Motor shell heating device and motor assembling method
By setting a second heating part that strengthens the heating capacity in the motor housing heating device, the problems of scratches and aluminum chips occur when the motor stator is combined with the motor housing are solved, and a more uniform motor housing shrinkage and lower abnormal noise risk is achieved.
Patent Information
- Application Number
- CN202510028671.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-04-15
AI Technical Summary
When the motor stator is combined with the motor housing, scratches are likely to occur, resulting in residual aluminum chips and causing abnormal noise or insulation problems.
A motor housing heating device is adopted, which includes a first heating part and a second heating part. The second heating part heats in the bottom area of the motor housing, the first heating part heats on the upper side of the bottom area, and the heating capacity of the second heating part is stronger in the upper and lower directions unit length to ensure that the bottom area of the motor housing is fully heated.
By heating the bottom area of the motor housing, the consistency of its shrinkage is ensured, the possibility of scratching when the motor stator and the motor housing are combined is reduced, and the generation of aluminum chips is reduced.
Smart Images
Figure CN119834559A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of motors, and in particular to a motor housing heating device and a motor assembly method. Background Art
[0002] At present, the electric drive system assembly of vehicles tends to be high-voltage platform. The higher the working voltage of the electric drive system assembly, the higher the requirements for the cleanliness of the drive motor. It is required that there should be no foreign matter such as aluminum chips inside the drive motor. Once foreign matter appears inside the drive motor, it is easy to cause abnormal noise or even insulation problems. When the motor stator and the motor housing are assembled, it is easy to scratch and produce aluminum chips. These aluminum chips will remain inside the drive motor, causing abnormal noise or even insulation problems. Summary of the invention
[0003] The purpose of the present invention is to provide a motor housing heating device and a motor assembly method to reduce or eliminate the problem of scratches that are likely to occur when the motor stator and the motor housing are assembled.
[0004] A motor housing heating device described in the present invention includes a first heating part and a second heating part located below the first heating part, the second heating part is used to heat the bottom area of the motor housing, the first heating part is used to heat the area on the motor housing located above the bottom area, and the heating capacity of the second heating part per unit length in the up and down directions is higher than the heating capacity of the first heating part per unit length in the up and down directions.
[0005] Optionally, the first heating unit includes a first heating coil, and the second heating unit includes a second heating coil.
[0006] Optionally, the turn spacing of the second heating coil is smaller than the turn spacing of the first heating coil.
[0007] Optionally, the gap ratio of the second heating coil is smaller than the gap ratio of the first heating coil.
[0008] Optionally, the wire diameter of the second heating coil is consistent with the wire diameter of the first heating coil.
[0009] Optionally, the first heating coil and the second heating coil are connected in series.
[0010] Optionally, the first heating coil is a spiral coil with equal turn spacing.
[0011] Optionally, a bracket is further included, and the first heating coil and the second heating coil are sleeved on the outer periphery of the lower part of the bracket.
[0012] Optionally, the bracket includes a plurality of ribs extending in the up-and-down direction, the plurality of ribs are arranged at intervals from each other, and the first heating coil and the second heating coil are sleeved on the outer circumference of the plurality of ribs.
[0013] The present invention also proposes a motor assembly method, using any of the motor housing heating devices described above, comprising the following steps: The motor housing heating device is used to heat the motor housing; When the motor housing is heated to a preset temperature, taking out the motor housing heating device; The motor stator is press-fitted into the motor housing.
[0014] The present invention can ensure the consistency of the shrinkage of the motor housing by strengthening the heating of the bottom area of the motor housing, thereby reducing the possibility of scratches when the motor stator and the motor housing are assembled, and further reducing the possibility of aluminum chips generated when the motor stator and the motor housing are assembled. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is one of the structural schematic diagrams of the motor housing heating device described in some embodiments; Figure 2 This is a second structural schematic diagram of the motor housing heating device described in some embodiments; Figure 3 is a working schematic diagram of the motor housing heating device described in some embodiments; Figure 4 for Figure 3 A cross-sectional view of Figure 5 It is a schematic diagram of press-fitting a motor stator into a motor housing as described in some embodiments; Figure 6 The figure is a flow chart of the motor assembly method described in some embodiments.
[0016] In the figure, 1 is a coil assembly, 2 is a bracket, 3 is a motor housing, 4 is a motor stator, 11 is a first heating coil, 12 is a second heating coil, 13 is an end, 21 is a base plate, 22 is a rib plate, 23 is a support portion, 24 is a limiting ring, 31 is a housing side wall, and 32 is a housing bottom wall. DETAILED DESCRIPTION
[0017] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.
[0018] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0019] Through analysis, it was found that the reason why the motor stator and the motor housing are easily scratched and aluminum chips are generated when they are assembled is that when the motor housing is heated by a heating device, after the motor housing is heated and the heating device is pulled out of the motor housing, the motor housing is usually still placed on the production line. Since the bottom of the motor housing is placed on the production line, the heat in the bottom area of the motor housing is lost quickly. According to the principle of thermal expansion and contraction, the bottom area of the motor housing shrinks quickly. During the press-fitting process of the motor stator, it is easy to scratch the bottom area of the motor housing that shrinks quickly, thereby generating aluminum chips, which causes aluminum chips to remain inside the motor housing.
