Scratch-proof long-rod bolt structure for automobile and preparation process

Abstract

The invention provides a scratch-proof long-rod bolt structure for an automobile and a preparation technology, and relates to the technical field of long-rod bolts for automobiles, the scratch-proof long-rod bolt structure comprises a long-rod bolt main body, a first-stage protection pipe and a second-stage protection pipe, the long-rod bolt main body comprises a round rod, a bolt head is integrally formed at one end of the round rod, and a threaded rod is integrally formed at the other end of the round rod; the round rod is sleeved with the first-stage protection pipe and the second-stage protection pipe, a spring is arranged between one end of the first-stage protection pipe and one end of the second-stage protection pipe, and the spring is sleeved with a protection rubber sleeve; according to the technical scheme, protection is formed outside the threaded rod and the round rod through the second-stage protection pipe, protection is formed outside the round rod through the cooperation of the spring and the protection rubber sleeve and the first-stage protection pipe, and no matter which impact the long-rod bolt body is, the long-rod bolt body can be protected in the mode that the first-stage protection pipe and the second-stage protection pipe slide and rotate outside the round rod. The surface of the long-rod bolt body is prevented from being scratched, and the normal function of the long-rod bolt body is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of automobile long-rod bolts, in particular to a scratch-resistant automobile long-rod bolt structure and a preparation process. Background Art

[0002] Threaded fasteners are devices that connect car parts. They are the parts that car maintenance technicians come into contact with the most. Hundreds of fasteners are used in modern cars. The most common fasteners for car parts use metric (meter) threads. A small number of imported cars from the United States and the United Kingdom may use inch threads (UNC, UNF). In addition, some sensors and screw plugs on the car also use cylindrical pipe threads and conical pipe threads.

[0003] The performance grades of bolts for steel connections are divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.8, 6.8, 8.8, 9.8, 10.8, 12.9, etc. Figure 3 Metric fasteners with a grade of 8.8 or higher must be marked. Bolts with a grade of 8.8 or higher are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered). They are generally called high-strength bolts, and the rest are generally called ordinary bolts.

[0004] When using threaded fasteners, you often need to pay attention to:

[0005] Different thread types cannot be substituted for each other, otherwise it will cause thread damage. To prevent damage to the fasteners, when assembling threaded fasteners, you need to tighten the first 3 to 5 turns of the bolt or nut by hand (or fingers) to try;

[0006] According to the direction in which the bolts and nuts are screwed in, they are divided into right-hand and left-hand threads, but left-hand threads are not commonly used and are printed with the letter "L". Right-hand threads are more commonly used. Right-hand threads are tightened by turning clockwise (right-hand tightens, left-hand loosens), and left-hand threads are tightened by turning counterclockwise;

[0007] Using a predetermined tightening torque is the most common method of controlling fastener tension. Axial tension is proportional to the torque applied under certain specific conditions, the most common of which is a clean, dry, good thread. At this point, friction on the thread consumes 40% of the torque used, friction between the bolt head and the mating surface uses 50% of the torque, and the remaining 10% is used to tighten the bolt. Dry surface friction is the greatest, and when the fastener is coated with a lubricant, the friction becomes less.

[0008] There are a large number of bolt fasteners used in automobiles. For long-rod bolts, they often span multiple areas when in use to connect different parts. During the operation of the automobile, the surrounding parts often shake, causing the surface of the bolt to be scratched, reducing the structural strength and service life of the bolt, posing a major safety hazard. Summary of the invention

[0009] In order to overcome the problem that the long-rod bolts used in existing automobiles often cross multiple areas during use, and are easily scratched on the surface of the bolts due to the working shaking of the surrounding components, thereby reducing the structural strength and service life of the bolts, the embodiments of the present application provide a scratch-resistant long-rod bolt structure for automobiles and a preparation process. When the long-rod bolt body is in use, the gasket is sleeved onto the outside of the round rod through the threaded rod, and the primary protective tube, the spring and the secondary protective tube are sleeved on the outside of the round rod in sequence, so that the secondary protective tube forms protection on the outside of the threaded rod and the round rod, and the spring cooperates with the protective rubber sleeve and the primary protective tube to form protection on the outside of the round rod. No matter how much impact the long-rod bolt body is subjected to, it can be resolved by the sliding and rotating method of the primary protective tube and the secondary protective tube on the outside of the round rod, thereby avoiding scratches on the surface of the long-rod bolt body and affecting the structural strength.

