Screw hole mounting structure and automobile lamp

Abstract

The invention discloses a screw hole mounting structure and an automobile lamp. The screw hole mounting structure comprises a screw column arranged on a lamp shell and an automobile mounting screw matched with the screw column. The loading screw is sequentially provided with a lamp end mounting thread, a pan head and a vehicle body end mounting thread from one end to the other end, and the lamp end mounting thread comprises a main thread and an auxiliary thread which are distributed in a staggered mode; the screw column comprises a screw column body, a screw mounting hole formed in the screw column body, a plurality of thickening parts arranged on the outer peripheral side of the opening end part of the screw column body, and at least two chip grooves formed in the inner peripheral side of the opening end part of the screw column body; the outer diameter of the main thread is d3, the outer diameter of the auxiliary thread is d4, the screw mounting hole is an unthreaded hole, the inner diameter of the screw mounting hole is d1, and d3 > d4 > d1. According to the invention, chips can be effectively removed in the screw mounting process, and the fixing effect between the loading screw and the screw column is improved on the basis of ensuring the strength.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle lamps, and in particular to a screw hole mounting structure and a vehicle lamp. Background Art

[0002] At present, in the prior art, a mounting point is usually provided on the lamp housing of a car lamp, which is used to fix the lamp to the body sheet metal. The mounting point is usually provided with a mounting screw, and threads are respectively provided at both ends of the mounting screw. One end of the mounting screw is fixed to the lamp housing, and the other end of the mounting screw is fixed to the body sheet metal. However, the mounting screw generally adopts ordinary threads. In the process of matching and installing with the lamp housing, it is easy to have problems such as poor chip removal and excessive residual chips, which leads to cracking and failure of the screw mounting hole, thereby affecting the subsequent service life; at the same time, the existing mounting screws and screw columns are not fine enough in matching structure and size, lack of effective positioning, resulting in distortion and looseness after fixing, and long-term use will lead to poor fastening effect and easy loosening and falling off; in addition, in order to achieve a firm fixing effect, some mounting screws and screw column structures will also sacrifice the strength of the structure to increase the size, and design special-shaped structures to increase the contact area, but on the one hand, the strength is reduced for a long time and it is easy to crack and fail, and on the other hand, it will cause waste of screw column space, increase material cost and assembly time. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a screw hole mounting structure and an automobile lamp, which can effectively remove chips during the screw installation process and improve the fixing effect between the mounting screw and the screw column while ensuring the strength.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: A screw hole mounting structure and a car lamp, wherein the screw hole mounting structure comprises a screw column arranged on a lamp housing and a matching mounting screw; The mounting screw has a lamp end mounting thread, a pan head and a vehicle body end mounting thread in sequence from one end to the other end, and the lamp end mounting thread includes a main thread and a secondary thread that are staggered; The screw column comprises a screw column body, a screw mounting hole provided on the screw column body, a plurality of thickened portions provided on the outer peripheral side of the open end of the screw column body, and at least two chip removal grooves provided on the inner peripheral side of the open end of the screw column body; The outer diameter of the main thread is d3, the outer diameter of the secondary thread is d4, the screw mounting hole is a smooth hole with an inner diameter of d1, then d3>d4>d1; The open end surface of the screw column body is a screw mounting surface. When the loading screw is screwed into the screw mounting hole, the pan head abuts against the screw mounting surface and is limited by the peripheral thickened portion.

[0005] Furthermore, the thickened portion corresponds to the position of the chip removal groove, and the upper end surface of the thickened portion is higher than the screw installation surface.

[0006] Furthermore, a guiding slope is provided at the edge of the mouth of the screw mounting hole.

[0007] Furthermore, reinforcing ribs are provided on the periphery of the back side of the screw column body.

[0008] Furthermore, the main thread and the secondary thread have the same tooth profile and tooth profile angle, the tooth profile is triangular, and the tooth profile angle is 30°.

[0009] Furthermore, the length of the lamp end mounting thread is H2, and the depth of the screw mounting hole is H1, then H2

[0010] Furthermore, the outer diameter of the main thread is d3, then H2=1.8d3-2.3d3.

[0011] Furthermore, the inner diameter of the screw mounting hole is d1, and the outer diameter of the screw column body is d2, then d1=0.7d3-0.8d3, d2≥2d3.

[0012] Furthermore, the included angle between the inner wall of the screw mounting hole and the central axis is a1, the inclination angle of the chip removal groove is a2, and the inclination angle of the thickened portion is a3, then a2=a3=10a1.

