Low-cost motor rotor assembly and assembly tool

Abstract

The utility model relates to the technical field of motor rotor assemblies, and discloses a low-cost motor rotor assembly, which comprises a motor shaft body, planar bonding parts arranged on the motor shaft body, planar positioning parts arranged between two adjacent bonding parts, adhesive layers arranged on the bonding parts, and magnetic steel fixed on the bonding parts through the adhesive layers. A magnetic steel ring is installed on the magnetic steel in an interference mode. An assembling tool for assembling a motor rotor assembly comprises a carrying seat, and the carrying seat is provided with a positioning column matched with the positioning part. According to the low-cost motor rotor assembly, the motor shaft body adopts the planar bonding portion to replace a magnetic steel groove structure in the prior art, the planar positioning portion replaces a protruding positioning rib to separate the bonding portion, and the bonding portion and the positioning portion are combined to remove a side wall structure of the magnetic steel groove. The size of a blank and the machining allowance of a finished product can be reduced in the machining process of the motor shaft body, and therefore the material cost and the manufacturing cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotor components, in particular to a low-cost motor rotor component and an assembly tool. Background Art

[0002] In the motor rotor assembly within the electronically controlled brake system, the motor rotor assembly generates electromagnetic torque driven by the rotating magnetic field generated by the energization of the stator assembly, and is an important component of the motor.

[0003] In the motor rotor assembly, the blank (cold-headed blank or non-cold-headed blank) is generally machined into an integral shape to form the motor shaft. After the forming, a concave magnetic steel groove is formed on the outer surface of the motor shaft for assembling the magnetic steel. A raised positioning rib is provided between two adjacent magnetic steel grooves to separate the magnetic steel grooves (such as Figure 1-Figure 2 As shown). The magnetic steel slot structure of this commonly used motor shaft is relatively complex. In order to adapt to this complex magnetic steel slot structure, a blank with a larger diameter needs to be used during processing, which results in a large processing allowance and a long working time, thus leading to a high overall cost. Utility Model Content

[0004] The purpose of the utility model is to provide a low-cost motor rotor assembly and assembly tooling to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a low-cost motor rotor assembly, comprising: a motor shaft body, the motor shaft body is provided with a planar bonding portion, and a planar positioning portion is provided between two adjacent bonding portions.

[0006] Preferably, the bonding portion is provided with an adhesive layer.

[0007] Preferably, the bonding portion is fixed with a magnetic steel through the adhesive layer.

[0008] Preferably, the magnetic steel is interference fitted with a magnetic steel ring.

[0009] An assembly tool for assembling a motor rotor assembly comprises a carrier, wherein the carrier is provided with a positioning column adapted to the positioning part.

[0010] Preferably, a guide sleeve is provided above the bonding portion.

[0011] Preferably, the guide sleeve is an annular structure with an outer diameter gradually increasing from top to bottom.

[0012] Preferably, the magnetic steel ring sleeve is provided with a pressure head.

[0013] Preferably, a push rod is arranged in the carrier.

[0014] Preferably, the push rod abuts against the motor shaft body.

[0015] The low-cost motor rotor assembly has the following benefits:

[0016] In this low-cost motor rotor assembly, the motor shaft body adopts a planar bonding portion to replace the magnetic steel slot structure in the prior art, and a planar positioning portion to replace the raised positioning ribs to separate the bonding portion. The combination of the bonding portion and the positioning portion removes the side wall structure of the magnetic steel slot, so that the motor shaft body can reduce its blank size and finished product processing allowance during the processing process, thereby reducing material and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a motor shaft in the prior art;

[0018] Figure 2 It is a top view of the motor shaft in the prior art;

[0019] Figure 3 A three-dimensional diagram of a low-cost motor rotor assembly provided by an embodiment of the present application;

[0020] Figure 4 A cross-sectional view of a low-cost motor rotor assembly provided by an embodiment of the present application;

[0021] Figure 5 for Figure 3 Schematic diagram of the motor shaft;

[0022] Figure 6 for Figure 5 Top view of the motor shaft;

[0023] Figure 7 A schematic diagram of an assembly tool provided in an embodiment of the present application;

[0024] Figure 8 A schematic diagram of a low-cost motor rotor assembly being assembled using an assembly tool;

[0025] Fig. 9 A schematic diagram of a component 1 formed by assembling a motor shaft body and a carrier;

[0026] Fig.10 A schematic diagram of component 2 formed by assembling component 1, magnetic steel and a guide sleeve;

[0027] Fig.11 A schematic diagram of component three formed by assembling component two, a magnetic steel ring and a pressure head;

[0028] Fig.12 This is a schematic diagram of the motor rotor assembly of component three being separated by the push rod.

