 , Fig.11 , Fig.14 and Fig.15 The rotor assembly 4 further includes a magnetic sheet 46 and an induction magnetic sheet 47 .

[0122] It should be noted that a plurality of receiving grooves 422 are provided on the end surface of the rotor core 42, and the receiving grooves 422 are used to receive the magnetic pieces 46; high-temperature glue can be used to bond the magnetic pieces 46 and the rotor core 42, and the sleeve 45, the bearing 44 and the rotor end plate 43 cooperate with each other to prevent the magnetic pieces 46 from loosening and flying out.

[0123] For details, please refer to Figure 13 to Figure 15 , the magnetic sheet 46 is detachably connected to the rotor core 42; at least a portion of the induction magnetic sheet 47 is accommodated in the first groove 414, and the induction magnetic sheet 47 is detachably connected to the boss 417; an overflow glue space is formed between the bottom surface of the first groove 414 and the induction magnetic sheet 47; the overflow glue space has a preset width range X1 in the radial direction and a preset depth range T2 in the axial direction.

[0124] It is understandable that the use of non-magnetic conductive material for the rotating shaft 41 can effectively prevent the performance degradation of the induction magnetic sheet 47, thereby solving the defect that the traditional induction magnetic sheet 47 needs to be installed using aluminum screws or other non-magnetic conductive materials.

[0125] The preset spacing range Y is: R0-0.6R1 to R0+0.6R1, wherein R0 is the outer diameter of the induction magnetic sheet 47, and R1 is 1 mm to 2 mm.

[0126] In addition, the preset width range X1 is one quarter to one third of R0 and is not less than 1 mm; the preset depth range T2 is greater than 0.3T1 to limit the floating of the induction magnetic sheet 47, wherein T1 is the axial dimension of the induction magnetic sheet 47 (ie, the thickness dimension of the induction magnetic sheet).

[0127] In some embodiments, see Figure 6 , Fig.14 and Fig.15 A second groove 432 and a third through hole 433 arranged in the circumferential direction are opened on the edge of the rotor end plate 43 .

[0128] It should be noted that the radial dimension of the second groove 432 has a preset length range; the preset length range is: 0.5R2 to 0.6R2, wherein R2 is the outer diameter dimension of the rotor end plate 43 .

[0129] It can be understood that the third through hole 433 is a waist-shaped hole with a preset diameter range; the preset diameter range is: 1.7R1 to 1.9R1, so as to limit the movement of the magnetic sheet 46 so that the magnetic sheet 46 is exposed.

[0130] Specifically, the rotor end plate 43 may also include a plurality of exhaust holes 434 and balancing grooves; the exhaust holes 434 facilitate heat dissipation of the rotor core 42, and the balancing grooves are used to stick balancing mud; the magnetic sheet 46 may expose the third through hole 433 of the rotor end plate 43, so that the rotor end plate 43 can not only effectively press the magnetic sheet 46, but also enable the magnetic sheet 46 to be ejected and repaired when it is assembled and inserted in reverse.

[0131] In addition, if Figure 3 As shown, the rotor assembly 4 also includes: two sleeves 45 and two bearings 44; the two bearings 44 are sleeved on the rotating shaft 41 away from each other and are both far away from the two ends of the rotor core 42; one end of the sleeve 45 abuts against the rotor end plate 43, and the other end abuts against the rotor core 42 to limit the axial movement of the rotor end plate 43.

[0132] See also Figure 1 and Figure 2 The electric motorcycle based on the mid-mounted motor 100 (not shown in the figure) comprises: an electric motorcycle body (not shown in the figure), the above-mentioned mid-mounted motor 100 and a transmission device (not shown in the figure); the electric motorcycle body comprises an electric motorcycle frame (not shown in the figure) and a motion carrier (not shown in the figure);

[0133] Among them, the central motor 100 is accommodated in the electric motorcycle frame and drives the motion carrier through a transmission device; the transmission device includes a driving gear 6; the driving gear 6 is detachably connected to the rotating shaft 41 of the central motor 100, and is located at one end of the rotating shaft 41 close to the threaded connection part 416.

[0134] The driving gear 6 is provided with a plurality of third grooves; the driving gear 6 has an inner hole and an outer ring, the inner hole is cylindrical, and the outer ring is elliptical.

[0135] In the embodiment of the present application, a first group of connecting holes 1203 is further provided on the second end 1102 of the front end cover 12; the first group of connecting holes 1203 has two holes in total, and the distance between the two holes is 170±0.5mm; and a second group of connecting holes 1301 is also provided on the end of the rear end cover 13 away from the second convex ring 132; the second group of connecting holes 1301 has two holes in total, and the distance between the two holes is also 170±0.5mm; in addition, the distance between the first group of connecting holes 1203 and the second group of connecting holes 1301 is 142.5±0.5mm.

