A heat-shrinking fixture for motor housing for rapid positioning

Abstract

This invention provides a heat-fitting fixture for motor housings used for rapid positioning. The fixture includes a positioning body, a limiting block, and bolts. The positioning body has a ring-shaped structure with an inner hole for accommodating the motor stator. The top of the positioning body has multiple circumferentially distributed slots to avoid protrusions on the motor stator. The limiting block is fixedly connected to the outer periphery of the positioning body and indicates the installation direction of the motor housing. The bolts are detachably connected to the positioning body, with their positions corresponding to the cable outlets of the motor stator. This heat-fitting fixture for motor housings provides the advantage that operators can quickly identify the correct installation angle of the housing, avoiding rework due to misjudgment and significantly improving the first-time assembly success rate.

Description

Technical Field

[0001] This utility model relates to the field of motor assembly technology, and in particular to a motor housing heat fitting tool for rapid positioning. Background Technology

[0002] In the motor manufacturing process, the motor stator is usually assembled with the motor housing by means of heated expansion sleeve. This process requires a precise relative positional relationship between the stator and the motor housing to ensure the stability of subsequent rotor assembly and motor operation.

[0003] Traditional heat fitting fixtures mostly adopt an internal support structure, fixed in the inner hole of the stator, which has the following drawbacks: 1. The tooling is located inside the stator, which hinders the flow of hot air, affects the uniform cooling of the stator and the housing, and prolongs the process cycle; 2. Lack of guidance on the installation direction of the housing can easily lead to reversed or angularly misaligned assembly of the housing, resulting in product rework; 3. It is impossible to effectively avoid the protrusions on the stator, which can easily cause interference during assembly; 4. The outlet location is not marked, making it difficult for operators to determine the assembly direction and affecting consistency.

[0004] Therefore, it is necessary to provide a new motor housing heat fitting tooling for rapid positioning to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a motor housing heat fitting tool for rapid positioning.

[0006] The electric motor housing heat fitting tooling for rapid positioning provided by this utility model includes a positioning body, a limiting block, and bolts. The positioning body has a ring structure, and the inner hole of the positioning body is used to accommodate the motor stator. The top of the positioning body is provided with multiple circumferentially distributed slots, which are used to avoid protrusions on the motor stator. The limiting block is fixedly connected to the outer periphery of the positioning body and is used to indicate the installation direction of the motor housing. The bolts are detachably connected to the positioning body, and the bolt positions correspond to the outlet of the motor stator.

[0007] Preferably, the inner diameter of the positioning body is larger than the outer diameter of the motor stator insulation frame, and the inner diameter of the positioning body is smaller than the outer diameter of the stator core.

[0008] Preferably, the bottom of the positioning body has a recessed feature that matches the fins at the bottom of the motor housing.

[0009] Preferably, the number of slots is six, and the slots are evenly distributed around the top circumference of the positioning body. The six slots are adapted to the six protrusion structures on the motor stator.

[0010] Preferably, the limiting block is fixed to the outside of the positioning body by fixing bolts, and the exposed part of the limiting block has a visual mark. The limiting block is used to remind the operator to pay attention to the correct installation angle of the motor housing.

[0011] Preferably, the bolt is an indicator bolt, and the installation position of the indicator bolt corresponds one-to-one with the output position of the motor stator. The indicator bolt is used to protect the output end and assist in confirming the assembly direction during the heat fitting process.

[0012] Compared with related technologies, the motor housing heat fitting tooling for rapid positioning provided by this utility model has the following beneficial effects: the slot design effectively avoids the protrusion structure on the stator, avoids "jamming" or "forced assembly" caused by interference during the heat fitting process of traditional tooling, reduces operating resistance, and improves assembly smoothness; the limit block and the lead bolt form a dual direction guidance system, which allows operators to quickly identify the correct installation angle of the housing, avoids rework due to misjudgment, and significantly improves the first-time assembly success rate. Attached Figure Description

