A hot jacket tool

Abstract

The embodiment of the utility model provides a kind of hot jacket tool, it is related to motor field.The hot jacket tool of embodiment of the utility model includes base, pre-pressing piece and multiple connecting rods, multiple fixed positions are provided on base, multiple connecting rods are detachably connected with base, pre-pressing piece includes hoop part and connecting part, hoop part is connected with connecting part, and connecting part is connected with multiple connecting rods.When hot jacket stator core, shell is connected with multiple fixed positions, to fix shell in base, then stator core is placed into heated shell interior, then the hoop part of pre-pressing piece is hoop in the outside of stator core circumferentially, prevent stator core from cracking delamination in cooling shrinkage process;Then the connecting part of pre-pressing piece is connected with multiple connecting rods, so that pre-pressing piece is pressed in the stator core of hot jacket in the shell interior in axial direction, to ensure that the depth of stator core in shell interior is consistent, it is favorable to improve the qualified rate of product.

Description

Technical Field

[0001] This utility model relates to the field of motors, and more specifically, to a heat-shrinking tooling. Background Technology

[0002] The hot fitting process is often involved in the motor manufacturing process. The hot fitting process is an assembly process of stator core and motor housing. First, the motor housing is heated, which causes the inner diameter of the motor housing to deform and increase after being heated, forming a clearance fit with the stator core. As the temperature of the motor housing decreases, the clearance fit becomes an interference fit, so that the housing is firmly fitted on the outer wall of the stator core.

[0003] Currently, when assembling the stator core into the housing, a three-jaw internal support is typically used. The stator core is then placed into the preheated housing, and a weighted pressure plate is used to press it down on the top surface of the stator core. This assembly method is relatively crude. The assembly of the stator core and housing requires axial and circumferential precision. Using a pressure plate to press down on the stator core results in inconsistent heat-fitting depths across different parts of the stator core because the weight of the pressure plate is difficult to distribute evenly. Furthermore, the stator core cools and shrinks inside the housing after heat fitting, which can easily lead to cracking. Utility Model Content

[0004] This utility model provides a heat-fitting fixture that can solve the problems of inconsistent depth and cracking in different parts of the stator core during heat fitting.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a heat-shrinking fixture for assembling a motor. The motor includes a housing and a stator core. The heat-shrinking fixture includes: The base has multiple fixing positions for fixing the housing. Multiple connecting rods, which are detachably connected to the base; The pre-compression component includes a ring clamp and a connecting part. The ring clamp is connected to the connecting part. The ring clamp is used to circumferentially clamp the stator core to the outside. The connecting part is connected to multiple connecting rods and is used to press the stator core, which is heat-fitted inside the housing, in the axial direction.

[0006] Optionally, the base is provided with a threaded hole, and the connecting rod is a screw rod that is threadedly connected to the base.

[0007] Optionally, the base includes a plate and multiple positioning posts, the multiple positioning posts being connected to the plate and forming multiple fixed positions.

[0008] Optionally, at least some of the positioning posts may have different outer diameters.

[0009] Optionally, at least some of the locating posts are provided with axial holes.

[0010] Optionally, the axial hole is a threaded hole.

[0011] Optionally, there are multiple connecting parts, which are evenly distributed on the outer periphery of the ring and fixedly connected to the ring.

[0012] Optionally, the connecting rod is a screw rod, and the connecting part is provided with a through hole, through which the end of the screw rod can pass.

[0013] Optionally, the base is provided with a clearance groove for avoiding the housing or stator core.

[0014] Optionally, multiple fixed positions are distributed along the edge of the clearance groove.

[0015] The beneficial effects of this utility model embodiment: The heat-shrinking fixture of this utility model embodiment includes a base, a pre-pressing component, and multiple connecting rods. The base has multiple fixing positions, and the connecting rods are detachably connected to the base. The pre-pressing component includes a ring clamp and a connecting portion, which are connected to each other, and the connecting portion is connected to the multiple connecting rods. When heat-shrinking the stator core, the housing is connected to the multiple fixing positions to fix the housing to the base. Then, the stator core is placed inside the heated housing. The ring clamp of the pre-pressing component is then circumferentially clamped around the outside of the stator core to prevent cracking and delamination during cooling and shrinkage. The connecting portion of the pre-pressing component is then connected to the multiple connecting rods, causing the pre-pressing component to axially press the stator core heat-shrinking inside the housing, thereby ensuring a consistent depth of the stator core inside the housing and improving the product yield. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the heat-shrinking tooling provided in the embodiments of this utility model, which includes a stator core and a shell. Figure 2 This is a schematic diagram of the structure of the stator core and the heat-shrink tooling provided in the embodiments of this utility model; Figure 3 This is a schematic diagram of the structure of the base provided in an embodiment of the present utility model; Figure 4This is a schematic diagram of the structure of the housing provided in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the pre-compression component provided in an embodiment of this utility model.

