Vehicle-rod-free screw capable of not falling off

Abstract

The invention relates to the technical field of screws, in particular to a rod-turning-free unthreaded screw, one end of a thread-free polished rod section and one end of a screw head are integrally formed, and the other end of the thread-free polished rod section and one end of an external thread section are integrally formed; a plurality of circles of effective external threads are arranged on the outer side of the external thread section, the tooth mountain angle of the external threads is 33 degrees, and nylon glue is sprayed on the thread faces of the external threads. Compared with the prior art, the rod-turning-free non-disengagement screw is beneficial to reducing the batch manufacturing cost of the non-disengagement screw, improving the structural precision of the non-disengagement screw, achieving upsetting of the non-disengagement screw, being not limited to a linear groove, being capable of selecting more driving groove types, preventing the non-disengagement screw from vibrating and loosening, and improving the machining precision of the non-disengagement screw. The production batch stability of the non-separation screw is improved, the reject ratio is reduced, the overall performance and the application assembly effect of the non-separation screw are improved, the used wire diameter is small, the weight of needed materials is reduced, the product weight reduction design is facilitated, and the non-separation screw is more environmentally friendly.

Description

[Technical field]

[0001] The invention relates to the technical field of screws, in particular to a rod-free screw that does not fall out. [Background technology]

[0002] Capable screws are usually used in places that need to be disassembled repeatedly to prevent the screws from falling off and being lost after being screwed out. After the internal threads are screwed out, they can be kept hanging on the panel for future use. For example, chassis housings, battery covers, module fixings, etc.

[0003] The main feature of the non-slip screw is that the polished rod diameter d1 < the inner thread minor diameter D1 < the outer thread diameter D. When the screw is screwed out from the inner thread bottom hole, the toothless polished rod section can rotate freely and slide back and forth in the panel through hole.

[0004] According to GB192, the minor diameter of the internal thread D1 = the outer diameter of the thread D-1.082531754 pitch P. Since D1 is smaller than the rolling diameter, in order to prevent the screw from coming out, the overall turning process is usually used or an additional process is added after upsetting the polished nail to specially turn the small polished rod section.

[0005] The existing screws that do not fall out are mostly machined as a whole or upset and then turned into a small rod diameter, which has many processes, slow operation, high batch cost, and the turned polished rod section is prone to poor processing, resulting in blocked threads or polished rods and unusable. [Summary of the invention]

[0006] In order to overcome the above problems, the present invention provides a rod-proof screw that can effectively solve the above problems.

[0007] A technical solution provided by the present invention to solve the above technical problems is: to provide a non-turning rod-proof screw, comprising a screw head, a toothless rod section and an external thread section, one end of the toothless rod section is integrally formed with one end of the screw head, and the other end of the toothless rod section is integrally formed with one end of the external thread section; a plurality of effective external threads are arranged on the outer side of the external thread section; the tooth mountain angle of the external thread is 33°, and nylon glue can be sprayed on the thread surface of the external thread.

[0008] Preferably, the nylon glue is distributed on both sides of the tooth plate.

[0009] Preferably, the outer thread has an asymmetric design of the tooth angle, with an angle of 5° in the exit direction and an angle of 28° in the forward direction.

[0010] Preferably, the turning-free and non-slipping screws can be made of a variety of upset materials, or can be made of alloy steel that has been quenched and tempered to achieve higher strength.

[0011] Preferably, the outer side of the screw head can be equipped with various upset or milled drive grooves.

[0012] Compared with the prior art, the turning-free non-slipping screw of the present invention is beneficial to reducing the batch manufacturing cost of the non-slipping screw, improving the structural accuracy of the non-slipping screw, and realizing the upsetting of the non-slipping screw. It is not necessary to be limited to the one-slot groove, and more drive groove types can be selected to prevent the non-slipping screw from vibrating and loosening. The batch stability of the non-slipping screw production is improved, the defective rate is reduced, the overall performance and application assembly effect of the non-slipping screw are improved, a smaller wire diameter is used, the weight of the required materials is reduced, the material utilization rate is higher, it is more environmentally friendly, and it can also help to effectively reduce the weight of assembled products.

Brief Description of the Drawings

[0013] Figure 1 It is a side view of the invention that prevents the rod from falling out of the screw;

[0014] Figure 2 It is a top view of the invention in which the rod is prevented from falling out of the screw;

[0015] Figure 3 for Figure 1 Enlarged view of position A in the middle locking state;

[0016] Figure 4 for Figure 1 Enlarged view of position A when the watch is rotated out from the middle. [Specific implementation method]

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0019] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] See also Figures 1 to 4The non-turning rod-stripping screw of the present invention comprises a screw head 11, a toothless rod section 12 and an external thread section 13. One end of the toothless rod section 12 is integrally formed with one end of the screw head 11, and the other end of the toothless rod section 12 is integrally formed with one end of the external thread section 13. The outer side of the external thread section 13 is provided with a plurality of effective external threads 131. The external thread 131 is used to be screwed into the internal thread hole 31 of the installation part 30. The outer side of the screw head 11 can be equipped with various upset or milling drive grooves 111, such as cross slots, hexagon sockets, hexagon sockets, etc., for screwing with a screwdriver.