[0013] An automobile lamp of the present invention comprises the above-mentioned screw hole mounting structure.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects: 1. The present invention arranges a chip groove on the screw column, and designs a staggered distribution of the main thread and the secondary thread on the mounting thread of the lamp end of the loading screw, and the outer diameter d3 of the main thread is larger than the outer diameter d4 of the secondary thread, which is larger than the inner diameter d1 of the screw mounting hole, so that the friction resistance of the loading screw during the installation process is small, which can effectively improve the chip removal efficiency and the fastening effect, ensure firm fixation, avoid installation obstruction due to poor chip removal, cracking of the screw column, loosening and falling off of the loading screw, and other problems, and effectively extend the subsequent service life.

[0015] ​2. The present invention adopts the design of the thickened portion on the screw column and the screw mounting surface, so that when the loading screw is assembled with the screw column, the pan head and the screw mounting surface are abutted against each other and the pan head is limited by the peripheral thickened portion. In addition, the outer diameter d3 of the main thread and the outer diameter d4 of the secondary thread of the loading screw are both larger than the inner diameter d1 of the screw mounting hole, so that the fixing between the loading screw and the screw column is more secure, the positioning effect and the tightening effect are better, and the strength can also be guaranteed.

[0016] 3. The tooth profile and tooth profile angle of the main thread and the secondary thread of the present invention are the same, and the tooth profile is triangular and the tooth profile angle is 30°, which can achieve better cutting performance, reduce the friction resistance during the installation of the loading screws, and ensure the alignment and smoothness of the assembly.

[0017] 4. The length H2 of the mounting thread at the end of the lamp is designed in the present invention to be smaller than the depth H1 of the screw mounting hole, and H1-H2≥1mm, so that there is a chip removal space at the bottom of the screw mounting hole, which is convenient for downward chip removal during the installation of the screw, and further prevents installation obstruction or even cracking of the screw column caused by poor chip removal.

[0018] 5. The present invention designs the length H2 of the lamp end mounting thread to be equal to 1.8-2.3 times the outer diameter d3 of the main thread, so that it is possible to reasonably set the length of the lamp end mounting thread according to the outer diameter of the main thread, which can effectively ensure the connection strength between the loading screw and the screw column. On the basis of ensuring the strength and fixing effect, it can also reduce the waste of screw column space, reduce material costs, and reduce assembly time.

[0019] 6. The inner diameter d1 of the screw mounting hole designed in the present invention is equal to 0.7-0.8 times the outer diameter d3 of the main thread, and the outer diameter d2 of the screw column body is ≥ 2d3, so that it is easy to match the loading screw with the screw mounting hole, increase the strength between the loading screw and the screw column, and further prevent the loading screw from loosening after installation, so that the loading screw and the screw column are firmly fixed, the fastening effect is better, and it is not easy to fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure decomposition of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a mounting screw according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the front structure of a screw column according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the back structure of a screw column according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the screw column according to an embodiment of the present invention; Figure 6 It is a schematic cross-sectional structure diagram of the assembly of the loading screw and the screw column according to the embodiment of the present invention; Figure 7 For the embodiment of the present invention Figure 3 One of the cross-sectional structural diagrams of the screw column with a medium AA section; Figure 8 The second schematic diagram of the cross-sectional structure of the screw column according to the embodiment of the present invention; Among them, 110. loading screw; 111. lamp end mounting thread; 1111. main thread; 1112. secondary thread; 112. vehicle body end mounting thread; 113. pan head; 120. screw column; 121. screw column body; 122. screw mounting hole; 123. thickened part; 124. screw mounting surface; 125. chip groove; 126. guide slope; 127. reinforcing rib; 200. lamp housing. DETAILED DESCRIPTION

[0021] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0022] like Figure 1-8 As shown, in this embodiment, a screw hole mounting structure and an automobile lamp are provided. The screw hole mounting structure is mainly composed of a screw column 120 injection-molded on a lamp housing 200 and a matching mounting screw 110 .

[0023] refer to Figure 1 As shown, the lamp housing 200 is a plastic part, the screw column 120 is injection molded on the lamp housing 200, and the loading screw 110 can be rotatably screwed into the screw column 120 to form a connection and fixation.

