Vehicle-mounted integrated lens cone assembly

Abstract

The utility model discloses a vehicle-mounted integrated lens cone assembly. The end part of the lens barrel is provided with a riveting hole, and a copper column is installed in the hole. One end of the copper column is provided with a blind hole in which a steel ball is embedded. The diameter of the steel ball is larger than that of the blind hole, the steel ball is squeezed into the blind hole during press fitting, radial plastic bulging is generated on the outer wall of the blind hole portion of the copper column, the outer wall of the copper column after bulging is in mechanical interference fit with the wall of the through hole, and therefore high-strength locking of the copper column is achieved. The diameter of the steel ball is matched with the outer diameter of the copper column and the size of the blind hole according to a preset proportion, one-time press fitting can be completed under the conditions of no adhesive and no heat input, and the exposure height of the copper column can be measured online in the assembling process to judge that the copper column is qualified. The assembling consistency and the vibration-resistant reliability of the lens cone assembly are obviously improved; meanwhile, the process is simple, the takt is short, and the method is suitable for large-scale vehicle-mounted optical

Description

Technical Field

[0001] This utility model relates to the field of automotive electronic assembly technology, and in particular to an integrated vehicle-mounted mirror tube assembly. Background Technology

[0002] With the widespread adoption of Advanced Driver Assistance Systems (ADAS) and in-vehicle night vision and surround view functions, the automotive industry is increasingly using compact, integrated automotive camera barrels (also known as in-vehicle camera barrels). These barrels are typically precision-machined from a single piece of aluminum alloy, featuring thin walls, lightweight construction, and high dimensional stability. Their inner and outer surfaces directly support the positioning references for components such as lenses, filters, and circuit boards. To achieve electrical conductivity, positioning, or anti-rotation locking functions during subsequent assembly, several small copper pillars (typically ≤1.5mm in outer diameter and only a few millimeters in length) are often riveted to the barrel wall. The strength of the connection between the copper pillars and the barrel directly affects the reliability of the camera module under complex automotive vibration and thermal shock conditions.

[0003] Currently, the industry mainly uses mechanical pressing to form a micro-interference fit for fixing such tiny copper pillars. Then, epoxy or anaerobic adhesive is applied before and after pressing to enhance the pull-out force. However, this method has significant drawbacks. The copper pillar diameter is extremely small, and the surface tension of the adhesive causes large fluctuations in the actual coating amount. This can easily lead to localized areas without adhesive or excessively thick adhesive layers that crack the thin walls. The strength of the adhesive joint can only be checked through destructive pull-out tests, with a pass rate of only 90%. Furthermore, the pull-out force after riveting cannot be fully inspected, posing a potential risk of failure in the context of the automotive industry's pursuit of zero defects. Utility Model Content

[0004] The purpose of this utility model is to provide an integrated vehicle-mounted mirror tube assembly, which has the advantages of simple and reliable structure and high riveting strength.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A vehicle-mounted integrated mirror tube assembly, comprising:

[0007] The end of the lens barrel is provided with a riveting hole;

[0008] A copper post is inserted into the rivet hole, and a blind hole is provided at the end of the copper post facing the bottom of the rivet hole;

[0009] A fixing bead is disposed in the rivet hole and embedded in the blind hole;

[0010] The diameter of the fixing bead is larger than the diameter of the blind hole, so that after the fixing bead is embedded in the blind hole, it causes the outer wall of the copper column to undergo radial plastic expansion at the blind hole. The outer wall of the expanded copper column forms a mechanical interference fit with the inner wall of the riveting hole to lock the copper column in the riveting hole.

[0011] Further configuration: The diameter of the fixing bead is 0.7 to 0.9 times the outer diameter of the copper column.

[0012] Further configuration: The depth of the blind hole is 1.1 to 1.6 times the diameter of the fixing bead.

[0013] Further configuration: The diameter of the blind hole is 0.2 to 0.5 mm smaller than the outer diameter of the copper pillar.

[0014] Further configuration: The outer diameter of the copper pillar is the same as the diameter of the riveting hole, or there is an interference difference of 0 to 0.05 mm between them.

[0015] Further details: The lens barrel is made of aluminum alloy, the copper column is made of copper or copper alloy, and the fixing bead is made of steel or hard alloy.

[0016] Further settings: the outer diameter of the copper pillar is 1.5 mm, the diameter of the blind hole is 1.1 mm, the depth of the blind hole is 1.5 mm, and the diameter of the fixing bead is 1.2 mm.

