Plough hook cutter, small-size commutator and motor

Abstract

The invention discloses a plow hook cutter, a small-size commutator and a motor, the plow hook cutter is applied to processing a commutator copper shell, the copper shell comprises a plurality of K-shaped inner hooks arranged at equal intervals along the circumferential direction, and a hook groove is formed between every two adjacent K-shaped inner hooks; the plough hook cutter comprises a cutter bar, a first coulter, a second coulter and a cushion block, the first coulter is arranged on the periphery of the cutter bar, and a plurality of first coulter teeth are arranged on the outer surface of the first coulter; the second coulter is arranged on the periphery of the coulter bar, the second coulter is arranged at one end, deviating from the head of the coulter bar, of the first coulter, and a plurality of second coulter teeth are arranged on the outer surface of the second coulter; the multiple first coulter teeth and the multiple second coulter teeth are sequentially and alternately arranged at equal intervals in the circumferential direction, and the first coulter teeth and the second coulter teeth are the same in structure and used for machining hook grooves; the cushion block is connected between the first coulter and the second coulter; the commutator with the outer diameter larger than or equal to 6.8 mm and the K-shaped inner hook can be produced in batches in a high-quality mode.

Description

Technical Field

[0001] The present invention relates to the technical field of commutators, and in particular to a plow hook cutter, a small-sized commutator and a motor. Background Art

[0002] With increasingly stringent environmental regulations, automotive engine exhaust control technology continues to advance. As a key component of exhaust control systems, the performance of the electronic wastegate valve directly impacts exhaust emissions. The commutator, a core component of the electronic wastegate motor, is crucial in terms of size, performance, and reliability.

[0003] The commutator includes commutator segments, and the inner hooks of the commutator segments include C-type inner hooks and K-type inner hooks. Compared with the C-type inner hooks, the K-type inner hooks have a larger bonding area with the insulating base, a greater bonding force, and better overall mechanical properties. Therefore, the inner hooks of the commutators used for electronic exhaust valve motors in the industry are mostly K-type structures; the K-type inner hooks of the commutator segments are formed by tool processing, and the multiple plow teeth of the existing tool are arranged along the circumferential direction at the same height and are arranged one-to-one corresponding to the gaps between adjacent inner hooks; but due to the structure of the tool, when it is necessary to mass-produce a commutator with a diameter less than 7.8 mm and a K-type inner hook, the thinner copper shell is easily deformed under the force exerted by the plow teeth and the quality cannot be ensured; therefore, there is an urgent need for a tool that can stably mass-produce commutators with a diameter less than 7.8 mm and a K-type inner hook. Summary of the Invention

[0004] In view of this, the present invention provides a plow hook tool, a small-sized commutator and a motor to solve the problem in the prior art of the lack of tools that can stably mass-produce commutators with a diameter of less than 7.8 mm and a K-shaped inner hook.

[0005] In a first aspect, the present invention provides a plow hook tool for processing a copper shell of a commutator, wherein the copper shell includes a plurality of K-shaped inner hooks arranged at equal intervals along the circumference, and a hook groove is formed between two adjacent K-shaped inner hooks. The plow hook tool includes:

[0006] Tool bar;

[0007] a first coulter, arranged on the outer periphery of the cutter bar, wherein the outer surface of the first coulter is provided with a plurality of first coulter teeth;

[0008] a second coulter disposed on the outer periphery of the cutter bar, the second coulter being disposed at an end of the first coulter facing away from the head of the cutter bar, the outer surface of the second coulter being provided with a plurality of second coulter teeth; the plurality of first coulter teeth and the plurality of second coulter teeth being alternately arranged in a circumferential direction at equal intervals, the first coulter teeth and the second coulter teeth having the same structure and being used for machining the hook groove;

[0009] A pad is arranged on the outer periphery of the cutter bar, and the pad is connected between the first coulter and the second coulter.

[0010] A plow hook cutter according to the present invention has at least the following beneficial effects:

[0011] The first coulter and the second coulter are arranged on the cutter bar at intervals along the axial direction, and a plurality of first coulter teeth and a plurality of second coulter teeth are alternately arranged at equal intervals along the circumferential direction, and the sum of the number of the first coulter teeth and the second coulter teeth is equal to the number of the hook grooves; when the coulter hook tool is passed through the interior of the copper shell of the commutator along the axial direction to process the copper shell of the commutator, the plurality of first coulter teeth first contact the end of the copper shell and process the corresponding number of hook grooves; after the first coulter teeth process the corresponding number of hook grooves for a distance, the second coulter teeth begin to contact the end of the copper shell, And a corresponding number of hook grooves are processed; compared with the first coulter tooth and the second coulter tooth contacting the end of the copper shell at the same time and processing all the hook grooves, this coulter hook tool can reduce the force on the end face of the copper shell, thereby helping to avoid deformation of the copper shell; and the first coulter and the second coulter are arranged at intervals along the axial direction, which can increase the distance between two adjacent first coulter teeth, and increase the distance between two adjacent second coulter teeth, so that when processing the copper shell of the commutator, the force on a single first coulter tooth and a single second coulter tooth is reduced, avoiding problems such as tooth breakage. At the same time, by connecting a pad between the first coulter and the second coulter, the second coulter tooth contacts the end of the copper shell and starts to process the corresponding hook groove when the first coulter tooth is close to completing the processing of the corresponding hook groove. That is, the transition effect of the pad can reduce the force on the copper shell during the processing of the corresponding hook groove by the first coulter tooth and the second coulter tooth, making the thinner copper shell less likely to deform, thereby enabling high-quality batch production of commutators with an outer diameter greater than or equal to 6.8 mm and a K-type inner hook, so that the produced commutators have a compact structure, excellent performance, and high reliability, so that the automobile engine exhaust control system motor equipped with the commutator produced by the coulter hook tool meets the use requirements in high temperature environments.

[0012] In an optional embodiment, a guide head is provided on the outer periphery of the tool rod, and the guide head is provided at the end of the first coulter away from the second coulter. The guide head is provided with a guide protrusion corresponding to the position of the first coulter tooth and the second coulter tooth, and the guide protrusion is radially protruded on the outer surface of the guide head.

[0013] In an optional embodiment, it further includes a rod sleeve, the tail of the cutter rod is inserted into the rod sleeve and is detachably locked by a locking assembly; a limit platform is convexly provided on the outer surface of the head of the cutter rod, and the first coulter, the cushion block and the second coulter are movably sleeved on the cutter rod in sequence, the end of the first coulter facing away from the cushion block abuts against the limit platform, and the end of the second coulter facing away from the cushion block abuts against the head end of the rod sleeve.

[0014] In an optional embodiment, the side wall of the rod sleeve is penetrated by a plug-in hole connected to the interior of the rod sleeve, and the locking assembly includes a positioning plug-in matching the plug-in hole; the outer wall of the portion of the knife rod extending into the rod sleeve is provided with an arc-shaped groove corresponding to the plug-in hole, and when the knife rod and the rod sleeve are assembled, the positioning plug-in is plugged into the plug-in hole, and the positioning plug-in is embedded in the arc-shaped groove.

[0015] In a second aspect, the present invention further provides a small-sized commutator, comprising:

[0016] Insulating substrate;

[0017] The copper shell is processed and manufactured using the plow hook tool provided in the first aspect above. The copper shell is arranged on the outer peripheral surface of the insulating base and combined with the insulating base. The outer diameter of the copper shell is greater than or equal to 6.8 mm. The inner wall of the copper shell is provided with multiple K-shaped inner hooks along the circumferential direction. The K-shaped inner hooks are used to connect to the insulating base, and the space between two adjacent K-shaped inner hooks forms a hook groove.

[0018] A small-sized commutator according to the present invention has at least the following beneficial effects:

[0019] By using a plow hook tool to process high-quality hook grooves inside a copper shell with an outer diameter greater than or equal to 6.8 mm, a corresponding K-shaped inner hook is obtained, so that the outer diameter of the small-sized commutator can be greater than or equal to 6.8 mm, thereby making the small-sized commutator compact in structure, excellent in performance, and highly reliable, thereby enabling the automobile engine exhaust control system motor equipped with the small-sized commutator to meet the use requirements in high-temperature environments; at the same time, the K-shaped inner hook of the small-sized commutator is similar to the K-shape and is riveted to the insulating substrate, with a large bonding area, greater bonding force, good product strength, small dynamic operation step difference roundness change, and lower noise, thereby helping to improve the noise generated by the motor equipped with the small-sized commutator, and can well meet people's daily high-quality, high-standard, and low-cost requirements.

[0020] In an optional embodiment, an insulating groove is provided at a position on the side wall of the copper shell corresponding to the hook groove, and the insulating groove is connected to the hook groove. The multiple insulating grooves are used to divide the copper shell into multiple commutator segments insulated and isolated from each other, and each commutator segment is provided with a wire hanging hook on the relative upper end face along the axial direction, and the K-type inner hook is provided on the inner wall of the commutator segment at a position corresponding to the wire hanging hook.

[0021] In an optional embodiment, the width of the K-shaped inner hook is set to 0.8 mm to 1.2 mm.

[0022] In an optional embodiment, one end of the copper shell axially away from the wire hanging hook is configured as a lap portion, and an inner diameter of the lap portion is 0.04 mm to 0.06 mm larger than an inner diameter of the hook groove.