[0013] Figure 1 A schematic diagram of a preferred embodiment of the motor housing heat fitting tooling for rapid positioning provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the motor stator. Figure 3 for Figure 1 The diagram shows the structural schematic of the motor stator and slot assembly. Figure 4 for Figure 1 The diagram shows the structure of the positioning body. The following are labeled in the diagram: 1. Positioning body; 2. Housing; 3. Motor stator; 4. Limit block; 5. Fixing bolt; 6. Indicating bolt; 7. Slot. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Please refer to the following: Figure 1 , Figure 2 , Figure 3 as well as Figure 4 ,in, Figure 1 A schematic diagram of a preferred embodiment of the motor housing heat fitting tooling for rapid positioning provided by this utility model; Figure 2 for Figure 1The diagram shows the structure of the motor stator. Figure 3 for Figure 1 The diagram shows the structural schematic of the motor stator and slot assembly. Figure 4 for Figure 1 The diagram shows the structure of the positioning body.

[0016] In the specific implementation process, such as Figure 1-4 As shown, this utility model provides a motor housing heat fitting fixture for rapid positioning, comprising a positioning body 1, a limiting block 4, and bolts. The positioning body 1 has a ring structure, and its inner hole is used to accommodate the motor stator 3. The top of the positioning body 1 has multiple circumferentially distributed slots 7, which are used to avoid protrusions on the motor stator 3. The limiting block 4 is fixedly connected to the outer periphery of the positioning body 1 and is used to indicate the installation direction of the motor housing 2. The bolts are detachably connected to the positioning body 1, and the bolt positions correspond to the cable outlets of the motor stator 3. The inner diameter of the positioning body 1 is larger than the outer diameter of the insulation frame of the motor stator 3, and the inner diameter of the positioning body 1 is smaller than the outer diameter of the motor stator 3. The outer diameter of the sub-core, the bottom of the positioning body 1 is provided with a recessed feature, which matches the fins at the bottom of the motor housing 2, the number of slots 7 is six, the slots 7 are evenly distributed around the top circumference of the positioning body 1, the six slots 7 are adapted to the six protrusion structures on the motor stator 3, the limiting block 4 is fixed to the outside of the positioning body 1 by fixing bolts 5, the exposed part of the limiting block 4 has a visual mark, the limiting block 4 is used to remind the operator to pay attention to the correct installation angle of the motor housing 2, the bolt is an indicator bolt 6, the installation position of the indicator bolt 6 corresponds one-to-one with the outlet position of the motor stator 3, the indicator bolt 6 is used to protect the outlet end during the heat fitting process and assist in confirming the assembly direction; It should be noted that the inner diameter of the positioning body 1 is 0.1~0.3mm larger than the outer diameter of the insulation frame of the motor stator 3, and 0.2~0.5mm smaller than the outer diameter of the stator core. This ensures that the stator can be smoothly installed while achieving stable radial positioning, avoiding excessive assembly clearance that could lead to eccentricity. The positioning body 1 is made of high-strength aluminum alloy or 45# steel, and its surface is anodized or blackened to improve wear resistance and rust prevention. The recessed feature is an annular groove or multiple arc-shaped notches, the width and depth of which are the same as the bottom fins of the motor housing 2. The thickness and height of the plates are matched to achieve "one-click alignment" for quick positioning, preventing reverse installation of the housing 2 (such as 180° misalignment) and improving assembly consistency; the slot 7 is U-shaped, with a depth not less than 1.2 times the height of the protrusion of the motor stator 3, ensuring effective avoidance even when the housing 2 is fully fitted during the heat fitting process; the edges of the slot 7 are chamfered by 1~2mm to prevent sharp edges from scratching the stator insulation layer or operators; the exposed part of the limit block 4 is coated with red fluorescent paint, which can still be clearly identified in low light conditions, supporting the positioning... Different colors are used to distinguish different motor models, facilitating production line management. The fixing bolts 5 are anti-loosening bolts with nylon washers to prevent the limit block 4 from loosening or falling off due to vibration. The indicator bolts 6 have rounded heads to avoid sharp edges damaging the stator lead insulation layer during heat fitting. The length of the indicator bolts 6 is slightly higher than the lead terminal height (1-3mm higher), serving as a "positioning protection." The number and angle of the indicator bolts 6 can be flexibly adjusted according to different motor models, suitable for multi-variety co-production. This fixture is suitable for heat fitting processes where the housing 2 is heated to 120°C-180°C. The positioning body 1 will not deform or oxidize within this temperature range and can be used continuously for over 500 times. After heat fitting, the fixture, along with the stator assembly, can be placed on a wind-cooled platform. Because the fixture does not enclose the internal space of the stator, the cooling efficiency is more than 30% higher than traditional internal support fixtures. After assembly, first remove the indicator bolts 6 and limit block 4, then remove the stator along with the housing 2 from the positioning body 1. The fixture can be cleaned and reused.

