Combined instrument circuit board fixing structure

Abstract

The utility model discloses a combination instrument circuit board fixing structure, which comprises at least three groups of buckles arranged on a shell, elastic top blocks are arranged on the inner sides, opposite to the buckles, of the shell, and circuit board components are clamped between the buckles and the elastic top blocks. The fixing structure has the following advantages and effects: by adopting the fixing structure, the original mode of fixing the circuit board by tapping screws is completely abandoned when the combination instrument is assembled, and the fixing structure has the advantages of reducing the cost, improving the efficiency and being high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive instrument technology, and in particular to a fixing structure for a combination instrument circuit board. Background Technology

[0002] Currently, the circuit board components of automotive instrument clusters are primarily secured using self-tapping screws. There are two main methods: one involves designing screw holes on the circuit board, clamping the circuit board between two plastic components, and then tightening the plastic components with self-tapping screws to secure all three together (see attached image). Figure 2 Another method involves designing screw holes on the circuit board and screw posts on the plastic housing. Self-tapping screws pass through the through-holes in the circuit board and are tightened onto the screw posts in the plastic housing, thus securing the two together (see attached diagram). Figure 1 Both structures require an additional screw-driving station in the production process, which not only increases the cost of parts but also labor costs, resulting in low production efficiency and hindering the achievement of automated assembly requirements. Furthermore, the screws are subject to vibration during vehicle operation, making them prone to loosening or falling off, thus reducing reliability.

[0003] Furthermore, due to the different coefficients of thermal expansion and contraction between the circuit board and the plastic casing, when the circuit board is large, the screw fastening structure may cause the plastic parts to bulge due to the difference in coefficients, leading to product failure.

[0004] To solve this problem, after dedicated research by the designers, a completely new fixing structure was finally developed. Utility Model Content

[0005] The purpose of this utility model is to provide a fixing structure for a combination instrument circuit board.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a combination instrument circuit board fixing structure, including at least three sets of buckles disposed on the housing, and elastic top blocks disposed on the housing relative to the inner side of the buckles, and the circuit board component is snapped between the buckles and the elastic top blocks.

[0007] A further feature is provided on the housing with a transverse U-shaped slot at the front end of the buckle.

[0008] A further feature is provided: a groove is provided in the middle of the end of the elastic top block.

[0009] The buckle and the elastic top block are further configured to taper from the root to the end.

[0010] In summary, this utility model has the following beneficial effects: Using the mechanism of this application, the assembly of the instrument completely eliminates the original method of fixing the circuit board with self-tapping screws, and instead uses a plastic clip and elastic top block structure to fix the circuit board. The advantages are:

[0011] Cost reduction: Since this solution still uses conventional plastic materials, it does not increase the cost of the plastic casing unit. The solution eliminates the cost of screw materials, and by eliminating the screw-making process, labor costs are reduced.

[0012] Efficiency Improvement: The flexible structure ensures that the assembly and maintenance of the instrument combination are very convenient. Assembly can be completed simply by workers pressing the instrument, which greatly improves production efficiency.

[0013] High reliability: The position and quantity of the fixing structure can be reasonably arranged according to the size and weight of the circuit board (component) to ensure that the product can fully withstand the strong vibration of the vehicle or extreme conditions such as high and low temperatures, resulting in high reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first type of conventional fixing structure;

[0015] Figure 2 This is a schematic diagram of the second type of conventional fixing structure;

[0016] Figure 3 This is a top view of the fixed structure of this application;

[0017] Figure 4 for Figure 3 A schematic diagram of the B-direction;

[0018] Figure 5 for Figure 3 Schematic diagram of section AA;

[0019] Figure 6 This is an isometric view of the fixed structure of this application.

[0020] In the diagram: 1. Housing; 2. Buckle; 3. Elastic top block; 4. U-shaped slot; 5. Groove; 6. Circuit board; 7. Plastic frame; 8. Plastic outer shell; 9. Self-tapping screw. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] A circuit board fixing structure for a combination instrument, wherein the fixing structure comprises at least three sets, preferably four sets.

[0023] Each set of fixing structures includes a latch and a resilient top block mounted on the housing. The latches are all located on the outer side and include an inwardly extending triangular block with its upper end horizontally positioned. A resilient top block is located on the inner side of the housing opposite the latch, and the circuit board component is secured between the latch and the resilient top block.

[0024] A transverse U-shaped slot is provided on the housing at the front end of the latch. The two sides of this U-shaped slot are located on both sides of the elastic top block, so that the elastic top block has an overall L-shaped structure, which can realize the elastic effect of the elastic top block. At the same time, this design of the circuit board (component) can ensure that the assembly is convenient even when there is a zero clearance fit or an interference fit.

[0025] A groove is provided in the middle of the end of the elastic top block. When each top block is supported, the mating surface with the circuit board adopts a two-point mating structure. The long strip-shaped contact surface at the front end of the elastic top block is hollowed out in the middle. This design makes it easy to ensure the flatness (consistent height) of the mating surface.

[0026] Both the latch and the elastic top block are designed to taper from the root towards the end.

[0027] The fixed plastic parts and the circuit board (components) in this application are not tightened together. When heated, the parts can move laterally, so they will not bulge due to the difference in thermal expansion and contraction coefficients between the plastic and the circuit board materials. In addition, the elastic structure also has the function of absorbing vibration energy.

[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A circuit board fixing structure for a combination instrument, characterized in that: The device includes at least three sets of latches on the housing, and elastic top blocks are provided on the housing relative to the inner side of the latches. The circuit board component is snapped between the latches and the elastic top blocks. A transverse U-shaped slot is provided on the housing at the front end of the latches. A groove is provided in the middle of the end of the elastic top block. Both the latches and the elastic top blocks are tapered from the root to the end.

Images