Assembly method of motor rotor and core shaft and rotor shaft insertion tooling for implementing the method

Abstract

The invention discloses an assembly method of a motor rotor and a core shaft and a rotor shaft insertion tooling for implementing the method, belonging to the technical field of motor rotor press-in assembly process. The rotor shaft insertion tooling comprises a guide member for guiding the core shaft to enter the core shaft hole of the motor rotor and a cushion block for allowing the core shaft to pass through so that the core shaft extends out of the core shaft hole of the motor rotor. The guide member is provided with a guide hole for corresponding to the core shaft hole of the motor rotor and slidingly cooperating with the core shaft guide. The guide member has a guide member rotor matching portion for positioning and cooperating with the upper end portion of the motor rotor. The guide hole passes through the guide member rotor matching portion. The coaxiality of the guide hole and the core shaft hole of the motor rotor is ensured by positioning between the guide member rotor matching portion and the motor rotor, thereby solving the problem that the core shaft is easily pressed off when the core shaft is assembled with the motor rotor.

Description

Technical Field

[0001] The invention relates to an assembly method of a motor rotor and a core shaft and a rotor shaft insertion tool for realizing the method. Background Art

[0002] During the production and processing of motor rotor cores, installing the rotor shaft into the rotor core is an essential assembly process. However, during the assembly of the rotor shaft and the rotor core, in order to ensure that the motor shaft and the rotor core are fixed and stopped, the current assembly process generally uses an interference fit when pressing the motor shaft into the rotor core. Therefore, the assembly accuracy requirements for the motor shaft and the rotor core are more stringent.

[0003] The utility model patent with the authorization announcement number CN202940707U and the authorization announcement date 2013.05.15 discloses a rotor shaft insertion tool, including a tool lower chassis and a tool upper sleeve. The tool lower chassis is composed of a plurality of cylinders connected together. The tool lower chassis has a central cylindrical hole I for placing a core shaft. The tool upper sleeve is placed on the top of the cast aluminum rotor. The tool upper sleeve has a central cylindrical hole II for the core shaft to pass through. When assembling the cast aluminum rotor and the core shaft, the core shaft is first placed in the central cylindrical hole I of the tool lower chassis, and then the cast aluminum rotor is placed on the core shaft. Then, the tool upper sleeve is placed on the top of the cast aluminum rotor, and the press is started to push the tool upper sleeve to assemble the core shaft and the core shaft together. Among them, the cast aluminum rotor is the motor rotor. Although the utility model can realize the assembly of the motor rotor and the core shaft, since there is no matching relationship to ensure the pressing direction of the core shaft, it is very easy to be pressed off, and placing the force-applying end of the press on the motor rotor is easy to cause damage to the motor rotor. Summary of the invention

[0004] The purpose of the present invention is to provide a method for assembling a motor rotor and a core shaft, so as to solve the problem that the core shaft is easily pressed off when assembling the core shaft and the motor rotor; in addition, the purpose of the present invention is also to provide a rotor shaft insertion tooling for realizing this method.

[0005] To achieve the above-mentioned purpose, the first technical scheme of the method for assembling a motor rotor and a core shaft of the present invention is: the method for assembling a motor rotor and a core shaft comprises the following steps: using a cushion block to raise the motor rotor, positioning and assembling a guide member on the upper end of the motor rotor, and making the guide hole of the guide member correspond to the core shaft hole of the motor rotor, placing the core shaft into the guide hole and pressing the core shaft into the core shaft hole of the motor rotor by a pressure device, ensuring that the core shaft can be correctly inserted into the core shaft hole of the motor rotor through the positioning between the guide member and the motor rotor, thereby solving the problem that the core shaft is easily pressed off when assembling the core shaft and the motor rotor.

[0006] To implement the above method, the first technical solution of the rotor shaft entry tooling of the present invention is: the rotor shaft entry tooling includes a guide member for guiding the core shaft into the core shaft hole of the motor rotor and a pad for allowing the core shaft to pass through so that the core shaft extends out of the core shaft hole of the motor rotor. The guide member is provided with a guide hole for corresponding to the core shaft hole of the motor rotor and slidingly cooperating with the core shaft guide. The guide member has a guide rotor mating portion for positioning and cooperating with the upper end portion of the motor rotor. The guide hole passes through the guide rotor mating portion. The coaxiality of the guide hole and the core shaft hole of the motor rotor is ensured by positioning between the guide rotor mating portion and the motor rotor, thereby solving the problem that the core shaft is easily pressed off when the core shaft is assembled with the motor rotor.

