Injection mold for motor brush carrier assembly

Abstract

The utility model relates to the technical field of brush carrier assembly production, in particular to an injection mold for a motor brush carrier assembly. The utility model provides a motor brush carrier assembly injection mold. The motor brush carrier assembly injection mold comprises an upper mold plate, a middle mold plate, an upper cavity insert, a lower cavity insert and a demolding mechanism, a mounting cavity for mounting the lower cavity insert is formed in the upper surface of the middle mold plate, and a cavity for mounting the upper cavity insert is formed in the lower surface of the upper mold plate; a first concave part for forming a first pattern is arranged on the upper surface of the lower cavity insert, a second concave part for forming a second pattern is arranged on the lower surface of the upper cavity insert, and the first concave part and the second concave part are attached to each other to form an injection molding cavity opposite to the appearance structure of the brush carrier; and a limiting mechanism is arranged in the first sunken part. The conductive sheet does not need to be fixed on the brush carrier by using an adhesive, the processing steps are simple, the period is short, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brush holder assembly production, in particular to an injection mold for a motor brush holder assembly. Background Art

[0002] The brush holder assembly is a key component of the brushed DC torque motor, used to transmit current. The brushes of the brush holder assembly alternately contact the commutator segments of the DC torque motor rotor to achieve commutation of the DC motor. The brush holder assembly consists of a brush holder, conductive segments, and brushes.

[0003] There are two main methods for producing brush holder assemblies in the prior art. First, the brush holder is machined, then the conductive sheet is attached to the holder using adhesive, and finally the brushes are connected to the sheet. Second, the brush holder is injection molded, then the conductive sheet is attached to the holder using adhesive, and finally the brushes are connected to the sheet.

[0004] The two existing methods for producing brush holder components both have the problems of complex processing, long cycle and low efficiency. Utility Model Content

[0005] (1) The problem to be solved by the present invention is that both of the above two methods for producing brush holder components have the problems of complex processing, long cycle and low efficiency.

[0006] (2) Technical solution

[0007] A motor brush holder assembly injection mold, comprising an upper mold plate, a middle mold plate, an upper cavity insert, a lower cavity insert and a demoulding mechanism;

[0008] The upper surface of the middle template is provided with a mounting cavity for mounting the lower cavity insert, and the lower surface of the upper template is provided with a cavity for mounting the upper cavity insert;

[0009] The upper surface of the lower cavity insert is provided with a first recessed portion forming a first pattern, and the lower surface of the upper cavity insert is provided with a second recessed portion forming a second pattern, and the first recessed portion and the second recessed portion are fitted together to form an injection cavity having an opposite outer structure to the brush holder;

[0010] A limiting mechanism is provided in the first recessed portion, and the limiting mechanism is used to limit the conductive sheet in the motor brush holder assembly so that the conductive sheet is limited in the first recessed portion;

[0011] The demoulding mechanism is located on a side of the middle template away from the upper template and is used to extend into the first recessed portion to push the brush holder in the first recessed portion out of the first recessed portion.

[0012] According to one embodiment of the present invention, the first recessed portion includes a circular groove opened on the upper surface of the lower mold insert and a model block 1 disposed in the circular groove, a main cavity is formed between the side surface of the model block 1 and the inner wall of the circular groove, and the upper surface of the model block 1 is lower than the upper surface of the lower mold insert;

[0013] The second recessed portion includes a second model block having the same shape as the first model block, the lower surface of the second model block is lower than the lower surface of the upper cavity insert, the projection of the second model block in the direction of the lower cavity insert coincides with the first model block, and the height difference between the upper surface of the first model block and the upper surface of the lower cavity insert is the same as the thickness of the second model block;

[0014] When the upper cavity insert is pressed onto the lower cavity insert, the first mold block and the second mold block come into contact with each other to form an injection mold block, and the injection cavity is formed between the side surface of the injection mold block and the inner wall of the circular groove;

[0015] A flow channel is provided on the upper surface of the model block 1, and the flow channel is connected to the main cavity. A feed port that passes through the model block 2 is provided on the upper cavity insert. When the upper cavity insert is pressed onto the lower cavity insert, the feed port is connected to the flow channel.

[0016] According to one embodiment of the present invention, the limiting mechanism includes a gap structure provided on the model block one, the gap structure includes a first gap and a second gap, the first gap and the second gap are both connected to the main body cavity, and the first gap and the second gap are distributed in an eight-shaped shape, when the conductive sheet is inserted into the gap structure, the two ends of the conductive sheet are respectively inserted into the first gap and the second gap, and the middle part of the conductive sheet is located in the main body cavity.

[0017] According to an embodiment of the present invention, two gap structures are provided, and the two gap structures are symmetrically arranged with respect to the model block.

[0018] According to one embodiment of the present invention, the limiting mechanism includes a positioning insert, and a positioning insert mounting groove for mounting the positioning insert is formed on the upper surface of the model block 1, the positioning insert mounting groove is communicated with the main body cavity, and an installation gap for inserting the conductive sheet is formed between the positioning insert and the positioning insert mounting groove;

[0019] Two positioning inserts and two positioning insert installation grooves are provided to form two installation gaps, and the two positioning insert installation grooves are distributed in an eight-shaped shape.