[0023] In an optional embodiment, the inner wall of the copper shell is provided with an annular groove, which is used to separate the K-type inner hook into a first inner hook portion and a second inner hook portion, the first inner hook portion being located at one end of the second inner hook portion facing the wire hanging hook; the end face of the first inner hook portion facing away from the second inner hook portion is set as a first inclined surface, and the first inclined surface extends from the outside to the inside along the radial direction of the copper shell, and is gradually inclined away from the second inner hook portion in the axial direction; a groove is provided on the inner side of the K-type inner hook combined with the insulating base, and the groove passes through the K-type inner hook at one end axially away from the first inclined surface; the end face of the second inner hook portion facing away from the first inner hook portion is set as a second inclined surface, and the second inclined surface extends from the outside to the inside along the radial direction of the copper shell, and is gradually inclined away from the first inner hook portion in the axial direction, and the end face of the second inner hook portion facing the first inner hook portion is set parallel to the second inclined surface.

[0024] In a third aspect, the present invention further provides a motor comprising the small-sized commutator provided in the second aspect.

[0025] Because the motor includes a small-sized commutator, it has the same beneficial effects as the small-sized commutator and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the cross-section of the hook-plough tool of this embodiment;

[0028] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0029] Figure 3 This is an exploded schematic diagram of some structures in the hook-plough tool of this embodiment;

[0030] Figure 4 Schematic diagram of the structure of the copper shell processed by the plow hook tool of this embodiment;

[0031] Figure 5 Schematic diagram of the three-dimensional structure of the small-sized commutator of this embodiment;

[0032] Figure 6 for Figure 5 Schematic diagram of the structure with the insulating base removed;

[0033] Figure 7 for Figure 6 A structural diagram from another perspective;

[0034] Figure 8 This is a schematic diagram of the cross-section of the small-sized commutator of this embodiment.

[0035] Description of reference numerals:

[0036] 100-copper shell, 110-hook groove, 120-insulation groove, 130-commutator segment, 131-hanging hook, 132-first part, 133-second part, 140-lap part, 150-annular groove;

[0037] 200-tool bar, 210-limiting platform, 220-arc groove;

[0038] 300-first coulter, 310-first coulter tooth;

[0039] 400-second coulter, 410-second coulter tooth;

[0040] 500-pad;

[0041] 600-guide head, 610-guide protrusion;

[0042] 700-rod sleeve, 710-positioning plug-in;

[0043] 800-insulation base;

[0044] 910 - first inner hook, 911 - first inclined surface, 912 - third inclined surface, 920 - second inner hook, 921 - second inclined surface, 930 - groove. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this embodiment and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0048] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0049] According to a first aspect of an embodiment of the present invention, a plow hook tool is provided for processing a copper shell 100 of a commutator. The copper shell 100 includes a plurality of K-shaped inner hooks arranged at equal intervals along the circumference, and a hook groove 110 is formed between two adjacent K-shaped inner hooks; the plow hook tool includes a tool bar 200, a first plow blade 300, a second plow blade 400 and a pad 500, the first plow blade 300 is arranged on the outer periphery of the tool bar 200, and the outer surface of the first plow blade 300 is provided with a plurality of first plow blade teeth 310; the second plow blade 400 is arranged on the outer periphery of the tool bar 200, The second coulter 400 is arranged at the end of the first coulter 300 away from the head of the tool rod 200, and the outer surface of the second coulter 400 is provided with a plurality of second coulter teeth 410; the plurality of first coulter teeth 310 and the plurality of second coulter teeth 410 are alternately arranged in sequence at equal intervals along the circumferential direction, the first coulter teeth 310 and the second coulter teeth 410 have the same structure and are used to process the hook groove 110; the pad 500 is arranged on the outer periphery of the tool rod 200, and the pad 500 is connected between the first coulter 300 and the second coulter 400.

