A welding limit tool

Abstract

The utility model relates to the technical field of motor manufacturing, and discloses a welding limit fixture, which is suitable for welding the winding of the hook commutator of the motor rotor. The welding limit fixture includes: a cylindrical main body and a limit part fixed to the end of the main body. During welding, the main body can be sleeved on the outer periphery of the hook commutator to press and fix the winding wound on the hook of the hook commutator, which can prevent the end of the winding from shifting or detaching from the hook during welding; at the same time, the limit part can gather the winding located on the side of the hook, so that the winding fits the hook, fixes and shapes the winding, facilitates welding, and makes the appearance of the wire group formed by the winding more beautiful.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to a welding limiting tool. Background Art

[0002] The commutator, also known as the rectifier, is an important component in the motor. The commutator is generally composed of multiple copper sheets (commutator sheets) separated by mica sheets in a cylindrical or disc shape. Each copper sheet is connected to several armature winding elements. When the armature rotor rotates, the copper sheets successively contact the fixed brushes.

[0003] When the motor uses a hook commutator, both ends or one end of the winding wire wound on the rotor are usually welded to the hook of the hook commutator, and then the hook is bent to abut the body of the hook commutator. However, when the wire diameter of the winding wire is relatively thick, the end of the winding wire located in the hook is often deformed due to being squeezed by the welding rod, or it is separated from the hook, or it causes poor spot welding, resulting in low rotor stability. In addition, when the winding wire is welded to a smaller hook commutator, the above technical defects are more likely to appear. Utility Model Content

[0004] The utility model aims to provide a welding limit fixture to solve the problem that the winding wire is easily separated from the hook of the hook-type commutator or the spot welding is poor when the wire diameter of the motor winding wire is relatively thick.

[0005] In order to solve the above technical problems, an embodiment of the utility model provides a welding limit tool, which is suitable for welding and limiting the winding of the hook-type commutator of the motor rotor; the hook-type commutator includes a cylindrical main body and a hook fixed to the main body, and the winding is hung on the hook; the welding limit tool includes a cylindrical main body and a limit part fixed to the end of the main body, the main body is sleeved on the outer circumference of the main body, and the main body presses and fixes the winding located on the inner side of the hook, the limit part protrudes beyond the end of the main body at least in the axial direction of the main body, and the limit part gathers the winding located on the side of the hook.

[0006] Optionally, there are multiple limiting portions and they are evenly spaced around the axis of the main body, and any two adjacent limiting portions respectively gather the windings on the two side surfaces corresponding to the curved hook, and the end surface of the main body between any two adjacent limiting portions presses and fixes the windings on the inner side of the curved hook.

[0007] Optionally, the hook-type commutator comprises a plurality of commutator segments fixed to the main body, a gap is provided between any two adjacent commutator segments, a radial dimension of the limiting portion of the main body is greater than a radial thickness of the main body, and the limiting portion extends into the gap.

[0008] Optionally, the hook-type commutator includes a plurality of commutator segments fixed to the main body, a gap is provided between any two adjacent commutator segments, and the limiting portion includes a first sub-limiting portion and a second sub-limiting portion fixedly connected, the first sub-limiting portion extending along the circumferential direction of the main body, and the second sub-limiting portion extending along the radial direction of the main body; the first sub-limiting portion gathers the winding located on the side of the bent hook, and the second sub-limiting portion extends into the gap.

[0009] Optionally, the main body and the limiting portion are integrally arranged.

[0010] Optionally, the main body and the limiting portion are made of metal.

[0011] Optionally, an end of the limiting portion away from the main body portion is provided with a chamfer.

[0012] Optionally, the diameter of the winding is greater than or equal to 0.96 mm.

[0013] Optionally, the inner side of the hook accommodates two sections of the winding wire.

[0014] Optionally, the main body includes a first end close to the hook and a second end away from the hook, the hook is provided with an end protruding from the main body, the end is inclined toward the second end, and the welding limit tooling moves axially from the second end toward the first end.

