Single-sided axle outer rotor wheel hub motor light-weight motor box

Abstract

The utility model discloses a single edge axle outer rotor wheel hub motor light weight motor box belongs to motor box technical field. The utility model discloses through optimizing motor box structure design and processing technology, realizes the light weight of motor box and the strength promotion. Specifically, the utility model will motor magnetism steel ring, aluminium package magnetism ring and motor box body are integrally formed through die casting or casting process. Among them, motor magnetism steel ring adopts the L type structure of precision machining, local optimization thickness, to satisfy magnetism demand and reduce weight, simultaneously, adopts local thickening design at the connecting part of motor box and motor end cover, has promoted the connecting strength and structural stability. The utility model discloses through the integration manufacturing, has reduced the assembly link, has improved production efficiency and product consistency, has effectively solved the problem that traditional wheel hub motor box is heavy, and the connecting strength is insufficient.

Description

Technical Field

[0001] This utility model relates to the field of hub motor housing technology, specifically a lightweight motor housing for a single-sided external rotor hub motor. Background Technology

[0002] In-wheel motors are widely used in new energy vehicles and other fields due to their advantages such as integration and high efficiency. However, the design of their motor housing directly affects the overall performance, weight, and reliability of the motor. Existing in-wheel motor housings suffer from problems such as excessive weight, low material utilization, and insufficient connection strength between the motor housing and end caps, leading to decreased operational stability, which limits the potential for lightweight and long-life development of in-wheel motors. In particular, the optimization of magnetic conductive components and the reliability of connection structures are key technical bottlenecks for improving the performance of in-wheel motors.

[0003] Therefore, a lightweight motor housing for a side-shaft external rotor hub motor is needed to solve the technical problems existing in the background art. Utility Model Content

[0004] Purpose of the utility model: To provide a lightweight motor housing for a single-sided external rotor hub motor. Through structural optimization and process innovation, it solves the problems of large weight, insufficient connection strength, and low integration in the existing motor housing, and achieves lightweight, high strength and high integration of the motor housing.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lightweight motor housing for a single-sided external rotor hub motor includes:

[0007] The motor housing is integrally formed using die casting or casting processes.

[0008] A magnetic guide steel ring for motors is installed inside the motor housing, and the magnetic guide area of ​​the magnetic guide steel ring for motors has an L-shaped structure;

[0009] An aluminum-encased magnetic ring is placed inside the motor housing and works in conjunction with the motor's magnetic steel ring.

[0010] The connection structure between the motor housing and the motor end cover has a metal wall thickness at the connection point between the motor housing body and the motor end cover that is 20-30% thicker than other areas of the motor housing body.

[0011] As a further improvement to the above technical solution:

[0012] The magnetic steel ring of the motor is integrally formed with the motor housing body through die casting or casting process.

[0013] The L-shaped magnetic conductive structure of the motor magnetic conductive steel ring refers to its cross-section being "L" shaped, and the structure includes a magnetic yoke and magnetic conductive teeth.

[0014] The thickened area of ​​the motor housing body is provided with threaded holes or positioning grooves for connecting the motor end cover.

[0015] The motor housing has bearing mounting positions for supporting the motor rotor.

[0016] The motor's magnetic steel ring is also provided with a hub mounting hole, and a metal hub sleeve is installed in the mounting hole.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Precision machining and thickness optimization of the magnetic conductive area of ​​the magnetic guide ring directly reduce the weight of the magnetic conductive components. The integration of the aluminum-encased magnetic guide ring with the magnetic guide steel ring, along with the optimized design of the motor housing, further reduces the overall material usage. The one-piece molding process eliminates the need for connecting parts (such as screws and seals), further reducing the overall weight of the motor housing. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the magnetic steel ring for the motor of this utility model.

[0020] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the internal structure of the motor housing of this utility model.

[0022] In the diagram: 1. Motor housing; 2. Motor magnetic steel ring; 3. Aluminum-clad magnetic ring; 4. Hub mounting hole; 5. Metal hub bushing; 6. Bearing position; 21. Magnetic guiding area; 23. Connection structure; 7. End cover. Detailed Implementation

[0023] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0024] like Figure 1-3 As shown, this embodiment discloses an integrated lightweight motor housing 1 suitable for hub motors of electric bicycles. The main body of the motor housing 1 is made of die-cast aluminum alloy.

