Bushing plastic coating structure

Abstract

The utility model discloses a plastic coating structure of a bushing, which comprises the following components: the bushing which is provided with an inner hole and is provided with an open slot which is through along the axial direction of the bushing and is communicated with the inner hole; the plastic part is subjected to injection molding through an injection molding material; wherein the lining is integrated at the reserved hole position of the plastic part in the injection molding process of the plastic part, and the opening groove can be filled with an injection molding material to form the anti-torsion part. According to the utility model, the binding force between the bushing and the plastic part can be improved, and the bushing can be uniformly stressed, so that the situation that the axis of the bushing is not centered and the end surface is not flat due to deviation of the bushing is avoided; in addition, the open groove is formed in the lining, the injection molding material can be filled into the open groove to form an anti-torsion part, and therefore the binding force between the lining and the plastic part is further improved, the torsion resistance of the lining is improved, in addition, elastic extrusion generated after plastic coating can be absorbed through the open groove, and the service life of the lining is prolonged. And the aperture after the bushing and the plastic part are integrated is ensured to meet the design requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of bushing assembly, in particular to a bushing plastic coating structure. Background Art

[0002] In the prior art, a bushing is often pressed into a reserved hole of a plastic part by pressing it into place, so that the bushing can be used as an installation support. For example, a bushing is installed in a reserved hole in a plastic shell of a controller of a BMS (Battery Management System) of a battery pack, and one end of a screw passes through the bushing and is tightened and fixed at a fixed point of the lower shell of the battery pack, thereby achieving the installation of the controller.

[0003] However, in the prior art, one end opening of the reserved hole is larger than the outer diameter of the bushing, so that the bushing can be pressed into the bushing from the opening, and the other end opening of the reserved hole is smaller than the outer diameter of the bushing, so that the bushing can be squeezed to obtain a certain holding force. Therefore, between the bushing and the inner wall surface of the reserved hole, one part forms an interference fit area, and the other part forms a gap area, causing the bushing to be unevenly stressed and easily displaced, resulting in the bushing's axis being not centered and the end surface being uneven, and the longer the bushing is, the more obvious the displacement is; in addition, due to the unstable holding force of the bushing, the bushing's torsional torque resistance is very low, and when the tightening torque is too large when installing the screw, the bushing is easy to rotate with the screw. Utility Model Content

[0004] The utility model aims to provide a bushing plastic-coated structure to solve the technical problems that the bushing is currently assembled in a reserved hole of a plastic part by pressing, resulting in uneven force on the bushing and easy displacement, as well as low torsional moment resistance of the bushing.

[0005] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] The utility model provides a bushing plastic-coated structure, comprising: a bushing, which has an inner hole, and the bushing is provided with an open groove which penetrates along its axial direction and is connected with the inner hole; a plastic part, which is injection-molded by injection molding material; wherein the bushing is integrated into a reserved hole position of the plastic part during the injection molding process of the plastic part, and the injection molding material can be filled into the open groove to form an anti-twist portion.

[0007] In an implementation manner of the utility model, the width of the opening groove is greater than or equal to 0.5 mm.

[0008] In an implementation manner of the utility model, the width of the open groove is W, and the bushing has a first aperture D1 before being integrated with the plastic part, and the relationship is: W≥0.1D1.

[0009] In an embodiment of the utility model, the bushing has a first aperture D1 before being integrated with the plastic part, and has a second aperture D2 after being integrated with the plastic part, with the relationship: 0.05mm≤(D1-D2)≤0.1mm.

[0010] In an embodiment of the utility model, the bushing is sleeved on the mold insert during the injection molding process of the plastic part, and the outer diameter of the mold insert is equal to the minimum allowable aperture of the bushing before integration with the plastic part.

[0011] In an implementation manner of the utility model, the axial length of the bushing is equal to the axial length of the mold insert.

[0012] In an implementation manner of the utility model, the bushing is formed by stamping and bending a metal plate.

[0013] In an implementation manner of the utility model, the cross-sectional shape of the open groove is fan-shaped.

[0014] In the implementation manner of the utility model, a reinforcement groove is provided on the groove wall surface of the open groove, and the injection molding material can be filled into the reinforcement groove to form a first reinforcement portion.

[0015] In the implementation manner of the utility model, the bushing is provided with a radially penetrating reinforcement hole, and the injection molding material can be filled into the open groove to form a second reinforcement portion.