[0017] The working principle provided by this utility model is as follows: Place the positioning body 1 on a high-temperature resistant, flat workbench, check whether its inner hole, groove 7, depression features, and threaded hole are clean and free of foreign objects, confirm that the positioning body 1 is not deformed or worn, and ensure that it can be used stably in the temperature range of 120°C to 180°C. The motor stator 3 to be assembled is vertically placed into the inner hole of the positioning body 1. Since the inner hole diameter is 0.1~0.3mm larger than the outer diameter of the insulating frame and 0.2~0.5mm smaller than the outer diameter of the stator core, the motor stator 3 can slide in smoothly and achieve precise axial and radial positioning to prevent eccentricity. Adjust the angle of the motor stator 3 so that the six protrusions on it are aligned with the six U-shaped slots 7 (evenly distributed in the circumference) on the top of the positioning body to ensure complete avoidance. Align the limiting block 4 with the mounting hole on the outer periphery of the positioning body 1, and use the fixing bolt 5 with nylon washer to firmly fix it to prevent vibration and loosening. The exposed part of the limiting block 4 is coated with red fluorescent paint (or a custom color) to visually indicate the correct installation direction of the motor housing 2 and prevent 180° reverse or angular deviation. According to the motor model, screw the round-headed indicator bolt 6 into the corresponding threaded hole. Its installation position corresponds one-to-one with the outlet of the motor stator 3. The length of the indicator bolt 6 is 1~3mm higher than the outlet terminal, which plays the role of "position protection" to prevent the housing 2 from squeezing the cable during the heat fitting process. The number and angle of the indicator bolt 6 are adjustable, which is suitable for multi-model co-line production. Place the motor housing 2 into the heating device and heat it to 120°C~180°C to expand its inner diameter, making it easier to fit the stator. The heating time is set according to the material and thickness of the housing 2 to ensure uniform heating. Using heat-resistant tools, the heated housing 2 is vertically inserted into the stator from above. The fins at the bottom of the housing 2 automatically embed into the annular groove or arc-shaped notch (sunken feature) at the bottom of the positioning body 1, achieving "one-click alignment" for quick positioning. This effectively prevents the housing 2 from being installed in reverse (such as 180° misalignment), improving assembly consistency. Since the depth of the groove 7 is not less than 1.2 times the height of the protrusion, and the edge has a 1~2mm chamfer, the housing 2 can be smoothly inserted, avoiding scratches or interference. The assembled components (including tooling) are transferred to the air-cooled platform or natural cooling area. Since the positioning body 1 is an external ring support structure with a through hole in the middle, it does not close the internal space of the stator. Heat can be quickly dissipated through the internal cavity of the stator. The cooling efficiency is more than 30% higher than that of traditional internal support tooling, which significantly shortens the process cycle. After the temperature of the housing 2 drops to room temperature, its inner diameter shrinks, forming a firm interference fit with the stator. First, remove the indicator bolt 6 and the fixing bolt 5, remove the limit block 4, and vertically remove the assembled motor assembly (motor stator 3 and housing 2) from the positioning body 1. Clean the tooling and check whether there is wear on key parts such as the slot and the recessed features, in preparation for the next use.