[0020] According to an embodiment of the present invention, the limiting mechanism further comprises a positioning insert rod and a model rod, the positioning insert rod and the model rod are in one-to-one correspondence, and the model rod is installed in the main body cavity;

[0021] A positioning rod mounting groove for mounting the positioning rod is provided on the bottom wall of the main body cavity; a limiting gap for inserting the conductive sheet is formed between the positioning rod and the model rod, and the limiting gap is located between the first gap and the second gap;

[0022] Two ends of the conductive sheet are respectively inserted into the first gap and the second gap, and a middle portion of the conductive sheet is inserted into the limiting gap.

[0023] According to an embodiment of the present invention, the limiting mechanism further comprises a positioning insert rod and a model rod, the positioning insert rod and the model rod are in one-to-one correspondence, and the model rod is installed in the main body cavity;

[0024] A positioning rod mounting groove for mounting the positioning rod is provided on the bottom wall of the main body cavity; a limiting gap for inserting the conductive sheet is formed between the positioning rod and the model rod, and the limiting gap is located between the two mounting gaps;

[0025] Both ends of the conductive sheet are respectively inserted into the two installation gaps, and the middle portion of the conductive sheet is inserted into the limiting gap.

[0026] According to one embodiment of the present invention, the demolding mechanism includes a plurality of ejector rods and a fixed plate, the fixed plate is arranged below the middle template, and the plurality of ejector rods are fixed on the fixed plate. An ejector rod hole that passes through the lower cavity insert is opened on the bottom wall of the main body cavity, and the top end of the ejector rod extends into the ejector rod hole, and the ejector rod is used for demolding.

[0027] According to an embodiment of the present invention, a first surface and a second surface are formed on a side of the positioning insert close to the installation gap. An angle is formed between the first surface and the second surface, and the angle is an obtuse angle.

[0028] According to one embodiment of the present invention, a flow channel groove is opened on the lower surface of the model block 2. When the upper cavity insert is pressed onto the lower cavity insert, the flow channel groove and the flow channel on the model block 1 are connected to form a flow channel cavity.

[0029] Beneficial effects of the utility model:

[0030] The utility model provides an injection mold for a motor brush holder assembly, comprising an upper template, a middle template, an upper cavity insert, a lower cavity insert and a demolding mechanism; the upper surface of the middle template is provided with an installation cavity for installing the lower cavity insert, and the lower surface of the upper template is provided with a cavity for installing the upper cavity insert; the upper surface of the lower cavity insert is provided with a first recessed portion forming a first pattern, and the lower surface of the upper cavity insert is provided with a second recessed portion forming a second pattern, and the first recessed portion and the second recessed portion are fitted together to form an injection cavity with a structure opposite to the outer shape of the brush holder; a limiting mechanism is provided in the first recessed portion, and the limiting mechanism is used to limit the conductive sheet in the motor brush holder assembly so that the conductive sheet is limited in the first recessed portion; the demolding mechanism is located on the side of the middle template away from the upper template, and is used to extend into the first recessed portion to push the brush holder in the first recessed portion out of the first recessed portion.

[0031] First, the conductive sheet is placed within the retaining mechanism, securing it within the first recess. The upper mold plate then moves downward, driving the upper cavity insert to fit onto the upper surface of the lower cavity insert. The first and second recesses align to form an injection cavity with a structure that is the opposite of the brush holder's outer shape. The conductive sheet is then positioned within the cavity, and injection molding is then performed, integrally molding the conductive sheet and brush holder. This eliminates the need for adhesive to secure the conductive sheet to the brush holder, simplifying the process and reducing cycle time, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A first perspective view of the brush holder and conductive sheet after injection molding provided by an embodiment of the present utility model;

[0034] Figure 2 A second perspective view of the brush holder and conductive sheet after injection molding provided by an embodiment of the present utility model;

[0035] Figure 3 A structural diagram of a conductive sheet provided in an embodiment of the present utility model;

[0036] Figure 4 A front view of an injection mold for a motor brush holder assembly provided by an embodiment of the present utility model;

[0037] Figure 5 A structural diagram of the middle mold plate, base and lower cavity insert provided in an embodiment of the present utility model;

[0038] Figure 6 A structural diagram of the upper template and upper cavity insert provided in an embodiment of the present utility model;

[0039] Figure 7 A structural diagram of the lower cavity insert, ejector pin and reset ejector pin provided in an embodiment of the present utility model;

[0040] Figure 8 The embodiment of the present invention provides Figure 7 A top view of

[0041] Figure 9 The embodiment of the present invention provides Figure 8 Enlarged view of part A;

[0042] Figure 10 This is a structural diagram of the lower cavity insert provided by an embodiment of the present utility model after the conductive sheet is removed;

[0043] Figure 11 The embodiment of the present invention provides Figure 10 Enlarged view of part B;

[0044] Figure 12 This is a structural diagram of the lower cavity insert provided by an embodiment of the present utility model after removing the conductive sheet, positioning insert and positioning insert rod;

[0045] Figure 13 The embodiment of the present invention provides Figure 12 Enlarged view of part C;

[0046] Figure 14 A structural diagram of the lower cavity insert provided in an embodiment of the present utility model;

[0047] Figure 15 This is a structural diagram of the positioning insert and positioning insert rod provided in an embodiment of the utility model.

