A tooling fixture specially used for turning the stopper of the motor stator housing

Abstract

A tooling fixture specially used for machining the stop of a motor stator housing, the tooling fixture comprises a core rod, a radial locking mechanism, an expansion sleeve and a fixed seat. The core rod is a rotating body, the front end of the core rod along its axis is a first cone, the rear end is a second cone, and the two cones are coaxially arranged opposite to each other. The radial locking mechanism is sleeved on the outer circumference of the first cone, and the locking blocks are evenly arranged along the circumferential direction to define a first cone hole; the first cone hole is aligned with the first cone surface of the first cone. The expansion sleeve is sleeved on the outer circumference of the second cone in the core rod. The core rod also includes a middle section, which is located between the first cone and the second cone; a through hole is provided on the fixed seat, the middle section of the core rod is inserted into the through hole, and the rear end face of the fixed seat is in contact with the front end face of the expansion sleeve. The present invention can effectively solve the problems of poor processing accuracy, low reliability and low production efficiency in the prior art.

Description

Technical Field

[0001] The invention relates to the field of machining, and in particular to a tooling fixture specially used for machining a stopper of a motor stator casing. Background Art

[0002] In recent years, with the rapid development of motor technology, people have higher and higher requirements for the quality of motors. As we all know, the stator and the rotor are the main components of the motor. The stator is equipped with end covers at both ends. The bearings on the end covers match the rotor shaft to make the rotor rotate inside the stator. However, only when the rotor and the stator core are coaxial can the gap between the two be uniform, thus ensuring that the motor has better performance. In order to ensure this coaxiality, the stoppers at both ends of the stator housing are usually processed on special machine tools. The coaxiality between the inner diameter of the stator core and the stoppers at both ends will directly affect the performance of the motor. Therefore, turning the stoppers of the motor stator housing has become a necessary finishing process in motor processing.

[0003] However, there are still certain drawbacks in the prior art. First, the non-expansion sleeve stopper tooling is currently more commonly used. This type of tooling is suitable for casing processing before inserting the core winding. However, the stator is usually made of a stator casing and a stator core that are heat-fitted with an interference fit. It is easy to deform during the sleeve connection and cooling process, which will directly affect the coaxiality. At the same time, the non-expansion sleeve stopper tooling is mostly suitable for single-end processing that requires secondary clamping, that is, the stator is first fixed to process the stopper at one end, and then the stator is disassembled and turned around to clamp before processing the stopper at the other end. The secondary clamping is bound to affect the coaxiality of the stoppers at both ends of the stator and the verticality of the inner hole and the end face.

[0004] Therefore, the above-mentioned prior art is far from being able to ensure the coaxiality between the inner diameter of the stator core and the ends of the stoppers, resulting in poor motor performance, loud noise and obvious vibration during operation, and directly causing serious bearing wear, affecting the bearing life and low reliability. In addition, the prior art has low production efficiency and is time-consuming and labor-intensive.

[0005] In view of this, how to design a tooling fixture specifically used for machining the stopper of the motor stator housing to overcome the shortcomings of the above-mentioned prior art is the research topic of the present invention. Summary of the invention

[0006] The invention provides a tooling fixture specially used for machining the stopper of a motor stator housing, and aims to solve the problems of poor machining accuracy, low reliability and low production efficiency in the prior art.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a tooling fixture specially used for turning the stopper of the stator casing of a motor, the stator including the stator casing, the stator core and the stator winding; its innovation lies in: the tooling fixture includes a core rod, a radial locking mechanism, an expansion sleeve and a fixed seat, wherein the radial locking mechanism and the fixed seat are positioned and connected to the machine tool, and are both arranged corresponding to the front end of the core rod.

[0008] The core rod is a rotating body, and the front end of the core rod along its axis is a first frustum, and the rear end is a second frustum, the two frustums are coaxially arranged, and the lower bases of the two frustums are opposite to each other; wherein the taper of the first frustum is greater than the taper of the second frustum; the circumferential side surface of the first frustum is a first conical surface, and the circumferential side surface of the second frustum is a second conical surface.