[0050] The plow hook tool of this embodiment is achieved by axially arranging the first plow blade 300 and the second plow blade 400 on the tool rod 200, and arranging multiple first plow blade teeth 310 and multiple second plow blade teeth 410 alternately and circumferentially at equal intervals, and the sum of the number of first plow blade teeth 310 and second plow blade teeth 410 is equal to the number of hook grooves 110; when the plow hook tool of this embodiment is passed axially through the interior of the copper shell 100 of the commutator to process the copper shell 100 of the commutator, first, multiple first plow blade teeth 310 first contact the end of the copper shell 100 and process the corresponding number of hook grooves 110; after the first plow blade teeth 310 process the corresponding number of hook grooves 110 for a distance, the second plow blade teeth 410 start to contact The end of the copper shell 100 is contacted with the first coulter tooth 310 and the second coulter tooth 410 at the same time, and all the hook grooves 110 are processed. The coulter hook tool of this embodiment can reduce the force on the end face of the copper shell 100, thereby helping to avoid deformation of the copper shell 100; and the first coulter 300 and the second coulter 400 are arranged at intervals along the axial direction, which can increase the spacing between the two adjacent first coulter teeth 310 and the spacing between the two adjacent second coulter teeth 410, so that when processing the copper shell 100 of the commutator, the force on the single first coulter tooth 310 and the single second coulter tooth 410 is reduced, avoiding the occurrence of defects such as tooth breakage. At the same time, by connecting the pad 500 between the first coulter 300 and the second coulter 400, the second coulter tooth 410 contacts the end of the copper shell 100 and starts to process the corresponding hook groove 110 when the first coulter tooth 310 is close to completing the processing of the corresponding hook groove 110. That is, through the transition effect of the pad 500, the force on the copper shell 100 can be reduced during the process of the first coulter tooth 310 and the second coulter tooth 410 processing the corresponding hook groove 110, so that the thinner copper shell 100 is not easily deformed, so that high-quality batch production of commutators with an outer diameter greater than or equal to 6.8 mm and a K-type inner hook can be achieved, so that the produced commutators have a compact structure, excellent performance, and high reliability, so that the automobile engine exhaust control system motor equipped with the commutator produced by the coulter hook tool of this embodiment meets the use requirements in high temperature environments.

[0051] It should be noted that the plow hook tool of this embodiment can be used to process a commutator with an outer diameter of 6.8 mm with guaranteed quality and quantity. The commutator with an outer diameter of 6.8 mm can improve the mechanical properties of the motor of the automobile engine exhaust control system, increase the life of the motor, and improve market competitiveness; it is also conducive to achieving lightweight and miniaturization of automobiles.

[0052] It should be noted that the commutator with an outer diameter greater than or equal to 6.8 mm and a K-type inner hook manufactured by the plow hook tool of this embodiment has a large riveted bonding area with the insulating base 800 due to the K-type inner hook being similar to the K-shape, and has a greater bonding force. The commutator product has good strength, small change in dynamic operation step roundness, and lower noise. Therefore, it is beneficial to improve the noise generated by the motor equipped with the commutator manufactured by the plow hook tool of this embodiment, and can well meet people's daily high quality, high standard, and low cost requirements.

[0053] It is understandable that the outer diameter of the commutator (ie, the outer diameter of the copper shell 100 ) mentioned herein refers to the diameter of the outer wall of the copper shell 100 .

[0054] In specific applications, the hook-plough tool of this embodiment can process commutators with an outer diameter greater than or equal to 6.8 mm and less than 7.8 mm, and can also process commutators with a diameter greater than or equal to 7.8 mm.

[0055] It should be noted that the action of the first coulter tooth 310 and the second coulter tooth 410 in processing the hook groove 110 of this embodiment is similar to the action of "a farmer plowing the field", that is, the first coulter tooth 310 and the second coulter tooth 410 squeeze the inner wall of the copper shell 100, and use the designed slope of the first coulter tooth 310 and the second coulter tooth 410 to turn the copper up to form an inner hook.

[0056] It should be noted that the ratio of the axial dimension of the groove 930 to the axial dimension of the pad 500 is 0.6 to 0.9, ensuring that after the first coulter tooth 310 processes at least half of the corresponding hook groove 110, that is, after at least part of the end of the first coulter tooth 310 facing the head of the cutter rod 200 extends out of the copper shell 100, the second coulter tooth 410 contacts the end of the copper shell 100 and starts to process the corresponding hook groove 110.

[0057] like Figures 1 to 5 As shown, in some embodiments, a guide head 600 is provided on the outer periphery of the cutter bar 200. The guide head 600 is disposed at the end of the first coulter 300 facing away from the second coulter 400. The guide head 600 is provided with a guide protrusion 610 at the position corresponding to the first coulter tooth 310 and the second coulter tooth 410. The guide protrusion 610 is radially protruded from the outer surface of the guide head 600. The guide protrusion 610 serves as a guide and correction function, allowing the first coulter tooth 310 and the second coulter tooth 410 to more accurately machine the corresponding groove 930 to form the inner hook of the commutator. It should be noted that the diameter of the outer wall surface of the enclosed guide protrusion 610 is smaller than the diameter of the outer wall surface of the enclosed first coulter tooth 310. Because the first coulter tooth 310 and the second coulter tooth 410 have the same structure, the diameter of the outer wall surface of the enclosed first coulter tooth 310 is equal to the diameter of the outer wall surface of the second coulter tooth 410.