[0007] The second technical solution of the rotor shaft fitting of the present invention is: on the basis of the first technical solution of the rotor shaft fitting of the present invention, the guide rotor matching portion has a guide positioning surface for circumferentially positioning with the circumferential surface of the step hole at the upper end of the motor rotor, and the positioning structure is simple and easy to implement.

[0008] The third technical solution of the rotor shaft fitting of the present invention is: on the basis of the second technical solution of the rotor shaft fitting of the present invention, the guide rotor mating portion has a guide support surface for mating with the annular plane stopper of the step hole at the upper end of the motor rotor to avoid damage to the motor rotor.

[0009] The fourth technical solution of the rotor shaft fitting of the present invention is: on the basis of the third technical solution of the rotor shaft fitting of the present invention, the guide rotor fitting part is a cylindrical structure, the outer circumferential surface of the guide rotor fitting part constitutes the guide positioning surface, and the lower end surface of the guide rotor fitting part constitutes the guide support surface, which further simplifies the structure and facilitates processing.

[0010] The fifth technical solution of the rotor shaft fitting of the present invention is: on the basis of the fourth technical solution of the rotor shaft fitting of the present invention, the guide member also has a guide member extension portion, the guide member extension portion and the guide member rotor matching portion are arranged up and down, and the guide hole passes through the guide member extension portion to increase the guiding ability of the guide hole.

[0011] The sixth technical solution of the rotor shaft fitting of the present invention is: on the basis of the fifth technical solution of the rotor shaft fitting of the present invention, the guide member includes a small diameter section and a large diameter section, the small diameter section of the guide member constitutes the guide member extension portion, and the large diameter section of the guide member constitutes the guide member rotor fitting portion, thereby reducing the weight of the guide member.

[0012] The seventh technical solution of the rotor shaft fitting of the present invention is: on the basis of any one of the first to sixth technical solutions of the rotor shaft fitting of the present invention, the gasket is provided with a gasket hole for accommodating the core shaft, the gasket has a gasket rotor matching portion for positioning and matching with the step hole at the end of the rotor, the gasket rotor matching portion has a gasket support surface for matching with the annular plane stop of the step hole at the lower end of the motor rotor, so as to avoid the core shaft contacting the gasket during press installation, thereby causing damage to the core shaft, thereby improving stability.

[0013] The eighth technical solution of the rotor shaft fitting of the present invention is: on the basis of the seventh technical solution of the rotor shaft fitting of the present invention, the pad rotor matching part has a pad positioning surface for circumferentially positioning with the circumferential surface of the step hole at the lower end of the motor rotor, and the positioning structure is simple and easy to implement.

[0014] The ninth technical solution of the rotor shaft fitting of the present invention is: on the basis of the eighth technical solution of the rotor shaft fitting of the present invention, the pad rotor fitting part is a cylindrical structure, the outer peripheral surface of the pad rotor fitting part constitutes the pad positioning surface, and the upper end surface of the pad rotor fitting part constitutes the pad support surface, which simplifies the structure and facilitates processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural explosion diagram of a specific embodiment 1 of the rotor shaft insertion tooling of the present invention;

[0016] Figure 2 It is a structural schematic diagram of a specific embodiment 1 of the rotor shaft insertion tooling of the present invention;

[0017] Figure 3 It is a bottom view of the structure of a specific embodiment 2 of the rotor shaft insertion tooling of the present invention;

[0018] Figure 4 It is a structural half-section diagram of a specific embodiment 2 of the rotor shaft insertion tooling of the present invention;

[0019] Figure 5 It is a bottom view of the structure of the specific embodiment 3 of the rotor shaft insertion tooling of the present invention;

[0020] Figure 6 It is a structural cross-sectional view of a specific embodiment 3 of the rotor shaft insertion tooling of the present invention;

[0021] Figure 7 It is a structural schematic diagram of a specific embodiment 4 of the rotor shaft insertion tooling of the present invention;