[0009] The radial locking mechanism is sleeved on the outer circumference of the first cone in the core rod, and the radial locking mechanism is composed of at least three locking blocks; each locking block is evenly arranged along the circumferential direction of the core rod axis, thereby defining a first conical hole in the center of the radial locking mechanism; the first conical hole is aligned with the first conical surface of the first cone.

[0010] The expansion sleeve is arranged on the outer periphery of the second cone in the core rod; the expansion sleeve is composed of at least three expansion blocks; each expansion block is evenly arranged at equal angles along the circumferential direction of the core rod axis, thereby defining a second tapered hole in the center of the expansion sleeve, and the second tapered hole is aligned with the second tapered surface of the second cone.

[0011] The radial locking mechanism is driven by a driving mechanism to cause each of the locking blocks to generate radial displacements inward and outward, thereby forming two states of contraction and expansion of the first tapered hole; in the contracted state of the first tapered hole, the inner side surface of the first tapered hole adheres to and squeezes the first tapered surface of the first cone, thereby driving the core rod to move forward; the second tapered surface of the second cone adheres to and squeezes the inner side surface of the second tapered hole in the expansion sleeve, thereby driving each of the expansion blocks to make radial displacements outward through the forward displacement of the core rod, thereby achieving a radial interference fit between the expansion sleeve and the stator, thereby positioning the stator in the axial direction.

[0012] The relevant contents in the above technical solution are explained as follows:

[0013] 1. In this solution, the stoppers are located at the front and rear ends of the stator housing.

[0014] 2. In this proposal, in the phrase “the lower bases of the first cone and the second cone are facing each other”, the definition of “lower base” is standard, i.e. the base with a larger radius in the cone, and does not refer to the base in the up-down direction in this proposal; “facing each other” means that the lower base of the first cone faces forward, and the lower base of the second cone faces backward. The “two cones are coaxially arranged” means that the geometric centers of the upper and lower bases of the two cones are on the same straight line.

[0015] 3. In this solution, the radial locking mechanism is sleeved on the outer circumference of the first cone in the mandrel, and in a non-working state, the two are clearance-matched.

[0016] 4. In this solution, preferably, the middle section of the mandrel is a cylinder, so as to facilitate the matching between the sets, reduce wear, and improve the coaxiality of the stopper processing.

[0017] 5. In this solution, the mandrel further includes a middle section, which is located between the first frustum and the second frustum; the fixing seat is provided with a through hole, the middle section of the mandrel is inserted into the through hole, and the rear end surface of the fixing seat is in contact with the front end surface of the expansion sleeve; the through hole is composed of a clamping hole located in the front section and an avoidance hole located in the rear section, and the two are connected in the axial direction; wherein the aperture of the clamping hole corresponds to the diameter of the middle section of the mandrel, and the aperture of the avoidance hole is larger than the diameter of the middle section of the mandrel.

[0018] 6. In this solution, as a preferred embodiment, adjacent expansion blocks are connected by glue at the gap. The glue connection at the gap helps to stabilize the elasticity of the expansion sleeve, thereby improving the accuracy and consistency of the stopper processing.

[0019] 7. In this solution, it is further preferred that the front end of each expansion block is fixedly connected to the front end of the expansion block adjacent to one side of the expansion block in the circumferential direction, and the rear end is fixedly connected to the rear end of the expansion block adjacent to the other side of the expansion block in the circumferential direction, so that the expansion sleeve is formed in a folded structure. Adjacent expansion blocks are connected by glue at the gap between them. The folded structure of the expansion sleeve and the glue connection at the gap help stabilize the elasticity of the expansion sleeve, thereby helping to improve the accuracy and consistency of the stopper processing.

[0020] 8. In this scheme, as a preference, it further includes a tailstock, one end of which is a fixed convex end in the axial direction; for the fixed convex end, a fixed groove is provided on the rear end surface of the mandrel; in the contracted state of the first tapered hole, the tailstock is positioned on the machine tool, and the fixed convex end and the fixed groove are engaged with each other. This structure is used to support the mandrel so that the mandrel and the through hole are coaxially arranged.