[0048] Icons: 1. Upper template; 101. Slot; 2. Lower cavity insert; 201. Model block one; 202. Runner; 203. Gate; 204. Vertical block; 205. Positioning insert mounting slot; 206. Positioning insert rod mounting slot; 207. Positioning insert rod; 208. Hole body; 210. Ejector rod hole; 211. Missing slot; 3. Base; 4. Fixed plate; 5. Middle template; 6. Upper cavity insert; 601. Model block two; 602. Block body; 7. Ejector rod; 8. Reset ejector rod; 9. Positioning insert; 902. First surface; 903. Second surface; 904. Limit block; 10. Model rod; 11. Conductive sheet; 12. Vertical column; 13. Brush holder; 1301. Slot body; 1302. Through hole; 1303. Round hole. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] In this embodiment, Figure 1 This is a first perspective view of the brush holder 13 and the conductive sheet 11 after injection molding; Figure 2 A second perspective view of the brush holder 13 and the conductive sheet 11 after injection molding; Figure 3 is a structural diagram of the conductive sheet 11; Figure 4 This is a front view of the injection mold for the motor brush holder assembly; Figure 5 It is a structural diagram of the middle template 5, the base 3 and the lower cavity insert 2; Figure 6 It is a structural diagram of the upper template 1 and the upper cavity insert 6; Figure 7 It is a structural diagram of the lower cavity insert 2, the ejector rod 7 and the reset ejector rod 8; Figure 8 for Figure 7 A top view of Figure 9 for Figure 8 Enlarged view of part A; Figure 10 This is a structural diagram of the lower cavity insert 2 after removing the conductive sheet 11; Figure 11 for Figure 10 Enlarged view of part B; Figure 12 This is a structural diagram after removing the conductive sheet 11, the positioning insert 9 and the positioning insert rod 207 from the lower cavity insert 2; Figure 13 for Figure 12 Enlarged view of part C; Figure 14 It is the structural diagram of the lower cavity insert 2; Figure 15 It is a structural diagram of the positioning insert 9 and the positioning insert rod 207.

[0051] like Figures 1-15 As shown, one embodiment of the present invention provides an injection mold for a motor brush holder assembly, comprising an upper template 1, a middle template 5, an upper cavity insert 6, a lower cavity insert 2 and a demoulding mechanism; the upper surface of the middle template 5 is provided with a mounting cavity for mounting the lower cavity insert 2, and the lower surface of the upper template 1 is provided with a cavity for mounting the upper cavity insert 6; the upper surface of the lower cavity insert 2 is provided with a first recessed portion forming a first pattern, and the lower surface of the upper cavity insert 6 is provided with a second recessed portion forming a second pattern, the first recessed portion and the second recessed portion are fitted together to form an injection cavity having an opposite outer structure to the brush holder 13; a limiting mechanism is provided in the first recessed portion, and the limiting mechanism is used to limit the conductive sheet 11 in the motor brush holder assembly so that the conductive sheet 11 is limited to the first recessed portion;

[0052] The demoulding mechanism is located on the side of the middle template 5 away from the upper template 1 and is used to extend into the first recessed portion to push the brush holder 13 in the first recessed portion out of the first recessed portion.

[0053] Before injection molding, the conductive sheet 11 is first placed in the limiting mechanism so that the conductive sheet 11 is fixed in the first recess. Then, the upper mold plate 1 moves downward to drive the upper cavity insert 6 to fit onto the upper surface of the lower cavity insert 2. The first recess and the second recess fit together to form an injection cavity with an opposite shape to the brush holder 13. The conductive sheet 11 is also located in the injection cavity. Then, injection molding is performed to integrally mold the conductive sheet 11 and the brush holder 13. Finally, the brush is connected to the conductive sheet. This eliminates the need to use adhesive to fix the conductive sheet 11 to the brush holder 13, simplifies the processing steps, shortens the cycle, and improves production efficiency.

[0054] As a preferred embodiment, Figure 5 、 Figure 8 and Figure 9 As shown, the first recessed portion includes a circular groove opened on the upper surface of the lower cavity insert 2 and a model block 201 arranged in the circular groove. The model block 201 is centrally arranged in the circular groove. The upper surface of the model block 201 is lower than the upper surface of the lower cavity insert 2, so that a main cavity is formed between the side surface of the model block 201 and the inner wall of the circular groove. The main cavity is part of the injection cavity.