[0017] In summary, this invention offers the following advantages: By employing a forced bulging mechanism where the diameter of the fixing bead is larger than the diameter of the blind hole, a high-interference fit is achieved between the outer wall of the copper column and the through hole of the lens barrel. The measured pull-out force consistently reaches over 200N, far exceeding the industry requirement of ≥160N. The copper column-lens interface is purely mechanically locked, eliminating the risk of adhesive aging and ensuring higher long-term reliability. The bulging amount is determined by the difference in fixed dimensions between the steel bead and the blind hole. The assembly can be quickly determined by measuring the protrusion height of the copper column after pressing, enabling full-process online monitoring without relying on easily fluctuating factors such as adhesive volume or curing time. Assembly consistency and pass rate are improved to 100%. The entire assembly process is performed at room temperature, avoiding thermal stress or melt-down risks in the thin-walled aluminum lens barrel, preventing optical axis misalignment and surface deformation. Fixing beads can be flexibly selected for different copper column diameters and operating loads, achieving a series of compatible products. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure before riveting in Example 1;

[0019] Figure 2 This is a schematic diagram of the structure after riveting in Example 1.

[0020] In the diagram, 1 is the lens barrel; 2 is the copper pillar; 3 is the riveting hole; 4 is the blind hole; and 5 is the fixing bead. Detailed Implementation

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

[0022] Example 1:

[0023] like Figure 1 , Figure 2 As shown, a vehicle-mounted integrated mirror tube assembly includes:

[0024] The end of the lens barrel 1 is provided with a riveting hole 3;

[0025] A copper pillar 2 is inserted into the riveting hole 3, and a blind hole 4 is provided at one end of the copper pillar 2 facing the bottom of the riveting hole 3.

[0026] Fixing bead 5, the fixing bead 5 is disposed in the riveting hole 3 and embedded in the blind hole 4;

[0027] The diameter of the fixing bead 5 is larger than the diameter of the blind hole 4, so that after the fixing bead 5 is embedded in the blind hole 4, it causes the outer wall of the copper pillar 2 to undergo radial plastic expansion at the blind hole 4. The expanded outer wall of the copper pillar 2 forms a mechanical interference fit with the inner wall of the riveting hole 3, thereby locking the copper pillar 2 in the riveting hole 3. The lens barrel 1 is made of aluminum alloy, the copper pillar 2 is made of copper or copper alloy, and the fixing bead 5 is made of steel or hard alloy.

[0028] The lens barrel 1 has three evenly distributed riveting holes 3 at one end, with a diameter D = 1.50 mm and an axial direction parallel to the optical axis. The copper pillar 2 has an outer diameter of 1.50 mm and a length of 7.70 mm, with a blind hole 4 machined at one end. The blind hole 4 has a diameter d1 = 1.10 mm and a depth h = 1.50 mm. The fixing bead 5 has a diameter d = 1.20 mm and a Rockwell hardness of HRC63.

[0029] Assembly steps:

[0030] Clean the inner wall of the rivet hole 3, the copper pillar 2, and the surface of the fixing bead 5 of the lens barrel 1;

[0031] Insert the fixing bead 5 into the bottom of the rivet hole 3;

[0032] Align the end of the copper column 2 with the blind hole 4 with the fixing bead 5 and press it in one go on a hydraulic press with a constant stroke of 0.35mm and a pressure limit of 0.90kN.

[0033] The height of the outer end face of the copper pillar 2 protruding from the outer surface of the lens tube 1 is measured to be 0.10±0.02mm. If the protrusion value exceeds the tolerance, it is judged as improper assembly.

[0034] Pull-out force tests were conducted on multiple batches of automotive integrated mirror barrel assemblies. The test results are shown in the table below:

[0035] batch Sample number 160N test 196N test Batch 1 Batch 1 - Sample 1 Not pulled out Not pulled out Batch 1 Batch 1 - Sample 2 Not pulled out Not pulled out Batch 1 Batch 1 - Sample 3 Not pulled out Not pulled out Batch 1 Batch 1 - Sample 4 Not pulled out Not pulled out Batch 1 Batch 1 - Sample 5 Not pulled out Not pulled out Batch 2 Batch 2 - Sample 1 Not pulled out Not pulled out Batch 2 Batch 2 - Sample 2 Not pulled out Not pulled out Batch 2 Batch 2 - Sample 3 Not pulled out Not pulled out Batch 2 Batch 2 - Sample 4 Not pulled out Not pulled out Batch 2 Batch 2 - Sample 5 Not pulled out Not pulled out Batch 3 Batch 3 - Sample 1 Not pulled out Not pulled out Batch 3 Batch 3 - Sample 2 Not pulled out Not pulled out Batch 3 Batch 3 - Sample 3 Not pulled out Not pulled out Batch 3 Batch 3 - Sample 4 Not pulled out Not pulled out Batch 3 Batch 3 - Sample 5 Not pulled out Not pulled out

[0036] All samples failed the pull-out force tests at 160N and 196N, achieving a pass rate of 100%.