[0021] 9. In this scheme, as a preference, it further includes a second protective cover, which includes a circumferential ring and a radial ring, the outer edge of the radial ring is fixedly connected to one end of the circumferential ring along the axial direction; in the assembled state, the second protective cover is sleeved on the core rod, and the radial ring is attached between the stator and the fixed seat, and the circumferential ring is attached to the inner wall of the front end of the stator. This structure is used to assist axial positioning and prevent metal chips from contaminating the stator.

[0022] 10. In this scheme, as a preference, it further includes a first protective cover, which includes a protective plate and a side ring fixedly connected to the periphery of the protective plate; the protective plate is provided with a tailstock sleeve hole, and the first protective cover is sleeved through the tailstock sleeve hole and positioned on the tailstock; in the assembled state, the protective plate and the tailstock jointly cover the rear end surface of the stator, and the side ring is attached to the inner wall of the rear end of the stator housing. This structure is used to prevent metal chips from contaminating the stator.

[0023] 11. In this scheme, as a preference, it also includes a movable positioning block; in the assembled state, before the radial locking mechanism is in the contracted state, the front end face of the positioning block is in contact with the fixing seat, and the rear end face of the positioning block is in contact with the front end face of the stator; when the radial locking mechanism is in the contracted state, the positioning block is removed. The purpose of placing the positioning block is to limit the axial position of the stator and improve the accuracy and consistency of the stop processing; removing the positioning block is to facilitate the stop processing. Further preferably, the material of the positioning block is a magnetic material.

[0024] 12. In this solution, preferably, the avoidance hole is a tapered hole, and the front end diameter of the tapered hole is smaller than the rear end diameter.

[0025] The design principle and beneficial effects of the present invention are:

[0026] The main principle of the present invention is that, driven by a driving mechanism arranged on a machine tool, the first tapered hole of the radial locking mechanism has two states in the radial direction, namely, contraction and opening. In the contracted state of the first tapered hole, the inward radial displacement of the locking block drives the core rod to produce a forward axial displacement, and the axial displacement in turn drives the expansion block of the expansion sleeve to produce an outward radial displacement, so that the expansion sleeve and the stator sleeved thereon have an interference fit, thereby realizing the positioning of the stator. In the open state of the first tapered hole, the expansion sleeve contracts due to deformation recovery, and the contraction drives the core rod to produce a backward axial displacement, thereby causing the core rod to move backward to the axial position before the contracted state.

[0027] The present invention can effectively solve the problems of poor processing accuracy, low reliability and low production efficiency in the prior art.

[0028] First, the technical solution can realize the processing of the stoppers at both ends of the stator through one clamping, and the operation is carried out after the stator housing, the core and the winding are sleeved, which improves the coaxial processing accuracy, reliability and production efficiency compared with the prior art, and solves the basic problems of the prior art. Secondly, by setting the first cone and the second cone on the core rod, and coordinating with the radial locking mechanism and the expansion sleeve, the three-step linkage from radial displacement to axial displacement and then to radial displacement can be realized. Compared with the conventional expansion sleeve technology in which the driving device directly drives the core rod from axial displacement to radial displacement, the stability and reliability of the linkage can be significantly improved, thereby effectively improving the coaxiality of the stopper; at the same time, the above three-step linkage is combined with the pulling design, which is more stable and reliable and more accurate than the conventional pushing design. Third, the return structure of the expansion sleeve and the adhesive connection at the gap help to stabilize the elasticity of the expansion sleeve; the setting of the positioning block ensures the accuracy of axial positioning. Both are conducive to improving the accuracy of stopper processing and the consistency of product quality. Fourth, the machine tool is provided with a tailstock to support the mandrel during processing, which not only helps to keep the mandrel and the through hole coaxially arranged, but also helps to reduce vibration, thereby increasing the life of the tooling.