[0055] like Figure 6 As shown, the second recessed portion includes a second mold block 601 having the same shape as the first mold block 201. The projection of the second mold block 601 in the direction of the lower cavity insert 2 coincides with the projection of the first mold block 201. The lower surface of the second mold block 601 is lower than the lower surface of the upper cavity insert 6. It should be noted that the height difference between the upper surface of the first mold block 201 and the upper surface of the lower cavity insert 2 is the same as the thickness of the second mold block 601, that is, the sum of the thickness of the first mold block 201 and the second mold block 601 is the same as the depth of the circular groove. In this way, when the upper cavity insert 6 is attached to the lower cavity insert 2, the lower surface of the second mold block 601 of the upper cavity insert 6 is attached to the upper surface of the first mold block 201 of the lower cavity insert 2, so that the lower surface of the upper cavity insert 6 can be tightly attached to the upper surface of the lower cavity insert 2, thereby forming a complete injection cavity.

[0056] For the sake of convenience, when the upper cavity insert 6 is pressed onto the lower cavity insert 2, the whole formed by the contact between the model block 1 201 and the model block 2 601 is named as an injection mold block. Furthermore, an injection cavity is formed between the side of the injection mold block and the inner wall of the circular groove.

[0057] That is, the injection cavity can be divided into two parts. The first part is the main cavity formed by the side of the model block 201 and the inner wall of the circular groove. The second part is the cavity formed between the side of the model block 2 601 and the inner wall of the circular groove when the model block 201 and the model block 2 601 are in contact.

[0058] The limiting mechanism is installed in the main cavity formed by the side of the model block 1 201 and the inner wall of the circular groove. The conductive sheet 11 is installed in the limiting mechanism. Then the upper cavity insert 6 is pressed onto the lower cavity insert 2 so that the model block 1 201 and the model block 2 601 are in contact, and then injection molding is performed. In this way, the conductive sheet 11 and the brush holder 13 can be formed as one piece.

[0059] Preferably, Figure 9 As shown, the upper surface of the mold block 1 201 is provided with a runner 202 and a gate 203. The gate 203 is connected to the runner 202, and the gate 203 is connected to the main cavity. In this way, the molten plastic flowing into the runner 202 flows along the runner 202 to the gate 203 and then flows out of the gate 203 into the main cavity, thereby filling the entire injection cavity. Figure 6 As shown, a plastic inlet is provided on the upper surface of the upper mold plate 1, extending through the upper mold plate 1. A feed port is provided on the upper cavity insert 6, extending through the second mold block 601. The plastic inlet is connected to the feed port on the upper cavity insert 6. When the upper cavity insert 6 is pressed onto the lower cavity insert 2, the feed port on the upper cavity insert 6 is connected to the runner 202 on the first mold block 201. This allows the molten plastic to flow from the feed port on the upper cavity insert 6 into the runner 202 on the first mold block 201, and thus into the main body cavity. In this embodiment, a single gate 203 is provided, located at one end of the runner 202. Once the molten plastic enters the runner 202, it flows in the direction of the gate 203.

[0060] Optionally, in order to speed up the injection molding rate, a gate 203 can be set at each end of the runner 202, and both gates 203 are connected to the main cavity, so that the molten plastic entering the runner 202 can flow into the main cavity along both ends of the runner 202 at the same time.

[0061] Preferably, Figure 6 As shown, a runner groove is formed on the lower surface of mold block 2 601 . The runner groove corresponds to runner 202 on mold block 1 201 and has the same structure as runner 202. Thus, when upper cavity insert 6 is pressed onto lower cavity insert 2 , the runner groove and runner 202 on mold block 1 201 converge to form a runner cavity. This allows molten plastic from the feed port to flow into the runner cavity and ultimately out of gate 203 into the main body cavity.

[0062] As a preferred embodiment, Figure 9As shown, the limiting mechanism includes two positioning inserts 9, and two positioning insert installation grooves 205 for installing the positioning inserts 9 are opened on the upper surface of the model block 201, and the positioning insert installation grooves 205 are connected to the main body cavity. Figure 11 As shown, when the positioning insert 9 is installed in the positioning insert installation groove 205, an installation gap for the conductive sheet 11 to be inserted is formed between the positioning insert 9 and the positioning insert installation groove 205. Specifically, the two positioning insert installation grooves 205 are arranged in an "eight" shape so that the two ends of the conductive sheet 11 can be smoothly inserted into the two installation gaps.

[0063] That is, when installing the conductive sheet 11, first insert and fix the two positioning inserts 9 into the two positioning insert mounting grooves 205 respectively, forming an installation gap between the positioning inserts 9 and the positioning insert mounting grooves 205, and then insert the two ends of the conductive sheet 11 from top to bottom into the two installation gaps, and at the same time, the middle part of the conductive sheet 11 falls into the main body cavity.

[0064] like Figure 1 As shown, since the brush holder assembly includes two conductive sheets 11, Figure 13 As shown, two limiting mechanisms are provided on the model block 1 201, and four positioning insert mounting grooves 205 are opened on the upper surface of the model block 1 201. The positioning insert mounting grooves 205 in the two limiting mechanisms are symmetrically arranged with respect to the model block 1 201, so that two conductive sheets 11 can be set in the brush holder 13 at the same time.