[0058] In some embodiments, the plow hook tool also includes a rod sleeve 700, the tail of the tool rod 200 is inserted into the rod sleeve 700, and is detachably locked by a locking assembly; a limit platform 210 is convexly provided on the outer surface of the head of the tool rod 200, and the first plow blade 300, the pad 500 and the second plow blade 400 are movably sleeved on the tool rod 200 in sequence, and the end of the first plow blade 300 facing away from the pad 500 abuts against the limit platform 210, and the end of the second plow blade 400 facing away from the pad 500 abuts against the head end of the rod sleeve 700. By such an arrangement, the tool bar 200, the first coulter 300, the cushion block 500, the second coulter 400 and the rod sleeve 700 are arranged separately, and the five components can be easily processed separately and then assembled, thereby reducing manufacturing costs; during assembly, the first coulter 300, the cushion block 500 and the second coulter 400 are first sleeved on the tool bar 200 from the tail end of the tool bar 200, and then the tail end of the tool bar 200 is inserted into the interior of the rod sleeve 700 until the second coulter 400 abuts against the head end of the rod sleeve 700 and the first coulter 300 abuts against the limit platform 210, and finally the locking assembly is locked to complete the assembly, and the entire assembly operation is simple.

[0059] like Figure 1 and Figure 2 As shown, specifically, the side wall of the rod sleeve 700 is penetrated by a plug-in hole connected to the interior of the rod sleeve 700, and the locking assembly includes a positioning plug-in 710 matching the plug-in hole; the outer wall of the knife rod 200 extending into the rod sleeve 700 is provided with an arc-shaped groove 220 corresponding to the plug-in hole. Through such an arrangement, when the plow hook tool of this embodiment is assembled, the first plow blade 300, the pad 500 and the second plow blade 400 are first sleeved on the knife rod 200 from the tail end of the knife rod 200 in sequence, and then the tail end of the knife rod 200 is inserted into the interior of the rod sleeve 700 until the second plow blade 400 abuts against the head end of the rod sleeve 700. At this time, the arc groove 220 is aligned with the plug-in hole, and then the positioning plug-in 710 is inserted into the plug-in hole, so that the positioning plug-in 710 can be embedded in the arc groove 220 to form a snap connection, thereby completing the assembly; when the plow hook tool of this embodiment is disassembled and assembled, it is only necessary to pull out the positioning plug-in 710 from the plug-in hole, and the entire disassembly and assembly process is easy to operate.

[0060] According to a second aspect of an embodiment of the present invention, a small-sized commutator is also provided, comprising an insulating base 800 and a copper shell 100. The copper shell 100 is processed and manufactured using the plow hook tool provided by the first aspect of the embodiment of the present invention. The copper shell 100 is arranged on the outer peripheral surface of the insulating base 800 and is combined with the insulating base 800. The outer diameter of the copper shell 100 is greater than or equal to 6.8 mm. The inner wall of the copper shell 100 is provided with a plurality of K-shaped inner hooks along the circumferential direction. The K-shaped inner hooks are used to connect the insulating base 800, and the space between two adjacent K-shaped inner hooks forms a hook groove 110.

[0061] The plow hook tool provided by the first aspect of the embodiment of the present invention can process the hook groove 110 with high quality inside the copper shell 100 with an outer diameter greater than or equal to 6.8 mm to obtain the corresponding K-shaped inner hook, so that the small-sized commutator of this embodiment can have an outer diameter greater than or equal to 6.8 mm on the basis of having the K-shaped inner hook, thereby making the small-sized commutator of this embodiment have a compact structure, excellent performance, and high reliability, thereby making the automobile engine exhaust control system motor equipped with the small-sized commutator of this embodiment meet the use requirements in high temperature environments; at the same time, the K-shaped inner hook of the small-sized commutator of this embodiment is similar to the K-shape and is riveted to the insulating base 800, with a large bonding area and greater bonding force, the commutator product has good strength, small change in dynamic operation step roundness, and lower noise, which is conducive to improving the noise generated by the motor equipped with the small-sized commutator of this embodiment, and can well meet people's daily high quality, high standards, and low cost requirements.

[0062] It is understood that the axial direction mentioned herein refers to the axial direction of the copper shell 100, which is parallel to the axial direction of the shank 200. Figure 1 The axial direction in is described as the axial direction.

[0063] Specifically, the outer diameter of the small-sized commutator of this embodiment is 6.8 mm, which can better meet the miniaturized motor design requirements of motor manufacturers, thereby facilitating the lightweighting and miniaturization of automobiles.

[0064] Specifically, the insulating base 800 is made of bakelite powder material of the brand PD8580BK, which makes the insulating base 800 have better heat resistance and small deformation in high temperature environment (that is, it can work stably at an ambient temperature of -40°C to 215°C), avoiding the problem of large deformation of the insulating base 800 at a temperature of 215°C, resulting in large changes in the roundness and step difference of the copper sheet, thereby meeting the use requirements of the electronic exhaust valve motor in a high temperature environment.