[0029] In addition, by combining the setting of the first protective cover and the second protective cover, it is also possible to effectively prevent metal chips generated during the processing from contaminating the stator, which is beneficial to the process quality control of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the fixture equipped with the motor stator in the present invention;

[0031] Attached Figure 2 It is an axial cross-sectional view of the first tapered hole in the present invention when it is in an open state;

[0032] Attached Figure 3 It is an axial cross-sectional view of the first tapered hole in the present invention when the stopper is processed in the contracted state;

[0033] Attached Figure 4 It is a schematic diagram of the three-dimensional structure of the fixture in the present invention;

[0034] Attached Figure 5 for Figure 4 Axial cross-sectional view of

[0035] Attached Figure 6 It is a schematic diagram of the three-dimensional structure of the core rod in the present invention;

[0036] Attached Figure 7 for Figure 6 Front view of the core rod;

[0037] Attached Figure 8 It is a schematic diagram of the three-dimensional structure of the fixing seat in the present invention;

[0038] Attached Fig. 9 for Figure 8 Axial cross-sectional view of

[0039] Attached Fig.10 It is a three-dimensional structural schematic diagram of the radial locking mechanism in the present invention;

[0040] Attached Fig.11 for Fig.10 Right view of;

[0041] Attached Fig.12 for Fig.10 Axial cross-sectional view of

[0042] Attached Fig.13 It is a schematic diagram of the three-dimensional structure of the expansion sleeve in the present invention;

[0043] Attached Fig.14 It is a left side view of the expansion sleeve in the present invention;

[0044] Attached Fig.15 It is an axial cross-sectional view of the expansion sleeve in the present invention;

[0045] Attached Fig.16 It is a schematic diagram of the three-dimensional structure of an expansion sleeve in another embodiment of the present invention;

[0046] Attached Fig.17 for Fig.16 Axial cross-sectional view of

[0047] Attached Fig.18 It is a schematic diagram of the three-dimensional structure of the tailstock in the present invention;

[0048] Attached Fig.19 It is a schematic diagram of the three-dimensional structure of two positioning blocks in the present invention;

[0049] Attached Fig. 20 is a schematic diagram of the three-dimensional structure of the first protective cover in the present invention;

[0050] Attached Fig.21 for Fig. 20 Axial cross-sectional view of

[0051] Attached Fig. 22 is a schematic diagram of the three-dimensional structure of the second protective cover in the present invention;

[0052] Attached Fig.23 is an axial cross-sectional view of 22;

[0053] Attached Fig.24 is a schematic diagram of the three-dimensional structure of a stator in an embodiment of the present invention;

[0054] Attached Fig.25 24 is an axial cross-sectional view.

[0055] In the above drawings: 1. mandrel; 101. first conical surface; 102. second conical surface; 103. fixing groove; 2. radial locking mechanism; 201. locking block; 202. first conical hole; 3. expansion sleeve; 301. expansion block; 302. second conical hole; 303. return structure; 3031. process hole; 4. fixing seat; 401. through hole; 4011. clamping hole; 4012. avoidance hole; 5. tailstock; 501. fixing protrusion; 6. positioning block; 7. first protective cover; 701. protective plate; 7011. tailstock sleeve hole; 702. side ring; 8. second protective cover; 801. circumferential ring; 802. radial ring; 9. stator; 901. stator housing; 9011. stopper; 902. Stator core. DETAILED DESCRIPTION

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0057] Embodiment: A fixture specifically used for turning the stopper of a motor stator housing

[0058] Please refer to Figures 1 to 3 as well as Fig.24 , Fig.25 As shown, a fixture specially used for turning the stopper of the stator housing of a motor, the stator 9 includes the stator housing 901, the stator core 902 and the stator winding. The fixture includes a core rod 1, a radial locking mechanism 2, an expansion sleeve 3 and a fixing seat 4, wherein the radial locking mechanism 2 and the fixing seat 4 are connected to the machine tool for positioning, and are both arranged corresponding to one end of the core rod 1. It should be noted that in the present invention, this end of the core rod 1 is defined as the front end, and the other end is defined as the rear end, and the front and rear directions described later are defined in sequence along the axial front and rear directions. In addition, as specifically Fig.25 As shown, in this embodiment, there are two stops 9011, which are located at the front end and the rear end of the stator housing respectively, and are in the shape of steps around the circumference.

