Motor stator hot jacket tool

Abstract

The utility model relates to the field of motor manufacturing, in particular to a motor stator hot jacket tool. The motor stator shrinkage fit tool comprises a shrinkage fit upper seat and a shrinkage fit base. The hot jacket upper seat comprises a positioning tray and an inner support guide body arranged on the positioning tray; the inner supporting guide body is of a tubular structure internally provided with a cylindrical through hole. The positioning tray is provided with a positioning outer ring which protrudes upwards and is arranged around the periphery of the inner supporting guide body. The hot jacket base comprises a guide shaft, a heightening ring and a positioning chassis; a guide shaft is arranged in the middle of the positioning chassis; a limiting structure is arranged on the positioning base plate, so that the heightening ring is detachably arranged on the positioning base plate through the limiting structure, and the limiting structure limits the movement of the heightening ring at the positioning base plate. The shrinkage fit tool can realize the flexible adjustment of the depth position when the stator is in shrinkage fit with the casing, is simple and compact in structure, is convenient and simple to operate, can be suitable for being used as shrinkage fit tools of different stack thicknesses of motors, and is wide in adaptability, high in universality and practical.

Description

Technical Field

[0001] The utility model relates to the field of motor manufacturing, in particular to a motor stator shrink-fit tooling. Background Art

[0002] The motor assembly process is one of the main processes in motor production. The motor stator assembly process in the motor assembly often uses the shrinkage process, which uses the principle of thermal expansion and contraction to heat the containing part and expand it, then cool it, and the inner hole of the containing part shrinks to wrap the contained part. The shrinkage process is used in the motor stator assembly, which means that the contained part stator is assembled into the inside of the containing part motor housing.

[0003] As mentioned above, the matching process between the stator and the housing generally adopts the shrink fitting method, but the tooling suitable for the shrink fitting process on the market is large in size and the operation is relatively cumbersome.

[0004] In addition, when the existing shrink-fit tooling (a tooling formed by a shrink-fit upper seat and a shrink-fit base) is used to assist shrink-fitting, in the motor stator shrink-fitting process, the casing is usually clamped on the shrink-fit base, the stator is clamped and placed on the shrink-fit upper seat, and the casing is sleeved on the outside of the stator by hoisting the shrink-fit upper seat and embedding it into the shrink-fit base, so as to facilitate the subsequent heating expansion shrink-fitting step; however, due to the variety of stator sizes and casing specifications, the above-mentioned existing traditional shrink-fit tooling cannot be flexibly and adaptively adjusted to match the depth position requirements of different stators and casings, resulting in deviations in the positioning of the stator core and the casing in the depth direction, and the applicability and versatility of the tooling are poor.

[0005] Based on this, how to provide a heat shrink fitting with a simple and compact structure, which can flexibly adjust the depth position of the stator and the casing during heat shrink fitting, is a technical problem that technical personnel in this field are committed to solving. Utility Model Content

[0006] In order to solve the problems of the prior art mentioned in the background technology, the present application provides a motor stator shrink fitting, and its technical solution is as follows:

[0007] The motor stator shrink-fit tooling comprises a shrink-fit upper seat and a shrink-fit base; the shrink-fit upper seat comprises a positioning tray and an inner support guide body arranged on the positioning tray; wherein the inner support guide body is a tubular structure with a cylindrical through hole inside; the positioning tray is provided with a positioning outer ring which protrudes upward and is arranged around the circumference of the inner support guide body; an annular groove for accommodating the bottom of the stator is formed between the positioning outer ring and the positioning tray; the shrink-fit base comprises a guide shaft, a cushioning ring, and a positioning chassis; wherein a guide shaft which is mated with the cylindrical through hole is provided in the middle of the positioning chassis; a limiting structure is provided on the positioning chassis, so that the cushioning ring can be detachably installed on the positioning chassis through the limiting structure, and the limiting structure limits the movement of the cushioning ring at the positioning chassis.

[0008] In some embodiments, the limiting structure is an inner ring boss; the positioning chassis is provided with an inner ring boss arranged around the outer circumference of the guide shaft, and the inner ring boss is fitted and matched with the raising ring, and the raising ring is detachably clamped on the inner ring boss.

[0009] In some embodiments, with the axis of the guide shaft as the center, the positioning chassis is provided with the inner ring boss and the outer ring boss arranged around the outer circumference of the guide shaft in sequence from the inside to the outside; wherein the outer ring boss is fitted and matched with the casing so that the casing can be fitted on the outer ring boss during heat shrink fitting.