[0024] refer to Figure 2 As shown, the design of the loading screw 110 has a lamp end mounting thread 111, a pan head 113 and a vehicle body end mounting thread 112 from one end to the other end. The pan head 113 is located in the middle and has the largest outer diameter. The lamp end mounting thread 111 is used to screw into the screw column 120, and the vehicle body end mounting thread 112 is a common thread used to connect and fix with the vehicle body. The specific lamp end mounting thread 111 includes a staggered main thread 1111 and a secondary thread 1112, and the outer diameter of the main thread 1111 is d3, and the outer diameter of the secondary thread 1112 is d4, d3>d4, that is, the secondary thread tooth height is less than the main thread tooth height. This structure can further reduce the friction resistance of the loading screw during the installation process, and the chip removal efficiency is higher, preventing the installation process from being blocked due to poor chip removal or even the screw column cracking.

[0025] refer to Figure 3-7As shown, the screw column 120 specifically includes a screw column body 121, a screw installation hole 122 opened on the screw column body 121, a plurality of thickened portions 123 arranged on the outer peripheral side of the open end of the screw column body 121, and at least two chip grooves 125 opened on the inner peripheral side of the open end of the screw column body 121. Taking this embodiment as an example, three chip grooves 125 are designed and evenly distributed along the circumferential direction, and three corresponding thickened portions 123 are also arranged, and the thickened portions 123 correspond to the positions of the chip grooves 125. Since the chip grooves 125 are opened, the strength of the screw column body 121 is reduced, so the thickened portions 123 are arranged to increase the strength of the screw column body 121. In this embodiment, a chip groove 125 is provided on the screw column 120, and a main thread 1111 and a secondary thread 1112 are designed to be staggered on the mounting thread 111 at the lamp end of the loading screw 110, and the outer diameter d3 of the main thread is larger than the outer diameter d4 of the secondary thread, so that the friction resistance of the loading screw 110 during the installation process is small, which can effectively improve the chip removal efficiency and the fastening effect, ensure firm fixation, avoid problems such as installation obstruction, cracking of the screw column, loosening and falling off of the loading screw due to poor chip removal, and effectively extend the subsequent service life.

[0026] Meanwhile, the screw mounting hole 122 is a smooth hole with an inner diameter of d1, the outer diameter of the main thread 1111 is d3, and the outer diameter of the secondary thread 1112 is d4, thus satisfying d3>d4>d1, and achieving a better fixing effect.

[0027] In addition, the open end face of the screw column body 121 is the screw mounting surface 124. When the loading screw 110 is tightened into the screw mounting hole 122, the pan head 113 is abutted against the screw mounting surface 124 and the pan head 113 is limited by the peripheral thickened portion 123. At the same time, the upper end face of the thickened portion 123 is higher than the screw mounting surface 124, which facilitates the pan head 113 of the loading screw 110 to self-position on the screw mounting surface 124 without being skewed, thereby ensuring a stable positioning effect. Through the design of the thickened portion 123 on the screw column and the screw mounting surface 124, when the loading screw 110 and the screw column 120 are assembled, the pan head 113 and the screw mounting surface 124 are abutted against each other and the pan head 113 is limited by the peripheral thickened portion 123. In addition, the outer diameter d3 of the main thread and the outer diameter d4 of the secondary thread of the loading screw are both larger than the inner diameter d1 of the screw mounting hole, so that the fixation between the loading screw and the screw column is more secure, the positioning effect and the tightening effect are better, and the strength can also be guaranteed.

[0028] In order to facilitate the rapid screwing in of the loading screw 110, a guide slope 126 is provided at the edge of the mouth of the screw installation hole 122 of the present embodiment, which is conducive to guiding the screw during the screwing in of the loading screw 110. At the same time, a reinforcing rib 127 is provided at the outer periphery of the back side of the screw column body 121 of the present embodiment, which can effectively increase the strength of the screw column 120 and prevent the screw column 120 from cracking when the loading screw 110 is installed.

[0029] It is worth mentioning that the main thread 1111 and the secondary thread 1112 in this embodiment have the same tooth profile and tooth profile angle, the tooth profile is triangular, and the tooth profile angle is 30°. Since the screw column 120 is a plastic part, the screw mounting hole 122 is a light hole rather than a threaded hole, in order to achieve better cutting performance, reduce the friction resistance during the installation of the loading screw 110, and ensure the alignment and smoothness of the assembly, the tooth profile of the main thread 1111 and the secondary thread 1112 can be designed to be triangular, and the tooth profile angle is 30°.

