A rotor assembly of a hub motor

Abstract

The present invention belongs to the technical field of external rotor motors, and specifically relates to a rotor assembly of a hub motor, including a rim; and a mounting ring, which is arranged inside the rim; the mounting ring includes: a base annular portion, whose outer circumference is connected to the inner wall of the rim, and whose inner circumference is used to install magnetic steel sheets; and a thickened portion on the left and a thickened portion on the right, which are respectively arranged on the left and right sides of the outer circumference of the base annular portion, and respectively cooperate with the base annular portion to form a punching position. Thus, the mounting ring is divided into three parts: a base annular portion, a thickened portion on the left and a thickened portion on the right. The base annular portion is directly connected to the rim, and the thickness can be made thinner, so that more magnetic steel sheets can be installed on the inner wall of the base annular portion. By thickening the local position of the mounting ring, the punching position of the mounting ring can realize the opening of the fixing hole while maintaining its own strength and preventing its own deformation or damage.

Description

Technical Field

[0001] The invention relates to the technical field of external rotor motors, and in particular to a rotor assembly of a hub motor. Background Art

[0002] The power of existing external rotor motors is usually related to the number of magnetic steel sheets. The more magnetic steel sheets there are, the greater the power generated by the motor, and vice versa. Therefore, the thickness of the mounting ring for mounting the magnetic steel sheets becomes an important factor affecting the number of magnetic steel sheets. The hub diameter is basically the same specification. The thinner the mounting ring is, the larger the diameter of the inner wall of the mounting ring for mounting the magnetic steel sheets is, and the longer the circumference is, so that more magnetic steel sheets can be installed, thereby achieving the effect of increasing the power of the motor.

[0003] For example, in the outer rotor of an electric vehicle hub motor with a spacer sleeve having Chinese patent application number 202011314369.1, the end cover of the hub motor is installed on the end face of the metal ring, and the thickness of the metal ring cannot be less than 6 mm, otherwise a hole cannot be opened (M5 inner hole) to connect the end cover, or the wall thickness of the hole is too thin on the surrounding side, and its strength cannot effectively achieve the installation and fixation of the end cover. Summary of the invention

[0004] The object of the present invention is to provide a rotor assembly for a hub motor.

[0005] The object of the present invention is achieved in that:

[0006] A rotor assembly of a hub motor, comprising

[0007] rims; and

[0008] A mounting ring disposed within the rim;

[0009] The mounting ring comprises:

[0010] A base annular portion, the outer circumference of which is connected to the inner wall of the rim, and the inner circumference of which is used to mount the magnetic steel sheet; and

[0011] The left thickened portion and the right thickened portion are respectively arranged on the left and right sides of the outer peripheral surface of the basic circular ring portion, and respectively cooperate with the basic circular ring portion to form a punching position.

[0012] Preferably, the thickened portion on the left side is an arc piece, which is adapted to the outer circumferential surface of the basic circular ring portion and is welded to the outer side of the basic circular ring portion close to the end face; the connection between the arc piece and the basic circular ring portion is the left punching position.

[0013] Preferably, the thickened portion on the left side is formed by bending the end of the basic circular ring portion outwardly to form a flange; the flange has a vertical circular ring surface, and the punching position is formed on the circular ring surface.

[0014] Preferably, a tire limiting groove for mounting a tire is provided in the middle of the rim, and the tire limiting groove includes a shallow groove section and a deep groove section; the middle of the basic annular portion is welded to the inner side of the deep groove section;

[0015] The flange and the deep groove section form a fixed groove; an arc piece is arranged in the fixed groove, and the outer end of the arc piece fits the inner side of the flange, and the inner end of the arc piece is welded to the outer wall of the deep groove section.

[0016] Preferably, the thickened portion on the left side is a folded strip formed by bending the end of the basic circular ring portion outward by 180 degrees; the folded strip fits the outer side surface of the basic circular ring portion, and the end of the folded strip extends to the rim wall and is welded as a whole.

