A positioning structure of an automobile sealing strip corner joint insert

Abstract

The utility model discloses a kind of automobile sealing strip joint angle insert positioning structure, it is related to automobile parts technical field, including insert body and the positioning hook structure being set on insert body, the positioning hook structure includes four symmetrical distribution's hook unit, each hook unit has outward bending part and connecting part, the connecting part is fixedly connected with insert body.The utility model simple structure, the hook positioning feature on sealing strip joint angle insert and the positioning cutter feature on mould are mutually matched, can play self-positioning, assembly positioning is stable and reliable, through the hook positioning feature structure on insert, it is set in insert bottom.Can reduce the hole left by joint angle injection molding process technology, more effectively prevent rain, dust, noise into car.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically a positioning structure for an automotive sealing strip corner insert. Background Technology

[0002] In automotive sealing systems, inserts embedded inside the corner joints of sealing strips are a common structure. The most common way to integrate them is to place the insert inside the mold before injection molding the corner joint, and then inject filler to fuse them together. Typically, the insert inside the corner joint is made into a thin flat or curved sheet. After being placed in the injection mold, it is fixed by pressing against the upper and lower ejector pins, and then rubber is injected to wrap around it and bond it together with the insert.

[0003] The existing patent (authorization announcement number: CN220008576U) discloses a positioning and waterproofing device for injection molding of automotive parts inserts. The key technical points of the solution are: by setting a positioning device on the surface of the insert body, it is easy for the upper and lower molds to close, and the pre-injection molded parts can be effectively positioned; by setting a waterproof ring outside the positioning device, a small amount of water that has seeped in can be effectively locked inside the ring, thus playing a waterproofing role.

[0004] However, the above technical solutions still have certain defects. Since different inserts are fixed by ejector pins on both the top and bottom sides, ejector pin holes will exist on both the top and bottom sides of the sealing strip corner product after injection molding. The inserts can only be positioned by pressing them together from the top and bottom. During the injection molding process of the rubber filler, they are easily affected by the injection pressure and shift, resulting in actual position deviation. At the same time, when the car is rained on, water will seep into the car through the ejector pin holes on the product, resulting in poor waterproof sealing of the car. Therefore, the existing corner injection molding inserts all have the problem that it is difficult to guarantee the positioning of the inserts inside the corner. To this end, a positioning structure for automotive sealing strip corner inserts is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning structure for the corner insert of an automotive sealing strip, so as to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A positioning structure for an automotive sealing strip corner insert includes an insert body and a positioning hook structure disposed on the insert body. The positioning hook structure includes four symmetrically distributed hook units, each hook unit having an outwardly bent portion and a connecting portion, the connecting portion being fixedly connected to the insert body.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] As a further embodiment of this utility model: the bent portion of the hook unit is L-shaped, and its opening direction is perpendicular to the central axis of the insert body.

[0010] As a further improvement of this utility model, the four hook units are respectively located at the center of the four sides of the insert body.

[0011] As a further embodiment of this utility model: the insert body includes an upper mold and a lower mold, the lower mold is provided with a cutting unit that cooperates with any of the positioning hook structures, the cutting unit is provided with four, and each cutting unit has a slot that matches the bent part of the hook unit.

[0012] As a further improvement of this utility model: the cutting unit is slidably connected to the lower die via a linear guide rail, and the extension direction of the linear guide rail is parallel to the central axis of the insert body.

[0013] As a further improvement of this utility model: the cutting unit is connected to a driving cylinder, and the piston rod of the driving cylinder moves in the same direction as the extension direction of the linear guide rail.

[0014] As a further improvement of this utility model: the top of the insert body is provided with a corner body, which is encapsulated on the outside of the insert body by injection molding.

[0015] As a further improvement of this utility model: a sealing lip is provided at the corner of the corner body, and the extension direction of the sealing lip forms a 45° angle with the central axis of the insert body.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model has a simple structure. The hook positioning feature on the corner insert of the sealing strip cooperates with the positioning cutter feature on the mold to achieve self-positioning and ensure stable and reliable assembly positioning.