[0018] This motor housing heat-fitting fixture for rapid positioning has the following advantages: 1. By matching the recessed feature with the fins of the housing 2, "one-click alignment" is achieved, eliminating the need for repeated angle adjustments. The limiting block 4 and the indicator bolt 6 form a dual-directional guidance system, allowing operators to quickly identify the correct assembly direction and avoid trial and error. The tooling has an external ring support structure with a through hole in the middle, leaving the internal space of the motor stator 3 unsealed. Hot air can circulate freely through the inner cavity of the motor stator 3, significantly accelerating the cooling process, shortening the process cycle, and improving the production line cycle time. All components (limiting block 4 and indicator bolt 6) are detachable, allowing the finished product to be removed after disassembly. The operation is simple, and the tooling can be cleaned and reused, reducing the frequency of replacement and improving assembly efficiency. 2. The inner diameter of the positioning body 1 is 0.1~0.3mm larger than that of the insulating frame and 0.2~0.5mm smaller than that of the iron core, achieving "loose insertion and tight fixation". This facilitates installation and effectively limits radial runout, preventing the motor stator 3 from becoming eccentric. The six U-shaped slots 7 are evenly distributed circumferentially, with a depth ≥ 1.2 times the height of the protrusions, ensuring no scratching when the housing 2 is fully fitted. The edges of the slots 7 are chamfered by 1~2mm to prevent sharp edges from scratching the insulation layer or personnel, improving safety and assembly smoothness. The recessed features (grooves / notches) are physically matched with the fins of the housing 2, structurally eliminating the possibility of reverse installation. Combined with the visual markings of the limiting block 4, it achieves dual error prevention through "physical and visual" means, achieving 100% assembly consistency; ensuring assembly accuracy and consistency. 3. The indicator bolt 6 adopts a round head design to avoid damage to the cable from sharp edges. Its length extends 1-3mm beyond the output terminal, which serves as a "positioning protection" function to prevent insulation damage or lead wire breakage caused by high temperature housing 2. The inner hole size is reasonable and does not compress the insulation frame. The slot 7 is chamfered to prevent scratches from protrusions. The whole has no sharp edges and no forced assembly action, protecting the integrity of the motor stator 3; protecting the product and preventing damage. 4. The limit block 4 is coated with red fluorescent paint, which can still be clearly identified in low light conditions. It supports multiple color customization, making it easy to distinguish different motor models and adapt to flexible production line management. The fixing bolt 5 is an anti-loosening bolt with nylon washers to prevent vibration from causing the limit block 4 to loosen or fall off, ensuring reliable positioning throughout the process. The number and angle of the indicator bolts 6 are adjustable, which is suitable for motors with different output layouts. The configuration can be quickly switched, supporting multi-variety co-production and improving equipment utilization.

[0019] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.

[0020] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A heat-shrinking fixture for a motor housing for rapid positioning, comprising a positioning body (1), a limiting block (4), and bolts, wherein the positioning body (1) is a ring structure, characterized in that, The inner hole of the positioning body (1) is used to accommodate the motor stator (3). The top of the positioning body (1) is provided with a plurality of circumferentially distributed slots (7). The slots (7) are used to avoid the protrusions on the motor stator (3). The limiting block (4) is fixedly connected to the outer periphery of the positioning body (1). The limiting block (4) is used to indicate the installation direction of the motor housing (2). The bolt is detachably connected to the positioning body (1). The position of the bolt corresponds to the outlet of the motor stator (3).

2. The motor housing heat-fitting fixture for rapid positioning according to claim 1, characterized in that, The inner diameter of the positioning body (1) is greater than the outer diameter of the insulating frame of the motor stator (3), and the inner diameter of the positioning body (1) is smaller than the outer diameter of the stator core.

3. The motor housing heat-fitting fixture for rapid positioning according to claim 2, characterized in that, The bottom of the positioning body (1) is provided with a recessed feature, which matches the fins at the bottom of the motor housing (2).

4. The motor housing heat-fitting fixture for rapid positioning according to claim 3, characterized in that, The number of slots (7) is six. The slots (7) are evenly distributed around the top of the positioning body (1). The six slots (7) are adapted to the six protrusion structures on the motor stator (3).

5. The motor housing heat-fitting fixture for rapid positioning according to claim 4, characterized in that, The limiting block (4) is fixed to the outside of the positioning body (1) by fixing bolts (5). The exposed part of the limiting block (4) has a visual mark. The limiting block (4) is used to remind the operator to pay attention to the correct installation angle of the motor housing (2).

6. The motor housing heat-fitting fixture for rapid positioning according to claim 5, characterized in that, The bolt is an indicator bolt (6). The installation position of the indicator bolt (6) corresponds one-to-one with the output position of the motor stator (3). The indicator bolt (6) is used to protect the output end and assist in confirming the assembly direction during the heat fitting process.

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