[0029] In the figure: 1, motor shaft body; 11, bonding part; 12, positioning part; 2, magnetic steel; 3, magnetic steel ring; 4, carrier; 41, positioning column; 5, guide sleeve; 6, pressure head; 7, push rod; 8, magnetic steel groove; 9, positioning rib. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 5 , Figure 6 As shown, the utility model provides a low-cost motor rotor assembly, including: a motor shaft body 1, a boss structure is arranged on the top of the motor shaft body 1, the outer cylindrical surface of the boss cooperates with the inner ring of the motor bearing, two positioning holes are opened under the boss to facilitate the circumferential positioning of the motor rotor assembly during assembly, and a planar bonding portion 11 is arranged on the motor shaft body 1, and a planar positioning portion 12 is arranged between two adjacent bonding portions 11.

[0032] Specifically, Figure 3-Figure 4 As shown, glue is applied to the bonding portion 11 to form an adhesive layer, and the bonding portion 11 is fixed with the magnetic steel 2 through the adhesive layer, wherein the number of the bonding portions 11 is determined according to the number of the magnetic steels 2, and the magnetic steel ring 3 is interference-fitted on the magnetic steel 2, and the magnetic steel ring 3 adopts an annular structure, and its inner diameter can be changed according to the outer cylindrical surface formed by the magnetic steel 2 on the surface of the motor shaft body 1.

[0033] In this embodiment, if Figure 1-Figure 6 As shown, the motor shaft body 1 adopts a planar bonding portion 11 to replace the magnetic steel slot 8 structure in the prior art, and a planar positioning portion 12 replaces the raised positioning rib 9 to separate the bonding portion 11. The combination of the bonding portion 11 and the positioning portion 12 removes the side wall structure of the magnetic steel slot 8, so that the motor shaft body 1 can reduce its blank size and finished product processing allowance during the processing, thereby reducing material and manufacturing costs.

[0034] In the present application, the motor shaft body 1 has a simple structure and is relatively easy to process. The design of the positioning portion 12 and the bonding portion 11 can also improve the dimensional stability of the motor shaft body 1, thereby improving the dynamic balancing performance of the rotor. A plurality of magnetic steel rings 3 can be arranged in the motor rotor assembly. The magnetic steel rings 3 can be manufactured through a simple processing technique, including but not limited to stainless steel strip cutting, welding process manufacturing, and steel pipe cutting, so that the production of the magnetic steel rings 3 does not require mold opening, which can reduce material usage and further save costs.

[0035] like Figure 7-Figure 8 As shown, an assembly tool for assembling a motor rotor assembly comprises: a carrier 4, the carrier 4 is sleeved on the outside of the motor rotor assembly, the carrier 4 is provided with a positioning column 41 adapted to the positioning portion 12, the positioning column 41 is fitted to the positioning portion 12 on the motor shaft body 1, and a guide sleeve 5 is further provided above the bonding portion 11, the guide sleeve 5 is an annular structure with an outer diameter gradually increasing from top to bottom, and plays a guiding role for the magnetic steel ring 3, so that the magnetic steel ring 3 is sleeved on the outside of the magnetic steel 2, the magnetic steel ring 3 is sleeved with a pressure head 6, and the magnetic steel ring 3 is interference fit with the magnetic steel 2 through the pressure head 6, so as to ensure that the magnetic steel 2 can achieve position fixation and clamping force during work before the glue is cured, and a push rod 7 is further provided in the carrier 4, and the push rod 7 is abutted against the motor shaft body 1.

[0036] When assembling the motor rotor assembly, first place the processed motor shaft body 1 into the carrier 4, and the positioning column 41 on the carrier 4 positions the motor shaft body 1 axially and circumferentially to form an assembly (such as Fig. 9 As shown), glue is applied to the bonding portion 11 of component one using a glue coating device, the magnetic steel 2 is bonded to the bonding portion 11 of the motor shaft body 1, and then the guide sleeve 5 is put on the component one, so that the guide sleeve 5 is fixed on the top of the magnetic steel 2, forming component two (as shown in FIG. Fig.10 As shown), take two or more magnetic steel rings 3 and put them on the guide sleeve 5 on the component 2, and push the magnetic steel ring 3 downward until the magnetic steel ring 3 is set on the outside of the magnetic steel 2, put the pressure head 6 on the outside of the magnetic steel ring 3, and press the magnetic steel ring 3 to the preset position through the pressure head 6 to form the component 3 (as shown). Fig.11 As shown), the magnetic steel ring 3 and the magnetic steel 2 are interference-fitted to ensure that the magnetic steel 2 can achieve position fixation and clamping force during operation before the glue is cured, and the motor rotor assembly is pushed out of the carrier 4 using the push rod 7 (as shown in FIG. Fig.12 The motor rotor assembly is then placed in an external high temperature box for glue curing, and the motor rotor assembly is assembled.