[0015] Compared with the prior art, the embodiment of the utility model can sleeve the main body of the welding limit fixture on the outer periphery of the hook-type commutator during welding to press and fix the winding wire wound on the hook of the hook-type commutator, thereby preventing the end of the winding wire from shifting or detaching from the hook during welding. At the same time, the limit part of the welding limit fixture can gather the winding wire on the side of the hook, so that the winding wire fits the hook, fixes and shapes the winding wire, facilitates welding, and makes the appearance of the wire group formed by the winding wire more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of a welding limit fixture and a hook-type commutator in one embodiment of the utility model;

[0018] Figure 2 It is a front view schematic diagram of a welding limit fixture and a hook-type commutator in one embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the cooperation between the welding limit fixture and the hook type commutator in one embodiment of the utility model;

[0020] Figure 4 It is a top view schematic diagram of a welding limit fixture in one embodiment of the utility model;

[0021] Figure 5 yes Figure 4 A front view schematic diagram of a welding limit fixture;

[0022] Figure 6 It is a top view schematic diagram of another welding limit fixture of one embodiment of the utility model;

[0023] Figure 7 yes Figure 6 A front view schematic diagram of a welding limit fixture;

[0024] Figure 8 It is a schematic diagram of a method for welding the winding of a hook-type commutator using the welding limit tooling provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following will be described in detail with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0026] In the embodiments of the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0027] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0028] In addition, the terms "installed", "set", "provided with", "opened", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0030] The implementation details of the welding limit fixture of the present invention are specifically described below. The following content is only provided for the convenience of understanding the implementation details and is not necessary for implementing this solution.

[0031] See also Figures 1 to 3 The welding stopper 100 of one embodiment of the utility model is used for welding the winding 300 of the hook-type commutator 200 of the motor rotor, and includes: a main body 110 and a stopper 120. The main body 110 is cylindrical and is used to be sleeved on the outer periphery of the main body 210 of the hook-type commutator 200 during welding, and to press and fix the winding 300 wound on the hook 220 of the hook-type commutator 200. The stopper 120 is fixed to the end of the main body 110, and protrudes from the end of the main body 110 at least in the axial direction of the main body 110. The stopper 120 is used to gather or hold the winding 300 located on the side of the hook 220 of the hook-type commutator 200 when the main body 110 is sleeved on the outer periphery of the main body 210 of the hook-type commutator 200.

[0032] For the convenience of example description, the rotor core and rotor winding at one axial end of the hook 220 of the hook commutator 200 are hidden in the figure, and the winding 300 is led out to the hook 220 as a part of the rotor winding. And for further example description, only one group of windings 300 is hung on the hook 220.

[0033] With such a configuration, when the two ends of the winding wire 300 are welded and fixed at the hook 220, the main body 110 of the welding stopper 100 can be sleeved on the outer periphery of the hook commutator 200 to hold and fix the winding wire 300 wound on the hook 220 of the hook commutator 200, thereby preventing the end of the winding wire 300 from shifting or detaching from the hook 220 during the welding process. At the same time, the stopper 120 of the welding stopper 100 can gather the winding wire 300 located on the side of the hook 220, so that the winding wire 300 fits the hook 220, fixes and shapes the winding wire 300, facilitates welding, and makes the appearance of the wire group formed by the winding wire 300 more beautiful.

[0034] It can be understood that the main body 210 of the hook type commutator 200 has a plurality of commutator segments 211, and any two adjacent commutator segments 211 are separated by insulating sheets such as mica sheets, so that there is a gap 211a between any two adjacent commutator segments 211. In addition, each commutator segment 211 is provided with a hook 220 at the same end, and the hook 220 is used to fix the end of the winding 300.

[0035] In addition, after being bent, the hook 220 of the hook-type commutator 200 forms a space S with an opening together with the main body 110. After the winding 300 is wound on the rotor, the ends of the winding 300 are bent on opposite sides of a hook 220 and extend into the space S. Then, the winding 300 is cut near the hook 220.

[0036] In some feasible solutions, there are multiple limiting portions 120, and they are evenly spaced around the axis of the main body 110. During welding, any two adjacent limiting portions 120 are used to respectively gather the winding 300 on two opposite sides of the hook 220 of the hook commutator 200, and the end surface of the main body 110 between any two adjacent limiting portions 120 is used to press and fix the winding 300 wound on the hook 220 of the hook commutator 200. That is, after the welding stopper 100 is used for stoppering, the space between two adjacent stoppers 120 is used to accommodate a hook 220, and the two stoppers 120 can squeeze the winding 300 located on both sides of the hook 220 from both sides of the hook 220, so that the winding 300 is closely attached to the hook 220, thereby realizing the shaping of the winding 300. At the same time, the two stoppers 120 can also prevent the portion of the winding 300 located in the space S from moving in a direction away from the hook 220, thereby preventing the end of the winding 300 from detaching from the hook 220. In addition, the portion of the end face of the main body 110 located between the two stoppers 120 squeezes the two ends of the winding 300 from the opening formed by the hook 220 toward the hook 220, so that the positions of the two ends of the winding 300 are fixed and closely attached to the hook 220.