[0022] Figure 8 It is a structural schematic diagram of specific embodiment 5 of the rotor shaft insertion tooling of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] A specific embodiment 1 of the rotor shaft inserting tool of the present invention is as follows: Figure 1 to Figure 2 As shown, the motor rotor 2 to be assembled in this embodiment is a squirrel cage motor rotor, and the two ends of the motor rotor 2 are respectively provided with step holes, and the motor rotor 2 is assembled with the rotor core through the guide bar 203. The rotor shaft insertion tooling includes a guide 1 and a cushion block 3. In this embodiment, the guide 1 is a cylindrical structure, including a small diameter section and a large diameter section, and the small diameter section of the guide 1 is above the large diameter section of the guide 1 to reduce the overall weight of the guide 1, wherein the large diameter section of the guide 1 is the guide rotor matching part 102, and the small diameter section of the guide 1 is the guide extension part 103, and the guide extension part 103 is arranged concentrically with the guide rotor matching part 102. The guide member 1 is also provided with a guide hole 101 penetrating the guide member rotor matching portion 102 and the guide member core shaft guide portion 103. The guide hole 101 and the core shaft guide are slidably matched so that the core shaft 4 can be accurately inserted into the core shaft hole 201 of the motor rotor 2. In order to achieve better positioning accuracy of the core shaft 4 and the core shaft hole 201 of the motor rotor 2, the guide hole 101 and the core shaft 4 are clearance matched. In order to ensure the positioning accuracy of the core shaft 4 and the core shaft hole 201 of the motor rotor 2, it is not enough to only ensure the matching accuracy of the guide hole 101 and the core shaft 4, and it is also necessary to ensure the coaxiality of the guide hole 101 and the core shaft hole 201. Therefore, the outer circumferential surface of the guide member rotor matching portion 102 is circumferentially positioned and matched with the circumferential surface of the step hole 202 at the upper end of the motor rotor 2, and the outer circumferential surface of the guide member rotor matching portion 102 is the guide member positioning surface. Of course, in other embodiments, the guide rotor matching portion 102 may also be positioned and matched with the copper bar on the motor rotor 2 to ensure the coaxiality of the guide hole 101 and the core shaft hole 201 .

[0025] In this embodiment, in the process of press-fitting the core shaft 4, in order to provide better support for the guide 1, the bottom surface of the guide rotor matching portion 102 is matched with the annular plane of the step hole 202 at the upper end of the motor rotor 2, and the bottom surface of the guide rotor matching portion 102 is the guide support surface. In the process of guiding and sliding cooperation between the guide hole 101 and the core shaft 4, the longer the guide hole 101 is, the better the guiding effect is. Therefore, the guide extension portion 103 extends upward by a certain length to ensure a better guiding effect.

[0026] Because the mandrel 4 needs to extend a certain length out of the mandrel hole 201 of the motor rotor 2 for installation of the motor rotor 2 after being inserted into the mandrel hole 201 of the motor rotor 2, the pad 3 is provided with a pad hole 301 for accommodating the mandrel 4. In order to avoid contact between the mandrel 4 and the pad 3, the pad hole 301 and the mandrel hole 201 of the motor rotor 2 also need a certain positioning accuracy. Therefore, the pad 3 is a cylindrical structure, and the outer circumferential surface of the pad 3 is circumferentially positioned with the circumferential surface of the step hole at the lower end of the motor rotor 2. The outer circumferential surface of the pad 3 constitutes a gasket positioning surface for circumferentially positioning with the circumferential surface of the step hole at the lower end of the motor rotor 2. In the process of press-fitting the mandrel 4, the pad 3 also plays a role in supporting the motor rotor 2 and the guide 1. Therefore, the upper end surface of the pad 1 is the pad support surface for the annular plane stopper cooperation with the step hole at the lower end of the motor rotor 2. Of course, in other embodiments, it is also possible that the pad 3 mainly plays a supporting role, and the outer circumferential surface of the pad 3 is spaced apart from the circumferential surface of the step hole at the lower end of the motor rotor 2, but the diameter of the pad hole 301 is larger than the diameter of the core shaft 4.

[0027] The assembly method of the motor rotor and the core shaft of the present invention is as follows: during the press-fitting process of the core shaft 4, the cushion block 3 is first placed on the workbench of the press, and then the motor rotor 2 is placed on the cushion block 3 to raise the motor rotor 2, and then the guide member 1 is positioned and assembled on the upper end of the motor rotor 2, so that the guide hole 101 of the guide member 1 corresponds to the core shaft hole 201 of the motor rotor 2, and then the core shaft 4 is inserted into the guide hole 101 of the guide member 1, and the press is started to push the core shaft 4 downward, thereby completing the assembly of the core shaft 4 and the motor rotor 2.