[0030] refer to Figure 2 , 6 As shown in FIG. 8 , the length of the lamp end mounting thread 111 in this embodiment is H2, and the depth of the screw mounting hole 122 is H1, then H2

[0031] At the same time, the outer diameter of the main thread 1111 in this embodiment is d3, then H2=1.8d3-2.3d3. Designed in this way, this structure can reasonably set the length of the mounting thread at the lamp end according to the outer diameter of the main thread, which can effectively ensure the connection strength between the loading screw and the screw column. On the basis of ensuring the strength and fixing effect, it can also reduce the waste of screw column space, reduce material costs, and reduce assembly time. In other words, if H2<1.8d3, the contact area between the loading screw and the screw column mounting hole will be small, and the fixing effect will be poor; if H2>2.3d3, it will cause a waste of screw column space, increase the time to install the screw, and increase material costs and labor costs.

[0032] Furthermore, the inner diameter of the screw mounting hole 122 in this embodiment is d1, and the outer diameter of the screw column body 121 is d2, then d1=0.7d3-0.8d3, d2≥2d3. Such a design can facilitate the matching of the mounting screw and the screw mounting hole, increase the strength between the mounting screw and the screw column, prevent the mounting screw from loosening after installation, and make the mounting screw and the screw column firmly fixed, with better fastening effect and not easy to fall off.

[0033] refer to Figure 8 ​As shown, in order to facilitate the injection molding of the screw column, the angle between the inner wall of the screw mounting hole 122 and the central axis in this embodiment is a1, the inclination angle of the chip groove 125 is a2, and the inclination angle of the thickened portion 123 is a3, then a2=a3=10a1 is satisfied, and a1 is preferably 0.5°.

[0034] Of course, this embodiment also provides a car lamp, which includes the above-mentioned screw hole installation structure and naturally has all the above-mentioned features and advantages, which will not be repeated here.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above specific embodiments further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw hole installation structure, characterized in that: It comprises a screw column (120) arranged on the lamp housing and a matching mounting screw (110); The mounting screw (110) has a lamp end mounting thread (111), a pan head (113), and a vehicle body end mounting thread (112) in sequence from one end to the other end, and the lamp end mounting thread (111) includes a main thread (1111) and a secondary thread (1112) that are alternately distributed; The screw column (120) comprises a screw column body (121), a screw mounting hole (122) provided on the screw column body (121), a plurality of thickened portions (123) provided on the outer peripheral side of the open end of the screw column body (121), and at least two chip removal grooves (125) provided on the inner peripheral side of the open end of the screw column body (121); The outer diameter of the main thread (1111) is d3, the outer diameter of the secondary thread (1112) is d4, the screw mounting hole (122) is a smooth hole with an inner diameter of d1, then d3>d4>d1; The open end surface of the screw column body (121) is a screw mounting surface (124); when the loading screw (110) is screwed into the screw mounting hole (122), the pan head (113) abuts against the screw mounting surface (124) and the pan head (113) is limited by the peripheral thickened portion (123).

2. A screw hole installation structure according to claim 1, characterized in that: The thickened portion (123) corresponds to the position of the chip removal groove (125), and the upper end surface of the thickened portion (123) is higher than the screw installation surface (124).

3. The screw hole installation structure according to claim 1, characterized in that: A guiding inclined surface (126) is provided at the mouth edge of the screw mounting hole (122).

4. The screw hole installation structure according to claim 1, characterized in that: A reinforcing rib (127) is provided on the periphery of the back side of the screw column body (121).

5. The screw hole installation structure according to claim 1, characterized in that: The main thread (1111) and the secondary thread (1112) have the same tooth profile and tooth profile angle, the tooth profile is triangular, and the tooth profile angle is 30°.

6. A screw hole mounting structure according to any one of claims 1 to 5, characterized in that: The length of the lamp end mounting thread (111) is H2, and the depth of the screw mounting hole (122) is H1, then H2<H1, and H1-H2≥1mm.

7. The screw hole installation structure according to claim 6, characterized in that: The outer diameter of the main thread (1111) is d3, so H2=1.8d3-2.3d3.

8. The screw hole installation structure according to claim 7, characterized in that: The inner diameter of the screw mounting hole (122) is d1, and the outer diameter of the screw column body (121) is d2, then d1=0.7d3-0.8d3, d2≥2d3.

9. The screw hole installation structure according to claim 6, characterized in that: The included angle between the inner wall of the screw mounting hole (122) and the central axis is a1, the inclination angle of the chip removal groove (125) is a2, and the inclination angle of the thickened portion (123) is a3, then a2=a3=10a1.

10. An automobile lamp, characterized in that: It comprises the screw hole mounting structure as described in any one of claims 1 to 9.

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