Wheel hub motor and electric vehicle

Abstract

The utility model provides a kind of wheel hub motor and electric vehicle, it is related to electric vehicle technical field.The wheel hub motor includes: outer rotor wheel hub, first brake and second brake;First brake is connected in the axial one end of outer rotor wheel hub, and second brake is connected in the axial other end of outer rotor wheel hub.It can utilize first brake and second brake to brake together, reduce the risk of high temperature failure of single brake due to long time, high load work, it is favorable to substantially shorten brake distance, especially in wet and slippery road surface or emergency braking situation, improve the braking stability, reduce the risk of sideslip, spin.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a hub motor and an electric vehicle. Background Technology

[0002] In-wheel motors, as the most widely used type of drive motor in the electric vehicle field, have the greatest technological advantage of eliminating the traditional transmission system and directly transmitting driving force to the wheels. This results in high driving efficiency, compact structure, and excellent operational reliability. However, with the increasing demands on braking safety and handling performance of electric two-wheelers, and the growing prominence of heat dissipation issues for in-wheel motors under continuous braking conditions, there is an urgent need to further improve their overall performance through structural optimization design. Utility Model Content

[0003] The purpose of this invention is to provide a hub motor and an electric vehicle to improve the braking stability of the hub motor.

[0004] In a first aspect, the hub motor provided by this utility model includes: an outer rotor hub, a first brake, and a second brake; The first brake is connected to one axial end of the outer rotor hub, and the second brake is connected to the other axial end of the outer rotor hub.

[0005] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the first brake and the second brake respectively include a disc brake device and a drum brake device.

[0006] In conjunction with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the outer rotor hub includes: a magnetic ring, a first end cover, and a second end cover; The magnetic coil, the first end cap, and the second end cap are coaxially arranged, and the magnetic coil is installed between the first end cap and the second end cap; The first brake is connected to the first end cap, and the second brake is connected to the second end cap.

[0007] In conjunction with the second possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein at least one of the first end cap and the second end cap is provided with a mounting groove; The drum brake device includes a brake drum installed inside the mounting slot.

[0008] In conjunction with the second possible implementation of the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the disc brake device includes a first brake disc. At least one of the first end cap and the second end cap is coaxially connected to the first brake disc.

[0009] In conjunction with the fourth possible implementation of the first aspect, this utility model provides a fifth possible implementation of the first aspect, wherein the disc brake device further includes a second brake disc, the second brake disc being coaxial with and spaced apart from the first brake disc.

[0010] In conjunction with the fifth possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein at least one of the first end cover and the second end cover is provided with a first shoulder and a second shoulder, the first brake disc abuts against the first shoulder, and the second brake disc abuts against the second shoulder.

[0011] In conjunction with the second possible implementation of the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein a rim is mounted on the outer side of the magnetic guide ring.

[0012] In conjunction with the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein the outer rotor hub is rotatably connected to the shaft; The shaft is provided with a wire hole that extends from the end of the shaft towards the center and communicates with the inner cavity of the outer rotor hub.

[0013] Secondly, the electric vehicle provided by this utility model is equipped with the hub motor described in the first aspect.

[0014] The present invention provides the following beneficial effects: by using a first brake connected to one axial end of the outer rotor hub and a second brake connected to the other axial end of the outer rotor hub, braking force can be applied to both axial ends of the outer rotor hub respectively. By using the first brake and the second brake together, the risk of high temperature failure of a single brake due to long-term, high-load operation is reduced, which is beneficial to significantly shorten the braking distance. Especially on wet and slippery roads or in emergency braking situations, it improves braking stability and reduces the risk of sideslip and fishtailing.

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A cross-sectional view of a hub motor provided in an embodiment of this utility model; Figure 2 A cross-sectional view of the first end cover of the hub motor provided in an embodiment of the present utility model; Figure 3 A cross-sectional view of the second end cover of the hub motor provided in an embodiment of this utility model.

[0018] Icons: 100-Outer rotor hub; 101-Mounting slot; 102-First shaft shoulder; 103-Second shaft shoulder; 110-Magnetic guide ring; 120-First end cover; 130-Second end cover; 200-First brake; 300-Second brake; 400-Brake drum; 500-First brake disc; 600-Second brake disc; 700-Rim; 800-Shaft; 801-Wire hole. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are only used to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 As shown, the hub motor provided in this embodiment of the present invention includes: an outer rotor hub 100, a first brake 200 and a second brake 300; the first brake 200 is connected to one axial end of the outer rotor hub 100, and the second brake 300 is connected to the other axial end of the outer rotor hub 100.