[0010] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0011] A scratch-resistant long-rod bolt structure for automobiles, comprising a long-rod bolt body, a primary protective tube, and a secondary protective tube. The long-rod bolt body comprises a round rod, one end of the round rod is integrally formed with a bolt head, and the other end of the round rod is integrally formed with a threaded rod. The primary protective tube and the secondary protective tube are both sleeved onto the outside of the round rod, a spring is provided between one end of the primary protective tube and the secondary protective tube, the outside of the spring is sleeved with a protective rubber sleeve, and the spring is sleeved onto the outside of the round rod.

[0012] In a possible implementation, one end of the primary protection tube and the secondary protection tube are both processed with a tube ring, the two ends of the spring are respectively sleeved on the outside of the two tube rings, and the two end surfaces of the spring are respectively welded and fixed to one end surface of the secondary protection tube and one end surface of the primary protection tube.

[0013] In a possible implementation, one end surface of the secondary protective tube and the primary protective tube are both processed with a receiving ring groove, the inner wall of one side of the receiving ring groove is processed with a circular ring, and the two ends of the protective rubber sleeve respectively extend into the receiving ring groove on the secondary protective tube and the receiving ring groove on the primary protective tube, and are clamped to the outside of the circular ring.

[0014] In a possible implementation, a gasket is sleeved on the outside of one end of the round rod, and the gasket includes a gasket ring, one side of the gasket ring is integrally formed with a gasket sleeve, and the surface of one side of the gasket ring fits with the surface of one side of the bolt head.

[0015] In a possible implementation, a clearance groove is processed inside one end of the primary protection tube, one end of the gasket sleeve is inserted into the interior of the clearance groove, and the outer wall of the gasket sleeve fits with the inner wall of the clearance groove.

[0016] In a possible implementation, the protective rubber sleeve is in a stretched state, and one end of the primary protective tube and the second protective tube are controlled to approach each other to compress the spring.

[0017] A preparation process of a scratch-resistant long-rod bolt for automobiles, comprising:

[0018] S: The steel wire is uncoiled and cut after being straightened to a fixed length;

[0019] S: Cold forging the steel into a shape similar to the body of a long-shank bolt at room temperature;

[0020] S: Pressing the prototype long-stem bolt body into different pressing dies under high pressure to gradually form a semi-finished long-stem bolt body;

[0021] S: Referring to the round rod size on the semi-finished long rod bolt body, the primary protection tube and the secondary protection tube are formed, and the spring is welded between the primary protection tube and the secondary protection tube;

[0022] S: A threaded rod is formed at one end of the long-rod bolt body by rolling;

[0023] S: Place the long-stem bolt body, primary protection tube, secondary protection tube and gasket into a high-temperature environment to harden the steel.

[0024] In one possible implementation, the gap between the surface of the round rod on the long rod bolt body and the inner walls of the primary and secondary protective tubes is fourteen millimeters, and the diameter length of the primary and secondary protective tubes is the same as the diameter length of the existing long rod bolt body.

[0025] In one possible implementation, a gasket is formed on the outside of the round rod in S, and a gap groove formed inside one end of the primary protective tube refers to the outer diameter of the gasket sleeve on the gasket, and the fitting tolerance between the outer wall of the gasket sleeve and the inner wall of the gap groove is twenty-five millimeters.