[0136] It can be understood that the outer diameter of the first groove 414 is comparable to the outer diameter of the induction magnetic sheet 47 .

[0137] It should be noted that the driving gear 6 is provided with a plurality of third grooves, which can reduce the weight of the driving gear 6, thereby reducing the cogging torque of the driving gear 6 (since the weight of the driving gear 6 will directly affect the inertia moment and rotational inertia of the driving gear 6, therefore, when the weight of the driving gear 6 is reduced, its inertia moment and rotational inertia will also decrease, resulting in a corresponding reduction in the cogging torque of the driving gear 6), so as to reduce the inertia load of the transmission system and improve the transmission efficiency; moreover, reducing the weight of the driving gear 6 can also reduce the influence of centrifugal force and inertia force on the driving gear 6, thereby improving the reliability and stability during the transmission process.

[0138] In addition, the motion carrier may be a tire of an electric motorcycle.

[0139] In summary, the mid-mounted motor and electric motorcycle provided by the embodiment of the utility model, by adding a sealing component, can achieve better sealing between the front cover and the housing, between the rear cover and the housing, between the rear cover plate and the front cover plate, and between the rotating shaft and the front cover; by the step hole and the connector cooperating with each other, the external wiring harness and the rear cover can have better sealing, thereby improving the protection of the mid-mounted motor to adapt to off-road scenes; by improving the rotor end plate structure, it can facilitate the disassembly of the rotor assembly and the insertion or removal of the magnetic sheet, and the mid-mounted motor also has the advantages of simple structure and light weight; and by improving the rotor assembly and the driving gear, the mid-mounted motor can be assembled quickly and reliably, and the tooth torque can be reduced by reducing the mass of the gear, so that the mid-mounted motor can transmit a larger torque and output a higher power. Therefore, the mid-mounted motor provided by the embodiment of the utility model has a certain novelty compared with the traditional mid-mounted motor.

[0140] The above contents are further detailed descriptions of the present invention in combination with specific / preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A mid-mounted motor, characterized in that: include: A shell assembly and a sealing assembly; the sealing assembly cooperates with the shell assembly to enclose and form a closed receiving space; A stator assembly accommodated in the accommodation space; the stator assembly comprises: a stator core; at least a portion of the housing assembly is configured to be interference fit with the stator core, and is connected by a fixing pin to limit relative sliding between the stator core and the housing assembly; A rotor assembly at least part of which is arranged inside the stator core; the rotor assembly includes: a rotor core, a pair of rotor end plates and a rotating shaft; the pair of rotor end plates are detachably arranged at two ends of the rotor core that are away from each other; an interference fit is arranged between the rotating shaft and the rotor core, and a concave-convex texture is arranged on the surface of the rotating shaft to limit relative sliding between the rotating shaft and the rotor core.

2. The mid-mounted motor according to claim 1, characterized in that: The rotor core is provided with a first through hole adapted to the rotating shaft; the rotor end plate is provided with a second through hole adapted to the rotating shaft; The outer surface of the rotating shaft is provided with at least one shaft flattened position, the first through hole is provided with at least one first hole flattened position adapted to the shaft flattened position, and the second through hole is provided with at least one second hole flattened position adapted to the shaft flattened position; Among them, the shaft flattening position and the first hole flattening position cooperate with each other to achieve the positioning and assembly between the rotating shaft and the rotor core; the shaft flattening position and the second hole flattening position cooperate with each other to achieve the positioning and assembly between the rotating shaft and the rotor end plate.

3. The mid-mounted motor according to claim 1, characterized in that: The housing assembly comprises: A housing; the housing having a first end and a second end opposite to each other; A front end cover; the front end cover has a first end face and a second end face which are opposite to each other; the first end face is in contact with the first end; a mounting through hole which is adapted to the rotating shaft is provided on the front end cover; an oil seal groove which extends in a circumferential direction and is close to the second end face is provided in the mounting through hole; A rear end cover; one end of the rear end cover is in contact with the second end, and the other end is connected to the rear cover plate; the rear end cover is provided with a plurality of step holes; A plurality of connectors cooperate with the step holes; the plurality of connectors are used to connect a plurality of external wiring harnesses; the external wiring harnesses are electrically connected to the coil windings of the stator assembly.

4. The mid-mounted motor according to claim 3, characterized in that: The front end cover is provided with a first convex ring protruding from the first end surface; the outer surface of the first convex ring is provided with a first receiving groove extending in the circumferential direction; Wherein, the rear end cover is provided with a second convex ring protruding from the end surface of the rear end cover abutting against the second end; the outer surface of the second convex ring is provided with a second receiving groove extending in the circumferential direction; Among them, the rear cover plate has a first connecting part and a second connecting part; the second connecting part protrudes from the surface of the first connecting part; an installation groove adapted to the second connecting part is provided at one end of the rear end cover away from the second protruding ring; when the first connecting part abuts against the rear end cover, the second connecting part extends into the installation groove; a third accommodating groove extending circumferentially is provided in the installation groove.