[0059] Combination Figure 6 and Figure 7 As shown, the mandrel 1 is a rotating body, and the front end of the mandrel 1 along its axis is a first cone, and the rear end is a second cone. In this embodiment, the two cones are two circular cones. The two cones are coaxially arranged, and the lower bottom surfaces of the two cones are opposite to each other. Among them, the taper of the first cone is greater than the taper of the second cone; the peripheral side surface of the first cone is a first cone surface 101, and the peripheral side surface of the second cone is a second cone surface 102. In this embodiment, the first cone surface 101 and the second cone surface 102 are rotation surfaces.

[0060] Combination Figure 1 and Figure 2 As shown, the radial locking mechanism 2 is sleeved on the outer periphery of the first cone in the core rod 1, and the two are clearance-matched in a non-working state. Figures 10 to 12 As shown, the radial locking mechanism 2 is composed of six locking blocks 201; each of the locking blocks 201 is evenly arranged along the circumferential direction of the core rod axis, thereby defining a first tapered hole 202 at the center of the radial locking mechanism 2; the first tapered hole 202 is aligned with the first tapered surface 101 of the first cone.

[0061] Combination Figure 4 and Figure 5 As shown, the expansion sleeve 3 is sleeved on the outer periphery of the second cone in the mandrel 1; Figures 13 to 15 As shown, the expansion sleeve 3 is composed of twelve expansion blocks 301; each expansion block 301 is evenly arranged at equal angles along the circumferential direction of the mandrel axis, so as to define a second tapered hole 302 at the center of the expansion sleeve 3, and the second tapered hole 302 is aligned with the second tapered surface 102 of the second cone. Adjacent expansion blocks 301 are connected by adhesive at the gap between them. The adhesive connection at the gap helps to stabilize the elasticity of the expansion sleeve 3, thereby helping to improve the accuracy and consistency of the processing of the stopper 9011.

[0062] Combination Figure 6 and Figure 7 As shown, the core rod 1 also includes a cylindrical middle section, which is located between the first frustum and the second frustum; Figure 5 and Figure 8 As shown, the fixing seat 4 is provided with a through hole 401, the middle section of the core rod 1 is passed through the through hole 401, and the rear end surface of the fixing seat 4 is in contact with the front end surface of the expansion sleeve 3; Figure 8 and Fig. 9 As shown, the through hole 401 is composed of a clamping hole 4011 located at the front section and a relief hole 4012 located at the rear section, and the two are connected in the axial direction; wherein the aperture of the clamping hole 4011 corresponds to the diameter of the middle section of the mandrel 1, and has a supporting effect on the mandrel 1 through clamping and positioning. The aperture of the relief hole 4012 is larger than the diameter of the middle section of the mandrel 1, and is used to allow the axial displacement of the mandrel 1. In this embodiment, the relief hole 4012 is a tapered hole, and the front aperture of the tapered hole is smaller than the rear aperture.

[0063] Combination Figure 2 and Figure 3 As shown, the radial locking mechanism 2 is driven by a hydraulic cylinder disposed on the machine tool to cause each locking block 201 to produce radial displacement inward and outward, thereby forming two states of contraction and expansion of the first tapered hole 202; Figure 2 It is an axial cross-sectional view of the first tapered hole in the open state. When the first tapered hole 202 is in the open state, there is a gap between two adjacent locking blocks 201, and the gap decreases as the first tapered hole 202 shrinks; the radial locking mechanism 2 is gap-matched with the first tapered surface 101 of the core rod 1.

