Motor rotor and manufacturing method thereof

Abstract

The invention discloses a motor rotor and a manufacturing method thereof, and the method comprises the following steps: 1) heating the motor rotor to a preset temperature, and enabling the motor rotor to expand to enlarge the size of an inner hole; 2) mounting a motor rotor on the shaft; and (3) in the cooling process of the motor rotor, the size of an inner hole of the motor rotor is shrunk to be in close fit with the outer diameter of the shaft, and then connection between the motor rotor and the shaft is fixed. Reliable interference fit between the rotor and the shaft is achieved by heating the rotor, and the problem that in the prior art, connection between the rotor and the shaft is not firm or precision fit is difficult to achieve is solved.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a motor rotor and a manufacturing method thereof. Background Art

[0002] In the motor manufacturing process, the connection method between the rotor and the shaft is crucial. Although the traditional cold installation and mechanical press installation methods are simple, they may cause problems such as loosening during matching accuracy and long-term use.

[0003] Therefore, it is necessary to develop a new type of motor rotor and its manufacturing method in a targeted manner so that the motor rotor and the shaft can be closely matched and the operating performance and service life of the motor can be effectively improved. Summary of the invention

[0004] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a motor rotor and a method for manufacturing the same, which heats the rotor to achieve a reliable interference fit with the shaft, thereby solving the problem of loose connection or difficulty in achieving precise fit between the rotor and the shaft in the prior art.

[0005] Technical solution: A method for manufacturing a motor rotor of the present invention is characterized by comprising the following steps:

[0006] 1) heating the motor rotor to a predetermined temperature to expand the motor rotor and enlarge the inner hole size;

[0007] 2) Install the motor rotor onto the shaft;

[0008] 3) During the cooling process of the motor rotor, the inner hole size of the motor rotor shrinks to form a close fit with the outer diameter of the shaft, thereby fixing the connection between the motor rotor and the shaft.

[0009] Wherein, the heating in step 1) is carried out by heating in a heating furnace, induction heating or other heating devices.

[0010] The predetermined temperature in step 1) is the critical expansion temperature of the motor rotor material, ensuring that the rotor can be smoothly installed on the motor shaft.

[0011] Wherein, the motor rotor in step 1) is a rotor made of ferromagnetic material or other magnetic conductive materials.

[0012] Wherein, the heating temperature of the motor rotor in the step 1) is 100° C.-400° C., and the specific heating temperature is determined according to the material of the motor rotor.

[0013] Wherein, the fitting mode between the motor rotor and the shaft in the step 2) is interference fit.

[0014] Wherein, the interference between the motor rotor and the shaft in step 2) is 0.08mm-0.12mm.

[0015] Wherein, the contact surface of the motor rotor and the shaft in the step 2) is cleaned before installation to ensure a good fit between the rotor and the shaft.

[0016] The method for manufacturing a motor rotor of the present invention is characterized by comprising the following steps:

[0017] 1) After the motor rotor is pulled through the spline, milling is performed according to the predetermined procedure to complete the processing of the outer contour of the eight or nine teeth;

[0018] 2) Thermal installation is performed through precise positioning to ensure assembly accuracy and stability;

[0019] 3) Use the special tool of the machining center to mill the motor rotor and complete the processing of each oil groove hole;

[0020] 4) After heat treatment and carburizing, the motor rotor is surface ground to improve surface hardness and wear resistance;

[0021] 5) Through double-end surface grinding and outer contour grinding, the shape of the motor rotor meets the precision requirements, ensuring its normal operating performance and life, and completing the manufacturing.

[0022] A motor rotor is manufactured using the method for manufacturing a motor rotor of the present invention.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention heats the rotor to achieve a reliable interference fit with the shaft, thereby solving the problem of loose connection or difficulty in achieving precise fit between the rotor and the shaft in the prior art, so that the motor rotor and the shaft can be closely matched, effectively improving the operating performance and service life of the motor.

[0024] The present invention effectively improves the machining accuracy and service life of the hydraulic motor rotor through a sophisticated heat-fitting process and subsequent precision machining steps, is suitable for high-demand hydraulic system applications, and compensates for the end face clearance of the internal meshing gear motion cavity; ultimately, the volumetric efficiency of the motor under high pressure is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the installation structure of the motor rotor and the shaft of the present invention; the left side is the shaft and the right side is the motor rotor;

[0026] Figure 2 It is a heating temperature situation diagram of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the interference fit between the motor rotor and the shaft of the present invention;

[0028] Figure 4 It is a schematic diagram of the installation structure of the present invention;

[0029] Figure 5 It is a side view of the installation structure of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The method for manufacturing a motor rotor of the present invention comprises the following steps:

[0032] 1) The motor rotor is heated to a predetermined temperature to expand the inner hole size of the motor rotor; the heating is performed by heating in a heating furnace, induction heating or other heating devices; the predetermined temperature is the critical expansion temperature of the motor rotor material; the motor rotor is a rotor made of ferromagnetic material or other magnetic conductive material; the heating temperature of the motor rotor is 100°C-400°C, and the specific heating temperature is determined according to the motor rotor material.