[0016] The characteristics and advantages of this utility model are:

[0017] The bushing plastic-coating structure of the utility model integrates the bushing into the reserved hole position of the plastic part during the injection molding process of the plastic part, so that the injection molding material can cover the bushing, thereby improving the bonding force between the bushing and the plastic part, and can make the bushing bear the force evenly, thereby avoiding the bushing being offset and causing the axis of the bushing to be not centered and the end surface to be uneven; in addition, an open groove is provided on the bushing, so that the injection molding material can be filled into the open groove to form an anti-twist portion, thereby further improving the bonding force between the bushing and the plastic part, and improving the torsion resistance of the bushing. In addition, the open groove can absorb the elastic extrusion after plastic coating, thereby ensuring that the aperture after the bushing and the plastic part are integrated meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1It is a three-dimensional schematic diagram of the bushing in the utility model.

[0020] Figure 2 It is a schematic diagram of the plastic-coated structure of the bushing in the utility model.

[0021] Figure 3 It is a schematic diagram of the assembly of the bushing and the injection molding mold in the utility model.

[0022] Figure 4 It is a cross-sectional schematic diagram of the bushing in the utility model.

[0023] In the figure:

[0024] 1. Bushing; 11. Inner hole; 12. Opening groove;

[0025] 2. Plastic parts; 21. Anti-twist part;

[0026] 3. Injection molding mold; 31. Mold stator; 32. Mold insert. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 and Figure 2 As shown, the utility model provides a bushing plastic-coated structure, comprising: a bushing 1, having an inner hole 11, and the bushing 1 is provided with an open groove 12 which penetrates along its axial direction and is connected to the inner hole 11; a plastic part 2, which is injection molded by injection molding material; wherein, the bushing 1 is integrated into the reserved hole position of the plastic part 2 during the injection molding process of the plastic part 2, and the injection molding material can be filled into the open groove 12 to form an anti-twist portion 21.

[0029] The bushing overmolding structure of the utility model integrates the bushing 1 into the reserved hole position of the plastic part 2 during the injection molding process of the plastic part 2, so that the injection molding material can cover the bushing 1, thereby improving the bonding force between the bushing 1 and the plastic part 2, and can make the bushing 1 evenly stressed, thereby avoiding the bushing 1 from being offset and causing the axis of the bushing 1 to be not centered and the end surface to be uneven; in addition, by arranging an open groove 12 on the bushing 1, the injection molding material can be filled into the open groove 12 to form an anti-twist portion 21, thereby further improving the bonding force between the bushing 1 and the plastic part 2, and improving the torsion resistance of the bushing 1. In addition, the open groove 12 can absorb the elastic extrusion after overmolding, ensuring that the aperture after the bushing 1 and the plastic part 2 are integrated meets the design requirements.

[0030] Specifically, the plastic part 2 includes but is not limited to the plastic shell of the battery pack controller of this embodiment. Figures 1 to 3 As shown, by positioning the bushing 1 in the injection molding mold 3 of the plastic part 2, and then injecting the injection molding material into the injection molding mold 3, the injection molding material covers the bushing 1 and fills the opening groove 12, and the injection molding material solidifies to form the plastic part 2 and combines with the bushing 1. Among them, the injection molding mold 3 includes a mold stator 31 and a mold insert 32, the mold stator 31 has a molding cavity of the plastic part 2, and the mold insert 32 is located at the reserved hole position. By sleeve-mounting the bushing 1 on the mold insert 32, the positioning of the bushing 1 is ensured, and after the plastic part 2 is formed and the mold insert 32 is demolded, the inner hole 11 of the bushing 1 is exactly located at the reserved hole position, ensuring that the position of the inner hole 11 of the bushing 1 meets the requirements. In addition, the axial length of the bushing 1 is equal to the axial length of the mold insert 32.

[0031] like Figure 4 As shown, in the embodiment of the utility model, the width of the opening groove 12 is greater than or equal to 0.5 mm to ensure that the opening groove 12 can absorb the elastic extrusion after the plastic coating. Specifically, the cross-sectional shape of the opening groove 12 is a fan-shaped. The width of the opening groove 12 is the spacing width of the groove wall surfaces on both sides thereof close to the axis of the inner hole 11.

[0032] like Figure 4 As shown, in order to ensure that the anti-twist portion 21 formed by the injection material filling the open groove 12 has good torsion resistance, in the embodiment of the utility model, the width of the open groove 12 is W, and the bushing 1 has a first aperture D1 before being integrated with the plastic part 2, and has the relationship: W≥0.1D1.

[0033] like Figure 1 and Figure 2 As shown, since the bushing 1 will shrink due to the elastic extrusion of the injection molding material after the overmolding, the bushing 1 has a second aperture D2 after being integrated with the plastic part 2. In order to make the second aperture D2 meet the design requirements, in the implementation of the utility model, the first aperture D1 and the second aperture D2 have a relationship of: 0.05mm≤(D1-D2)≤0.1mm. For example, in this embodiment, the aperture design requirement of the bushing 1 is 8.5mm±0.1mm, so the first aperture D1 needs to be enlarged to be greater than or equal to 8.55mm and less than or equal to 8.6mm, so that the second aperture D2 of the inner hole 11 of the bushing 1 after shrinking by 0.05mm~0.1mm due to the elastic extrusion of the injection molding material is 8.5mm±0.1mm.