[0010] In some embodiments, the inner support guide body includes a guide sleeve and a guide ring; wherein the guide sleeve is a tubular structure having the cylindrical through hole inside, and the guide ring is detachably mounted on the outer periphery of the guide sleeve.

[0011] In some embodiments, the guide sleeve includes a base plate and a tubular boss structure arranged on the base plate; the tubular boss structure is fitted and matched with the guide ring so that when the guide ring is detachably mounted on the outer periphery of the guide sleeve, the bottom end surface of the guide sleeve is against the upper surface of the base plate.

[0012] In some embodiments, the positioning outer ring is a circular outer ring, and the outer diameter of the positioning outer ring is less than or equal to the outer diameter of the stator.

[0013] In some embodiments, a plurality of clearance grooves are provided along the upper end of the positioning outer ring, and the clearance grooves are used to avoid the stator wire frame; wherein, when the stator is installed in the annular groove, the stator wire frame is located at the clearance grooves so that the bottom end surface of the stator metal core is flatly fitted with the upper end edge of the positioning outer ring.

[0014] In some embodiments, the guide shaft is a cylindrical structure, and the cylindrical through hole is a cylindrical through hole that fits and matches therewith.

[0015] In some embodiments, the inner ring boss and the outer ring boss are circular ring bosses, and the raising ring is a circular ring structure; the axes of the inner ring boss and the outer ring boss are coaxial with the axis of the guide shaft, and the coaxiality of the axes of the inner ring boss and the outer ring boss with the axis of the guide shaft is less than or equal to 0.02 mm.

[0016] In some embodiments, the top end of the guide sleeve is provided with a hole for passing and installing a traction rope;

[0017] In some embodiments, the bottom end of the guide sleeve is detachably fixedly connected to the positioning tray via a first fastener;

[0018] In some embodiments, the junction between the top surface of the guide sleeve and its side surface adopts an arc surface transition;

[0019] In some embodiments, a circular arc surface transition is used at the junction between the top surface of the guide ring and its side surface.

[0020] In some embodiments, the bottom end of the guide shaft is detachably fixedly connected to the positioning chassis via a second fastener;

[0021] In some embodiments, the top end of the guide shaft is configured as a truncated cone structure.

[0022] The motor stator shrink-fit tooling provided by the utility model can realize the flexible adjustment of the depth position when the stator and the casing are shrink-fitted, and has a simple and compact structure, convenient and simple operation, and can be used as a shrink-fit tooling for motors with different stacking thicknesses. It has wide adaptability, strong versatility and is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a shrink fit tooling provided in one embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the partial structural disassembly of a shrink fit tooling provided in one embodiment of the utility model;

[0026] Figure 3 A schematic diagram of the partial structural disassembly of a shrink fit upper seat of a shrink fit tooling provided in one embodiment of the utility model;

[0027] Figure 4 A schematic structural diagram of a heat-shrink fitting base of a heat-shrink fitting provided in one embodiment of the utility model;

[0028] Figure 5 A schematic diagram of the partial structural disassembly of a heat-shrink fitting base of a heat-shrink fitting provided in one embodiment of the utility model;

[0029] Figure 6 A schematic diagram of the structure of the shrink fit tooling provided in one embodiment of the utility model after the stator and the housing are assembled;

[0030] Figure 7 for Figure 6 Schematic diagram of partial structural disassembly of the shrink fitting tooling after assembly Figure 1 ;

[0031] Figure 8 for Figure 6 Schematic diagram of partial structural disassembly of the shrink fitting tooling after assembly Figure 2 ;

[0032] Fig. 9 for Figure 6 Schematic diagram of partial structural disassembly of the shrink fitting tooling after assembly Figure 3 ;

[0033] Fig.10 for Figure 6 Longitudinal section of the shrink fit tooling after assembly.

