An electric vehicle hub motor and a vehicle frame

Abstract

The present invention discloses an electric vehicle hub motor and a frame, which relates to the field of hub motors and includes an electric vehicle frame in a V shape with an opening facing downward and a hub motor installed at the bottom of the electric vehicle frame; the hub motor includes a motor shaft and a motor housing; the motor housing is rotatably arranged on the motor shaft; the motor shaft includes a hollow shaft and a spline shaft; the hollow shaft is sleeved on the spline shaft and an axially penetrating keyway matched with the spline shaft is formed on the inner cylindrical surface of the hollow shaft; the length of the spline shaft is greater than that of the hollow shaft and both ends of the spline shaft are detachably fixed on the electric vehicle frame. The present invention has the effect of facilitating the installation of the hub motor.

Description

Technical Field

[0001] The present invention relates to the field of hub motors, and in particular, to an electric vehicle hub motor and a vehicle frame. Background Art

[0002] At present, the battery installed on the vehicle frame supplies power to the motor of a two-wheel electric vehicle, and the rotation of the motor drives the bicycle forward. Generally, the motor is arranged in the front hub or the rear hub, so this motor is also called a hub motor.

[0003] The two ends of the main shaft of the existing hub motor are respectively formed into flat shapes, and a shaft hole is formed at one end. The motor wire for supplying power to the motor is led out from the shaft hole of the main shaft. At the same time, slots are formed at both ends of the bottom of the vehicle frame to cooperate with the two ends of the main shaft of the hub motor. During installation, the two ends of the main shaft of the hub motor are respectively inserted into the slots at both ends of the vehicle frame, and then a rotation prevention limiting piece is sleeved from the outside to the inside. The other end of the rotation prevention limiting piece is sleeved on the position-limiting pin formed on the vehicle frame, and finally a nut is screwed on to complete the installation.

[0004] In view of the above related technologies, the inventor believes that there are the following defects: In order to prevent the main shaft of the hub motor from rotating, it is necessary to additionally assemble a rotation prevention limiting piece, which not only increases the cost, but also adds a process during installation, making the installation inconvenient. Summary of the Invention

[0005] In order to solve the technical problem of inconvenient installation of the hub motor, the present invention provides an electric vehicle hub motor and a vehicle frame.

[0006] The electric vehicle hub motor and vehicle frame provided by the present invention adopt the following technical solutions:

[0007] An electric vehicle hub motor and vehicle frame, including an electric vehicle frame in a V shape with an opening facing downwards and a hub motor installed at the bottom of the electric vehicle frame; the hub motor includes a motor shaft and a motor housing; the motor housing is rotatably arranged on the motor shaft; the motor shaft includes a hollow shaft and a spline shaft; the hollow shaft is sleeved on the spline shaft, and an axially penetrating keyway is formed on the inner cylindrical surface of the hollow shaft to cooperate with the spline shaft; the length of the spline shaft is greater than the length of the hollow shaft, and both ends of the spline shaft are detachably fixed on the electric vehicle frame.

[0008] By adopting the above technical solutions, both ends of the hollow shaft are used to support the motor housing; both ends of the spline shaft are detachably connected to the electric vehicle frame, and there is no need for rotation prevention parts such as rotation prevention limiting pieces, which is convenient for installation; at the same time, the rotation prevention effect of the spline rotation prevention method is better and the strength is higher than that of the rotation prevention limiting piece rotation prevention method.

[0009] Optionally, spline holes for the spline shaft to pass through are respectively formed at both ends of the bottom of the electric vehicle frame; both ends of the spline shaft are respectively inserted into the spline holes on the corresponding side; coaxial connection threaded holes are respectively formed at both ends of the spline shaft; connection bolts are screwed into the connection threaded holes; the diameter of the head of the connection bolt is larger than the diameter of the spline hole.

[0010] By adopting the above technical solution, during installation, the spline shaft passes through the spline hole on one side of the electric vehicle frame, the hollow shaft and the spline hole on the other side in sequence, thus playing an anti-rotation role.