[0023] Specifically, the outer rotor hub 100 is a rotating component with an overall annular structure. It houses a stator assembly internally and a rotor assembly composed of permanent magnets externally, forming a typical outer rotor permanent magnet synchronous motor structure. The first brake 200 and the second brake 300 are configured as a redundant braking system: that is, in the event of a failure or malfunction of either brake, the other brake can still provide a minimum braking torque not lower than that required by vehicle braking regulations, thereby significantly improving driving safety. Furthermore, the control system can dynamically adjust the braking force distribution ratio between the two brakes according to driving conditions (such as emergency braking, energy recovery braking, etc.), optimizing braking efficiency and thermal management performance. Since the two brakes are distributed at both axial ends of the outer rotor hub 100, the heat generated during braking can be spatially dispersed, avoiding localized overheating that could lead to brake fade. Simultaneously, the dual-side braking layout helps balance axial forces, reducing off-center stress caused by single-side braking and extending the service life of the bearings and hub structure.

[0024] In this embodiment of the invention, the first brake 200 and the second brake 300 are each independently selected from either a disc brake or a drum brake. In other words, each brake can be either a disc brake or a drum brake, and the two can be the same or different, thereby achieving a variety of combinations.

[0025] In a preferred embodiment, the first brake 200 is a disc brake and the second brake 300 is a drum brake; or conversely, the first brake 200 is a drum brake and the second brake 300 is a disc brake. In another embodiment, both are disc brakes to achieve high-performance braking response; while in some applications that emphasize sealing and environmental adaptability, both can be drum brakes.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the outer rotor hub 100 includes: a magnetic ring 110, a first end cover 120, and a second end cover 130; the magnetic ring 110, the first end cover 120, and the second end cover 130 are coaxially arranged, and the magnetic ring 110 is installed between the first end cover 120 and the second end cover 130; a first brake 200 is connected to the first end cover 120, and a second brake 300 is connected to the second end cover 130.

[0027] The magnetic coil 110 is made of a high-permeability soft magnetic material (such as laminated silicon steel sheets) and is used to guide the distribution of the internal magnetic field of the motor, improving electromagnetic conversion efficiency. A permanent magnet array can be arranged on its outer periphery to form the outer rotor structure; a stator assembly is correspondingly arranged on its inner side, with the stator windings fixed to non-rotating components. When energized, it generates a rotating magnetic field, driving the outer rotor hub to rotate. The first end cover 120 and the second end cover 130 are located on both sides of the magnetic coil 110, serving as a sealing and support structure. On the one hand, they seal the internal space of the motor to prevent dust and moisture intrusion; on the other hand, they provide bearing mounting positions to support the rotational movement of the entire hub motor relative to the vehicle frame.

[0028] In an optional embodiment, at least one of the first end cap 120 and the second end cap 130 is provided with a mounting groove 101; the drum brake device includes a brake drum 400 mounted inside the mounting groove 101.

[0029] The brake drum 400 is made of high wear-resistant cast iron, and its inner surface is precision machined to ensure a stable coefficient of friction and uniform wear. Meanwhile, the design of the mounting groove 101 allows for a high degree of integration between the brake drum 400 and the end cover, reducing additional assembly space and contributing to a more compact overall design.

[0030] In an optional embodiment, the disc brake device includes a first brake disc 500; at least one of the first end cap 120 and the second end cap 130 is coaxially connected to the first brake disc 500, and a single disc brake structure can be formed using the first brake disc 500.

[0031] In addition, the disc brake device may also include a second brake disc 600, which is coaxial with and spaced apart from the first brake disc 500. The first brake disc 500 and the second brake disc 600 are connected to the same end cap, so that a double disc brake structure can be formed at least one end of the outer rotor hub 100 in the axial direction.

[0032] In a preferred embodiment, the first end cover 120 may be provided with a mounting groove 101, and a brake drum 400 may be connected within the mounting groove 101, thereby integrating a drum brake device at the first end cover 120; the second end cover 130 is connected to a first brake disc 500 and a second brake disc 600 to form a dual disc brake device. During braking, the brakes at both ends of the outer rotor hub 100 operate simultaneously, combining the braking advantages of both drum brakes and disc brakes, and balancing the braking forces at both ends of the axial direction, reducing the risk of excessive wear of a single brake and extending the maintenance cycle.

[0033] Furthermore, at least one of the first end cap 120 and the second end cap 130 is provided with a first shoulder 102 and a second shoulder 103, the first brake disc 500 abuts against the first shoulder 102, and the second brake disc 600 abuts against the second shoulder 103.

[0034] The first shoulder 102 and the second shoulder 103 are stepped structures that protrude axially from the end cap body, used for positioning and supporting the brake disc. The first shoulder 102 and the second shoulder 103 not only serve an axial positioning function, but also allow the first brake disc 500 to be connected to the first shoulder 102 via a flange and screws, and the second brake disc 600 to be connected to the second shoulder 103 via a flange and screws, thereby transmitting braking torque, improving disc mounting rigidity, and preventing vibration or deformation under high-speed rotation.