[0028] The above-mentioned method for assembling the motor rotor and the core shaft is a specific embodiment of the method for assembling the motor rotor and the core shaft of the present invention.

[0029] The specific embodiment 2 of the rotor shaft insertion tool of the present invention is different from the specific embodiment 1 of the rotor shaft insertion tool of the present invention only in that: Figure 3 and Figure 4 As shown, two positioning ears 2104 are provided on the outer circumferential surface of the guide rotor matching part 2102, and the two positioning ears 2104 are both provided with positioning holes 2105 for the power supply rotor copper bars to pass through.

[0030] The specific embodiment 3 of the rotor shaft insertion tool of the present invention is different from the specific embodiment 1 of the rotor shaft insertion tool of the present invention only in that: Figure 5 and Figure 6 As shown, an annular protrusion 3104 is provided on the bottom surface of the guide rotor matching portion 3102, and a positioning hole 3105 for the copper bar to pass through is provided on the annular protrusion 3104.

[0031] The specific embodiment 4 of the rotor shaft insertion tool of the present invention is different from the specific embodiment 1 of the rotor shaft insertion tool of the present invention only in that: Figure 7 As shown, the guide member 41 is a cylindrical structure.

[0032] The specific embodiment 5 of the rotor shaft insertion tool of the present invention is different from the specific embodiment 1 of the rotor shaft insertion tool of the present invention only in that: Figure 8 As shown, the diameter of the spacer hole 5301 is larger than the diameter of the core shaft hole 5201.

[0033] Specific embodiment 6 of the rotor shaft fitting of the present invention differs from specific embodiment 1 of the rotor shaft fitting of the present invention only in that an outer circumferential surface of the pad is spaced apart from a circumferential surface of the step hole at the lower end of the motor rotor.

[0034] The specific embodiment 7 of the rotor shaft insertion tooling of the present invention is different from the specific embodiment 1 of the rotor shaft insertion tooling of the present invention only in that two spacers are provided, and a space is left between the two spacers for the core shaft to pass through.

Claims

1. Rotor shaft insertion tooling, characterized by: The invention comprises a guide member for guiding the mandrel into the mandrel hole of the motor rotor and a cushion block for allowing the mandrel to pass through so that the mandrel extends out of the mandrel hole of the motor rotor. The guide member is provided with a guide hole for corresponding to the mandrel hole of the motor rotor and slidingly cooperating with the mandrel guide. The guide member has a guide rotor cooperating portion for positioning and cooperating with the step hole at the upper end of the motor rotor. The guide hole penetrates the guide rotor cooperating portion. The cushion block has a cushion rotor cooperating portion for positioning and cooperating with the step hole at the lower end of the motor rotor. Both the guide rotor cooperating portion and the cushion rotor cooperating portion are cylindrical structures. The guide rotor cooperating portion has a circumferential positioning and cooperating portion with the circumferential surface of the step hole at the upper end of the motor rotor. The gasket has a gasket positioning surface that is circumferentially positioned with the circumferential surface of the step hole at the lower end of the motor rotor. During assembly, the core shaft is placed in the guide hole and the core shaft is pressed into the core shaft hole of the motor rotor through a pressure device. The outer circumferential surface of the guide rotor matching part constitutes the guide positioning surface, and the lower end surface of the guide rotor matching part constitutes the guide support surface. The guide also has a guide extension part, which is arranged up and down with the guide rotor matching part, and the guide hole passes through the guide extension part. The guide includes a small diameter section and a large diameter section. The small diameter section of the guide constitutes the guide extension part, and the large diameter section of the guide constitutes the guide rotor matching part.

2. The rotor shaft insertion tooling according to claim 1 is characterized in that: The guide rotor matching portion has a guide support surface for matching with the annular plane of the step hole at the upper end of the motor rotor.

3. The rotor shaft insertion tooling according to claim 1 or 2, characterized in that: The pad is provided with a pad hole for accommodating the core shaft, and the pad rotor matching portion has a pad support surface for matching with the annular plane stop of the step hole at the lower end of the motor rotor.

4. The rotor shaft insertion tooling according to claim 3 is characterized in that: The upper end surface of the pad rotor matching portion constitutes the pad support surface.

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