[0033] 2) Install the motor rotor onto the shaft; the motor rotor and the shaft are fitted with an interference fit; the interference fit between the motor rotor and the shaft is 0.08mm-0.12mm; clean the contact surfaces before installing the motor rotor and the shaft.

[0034] 3) During the cooling process of the motor rotor, the inner hole size of the motor rotor shrinks to form a close fit with the outer diameter of the shaft, thereby fixing the connection between the motor rotor and the shaft.

[0035] The method for manufacturing a motor rotor of the present invention comprises the following steps:

[0036] 1) After the motor rotor is pulled through the spline, milling is performed according to the predetermined procedure to complete the processing of the outer contour of the eight or nine teeth;

[0037] 2) Thermal installation is performed through precise positioning to ensure assembly accuracy and stability;

[0038] 3) Use the special tool of the machining center to mill the motor rotor and complete the processing of each oil groove hole;

[0039] 4) After heat treatment and carburizing, the motor rotor is surface ground to improve surface hardness and wear resistance;

[0040] 5) Through double-end surface grinding and outer contour grinding, the shape of the motor rotor meets the precision requirements and the manufacturing is completed.

[0041] like Figure 1 and Figure 2 The present invention is implemented by high-frequency furnace heating according to actual application, and the precise matching of the rotor and the shaft is ensured by controlling the temperature and cooling rate.

[0042] like Figure 3 Before hot loading, the processed rotor and shaft are compared with the data before and after carburizing, and the change of data is confirmed by verifying the appropriate interference amount before hot loading through the pairing of interference amount. Finally, the interference amount of the rotor and shaft before hot loading is controlled at 0.08-0.12mm.

[0043] like Figure 4 and Figure 5 After the rotor is heated to a certain temperature, take the rotor out of the heated mold and place it on the work surface. Install the shaft vertically into the rotor along the special tooling guide and limit it with the positioning boss. The rotor and shaft are combined to ensure that there is no looseness. After cooling, the machining center is used to mill the oil grooves and process holes, flat grind and double-end grind the outer contour to achieve high-precision dimensions.

[0044] The present invention heats the rotor to achieve a reliable interference fit with the shaft, thereby solving the problem of loose connection or difficulty in achieving precise fit between the rotor and the shaft in the prior art, so that the motor rotor and the shaft can be closely matched, effectively improving the operating performance and service life of the motor.

[0045] The present invention effectively improves the machining accuracy and service life of the hydraulic motor rotor through a sophisticated heat-fitting process and subsequent precision machining steps, is suitable for high-demand hydraulic system applications, and compensates for the end face clearance of the internal meshing gear motion cavity; ultimately, the volumetric efficiency of the motor under high pressure is improved.

Claims

1. A method for manufacturing a motor rotor, characterized in that: The steps include: 1) heating the motor rotor to a predetermined temperature to expand the motor rotor and enlarge the inner hole size; 2) Install the motor rotor onto the shaft; 3) During the cooling process of the motor rotor, the inner hole size of the motor rotor shrinks to form a close fit with the outer diameter of the shaft, thereby fixing the connection between the motor rotor and the shaft.

2. The method for manufacturing a motor rotor according to claim 1, wherein: The heating in step 1) is performed by heating in a heating furnace, induction heating or other heating devices.

3. The method for manufacturing a motor rotor according to claim 1, wherein: The predetermined temperature in step 1) is the critical expansion temperature of the motor rotor material.

4. The method for manufacturing a motor rotor according to claim 1, wherein: The motor rotor in step 1) is a rotor made of ferromagnetic material or other magnetic conductive materials.

5. The method for manufacturing a motor rotor according to claim 1, wherein: The heating temperature of the motor rotor in step 1) is 100° C.-400° C., and the specific heating temperature is determined according to the material of the motor rotor.

6. The method for manufacturing a motor rotor according to claim 1, wherein: The matching mode between the motor rotor and the shaft in the step 2) is interference fit.

7. The method for manufacturing a motor rotor according to claim 6, wherein: The interference between the motor rotor and the shaft in step 2) is 0.08mm-0.12mm.

8. The method for manufacturing a motor rotor according to claim 1, wherein: In the step 2), the contact surfaces of the motor rotor and the shaft are cleaned before installation.

9. The method for manufacturing a motor rotor according to any one of claims 1 to 8, characterized in that: The steps include: 1) After the motor rotor is pulled through the spline, milling is performed according to the predetermined procedure to complete the processing of the outer contour of the eight or nine teeth; 2) Thermal installation is performed through precise positioning to ensure assembly accuracy and stability; 3) Use the special tool of the machining center to mill the motor rotor and complete the processing of each oil groove hole; 4) After heat treatment and carburizing, the motor rotor is surface ground to improve surface hardness and wear resistance; 5) Through double-end surface grinding and outer contour grinding, the shape of the motor rotor meets the precision requirements and the manufacturing is completed.

10. A motor rotor manufactured by the method for manufacturing a motor rotor according to claim 9.

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