Electric car seat cushion bottom plate

Abstract

The utility model relates to electric motor car accessory technical field provides an electric motor car cushion bottom plate, its characterized in that: including sheet metal spare and the plastic frame that winds outside the circumference of sheet metal spare, the sheet metal spare includes sheet metal main part and the first flanging that is formed from the edge portion of sheet metal main part and is bent, the edge portion of sheet metal main part and / or first flanging is equipped with several gaps, the inside portion of plastic frame is covered first flanging and gap and is formed with the plastic tenon of inserting gap, the utility model overcomes the deficiency of prior art, has reduced the use amount of plastic piece and has guaranteed structural strength and reliability.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle parts technology, specifically to an electric vehicle seat base plate. Background Technology

[0002] Due to the inherent flammability of plastics, these materials can accelerate the spread of fire and release large amounts of toxic gases during a fire, easily causing catastrophic fire accidents with mass casualties. The new "Safety Technical Specifications for Electric Bicycles" clearly stipulates that the total mass of plastic components used in electric bicycles should not exceed 5.5% of the total vehicle mass. Currently, manufacturers are reducing the total mass of plastic components by adding sheet metal parts or replacing plastic parts with sheet metal parts, based on traditional electric bicycles.

[0003] During the research and development process, the applicant improved the plastic base plate of the electric bicycle seat and proposed an electric bicycle seat base plate. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an electric vehicle seat base plate to solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An electric vehicle seat base plate, characterized in that: it includes a sheet metal part and a plastic frame surrounding the outer periphery of the sheet metal part;

[0007] The sheet metal part includes a sheet metal body and a first flange formed by bending from the edge of the sheet metal body. The edge of the sheet metal body and / or the first flange are provided with several notches.

[0008] The inner part of the plastic frame is covered with a first flange and a notch, forming a plastic tenon with an insertion notch.

[0009] Furthermore, the first flange is formed by bending downwards from the edge of the sheet metal body.

[0010] Furthermore, several of the aforementioned notches are spaced apart and surround the sheet metal part circumferentially.

[0011] Furthermore, the notch includes a guide section extending through the first flange into the sheet metal body and a gathering section formed at the junction of the sheet metal body and the first flange, the gathering section being connected to the guide section and the width of the gathering section being greater than the width of the guide section.

[0012] Preferably, the cross-section of the aggregation section is a rounded rectangle, and the two sides of the opening connecting the aggregation section and the drainage section are respectively provided with chamfers.

[0013] Furthermore, reinforcing ribs are distributed above the portion of the plastic frame that covers the first flange and the notch.

[0014] This utility model provides an electric vehicle seat base plate, which has the following beneficial effects:

[0015] 1. The first bend forms a "hook" structure. During injection molding, the molten plastic will completely wrap around this downward bend. After cooling and solidification, the first bend is "locked" inside the plastic frame, so that the joint can withstand greater pulling force, torque and shear force.

[0016] 2. The bent flange will more smoothly distribute the local concentrated load that may act on the plastic frame (such as the squeezing when installing buckles, the side impact) to a larger area of ​​the sheet metal body, avoiding the stress concentration phenomenon that may occur at the joint of straight edges, and greatly reducing the risk of plastic cracking from the edge when under stress.

[0017] 3. The bent flange increases the positioning stability of the sheet metal part in the mold. At the same time, the existence of the notch is equivalent to creating a series of mechanical stops on the flange. After injection molding, the plastic will fill these notches, forming "plastic tenons" that tightly interlock with the notches on the sheet metal, effectively resisting circumferential shear force and preventing relative movement between the two.

[0018] 4. Compared to a complete, closed flange, the spaced notches can, to some extent, interrupt the internal stress generated by the plastic during cooling and shrinkage, preventing excessive stress concentration in a certain place, thereby reducing the risk of cracking of plastic parts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0021] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle;

[0022] Figure 4 This is a cross-sectional view of the plastic frame covering the first flange and notch in this utility model.