[0026] The beneficial effects of this application are:

[0027] First, in this solution, when the long-rod bolt body is used, the gasket is sleeved to the outside of the round rod through the threaded rod, and the primary protective tube, the spring and the secondary protective tube are sleeved to the outside of the round rod in sequence, so that the secondary protective tube forms protection on the outside of the threaded rod and the round rod, and the spring cooperates with the protective rubber sleeve and the primary protective tube to form protection on the outside of the round rod. No matter how much impact the long-rod bolt body is subjected to, it can be resolved by the sliding and rotating method of the primary protective tube and the secondary protective tube on the outside of the round rod, so as to avoid scratches on the surface of the long-rod bolt body and affect the structural strength of the long-rod bolt body;

[0028] Second, in this solution, by making the long rod bolt body use the primary protective tube, the secondary protective tube and the gasket to compensate for the reduced size of the long rod bolt body compared to the existing long rod bolt body during the production process, when the combination of the long rod bolt body, the gasket, the primary protective tube and the secondary protective tube is connected to the automobile part, the overall structural size of the automobile part does not change, and it is only necessary to select the parts connected to the threaded rod accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the external structure of a long-rod bolt body of a scratch-resistant long-rod bolt structure for automobiles according to the present invention;

[0030] Figure 2 It is a cross-sectional view of a first-level protective tube, a protective rubber sleeve and a second-level protective tube of a long-rod bolt structure for an automobile that is scratch-resistant according to the present invention;

[0031] Figure 3 An exploded view of a first-level protective tube, a protective rubber sleeve and a second-level protective tube of a long-rod bolt structure for an automobile that is scratch-resistant according to the present invention;

[0032] Figure 4 The present invention is a scratch-resistant long-rod bolt structure for automobiles Figure 2 The enlarged schematic diagram of the middle A part;

[0033] Figure 5 The present invention is a scratch-resistant long-rod bolt structure for automobiles Figure 2 Enlarged schematic diagram of part B in the middle.

[0034] Figure numerals: 1. long rod bolt body; 101. threaded rod; 102. bolt head; 103. round rod; 2. gasket; 201. gasket ring; 202. gasket sleeve; 3. primary protective tube; 4. protective rubber sleeve; 5. secondary protective tube; 6. spring; 7. tube ring; 8. circular ring; 9. storage ring groove; 10. clearance groove. DETAILED DESCRIPTION

[0035] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0036] Embodiment 1:

[0037] This embodiment introduces a scratch-resistant long-rod bolt structure for automobiles. Figure 1-Figure 5 As shown, it includes a long rod bolt body 1, a primary protection tube 3, and a secondary protection tube 5. The long rod bolt body 1 includes a round rod 103, one end of the round rod 103 is integrally formed with a bolt head 102, and the other end of the round rod 103 is integrally formed with a threaded rod 101. A spring 6 is provided between one end of the primary protection tube 3 and the secondary protection tube 5, and the outer portion of the spring 6 is sleeved with a protective rubber sleeve 4;

[0038] Among them, by making the primary protection tube 3 and the secondary protection tube 5 both sleeved to the outside of the round rod 103, and making the spring 6 sleeved to the outside of the round rod 103, the primary protection tube 3 and the secondary protection tube 5 can form protection outside the round rod 103 and the threaded rod 101. When an external object tends to impact the long rod bolt body 1, the primary protection tube 3 and the secondary protection tube 5 cooperate with the spring 6 to block it, which can prevent the external object from scratching the surface of the long rod bolt body 1.