[0065] like Figures 5 to 8As shown, in some embodiments, an insulating groove 120 is provided at a position on the side wall of the copper shell 100 corresponding to the hook groove 110. The insulating groove 120 is connected to the hook groove 110. The multiple insulating grooves 120 are used to divide the copper shell 100 into multiple commutator segments 130 that are insulated and isolated from each other. Each commutator segment 130 is provided with a wire hook 131 on the upper end surface thereof along the axial direction. The K-shaped inner hook is provided at a position on the inner wall of the commutator segment 130 corresponding to the wire hook 131. By so configuring, a K-shaped inner hook is provided at the position corresponding to each wire hook 131, so that each commutator segment 130 maintains the same bonding force with the insulating base 800, and the bonding force is relatively large, the product strength is good, the dynamic operation step difference roundness change is small, and the noise is lower.

[0066] It is understandable that the diameter of the outer wall of the copper shell 100 (ie, the outer diameter of the copper shell 100 ) mentioned herein refers to the diameter of the outer wall of the enclosed commutator segment 130 .

[0067] Specifically, the commutator segment 130 is made of high-performance 3Ag-OFCu copper alloy material with a hardness controlled at HV105min, and has good electrical conductivity, wear resistance and high temperature resistance.

[0068] like Figure 6 and Figure 7 As shown, specifically, the commutator segment 130 includes a first portion 132 and a second portion 133. The wire hook 131 is provided at one end of the first portion 132 away from the second portion 133. The outer diameter of the second portion 133 is 0.08 mm to 0.12 mm larger than the outer diameter of the first portion 132, preferably 0.1 mm in this embodiment, to improve the connection strength between the wire hook 131 and the commutator segment 130. Here, the outer diameter of the copper shell 100 refers to the diameter of the outer wall surface of the enclosed commutator segment 130 near the end of the wire hook 131.

[0069] In some embodiments, the width dimension of the K-type inner hook is set to 0.8 mm to 1.2 mm, preferably 1 mm here; on the basis of ensuring that the number of K-type inner hooks is 8 and the outer diameter dimension of the commutator is 6.8 mm, on the one hand, it is to avoid the problem that the width dimension of the inner hook is too small, resulting in insufficient strength and unable to be processed and formed; on the other hand, it is to avoid the problem that the width dimension of the inner hook is too large, resulting in the width dimension of the hook groove 110 being too small, thereby making the plow teeth too small and lacking strength and unable to be formed.

[0070] like Figure 7 and Figure 8As shown, in some embodiments, the end of the copper shell 100 axially away from the wire hook 131 is set as a lap portion 140, and the inner diameter of the lap portion 140 is 0.04 mm to 0.06 mm larger than the inner diameter of the hook groove 110, preferably 0.05 mm. Because the outer diameter of the copper shell 100 in this embodiment is 6.8 mm and the weight is relatively light, the thickness of the lap portion 140 is smaller than the thickness of the copper shell 100 and can also withstand the weight of the copper shell 100 without deformation to meet production needs, so that the difference between the inner diameter of the lap portion 140 and the inner diameter of the hook groove 110 is reduced from the original 0.1 mm to 0.05 mm, which can increase the diameter of the first coulter tooth 310 and the second coulter tooth 410 to improve the coulter tooth strength, and avoid hitting the lap portion 140 when processing the hook groove 110 to shovel out burrs.

[0071] Specifically, after the groove 930 is processed, the wall thickness of the copper shell 100 is 0.65 mm, and the wall thickness of the overlapping portion 140 is 0.6 mm.

