Integrated buckle structure of automobile plastic part and automobile plastic part

Abstract

This invention discloses an integrated snap-fit ​​structure for automotive plastic parts and the automotive plastic part itself. The snap-fit ​​body is integrally formed with the automotive plastic part. The snap-fit ​​body includes a connecting portion connected to the automotive plastic part at one end and a snap-fit ​​portion connected to the other end of the connecting portion. The snap-fit ​​portion is provided with an insertion guide surface facing the insertion direction and an extraction guide surface facing the extraction direction. The insertion angle of the insertion guide surface is set to 35°–40°, and the extraction angle of the extraction guide surface is set to 20°–25°. The insertion angle is the angle between the insertion guide surface and the insertion direction, and the extraction angle is the angle between the extraction guide surface and the horizontal plane of the sheet metal part. The snap-fit ​​structure is optimized so that the maximum von Mises stress during assembly and repeated insertion and extraction is less than 90% of the material's yield strength. The plastic part and the snap-fit ​​will not turn white or break, and the insertion and extraction forces of the snap-fit ​​meet the design standards.

Description

Technical Field

[0001] This invention belongs to the field of automotive interior and exterior trim technology, specifically relating to an integrated snap-fit ​​structure for automotive plastic parts and automotive plastic parts. Background Technology

[0002] Unlike individual plastic clips, which can be easily replaced if they turn white or break during assembly, integrated plastic clips require replacement of the entire plastic part if they turn white or break during assembly. Furthermore, integrated plastic clips must be designed to prevent whitening or breakage after multiple disassemblies and reassemblies.

[0003] While one-piece plastic clips carry the risk of requiring the replacement of the entire product during assembly, they offer advantages such as easy installation, low cost, and flexible use. Therefore, the structure of one-piece plastic clips needs to be optimized to ensure that whitening or breakage does not occur during assembly, and to avoid the risk of the product becoming difficult to assemble due to excessive insertion force or loosening or even falling off during operation due to insufficient pull-out force. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated snap-fit ​​structure for automotive plastic parts and automotive plastic parts, so as to solve the problem of snap-fit ​​turning white or breaking after assembly and repeated disassembly of integrated plastic parts.

[0005] This invention is achieved through the following technical solution: An integrated snap-fit ​​structure for automotive plastic parts includes a snap-fit ​​body integrally formed with the automotive plastic part, used to snap and fix the automotive plastic part to the sheet metal part when the snap-fit ​​body is inserted into the mounting hole of the sheet metal part. The buckle body includes a connecting part that is connected to the automotive plastic part at one end and a snap-fit ​​part that is connected to the other end of the connecting part. The snap-fit ​​part is provided with an insertion guide surface facing the insertion direction and an extraction guide surface facing the extraction direction. The insertion angle of the insertion guide surface is set to 35° to 40°, and the extraction angle of the extraction guide surface is set to 20° to 25°. The insertion angle is the angle between the insertion guide surface and the insertion direction, and the extraction angle is the angle between the extraction guide surface and the horizontal plane where the sheet metal part is located.

[0006] In some embodiments, the overlap of the snap-fit ​​portion is 1.0 mm to 1.2 mm, and the overlap is the distance from the snap-fit ​​position of the snap-fit ​​portion to the outer side of the snap-fit ​​portion along the snap-fit ​​deformation direction of the snap-fit ​​body.

[0007] In some embodiments, the length of the snap-fit ​​portion along the insertion direction is 6.0 mm to 7.0 mm, and the dimension of the snap-fit ​​portion along the snap-fit ​​deformation direction of the buckle body is 3.5 mm to 4.5 mm.

[0008] In some embodiments, the two sides of the connecting portion are respectively provided with root rounded corners at the connection position with the automotive plastic parts, and the radius of the root rounded corners is 2.0mm to 2.5mm.

[0009] In some embodiments, the thickness of the connecting portion is 1.7mm to 2.0mm, and the width is 4.5mm to 5.5mm.