[0011] Optionally, U-shaped groove-shaped connection slots with openings facing downwards and cooperating with both ends of the hollow shaft are respectively formed on the end faces of both ends of the bottom of the electric vehicle frame close to each other.

[0012] By adopting the above technical solution, before installing the spline shaft, both ends of the hollow shaft can be inserted into a pair of connection slots, thus supporting the entire motor housing and facilitating the subsequent insertion of the hollow shaft.

[0013] Optionally, a clutch is arranged inside the motor housing; splines are formed on the outer cylindrical surface of the hollow shaft; the clutch is connected to the motor shaft through the splines.

[0014] By adopting the above technical solution, the splines are used to connect the clutch instead of key pins, solving the problem that key pins cannot be installed due to the relatively thin wall thickness of the hollow shaft.

[0015] Optionally, it further includes a connector; a circular connection terminal is sleeved and fixed at one end of the hollow shaft; the connection terminal axially passes through the motor housing; power is supplied to the hub motor through the connection terminal; one end of the connector is provided with a female connector end and the other end is provided with a male connector end; the female connector end is circular and sleeved on the hollow shaft; the female connector end is plugged on the outer side end of the connection terminal; an external connection female end is arranged on the electric vehicle frame; the external connection female end is plugged on the male connector end; the electric connection between the electric vehicle battery and the hub motor is realized through the connector and the external connection female end.

[0016] By adopting the above technical solution, power is supplied to the hub motor through the external connection female end, the connector and the connection terminal, so there is no existence of motor wires, which has no impact on the use process. At the same time, the connection terminal is circular and sleeved on the motor shaft, and the female connector end of the connector is circular and sleeved on the motor shaft. In this way, when the power of the hub motor needs to be increased, only the components inside the connection terminal and the connection components need to be changed, and it will not be restricted by the motor shaft, and large current can be achieved.

[0017] Optionally, the connection terminal includes three sets of phase terminal groups; each phase terminal group consists of a pair of phase pins; the rotation central axes of the six phase pins are on the same cylindrical surface and the cylindrical surface is coaxially arranged with the connection terminal.

[0018] By adopting the above technical solution, the number of pins corresponding to the phase wires changes from one to a pair, which greatly reduces the required diameter and maximizes the motor power change in a limited space.

[0019] Optionally, the connection terminal further includes a plurality of signal pins and an annular motor PCB board; the hub motor includes a stator; the motor PCB board is connected to the stator through a wire; the inner ends of the signal pins and the phase pins are connected to the motor PCB board.

[0020] By adopting the above technical solution, the use of the motor PCB board greatly reduces the wires inside the motor housing, making the layout of the motor housing more reasonable.

[0021] Optionally, an outer slot in the shape of an annular groove for cooperating with the female end of the connector is formed on the outer end face of the connection terminal; a plurality of axially penetrating terminal through holes evenly distributed in the circumferential direction are formed on the inner side wall of the outer slot; a plurality of protrusions for cooperating with the terminal through holes are formed on one end of the female end of the connector close to the connection terminal; the protrusions are inserted into the corresponding terminal through holes.

[0022] By adopting the above technical solution, when the connector is connected, one end of the female end of the connector close to the connection terminal is inserted into the outer slot, and the protrusions are inserted into the terminal through holes of the corresponding connection terminal on the corresponding side. In this way, the connector is not easily detached during use and the accuracy of the pin insertion is ensured.

[0023] Optionally, a plurality of axially evenly distributed annular outer sealing rings are respectively arranged on the outer cylindrical surface of the female end of the connector; the outer sealing rings cooperate with the outer cylindrical surface of the outer slot.

[0024] By adopting the above technical solution, the presence of the sealing rings on the outer cylindrical surface of the female end of the connector improves the sealing performance of the hub motor.

[0025] Optionally, a plurality of axially evenly distributed inner sealing rings are formed on the inner cylindrical surface of the connector that cooperates with the hollow shaft.

[0026] By adopting the above technical solution, the inner sealing rings are used to improve the sealing performance between the connector and the hollow shaft.

[0027] In summary, the beneficial effects of the present invention are as follows:

[0028] 1. There is no need for anti-rotation limiting parts such as anti-rotation limiting sheets, which is convenient for installation.