[0017] Preferably, the thickness of the base annular portion is 2.5 mm to 3.5 mm.

[0018] Preferably, the thickness of both the left thickened portion and the right thickened portion is 2.5 mm-3.5 mm.

[0019] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0020] 1. The present invention divides the mounting ring into three parts: a basic annular portion, a thickened portion on the left, and a thickened portion on the right. The basic annular portion is directly connected to the rim, and the thickness can be made thinner so that more magnetic steel sheets can be installed on the inner wall of the basic annular portion. The thickened portion on the left and the thickened portion on the right are arranged on the outer circumferential surface of the basic annular portion, so that without affecting the installation of the magnetic steel sheets, the thickened portion on the left and the thickened portion on the right are connected to the basic annular portion to achieve the thickening of the punching position on the mounting ring, and then through the thickening of the local position of the mounting ring, the punching position of the mounting ring can maintain its own strength and prevent its own deformation or damage while being able to realize the opening of the fixing hole, so as to realize the installation of the end cover and ensure the connection strength when the end cover is installed on the mounting ring.

[0021] 2. The thickened portion on the left side and the thickened portion on the right side of the present invention can be designed as a variety of structures combined in pairs. The manufacturer can adjust the processed structure according to corresponding needs, and the scope of application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0023] Figure 2 It is a partial cross-sectional view of Example 1 before and after punching.

[0024] Figure 3 It is a partial cross-sectional view of Example 1 before and after punching.

[0025] Figure 4 It is a partial cross-sectional view of Example 2 before and after punching.

[0026] Figure 5 It is a partial cross-sectional view of Example 2 before and after punching.

[0027] Figure 6 It is a partial cross-sectional view of Example 3 before and after punching.

[0028] Figure 7 It is a partial cross-sectional view of Example 3 before and after punching.

[0029] Figure 8 It is a partial cross-sectional view of Example 4 before and after punching.

[0030] Fig. 9 It is a partial cross-sectional view of Example 4 before and after punching.

[0031] Fig.10 It is a partial cross-sectional view of Example 5 before and after punching.

[0032] Fig.11 It is a partial cross-sectional view of Example 5 before and after punching.

[0033] Fig.12 It is a partial cross-sectional view of Example 6 before and after punching.

[0034] Fig.13 It is a partial cross-sectional view of Example 6 before and after punching.

[0035] Figure numerals: 1, rim; 2, mounting ring; 3, basic annular portion; 4, thickened portion on the left; 5, thickened portion on the right; 6, left punching position; 7, right punching position; 8, left fixing hole; 9, right fixing hole; 10, tire limiting groove; 12, left fixing groove; 15, right fixing groove; 16, arc piece; 17, punching position; 18, flange; 19, shallow groove section; 20, deep groove section; 21, fixing groove; 22, folding strip. DETAILED DESCRIPTION

[0036] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1, as Figure 1-Figure 3As shown, a rotor assembly of a hub motor includes a rim 1 and a mounting ring 2. The mounting ring 2 is arranged inside the rim 1. The mounting ring 2 includes a base annular portion 3, a thickened portion 4 on the left, and a thickened portion 5 on the right. A tire limiting groove 10 for mounting a tire is arranged in the middle of the rim 1, and the tire limiting groove 10 includes a shallow groove section 19 and a deep groove section 20; the middle of the base annular portion 3 is welded to the inner side of the deep groove section 20, and the outer peripheral surface of the base annular portion 3 is connected to the inner wall of the wheel hub. In this embodiment, the middle of the base annular portion 3 is preferably welded to the inner side of the deep groove section 20. The inner wall of the base annular portion 3 is used to install the magnetic steel sheet as the rotor. The left thickened portion 4 and the right thickened portion 5 are respectively arranged on the left and right sides of the outer circumference of the base annular portion 3, and respectively cooperate with the base annular portion 3 to form a punching position 17, wherein the punching position 17 includes a left punching position 6 and a right punching position 7 corresponding to the left thickened portion 4 and the right thickened portion 5, respectively. The left punching position 6 and the right punching position 7 are respectively used by the manufacturer to punch and open the left fixing hole 8 and the right fixing hole 9, so that the manufacturer can install the left end cover and the right end cover of the hub motor.