[0072] like Figure 6 and Figure 8As shown, in some embodiments, the inner wall of the copper shell 100 is provided with an annular groove 150, and the annular groove 150 is used to separate the K-type inner hook into a first inner hook portion 910 and a second inner hook portion 920, and the first inner hook portion 910 is located at one end of the second inner hook portion 920 facing the wire hook 131; the end surface of the first inner hook portion 910 away from the second inner hook portion 920 is set as a first inclined surface 911, and the first inclined surface 911 extends from the outside to the inside along the radial direction of the copper shell 100, and is gradually inclined away from the second inner hook portion 920 along the axial direction. ; A groove 930 is provided on the inner side where the K-shaped inner hook is combined with the insulating base 800, and the groove 930 passes through the K-shaped inner hook at one end axially away from the first inclined surface 911; the end surface of the second inner hook portion 920 away from the first inner hook portion 910 is set as a second inclined surface 921, and the second inclined surface 921 extends from the outside to the inside along the radial direction of the copper shell 100, and is gradually inclined away from the first inner hook portion 910 along the axial direction. The end surface of the second inner hook portion 920 facing the first inner hook portion 910 is arranged parallel to the second inclined surface 921. In the process of injection molding the copper shell 100 and the insulating base 800 to make the commutator of this embodiment, the annular groove 150 is filled with the insulating base 800, so that the interval area between the first inner hook portion 910 and the second inner hook portion 920 is filled with the insulating base 800, so that the first inner hook portion 910 and the second inner hook portion 920 cooperate to limit the axial freedom of the portion of the insulating base 800 located therebetween, thereby increasing the axial tensile strength of the copper shell 100 and the insulating base 800 in the commutator of this embodiment; at the same time, the second inner hook portion 920 is inclined at both ends in the axial direction, so that the side of the second inner hook portion 920 is arranged in a parallelogram shape, further improving the bonding strength between the commutator segment 130 of the commutator of this embodiment and the insulating base 800; and by passing the groove 930 through the K-shaped inner hook arrangement at one end axially away from the first inclined surface 911 In the process of injection molding the copper shell 100 and the insulating base 800 to make the commutator of this embodiment, the insulating base 800 can be filled into the groove 930, that is, the portion of the insulating base 800 located in the groove 930 is limited in the circumferential direction by the two surrounding walls of the groove 930, further increasing the circumferential tensile strength of the combination of the copper shell 100 and the insulating base 800 in the commutator of this embodiment; and the first inclined surface 911 covers the top of the groove 930, so that the portion of the insulating base 800 located in the groove 930 is in contact with the bottom end of the first inclined surface 911, and cooperates with the portion of the insulating base 800 covering the top of the first inclined surface 911, further increasing the axial tensile strength of the combination of the copper shell 100 and the insulating base 800 in the commutator of this embodiment, that is, further improving the bonding strength between the commutator segments 130 and the insulating base 800 in the commutator of this embodiment.

[0073] Specifically, the angle between the arrangement direction of the first inclined surface 911 and the axial direction is set to an acute angle. In the process of injection molding the copper shell 100 and the insulating base 800 to make the commutator of this embodiment, the first inclined surface 911 inclined at an acute angle can better increase the axial tensile strength of the combination of the copper shell 100 and the insulating base 800 in the commutator of this embodiment, and further improve the bonding strength between the commutator segment 130 and the insulating base 800 in the commutator of this embodiment.

[0074] like Figure 8 As shown, specifically, the end surface of the first inner hook portion 910 facing the second inner hook portion 920 is configured as a third inclined surface 912. The third inclined surface 912 extends radially from the outside to the inside of the copper shell 100 and is inclined gradually approaching the second inner hook portion 920 along the axial direction. This configuration allows the side of the first inner hook portion 910 to be configured similarly to an "isosceles trapezoid," further enhancing the bonding strength between the commutator segments 130 and the insulating base 800 of the commutator of this embodiment.

[0075] According to the third aspect of the embodiment of the present invention, a motor is also provided, which also includes the small-sized commutator provided by the second aspect of the embodiment of the present invention. The copper shell 100 of the commutator in the motor of this embodiment is processed and manufactured using the plow hook tool provided by the first aspect of the embodiment of the present invention, so that the outer diameter of the commutator in the motor of this embodiment is greater than or equal to 6.8 mm and has a K-shaped inner hook, which can not only make the commutator in the motor of this embodiment compact in structure, excellent in performance, and highly reliable, so that the motor of this embodiment meets the use requirements in high temperature environments; but also can be riveted with the insulating base 800 through the K-shaped similar K-shaped K-shaped inner hook, so that the bonding area is large, the bonding force is greater, the commutator strength is good, the dynamic operation step difference roundness changes little, and the noise is lower, which is conducive to improving the noise generated by the assembly of the motor of this embodiment, and can well meet people's daily high quality, high standard, and low cost requirements.

[0076] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended invention.

Claims

1. A plow hook tool for processing a copper shell (100) of a commutator, wherein the copper shell (100) comprises a plurality of K-shaped inner hooks arranged at equal intervals along the circumference, and a hook groove (110) is formed between two adjacent K-shaped inner hooks, characterized in that: The plow hook tool comprises: Tool bar (200); A first coulter (300) is arranged on the outer periphery of the cutter bar (200), and a plurality of first coulter teeth (310) are provided on the outer surface of the first coulter (300); A second coulter (400) is arranged on the outer periphery of the cutter bar (200), the second coulter (400) is arranged at an end of the first coulter (300) away from the head of the cutter bar (200), and a plurality of second coulter teeth (410) are arranged on the outer surface of the second coulter (400); the plurality of first coulter teeth (310) and the plurality of second coulter teeth (410) are alternately arranged at equal intervals along the circumferential direction, the first coulter teeth (310) and the second coulter teeth (410) have the same structure, and are used for processing the hook groove (110); A cushion block (500) is arranged on the outer periphery of the cutter bar (200), and the cushion block (500) is connected between the first coulter (300) and the second coulter (400).