[0029] 2. It is not restricted by the motor shaft and can achieve the passage of large current, thereby increasing the power of the hub motor. Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the present invention.

[0031] Figure 2 It is a schematic structural diagram of the electric vehicle frame 10 of the present invention.

[0032] Figure 3 It is a schematic structural diagram of the hub motor 30 and the connector 20 of the present invention.

[0033] Figure 4 It is a schematic sectional structural diagram of the hub motor 30 and the connector 20 of the present invention.

[0034] Figure 5 It is a schematic structural diagram of the motor shaft 31 and a pair of connecting bolts 40 of the present invention.

[0035] Figure 6 It is an exploded schematic structural diagram of the external connection female end 11, the connector 20 and the hub motor 30 of the present invention.

[0036] Figure 7 It is a schematic structural diagram of the connection terminal 32 of the present invention.

[0037] Figure 8 It is a schematic structural diagram of the connector 20 of the present invention.

[0038] Figure 9 It is a schematic structural diagram of the connector 20 with the protective housing 22 removed of the present invention.

[0039] Description of the Reference Numerals:

[0040] 10, electric vehicle frame; 101, connection slot; 102, spline hole; 11, external connection female end;

[0041] 20, connector; 21, connector female end; 22, protective housing; 23, connector male end; 24, sealing ring; 25, connection PCB board;

[0042] 30. Hub motor; 31. Motor shaft; 311. Hollow shaft; 3111. Spline; 312. Spline shaft; 3120. Connecting threaded hole; 32. Connecting terminal; 320. Terminal perforation; 321. Terminal base; 3211. Inner support ring; 3212. Support connecting seat; 3213. Outer support ring; 322. Insulating seat; 323. Phase pin; 324. Signal pin; 325. Motor PCB board; 33. Stator; 34. Rotor; 35. Sun gear; 36. Planetary reduction gear set; 37. Outer gear ring; 38. Clutch; 39. Motor housing; 391. End cover; 392. Cover shell;

[0043] 40. Connecting bolt. Detailed implementation manner

[0044] The following will further describe the present invention in detail with reference to the Figures 1-9 accompanying drawings.

[0045] This application discloses an electric vehicle hub motor and a frame, referring to Figure 1 , which includes an electric vehicle frame 10, a connector 20 and a hub motor 30; the hub motor 30 includes a motor shaft 31 and a motor housing 39; the motor housing 39 is rotatably arranged on the motor shaft 31; the motor shaft 31 is detachably fixed to the electric vehicle frame 10; an external connection female end 11 is arranged on the electric vehicle frame 10; the connector 20 is sleeved on the motor shaft 31 and is connected to the external connection female end 11 at one end and to the hub motor 30 at the other end; in this way, the hub motor 30 is installed on the electric vehicle frame 10 through the motor shaft 31; one end of the connector 20 is connected to the external connection female end 11 and the other end is sleeved on the motor shaft 31 and connected to the hub motor 30, so as to realize the electrical connection of the hub motor 30; since the power supply to the hub motor is not through the motor wire inside the motor shaft 31, but through the connector 20 outside the motor shaft 31, the thickening of the wire involved in increasing the power of the hub motor will not be affected by the motor shaft 31.

[0046] Referring to Figures 1-5, in order to overcome the problem of inconvenient installation caused by adding the anti-rotation limiting piece, the motor shaft 31 includes a hollow shaft 311 and a spline shaft 312; the hollow shaft 311 is sleeved on the spline shaft 312 and an axially penetrating keyway for mating with the spline shaft 312 is formed on the inner cylindrical surface of the hollow shaft 311; the length of the spline shaft 312 is greater than the length of the hollow shaft 311 and both ends of the spline shaft 312; the electric vehicle frame 10 is in a V shape with the opening facing downwards; spline holes 102 for the spline shaft 312 to pass through are respectively formed at both ends of the bottom of the electric vehicle frame 10, and connecting slots 101 in the shape of U-shaped grooves facing downwards and mating with both ends of the hollow shaft 311 are respectively formed on the end faces close to each other; connecting threaded holes 3120 are coaxially formed at both ends of the spline shaft 312; connecting bolts 40 are screwed into the connecting threaded holes 3120; the diameter of the head of the connecting bolt 40 is greater than the diameter of the spline hole 102; thus, during installation, only both ends of the hollow shaft 311 need to be inserted into a pair of connecting slots 101 respectively, then the hollow shaft 311 passes through the spline hole 102 on one side, the hollow shaft 311 and the spline hole 102 on the other side in sequence, and then the connecting bolts 40 are screwed into the connecting threaded holes 3120 on both sides, so that the installation is convenient.