[0034] Further, combined with Figure 3As shown, in order to make the bushing 1 fit on the mold insert 32 and ensure that the second aperture D2 of the bushing 1 after overmolding meets the design requirements, the outer diameter D3 of the mold insert 32 is equal to the minimum allowable aperture of the bushing 1 before integration with the plastic part 2, that is, the minimum value of the first aperture D1. For example, in this embodiment, the minimum allowable aperture of the bushing 1 before integration with the plastic part 2 is 8.55 mm, so the outer diameter D3 of the mold insert 32 is equal to 8.55 mm.

[0035] like Figure 2 As shown, in some embodiments of the present invention, the bushing 1 is formed by stamping and bending a metal plate, which is easy to process and convenient for controlling the first aperture D1 of the bushing 1 and the width of the opening slot 12. Specifically, the metal plate is generally a rectangular metal sheet structure.

[0036] In other embodiments of the present invention, the bushing 1 is manufactured by cutting an opening on a metal pipe.

[0037] like Figure 2 As shown, in some embodiments of the present invention, the bushing 1 is only provided with an open groove 12 without other grooves on the wall, which is easy to process and the torsion resistance of the bushing 1 meets the requirements.

[0038] In some other embodiments of the utility model, the groove wall surface of the open groove 12 is provided with a reinforcement groove, and the injection molding material can be filled into the reinforcement groove to form a first reinforcement part. By providing the reinforcement groove to form the first reinforcement part, the bonding strength between the bushing 1 and the plastic part 2 can be further enhanced, thereby further improving the torsion resistance of the bushing 1. Specifically, the number of grooves can be one, which is provided on one side of the groove wall surface of the open groove 12; the number of grooves can also be multiple, and multiple grooves are provided on the groove wall surfaces on both sides of the open groove 12 and / or are arranged and arranged on the groove wall surface of the open groove 12 at intervals along the axial direction of the bushing 1.

[0039] In some other embodiments of the utility model, the bushing 1 is provided with a radially penetrating reinforcement hole, and the injection molding material can be filled into the opening groove 12 to form a second reinforcement portion. By providing the reinforcement hole to form the second reinforcement portion, the bonding strength between the bushing 1 and the plastic part 2 can be further enhanced, thereby further improving the torsion resistance of the bushing 1.

[0040] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A bushing plastic-coated structure, characterized in that: include: The bushing has an inner hole, and the bushing is provided with an open groove penetrating along the axial direction thereof and communicating with the inner hole; Plastic parts, which are injection molded by injection molding materials; Wherein, the bushing is integrated into the reserved hole of the plastic part during the injection molding process of the plastic part, and the injection material can be filled into the open groove to form an anti-twist portion.

2. The bushing plastic-coated structure according to claim 1, characterized in that: The width of the opening groove is greater than or equal to 0.5 mm.

3. The bushing plastic-coated structure according to claim 2, characterized in that: The width of the opening groove is W, and the bushing has a first aperture D1 before being integrated with the plastic part, and the relationship is: W≥0.1D1.

4. The bushing plastic-coated structure according to claim 1, characterized in that: The bushing has a first aperture D1 before being integrated with the plastic part, and has a second aperture D2 after being integrated with the plastic part, with the relationship: 0.05 mm ≤ (D1 - D2) ≤ 0.1 mm.

5. The bushing plastic-coated structure according to claim 4, characterized in that: The bushing is sleeved on the mold insert during the injection molding process of the plastic part, and the outer diameter of the mold insert is equal to the minimum allowable aperture of the bushing before integration with the plastic part.

6. The bushing plastic-coated structure according to claim 5, characterized in that: The axial length of the bushing is equal to the axial length of the mold insert.

7. The bushing plastic-coated structure according to claim 1, characterized in that: The bushing is formed by stamping and bending a metal sheet.

8. The bushing plastic-coated structure according to claim 1, characterized in that: The cross-sectional shape of the opening groove is fan-shaped.

9. The bushing plastic-coated structure according to claim 1, characterized in that: A reinforcement groove is provided on the groove wall surface of the opening groove, and the injection molding material can be filled into the reinforcement groove to form a first reinforcement portion.

10. The bushing plastic-coated structure according to claim 1, characterized in that: The bushing is provided with a radially penetrating reinforcement hole, and the injection molding material can be filled into the opening groove to form a second reinforcement part.

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