Mica-free copper bar positioning plastic core

Abstract

A mica-free copper bar positioning plastic core comprises a cylindrical core, flanges are arranged on the peripheral surface of the cylindrical core at equal intervals, a groove is formed between every two adjacent flanges, the grooves and the cross section structures of the roots of commutator segments in a commutator are positioned in a matched mode, connecting strips are arranged at the bottom ends of the flanges, and the connecting strips are arranged in the grooves and used for connecting the two adjacent flanges. Positioning nodes are formed between the connecting strips and the outer peripheral surface of the cylindrical core, and the positioning nodes are used for inserting part of roots of the commutator segments and preventing the commutator segments from being separated after being inserted. According to the utility model, the connecting strips provide lower support for the root parts of the commutator segments, and are matched with the cylindrical core to form positioning nodes providing a limiting effect, so that the commutator segments are prevented from falling off after being combined with the root parts of the commutator segments, the stability of the commutator segments arranged on the cylindrical core is improved, and the service life of the commutator segments is prolonged. And the problems that the plastic core needs to be kept in a specific state during transfer and the commutator segments are separated from the grooves along the direction deviating from the assembly direction due to vibration after landing are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary tooling for commutator production, in particular to a mica-free copper bar positioning plastic core. Background Art

[0002] The commutator is the main component of the motor. It is mainly composed of an inner sleeve, a bakelite body outside the inner sleeve, and copper commutator segments arranged outside the bakelite body. The commutator segments are punched out of copper material, and the number of segments varies depending on the design of the commutator.

[0003] Publication number CN206806690U discloses a commutator segment plastic core, including a cylindrical core, the outer circumference of the cylindrical core is provided with equally spaced flanges and grooves, the grooves are positioned in coordination with the cross-sectional structure of the root of the commutator segment in the commutator, and one end of the cylindrical core is provided with a limit plate, the outer diameter of the limit plate is smaller than the outer diameter surrounded by the commutator segments and larger than the outer diameter surrounded by the flanges. This plastic core tooling is used to solve the problem of low production efficiency caused by fixing with rubber bands after arranging the segments. The main method is to set a limit plate on the cylindrical core, so that the commutator segments installed on the cylindrical core can obtain lower support, and the installation structure of the flange and the groove is combined to ensure the stability of the commutator segments on the cylindrical core, thereby eliminating the process of winding and tightening the fasteners. However, there is a defect that the lower support only produces a limiting force to prevent the commutator segments entering the groove from sliding downward, and lacks a limiting force to escape in the direction away from the assembly. Considering that setting the commutator segments on the plastic core is only one step, the plastic core needs to be transferred to the next equipment for the next processing after the commutator segments are set. During transportation, the plastic core with the commutator segments set needs to be placed in a placement box, and the limit plate is kept at the lower end of the commutator segments, resulting in a cumbersome transportation process. In addition, there is a risk of the placement box falling to the ground during transportation. After landing, it will vibrate and cause the commutator segments to escape from the groove in the direction away from the assembly, thereby failing to truly ensure the stability of the commutator segments. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provides a mica-free copper busbar positioning plastic core to solve the above-mentioned problems.

[0005] The utility model adopts a technical solution to solve the technical problem: the mica-free copper bar positioning plastic core comprises a cylindrical core, the outer peripheral surface of the cylindrical core is provided with flanges at equal intervals, a groove is formed between two adjacent flanges, the groove is coordinated with the cross-sectional structure of the root of the commutator segment in the commutator for positioning, the bottom end of the flange is provided with a connecting strip placed in the groove and used to connect the two adjacent flanges, a positioning node is formed between the connecting strip and the outer peripheral surface of the cylindrical core, the positioning node is for part of the root of the commutator segment to be inserted into, and the commutator segment is prevented from falling out after being inserted.

[0006] Further improvement, the inner circumference of the flange is fixed on the outer circumference of the cylindrical core, the outer circumference is used to contact the inner circumference of the commutator segment and has an arc shape matching the inner circumference of the commutator segment.