[0018] 2. This utility model utilizes a hook positioning feature structure on the bottom of the insert. This reduces holes left over from the injection molding process at the joint, and more effectively prevents rainwater, dust, and noise from entering the vehicle interior.

[0019] 3. The insert hook feature is removed by the mold positioning cutter after injection molding, which can reduce the appearance defects on the surface of the injection molded product and solve the adverse effects of appearance defects on the overall product. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the insert of this utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a side view of the cutting unit of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the corner joint body of this utility model;

[0024] Figure 5 This is a bottom schematic diagram of the corner connector body of this utility model.

[0025] Attached diagram annotations: 1. Insert body; 2. Positioning hook structure; 3. Upper mold; 4. Lower mold; 5. Cutting unit; 6. Linear guide rail; 7. Corner body; 8. Slot;

[0026] 21. Hook unit; 211. Bending part; 212. Connecting part. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] In one embodiment, such as Figures 1-5 As shown, a positioning structure for a corner insert of an automotive sealing strip includes an insert body 1 and a positioning hook structure 2 disposed on the insert body 1. The insert body 1 includes an upper mold 3 and a lower mold 4. The lower mold 4 is provided with a cutting unit 5 that cooperates with any of the positioning hook structures 2. The top of the insert body 1 is provided with a corner body 7, which is covered by injection molding on the outside of the insert body 1.

[0029] In this embodiment, the insert body 1 engages with the mold cutter assembly via four symmetrically distributed hook units 21. Before injection molding, the insert is placed into the mold cavity. At this time, the bent portion 211 of the hook unit 21 precisely engages with the slot 8 of the mold cutter, achieving mechanical positioning in the X / Y / Z directions. During injection molding, rubber material fills the mold cavity and covers the insert body 1. Since the hook unit 21 is completely constrained by the cutter assembly, the insert will not shift due to injection pressure, ensuring the positional accuracy of the insert within the joint. After injection molding, the mold cutter assembly moves along the linear guide 6 to cut off the bent portion 211 of the hook unit 21, leaving no process marks such as ejector pin holes on the outer surface of the joint. At the same time, the insert maintains structural stability through the cured rubber material.

[0030] In one embodiment, as shown in the figure, the positioning hook structure 2 includes four symmetrically distributed hook units 21. Each hook unit 21 has an outwardly bent portion 211 and a connecting portion 212. The connecting portion 212 is fixedly connected to the insert body 1. The bent portion 211 of the hook unit 21 is L-shaped, and its opening direction is perpendicular to the central axis of the insert body 1. The four hook units 21 are respectively located at the middle of the four sides of the insert body 1. The four L-shaped hook units 21 are centrally symmetrically distributed, and the opening direction of their bent portions 211 (horizontal sections) is perpendicular to the central axis of the insert. When the insert is placed in the mold, each L-shaped bent portion 211 will form a three-point contact (bottom surface + two side surfaces) with the U-shaped groove 8 of the mold cutter unit 5. Under the action of injection pressure, the L-shaped bent portion 211 transmits stress to the insert body 1 through its vertical section (connecting portion 212) to avoid local deformation.

[0031] As a supplement: the pinless structure blocks the water vapor penetration path, reduces the leakage rate, and can meet the appearance requirements of the outer surface of the corner without traditional pin holes by cutting off the hook unit 21, thus meeting the requirements of high-end models for the A-level appearance surface.