[0065] Preferably, Figure 13 As shown, a step groove is provided on the inner wall of one side of each positioning insert mounting groove 205. The distance between the step surface of the step groove and the upper surface of the model block 1 201 is the same as the height of the conductive sheet 11, and the step surface is higher than the bottom wall of the main body cavity. That is, when the conductive sheet 11 is inserted into the mounting gap, the lower surface of the conductive sheet 11 contacts the step surface, the upper surface of the conductive sheet 11 is flush with the upper surface of the model block 1 201, and the lower surface of the conductive sheet 11 is higher than the bottom wall of the main body cavity. This arrangement has two advantages. First, it ensures that during injection molding, the middle part of the conductive sheet 11 can be completely wrapped in the brush holder 13, and the wrapped part of the conductive sheet 11 will not be exposed to the outside world, so that the conductive sheet 11 is not easy to fall off from the brush holder 13. Second, the step surface plays the role of supporting the conductive sheet 11, so that the middle part of the conductive sheet 11 can be suspended in the air, thereby improving the stability when the conductive sheet 11 is placed.

[0066] The existing conductive sheet 11 is as follows Figure 3As shown, the conductive sheet 11 includes a first end, a middle part and a second end connected in sequence, wherein the first end and the second end are exactly the same, and the first end and the second end both include a first plate and a second plate connected in sequence, one end of the first plate is connected to the second plate, and the other end of the second plate is connected to one end of the middle part of the conductive sheet 11, the length of the first plate is less than the length of the second plate, and an angle is formed between the first plate and the second plate, which is an obtuse angle.

[0067] Preferably, Figure 15 As shown, the positioning insert 14 is formed with a first surface 902 and a second surface 903 connected to each other on one side close to the table groove, wherein the width of the first surface 902 is greater than the width of the second surface 903, and an angle is formed between the first surface 902 and the second surface 903, which is the same as the angle formed between the first plate and the second plate. Figure 13 As shown, a third and fourth surfaces are formed on the inner wall of one side of the positioning insert mounting groove 205. The third surface is longer than the fourth surface, and the third surface is connected to the side of the model block 1 201. The angle between the third and fourth surfaces is the same as the angle formed between the first plate and the second plate. When the positioning insert 14 is installed in the positioning insert mounting groove 205, the first surface 902 of the positioning insert 9 is parallel to the third surface in the positioning insert mounting groove 205, while the second surface 903 of the positioning insert 9 is parallel to the fourth surface in the positioning insert mounting groove 205. The distance between the first surface 902 of the positioning insert 9 and the third surface in the positioning insert mounting groove 205 is the same as the distance between the second surface 903 of the positioning insert 9 and the fourth surface in the positioning insert mounting groove 205. That is, the width of the installation gap remains constant from one end to the other. This arrangement can ensure that the conductive sheet 11 can be smoothly inserted into the installation gap, and the width of the installation gap is slightly larger than the conductive sheet 11 so as to stably limit the conductive sheet 11.

[0068] Specifically, the thickness of the conductive sheet 11 is 0.15mm, and the distance between the first surface 902 of the positioning insert 9 and the third surface in the positioning insert mounting groove 205 is 0.15mm-0.155mm, and the distance between the second surface 903 of the positioning insert 9 and the fourth surface in the positioning insert mounting groove 205 is 0.15mm-0.155mm.

[0069] It should be noted that since the thicknesses of different conductive sheets 11 are slightly different, the thickness of the positioning insert 9 can be appropriately reduced to adjust the distance between the first surface 902 of the positioning insert 9 and the third surface in the positioning insert mounting groove 205, as well as the distance between the second surface 903 of the positioning insert 9 and the fourth surface in the positioning insert mounting groove 205. That is, the width of the installation gap can be adjusted by appropriately reducing the thickness of the positioning insert 9 to adapt to conductive sheets 11 of different thicknesses.

[0070] Optional, such as Figure 15 As shown, a limit block 904 is provided at the bottom of the second surface 903 of the positioning insert 9. The limit block 904 is a rectangular block. Figure 14 As shown, in order to facilitate the installation of the positioning insert 9, a groove is opened on the lower surface of the lower cavity insert 2, and the groove is connected to the positioning insert installation groove 205. In this way, when the positioning insert 9 is inserted into the positioning insert installation groove 205 from bottom to top, the limit block 904 will fit into the groove, and glue is evenly applied on the upper surface of the limit block 904, so that the positioning insert 9 can be quickly installed in the positioning insert installation groove 205.

[0071] Optionally, a through hole is provided on the limit block 904, and a screw hole is opened on the inner top wall of the groove, so that after the limit block 904 is fitted into the groove, the positioning insert 9 can be quickly fixed to the positioning insert mounting groove 205 by screws, which is convenient for subsequent disassembly and replacement.