[0021] The standard thread 50 of the prior art non-stripping screw is limited by the basic elements of the tooth mountain angle of 60°, the pitch, the thread minor diameter, and the thread major diameter. The tolerance of the bare nail diameter is usually only within the range of 0.03 to 0.10 mm. Therefore, according to the standard bare nail diameter, it cannot be < the internal thread minor diameter D1, and usually it needs to be further reduced.

[0022] In order to meet the actual matching standard internal thread, it is necessary to first keep the pitch and major diameter of the thread unchanged, which is the prerequisite.

[0023] In order to achieve sufficient material for forming with a smaller bare nail diameter, the present invention's non-turning rod-free screw has specially modified and redesigned the tooth plate of the external thread 131. The tooth angle of the external thread 131 is asymmetrically designed, and the tooth angle a1 is reduced to 33° and the thread diameter is reduced to obtain sufficient material and ensure that it is within the range of material ductility. After practical trial mold making and mass production, the screws produced can meet the prerequisite basis and the actual matching verification meets the functional requirements. The tooth angle a2 of the existing technical standard is 60°.

[0024] In order to compensate for the loosening of the fit between the internal and external threads due to the thinning of the tooth mountain, the rod-free and non-slipping screw of the present invention can be sprayed with nylon glue 60 on the thread surface of the external thread after the screw is formed. The nylon glue 60 is distributed on both sides of the tooth plate 131. The nylon glue can fill the fitting gap between the internal and external threads, increase the friction between the contact surfaces of the internal and external threads, thereby increasing the rotational resistance, slowing down the free loosening of the screw due to vibration, and improving the overall fastening performance.

[0025] In order to make the nylon glue resistance more effective in preventing withdrawal, the outer thread 131 has an asymmetric design of the tooth angle, with the angle a3 in the withdrawal direction being only 5° and the angle a4 in the forward direction being 28°. This design allows more nylon glue to gather on the withdrawal side, increasing the friction of the thread contact surface when withdrawing.

[0026] The toothless polished rod section 12 is directly upset on the main mold without secondary processing, has a small outer diameter jump, and has better surface finish and concentricity, and can be more stably and freely matched with the through hole 21 of the panel 20.

[0027] The non-turning rod and non-slipping screw can be made of a variety of upset materials, or can be made of alloy steel that has been heat-quenched and tempered to improve the overall structural strength of the screw and compensate for the strength loss caused by the thinning of the tooth mountain to achieve higher strength.

[0028] Implemented trial production of a M3-P0.5 specification pan head non-slip screw;

[0029] According to GB837, the whole process needs to be turned, or the standard polished nail diameter of 2.6 needs to be turned down to 1.86-2.0mm after upsetting, which results in low production efficiency and high processing cost.

[0030] According to the invention, the thread plate is designed and developed without turning the rod and without dislodging the screw, and the thread diameter of 2.41-2.45 [smaller than the minor diameter D1 of the M3 internal thread: 2.46min] can be directly upset to roll half thread, and the thread diameter and pitch are in line with the standard thread, and the standard internal thread can be matched smoothly, and the hanging hole is free and stable;

[0031] In order to improve the thread fastening performance, you can choose to spray solid nylon glue on the thread section to reduce vibration loosening;

[0032] You can also choose to heat treat alloy steel to improve the overall strength of the screw;

[0033] After mass production and batch application functional verification, this solution can be implemented.

[0034] Compared with the prior art, the turning-free non-slipping screw of the present invention is beneficial to reducing the batch manufacturing cost of the non-slipping screw, improving the structural accuracy of the non-slipping screw, and realizing the upsetting of the non-slipping screw. It is not necessary to be limited to the one-slot groove, and more drive groove types can be selected to prevent the non-slipping screw from vibrating and loosening. The batch stability of the non-slipping screw production is improved, the defective rate is reduced, the overall performance and application assembly effect of the non-slipping screw are improved, a smaller wire diameter is used, the weight of the required materials is reduced, the material utilization rate is higher, it is more environmentally friendly, and it can also help to effectively reduce the weight of assembled products.

[0035] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.

Claims

1. The rod does not come out of the screw, the characteristics are: It comprises a screw head, a toothless polished rod section and an external thread section, wherein one end of the toothless polished rod section is integrally formed with one end of the screw head, and the other end of the toothless polished rod section is integrally formed with one end of the external thread section; The outer side of the external thread section is provided with multiple turns of effective external threads; The outer thread has a crest angle of 33°, and the thread surface of the outer thread can be sprayed with nylon glue.

2. The non-slip screw for preventing the vehicle rod from falling out according to claim 1, characterized in that: The nylon glue is distributed on both sides of the tooth plate.

3. The non-slip screw for preventing the vehicle rod from falling out according to claim 1, characterized in that: The outer thread has an asymmetric design of the tooth angle, with an angle of 5° in the exit direction and an angle of 28° in the forward direction.

4. The non-slip screw for preventing the vehicle rod from falling out according to claim 1, characterized in that: The turning-free and non-slipping screws can be made of a variety of upset materials, or can be made of alloy steel that has been quenched and tempered to achieve higher strength.

5. The non-slip screw for preventing the vehicle rod from falling out according to claim 1, characterized in that: The outer side of the screw head can be equipped with various driving grooves of upsetting or turning.

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