[0007] Further improvement, the width of the flange gradually widens from the inner circumference to the outer circumference.

[0008] Further improvement, both side surfaces of the flange are provided with extension sections extending from the outer peripheral surface, and are used as limiting structures to prevent the root of the commutator segment from escaping when the root of the commutator segment is placed in the groove.

[0009] Further improvement, the inner circumference of the extension section is in contact with the outer circumference of the connecting strip.

[0010] Further improvement, the positioning node includes an enclosing wall formed in the groove, and an insertion space defined within the enclosing wall for the root of the commutator segment to be inserted therein, and the enclosing wall contacts the root when the root of the commutator segment is placed in the insertion space.

[0011] For further improvement, a slot for inserting the connecting strip is provided at the lower end of the root of the commutator segment.

[0012] The beneficial effects of the utility model are:

[0013] The utility model provides lower support for the root of the commutator segment through a connecting strip, and cooperates with the cylindrical core to form a positioning node that provides a limiting effect, so as to prevent the commutator segment from falling out after being combined with the root of the commutator segment, thereby increasing the stability of the commutator segment set on the cylindrical core, and also solving the problem that the plastic core needs to maintain a specific state during transportation, and the commutator segment will fall out of the groove in a direction away from the assembly direction due to vibration after landing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the cylindrical core of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the commutator segment of the utility model being arranged on a cylindrical core;

[0016] Figure 3 It is a structural schematic diagram of the commutator segment of the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Referring to the accompanying drawings: This mica-free copper bar positioning plastic core includes a cylindrical core 1, and the outer circumferential surface of the cylindrical core 1 is provided with equally spaced flanges 11, and a groove 12 is formed between two adjacent flanges 11. The groove 12 is positioned in coordination with the cross-sectional structure of the root of the commutator segment 2 in the commutator. The bottom end of the flange 11 is provided with a connecting strip 3 placed in the groove 12 and used to connect the two adjacent flanges 11. A positioning node 4 is formed between the connecting strip 3 and the outer circumferential surface of the cylindrical core 1. The positioning node 4 is for inserting part of the root of the commutator segment 2 and preventing the commutator segment 2 from falling out after insertion. The principle of the utility model is that an installation space for the commutator segment 2 to be placed therein is formed by the flange 11 and the groove 12, and the connecting strip 3 plays a role of lower support to prevent the commutator segment entering the groove from sliding downward, and the function of the connecting strip 3 is not only the lower support, but also can cooperate with the cylindrical core 1 to use part of the groove 12 as a positioning node 4. The purpose of the positioning node 4 is to provide a limiting effect and prevent the commutator segment 2 from falling out after combining with the root of the commutator segment 2, thereby increasing the stability of the commutator segment 2 set on the cylindrical core 1, thereby solving the problem that the plastic core needs to maintain a specific state during transportation and the commutator segment 2 will fall out of the groove 12 in the direction away from the assembly due to vibration after landing.

[0019] The inner circumference of the flange 11 is fixed on the outer circumference of the cylindrical core 1. The outer circumference is used to contact the inner circumference of the sheet portion of the commutator segment 2 and has an arc shape that matches the inner circumference of the commutator segment 2. Such a setting not only facilitates the formation of the flange 11 on the cylindrical core 1, but also can eliminate the gap between the two when in contact with the commutator segment 2, so that the sheet portion of the commutator segment 2 can fit on the flange 11 to achieve gathering, thereby ensuring the overall structural integrity of the finished product.

[0020] The width of the flange 11 gradually widens from the inner circumference to the outer circumference. Since the flanges 11 are arranged in a circular array with the center of the cylindrical core 1 as the center, there is an angle difference between adjacent flanges 11. Considering that the root of the commutator segment 2 is in a rectangular configuration, an obvious gap is generated after the root enters the groove 12 due to the angle difference. The gap will affect the stability. Therefore, the flange 11 is arranged in this way to make the groove 12 in a rectangular configuration to adapt to the configuration of the root.