[0010] In some embodiments, the length of the buckle body along the insertion direction is 12mm to 13.5mm.

[0011] In some embodiments, the snap-fit ​​portion includes a reinforcing rib disposed toward the insertion direction, and the insertion guide surface is located on the reinforcing rib.

[0012] In some embodiments, the thickness of the reinforcing rib is 1.8 mm to 2.2 mm.

[0013] In some embodiments, the buckle body is made of PP-TD20 material.

[0014] On the other hand, the present invention also provides an automotive plastic part, including a plastic part body and an integrated snap-fit ​​structure for the automotive plastic part disposed circumferentially along the plastic part body; The plastic part body is provided with a limiting end face that cooperates with the sheet metal part. The limiting end face is arranged opposite to the pull-out guide surface of the snap-fit ​​part. The plastic part of the car is snapped and fixed on the sheet metal part by the cooperation between the pull-out guide surface, the limiting end face and the two sides of the sheet metal part.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention optimizes the design of the buckle structure so that the maximum von Mises stress of the buckle during assembly and repeated insertion and removal is less than 90% of the material's yield strength. The plastic parts and buckles will not turn white or break, and the insertion force and extraction force of the buckles can meet the design standard requirements. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the snap-fit ​​structure of an integrated automotive plastic part in the snap-fit ​​state according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the cross section in the middle II direction.

[0019] Figure 3 This is a schematic diagram of the insertion angle and withdrawal angle of the snap-fit ​​part in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of an automotive plastic part according to an embodiment of the present invention.

[0021] in: 10. Automotive plastic parts; 11. Buckle body; 111. Connecting part; 112. Snap-fit ​​part; 113. Insertion guide surface; 114. Pull-out guide surface; 115. Reinforcing rib. 11a. Insertion angle; 11b. Pull-out angle; 11c. Overlap amount; 11d. Length of the snap-fit ​​part along the insertion direction; 11e. Dimension of the snap-fit ​​part along the snap-fit ​​deformation direction of the snap-fit ​​body; 11f. Root rounded corner; 11g. Length of the snap-fit ​​body along the insertion direction; 11h. Width of the connecting part. 12. Cover plate; 121. Limiting end face; 122. Relief groove; 13. Skirt; 131. Notch; 20. Sheet metal parts. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments of the present invention, the integrated snap-fit ​​structure for automotive plastic parts includes a snap-fit ​​body 11 integrally formed with the automotive plastic part 10, which is used to snap and fix the automotive plastic part 10 onto the sheet metal part 20 when the snap-fit ​​body is inserted into the mounting hole of the sheet metal part 20.

[0024] The buckle body 11 includes a connecting part 111 connected to a plastic part of an automobile at one end and a snap-fit ​​part 112 connected to the other end of the connecting part; The latching part 111 is provided with an insertion guide surface 113 facing the insertion direction and an extraction guide surface 114 facing the extraction direction. The insertion guide surface 113 and the extraction guide surface 114 are inclined surfaces, which are used to provide guidance for the latch body during insertion and extraction, so as to facilitate the insertion and extraction of the latch body. In order to achieve the performance of repeated insertion and extraction of the latch body, the angle of the insertion guide surface and the extraction guide surface of the latch body is optimized.

[0025] Specifically, when the insertion angle 11a of the insertion guide surface 113 is set to 35°–40° and the withdrawal angle 11b of the withdrawal guide surface 114 is set to 20°–25°, good repeated insertion and withdrawal performance can be achieved; for example Figure 3 As shown, the insertion angle 11a is the angle between the insertion guide surface and the insertion direction, and the withdrawal angle 11b is the angle between the withdrawal guide surface and the horizontal plane where the sheet metal part is located.