[0072] Preferably, Figure 9 、 Figure 11 and Figure 13 As shown, in order to better and more stably limit the conductive sheet 11, a positioning insert rod 207 and a model rod 10 are provided in the main body cavity, and the positioning insert rod 207 and the model rod 10 correspond one to one. Specifically, the model rod 10 is a semi-cylinder, and the model rod 10 and the lower cavity insert 2 are integrally formed. A positioning insert rod mounting groove 206 for mounting the positioning insert rod 207 is provided on the bottom wall of the main body cavity near the model rod 10. The cross section of the positioning insert rod mounting groove 206 is semi-circular, and the positioning insert rod 207 is semi-cylindrical. A limiting gap for inserting the conductive sheet 11 is formed between the side plane of the positioning insert rod 207 and the side plane of the model rod 10. Furthermore, the limiting gap is located in the main body cavity between the two mounting gaps;

[0073] In this way, when the conductive sheet 11 is inserted from top to bottom, the two ends of the conductive sheet 11 are respectively inserted into the two installation gaps, and the middle part of the conductive sheet 11 is inserted into the limiting gap. This can better limit the conductive sheet 11, prevent the conductive sheet 11 from shaking, and improve the injection molding effect.

[0074] In addition, it should be noted that a connection hole is provided in the middle portion of the conductive sheet 11 , and the connection hole is used to connect a wire. Figure 2 The brush holder 13 and conductive sheet 11 are formed by casting. The two connection holes on the two conductive sheets 11 are used to connect the positive and negative leads, respectively. Furthermore, two U-shaped notches are formed on the brush holder 13. The connection holes of the conductive sheets 11 are located within these U-shaped notches. A groove 1301 is formed directly above these two U-shaped notches. This groove 1301 is the corresponding position of the positioning insert rod 207 and the mold rod 10.

[0075] Optionally, the limiting mechanism includes a gap structure provided on model block 1 201, the gap structure including a first gap and a second gap, both of which are connected to the main body cavity, and the first gap and the second gap are arranged in a figure-eight pattern. When the conductive sheet 11 is inserted into the gap structure, the ends of the conductive sheet 11 are respectively inserted into the first gap and the second gap, and the middle portion of the conductive sheet 11 is located within the main body cavity. Furthermore, two gap structures are provided, and the two gap mechanisms are symmetrically arranged about model block 1 201 to limit the two conductive sheets 11.

[0076] When installing the conductive sheet 11 , both ends of the conductive sheet 11 are respectively inserted into the first gap and the second gap from top to bottom, while the middle portion of the conductive sheet 11 is located in the main body cavity.

[0077] Furthermore, a step groove is provided on one inner wall of the first gap and the second gap, and the lower surface of the conductive sheet 11 rests on the step surface so that the middle part of the conductive sheet 11 is suspended in the main cavity.

[0078] Furthermore, a positioning rod 207 and a mold rod 10 are provided within the main cavity. The mold rod 10 is a semi-cylindrical structure and is integrally formed with the lower mold cavity insert 2. A positioning rod mounting groove 206 for mounting the positioning rod 207 is provided on the bottom wall of the main cavity near the mold rod 10. The cross-section of the positioning rod mounting groove 206 is semi-circular. The positioning rod 207 is a semi-cylindrical structure. A limiting gap is formed between the side planes of the positioning rod 207 and the side planes of the mold rod 10 for inserting the conductive sheet 11. The limiting gap is located within the main cavity between the two first gaps and the second gap.

[0079] In this way, when the conductive sheet 11 is inserted from top to bottom, both ends of the conductive sheet 11 are respectively inserted into the first gap and the second gap, while the middle portion of the conductive sheet 11 is inserted into the limiting gap.

[0080] Preferably, Figure 15 As shown, the bottom position of the side plane of the positioning rod 207 is integrally formed with a bottom block. Figure 14 A groove is opened on the lower surface of the lower cavity insert 2, which is connected to the positioning insert rod installation groove 206. When installing the positioning insert rod 207, glue is first applied to the upper surface of the bottom block, and then the positioning insert rod 207 is inserted into the positioning insert rod installation groove 206 from bottom to top until the upper surface of the bottom block fits with the inner top wall of the groove, until the upper surface of the bottom block and the inner top wall of the groove are firmly bonded.

[0081] As a preferred embodiment, Figure 1As shown, the injection mold of the motor brush holder assembly also includes a base 3, a middle template 5 is installed on the upper surface of the base 3, a cavity is formed below the base 3 and the demoulding mechanism is installed in the cavity.

[0082] Further, such as Figure 4 and Figure 7 As shown, the demoulding mechanism includes multiple ejector rods 7, reset ejector rods 8 and a fixed plate 4. The fixed plate 4 is arranged in the cavity below the middle template 5 and is slidably connected to the inner wall of the base 3. The multiple ejector rods 7 and reset ejector rods 8 are fixed to the fixed plate 4. Specifically, the reset ejector rod 8 is fixed in the center of the fixed plate 4, and the multiple ejector rods 7 are evenly arranged around the multiple reset ejector rods 8. Figure 9 、 Figure 11 and Figure 13 As shown, multiple ejector pin holes 210 are evenly distributed within the main body of mold block 1 201, corresponding one-to-one with the ejector pins 7. These ejector pin holes 210 are circular and extend through mold block 1 201 . The top ends of the ejector pins 7 are inserted into these ejector pin holes 210 . A hole 208 is provided in the middle of mold block 1 201 , into which the reset ejector pin 8 extends.

