Brush holder riveting structure and riveting method

Abstract

The invention discloses a brush holder riveting structure and a riveting method, the brush holder riveting structure comprises a brush holder and a mounting plate, the brush holder comprises a brush holder body and one or more brush holder feet fixed with the brush holder body, and one end, far away from the brush holder body, of each brush holder foot is provided with a torsion part. The mounting plate is provided with a through groove allowing the brush holder foot to penetrate through, the torsion part extends out of the through groove and is twisted so that the mounting plate can be pressed between the torsion part and the brush holder body, the end face of the torsion part is lower than that of the mounting plate, and the through groove is suitable for locally and circumferentially limiting the brush holder foot so that torsional deformation of the torsion part can be kept in the through groove. According to the brush holder riveting structure and the riveting method, the defects of brush holder riveting in the market are overcome, the deformation amount of the brush holder is structurally limited, and conduction between the brush holder and the outside is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of motor design, and in particular to a brush holder riveting structure and a riveting method. Background Art

[0002] With the increasing number of brushed DC motor applications, customers have higher requirements for motor reliability. The brush holder is a key component installed on the motor, and its stability and fastening directly affect the operation of the motor.

[0003] In a large number of practices and experiments, it was found that the brush holders on the market were loose during work and the deformation of the brush holders was too large during the riveting process, which caused the motor to burn out and shut down. For example, in the carbon brush structure described in patent CN214124284U, the rivet feet pass through the holes on the bottom plate and then bend to fit tightly against the bottom plate to achieve the installation and fixation of the brush holder and the bottom plate. During the bending of the rivet feet and the subsequent use of the carbon brush, the brush holder is prone to unstable installation and looseness.

[0004] The carbon brush structure described in patent CN211958938U fixes the brush holder to the end cover by twisting the brush holder foot, but the end cover is fixed between the fixed section and the rotating section of the brush holder. When the rotating section is twisted, the torsional force will be transmitted to the fixed section, causing the fixed section and even the brush holder body to partially twist, causing the brush holder to deform, thereby causing the carbon brush to be unable to be installed normally, affecting the operation of the motor, and the rotating section in the structure protrudes from the surface of the end cover, shortening the electrical distance between the charged part and other conductors, which is more likely to cause a short circuit.

[0005] Therefore, how to design a brush holder riveting structure that is structurally stable, highly safe and avoids deformation of the brush holder during installation is a technical problem that needs to be solved at present. Summary of the invention

[0006] In order to solve the technical problems in the prior art that the brush holder riveting structure is very likely to cause the brush holder to be unstable and loose in installation, or easily cause the brush holder to be twisted and deformed, the present invention provides a brush holder riveting structure and a riveting method to solve the above problems.

[0007] The present invention solves and proposes a brush holder riveting structure, comprising a brush holder and a mounting plate, wherein the brush holder comprises a brush holder body and one or more brush holder feet fixed to the brush holder body, wherein one end of the brush holder foot away from the brush holder body has a torsion portion.

[0008] The mounting plate has a through slot for the brush holder to pass through, the torsion portion extends out of the through slot and twists so that the mounting plate is pressed between the torsion portion and the brush holder body, and the end face height of the torsion portion is lower than the end face height of the mounting plate, and the through slot is suitable for local circumferential limitation of the brush holder foot so that the torsional deformation of the torsion portion is kept within the through slot.

[0009] Furthermore, a groove is provided at one end of the mounting plate facing away from the brush holder body, the through groove is located at the groove, and the height of the torsion portion is smaller than the height of the groove.

[0010] Furthermore, the mounting plate includes a brush holder and a bottom plate fixed to each other, the bottom plate is located between the brush holder and the brush handle, and the through groove includes a first through hole located on the bottom plate and a second through hole located on the brush holder.

[0011] Furthermore, the torsion angle of the torsion portion is 15° to 45°.

[0012] Furthermore, the brush holder foot also includes a fixed part and a yoke part. The brush holder body, the fixed part, the yoke part and the torsion part are connected in sequence. The cross-sectional size of the yoke part is smaller than the cross-sectional size of the fixed part and the torsion part, so that after the torsion part is twisted, the yoke part forms a torsional deformation zone.

[0013] Furthermore, the cross-sectional dimension of the first through hole is smaller than the cross-sectional dimension of the second through hole, and the fixing portion cooperates with the first through hole for circumferential limitation.