[0037] The inventors found that in the prior art, a motor rotor assembly needs to use a magnetic steel sleeve as a stamping and drawing part during the assembly process. The mold has many steps and needs to be made of expensive non-magnetic and stainless steel materials. The material consumption is large and the overall cost is high. The magnetic steel sleeve needs to be assembled with other parts using a rotary riveting process. A plastic ring needs to be provided when the magnetic steel sleeve is riveted to prevent damage to the magnet during the riveting process, thereby increasing the material cost. The height of the magnetic steel sleeve also needs to be customized during assembly. Magnetic steel sleeves of the same height can only be used for motors of the same length in the same series. The versatility is poor and the assembly cycle is also long.

[0038] However, in the present application, the magnetic steel ring 3 in the motor rotor assembly replaces the magnetic steel sleeve. The magnetic steel ring 3 can be manufactured through a simple processing technology without the need for mold opening. Compared with the magnetic steel sleeve, the material usage can be greatly reduced, saving costs. The magnetic steel ring 3 adopts a press-fitting process (achieved by a pressure head 6) instead of a riveting process, and there is no need to use a plastic ring, further reducing the material cost. In addition, the distance between the magnetic steel rings 3 can be adjusted to adapt to motors of different lengths in the same series, and the universal effect is better.

[0039] In addition, in the prior art, the magnet 2 is positioned by a machined magnet groove 8, a stamped and stretched magnet sleeve, and an injection molded plastic ring. Different processing methods will lead to differences in processing accuracy, resulting in poor positioning accuracy and stability of the magnet 2, which can easily affect the motor performance. In the present application, the magnet 2 is positioned using an assembly tool, and its positioning accuracy and stability will be higher.

[0040] Working principle: first put the processed motor shaft body 1 into the carrier 4, and the positioning column 41 on the carrier 4 performs axial and circumferential positioning on the motor shaft body 1 to form component one, and use a glue coating device to apply glue on the bonding part 11 in component one, and bond the magnetic steel 2 to the bonding part 11 of the motor shaft body 1, and then put the guide sleeve 5 on the component one to fix the guide sleeve 5 on the top of the magnetic steel 2 to form component two, take two or more magnetic steel rings 3 and put them on the guide sleeve 5 on component two, and push the magnetic steel ring 3 downward until the magnetic steel ring 3 is set on the outside of the magnetic steel 2, put the pressure head 6 on the outside of the magnetic steel ring 3, and press the magnetic steel ring 3 to the preset position through the pressure head 6 to form component three, use the push rod 7 to push the motor rotor assembly out of the carrier 4, and then place the pushed motor rotor assembly in an external high-temperature box for glue curing, and the motor rotor assembly is assembled.

[0041] In summary, although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-cost motor rotor assembly, characterized in that: include: A motor shaft body (1), wherein the motor shaft body (1) is provided with a planar bonding portion (11), and a planar positioning portion (12) is provided between two adjacent bonding portions (11).

2. A low-cost motor rotor assembly according to claim 1, characterized in that: The bonding portion (11) is provided with an adhesive layer.

3. A low-cost motor rotor assembly according to claim 2, characterized in that: The bonding portion (11) is fixed with a magnetic steel (2) via the adhesive layer.

4. A low-cost motor rotor assembly according to claim 3, characterized in that: The magnetic steel (2) is interference-fitted with a magnetic steel ring (3).

5. A low-cost motor rotor assembly according to claim 4, characterized in that: The magnetic steel ring (3) is sleeved with a pressure head (6).

6. An assembly tool for assembling a motor rotor assembly according to any one of claims 1 to 5, characterized in that: include: A carrier (4), wherein the carrier (4) is provided with a positioning column (41) adapted to fit the positioning portion (12).

7. An assembly tool according to claim 6, characterized in that: A guide sleeve (5) is arranged above the bonding portion (11).

8. An assembly tool according to claim 7, characterized in that: The guide sleeve (5) is an annular structure whose outer diameter gradually increases from top to bottom.

9. An assembly tool according to claim 6, characterized in that: A push rod (7) is arranged inside the carrier (4).

10. An assembly tool according to claim 9, characterized in that: The push rod (7) abuts against the motor shaft body (1).

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