[0037] It is understandable that the number of the limiting parts 120 does not need to be specifically limited, and the number is determined by the number of the hooks 220 of the hook type commutator 200, for example, equal to the number of the hooks 220. In this way, it can be ensured that each hook 220 has two limiting parts 120 to fix and shape the winding 300.

[0038] It is understandable that the number of windings 300 hung on the hook 220 is not specifically limited. A single winding 300 can be hung on a hook 220, or two or more windings 300 can be hung on a hook 220, which is determined by the selected winding process.

[0039] It can be understood that the welding limiting tool 100 is sleeved on the outer periphery of the hook type commutator 200 from one axial end away from the hook 220 toward the space S.

[0040] See also Figure 4 and Figure 5 In some feasible schemes, the radial dimension of the limiting portion 120 in the main body 110 is greater than the radial thickness of the main body 110. During welding, the portion of the limiting portion 120 in the radial direction is used to extend into the gap 211a between two adjacent commutator segments 211 in the hook-type commutator 200, so as to circumferentially position the welding limiting tool 100, so that the limiting portion 120 can accurately extend into the gap 221 between two adjacent hooks 220 in the hook-type commutator 200.

[0041] For example, the radial dimension of the limiting portion 120 may be slightly larger than the wall thickness of the main body 110 in the radial direction, and the portion exceeding the radial dimension extends toward the axis of the main body 110, that is, exceeds the inner wall of the main body 110. When the welding limiting fixture 100 is sleeved on the outer periphery of the hook-type commutator 200, the portion of the limiting portion 120 exceeding the inner wall of the main body 110 extends into the gap 211a between two adjacent commutator segments 211. Under the restriction of the two commutator segments 211, the welding limiting fixture 100 cannot rotate axially relative to the hook-type commutator 200, thereby ensuring that each limiting portion 120 can accurately extend into the gap 221 between the corresponding two hooks 220.

[0042] See again Figure 5 In some feasible solutions, the limiting portion 120 is configured to be tooth-shaped, and a chamfer is provided at the end thereof away from the main body 110. For example, the limiting portion 120 extends circumferentially along the main body 110, and chamfers are provided on both sides of the end of the limiting portion 120 away from the main body 110 in the circumferential direction, and the chamfers can be used to guide the limiting portion 120 to accurately extend into the gap 221 between two adjacent hooks 220.

[0043] Optionally, the chamfer may be set to an oblique chamfer, a round chamfer, etc., which may be selected according to actual needs, and the embodiment of the utility model does not make any specific limitation on this.

[0044] In some feasible solutions, the insulating sheet separating the commutator segments 211 is disposed at one end of the commutator segments 211 close to the hook 220, so the shape of the stopper 120 can be appropriately adjusted. For example, the portion of the stopper 120 that does not extend beyond the inner wall of the main body 110 is made to protrude relative to the portion that extends beyond the inner wall of the main body 110 in the axial direction. In this way, when the portion of the stopper 120 that extends beyond the inner wall of the main body 110 is blocked by the insulating sheet and cannot continue to move axially, the portion of the stopper 120 that does not extend beyond the inner wall of the main body 110 can still extend normally between the two hooks 220.

[0045] See also Figure 6 and Figure 7 In some feasible embodiments, the limiting part 120 includes a first sub-limiting part 121 and a second sub-limiting part 122 which are fixedly connected, the first sub-limiting part 121 extending along the circumference of the main body 110, and the second sub-limiting part 122 extending along the radial direction of the main body 110. During welding, the first sub-limiting part 121 is used to gather the winding 300 located on the side of the hook 220 of the hook commutator 200, and the second sub-limiting part 122 is used to extend into the gap 211a between two adjacent commutator segments 211 in the hook commutator 200, so as to perform circumferential positioning of the welding limiting tool 100. For example, the cross section of the limiting part 120 perpendicular to the axis of the main body 110 is approximately "T" shaped. It can be understood that the horizontal part of the "T" is slightly bent, which is the first sub-limiting part 121, and the vertical part thereof extends from the first sub-limiting part 121 toward the axis of the main body 110, which is the second sub-limiting part 122.