[0014] Furthermore, before the torsion portion is twisted, an end face of the torsion portion connected to the yoke portion is located in the through slot, and a distance h between the end face and the end face of the through slot where the torsion portion is located is 0.20 mm to 0.31 mm.

[0015] Furthermore, the through groove is a rectangular groove having the same cross-section as the brush grip foot.

[0016] Furthermore, the brush holder is made of plastic material, and the brush handle is made of metal material.

[0017] Furthermore, one end of the twisting portion away from the brush holder is provided with a chamfer.

[0018] The present invention further provides a riveting method, which adopts the brush holder riveting structure described above and comprises the following steps:

[0019] S1: Pass the brush holder foot through the through slot from the front side of the mounting plate until the brush holder body contacts the surface of the mounting plate.

[0020] S2: Twisting the twisted portion so that the twisted portion abuts against the back surface of the mounting plate.

[0021] Furthermore, in step S1, one end of the torsion portion is located in the through groove; in step S2, after the torsion portion is twisted, the surface of the mounting plate contacting the torsion portion has a common deformation zone that deforms together with the brush grip foot.

[0022] The beneficial effects of the present invention are:

[0023] (1) The brush holder riveting structure and riveting method of the present invention overcome the shortcomings of brush holder riveting on the market, structurally limit the deformation of the brush holder, and effectively prevent the brush holder from being electrically connected to the outside.

[0024] (2) The present invention takes into account the bending effect of the brush holder and provides a yoke with a smaller cross-sectional size on the brush holder foot, thereby forming a notch between the fixed portion and the torsion portion, which is conducive to torsional deformation and has a simple structure, thereby greatly improving the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 is a front perspective view of the brush holder riveting structure of the present invention;

[0027] Figure 2 is a back perspective view of the brush holder riveted structure of the present invention when the brush holder foot is not twisted;

[0028] Figure 3 is an exploded view of the brush holder riveted structure of the present invention;

[0029] Figure 4 is a three-dimensional diagram of the brush holder of the present invention (the twisting portion is not twisted);

[0030] Figure 5 is a back perspective view of the brush holder riveted structure of the present invention after the brush holder foot is twisted;

[0031] Figure 6 1. It is a schematic diagram of the connection relationship between the brush grip and the base plate after twisting;

[0032] Figure 7 is a three-dimensional diagram of the bottom plate of the present invention;

[0033] Figure 8 is a three-dimensional diagram of the brush holder of the present invention (the twisting portion has been twisted);

[0034] Fig. 9 is a cross-sectional view of the through groove in the brush holder riveting structure of the present invention when the brush holder foot is not twisted;

[0035] Fig.10 It is a cross-sectional view of the through groove in the brush holder riveting structure of the present invention after the brush holder foot is twisted.

[0036] In the figure, 1, brush holder, 101, brush holder body, 102, brush holder foot, 1021, fixing part, 1022, yoke, 1023, torsion part, 2, mounting plate, 201, brush holder, 202, bottom plate, 3, through groove, 301, first through hole, 302, second through hole, 4, groove, 5, chamfer, 6, torsion deformation zone, 7, common deformation zone, 8, notch, 9, riveted column, 10, positioning hole. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] Embodiment 1

[0039] like Figure 1-Figure 5 As shown, a brush holder riveted structure includes a brush holder 1 and a mounting plate 2. The brush holder 1 includes a brush holder body 101 and one or more brush holder feet 102 fixed to the brush holder body 101. The brush holder foot 102 has a torsion portion 1023 at one end away from the brush holder body 101.

[0040] The mounting plate 2 has a through slot 3 for the brush holder foot 102 to pass through, and the torsion portion 1023 extends out of the through slot 3 and is twisted so that the mounting plate 2 is pressed between the torsion portion 1023 and the brush holder body 101, and the end face height of the torsion portion 1023 is lower than the end face height of the mounting plate 2, that is, the torsion portion 1023 is hidden inside the mounting plate 2 and will not be connected to the outside through the back side of the mounting plate 2 (the brush holder 1 is installed on the front side of the mounting plate 2), and the through slot 3 is suitable for local circumferential limitation of the brush holder foot 102 so that the torsional deformation of the torsion portion 1023 is kept within the through slot 3.