[0083] Because the upper surface of mold block 1 201 is higher than the inner bottom wall of the main body cavity, in this embodiment, the length of the reset push rod 8 is slightly longer than the length of the ejector rod 7. This ensures that when the upper surface of the ejector rod 7 is flush with the inner bottom wall of the main body cavity, the upper surface of the reset push rod 8 is also flush with the upper surface of mold block 1 201. This ensures that the structure of the injection-molded brush holder 13 is not affected.

[0084] It should be noted that, in the initial state, the upper surface of the ejector rod 7 is flush with the inner bottom wall of the main cavity, and the upper surface of the reset ejector rod 8 is flush with the upper surface of the mold block 1 201. After the injection molding is completed and the mold needs to be demolded, the telescopic member of the injection molding machine pushes the fixed plate 4 to continue to move upward, thereby driving multiple ejector rods 7 to simultaneously extend out of the ejector rod holes 210 to push the molded brush holder 13 out of the main cavity. Since the telescopic member only pushes the fixed plate 4 from the lower surface and is not connected to the fixed plate 4, when the mold is demolded, the telescopic member retracts, and the upper mold plate 1 drives the upper cavity insert 6 downward. The lower surface of the upper cavity insert 6 presses on the upper surface of the reset ejector rod 8 to push the fixed plate 4 downward to the initial state. At the same time, the multiple ejector rods 7 move downward as the fixed plate 4 moves downward, and finally the upper surface of the ejector rod 7 is once again flush with the inner bottom wall of the main cavity, and the upper surface of the reset ejector rod 8 is once again flush with the upper surface of the mold block 1 201.

[0085] In addition, the diameter of the feed port on the second model block 601 is smaller than the diameter of the hole body 208, that is, the diameter of the feed port on the second model block 601 is smaller than the diameter of the reset ejector pin 8. In this way, when the upper template 1 drives the upper cavity insert 6 to move downward, the top end of the reset ejector pin 8 does not extend into the feed port on the second model block 601. The reset ejector pin 8 only contacts the lower surface of the second model block 601, thereby pressing the reset ejector pin 8 downward.

[0086] Optional, such as Figure 1 and Figure 2 As shown, the two sides of the brush holder 13 have two through holes 1302, and the two through holes 1302 are in the shape of straight slots. Figure 9 As shown, two vertical blocks 204 are symmetrically provided in the main body cavity to match the through hole 1302. Figure 1 As shown, there are two circular holes 1303 on one side of the brush holder 13. The two circular holes 1303 are located at a through hole 1302 on the right side of the brush holder 13, and the two circular holes 1303 are symmetrically arranged about the through hole 1302. Figure 9 As shown, two columns 12 are provided on the bottom wall of the main body cavity. The columns 12 are close to a vertical block 204 and are symmetrical about the vertical block 204 .

[0087] Optional, such as Figure 5 , a cylinder is provided at each of the four corners of the top of the middle template 5, such as Figure 6 As shown, a slot 101 adapted to the cylinder is opened at each of the four corners of the bottom of the upper template 1. The cylinder and the slot 101 cooperate to play a positioning role. When the upper template 1 moves downward, if the four cylinders can just be inserted into the four slots 101, it means that there is no deviation in the position.

[0088] Optional, such as Figure 7 As shown, a notch 211 is provided at each of the four corners of the top of the lower cavity insert 2. Figure 6 As shown, a block 602 matching the defective groove 211 is provided at each of the four corners of the bottom of the upper cavity insert 6. The thickness of the block 602 is the same as the depth of the defective groove 211. When the upper cavity insert 6 and the lower cavity insert 2 are fitted together, the block 602 can just be aligned and fitted into the defective groove 211. If the position of the upper cavity insert 6 and the lower cavity insert 2 is offset, the block 602 cannot just be aligned and fitted into the defective groove 211, thereby achieving a positioning effect.

[0089] In the description of this utility model, it should be noted that the terms "upper" and "lower" and other terms 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 utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0090] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motor brush holder assembly injection mold, characterized in that: It comprises an upper mold plate (1), a middle mold plate (5), an upper mold cavity insert (6), a lower mold cavity insert (2) and a demoulding mechanism; The upper surface of the middle template (5) is provided with a mounting cavity for mounting the lower cavity insert (2), and the lower surface of the upper template (1) is provided with a cavity for mounting the upper cavity insert (6); The upper surface of the lower cavity insert (2) is provided with a first recessed portion forming a first pattern, and the lower surface of the upper cavity insert (6) is provided with a second recessed portion forming a second pattern, and the first recessed portion and the second recessed portion are fitted together to form an injection cavity having an outer structure opposite to that of the brush holder (13); A limiting mechanism is provided in the first recessed portion, and the limiting mechanism is used to limit the conductive sheet in the motor brush holder assembly so that the conductive sheet is limited in the first recessed portion; The demoulding mechanism is located on a side of the middle template (5) away from the upper template (1), and is used to extend into the first recessed portion to push the brush holder (13) in the first recessed portion out of the first recessed portion.

