Middle motor of electric vehicle

Abstract

The utility model relates to a built-in motor of an electric vehicle, and relates to the technical field of electric vehicles, the built-in motor comprises a motor shell, a gear box is fixedly installed on the end face of the motor shell, a shell is integrally fixed on the inner side of the gear box, the shell is located on the radial side of the motor shell, and the gear box and the shell are jointly and rotationally connected with an output shaft; an output wheel is fixed to the output shaft and located on the radial side of the motor shell. A plurality of transmission gears are rotationally installed in the gearbox, the adjacent transmission gears are connected in a meshed mode, and the motor rotating shaft and the output shaft are fixed to the two transmission gears at the two ends of the gearbox respectively. The middle motor shields and protects the two sides of the motor shell through the left protective plate and the right protective plate, and the output shaft and the output wheel of the middle motor are both arranged on the radial side of the motor shell in an offset mode, so that space occupation in the width direction of a frame is avoided, the thickness of a gear box is minimized, the structure is more compact, and the service life of the middle motor is prolonged. And the output wheel is not easy to collide with foreign objects to be damaged.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a mid-mounted motor for an electric vehicle. Background Art

[0002] Currently, electric vehicle motors are primarily external rotor motors, built directly into the wheel hub to avoid occupying frame space. Mid-mounted motors, on the other hand, are located outside the wheel hub, in the middle of the frame. The torque output by the mid-mounted motor is transmitted to the wheels via a chain or belt. Mounting the mid-mounted motor in the center of the frame maximizes front-to-back balance, reducing the imbalance felt when carrying loads, and making the ride more comfortable. During off-road riding, the mid-mounted motor is subject to less impact, minimizing the risk of damage and lowering the failure rate. In terms of power output, the mid-mounted motor, through chain or gear transmission, amplifies output torque, minimizes power loss, and achieves a high power conversion rate.

[0003] The existing utility model patent with announcement number CN203544281U discloses a mid-mounted motor assembly for an electric vehicle, including a motor, the motor is connected to a reducer, the reducer is connected to a transmission device, the transmission device is connected to the rear wheel of the electric vehicle, the reducer includes a rotating shaft, a first gear mounted on the rotating shaft and a second gear keyed to the output shaft of the motor, the second gear is meshed with the first gear, the reducer is connected to the transmission device, the transmission device includes a tensioner, a driving pulley, a driven pulley and a belt wrapped around the driving pulley and the driven pulley, and the tensioner is in contact with the belt.

[0004] Regarding the above-mentioned related technologies, the inventor believes that the transmission structure of the above-mentioned motor assembly protrudes excessively from one axial side of the motor, excessively occupies space in the width direction of the frame, and easily causes the power output wheel to protrude from the side wall of the frame. The structure is not compact enough and is easily damaged by collision with foreign objects. Utility Model Content

[0005] The present application provides a mid-mounted motor for an electric vehicle, wherein a power output wheel is located on one radial side of the motor housing, has a compact structure, occupies a small width of the vehicle frame, and the power output wheel is not easily damaged by collision with foreign objects.

[0006] This application provides an electric vehicle mid-mounted motor, which adopts the following technical solution:

[0007] A mid-mounted motor for an electric vehicle comprises a motor housing, wherein a stator and a rotor are provided in the motor housing, a motor shaft is fixed to the rotor, a gear box is fixedly mounted on the end face of the motor housing, an outer shell is integrally fixed to the inner side of the gear box, the outer shell is located on one radial side of the motor housing, the gear box and the outer shell are rotatably connected to an output shaft, an output wheel is fixed on the output shaft, and the output wheel is located on one radial side of the motor housing; a plurality of transmission gears are rotatably mounted in the gear box, adjacent transmission gears are meshed and connected, and the motor shaft and the output shaft are respectively fixed to two transmission gears at both ends of the gear box.

[0008] By adopting the above technical solution, the outer shell, output shaft and output wheel are all offset to the radial side of the motor housing, thereby avoiding occupying space in the width direction of the frame, making the structure more compact, and the output wheel is not easily damaged by collision with foreign objects.

[0009] Optionally, a left guard plate is installed outside the left end surface of the motor housing, and a right guard plate is installed outside the right end surface of the motor housing.

[0010] By adopting the above technical solution, both sides of the motor housing are shielded and protected by the left guard plate and the right guard plate, and the motor housing is more beautiful.

[0011] Optionally, several mounting columns 1 are fixed on the side of the left guard plate facing the motor housing, and mounting columns 2 connected to the mounting columns 1 are fixed to the motor housing. The left guard plate is provided with bolt mounting holes passing through the mounting columns 1, and the mounting columns 2 are provided with threaded holes for bolt threaded connections.