[0041] The torsional motion of the torsional portion 1023 refers to the rotation of the torsional portion 1023 in a plane parallel to the end surface of the mounting plate 2 (eg Figure 5 , Figure 6 and Figure 8 As shown in the figure, during the twisting process of the twisting portion 1023, the end of the twisting portion 1023 facing the brush holder body 101 is always parallel to the mounting plate 2 until it contacts the mounting plate 2. Since the through groove 3 partially limits the brush holder foot 102 in the circumferential direction, when the twisting portion 1023 is twisted, the part of the brush holder foot 102 that is limited in the circumferential direction cannot rotate together, thereby further preventing the brush holder body 101 from twisting and deforming together, and reducing the deformation of the brush holder 1.

[0042] In this embodiment, two brush holders 1 are fixed on the mounting plate 2 , and four brush holder feet 102 are fixed on each brush holder body 101 .

[0043] A groove 4 is provided at one end of the mounting plate 2 facing away from the brush holder 101, the through groove 3 is located at the groove 4, and the height of the twisting portion 1023 is less than the height of the groove 4. Figure 3 and Figure 5 As shown, each groove 4 corresponds to a brush holder 1, that is, the four brush holder feet 102 of the brush holder 1 are located in the same groove 4, and there are two grooves 4 in total. The groove 4 can be rectangular, circular or other irregular shapes. The groove 4 in the present invention is a rectangular groove.

[0044] The back side of the mounting plate 2 is a smooth plane as a whole, and a groove 4 is provided only at the protruding portion of the brush holder foot 102 to hide the brush holder foot 102, thereby avoiding the possibility of the brush holder 1 being connected to the outside.

[0045] The brush holder 1 adopts a torsion portion 1023 of a rotating brush holder foot 102 so as to form a certain angle with the through slot 3 and to form a stable and reliable connection with the mounting plate 2, thereby avoiding the unstable connection when the conventional brush holder 1 is connected by bending. If the torsion angle of the torsion portion 1023 is too small, a stable connection cannot be achieved, and if the torsion angle is too large, the brush holder foot 102 is easily torsionally broken. Preferably, the torsion angle of the torsion portion 1023 is 15° to 45°. In this embodiment, the cross-section of the brush holder foot 102 is rectangular, and the cross-section of the through slot 3 is the same as that of the brush holder foot 102. Therefore, the angle between the rotated torsion portion 1023 and the long side of the through slot 3 is 15° to 45°.

[0046] In a further design, a chamfer 5 is provided at one end of the twisting portion 1023 away from the brush holder body 101. This guides the brush holder foot 102 when it is inserted into the through slot 3, which facilitates installation.

[0047] The mounting plate 2 can be an integrated structure, with the torsion portion 1023 extending out of the through slot 3. The area on the brush holder foot 102 except the torsion portion 1023 is located in the through slot 3 and is circumferentially fixed to the through slot 3. The through slot 3 limits the circumferential position of the brush holder foot 102 through a non-circular cross-section, thereby limiting the deformation of the brush holder 1. The deformation of the brush holder foot 102 is always controlled within the through slot 3 and cannot extend toward the brush holder body 101.

[0048] Embodiment 2

[0049] The difference between this embodiment and the first embodiment is that the mounting plate 2 is improved from an integrated structure to a split structure, the mounting plate 2 includes a brush holder 201 and a base plate 202 fixed to each other, the base plate 202 is located between the brush holder 201 and the brush holder 1, and the through groove 3 includes a first through hole 301 located on the base plate 202 and a second through hole 302 located on the brush holder 201.

[0050] After the brush holder 201 and the bottom plate 202 are fixedly installed, the first through hole 301 and the second through hole 302 form a through groove 3 that penetrates the brush holder 201 and the bottom plate 202. Figure 3 and Figure 7As shown, the brush holder 201 is provided with a riveted column 9, and the bottom plate 202 is provided with a positioning hole 10 riveted and fixed to the riveted column 9. When installing, the bottom plate 202 is installed through the riveted column 9 on the brush holder 201. When installing the brush holder 1, the brush holder foot 102 is inserted from the first through hole 301 on the bottom plate 202, through the second through hole 302 on the brush holder 201, until the torsion portion 1023 is completely exposed from the end surface of the brush holder 201 (such as Figure 2 As shown), the twisting portion 1023 is rotated until a certain angle is formed between the twisting portion 1023 and the second through hole 302 on the brush holder 201 (as shown in FIG. Figure 5 As shown), the brush holder 1 is fixed on the brush frame 201.