[0034] Reference numerals:

[0035] 10 shrink fit tooling, 20 stator, 30 housing, 100 shrink fit upper seat, 110 guide sleeve, 120 guide ring, 130 positioning tray, 140 first fastener, 111 cylindrical through hole, 112 tubular boss structure, 113 hole, 114 bottom plate, 131 positioning outer ring, 132 make way groove, 133 annular groove, 200 shrink fit base, 210 guide shaft, 220 spacer ring, 230 positioning chassis, 240 second fastener, 211 cone structure, 231 inner ring annular boss, 232 outer ring annular boss, 21 metal core. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] The utility model provides Figure 1-10 The motor stator shrink-fit tool 10 shown in the embodiment:

[0039] The motor stator shrink-fit tool 10 comprises a shrink-fit upper seat 100 and a shrink-fit base 200; the shrink-fit upper seat 100 comprises a positioning tray 130 and an inner support guide body arranged on the positioning tray 130; wherein the inner support guide body is a tubular structure with a cylindrical through hole 111 inside; the positioning tray 130 is provided with a positioning outer ring 131 protruding upward and arranged around the outer periphery of the inner support guide body; a space for accommodating the bottom of the stator 20 is formed between the positioning outer ring 131 and the positioning tray 130 annular groove 133; the shrink sleeve base 200 includes a guide shaft 210, a pad ring 220, and a positioning chassis 230; wherein, a guide shaft 210 is provided in the middle of the positioning chassis 230 and is fitted with the cylindrical through hole 111; a limiting structure is provided on the positioning chassis 230, so that the pad ring 220 can be detachably installed on the positioning chassis 230 through the limiting structure, and the limiting structure limits the movement of the pad ring 220 at the positioning chassis 230.

[0040] Optionally, the limiting structure is an inner ring boss 231; the positioning chassis 230 is provided with an inner ring boss 231 arranged around the outer periphery of the guide shaft 210, and the inner ring boss 231 is fitted and matched with the raising ring 220, and the raising ring 220 is detachably fitted on the inner ring boss 231 (that is, the inner ring surface of the raising ring 220 is clamped against the outer peripheral wall surface of the inner ring boss 231).

[0041] Specifically, the heat-coating steps are:

[0042] According to the motor model, a cushioning ring 220 of appropriate height is selected and inserted into the inner ring boss 231 of the positioning chassis 230 to position the cushioning ring 220, that is, the shrink-fit base 200 is assembled;

[0043] The cylindrical through hole 111 of the shrink sleeve upper seat 100 is inserted into the guide shaft 210 of the shrink sleeve base 200 for guidance, so that the shrink sleeve upper seat 100 is sleeved on the shrink sleeve base 200, as shown in FIG. Figure 1 and Fig.10 As shown, at this time, the positioning tray 130 is placed above the padding ring 220, and the height distance between the shrink fit upper seat 100 and the shrink fit base 200 is determined by the height of the padding ring 220. A depth gauge is used to measure whether the height H from the highest point of the positioning tray 130 to the lowest point of the upper surface of the positioning base 230 meets the requirement, so as to determine whether the depth of the stator 20 in the housing 30 during shrink fit meets the requirement. If it meets the requirement, there is no need to replace the padding ring 220, and then the shrink fit base 200 and the shrink fit upper seat 100 are separated; Figure 7 and 8 As shown, the stator 20 is placed along the inner support guide of the shrink-fit upper seat 100, and the positioning tray 130 positions and accommodates it; after the casing 30 is heated to a sufficient temperature, the casing 30 is taken out and placed in the positioning chassis 230; the shrink-fit upper seat 100 is lifted and installed along the base guide shaft 210 of the shrink-fit base 200, and the stator 20 is quickly lowered with the help of its own weight, so that the stator 20 reaches the positioning position, and the positions of the stator 20 and the casing 30 are now in place; after the casing 30 is cooled, the shrink-fit of the stator 20 and the casing 30 is completed, and the shrink-fit upper seat 100 and the shrink-fit base 200 can be taken out.

[0044] From the above steps, we can see that:

[0045] The height distance between the shrink sleeve upper seat 100 and the shrink sleeve base 200 is controlled by the height of the cushioning ring 220. The cushioning ring 220 is removable and replaceable, so different heights can be designed according to needs to match different models of motor shrink sleeves. The embodiment of the present application designs the cushioning ring 220 to cooperate with the inner ring boss 231 of the positioning base, which can be used for the cushioning of the same model with different powers and different stacking thicknesses;

[0046] The embodiment of the present application is designed to cooperate with the shrink-fit upper seat 100 and the shrink-fit base 200, wherein the guide shaft 210 and the cylindrical through hole 111 cooperate to facilitate the installation and position fixation of the shrink-fit upper seat 100 and the shrink-fit base 200; an annular groove 133 is formed between the positioning outer ring 131 and the positioning tray 130 for accommodating and positioning the stator 20, and the size of the positioning outer ring 131 can be set according to the size of the stator 20, so that the annular groove 133 just accommodates the bottom end of the stator 20, which is beneficial to the placement and positioning of the stator 20, and thus to the accurate positioning between the stator 20 and the housing 30 during shrink fitting.