[0038] The present application divides the mounting ring 2 into two parts: a basic annular portion 3 and a thickened portion. The basic annular portion 3 is directly connected to the rim 1, and the thickness can be made thinner so that more magnetic steel sheets can be installed on the inner wall of the basic annular portion 3. The thickened portion is arranged on the outer peripheral surface of the basic annular portion 3, so that without affecting the installation of the magnetic steel sheets, the thickened portion 4 on the left and the thickened portion 5 on the right are both connected to the basic annular portion 3 to achieve the thickening of the punching position on the mounting ring 2, and then through the thickening of the local position of the mounting ring 2, the punching position of the mounting ring 2 can maintain its own strength and prevent its own deformation or damage while being able to realize the opening of the fixing hole, so as to realize the installation of the end cover and ensure the connection strength when the end cover is installed on the mounting ring 2.

[0039] Furthermore, the thickness of the base annular portion 3 is preferably 2.5 mm to 3.5 mm, and further preferably about 3 mm; the thickness of the left thickened portion 4 and the right thickened portion 5 are both preferably 2.5 mm to 3.5 mm, and further preferably about 3 mm. Thus, the thickness of the thickest position of the mounting ring 2 is about 6 mm, which is convenient for the opening of the fixing hole, and the installation and fixing of the fasteners (such as bolts) and the end cover.

[0040] like Figure 2-3 As shown, the left thickened portion 4 can be an arc piece 16 adapted to the outer circumference of the base annular portion 3, which is welded to the outer side of the base annular portion 3 near the end surface. The connection between the arc piece 16 and the base annular portion 3 is the left punching position 6.

[0041] The thickened portion 5 on the right side is also an arc piece 16 adapted to the outer circumference of the basic annular portion 3, which is welded to the outer side of the basic annular portion 3 close to the end surface; the connection between the arc piece 16 and the basic annular portion 3 is the right punching position 7. Therefore, the installer only needs to weld to complete the installation of the basic annular portion 3 and the arc piece, and the local thickening of the installation ring 2 can be completed, which is simple and quick.

[0042] Embodiment 2, this embodiment is basically the same as embodiment 1, and the difference is as follows: Figure 4-5 As shown, the left thickened portion 4 is formed by bending the end of the basic annular portion 3 outward to form a flange 18; the flange 18 has a vertical annular surface, and a left punching position 6 is formed on the annular surface. The basic annular portion 3 and the left thickened portion 4 are integrally formed. The structure of this embodiment is simple and easy to process, and punching can be performed by simply bending and stretching.

[0043] The thickened portion 5 on the right side has the same shape as the thickened portion 4 on the left side.

[0044] Embodiment 3, this embodiment is basically the same as embodiment 2, and the difference is as follows: Figure 6-7 As shown, the flange 18 and the deep groove section 20 form a fixed groove 21; the fixed groove 21 is provided with an arc piece 16, and the outer end of the arc piece 16 is attached to the inner side of the flange 18, and the inner end of the arc piece 16 is welded to the outer wall of the deep groove section 20; wherein the left fixed groove 21 is the left fixed groove 12, and the outer surface of the left flange 18 is the left punching position 6. The movement of the arc piece 16 is limited by the fixed groove 21, so that the stability of the left thickened portion 4 and the right thickened portion 5 when they are arranged on the basic annular portion 3 is greatly improved compared with the embodiment 1.

[0045] The thickened portion 5 on the right side has the same shape as the thickened portion 4 on the left side.