[0023] In the picture:

[0024] 1. Sheet metal parts;

[0025] 11. Sheet metal body;

[0026] 12. First flanging;

[0027] 13. Gap;

[0028] 131. Drainage section;

[0029] 132. Aggregation segment;

[0030] 2. Plastic frame;

[0031] 21. Covering part;

[0032] 22. Covering tank;

[0033] 23. Reinforcing ribs. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] See attached document Figure 1-4 An electric vehicle seat base plate, characterized in that: it includes a sheet metal part 1 and a plastic frame 2 that surrounds the outer periphery of the sheet metal part 1;

[0036] The sheet metal part 1 includes a sheet metal body 11 and a first flange 12 formed by bending downward from the edge of the sheet metal body 11. The edge of the sheet metal body 11 and / or the first flange 12 are provided with a plurality of notches 13.

[0037] The inner part of the plastic frame 2 covers the first flange 12 and the notch 13 and forms a plastic tenon for inserting into the notch 13. That is, the inner part of the plastic frame 2 is the covering part 21, forming a covering groove 22, and the groove contains a plastic tenon (not in the...). Figure 4 As shown, it has a structure that fills the gap 13 and is integrally formed with the two side walls of the covering groove 22.

[0038] In this embodiment, several notches 13 are spaced apart and surround the sheet metal part 1 circumferentially. During the injection molding of the plastic frame 2, the high-temperature molten plastic and the metal (sheet metal part 1) have vastly different coefficients of thermal expansion. When cooling after injection molding, the shrinkage of the plastic is much greater than that of the metal. A continuous circumference of flanges creates a uniform, strong, and unrelieved constraint on the shrinkage. This generates huge circumferential tensile stress inside the plastic, especially at the root corner of the flange (stress concentration point). This stress can easily cause stress cracking of the plastic frame 2 at these weak points during later use. The notches 13 interrupt the continuous flanges, which is equivalent to interrupting the continuous transmission path of shrinkage stress. Each flange segment can shrink independently to a small degree without being firmly bound by a whole circle of metal. The area of ​​the notches 13 provides a "release zone" and "buffer zone" for stress, greatly reducing the overall internal stress level and fundamentally avoiding the risk of cracking due to uneven shrinkage.

[0039] In this embodiment, the plastic frame 2 covers the portion of the first flange 12 and the notch 13, i.e., the covering portion 21, and has reinforcing ribs 23 distributed on top. This can improve the structural strength of the joint between the covering portion 21 and the sheet metal part 1, prevent deformation, and improve the load-bearing capacity of the joint.

[0040] In this embodiment, the notch 13 includes a flow-guiding section 131 extending through the first flange 12 towards the sheet metal body 11 and a gathering section 132 formed at the junction of the sheet metal body 11 and the first flange 12. The gathering section 132 communicates with the flow-guiding section 131, and the width of the gathering section 132 is greater than the width of the flow-guiding section 131. After the sheet metal part 1 is stamped and flanged, the bent root of the first flange 12 connecting to the body is the area with the highest stress concentration, and it is also the place where the plastic part is most prone to cracking when it cools and shrinks. After the plastic solidifies, the larger plastic tenon is formed, which reinforces the weakest area. It changes the force transmission path and disperses the stress to the entire strong plastic tenon. In addition, the molten plastic flows smoothly from the narrow flow-guiding section 131 to the spacious gathering section 132, which can better expel air and avoid air entrapment.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A seat base plate for an electric vehicle, characterized in that: Includes sheet metal parts and a plastic frame surrounding the outer perimeter of the sheet metal parts; The sheet metal part includes a sheet metal body and a first flange formed by bending from the edge of the sheet metal body. The edge of the sheet metal body and / or the first flange are provided with several notches. The inner part of the plastic frame is covered with a first flange and a notch, forming a plastic tenon with an insertion notch.

2. The electric vehicle seat base plate as described in claim 1, characterized in that: The first flange is formed by bending downwards from the edge of the sheet metal body.

3. The electric vehicle seat base plate as described in claim 2, characterized in that: Several of the aforementioned notches are spaced apart and surround the circumference of the sheet metal part.

4. The electric vehicle seat base plate as described in claim 3, characterized in that: The notch includes a guide section extending through the first flange into the sheet metal body and a gathering section formed at the junction of the sheet metal body and the first flange. The gathering section is connected to the guide section and the width of the gathering section is greater than the width of the guide section.

5. The electric vehicle seat base plate as described in claim 4, characterized in that: The cross-section of the aggregation section is a rounded rectangle, and the openings on both sides of the aggregation section and the drainage section are chamfered.

6. The electric vehicle seat base plate as described in claim 1, characterized in that: The plastic frame has reinforcing ribs distributed above the portion covering the first flange and notch.

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