[0047] In summary, the shrink-fit tool 10 provided in the present application can realize flexible adjustment of the depth position when the stator 20 and the casing 30 are shrink-fitted, and its structure is simple and compact, and the operation is convenient and simple. It is suitable for being used as a shrink-fit tool 10 with different stacking thicknesses of motors, and has wide adaptability, good versatility and strong practicality.

[0048] Optionally, the raising ring 220 is fitted and matched with the inner ring boss 231 of the positioning chassis 230, and the radius of the inner ring surface of the raising ring 220 and the radius of the outer peripheral wall surface of the inner ring boss 231 are 0.1mm, that is, the single-sided gap between the raising ring 220 and the inner ring boss 231 is 0.1mm.

[0049] Such a design not only facilitates effective positioning and limiting of the padding ring 220 , but also makes it easy to disassemble the padding ring 220 .

[0050] Optionally, with the axis of the guide shaft 210 as the center, the positioning chassis 230 is provided with the inner ring boss 231 and the outer ring boss 232 arranged around the outer circumference of the guide shaft 210 in sequence from the inside to the outside; wherein, the outer ring boss 232 is fitted and matched with the housing 30, so that when shrink-fitting, the housing 30 can be fitted on the outer ring boss 232 (that is, the inner ring surface of the stop of the housing 30 is clamped against the outer peripheral wall surface of the outer ring boss 232).

[0051] The upper surface of the positioning chassis 230 limits the downward movement of the housing 30. On this basis, an outer ring boss 232 is designed to fit and match the housing 30 to limit the left and right movement (i.e. radial movement) of the housing 30, so that it can be further accurately positioned.

[0052] Optionally, the outer ring boss 232 is fitted and matched with the inner ring of the stop of the casing 30, and the casing 30 is retracted by 0.25mm on one side (that is, the inner ring radius of the stop of the casing 30 is 0.25mm smaller than the outer wall radius of the outer ring boss 232), and the retracted height of the bottom end of the casing 30 is about 3mm.

[0053] Such a design ensures that the outer ring boss 232 and the housing 30 are relatively tight and not loose, which is beneficial to the fitting stability of the outer ring boss 232 and the outer ring boss 232. During the process of shrink-fitting the housing 30, it is necessary to observe whether the housing 30 is completely fitted in place and aligned with the plane of the positioning chassis 230.

[0054] Optionally, the inner support guide body includes a guide sleeve 110 and a guide ring 120 ; wherein the guide sleeve 110 is a tubular structure having the cylindrical through hole 111 inside, and the guide ring 120 is detachably mounted on the outer periphery of the guide sleeve 110 .

[0055] A detachable guide ring 120 is mounted on the guide sleeve 110. Since the outer diameter of the guide ring 120 can be adjusted and replaced according to the inner diameter of the metal core 21 of the stator 20 of different models of products, it can adapt to the heat-shrink fitting of stators 20 and housings 30 of different specifications and models, and has strong versatility.

[0056] Optionally, the guide sleeve 110 includes a base plate 114 and a tubular boss structure 112 arranged on the base plate 114; the tubular boss structure 112 is fitted and matched with the guide ring 120, so that when the guide ring 120 is detachably sleeved on the outer periphery of the guide sleeve 110, the bottom end surface of the guide sleeve 110 is abutted against the upper surface of the base plate 114.

[0057] The guide sleeve 110 is designed with a tubular boss structure 112 , which is beneficial to improving the installation stability of the guide ring 120 .

[0058] Optionally, the guide sleeve 110 and the guide ring 120 are assembled together with a single-sided clearance of about 0.25 mm, that is, the radius of the inner ring surface of the guide ring 120 and the radius of the outer peripheral wall surface of the guide sleeve 110 are 0.25 mm, that is, the single-sided clearance between the guide ring 120 and the guide sleeve 110 is 0.25 mm.

[0059] Such a design makes it easy to install the guide ring 120 and to remove the guide ring 120 from the guide sleeve 110 .