[0046] Optionally, the first sub-limiting portion 121 may protrude relative to the second sub-limiting portion 122 in the axial direction, or may be flush with the second sub-limiting portion 122 , and the specific selection may be made according to actual conditions.

[0047] Furthermore, both sides of the end of the first sub-limiting portion 121 away from the main body 110 in the circumferential direction may be provided with chamfers, so as to guide the first sub-limiting portion 121 to accurately extend into the gap 221 between two adjacent hooks 220. In addition, both sides of the end of the second sub-limiting portion 122 away from the main body 110 in the circumferential direction may also be provided with chamfers, so as to guide the second sub-limiting portion 122 to accurately enter the gap 211a between two adjacent commutator segments 211.

[0048] Similarly, the first sub-limiting portion 121 may also be configured to be in a tooth shape, or may also be configured to be in a sheet shape.

[0049] In some feasible solutions, the first sub-limiting portion 121 and the second sub-limiting portion 122 are integrally provided. It is understandable that the first sub-limiting portion 121 and the second sub-limiting portion 122 can also be provided separately and then fixedly connected to each other, such as by welding.

[0050] In some feasible solutions, the main body 110 and the limiting part 120 are integrally provided. Similarly, the main body 110 and the limiting part 120 can also be provided separately and then fixedly connected by welding or other methods.

[0051] In some feasible solutions, the welding stopper 100 is made of metal, that is, the main body 110 and the stopper 120 are made of metal. In this way, it can be ensured that the welding stopper 100 has a certain rigidity, and when the winding 300 is fixed and shaped, the welding stopper 100 will not be plastically deformed.

[0052] Generally speaking, the winding 300 is a copper wire. Therefore, the welding limit fixture may be manufactured preferably using a material having a Young's modulus greater than that of copper, such as steel. Of course, materials other than steel may also be used.

[0053] To further illustrate the welding stopper 100 of this embodiment, the following describes a method for welding the hook type commutator 200 and the winding 300 using the welding stopper 100 provided in this embodiment. Figure 8 , as follows:

[0054] S100. Sleeve the welding limit fixture 100 on the outer periphery of the main body 210 of the hook type commutator 200 , with one end of the welding limit fixture 100 provided with the limit portion 120 facing the other end of the hook type commutator 200 provided with the hook 220 .

[0055] S200 . Lay two ends of the winding wire 300 wound around the motor rotor in the space S formed by the hook 220 of the hook-type commutator 200 .

[0056] S300 . Push the welding limit fixture 100 axially, so that the limit portion 120 extends into the gap 221 between two adjacent hooks 220 , and the main body 110 of the welding limit fixture 100 presses and fixes the two ends of the winding 300 .

[0057] S400 . Weld the two ends of the winding wire 300 to fix the winding wire 300 .

[0058] S500 . Bend the end of the hook 220 so that the end of the hook 220 abuts against the main body 210 of the hook commutator 200 .

[0059] For step S100, specifically: after the winding 300 is wound on the rotor, the welding limit fixture 100 is put onto the outer periphery of the main body 210 of the hook type commutator 200. At this time, the end of the welding limit fixture 100 with the limit part 120 should face the end of the hook type commutator 200 with the bent hook 220.

[0060] For step S200, specifically: extend the two ends of the winding 300 into the areas on both sides of the hook 220 from different directions, and bend the two ends of the winding 300 to make it enter the space S formed by the hook 220, and then cut the winding 300 at the position close to the hook 220.

[0061] Step S300 specifically includes: axially pushing the welding limiting tool 100 so that different limiting parts 120 extend into the gaps 221 between different hooks 220. At this time, the limiting parts 120 can squeeze the windings 300 on both sides of the hooks 220 to shape the windings 300, and the end surface of the main body 110 between the two limiting parts 120 can squeeze and fix the end of the windings 300 in the space S.

[0062] Step S400 specifically includes: after the position of the winding 300 is fixed, the winding 300 is welded and fixed to the hook 220 or to the main body 210 of the hook type commutator 200 using a welding tool.