[0020] In order to reduce or eliminate the problem of scratches that may occur when the motor stator and the motor housing are assembled, this embodiment provides a motor housing heating device, such as Figure 1 and Figure 2 As shown, the motor housing heating device includes a first heating part and a second heating part located below the first heating part, the second heating part is used to heat the bottom area of the motor housing, the first heating part is used to heat the area on the motor housing located above the bottom area, and the heating capacity of the second heating part per unit length in the up and down directions is higher than the heating capacity of the first heating part per unit length in the up and down directions.
[0021] By adopting the above-mentioned motor housing heating device, by providing a second heating part with stronger heating capacity, it is possible to ensure that the bottom area of the motor housing is heated more without changing the heating time. Even when the motor stator is press-fitted after the heating is completed, the gap between the bottom area with a faster shrinkage speed and the motor stator can be ensured, thereby reducing the possibility of scratches when the motor stator and the motor housing are assembled together, and reducing the possibility of aluminum chips when the motor stator and the motor housing are assembled together.
[0022] In specific implementation, Figures 3 to 5 As shown, the motor housing 3 is generally surrounded by a housing side wall 31 and a housing bottom wall 32 , and the bottom area of the motor housing 3 includes the housing bottom wall 32 and the lower ends of the housing side wall 31 .
[0023] In some embodiments, the first heating unit includes a first heating coil 11, and the second heating unit includes a second heating coil 12. The heating unit is formed by using a heating coil, which has the characteristic of being easy to implement. In a specific implementation, the first heating coil 11 and the second heating coil 12 are both arranged around an axis extending in the up-down direction, and the first heating coil 11 is located on the upper side of the second heating coil 12.
[0024] In some embodiments, the turn pitch of the second heating coil 12 is smaller than the turn pitch of the first heating coil 11. By controlling the turn pitch, the gap ratio of the first heating coil 11 and the heating capacity of the second heating coil 12 can be controlled, which has the characteristic of being easy to implement.
[0025] In some embodiments, the gap ratio of the second heating coil 12 is smaller than the gap ratio of the first heating coil 11. With the above technical solution, the heating capacity of the second heating coil 12 can be stronger than that of the first heating coil 11 by reasonably setting the gap ratio of the heating coils.
[0026] As a specific example, the gap ratio of the first heating coil 11 is greater than 0.77, and the gap ratio of the second heating coil 12 is less than 0.77. In a specific implementation, the gap ratio of the first heating coil 11 can be set to 0.8, and the gap ratio of the second heating coil 12 can be set to 0.5. Using the above technical solution, the gap of the coil used to heat the motor housing in the prior art is usually 0.77. Reducing the gap ratio of the second heating coil 12 can improve the heating capacity of the second heating coil 12, and increasing the gap ratio of the first heating coil 11 is conducive to heat dissipation, which provides convenience for improving the heating capacity of the second heating coil 12.
[0027] As a specific example, the wire diameter of the second heating coil 12 is consistent with the wire diameter of the first heating coil 11. A coil assembly 1 can be used to form the first heating coil 11 and the second heating coil 12, that is, the first heating coil 11 is a part of the coil assembly 1, and the second heating coil 12 is another part of the coil assembly 1, which has the characteristic of being easy to implement.
[0028] As a specific example, the first heating coil 11 and the second heating coil 12 are connected in series. In a specific implementation, the first heating coil 11 and the second heating coil 12 can be connected to form a coil assembly 1, and two ends 13 of the coil assembly 1 can be fixed on the bracket 2.
[0029] As a specific example, the first heating coil 11 is a spiral coil with equal turn spacing. The spiral coil with equal turn spacing can uniformly heat the housing side wall 31 of the motor housing 3.
[0030] Obviously, in addition to using the first heating coil 11 to form the first heating part and using the second heating coil 12 to form the second heating part, other heating elements can also be used to form the heating part, such as using electric heating elements such as electric heating wires and electric heating films to form the heating part, and the heating capacity of the heating part can be adjusted by adjusting the number, structure and material of the electric heating elements.
[0031] In some embodiments, the motor housing heating device also includes a bracket 2, and the first heating coil 11 and the second heating coil 12 are sleeved on the outer periphery of the lower part of the bracket 2. The bracket 2 can provide support for the first heating coil 11 and the second heating coil 12, so as to facilitate placing the motor housing heating device into the motor housing and taking the motor housing heating device out of the motor housing.
[0032] In some embodiments, the bracket 2 includes a plurality of ribs 22 extending in the up-down direction, the plurality of ribs 22 are arranged at intervals from each other, and the first heating coil 11 and the second heating coil 12 are sleeved on the outer periphery of the plurality of ribs 22. The plurality of ribs 22 can provide a stable support for the first heating coil 11 and the second heating coil 12, and also have the characteristic of good heat dissipation performance.