[0047] Refer to Figure 2 , a circular connecting terminal 32 is sleeved on one end of the hollow shaft 311 and they are in interference fit, and a spline 3111 is formed on the other end; the motor housing 39 includes an end cover 391 and a housing 392; the end cover 391 is rotatably connected to the outer cylindrical surface of the connecting terminal 32 through a bearing, and an oil seal is provided between the end cover 391 and the connecting terminal 32; one end of the housing 392 close to the end cover 391 is integrally connected by bolts, the end far from the end cover 391 is rotatably connected to the hollow shaft 311 through a bearing, and an oil seal is provided between the housing 392 and the hollow shaft 311; by sleeving the connector 20 on the motor shaft 31 and connecting it to the connecting terminal 32 outside the motor shaft 31 to achieve electrical connection, the diameter of the wire used for electrical connection will not be restricted by the motor shaft 31 and can meet the passing of large current.

[0048] Refer to Figure 4 , a stator 33 is fixed on the hollow shaft 311, and a rotor 34 is rotatably connected through a bearing; the stator 33 is located between the rotor 34 and the connecting terminal 32; a sun gear 35 is fixed to the end face of the rotor 34 far from the stator 33 by three screws; an external gear ring 37 is fixed to the inner side wall of the housing 392; a planetary reduction gear set 36 is provided between the external gear ring 37 and the sun gear 35; a clutch 38 is provided on the side of the planetary reduction gear set 36 far from the rotor 34; the clutch 38 is connected to the hollow shaft 311 through the spline 3111; wherein the clutch 38 is an overrunning clutch.

[0049] When the hollow shaft 311 is connected to the corresponding components, there is no need to use snap rings and key pins, which greatly reduces the processing procedures of the hollow shaft 311. At the same time, the outer diameter of the hollow shaft 311 can be maximized, greatly increasing the strength.

[0050] Referring to Figures 6-9 , the connection terminal 32 includes a terminal base 321, an annular insulating seat 322, three sets of phase terminal groups, a plurality of signal pins 324, and an annular motor PCB board 325; the terminal base 321 includes an inner support ring 3211 in the shape of a circular cylindrical column and an outer support ring 3213 in the shape of a circular cylindrical column; the inner support ring 3211 and the outer support ring 3213 are coaxially arranged, and a plurality of support connection seats 3212 are formed between the inner ends of the two; the gap between the outer ends of the inner support ring 3211 and the outer support ring 3213 forms an outer slot; a plurality of terminal through holes 320 are formed among the outer support ring 3213, the support connection seat 3212, and the inner support ring 3211; a plurality of insertion parts matching the terminal through holes 320 are formed at one end of the insulating seat 322 close to the terminal base 321; the insertion parts are inserted into the terminal through holes 320; the motor PCB board 325 is fixed to the inner end of the terminal base 321; the phase terminal group includes a pair of phase pins 323; the phase pins 323 and the signal pins 324 pass through the insertion parts of the insulating seat 322 and are parallel to the axis of the insulating seat 322; the phase pins 323 and the signal pins 324 are on the same cylindrical surface, and this cylindrical surface is coaxially arranged with the insulating seat 322; the inner ends of the phase pins 323 and the signal pins 324 are welded to the motor PCB board 325; the motor PCB board 325 is connected to the stator 33 through wires.

[0051] The motor PCB board 325 is located outside the hollow shaft 311, so that the terminal distribution can be carried out without being restricted by the motor shaft. At the same time, one phase terminal is divided into a pair of phase pins 323, and in a limited space, a thicker phase terminal can be corresponded to, meeting the requirement of passing a larger current.