[0063] Step S500 specifically includes: after the two ends of the winding 300 are welded and fixed, the hook 220 is further bent so that the end of the hook 220 abuts against the surface of the commutator segment 211 to prevent the winding 300 from jumping out of the opening of the hook 220 .

[0064] It should be noted that, for windings with smaller wire diameters, since the influence of the force acting on the hook 220 when it is bent is generally not too great, the welding stopper 100 provided by the utility model may not be used. However, when the wire diameter of the winding is larger (for example, the wire diameter is above 0.96 mm), it is easy for the winding to be separated from the hook 220 or the spot welding is poor. At this time, the welding stopper 100 provided by the utility model may be used during welding. At the same time, in order to adapt to the wire diameters of different windings, the specific dimensions of the welding stopper 100, such as the number, size, gap width, etc. of the stopper 120, may also be improved according to actual conditions.

[0065] It should be noted that the order of steps S100 and S200 can be reversed, that is, step S200 is performed first and then step S100, and then step S300, step S400, and step S500 are performed in sequence. In this way, the winding 300 can be always kept at a specific position of the hook 220 after the winding is completed, thereby improving the connection stability.

[0066] The utility model provides a welding limit tool 100, which can solve the problem that the winding 300 of the motor is prone to detach from the hook 220 of the hook commutator 200 or poor spot welding when the wire diameter of the winding 300 is relatively thick, thereby ensuring a stable connection between the winding 300 and the hook 220 during the welding process, facilitating the welding work and improving the yield rate.

[0067] It should be further explained that the above-mentioned multiple feasible solutions can be combined and referenced according to actual needs when they do not conflict with each other, and the various different solutions obtained in this way should also be within the protection scope of the present utility model.

[0068] The welding limit fixture provided by the implementation method of the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the utility model. The description of the above embodiments is only used to help understand the idea of ​​the utility model. There may be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A welding limiter tool, suitable for welding and limiting the winding of a hook-type commutator of a motor rotor, wherein the hook-type commutator comprises a cylindrical main body and a hook fixed to the main body, and the winding is hung on the hook; characterized in that: The welding limiting tool includes a cylindrical main body and a limiting part fixed to the end of the main body, the main body is sleeved on the outer circumference of the main body, and the main body presses and fixes the winding located on the inner side of the hook, the limiting part protrudes beyond the end of the main body at least in the axial direction of the main body, and the limiting part gathers the winding located on the side of the hook.

2. The welding limiter according to claim 1, characterized in that: There are multiple limiting parts and they are evenly spaced around the axis of the main body. Any two adjacent limiting parts respectively gather the windings on the two side surfaces corresponding to the curved hook, and the end surface of the main body between any two adjacent limiting parts presses and fixes the windings on the inner side of the curved hook.

3. The welding limiter according to claim 2 is characterized in that: The hook-type commutator includes a plurality of commutator segments fixed to the main body, a gap is provided between any two adjacent commutator segments, the radial dimension of the limiting portion in the main body is greater than the radial thickness of the main body, and the limiting portion extends into the gap.

4. The welding limiter according to claim 2, characterized in that: The hook-type commutator includes a plurality of commutator segments fixed to the main body, a gap is provided between any two adjacent commutator segments, the limiting portion includes a first sub-limiting portion and a second sub-limiting portion fixedly connected, the first sub-limiting portion extends along the circumferential direction of the main body, and the second sub-limiting portion extends along the radial direction of the main body; the first sub-limiting portion gathers the winding located on the side of the curved hook, and the second sub-limiting portion extends into the gap.

5. The welding limiter according to claim 1, characterized in that: The main body and the limiting portion are integrally arranged.

6. The welding limiter according to claim 1, characterized in that: The main body and the limiting part are made of metal material.

7. The welding limiter according to any one of claims 1 to 6, characterized in that: An end of the limiting portion away from the main body portion is provided with a chamfer.

8. The welding limiter according to any one of claims 1 to 6, characterized in that: The diameter of the winding is greater than or equal to 0.96 mm.

9. The welding limiter according to any one of claims 1 to 6, characterized in that: The inner side of the hook accommodates two sections of the winding wire.

10. The welding limiter according to any one of claims 1 to 6, characterized in that: The main body includes a first end close to the hook and a second end away from the hook. The hook is provided with an end protruding from the main body, and the end is inclined toward the second end. The welding limiting tool moves axially from the second end toward the first end.

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