[0060] Optionally, the guide ring 120 and the metal core 21 of the stator 20 are shrunk by about 0.05 mm on one side, that is, the inner circle radius of the metal core 21 of the stator 20 is 0.05 mm smaller than the outer peripheral wall radius of the guide ring 120 .

[0061] Such a design is helpful to ensure that the guide ring 120 and the inner diameter of the metal core 21 of the stator 20 are relatively tightly matched and not loose.

[0062] Optionally, a plurality of clearance grooves 132 are provided along the upper end of the positioning outer ring 131, and the clearance grooves 132 are used to avoid the wire frame of the stator 20; wherein, when the stator 20 is installed at the annular groove 133, the wire frame of the stator 20 is located at the clearance grooves 132, so that the bottom end surface of the metal core 21 of the stator 20 is flatly fitted with the upper end edge of the positioning outer ring 131. Optionally, the positioning outer ring 131 is an annular outer ring, and the outer diameter of the positioning outer ring 131 is less than or equal to the outer diameter of the stator 20.

[0063] The recess 132 is designed so that the bottom end surface of the metal core 21 of the stator 20 is evenly fitted with the upper edge of the positioning outer ring 131, so that the stator 20 is more accurately and stably positioned, and it is convenient to lift the stator 20 to remove it from the shrink-fit upper seat 100. In addition, the outer diameter of the positioning tray 130 shall not be larger than the outer diameter of the stator 20 to avoid blocking the housing 30 from fitting with the outer wall of the stator.

[0064] It should be noted that the height design of the positioning tray 130 can be designed according to the minimum stack thickness of the same power.

[0065] Optionally, the inner ring annular boss 231 and the outer ring annular boss 232 are circular annular bosses, and the raising ring 220 is a circular annular structure; the axis of the inner ring annular boss 231 and the outer ring annular boss 232 are coaxial with the axis of the guide shaft 210, and the coaxiality of the axis of the inner ring annular boss 231 and the outer ring annular boss 232 with the axis of the guide shaft 210 is less than or equal to 0.02 mm.

[0066] The coaxiality is designed as above, which can improve the positioning accuracy of the stator 20 and the housing 30 during shrink-fit assembly.

[0067] Optionally, the guide shaft 210 is a cylindrical structure, and the cylindrical through hole 111 is a cylindrical through hole 111 that fits and matches therewith.

[0068] Compared with other polygonal column structures, by setting the cylindrical through hole 111 and the guide shaft 210 to be mutually compatible cylindrical shapes, it is not necessary to adjust the corresponding angles of the cylindrical through hole 111 and the guide shaft 210 so that it can be directly inserted, which is convenient for use.

[0069] Optionally, the guide shaft 210 of the shrink fit base 200 needs to be tightly matched with the guide sleeve 110 of the shrink fit upper seat 100, wherein the outer diameter of the guide shaft 210 is φD-0.02 or φD-0.04, and the inner diameter of the guide sleeve 110 is φD+0.06 or φD+0.03.

[0070] Optionally, the top of the guide sleeve 110 is provided with a hole 113 for passing and installing a traction rope;

[0071] The hole 113 is designed to facilitate the fixing of the traction rope and the guide sleeve 110 .

[0072] Optionally, the bottom end of the guide sleeve 110 is detachably fixedly connected to the positioning tray 130 via a first fastener 140; optionally, the bottom end of the guide shaft 210 is detachably fixedly connected to the positioning chassis 230 via a second fastener 240;

[0073] The detachable connection design between the guide sleeve 110 and the positioning tray 130, and the guide shaft 210 and the positioning chassis 230 facilitates adjustment and replacement of the model and size of the guide sleeve 110 and the positioning tray 130, and the guide shaft 210 and the positioning chassis 230 according to needs, thereby adapting to the heat-shrink fitting of stators 20 and housings 30 of different shapes and sizes, thereby improving the applicability and versatility of the heat-shrink fitting work.

[0074] It should be noted that in this embodiment, the first fastener 140 and the second fastener 240 are bolts. Based on the above concept, those skilled in the art may adopt other fastening connectors or fastening connection methods, including but not limited to the embodiments.

[0075] Optionally, a circular arc surface transition is used at the junction between the top end surface of the guide sleeve 110 and its side surface; optionally, a circular arc surface transition is used at the junction between the top end surface of the guide ring 120 and its side surface.

[0076] The arc surface transition design is helpful to avoid the existence of sharp surfaces on the guide sleeve 110 and the guide ring 120 to damage the stator 20 .