[0051] The brush holder foot 102 further includes a fixing portion 1021 and a yoke 1022. The brush holder body 101, the fixing portion 1021, the yoke 1022 and the torsion portion 1023 are connected in sequence. The cross-sectional size of the yoke 1022 is smaller than the cross-sectional size of the fixing portion 1021 and the torsion portion 1023, so that after the torsion portion 1023 is twisted, the yoke 1022 forms a torsion deformation zone 6. Figure 4 As shown, the cross-sectional shape of the brush holder 102 is a rectangle, and the cross-sectional lengths of the fixed portion 1021, the yoke 1022 and the torsion portion 1023 are equal, and the cross-sectional width of the yoke 1022 is smaller than the cross-sectional widths of the fixed portion 1021 and the torsion portion 1023, so that a symmetrical notch 8 is formed on the brush holder 102. When the brush holder 102 is inserted into the through slot 3, the fixed portion 1021 and the through slot 3 are circumferentially limited, and the yoke 1022 can rotate circumferentially in the through slot 3. When the torsion portion 1023 is rotated, the yoke 1022 located in the through slot 3 has a certain amount of torsional deformation, which plays a good transition role between the fixed portion 1021 and the torsion portion 1023, and avoids torsional fracture of the torsion portion 1023. Preferably, the cross-sectional size of the first through hole 301 is smaller than the cross-sectional size of the second through hole 302, and the fixed portion 1021 cooperates with the first through hole 301 to limit circumferentially (such as Fig. 9 As shown), this can make the fixing portion 1021 fit more tightly with the first through hole 301, thereby preventing the brush gripping foot 102 from shaking in the through groove 3.

[0052] Preferably, before the torsion portion 1023 is twisted, the end surface of one end of the torsion portion 1023 connected to the yoke portion 1022 is located in the through slot 3, and the distance between the end surface and the end surface of the through slot 3 where the torsion portion 1023 is located is h=0.20mm~0.31mm (such as Fig. 9As shown). The brush holder 201 is usually made of plastic, and the brush handle 1 is usually made of metal. In this embodiment, the brush handle 1 is made of copper. When the torsion portion 1023 is rotated, the copper torsion portion 1023 and the plastic brush holder 201 will both be deformed. The deformation of copper is small, while that of plastic is large. During the torsion process, the copper is stretched and its length increases, while the plastic is compressed. This ensures that the torsion portion 1023 is always exposed outside the brush holder 201, and is in close contact with the brush holder 201 and firmly installed after the torsion. If the distance h is small, the deformation of the torsion portion 1023 will cause it to not be in close contact with the brush holder 201, and the installation will not be firm enough. Fig. 9 As shown, the lower end of the pre-twisted torsion portion 1023 is located in the second through hole 302. Fig.10 As shown, after twisting, the yoke 1022 is stretched and deformed upward and outward to form a torsional deformation zone 6. At the same time, the yoke 1022 reaches the end face of the brush holder 201 and squeezes the surface of the brush holder 201, so that the brush holder 201 and the yoke 1022 have a common deformation zone 7, so that the torsion portion 1023 rises to the upper surface of the brush holder 201 and abuts against the surface of the brush holder 201.

[0053] Embodiment 3

[0054] A riveting method, the riveting method adopts the brush holder riveting structure described above, comprising the following steps:

[0055] S1: The brush holder 102 is passed through the through slot 3 from the front of the mounting plate 2 until the brush holder body 101 contacts the surface of the mounting plate 2. At this time, the twisting portion 1023 extends out of the through slot 3, and the rest of the brush holder 102 is located in the through slot 3, and the through slot 3 and the brush holder 102 are circumferentially limited by a non-circular cross section.

[0056] S2: Twist the twisting portion 1023 so that the twisting portion 1023 abuts against the back of the mounting plate 2. The brush holder 1 is fixed to the mounting plate 2 by the twisting portion 1023 located on the back of the mounting plate 2 and the brush holder body 101 located on the front of the mounting plate 2. The twisting force of the twisting portion 1023 only extends into the through groove 3, and does not extend to the brush holder body 101 located on the front of the mounting plate 2.

[0057] In step S1, one end of the torsion portion 1023 is located in the through groove 3; in step S2, after the torsion portion 1023 is twisted, the surface of the mounting plate 2 contacting the torsion portion 1023 has a common deformation zone 7 that deforms together with the brush grip foot 102. As shown in Example 2, the common deformation zone 7 is obtained by the torsional deformation of the yoke 1022 and the deformation of the end face of the mounting plate 2.