[0025] Structural components:

[0026] Motor housing 1: Manufactured in one piece using die-casting process, including, etc. Figure 1 The diagram shows the outer and inner areas. The inner area has precision bearing holes for mounting bearings (marked as "Bearing Position 6" in the diagram).

[0027] Motor magnetic guide ring 2: Made of high-performance silicon steel sheets laminated together, its shape is an L-shaped magnetic guide structure. For example... Figure 1 As shown, the "motor magnetic guide ring 2" refers to the magnetic guide component encased inside the motor housing 1. The key magnetic guide area 21 of this L-shaped magnetic guide structure has been precision machined to optimize its thickness. For example, compared to the traditional design, the thickness has been reduced by about 10-15% to achieve the purpose of weight reduction, while still meeting the minimum magnetic guide cross-section requirements required for electromagnetic design.

[0028] Aluminum-encased magnetic coil 3: Located outside the magnetic steel coil 2 of the motor, it together with the magnetic steel coil forms the magnetic poles of the outer rotor. For example... Figure 1 As shown, "aluminum-clad magnetic coil 3" and "aluminum-clad L-shaped thickening" indicate that it is integrally formed with the motor housing 1. The aluminum-clad magnetic coil 3 is also locally thickened, especially in the area where it connects with the motor housing 1, where its outer wall is designed to be about 20-30% thicker than other parts of the motor housing 1.

[0029] Connection structure 23: The edge of the motor housing 1 is provided with a part for connection with the motor end cover. The wall thickness of the motor housing 1 is significantly increased to form a reinforcing rib or an integral thickened ring to provide sufficient thread strength and connection rigidity.

[0030] The motor magnetic steel ring 2 is also provided with a hub mounting hole 4, and a metal hub sleeve 5 is provided in the mounting hole.

[0031] Processing technology:

[0032] This invention employs a pressure die-casting process. First, the pre-machined magnetic steel ring and the aluminum-coated magnetic ring 3 are precisely placed in the internal positioning hole of the die-casting mold. Then, molten aluminum alloy is injected into the mold cavity under high pressure. During the cooling and solidification process, the molten aluminum alloy firmly covers and bonds the magnetic steel ring and the aluminum-coated magnetic ring 3, forming an integrated motor housing 1 structure.

[0033] Working principle:

[0034] The outer rotor (not shown in the figure) is mounted on a bearing inside the motor housing 1. The magnetic steel ring and the aluminum-encased magnetic ring 3 together form the rotor poles. Torque output is achieved by fixing the motor housing 1 to the stator (not shown in the figure). The lightweight design of the motor housing 1 reduces the rotor's moment of inertia, while the thickened design at the connection ensures the structural stability of the motor housing 1 and the end cover during motor operation.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lightweight motor housing for a single-sided external rotor hub motor, characterized in that, include: The motor housing is integrally formed using die casting or casting processes. A magnetic guide steel ring for motors is installed inside the motor housing, and the magnetic guide area of ​​the magnetic guide steel ring for motors has an L-shaped structure; An aluminum-encased magnetic ring is placed inside the motor housing and works in conjunction with the motor's magnetic steel ring. The connection structure between the motor housing and the motor end cover has a metal wall thickness at the connection point between the motor housing body and the motor end cover that is 20-30% thicker than other areas of the motor housing body.

2. The lightweight motor housing for a single-sided external rotor hub motor according to claim 1, characterized in that: The magnetic steel ring of the motor is integrally formed with the motor housing body through die casting or casting process.

3. The lightweight motor housing for a single-sided external rotor hub motor according to claim 1, characterized in that: The L-shaped magnetic conductive structure of the motor magnetic conductive steel ring refers to its cross-section being "L" shaped, and the structure includes a magnetic yoke and magnetic conductive teeth.

4. The lightweight motor housing for a single-sided external rotor hub motor according to claim 1, characterized in that: The thickened area of ​​the motor housing body is provided with threaded holes or positioning grooves for connecting the motor end cover.

5. The lightweight motor housing for a single-sided external rotor hub motor according to claim 1, characterized in that, The motor housing has bearing mounting positions for supporting the motor rotor.

6. The lightweight motor housing for a single-sided external rotor hub motor according to claim 1, characterized in that, The motor's magnetic steel ring is also provided with a hub mounting hole, and a metal hub sleeve is installed in the mounting hole.

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