[0026] In some embodiments, the overlap 11c of the snap-fit ​​portion 112 is 1.0 mm to 1.2 mm, such as... Figure 2 As shown, the overlap amount 11c is the distance from the snapping position of the snapping part to the outer side of the snapping part along the snapping deformation direction of the snapping body. The size of the overlap amount and the matching setting of the insertion angle and the pull-out angle can not only facilitate the insertion of the snapping body, but also ensure the stability of the snapping and prevent the snapping body from coming off when the car is bumpy.

[0027] In some embodiments, the length 11d of the snap-fit ​​portion 112 along the insertion direction is 6.0 mm to 7.0 mm, and the dimension 11e of the snap-fit ​​portion 112 along the snap-fit ​​deformation direction of the buckle body is 3.5 mm to 4.5 mm.

[0028] In some embodiments, the snap-fit ​​body 11 is disposed in the plane of the automotive plastic part body, and one end of the snap-fit ​​body 11 is connected to the automotive plastic part body, forming a cantilever structure. When the snap-fit ​​body is inserted, under the squeezing action between the insertion guide surface and the sheet metal part, deformation occurs at the connection position of the connection part, causing the snap-fit ​​body to move into the automotive plastic part body. Root rounded corners are respectively provided at the connection positions between the two sides of the connection part and the automotive plastic part. The radius of the root rounded corner 11f is set to 2.0mm to 2.5mm, which can better reduce stress concentration at the root and further improve the repeated insertion and removal performance of the snap-fit ​​structure.

[0029] In some embodiments, the thickness of the connecting portion 111 is set to 1.7mm to 2.0mm, and the width of the connecting portion 11h is 4.5mm to 5.5mm.

[0030] In some embodiments, the length 11g of the buckle body 11 along the insertion direction is 12mm to 13.5mm.

[0031] In some embodiments, the snap-fit ​​portion 112 includes a reinforcing rib 115 disposed toward the insertion direction side to increase the structural strength at that location, and the insertion guide surface is disposed on the reinforcing rib.

[0032] In some embodiments, the thickness of the reinforcing rib 115 is set to 1.8 mm to 2.2 mm.

[0033] In some embodiments, the buckle body 11 is made of PP-TD20 material, which is a material obtained by filling polypropylene with 20% talc.

[0034] By coordinating the overlap between the buckle body and the sheet metal part, the rounded corners at the root, and the thickness and width of the connecting part, it can be well ensured that the buckle body will not turn white or break during insertion or removal. That is, the maximum von Mises stress of the one-piece plastic buckle 2 during assembly is less than 90% of the material yield strength (the yield strength of PP-TD20 material is 22MPa, and 90% of it is 19.8MPa). The design of the fit between the dimensions of the snap-fit ​​part along the snap-fit ​​deformation direction of the snap-fit ​​body, the insertion angle, and the length of the snap-fit ​​body along the insertion direction ensures that the insertion force meets the design standard requirements (the insertion force of a single snap-fit ​​is 5 to 10 N). The design of the pull-out angle, the length of the snap-fit ​​part along the insertion direction, the reinforcing ribs and their dimensions ensures that the pull-out force meets the design standard requirements (the pull-out force of a single snap is 45-60N).

[0035] On the other hand, the present invention also provides an automotive plastic part, including a plastic part body and an integrated snap-fit ​​structure for the automotive plastic part disposed circumferentially along the plastic part body; The plastic part body is provided with a limiting end face 121 that cooperates with the sheet metal part. The limiting end face 121 is arranged opposite to the pull-out guide surface of the snap-fit ​​part 112. The plastic part of the car is snapped and fixed on the sheet metal part by the cooperation between the pull-out guide surface, the limiting end face and the two sides of the sheet metal part.

[0036] Reference Figure 4 The automotive plastic body 10 includes a cover plate 12 and a skirt 13 disposed on one side of the cover plate. The buckle bodies 11 are respectively disposed on the skirt 13 along the circumference of the skirt. The cover plate 12 forms a limiting end face 121 on the outer side of the skirt to cooperate with the sheet metal part. The skirt 13 is provided with a plurality of notches 131 at one end near the cover plate. The buckle bodies 11 are disposed in the notches 131 and connected to the skirt 13 to form a cantilever structure. At this time, the snap-fit ​​part is set towards the cover plate and the insertion guide surface is set towards the connecting part.