[0058] When the mounting plate 2 is fixed by the base plate 202 and the brush holder 201, before step S1, the base plate 202 is first fixed to the brush holder 201, and the base plate 202 is located on the front of the brush holder 201. Then, the brush holding foot 102 is passed through the base plate 202 and the brush holder 201 in sequence, so that the base plate 202 is fixed between the brush holder 201 and the brush holding foot 102. After fixation, the brush holding body 101 abuts against the surface of the base plate 202, the torsion portion 1023 abuts against the surface of the brush holder 201, and the common deformation zone 7 is located on the surface of the brush holder 201.

[0059] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms "length", "width", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0061] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0062] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A brush holder riveting structure, characterized in that: include: A brush holder (1), the brush holder (1) comprising a brush holder body (101) and one or more brush holder feet (102) fixed to the brush holder body (101), wherein one end of the brush holder foot (102) away from the brush holder body (101) has a twisting portion (1023); The mounting plate (2) has a through slot (3) for the brush holder (102) to pass through, the twisting portion (1023) extends out of the through slot (3) and twists so that the mounting plate (2) is pressed between the twisting portion (1023) and the brush holder body (101), and the end face height of the twisting portion (1023) is lower than the end face height of the mounting plate (2), and the through slot (3) is suitable for local circumferential limitation of the brush holder (102) so that the twisting deformation of the twisting portion (1023) is kept within the through slot (3).

2. The brush holder riveting structure according to claim 1, characterized in that: A groove (4) is provided at one end of the mounting plate (2) facing away from the brush holder (101), the through groove (3) is located at the groove (4), and the height of the twisting portion (1023) is smaller than the height of the groove (4).

3. The brush holder riveting structure according to claim 1, characterized in that: The mounting plate (2) comprises a brush holder (201) and a bottom plate (202) fixed to each other, the bottom plate (202) being located between the brush holder (201) and the brush holder (1), and the through groove (3) comprising a first through hole (301) located on the bottom plate (202) and a second through hole (302) located on the brush holder (201).

4. The brush holder riveting structure according to claim 1, characterized in that: The torsion angle of the torsion portion (1023) is 15° to 45°.

5. The brush holder riveting structure according to claim 3, characterized in that: The brush holder foot (102) further comprises a fixing portion (1021) and a yoke portion (1022); the brush holder body (101), the fixing portion (1021), the yoke portion (1022) and the torsion portion (1023) are connected in sequence; the cross-sectional dimensions of the yoke portion (1022) are smaller than the cross-sectional dimensions of the fixing portion (1021) and the torsion portion (1023), so that after the torsion portion (1023) is twisted, the yoke portion (1022) forms a torsion deformation zone (6).

6. The brush holder riveting structure according to claim 5, characterized in that: The cross-sectional dimension of the first through hole (301) is smaller than the cross-sectional dimension of the second through hole (302), and the fixing portion (1021) cooperates with the first through hole (301) to limit circumferentially.

7. The brush holder riveting structure according to claim 5, characterized in that: Before the torsion portion (1023) is twisted, an end face of the torsion portion (1023) connected to the yoke portion (1022) is located in the through groove (3), and the distance h between the end face and the end face of the through groove (3) where the torsion portion (1023) is located is 0.20 mm to 0.31 mm.

8. The brush holder riveting structure according to claim 5, characterized in that: The through groove (3) is a rectangular groove having the same cross section as the brush grip foot (102).

9. The brush holder riveting structure according to claim 7, characterized in that: The brush holder (201) is made of plastic material, and the brush holder (1) is made of metal material.

10. The brush holder riveting structure according to claim 1, characterized in that: An end of the twisting portion (1023) away from the brush holder body (101) is provided with a chamfer (5).

11. A riveting method, characterized in that: The riveting method adopts the brush holder riveting structure according to any one of claims 1 to 10, comprising the following steps: S1: passing the brush holder foot (102) through the through slot (3) from the front side of the mounting plate (2) until the brush holder body (101) contacts the surface of the mounting plate (2); S2: Twisting the twisting portion (1023) so that the twisting portion (1023) abuts against the back surface of the mounting plate (2).

12. The riveting method according to claim 11, characterized in that: In step S1, one end of the twisting portion (1023) is located in the through groove (3); in step S2, after the twisting portion (1023) is twisted, the surface of the mounting plate (2) contacting the twisting portion (1023) has a common deformation zone (7) that deforms together with the brush grip foot (102).

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