5. The mid-mounted motor according to claim 4, characterized in that: The sealing assembly comprises: a first sealing ring received in the first receiving groove; when the first end surface of the front end cover abuts against the first end of the housing, the first sealing ring abuts against the housing to fill the gap between the outer surface of the first convex ring and the inner surface of the housing; a second sealing ring received in the second receiving groove; when the rear end cover abuts against the second end of the housing, the second sealing ring abuts against the housing to fill the gap between the outer surface of the second convex ring and the inner surface of the housing; A third sealing ring is accommodated in the third accommodating groove; when the first connecting portion of the rear cover plate abuts against the end of the rear end cover away from the second protruding ring, the third sealing ring abuts against the second connecting portion to fill the gap between the surface of the mounting groove and the outer surface of the second connecting portion.

6. The mid-mounted motor according to claim 5, characterized in that: The sealing assembly further comprises: an oil seal component received in the oil seal groove; The rotating shaft has an oil seal position corresponding to the oil seal groove; when the rotating shaft passes through the mounting through hole, the oil seal component abuts against the rotating shaft at the oil seal position to fill the gap between the surface of the mounting through hole and the outer surface of the rotating shaft; The oil seal component, the front end cover, the first sealing ring, the housing, the second sealing ring, the rear end cover, the third sealing ring and the rear cover plate together form the receiving space.

7. The mid-mounted motor according to claim 6, characterized in that: A threaded connection portion is disposed at one end of the rotating shaft, and the threaded connection portion extends out of the receiving space; The other end of the rotating shaft is provided with a first groove extending in the axial direction; a boss is provided in the first groove, protruding from the bottom surface of the first groove; an exhaust notch extending in the radial direction is provided at the edge of the first groove, and the exhaust notch is in the shape of an arc; Among them, the axial dimension of the boss is smaller than the axial dimension of the first groove; there is a preset spacing range between the axis of the exhaust notch and the axis of the rotating shaft; and the exhaust notch has a preset radius range.

8. The mid-mounted motor according to claim 7, characterized in that: The rotor assembly comprises: A magnetic sheet; the magnetic sheet is detachably connected to the rotor core; An induction magnetic sheet; at least a portion of the induction magnetic sheet is accommodated in the first groove, and the induction magnetic sheet is detachably connected to the boss; a glue overflow space is formed between the bottom surface of the first groove and the induction magnetic sheet; the glue overflow space has a preset width range in the radial direction and a preset depth range in the axial direction; The preset spacing range is: R0-0.6R1 to R0+0.6R1, wherein R0 is the outer diameter of the induction magnetic sheet, and R1 is the preset radius range of the exhaust gap, which is 1 mm to 2 mm; The preset width range is from one quarter of R0 to one third of R0, and is not less than 1 mm; the preset depth range is greater than 0.3T1 to limit the floating of the induction magnetic sheet, wherein T1 is the axial dimension of the induction magnetic sheet.

9. The mid-mounted motor according to claim 8, characterized in that: A second groove and a third through hole arranged in the circumferential direction are provided on the edge of the rotor end plate; The radial dimension of the second groove has a preset length range; the preset length range is: 0.5R2 to 0.6R2, wherein R2 is the outer diameter dimension of the rotor end plate; Wherein, the third through hole is a waist-shaped hole having a preset diameter range; the preset diameter range is: 1.7R1 to 1.9R1, so as to limit the movement of the magnetic sheet so that the magnetic sheet is exposed; Wherein, the rotor assembly also includes: two sleeves and two bearings; the two bearings are sleeved on the rotating shaft with their backs to each other and are both far away from the two ends of the rotor core; one end of the sleeve abuts against the rotor end plate, and the other end abuts against the rotor core to limit the axial movement of the rotor end plate.

10. An electric motorcycle, characterized in that: include: An electric scooter body, a mid-mounted motor and a transmission device as claimed in any one of claims 1 to 9; the electric scooter body comprises an electric scooter frame and a motion carrier; The central motor is contained in the electric motorcycle frame and drives the motion carrier through the transmission device; the transmission device includes a driving gear; the driving gear is detachably connected to the rotating shaft of the central motor and is located at one end of the rotating shaft close to the threaded connection part; Wherein, the driving gear is provided with a plurality of third grooves; the driving gear has an inner hole and an outer ring, the inner hole is cylindrical, and the outer ring is elliptical.

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