[0021] Extension sections 11-a extending from the outer peripheral surface are provided on both side surfaces of the flange 11, and are used as limiting structures to prevent the root of the commutator segment 2 from escaping when the root of the commutator segment 2 is placed in the groove 12. The extension section 11-a forms a barrier on the flange 11, which is also used to prevent the root of the commutator segment 2 from escaping from the groove 12, so as to ensure the stability of the root of the commutator segment 2 in the groove 12.

[0022] The inner circumference of the extension section 11-a fits with the outer circumference of the connecting strip 3. By increasing the contact surface, the connecting strip 3 is not only connected to the flange 11, but also to the extension section 11-a, thereby increasing the structural stability of the connecting strip 3 on the flange 11 and preventing it from breaking.

[0023] The positioning node 4 includes an enclosing wall 41 formed in the groove 12, and an insertion space 42 defined within the enclosing wall 41 and for the root of the commutator segment 2 to be inserted therein. The enclosing wall 41 contacts the root when the root of the commutator segment 2 is placed in the insertion space 42. Such a setting allows the root of the commutator segment 2 to be placed in a defined space, namely the insertion space 42. The enclosing wall 41 contacts the root and generates a certain squeezing force. The squeezing force can generate resistance to prevent the root from escaping, thereby ensuring the stability of the root of the commutator segment 2 in the positioning node 4, and also ensuring the stability of the commutator segment 2 set on the cylindrical core 1.

[0024] The lower end of the root of the commutator segment 2 is provided with a slot 21 for the connecting strip 3 to be inserted therein. This arrangement enables the roots of the commutator segments 2 to be plugged into each other after entering the positioning node 4, that is, the connecting strip 3 is inserted into the slot 21, thereby further increasing the resistance to prevent the roots from coming out.

[0025] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A mica-free copper bar positioning plastic core, comprising a cylindrical core (1), the outer peripheral surface of the cylindrical core (1) is provided with flanges (11) at equal intervals, a groove (12) is formed between two adjacent flanges (11), the groove (12) cooperates with the cross-sectional structure of the root of the commutator segment (2) in the commutator for positioning, characterized in that: The bottom end of the flange (11) is provided with a connecting strip (3) placed in the groove (12) and used to connect two adjacent flanges (11), and a positioning node (4) is formed between the connecting strip (3) and the outer peripheral surface of the cylindrical core (1), and the positioning node (4) allows a part of the root of the commutator segment (2) to be inserted into it and prevents the commutator segment (2) from falling out after insertion.

2. The mica-free copper busbar positioning plastic core according to claim 1, characterized in that: The inner circumference of the flange (11) is fixed to the outer circumference of the cylindrical core (1), and the outer circumference is used to contact the inner circumference of the commutator segment (2) and has an arc shape that matches the inner circumference of the commutator segment (2).

3. The mica-free copper busbar positioning plastic core according to claim 2, characterized in that: The width of the flange (11) gradually increases from the inner peripheral surface to the outer peripheral surface.

4. The mica-free copper busbar positioning plastic core according to claim 2, characterized in that: Extension sections (11-a) extending from the outer peripheral surface are provided on both side surfaces of the flange (11) and serve as limiting structures for preventing the root of the commutator segment (2) from coming out when the root of the commutator segment (2) is placed in the groove (12).

5. The mica-free copper busbar positioning plastic core according to claim 4, characterized in that: The inner circumferential surface of the extension section (11-a) fits in with the outer circumferential surface of the connecting strip (3).

6. The mica-free copper busbar positioning plastic core according to claim 1, characterized in that: The positioning node (4) comprises an enclosing wall (41) formed in the groove (12), and an insertion space (42) defined within the enclosing wall (41) and for the root of the commutator segment (2) to be inserted therein, wherein the enclosing wall (41) contacts the root when the root of the commutator segment (2) is placed in the insertion space (42).

7. The mica-free copper busbar positioning plastic core according to claim 6, characterized in that: The lower end of the root of the commutator segment (2) is provided with a slot (21) for the connecting strip (3) to be inserted therein.

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