[0037] A clearance groove 122 is provided on the limiting end face 121 of the cover plate 12 at a position corresponding to the buckle body 11. The clearance groove 122 can provide a certain clearance space for the sheet metal part at the snap-fit ​​position, so that the sheet metal part can deform to a certain extent in the direction of the clearance space during the insertion and removal of the buckle body, so as to facilitate the insertion and removal of the buckle body; and the clearance groove can facilitate the removal operation of automotive plastic parts.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A one-piece snap-fit ​​structure for automotive plastic parts, characterized in that, Includes a snap-fit ​​body integrally molded with the automotive plastic part, used to snap and fix the automotive plastic part to the sheet metal part when the snap-fit ​​body is inserted into the mounting hole of the sheet metal part; The buckle body includes a connecting part that is connected to the automotive plastic part at one end and a snap-fit ​​part that is connected to the other end of the connecting part. The snap-fit ​​part is provided with an insertion guide surface facing the insertion direction and an extraction guide surface facing the extraction direction. The insertion angle of the insertion guide surface is set to 35° to 40°, and the extraction angle of the extraction guide surface is set to 20° to 25°. The insertion angle is the angle between the insertion guide surface and the insertion direction, and the extraction angle is the angle between the extraction guide surface and the horizontal plane where the sheet metal part is located.

2. The integrated snap-fit ​​structure for automotive plastic parts according to claim 1, characterized in that, The overlap of the snap-fit ​​part is 1.0mm to 1.2mm, and the overlap is the distance from the snap-fit ​​position of the snap-fit ​​part to the outer side of the snap-fit ​​part along the snap-fit ​​deformation direction of the snap-fit ​​body.

3. The integrated snap-fit ​​structure for automotive plastic parts according to claim 2, characterized in that, The length of the snap-fit ​​part along the insertion direction is 6.0mm to 7.0mm, and the dimension of the snap-fit ​​part along the snap-fit ​​deformation direction of the buckle body is 3.5mm to 4.5mm.

4. The integrated snap-fit ​​structure for automotive plastic parts according to claim 3, characterized in that, The connecting part has rounded corners at the connection points on both sides with the automotive plastic parts, and the radius of the rounded corners is 2.0mm to 2.5mm.

5. The integrated snap-fit ​​structure for automotive plastic parts according to claim 4, characterized in that, The thickness of the connecting part is 1.7mm to 2.0mm, and the width is 4.5mm to 5.5mm.

6. The integrated snap-fit ​​structure for automotive plastic parts according to claim 5, characterized in that, The length of the buckle body along the insertion direction is 12mm to 13.5mm.

7. The integrated snap-fit ​​structure for automotive plastic parts according to claim 1, characterized in that, The snap-fit ​​portion includes a reinforcing rib disposed on the side facing the insertion direction, and the insertion guide surface is located on the reinforcing rib.

8. The integrated snap-fit ​​structure for automotive plastic parts according to claim 7, characterized in that, The thickness of the reinforcing rib is 1.8mm to 2.2mm.

9. The integrated snap-fit ​​structure for automotive plastic parts according to claim 1, characterized in that, The buckle body is made of PP-TD20 material.

10. An automotive plastic part, characterized in that, The invention includes a plastic part body and a plurality of integrated snap-fit ​​structures for automotive plastic parts as described in any one of claims 1-9 arranged circumferentially along the plastic part body. The plastic part body is provided with a limiting end face that cooperates with the sheet metal part. The limiting end face is arranged opposite to the pull-out guide surface of the snap-fit ​​part. The plastic part of the car is snapped and fixed on the sheet metal part by the cooperation between the pull-out guide surface, the limiting end face and the two sides of the sheet metal part.

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