[0012] By adopting the above technical solution, the bolts are inserted into the bolt mounting holes and tightened to complete the fixation of the mounting column 1 and the mounting column 2, thereby fixing the left guard plate to the motor housing.

[0013] Optionally, a mounting column three is fixed to the end face of the gear box and is connected to the mounting column one.

[0014] By adopting the above technical solution, the installation position of the installation column one is increased by installing the third column, thereby improving the stability of the left guard plate after installation.

[0015] Optionally, three mounting posts are provided and distributed in a triangle.

[0016] By adopting the above technical solution, the triangular distribution can improve the stability of the left guard plate after installation.

[0017] Optionally, a secondary guard plate is installed on the right side of the motor housing, and the secondary guard plate blocks the right side of the output wheel.

[0018] By adopting the above technical solution, the auxiliary guard plate is used to protect one side of the end face of the output wheel to prevent external objects from hitting the output wheel.

[0019] Optionally, the auxiliary guard plate is arranged close to the right guard plate, and the shapes of the auxiliary guard plate and the right guard plate facing each other are adapted to each other.

[0020] By adopting the above technical solution, the gap between the auxiliary guard plate and the right guard plate can be minimized, thereby achieving a protective effect of blocking mud and water.

[0021] Optionally, the space inside the shell is communicated with the space inside the gear box, and a refueling port is provided on the top surface of the shell, and a sealing plug is threadedly connected to the refueling port.

[0022] By adopting the above technical solution, after removing the sealing plug, lubricating oil is added to the gear box through the oil filling port.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The output shaft and output wheel of this mid-mounted motor are offset to one side of the radial direction of the motor housing, thereby avoiding space occupation in the width direction of the frame. The thickness of the gearbox is also minimized, the structure is more compact, and the output wheel is not easily damaged by collision with foreign objects.

[0025] 2. The left and right guard plates are used to shield and protect both sides of the motor housing, making it more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of a mid-mounted motor for an electric vehicle according to an embodiment;

[0027] Figure 2 is a partial cross-sectional view of an embodiment;

[0028] Figure 3 is an exploded view of the embodiment.

[0029] Explanation of the accompanying symbols: 1. Motor housing; 2. Gearbox; 21. Outer casing; 3. Output shaft; 31. Output wheel; 22. Transmission gear; 4. Left guard plate; 5. Right guard plate; 41. Mounting column one; 11. Mounting column two; 42. Bolt mounting hole; 12. Threaded hole; 23. Mounting column three; 6. Auxiliary guard plate; 24. Fuel filler port; 25. Sealing plug. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the accompanying drawings.

[0031] Reference Figure 1This embodiment discloses a mid-mounted motor for an electric vehicle, including a motor housing 1 , wherein a stator and a rotor are provided in the motor housing 1 , a motor shaft is fixed to the rotor, and a gear box 2 is fixedly mounted on the end surface of the motor housing 1 .

[0032] Reference Figure 2 and Figure 3 A housing 21 is integrally fixed to the inner side of the gearbox 2. The housing 21 is located radially to one side of the motor housing 1, minimizing the width occupied by the vehicle frame. The gearbox 2 and the housing 21 are rotatably connected to an output shaft 3. An output wheel 31 is fixed to the output shaft 3. The output wheel 31 is located radially to one side of the motor housing 1, minimizing the width occupied by the vehicle frame. In this embodiment, the output wheel 31 is a sprocket, i.e., a chain is used to transmit power to the rear wheel of the electric vehicle.

[0033] Several transmission gears 22 are rotatably mounted within the gearbox 2, with adjacent transmission gears 22 meshing with each other. The motor shaft and output shaft 3 are respectively fixed to the two transmission gears 22 at each end of the gearbox 2. These transmission gears 22 form an acceleration or deceleration mechanism, varying the motor output speed range to match the designed speed range. It should be noted that the transmission gears 22 are all coplanar to minimize the thickness of the gearbox 2.

[0034] A left guard plate 4 is installed on the left end surface of the motor housing 1, and a right guard plate 5 is installed on the right end surface of the motor housing 1. The left guard plate 4 and the right guard plate 5 shield and protect both sides of the motor housing 1, and have a beautifying effect.