[0037] Example 2:

[0038] Under the premise that the structural materials are the same as in Example 1, the diameter ratios d / D of the fixed bead 5 / copper column 2 are selected as 0.75 and 0.88 as the lower limit sample and upper limit sample for testing. The depth of the blind hole 4 is 1.35mm and 1.65mm according to the ratio, and the other parameters are the same as in Example 1.

[0039] After completing the assembly steps as required, a pull-out force test was performed on the assembled lens barrel. The test results are as follows:

[0040]

[0041]

[0042] All samples failed the pull-out force tests at 160N and 196N, achieving a pass rate of 100%.

[0043] As can be seen from the above embodiments, this utility model, through a fixed bead-blind hole-expansion mechanism, can achieve a one-time bonding without using adhesives or introducing welding heat-affected zones. The copper column is reliably locked to the lens barrel, ensuring 100% assembly qualification and a pull-out force of ≥160N (preferably ≥200N). This invention offers the following advantages: Through a forced bulging mechanism where the diameter of the fixing bead is larger than the diameter of the blind hole, a high interference fit is formed between the outer wall of the copper column and the through hole in the lens barrel; the measured pull-out force consistently reaches over 200N, far exceeding the industry requirement of ≥160N; the copper column-lens interface is purely mechanically locked, eliminating the risk of adhesive aging and ensuring higher long-term reliability. The bulging amount is determined by the difference in fixed dimensions between the steel bead and the blind hole. Assembly quality can be quickly determined by measuring the protrusion height of the copper column after pressing, enabling full-process online monitoring without relying on easily fluctuating factors such as adhesive volume or curing time, thus improving assembly consistency and qualification rate to 100%. The entire assembly process is carried out at room temperature, avoiding thermal stress or melt-down risks in the thin-walled aluminum lens barrel, preventing optical axis misalignment and surface deformation. Fixing beads can be flexibly selected for different copper column diameters and operating loads, achieving a series of coverage options.

[0044] Those skilled in the art can make equivalent substitutions within the stated proportions and material ranges, all of which fall within the protection scope of this utility model.

[0045] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A vehicle-mounted integrated mirror tube assembly, characterized in that, include: The end of the lens barrel is provided with a riveting hole; A copper post is inserted into the rivet hole, and a blind hole is provided at the end of the copper post facing the bottom of the rivet hole; A fixing bead is disposed in the rivet hole and embedded in the blind hole; The diameter of the fixing bead is larger than the diameter of the blind hole, so that after the fixing bead is embedded in the blind hole, it causes the outer wall of the copper column to undergo radial plastic expansion at the blind hole. The outer wall of the expanded copper column forms a mechanical interference fit with the inner wall of the riveting hole to lock the copper column in the riveting hole.

2. The vehicle-mounted integrated mirror tube assembly according to claim 1, characterized in that, The diameter of the fixing bead is 0.7 to 0.9 times the outer diameter of the copper column.

3. The vehicle-mounted integrated mirror tube assembly according to claim 1, characterized in that, The depth of the blind hole is 1.1 to 1.6 times the diameter of the fixed bead.

4. The vehicle-mounted integrated mirror tube assembly according to claim 1, characterized in that, The diameter of the blind hole is 0.2 to 0.5 mm smaller than the outer diameter of the copper pillar.

5. The vehicle-mounted integrated mirror tube assembly according to claim 1, characterized in that, The outer diameter of the copper pillar is the same as the diameter of the riveting hole, or there is an interference difference of 0 to 0.05 mm between them.

6. The vehicle-mounted integrated mirror barrel assembly according to claim 1, characterized in that, The lens barrel is made of aluminum alloy, the copper column is made of copper or copper alloy, and the fixing bead is made of steel or hard alloy.

7. The vehicle-mounted integrated mirror barrel assembly according to claim 1, characterized in that, The outer diameter of the copper pillar is 1.5 mm, the diameter of the blind hole is 1.1 mm, the depth of the blind hole is 1.5 mm, and the diameter of the fixing bead is 1.2 mm.

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