[0052] Referring to Figure 8 and Figure 9, the connector 20 includes a female connector end 21, a wire connection part, and a male connector end 23; the female connector end 21 is annular and sleeved on the hollow shaft 311; several protrusions cooperating with the terminal through-holes 320 are formed at one end of the female connector end 21 close to the connection terminal 32; the protrusions are inserted into the corresponding terminal through-holes 320; in this way, through the insertion fit between the female connector end 21 and the outer slot, and the insertion fit between the protrusions and the terminal through-holes 320, the installation position of the connector 20 is stable, ensuring that the connector 20 is not easily detached during use; several conductive sockets cooperating with the phase pins 323 and signal pins 324 are provided on the female connector end 21, and several conductive pins cooperating with the outer connection female end 11 are provided on the male connector end 23; when the connector 20 is installed in place, the conductive sockets are respectively connected to the phase pins 323 and signal pins 324; when the connector 20 is connected to the outer connection female end 11 in place, the conductive pins are inserted into the outer connection female end 11; the wire connection part includes a connection PCB board 25; an avoidance round hole for the hollow shaft 311 to pass through is formed at one end of the connection PCB board 25 close to the female connector end 21; the conductive pins and conductive sockets are connected through the connection PCB board 25; the electrical connection between the conductive pins and conductive sockets is realized through the connection PCB board 25; a protective housing 22 is injection-molded on the outside of the connection PCB board 25, the end of the female connector end 21 close to the connection PCB board 25, and the end of the male connector end 23 close to the connection PCB board 25; the protective housing 22 is used to protect the connection PCB board 25, the conductive pins, and the conductive sockets.

[0053] Refer to Figure 8 and Figure 9 , a plurality of annular outer sealing rings 24 are respectively arranged on the outer cylindrical surface of the female connector end 21 at uniformly distributed axially; a plurality of inner sealing rings are formed on the inner cylindrical surface of the protective housing 22 that fits with the hollow shaft 311 at uniformly distributed axially; through the cooperation between the outer sealing rings 24 and the outer support ring 3213, the cooperation between the inner sealing rings and the hollow shaft 311, and combined with the two oil seals of the motor housing 39 with the hollow shaft 311 and the connection terminal 32, the sealing effect of the hub motor 30 is greatly increased.

[0054] The working principle of an electric vehicle hub motor and a vehicle frame of the present application is as follows:

[0055] During installation, both ends of the hollow shaft 311 are respectively inserted into a pair of connection slots 101 of the electric vehicle frame 10, and then the spline shaft 312 sequentially passes through the spline hole 102 at one end of the electric vehicle frame 10, the hollow shaft 311, and the spline hole 102 at the other end of the electric vehicle frame 10. Then, a pair of connection bolts 40 are respectively screwed into the connection threaded holes 3120 at both ends of the spline shaft 312 and the heads abut against the electric vehicle frame 10; in this way, there is no need for anti-rotation limit parts such as anti-rotation limit pieces, which is convenient for installation;

[0056] During disassembly, only a pair of connecting bolts 40 need to be unscrewed, and then the spline shaft 312 is pulled out, so that the hub motor and the connector 20 can be removed as a whole, which is convenient for disassembly;

[0057] During operation, the female connector end 21 of the connector 20 is sleeved on the hollow shaft 311 and inserted with the connection terminal 32, and the male connector end 23 is inserted with the external female connection end 11; a storage battery (not shown) supplies power to the hub motor 30 through the external female connection end 11, the connector 20 and the connection terminal 32 to drive the rotation of the motor housing 39, that is, the hub rotates for work; at this time, since no lead wire is provided inside the motor shaft 31, there is no any influence during use; at the same time, since the guiding element is arranged outside the hollow shaft 311, the increase in the power of the hub motor will not be restricted by the motor shaft.