2. A plow hook tool according to claim 1, characterized in that: A guide head (600) is provided on the outer periphery of the cutter bar (200), and the guide head (600) is provided at one end of the first coulter (300) away from the second coulter (400). The guide head (600) is provided with a guide protrusion (610) at the position corresponding to the first coulter tooth (310) and the second coulter tooth (410), and the guide protrusion (610) is radially protruded on the outer surface of the guide head (600).

3. A plow hook tool according to claim 1, characterized in that: The utility model further comprises a rod sleeve (700), wherein the tail of the knife rod (200) is inserted into the rod sleeve (700) and is detachably locked by a locking assembly; a limit platform (210) is convexly provided on the outer surface of the head of the knife rod (200); the first coulter (300), the cushion block (500) and the second coulter (400) are movably sleeved on the knife rod (200) in sequence; the end of the first coulter (300) facing away from the cushion block (500) abuts against the limit platform (210), and the end of the second coulter (400) facing away from the cushion block (500) abuts against the head end of the rod sleeve (700).

4. A plow hook tool according to claim 3, characterized in that: The side wall of the rod sleeve (700) is provided with a plug-in hole connected to the interior of the rod sleeve (700), and the locking assembly includes a positioning plug-in (710) matching the plug-in hole; the outer wall of the portion of the knife rod (200) extending into the rod sleeve (700) is provided with an arc-shaped groove (220) corresponding to the plug-in hole; when the knife rod (200) and the rod sleeve (700) are assembled, the positioning plug-in (710) is plugged into the plug-in hole, and the positioning plug-in (710) is embedded in the arc-shaped groove (220).

5. A small-sized commutator, characterized in that: include: an insulating substrate (800); A copper shell (100) is manufactured using a plow hook tool according to any one of claims 1 to 4 above, wherein the copper shell (100) is arranged on the outer peripheral surface of the insulating base (800) and is combined with the insulating base (800), the outer diameter of the copper shell (100) is greater than or equal to 6.8 mm, and the inner wall of the copper shell (100) is provided with a plurality of K-shaped inner hooks along the circumferential direction, wherein the K-shaped inner hooks are used to connect the insulating base (800), and the space between two adjacent K-shaped inner hooks forms a hook groove (110).

6. The small-sized commutator according to claim 5, characterized in that: An insulating groove (120) is provided at a position on the side wall of the copper shell (100) corresponding to the hook groove (110), and the insulating groove (120) is communicated with the hook groove (110). The plurality of insulating grooves (120) are used to divide the copper shell (100) into a plurality of commutator segments (130) insulated and isolated from each other. Each commutator segment (130) is provided with a wire hanging hook (131) on its upper end face along the axial direction, and the K-shaped inner hook is provided at a position on the inner wall of the commutator segment (130) corresponding to the wire hanging hook (131).

7. The small-sized commutator according to claim 5, characterized in that: The width of the K-shaped inner hook is set to 0.8 mm to 1.2 mm.

8. The small-sized commutator according to claim 6, characterized in that: One end of the copper shell (100) axially away from the wire hook (131) is provided as a lap portion (140), and the inner diameter of the lap portion (140) is 0.04 mm to 0.06 mm larger than the inner diameter of the hook groove (110).

9. The small-sized commutator according to claim 6, characterized in that: The inner wall of the copper shell (100) is provided with an annular groove (150), and the annular groove (150) is used to separate the K-type inner hook into a first inner hook portion (910) and a second inner hook portion (920), wherein the first inner hook portion (910) is located at one end of the second inner hook portion (920) facing the wire hook (131); the end surface of the first inner hook portion (910) away from the second inner hook portion (920) is provided as a first inclined surface (911), and the first inclined surface (911) extends from the outside to the inside along the radial direction of the copper shell (100), and is gradually inclined away from the second inner hook portion (920) along the axial direction; the K A groove (930) is provided on the inner side of the K-shaped inner hook combined with the insulating base (800), and the groove (930) passes through the K-shaped inner hook at one end axially away from the first inclined surface (911); the end surface of the second inner hook (920) away from the first inner hook (910) is provided as a second inclined surface (921), and the second inclined surface (921) extends from the outside to the inside along the radial direction of the copper shell (100), and is gradually inclined away from the first inner hook (910) along the axial direction. The end surface of the second inner hook (920) facing the first inner hook (910) is provided in parallel with the second inclined surface (921).

10. A motor, characterized in that: A small-sized commutator comprising the small-sized commutator according to any one of claims 5 to 9.

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