[0064] Figure 3 It is an axial cross-sectional view of the first tapered hole in the contracted state; in the contracted state of the first tapered hole 202, the inner side surface of the first tapered hole 202 fits and squeezes the first tapered surface 101 of the first cone, thereby driving the core rod 1 to move forward; the second tapered surface 102 of the second cone fits and squeezes the inner side surface of the second tapered hole 302 in the expansion sleeve 3, thereby driving each expansion block 301 to make an outward radial displacement through the forward displacement of the core rod 1, so that the expansion sleeve 3 and the stator 9 achieve a radial interference fit, thereby positioning the stator 9 in the axial direction, thereby ensuring the stability of the stator 9 when processing the stop 9011.

[0065] Combination Fig.18 As shown, the fixture also includes a tailstock 5, one end of which is a fixed protruding end 501 in the axial direction; a fixed groove 103 is formed on the rear end surface of the mandrel 1 for the fixed protruding end 501; Figure 3 As shown, in the contracted state of the first tapered hole 202, the tailstock 5 is positioned on the machine tool, and the fixed protrusion 501 is engaged with the fixed groove 103. The tailstock 5 is used to support the core rod 1 so that the core rod 1 and the through hole 401 are coaxially arranged.

[0066] Combination Fig. 20 and Fig.21 As shown, the fixture also includes a first protective cover 7 to prevent metal chips from contaminating the stator. The first protective cover 7 includes a protective plate 701 and a side ring 702 fixedly connected to the periphery of the protective plate 701; the protective plate 701 is provided with a tailstock sleeve hole 7011, and the first protective cover 7 is sleeved and positioned on the tailstock 5 through the tailstock sleeve hole 7011; Figure 3 As shown, in the assembled state, the protective plate 701 and the tailstock 5 jointly cover the rear end surface of the stator 9 , and the side ring 702 is attached to the inner wall of the rear end of the stator housing 901 .

[0067] like Fig. 22 and Fig.23 As shown, the fixture also includes a second protective cover 8, which is used to assist in axial positioning and prevent metal chips from contaminating the stator. It includes a circumferential ring 801 and a radial ring 802. The outer edge of the radial ring 802 is fixedly connected to one end of the circumferential ring 801 along the axial direction; Figure 1 and Figure 2 As shown, in the assembled state, the second protective cover 8 is sleeved on the core rod 1, and the radial ring 802 is attached between the stator 9 and the fixing seat 4, and the circumferential ring 801 is attached to the inner wall of the front end of the stator 9.

[0068] like Fig.19As shown, the fixture also includes two movable positioning blocks 6. In the assembled state, before the first tapered hole 202 is in the contracted state, as shown in FIG. Figure 2 As shown, the front end surface of the positioning block 6 fits the fixing seat 4, and the rear end surface of the positioning block 6 fits the front end surface of the stator 9; Figure 3 As shown, when the first tapered hole 202 is in a contracted state, before the stopper 9011 is processed, the positioning block 6 is removed. The purpose of placing the positioning block 6 is to limit the axial position of the stator 9 and improve the accuracy and consistency of the processing of the stopper 9011; the positioning block 6 is removed to facilitate the processing of the stopper 9011. In this embodiment, the material of the positioning block 6 is a magnetic material.

[0069] It should be pointed out that the axial positioning of the stator can also be achieved by using a driving mechanism such as a hydraulic jack to directly push the core rod to produce axial displacement, but its effect is far inferior to that of the present invention. Because in the present invention, the first tapered hole of the radial locking mechanism is radially contracted to pull the core rod for axial displacement. First, the force-bearing mode is different, and this structure has higher displacement accuracy and higher coaxiality. Secondly, since the taper of the first cone is greater than the taper of the second cone, that is, the present invention adopts a labor-saving structure, which reduces the power requirements and helps to save energy and reduce consumption.

[0070] like Figure 2 and Figure 3 As shown in the figure, during the transition from the open state to the contracted state of the first tapered hole, the radial displacement of the expansion block is H2-H1, and the radial displacement is associated with the axial displacement of the core rod. It should be noted that in the embodiment, the axial displacement of the core rod 1 is only 0.1 mm. Figure 2 and Figure 3 The radial displacement and axial displacement shown are exaggerated for the purpose of illustrating the problem clearly and are for illustration only.