[0035] A plurality of mounting posts 41 are fixed to the side of the left guard plate 4 facing the motor housing 1. The motor housing 1 is fixed with mounting posts 11 docking with the mounting posts 1 41. The left guard plate 4 is provided with bolt mounting holes 42 passing through the mounting posts 1 41. The mounting posts 2 11 are provided with threaded holes 12 for the bolts to be threadedly connected. After inserting the bolts into the bolt mounting holes 42 and tightening them, the mounting posts 1 41 and 2 11 are fixed, thereby fixing the left guard plate 4 to the motor housing 1. The end face of the gearbox 2 is fixed with mounting posts 3 23 docking with the mounting posts 1 41. The mounting posts 1 41 and 23 are also fixed by bolts. There are three mounting posts 41, which are distributed in a triangle. This arrangement can improve the stability of the left guard plate 4 after installation. The installation structure of the right guard plate 5 and the motor housing 1 is similar to that of the left guard plate 4 and will not be described in detail here.

[0036] A secondary guard plate 6 is mounted on the right side of the motor housing 1. The secondary guard plate 6 shields the right side of the output wheel 31 and protects the end face of the output wheel 31 to prevent foreign objects from hitting the output wheel 31. The secondary guard plate 6 is placed closely against the right guard plate 5. The shapes of the secondary guard plate 6 and the right guard plate 5 facing each other are adapted to each other. This arrangement can minimize the gap between the secondary guard plate 6 and the right guard plate 5, thereby providing a protective effect against mud and water.

[0037] Reference Figure 3 The space inside the housing 21 is connected to the space inside the gear box 2. The top surface of the housing 21 is provided with a refueling port 24, and a sealing plug 25 is threadedly connected to the refueling port 24. After removing the sealing plug 25, lubricating oil is added to the gear box 2 through the refueling port 24.

[0038] The implementation principle of a mid-mounted motor for an electric vehicle in an embodiment of the present application is as follows: the output shaft 3 and the output wheel 31 of the mid-mounted motor are both offset to one radial side of the motor housing 1, thereby avoiding occupying space in the width direction of the frame. The thickness of the gearbox 2 is also minimized, the structure is more compact, and the output wheel 31 is not easily damaged by collision with foreign objects.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A mid-mounted motor for an electric vehicle, comprising a motor housing (1), wherein a stator and a rotor are arranged in the motor housing (1), and a motor shaft is fixed to the rotor, characterized in that: A gearbox (2) is fixedly mounted on the end surface of the motor housing (1); a housing (21) is integrally fixed to the inner side of the gearbox (2); the housing (21) is located on one radial side of the motor housing (1); the gearbox (2) and the housing (21) are rotatably connected to an output shaft (3); an output wheel (31) is fixed on the output shaft (3); the output wheel (31) is located on one radial side of the motor housing (1); a plurality of transmission gears (22) are rotatably mounted in the gearbox (2); adjacent transmission gears (22) are meshed and connected; the motor shaft and the output shaft (3) are respectively fixed to the two transmission gears (22) at both ends of the gearbox (2).

2. The mid-mounted motor for an electric vehicle according to claim 1, characterized in that: A left guard plate (4) is installed on the outside of the left end surface of the motor housing (1), and a right guard plate (5) is installed on the outside of the right end surface of the motor housing (1).

3. The mid-mounted motor of an electric vehicle according to claim 2, characterized in that: A plurality of mounting posts (41) are fixed to the side of the left guard plate (4) facing the motor housing (1), and a mounting post (11) docking with the mounting post (41) is fixed to the motor housing (1). The left guard plate (4) is provided with a bolt mounting hole (42) penetrating the mounting post (41), and the mounting post (11) is provided with a threaded hole (12) for the bolt to be threadedly connected.

4. The mid-mounted motor for an electric vehicle according to claim 3, characterized in that: The end surface of the gear box (2) is fixed with a mounting column three (23) that is docked with the mounting column one (41).

5. The mid-mounted motor for an electric vehicle according to claim 4, characterized in that: There are three mounting posts (41) arranged in a triangular distribution.

6. The mid-mounted motor for an electric vehicle according to claim 2, characterized in that: A secondary guard plate (6) is installed on the right side of the motor housing (1), and the secondary guard plate (6) shields the right side of the output wheel (31).

7. The mid-mounted motor for an electric vehicle according to claim 6, characterized in that: The auxiliary guard plate (6) is arranged closely to the right guard plate (5), and the shapes of the auxiliary guard plate (6) and the right guard plate (5) facing each other are adapted to each other.

8. The mid-mounted motor for an electric vehicle according to claim 1, characterized in that: The inner space of the housing (21) is communicated with the inner space of the gear box (2). The top surface of the housing (21) is provided with a fuel filling port (24), and a sealing plug (25) is threadedly connected to the fuel filling port (24).

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