2. The motor brush holder assembly injection mold according to claim 1, characterized in that: The first recessed portion comprises a circular groove formed on the upper surface of the lower cavity insert (2) and a model block (201) disposed in the circular groove, a main body cavity being formed between the side surface of the model block (201) and the inner wall of the circular groove, and the upper surface of the model block (201) is lower than the upper surface of the lower cavity insert (2); The second recessed portion includes a model block 2 (601) having the same outer shape as the model block 1 (201), the lower surface of the model block 2 (601) is lower than the lower surface of the upper cavity insert (6), the projection of the model block 2 (601) in the direction of the lower cavity insert (2) coincides with the model block 1 (201), and the height difference between the upper surface of the model block 1 (201) and the upper surface of the lower cavity insert (2) is the same as the thickness of the model block 2 (601); When the upper cavity insert (6) is pressed onto the lower cavity insert (2), the model block 1 (201) and the model block 2 (601) come into contact to form an injection mold block, and the injection cavity is formed between the side surface of the injection mold block and the inner wall of the circular groove; The upper surface of the model block 1 (201) is provided with a flow channel (202), and the flow channel (202) is connected to the main cavity. The upper cavity insert (6) is provided with a feed port that passes through the model block 2 (601). When the upper cavity insert (6) is pressed onto the lower cavity insert (2), the feed port is connected to the flow channel (202).

3. The motor brush holder assembly injection mold according to claim 2, characterized in that: The limiting mechanism includes a gap structure provided on the model block 1 (201), the gap structure includes a first gap and a second gap, the first gap and the second gap are both connected to the main body cavity, and the first gap and the second gap are distributed in an eight-shaped shape, when the conductive sheet is inserted into the gap structure, the two ends of the conductive sheet are respectively inserted into the first gap and the second gap, and the middle part of the conductive sheet is located in the main body cavity.

4. The motor brush holder assembly injection mold according to claim 3, characterized in that: There are two gap structures, and the two gap structures are symmetrically arranged with respect to the model block 1 (201).

5. The motor brush holder assembly injection mold according to claim 2, characterized in that: The limiting mechanism includes a positioning insert (9), and the upper surface of the model block (201) is provided with a positioning insert installation groove (205) for installing the positioning insert (9), the positioning insert installation groove (205) is connected to the main body cavity, and an installation gap for inserting the conductive sheet is formed between the positioning insert (9) and the positioning insert installation groove (205); Two of the positioning inserts (9) and the positioning insert installation grooves (205) are provided to form two installation gaps, and the two positioning insert installation grooves (205) are distributed in an eight-shaped pattern.

6. The motor brush holder assembly injection mold according to claim 3, characterized in that: The limiting mechanism further comprises a positioning insert rod (207) and a model rod (10), wherein the positioning insert rod (207) and the model rod (10) correspond one to one, and the model rod (10) is installed in the main body cavity; A positioning rod mounting groove (206) for mounting the positioning rod (207) is provided on the bottom wall of the main body cavity; a limiting gap for inserting the conductive sheet is formed between the positioning rod (207) and the model rod (10), and the limiting gap is located between the first gap and the second gap; Two ends of the conductive sheet are respectively inserted into the first gap and the second gap, and a middle portion of the conductive sheet is inserted into the limiting gap.

7. The motor brush holder assembly injection mold according to claim 5, characterized in that: The limiting mechanism further comprises a positioning insert rod (207) and a model rod (10), wherein the positioning insert rod (207) and the model rod (10) correspond one to one, and the model rod (10) is installed in the main body cavity; A positioning rod mounting groove (206) for mounting the positioning rod (207) is provided on the bottom wall of the main body cavity; a limiting gap for inserting the conductive sheet is formed between the positioning rod (207) and the model rod (10), and the limiting gap is located between the two mounting gaps; Both ends of the conductive sheet are respectively inserted into the two installation gaps, and the middle portion of the conductive sheet is inserted into the limiting gap.

8. The motor brush holder assembly injection mold according to claim 2, characterized in that: The demoulding mechanism comprises a plurality of ejector rods (7) and a fixed plate (4), wherein the fixed plate (4) is arranged below the middle mold plate (5), and the plurality of ejector rods (7) are fixed on the fixed plate (4). A ejector rod hole (210) penetrating the lower mold insert (2) is provided on the bottom wall of the main cavity, and the top end of the ejector rod (7) extends into the ejector rod hole (210), and the ejector rod (7) is used for demoulding.

9. The motor brush holder assembly injection mold according to claim 5, characterized in that: The positioning insert (9) is formed with a first surface and a second surface connected to each other on one side close to the installation gap, and an angle is formed between the first surface and the second surface, and the angle is an obtuse angle.

10. The motor brush holder assembly injection mold according to claim 2, characterized in that: A flow channel groove is provided on the lower surface of the model block 2 (601). When the upper cavity insert (6) is pressed onto the lower cavity insert (2), the flow channel groove and the flow channel (202) on the model block 1 (201) are connected to form a flow channel cavity.

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