[0071] The following is an explanation of other implementations and structural changes of the present invention:

[0072] 1. In the above embodiments, the radial locking mechanism uses a hydraulic cylinder as a driving mechanism, but the driving mechanism configured for the radial locking mechanism of the present invention is not limited thereto, and the driving mechanism may also be a driving mechanism such as a cylinder, which is easily understood and accepted by those skilled in the art.

[0073] 2. In the above embodiments, the shape of the mandrel is a rotating body, including two frustums and a cylinder. However, other suitable shapes can also basically achieve the linkage function, such as replacing it with a prism or a frustum with an elliptical cross section, or replacing the cylinder with a column with a polygonal or elliptical cross section. However, in this replacement case, due to the poor fit between the kits, the poor coaxiality and large wear in the matching process will directly affect the coaxiality of the stop processing, and the significant effect of the present invention cannot be achieved. This is easy for those skilled in the art to understand and accept.

[0074] 3. In the above embodiments, the positioning block is a T-shaped magnetic material positioning block, and the number is two, but the present invention is not limited to this. The positioning block shape, known material and number that can achieve the stator axial positioning function all fall within the protection scope of the present invention, which is easily understood and accepted by those skilled in the art.

[0075] 4. In the above embodiments, the number of expansion blocks in the expansion sleeve is twelve, but the present invention is not limited thereto. Any related technical solution that satisfies the condition that the number of expansion blocks is at least three should fall within the protection scope of the present invention, which is easily understood and accepted by those skilled in the art.

[0076] 5. In the above embodiment, the number of locking blocks in the radial locking mechanism is six, but the present invention is not limited thereto. All related technical solutions with at least three locking blocks should fall within the protection scope of the present invention, which is easily understood and accepted by those skilled in the art.

[0077] 6. In the above embodiments, each expansion block is independent of each other, and adjacent expansion blocks are connected by adhesive at the gap between them to form an expansion sleeve. However, the present invention is not limited to this. Fig.16 and Fig.17 As shown, the present invention can also use an expansion sleeve with a folding structure, in which the front end of each expansion block is fixedly connected to the front end of the expansion block adjacent to one side of the expansion block in the circumferential direction, and the rear end is fixedly connected to the rear end of the expansion block adjacent to the other side of the expansion block in the circumferential direction, and the adjacent expansion blocks 301 are connected by adhesive at the gap between them. This is easily understood and accepted by those skilled in the art.

[0078] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixture specially used for machining the stopper of a motor stator housing, wherein the stator (9) comprises the stator housing (901), a stator core (902) and a stator winding; characterized in that: The fixture comprises a core rod (1), a radial locking mechanism (2), an expansion sleeve (3) and a fixing seat (4), wherein the radial locking mechanism (2) and the fixing seat (4) are connected to the machine tool for positioning and are both arranged corresponding to the front end of the core rod (1); The front end of the mandrel (1) along its axis is a first cone, and the rear end is a second cone, the two cones are coaxially arranged, and the lower bottom surfaces of the two cones are opposite to each other; wherein the taper of the first cone is greater than the taper of the second cone; the peripheral side surface of the first cone is a first cone surface (101), and the peripheral side surface of the second cone is a second cone surface (102); The radial locking mechanism (2) is sleeved on the outer circumference of the first cone in the mandrel (1), and the radial locking mechanism (2) is composed of at least three locking blocks (201); the locking blocks (201) are evenly arranged along the circumferential direction of the mandrel axis, so that a first tapered hole (202) is defined at the center of the radial locking mechanism (2); the first tapered hole (202) is aligned with the first tapered surface (101) of the first cone; The expansion sleeve (3) is sleeved on the outer circumference of the second cone in the mandrel (1); the expansion sleeve (3) is composed of at least three expansion blocks (301); the expansion blocks (301) are evenly arranged at equal angles along the circumferential direction of the mandrel axis, so as to define a second tapered hole (302) at the center of the expansion sleeve (3), and the second tapered hole (302) is aligned with the second tapered surface (102) of the second cone; The radial locking mechanism (2) is driven by a driving mechanism to cause each of the locking blocks (201) to generate radial displacement inwards and outwards, thereby forming two states of contraction and expansion of the first tapered hole (202); in the contracted state of the first tapered hole (202), the inner side surface of the first tapered hole (202) abuts against and squeezes the first tapered surface (101) of the first cone, thereby driving the core rod (1) to move forward; the second tapered surface (102) of the second cone abuts against and squeezes the inner side surface of the second tapered hole (302) in the expansion sleeve (3), thereby driving each of the expansion blocks (301) to make radial displacement outwards through the forward displacement of the core rod (1), thereby achieving a radial interference fit between the expansion sleeve (3) and the stator (9), thereby positioning the stator (9) in the axial direction.