[0032] In one embodiment, as shown in the figure, the insert body 1 includes an upper mold 3 and a lower mold 4. The lower mold 4 is provided with a cutting unit 5 that cooperates with any of the positioning hook structures 2. There are four cutting units 5, each with a slot 8 that matches the bent portion 211 of the hook unit 21. The cutting unit 5 is slidably connected to the lower mold 4 via a linear guide rail 6. The extension direction of the linear guide rail 6 is parallel to the central axis of the insert body 1. The cutting unit 5 is connected to a drive cylinder, and the piston rod of the drive cylinder moves in the same direction as the extension direction of the linear guide rail 6. The drive cylinder pushes the cutting unit 5 to move along the central axis of the insert, ensuring the engagement gap between the slot 8 and the L-shaped hook. During injection molding, the lateral force borne by the cutting unit 5 is converted into an axial load through the ball slider (such as THK SR type) of the linear guide rail 6 to avoid structural deformation. During the mold closing stage, the cylinder pushes the cutting unit 5 with a driving pressure of 0.5-0.8MPa, and the slot 8 and the bent portion 211 of the hook form an interference fit.

[0033] In one embodiment, as shown in the figure, a sealing lip is provided at the corner of the corner body 7. The extension direction of the sealing lip forms a 45° angle with the central axis of the insert body 1. The 45° angled lip will produce double deformation when under pressure. Compared with the traditional 90° right-angle lip, the 45° design increases the effective sealing width by 30%, greatly reducing the risk of water leakage. It also enhances the adaptability to sheet metal gaps through axial curling deformation, ensuring the sealing effect under different tolerances.

[0034] The above embodiment discloses a positioning structure for an automotive sealing strip corner insert. The insert body 1 cooperates with the mold cutter assembly through four symmetrically distributed hook units 21. Before injection molding, the insert is placed into the mold cavity. At this time, the bent portion 211 of the hook unit 21 precisely engages with the slot 8 of the mold cutter. During the injection molding process, the rubber material fills the mold cavity and covers the insert body 1. The hooks and the mold positioning cutter cooperate with each other. After the injection molding is completed, the mold cutter assembly moves along the linear guide 6 to cut off the bent portion 211 of the hook unit 21, so that there are no pin marks on the outside and the appearance is improved.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A positioning structure for an automotive sealing strip corner insert, comprising an insert body (1) and a positioning hook structure (2) disposed on the insert body, characterized in that: The positioning hook structure (2) includes four symmetrically distributed hook units (21), each hook unit (21) having an outwardly bent portion (211) and a connecting portion (212), the connecting portion (212) being fixedly connected to the insert body (1).

2. The positioning structure for an automotive sealing strip corner insert according to claim 1, characterized in that, The bent portion (211) of the hook unit (21) is L-shaped, and its opening direction is perpendicular to the central axis of the insert body (1).

3. The positioning structure for an automotive sealing strip corner insert according to claim 1, characterized in that, The four hook units (21) are located at the center of the four sides of the insert body (1).

4. The positioning structure for an automotive sealing strip corner insert according to claim 1, characterized in that, The insert body includes an upper mold (3) and a lower mold (4). The lower mold (4) is provided with a cutting unit (5) that cooperates with any of the positioning hook structures (2). There are four cutting units (5), and each cutting unit (5) has a slot (8) that matches the bent part (211) of the hook unit (21).

5. The positioning structure for an automotive sealing strip corner insert according to claim 4, characterized in that, The cutting unit (5) is slidably connected to the lower mold (4) via a linear guide rail (6), and the extension direction of the linear guide rail (6) is parallel to the central axis of the insert body (1).

6. The positioning structure for an automotive sealing strip corner insert according to claim 4, characterized in that, The cutting unit (5) is connected to a drive cylinder, and the piston rod of the drive cylinder moves in the same direction as the extension direction of the linear guide rail (6).

7. The positioning structure for an automotive sealing strip corner insert according to claim 1, characterized in that, The top of the insert body (1) is provided with a corner body (7), which is covered by injection molding on the outside of the insert body (1).

8. The positioning structure for an automotive sealing strip corner insert according to claim 7, characterized in that, The corner of the corner body (7) is provided with a sealing lip, and the extension direction of the sealing lip forms a 45° angle with the central axis of the insert body (1).

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