[0077] Optionally, the top end of the guide shaft 210 is configured as a truncated cone structure 211 .

[0078] The frustum structure 211 is provided to facilitate smooth insertion of the guide shaft 210 into the cylindrical through hole 111 , making it easy to use.

[0079] It should be noted that:

[0080] In this embodiment, the inner ring annular boss 231 and the outer ring annular boss 232 are annular bosses, the pad ring 220 is an annular structure, the positioning outer ring 131 and the annular groove formed therein are also annular structures, and the guide ring 120 is also a circular tube. Since most of the existing stators 20 on the market are annular structures, and the inner holes of the existing housings 30 are mostly cylindrical structures, the structural shapes of the various components of the tooling of this embodiment are designed in a shape adapted thereto. According to the above design concept, the shape and size of the shrink fit tooling 10 provided in this application can be adaptively adjusted according to the shape and size of the stator 20 and the housing 30 of the motor.

[0081] In addition, the present application provides an example of specific steps of applying the heat shrink fitting tool 10 provided in the above embodiment to the heat shrink fitting process:

[0082] (1) According to the motor model, select a spacer ring 220 of appropriate height and place it into the positioning chassis 230, and install it to the inner ring boss 231, and then assemble the shrink-fit base 200;

[0083] (2) The cylindrical through hole 111 of the shrink sleeve upper seat 100 is inserted into the guide shaft 210 of the shrink sleeve base 200 for guidance, so that the shrink sleeve upper seat 100 is sleeved on the shrink sleeve base 200; at this time, the positioning tray 130 is placed above the padding ring 220, and the height distance between the shrink sleeve upper seat 100 and the shrink sleeve base 200 is determined by the height of the padding ring 220. Use a depth gauge to measure whether the height distance H from the highest point of the positioning tray 130 to the lowest point on the upper surface of the positioning base 230 (i.e., the lowest point of the outer ring-shaped boss 232) meets the requirements, so as to determine whether the depth of the stator 20 in the housing 30 meets the requirements. If it meets the requirements, there is no need to replace the padding ring 220, and the shrink sleeve base 200 and the shrink sleeve upper seat 100 are separated;

[0084] (3) Figure 8As shown, the stator 20 is placed along the guide ring 120 of the shrink-fit upper seat 100, and the positioning tray 130 positions and accommodates it, ensuring that the bottom end surface of the metal core 21 of the stator 20 is aligned with the upper edge of the positioning tray 130;

[0085] (4) After the housing 30 is heated to a sufficient temperature, the housing 30 is taken out and inserted into the outer ring-shaped boss 232 of the positioning chassis 230, and the positioning chassis 230 limits it. At this time, it is necessary to ensure that the bottom end surface of the housing 30 is flush with the upper surface of the positioning chassis 230, and the stopper at the bottom end of the housing 30 is ensured to fit with the outer ring-shaped boss 232.

[0086] (5) Lift the shrink fit upper seat 100 and insert it along the guide shaft 210 of the shrink fit base 200, and quickly lower it with the help of the weight of the stator 20 itself, so that the stator 20 reaches the positioning position. At this time, the positions of the stator 20 and the housing 30 are in place and positioned; if there is any jamming, lift it up and put it in again;

[0087] (6) A cooler is directed toward the housing 30 to accelerate cooling. When the surface temperature of the housing 30 is measured by a temperature measuring gun and drops below 70° C., the shrink sleeve upper seat 100 and the shrink sleeve base 200 can be removed.

[0088] (7) Use a depth gauge to measure the distance between the metal core 21 of the stator 20 and the end surface of the housing 30 at the non-lead-out end.

[0089] Based on the above, it can be known that the present application achieves the high-precision coaxiality and depth requirements of the shrink fit between the stator 20 and the housing 30, and the shrink fit tool 10 provided by the present application has a simple and compact structure, simple and convenient operation, and can be used for shrink fit tool 10 of motors with different stacking thicknesses. It has good applicability and strong versatility, and is conducive to improving the quality of motor products.