[0058] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. An electric vehicle hub motor and frame, comprising an electric vehicle frame (10) in a V shape with an opening facing downwards and a hub motor (30) installed at the bottom of the electric vehicle frame (10); the hub motor (30) includes a motor shaft (31) and a motor housing (39); the motor housing (39) is rotatably arranged on the motor shaft (31); characterized in that: The motor shaft (31) includes a hollow shaft (311) and a spline shaft (312); the hollow shaft (311) is sleeved on the spline shaft (312), and an axially penetrating keyway that mates with the spline shaft (312) is formed on the inner cylindrical surface of the hollow shaft (311); the length of the spline shaft (312) is greater than the length of the hollow shaft (311), and both ends of the spline shaft (312) are detachably fixed to the electric vehicle frame (10). Spline holes (102) for the spline shaft (312) to pass through are respectively formed at both ends of the bottom of the electric vehicle frame (10); both ends of the spline shaft (312) are respectively inserted into the spline holes (102) on the corresponding side; connection threaded holes (3120) that are coaxially arranged are respectively formed at both ends of the spline shaft (312); connection bolts (40) are screwed into the connection threaded holes (3120); the diameter of the head of the connection bolt (40) is greater than the diameter of the spline hole (102).

2. The electric vehicle hub motor and frame according to claim 1, characterized in that: U-shaped connection slots (101) with openings facing downwards and mating with both ends of the hollow shaft (311) are respectively formed on the end faces of both ends of the bottom of the electric vehicle frame (10) that are close to each other.

3. The electric vehicle hub motor and frame according to claim 1, characterized in that: A clutch (38) is arranged inside the motor housing (39); a spline (3111) is formed on the outer cylindrical surface of the hollow shaft (311); the clutch (38) is connected to the motor shaft (31) through the spline (3111).

4. The electric vehicle hub motor and frame according to claim 1, characterized in that: It further includes a connector (20); a circular connection terminal (32) is sleeved and fixed at one end of the hollow shaft (311); the connection terminal (32) axially penetrates the motor housing (39); power is supplied to the hub motor (30) through the connection terminal (32); one end of the connector (20) is provided with a female connector end (21), and the other end is provided with a male connector end (23); the female connector end (21) is circular and sleeved on the hollow shaft (311); the female connector end (21) is inserted on the outer side end of the connection terminal (32); an external connection female end (11) is arranged on the electric vehicle frame (10); the external connection female end (11) is inserted on the male connector end (23); electrical connection between the electric vehicle battery and the hub motor (30) is achieved through the connector (20) and the external connection female end (11).

5. The electric vehicle hub motor and frame according to claim 4, characterized in that: The connection terminal (32) includes three phase terminal groups; each phase terminal group consists of a pair of phase pins (323); the rotation central axes of the six phase pins (323) are on the same cylindrical surface, and the cylindrical surface is coaxially arranged with the connection terminal (32).

6. The electric vehicle hub motor and frame according to claim 5, characterized in that: The connection terminal (32) further includes a plurality of signal pins (324) and an annular motor PCB board (325); the in-wheel motor (30) includes a stator (33); the motor PCB board (325) is connected to the stator (33) through an electric wire; the inner ends of the signal pins (324) and the phase pins (323) are connected to the motor PCB board (325); the rotation central axes of the signal pins (324) and the phase pins (323) are on the same cylindrical surface.

7. The hub motor and frame of an electric vehicle according to claim 4, characterized in that: An outer slot in the shape of an annular groove that mates with the female connector (21) is formed on the outer end face of the connection terminal (32); a plurality of axially penetrating terminal through-holes (320) that are evenly distributed in the circumferential direction are formed on the inner side wall of the outer slot; a plurality of protrusions that mate with the terminal through-holes (320) are formed on one end of the female connector (21) close to the connection terminal (32); the protrusions are inserted into the corresponding terminal through-holes (320).

8. A hub motor and a frame for an electric vehicle according to claim 7, characterized in that: A plurality of annular outer sealing rings (24) that are evenly distributed in the axial direction are respectively arranged on the outer cylindrical surface of the female connector (21); the outer sealing rings (24) are matched with the outer cylindrical surface of the outer slot.

9. A hub motor and a frame of an electric vehicle according to claim 4 or 8, characterized in that: A plurality of inner sealing rings that are evenly distributed in the axial direction are formed on the inner cylindrical surface of the connector (20) that mates with the hollow shaft (311).

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