[0018] Icons: 1-Base; 10-Plate; 101-Allowing groove; 11-Positioning post; 111-Axial hole; 12-Fixing position; 2-Connecting rod; 3-Pre-compression component; 30-Ring hoop; 31-Connecting part; 4-Housing; 40-Positioning hole; 5-Stator core. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] As described in the background section, the final product qualification rate is low due to precision issues when assembling the stator core into the housing. Currently, the stator core and housing are usually assembled using a heat-fitting process. After the stator core is placed inside the housing, it shrinks during the cooling process, leading to cracking and delamination. Furthermore, the use of pressure plates for pressing can easily result in inconsistent heat-fitting depths in different parts of the stator core.

[0028] In view of the above problems, the present invention provides a heat fitting tooling that can solve the above problems, and will be described in detail below.

[0029] Please refer to Figures 1 to 3 The heat fitting fixture includes a base 1, a pre-compression component 3, and multiple connecting rods 2. The base 1 is provided with multiple fixing positions 12, which are used to connect with different parts of the motor housing 4 to fix the motor housing 4. The multiple connecting rods 2 are detachably connected to the base 1, and the multiple connecting rods 2 are also connected to the pre-compression component 3. The pre-compression component 3 presses the stator core 5 to prevent the stator core 5 from deforming or displacing. The pre-compression component 3 includes a ring clamp 30 and a connecting part 31. The ring clamp 30 is connected to the connecting part 31, and the connecting part 31 is connected to the multiple connecting rods 2.

[0030] When assembling the housing 4 and stator core 5 using the heat-shrinking fixture of this utility model embodiment, the heated housing 4 is first connected to multiple fixing positions 12 to fix the housing 4 to the base 1. Then, the stator core 5 is placed inside the heated housing 4. The ring part 30 of the pre-pressing member 3 is then circumferentially ringed around the outside of the stator core 5 to prevent the stator core 5 from cracking and delaminating during the cooling and shrinkage process. Then, the connecting part 31 of the pre-pressing member 3 is connected to multiple connecting rods 2 and a certain axial pre-tightening force is applied to make the pre-pressing member 3 press the stator core 5 heat-shrinking inside the housing 4 in the axial direction, thereby ensuring that the stator core 5 is at a consistent depth inside the housing 4, which is beneficial to improving the product qualification rate.

[0031] refer to Figure 3 The base 1 includes a plate 10 and multiple positioning posts 11. The multiple positioning posts 11 can be connected to the plate 10 by a fixing method such as welding or integral molding, or they can be connected by a detachable method such as screwing or riveting. The multiple positioning posts 11 form multiple fixing positions 12, which are connected to the motor housing 4 to position and fix the motor housing 4.

[0032] In this embodiment, the positioning post 11 has an ear plate and a post body. The post body and the ear plate are integrally formed or welded together. The ear plate has screw holes, and the post body 10 has multiple spaced threaded holes. The diameters of the screw holes on the ear plate and the threaded holes on the post body 10 are matched with the threads. Bolts or screws can be used to fix the ear plate to the post body 10, thereby fixing the positioning post 11 to the post body 10. (Reference) Figure 4 The outer wall of the motor housing 4 is provided with multiple positioning holes 40. The multiple positioning holes 40 are adapted to the column of the positioning post 11. The column can be inserted into the positioning hole 40 to ensure that the motor housing 4 is in a horizontal state. After the column is inserted into the positioning hole 40, the housing 4 cannot be displaced or shaken.

[0033] Optionally, the threaded holes on the plate 10 that connect to the positioning pins 11 can be arranged in an array of multiple holes. This allows the ear plate to be replaced with different positions when connected to the plate 10, so that the positions of the multiple positioning pins 11 can be adjusted, thereby positioning and fixing motor housings 4 of various sizes.

[0034] Optionally, some of the positioning pins 11 are provided with axial holes 111, and positioning pins can be inserted into the positioning holes 40 and axial holes 111 of the housing 4 to ensure the consistency of the position of the housing 4. The axial hole 111 can also be a threaded hole, and the positioning pin can be replaced with a positioning screw. The positioning screw passes through the positioning holes 40 and axial holes 111 of the housing 4 in sequence to achieve screw connection. This method is also conducive to further preventing the housing 4 from displacing in the axial direction.

[0035] To prevent incorrect positioning of the housing 4 during connection with the positioning pins 11, the outer diameters of some of the positioning pins 11 can be made inconsistent. For example, the diameter of the positioning pin 11 in this part is smaller, and the shape of the lug is different, so that it can be quickly matched and connected with the positioning hole 40 on the outside of the housing 4.

[0036] The plate 10 is provided with a clearance groove 101. When the end of the housing 4 or the stator core 5 needs to extend beyond the plate 10, a solid plate 10 may not meet the requirements. In this case, a clearance groove 101 can be opened on the plate 10. The clearance groove 101 can penetrate the plate 10, so that the end of the housing 4 or the stator core 5 can be accommodated in or pass through the clearance groove 101, thereby enabling thermal fitting of different housings 4 and stator cores 5. Multiple positioning posts 11 are distributed along the edge of the clearance groove 101, which allows for quick positioning and fixing of the housing 4.