[0033] As a specific example, the bracket 2 includes a base plate 21, a plurality of ribs 22 whose upper ends are fixedly connected to the base plate 21, a plurality of support portions 23 respectively arranged at the lower ends of the plurality of ribs 22, and a limiting ring 24 which is sleeved on and connected to the outer periphery of the plurality of ribs 22, the first heating coil 11 and the second heating coil 12 are sleeved on the outer periphery of the plurality of ribs 22, and the first heating coil 11 and the second heating coil 12 are confined between the limiting ring 24 and the plurality of support portions 23.
[0034] The present invention also provides a motor assembly method, using any of the motor housing heating devices described above, such as Figure 6 As shown, the motor assembly method includes the following steps: S100: heating the motor housing by using a motor housing heating device; S200: After the motor housing is heated to a preset temperature, the motor housing heating device is removed; S300: Press the motor stator into the motor housing.
[0035] By using a motor housing heating device to heat the motor housing, the possibility of scratches when the motor stator and the motor housing are assembled can be reduced, thereby reducing the possibility of aluminum chips generated when the motor stator and the motor housing are assembled.
[0036] Furthermore, in the above-mentioned motor assembly method, if the motor stator and the motor housing are scratched when assembled, the heating capacity of the second heating unit is increased. In specific implementation, the following method can be used to increase the heating capacity of the second heating unit: reduce the gap ratio of the second heating coil 12, and increase the gap ratio of the first heating coil 11. Reducing the gap ratio of the second heating coil 12 can improve the heating capacity of the second heating coil 12, and increasing the gap ratio of the first heating coil 11 can improve the heat dissipation capacity of the coil assembly 1, providing a basis for increasing the heating capacity of the second heating coil 12.
[0037] As a specific example, the above motor assembly method includes the following steps: like Figure 3 As shown, the motor housing 3 is heated by a motor housing heating device extending into the inner cavity of the motor housing 3, and the temperature of the motor housing 3 is heated to 160° C.-200° C., thereby ensuring that the bottom area of the motor housing 3 is heated more.
[0038] like Figure 4 As shown, after the motor housing heating device completes heating, the motor housing 3 is kept in a state of being pressed on the production line, and the motor stator 4 is pressed into the inner cavity of the motor housing 3 using a downward pressure of not less than 500N. When the motor housing 3 is cooled to below 120°C, the downward pressure is released.
[0039] When the motor housing 3 is cooled to below 45° C., the press-fit depth dimension of the motor stator 4 and the verticality between the joint surfaces of the motor stator 4 and the motor housing 3 are measured to meet the assembly requirements, and the press-fitting of the motor stator 4 is completed.
[0040] By adopting the above-mentioned motor assembly method, it can be ensured that the bottom area of the motor stator 4 and the motor housing 3 has a suitable assembly gap, which can reduce the possibility of scratches when the motor stator 4 and the motor housing 3 are assembled, and further reduce the possibility of aluminum chips generated when the motor stator 4 and the motor housing 3 are assembled.
[0041] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics of the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.
[0042] In the description of the present invention, it should be understood that the terms "upper", "lower" and the like indicate directions based on the attached Figure 1 The orientations represented by the coordinate system are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.
Claims
1. A motor housing heating device, characterized in that: It includes a first heating part and a second heating part located below the first heating part, the second heating part is used to heat the bottom area of the motor housing, the first heating part is used to heat the area above the bottom area on the motor housing, and the heating capacity of the second heating part per unit length in the up and down direction is higher than the heating capacity of the first heating part per unit length in the up and down direction.
2. The motor housing heating device according to claim 1, characterized in that: The first heating unit comprises a first heating coil (11), and the second heating unit comprises a second heating coil (12).
3. The motor housing heating device according to claim 2, characterized in that: The turn spacing of the second heating coil (12) is smaller than the turn spacing of the first heating coil (11).
4. The motor housing heating device according to claim 3, characterized in that: The gap ratio of the second heating coil (12) is smaller than the gap ratio of the first heating coil (11).
5. The motor housing heating device according to claim 3, characterized in that: The wire diameter of the second heating coil (12) is consistent with the wire diameter of the first heating coil (11).
6. The motor housing heating device according to claim 2, characterized in that: The first heating coil (11) and the second heating coil (12) are connected in series.
7. The motor housing heating device according to claim 2, characterized in that: The first heating coil (11) is a spiral coil with equal turn spacing.
8. The motor housing heating device according to claim 2, characterized in that: It also comprises a bracket (2), wherein the first heating coil (11) and the second heating coil (12) are sleeved on the outer periphery of the lower part of the bracket (2).
9. The motor housing heating device according to claim 8, characterized in that: The bracket (2) comprises a plurality of ribs (22) extending in an up-down direction, the plurality of ribs (22) being arranged at intervals from one another, and the first heating coil (11) and the second heating coil (12) being sleeved on the outer circumference of the plurality of ribs (22).
10. A motor assembly method, characterized in that: The motor housing heating device according to any one of claims 1 to 9 comprises the following steps: Using the motor housing heating device to heat the motor housing (3); When the motor housing (3) is heated to a preset temperature, taking out the motor housing heating device; The motor stator (4) is press-fitted into the motor housing (3).