[0035] Furthermore, a rim 700 is mounted on the outer side of the magnetic guide ring 110. The outer circumference of the magnetic guide ring 110 has a rim mounting interface, and the rim 700 is fixed to the outer side of the magnetic guide ring 110 by bolts or snap-fit ​​structures, allowing the rim 700 to rotate synchronously with the magnetic guide ring 110. A tire is mounted on the rim 700, thus forming a complete electric vehicle wheel assembly. Since the outer rotor hub 100 directly drives the wheel rotation, intermediate transmission components such as chains and gears in traditional transmission systems are eliminated, effectively improving transmission efficiency and space utilization.

[0036] like Figure 1As shown, the outer rotor hub 100 is rotatably connected to the shaft 800. The shaft 800 has a wire hole 801, which extends from the end of the shaft 800 towards the center and communicates with the inner cavity of the outer rotor hub 100. Specifically, the shaft 800 has a wire hole 801 along its length, extending from the end of the shaft 800 towards the center and penetrating to a position near the inner cavity of the outer rotor hub 100. The motor's power supply wires and sensor signal lines (such as Hall elements, temperature sensors, etc.) are introduced into the hub through this wire hole 801, ultimately connecting to the stator windings or the built-in control module. All wiring is introduced from inside the central stationary shaft 800, avoiding the wear, interference, and waterproofing problems associated with traditional drag chains or slip ring structures, greatly improving the safety and reliability of the electrical connection. Furthermore, a sealing ring or rotary joint structure can be installed at the outlet of the wire hole 801 to prevent external dust or rainwater from entering the wire hole 801.

[0037] The electric vehicle provided in this embodiment of the utility model is equipped with the hub motor described in the above embodiments, and the electric vehicle has the technical advantages of the hub motor.

[0038] The hub motor and electric vehicle described in this embodiment have the following beneficial effects: 1. The hub motor uses combined braking at both ends of the axial direction to improve braking safety and redundancy; 2. The dual-brake design reduces the workload of a single brake, which can reduce the risk of brake overheating and failure, and can also extend the maintenance cycle and reduce maintenance costs. 3. The drum brake device is built into the mounting groove 101 of the end cover (first end cover 120 or second end cover 130), and the disc brake device is positioned by the axle shoulder (first axle shoulder 102 and second axle shoulder 103), saving space; 4. Shaft 800 is provided with wire hole 801, which realizes reliable power and signal transmission; 5. The first end cap 120 and the second end cap 130 together support and connect the magnetic coil 110, making the structure more stable.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hub motor, characterized in that, include: Outer rotor hub (100), first brake (200), and second brake (300); The first brake (200) is connected to one axial end of the outer rotor hub (100), and the second brake (300) is connected to the other axial end of the outer rotor hub (100).

2. The hub motor according to claim 1, characterized in that, The first brake (200) and the second brake (300) respectively include one of a disc brake device and a drum brake device.

3. The hub motor according to claim 2, characterized in that, The outer rotor hub (100) includes: a magnetic coil (110), a first end cap (120), and a second end cap (130). The magnetic coil (110), the first end cap (120) and the second end cap (130) are coaxially arranged, and the magnetic coil (110) is installed between the first end cap (120) and the second end cap (130); The first brake (200) is connected to the first end cap (120), and the second brake (300) is connected to the second end cap (130).

4. The hub motor according to claim 3, characterized in that, At least one of the first end cap (120) and the second end cap (130) is provided with a mounting groove (101); The drum brake device includes a brake drum (400) installed inside the mounting groove (101).

5. The hub motor according to claim 3, characterized in that, The disc brake device includes a first brake disc (500); At least one of the first end cap (120) and the second end cap (130) is coaxially connected to the first brake disc (500).

6. The hub motor according to claim 5, characterized in that, The disc brake device also includes a second brake disc (600), which is coaxial with and spaced apart from the first brake disc (500).

7. The hub motor according to claim 6, characterized in that, At least one of the first end cap (120) and the second end cap (130) is provided with a first shoulder (102) and a second shoulder (103), the first brake disc (500) abuts against the first shoulder (102), and the second brake disc (600) abuts against the second shoulder (103).

8. The hub motor according to claim 3, characterized in that, A rim (700) is mounted on the outside of the magnetic coil (110).

9. The hub motor according to claim 1 or 3, characterized in that, The outer rotor hub (100) is rotatably connected to the shaft (800); The shaft (800) is provided with a wire hole (801), which extends from the end of the shaft (800) toward the center and communicates with the inner cavity of the outer rotor hub (100).

10. An electric vehicle, characterized in that, The electric vehicle is equipped with a hub motor as described in any one of claims 1 to 9.

Images