2. The fixture according to claim 1, characterized in that: The core rod (1) further comprises a middle section, which is located between the first frustum and the second frustum; a through hole (401) is provided on the fixing seat (4), the middle section of the core rod (1) is inserted into the through hole (401), and the rear end face of the fixing seat (4) is in contact with the front end face of the expansion sleeve (3); the through hole (401) is composed of a clamping hole (4011) located at the front section and an avoidance hole (4012) located at the rear section, and the two are connected in the axial direction; wherein the aperture of the clamping hole (4011) corresponds to the diameter of the middle section of the core rod (1), and the aperture of the avoidance hole (4012) is larger than the diameter of the middle section of the core rod (1).

3. The fixture according to claim 2, characterized in that: The middle section of the core rod (1) is a cylinder.

4. The fixture according to claim 1, characterized in that: The invention also comprises a tailstock (5), wherein one axial end of the tailstock (5) is a fixed protrusion (501); a fixed groove (103) is provided on the rear end surface of the mandrel (1) for the fixed protrusion (501); when the first tapered hole (202) is contracted, the tailstock (5) is positioned on the machine tool, and the fixed protrusion (501) and the fixed groove (103) are engaged with each other.

5. The fixture according to claim 4, characterized in that: The invention also comprises a first protective cover (7), the first protective cover (7) comprising a protective plate (701) and a side ring (702) fixedly connected to the periphery of the protective plate (701); a tailstock sleeve hole (7011) is provided on the protective plate (701), and the first protective cover (7) is sleeved and positioned on the tailstock (5) through the tailstock sleeve hole (7011); in an assembled state, the protective plate (701) and the tailstock (5) jointly cover the rear end surface of the stator (9), and the side ring (702) is attached to the inner wall of the rear end of the stator housing (901).

6. The fixture according to claim 1, characterized in that: The second protective cover (8) further comprises a circumferential ring (801) and a radial ring (802), wherein the outer edge of the radial ring (802) is fixedly connected to one end of the circumferential ring (801) along the axial direction; in an assembled state, the second protective cover (8) is sleeved on the core rod (1), and the radial ring (802) is fitted between the stator (9) and the fixing seat (4), and the circumferential ring (801) is fitted on the inner wall of the front end of the stator (9).

7. The fixture according to claim 1, characterized in that: The front end of each expansion block (301) is fixedly connected to the front end of an expansion block (301) adjacent to the expansion block (301) along one side of the circumferential direction, while the rear end is fixedly connected to the rear end of an expansion block (301) adjacent to the expansion block (301) along the other side of the circumferential direction, that is, the expansion sleeve (3) is formed in a folded structure (303).

8. The fixture according to claim 1 or 7, characterized in that: Adjacent expansion blocks (301) are glued together at the gaps therebetween.

9. The fixture according to claim 1, characterized in that: It also includes a movably arranged positioning block (6); in the assembled state, before the radial locking mechanism (2) is in the contracted state, the front end surface of the positioning block (6) abuts against the fixing seat (4), and the rear end surface of the positioning block (6) abuts against the front end surface of the stator (9); when the radial locking mechanism (2) is in the contracted state, the positioning block (6) is removed.

10. The fixture according to claim 2, characterized in that: The avoidance hole (4012) is a tapered hole, the front end diameter of the tapered hole being smaller than the rear end diameter.

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