[0037] Continue to refer to Figure 2 When the connecting rod 2 is a screw, the plate 10 is also provided with a threaded hole that matches the screw thread to realize the screw connection between the connecting rod 2 and the plate 10. Specifically, both ends of the connecting rod 2 are provided with external threads. One end is threaded to the plate 10, and the other end is threaded to the preload 3. In this embodiment, there are four connecting rods 2, which are distributed near the four corners of the square plate 10, so that the axial preload can be applied evenly to the stator core 5. The four connecting rods 2 are all located outside the positioning post 11, which does not affect the assembly of the housing 4 and the positioning post 11. At the same time, when assembling the housing 4 and the positioning post 11, the connecting rods 2 can be removed from the plate 10 first to avoid affecting the assembly. In addition, the screw connection between the connecting rod 2 and the plate 10 can also be disassembled when the heat fitting fixture is not in use, which is convenient for transportation and storage.

[0038] refer to Figure 5 and combined Figure 1 The pre-compression component 3 includes a ring-shaped part 30 and a connecting part 31, which are welded together or integrally formed. In this embodiment, the ring-shaped part 30 is circular, and there are multiple connecting parts 31, which are evenly distributed on the outer periphery of the ring-shaped part 30. The multiple connecting parts 31 are beams or rods of equal length and extend along the radial plane of the ring-shaped part 30. Each of the multiple connecting parts 31 is provided with a through hole, so that the end of the connecting rod 2 can pass through the connecting part 31 and expose the external thread. The nut is screwed into the external thread of the connecting part 31, thereby connecting the pre-compression component 3 to the base 1 through the connecting rod 2. Tightening the nut can adjust the clamping force of the ring-shaped part 30 on the stator core 5, ensuring that the axial pressure of the ring-shaped part 30 on various parts of the stator core 5 is uniform. The pre-compression component 3 can apply a certain pre-pressure to the stator core 5 after heat fitting, preventing the stator core 5 from having inconsistent heat fitting depth or delamination cracking after cooling and shrinking.

[0039] The heat-fitting fixture of this embodiment ensures the horizontality of the heated housing 4 by using the base 1. After the stator core 5 is placed inside the housing 4, it facilitates the flushing of the stator core 5's ends, improving the consistency of the stator core 5's depth within the housing 4. Simultaneously, the connecting rod 2, in cooperation with the pre-pressing component 3, axially compresses the stator core 5, preventing abnormalities in its depth direction. The pre-pressing component 3 circumferentially tightens the stator core 5, preventing cracking and delamination during cooling and shrinkage, ultimately improving the assembly pass rate of the stator core 5 and housing 4. This heat-fitting fixture of this embodiment has a simple structure, is easy to use, and can be used for heat-fitting various models of housing 4 and stator core 5, exhibiting high applicability.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A heat-shrinking fixture for assembling a motor, the motor comprising a housing (4) and a stator core (5), characterized in that, The heat fitting tooling includes: The base (1) is provided with a plurality of fixing positions (12), which are used to fix the housing (4). Multiple connecting rods (2) are detachably connected to the base (1); The pre-compression component (3) includes a ring clamp (30) and a connecting part (31). The ring clamp (30) is connected to the connecting part (31). The ring clamp (30) is used to circumferentially clamp the stator core (5) to the outside. The connecting part (31) is connected to the plurality of connecting rods (2) and is used to press the stator core (5) heat-fitted inside the housing (4) in the axial direction.

2. The heat-shrink fitting according to claim 1, characterized in that, The base (1) is provided with a threaded hole, and the connecting rod (2) is a screw rod, which is threadedly connected to the base (1).

3. The heat-shrink fitting according to claim 1, characterized in that, The base (1) includes a plate (10) and a plurality of positioning posts (11), the plurality of positioning posts (11) being connected to the plate (10) and forming the plurality of fixed positions (12).

4. The heat-shrink fitting according to claim 3, characterized in that, At least some of the positioning posts (11) have inconsistent outer diameters.

5. The heat-shrink fitting according to claim 3, characterized in that, At least some of the positioning posts (11) are provided with axial holes (111).

6. The heat-shrink fitting according to claim 5, characterized in that, The axial hole (111) is a threaded hole.

7. The heat-shrink fitting according to claim 1, characterized in that, The number of the connecting parts (31) is multiple, and the multiple connecting parts (31) are evenly distributed on the outer periphery of the ring part (30) and fixedly connected to the ring part (30).

8. The heat-shrink fitting according to claim 7, characterized in that, The connecting rod (2) is a screw, and the connecting part (31) is provided with a through hole, through which the end of the screw can pass.

9. The heat-shrink fitting according to any one of claims 1-8, characterized in that, The base (1) is provided with a clearance groove (101) for avoiding the housing (4) or the stator core (5).

10. The heat-shrink fitting according to claim 9, characterized in that, The plurality of fixed positions (12) are distributed along the edge of the clearance groove (101).

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