[0046] Embodiment 4, this embodiment is basically the same as embodiment 1, and the difference is as follows: Figure 8-9 As shown, the thickened portion 4 is a folded strip 22 formed by bending the end of the basic annular portion 3 outward by 180 degrees; the folded strip 22 fits the outer side of the basic annular portion 3, and the end of the folded strip 22 extends to the wall surface of the rim 1 and is welded as a whole. The outer surface of the folded strip 22 on the left is the left punching position 6. The basic annular portion 3, the thickened portion 4 on the left, and the thickened portion 5 on the right can be stamped and formed at the same time when producing the mounting ring 2, and the processing steps of the corresponding structure are relatively simple and convenient.

[0047] The thickened portion 5 on the right side has the same shape as the thickened portion 4 on the left side.

[0048] Embodiment 5, as Figure 10-11As shown, there are differences between the thickened portion on the left and the thickened portion on the right. The thickened portion on the left is the same as that in Example 1, and the thickened portion on the right is the same as that in Example 3.

[0049] Embodiment 6, as Figure 12-13 As shown, there are differences between the thickened portion on the left and the thickened portion on the right. The thickened portion on the left is the same as that in Example 1, and the thickened portion on the right is the same as that in Example 4.

[0050] The four structures of the thickened portion 4 on the left side and the four structures of the thickened portion 5 on the right side can be respectively set correspondingly, so that there are a total of sixteen structural variations. The manufacturer can adjust the processed structure according to corresponding needs.

[0051] The arc piece 16 can also be replaced by a circular ring or a rectangular piece. The circular ring is sleeved on the basic circular ring part 3 , and the rectangular piece is directly attached to the outer circumference of the basic circular ring part 3 , both of which can achieve the same effect as the arc piece 16 .

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rotor assembly of a hub motor, comprising: Rim (1); as well as A mounting ring (2) arranged inside the rim (1); It is characterized in that The mounting ring (2) comprises: A base annular portion (3), the outer circumference of which is connected to the inner wall of the rim (1), and the inner circumference of which is used for mounting a magnetic steel sheet; and The left thickened portion (4) and the right thickened portion (5) are respectively arranged on the left and right sides of the outer peripheral surface of the basic circular ring portion (3), and respectively cooperate with the basic circular ring portion (3) to form a punching position (17); The thickened portion (4) on the left side is an arc piece, which is matched with the outer peripheral surface of the basic annular portion (3), and is welded to the outer side of the basic annular portion (3) close to the end surface; the connection between the arc piece and the basic annular portion (3) is the punching position (17); Alternatively, the thickened portion (4) on the left side is formed by bending the end of the basic annular portion (3) outwardly to form a flange (18); the flange (18) has a vertical annular surface, and the punching position (17) is formed on the annular surface; Alternatively, the thickened portion (4) on the left side is a folded strip (22) formed by bending the end of the base circular ring portion (3) outward by 180 degrees; the folded strip (22) fits the outer side surface of the base circular ring portion (3), and the end of the folded strip (22) extends to the wall surface of the rim (1) and is welded together.

2. The rotor assembly of a hub motor according to claim 1, characterized in that: A tire limiting groove (10) for mounting a tire is provided in the middle of the wheel rim (1), wherein the tire limiting groove (10) comprises a shallow groove section (19) and a deep groove section (20); the middle of the base annular portion (3) is welded to the inner side of the deep groove section (20); The flange (18) and the deep groove section (20) form a fixed groove (21); a circular arc piece is arranged in the fixed groove (21), and the outer end of the circular arc piece is in contact with the inner side of the flange (18), and the inner end of the circular arc piece is welded to the outer wall of the deep groove section (20).

3. The rotor assembly of a hub motor according to claim 1, characterized in that: The thickness of the basic annular portion (3) is 2.5 mm to 3.5 mm.

4. The rotor assembly of a hub motor according to claim 1, characterized in that: The thickness of the left thickened portion (4) and the right thickened portion (5) are both 2.5 mm to 3.5 mm.

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