[0090] Although the terms such as stator 20, housing 30 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A motor stator shrink fit tool, characterized by: It comprises a heat-shrink sleeve upper seat (100) and a heat-shrink sleeve base (200); The shrink fit upper seat (100) comprises a positioning tray (130) and an inner support guide body arranged on the positioning tray (130); The inner support guide body is a tubular structure having a cylindrical through hole (111) inside; the positioning tray (130) is provided with a positioning outer ring (131) protruding upward and arranged around the outer periphery of the inner support guide body; an annular groove for accommodating the bottom of the stator (20) is formed between the positioning outer ring (131) and the positioning tray (130); The shrink-fit base (200) comprises a guide shaft (210), a cushioning ring (220), and a positioning base plate (230); A guide shaft (210) which is fitted and matched with the cylindrical through hole (111) is provided in the middle of the positioning chassis (230); a limiting structure is provided on the positioning chassis (230), so that the padding ring (220) can be detachably mounted on the positioning chassis (230) through the limiting structure, and the limiting structure limits the movement of the padding ring (220) on the positioning chassis (230).

2. The motor stator shrink fit tooling according to claim 1, characterized in that: The limiting structure is an inner ring-shaped boss (231); The positioning chassis (230) is provided with an inner ring-shaped boss (231) arranged around the outer circumference of the guide shaft (210), and the inner ring-shaped boss (231) is matched with the padding ring (220), and the padding ring (220) is detachably sleeved on the inner ring-shaped boss (231).

3. The motor stator shrink fit tooling according to claim 2, characterized in that: With the axis of the guide shaft (210) as the center, the positioning chassis (230) is provided with an inner ring-shaped boss (231) and an outer ring-shaped boss (232) arranged around the outer circumference of the guide shaft (210) in sequence from the inside to the outside; The outer ring-shaped boss (232) is fitted and matched with the housing (30), so that the housing (30) can be fitted onto the outer ring-shaped boss (232) during shrink fitting.

4. The motor stator shrink fit tooling according to claim 1, characterized in that: The inner support guide body comprises a guide sleeve (110) and a guide ring (120); The guide sleeve (110) is a tubular structure having the cylindrical through hole (111) inside, and the guide ring (120) is detachably sleeved on the outer periphery of the guide sleeve (110).

5. The motor stator shrink fit tooling according to claim 4, characterized in that: The guide sleeve (110) comprises a bottom plate (114) and a tubular boss structure (112) arranged on the bottom plate (114); The tubular boss structure (112) is fitted and matched with the guide ring (120) so that when the guide ring (120) is detachably sleeved on the outer periphery of the guide sleeve (110), the bottom end surface of the guide sleeve (110) abuts against the upper surface of the bottom plate (114).

6. The motor stator shrink fit tooling according to claim 1, characterized in that: The positioning outer ring (131) is a circular outer ring, and the outer diameter of the positioning outer ring (131) is less than or equal to the outer diameter of the stator (20).

7. The motor stator shrink fit tooling according to claim 1, characterized in that: A plurality of clearance grooves (132) are provided along the edge of the upper end of the positioning outer ring (131), and the clearance grooves (132) are used to avoid the wire rack of the stator (20); When the stator (20) is installed in the annular groove, the wire frame of the stator (20) is located in the clearance groove (132), so that the bottom end surface of the metal core of the stator (20) is evenly fitted with the upper edge of the positioning outer ring (131).

8. The motor stator shrink fit tooling according to claim 1, characterized in that: The guide shaft (210) is a cylindrical structure, and the cylindrical through hole (111) is a cylindrical through hole (111) that fits and matches the guide shaft (210).

9. The motor stator shrink fit tooling according to claim 3, characterized in that: The inner ring-shaped boss (231) and the outer ring-shaped boss (232) are circular ring-shaped bosses, and the padding ring (220) is a circular ring-shaped structure; The axes of the inner ring boss (231) and the outer ring boss (232) are coaxial with the axis of the guide shaft (210), and the coaxiality of the axes of the inner ring boss (231) and the outer ring boss (232) with the axis of the guide shaft (210) is less than or equal to 0.02 mm.

10. The motor stator shrink fit tooling according to claim 4, characterized in that: The top end of the guide sleeve (110) is provided with a hole (113) for inserting and installing a traction rope; And / or, the bottom end of the guide sleeve (110) is detachably fixedly connected to the positioning tray (130) via a first fastener (140); And / or, the junction between the top end surface of the guide sleeve (110) and its side surface adopts an arc surface transition; And / or, the junction between the top surface of the guide ring (120) and its side surface adopts an arc surface transition; And / or, the bottom end of the guide shaft (210) is detachably fixedly connected to the positioning chassis (230) via a second fastener (240); And / or, the top end of the guide shaft (210) is configured as a truncated cone structure (211).

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