[0039] Secondly, in order to set up the spring 6, the inner side of the spring 6 is isolated from the surface of the round rod 103, as shown in FIG. Figure 3 As shown, one end of the primary protection tube 3 and the secondary protection tube 5 are both processed with a tube ring 7, and by making the two ends of the spring 6 respectively sleeved on the outside of the two tube rings 7, it can be avoided that the spring 6 directly contacts the surface of the round rod 103;

[0040] At the same time, the two end surfaces of the spring 6 are respectively welded to one end surface of the secondary protection tube 5 and one end surface of the primary protection tube 3, and the primary protection tube 3 and the secondary protection tube 5 can be connected and fixed by the spring 6;

[0041] Furthermore, in order to ensure that the protective rubber sleeve 4 forms a protection on the outside of the spring 6 to prevent the long rod bolt body 1 from being damaged when an external object impacts it, such as Figure 4 As shown, the surfaces of one end of the secondary protection tube 5 and the primary protection tube 3 are both processed with a receiving ring groove 9, and the inner wall of one side of the receiving ring groove 9 is processed with a circular ring 8. By extending the two ends of the protective rubber sleeve 4 into the receiving ring groove 9 on the secondary protection tube 5 and the receiving ring groove 9 on the primary protection tube 3, respectively, and tightening them to the outside of the circular ring 8, the spring 6 between the secondary protection tube 5 and the primary protection tube 3 can be covered;

[0042] At the same time, the protective rubber sleeve 4 is in a stretched state, and controls one end of the primary protective tube 3 and the secondary protective tube 5 to approach each other, compressing the spring 6. When the long rod bolt body 1 is installed on the car and the threaded rod 101 is connected to the target part, the primary protective tube 3 and the secondary protective tube 5 approach each other, compressing the spring 6, and the protective rubber sleeve 4 switches from a stretched state to a relaxed state, so that when the long rod bolt body 1 is in use, the protective rubber sleeve 4 can try its best to stay in a straight state.

[0043] Embodiment 2:

[0044] Based on Example 1, this example introduces a preparation process of a scratch-resistant long-rod bolt for automobiles, comprising:

[0045] S1: The steel wire is uncoiled and cut after being straightened to a fixed length;

[0046] S2: cold forging the steel into a shape similar to the long-stem bolt body 1 at room temperature;

[0047] S3: Pressing the prototype long-rod bolt body 1 into different pressing dies under high pressure to gradually form a semi-finished long-rod bolt body 1;

[0048] Compared with the long rod bolt body 1 in the prior art, the semi-finished long rod bolt body 1 has a smaller diameter, which provides conditions for the installation of the primary protection tube 3, the secondary protection tube 5 and the spring 6;

[0049] S4: Referring to the size of the round rod 103 on the semi-finished long rod bolt body 1, a primary protection tube 3 and a secondary protection tube 5 are formed, and a spring 6 is welded between the primary protection tube 3 and the secondary protection tube 5;

[0050] Among them, the gap between the surface of the round rod 103 on the long rod bolt body 1 and the inner wall of the primary protection tube 3 and the secondary protection tube 5 is 14 mm, and the diameter length of the primary protection tube 3 and the secondary protection tube 5 is the diameter length of the existing long rod bolt body 1. Through the matching tolerance of 14 mm, the mechanical matching precision size requirements are met. In the actual application process, the primary protection tube 3 and the secondary protection tube 5 can supplement the part of the round rod 103 that is reduced in size compared with the round rod 103 in the prior art, ensuring the structural strength of the long rod bolt body 1;

[0051] Secondly, a gasket 2 is formed on the outside of the round rod 103 in S4, and a clearance groove 10 is processed inside one end of the primary protection tube 3. The clearance groove 10 formed inside one end of the primary protection tube 3 refers to the outer diameter size of the gasket sleeve 202 on the gasket 2. By connecting the gasket 2 between one end of the primary protection tube 3 and one side of the bolt head 102, the gasket sleeve 202 can pass through the automobile component to eliminate the gap between the round rod 103 with a reduced diameter and the hole of the component;

[0052] The matching tolerance between the outer wall of the gasket sleeve 202 and the inner wall of the gap groove 10 is 25 mm. By inserting one end of the gasket sleeve 202 into the inner wall of the gap groove 10, the outer wall of the gasket sleeve 202 fits with the inner wall of the gap groove 10, so that the gasket member 2 can cooperate with the primary protection tube 3 and the secondary protection tube 5 to form protection outside the round rod 103;

[0053] S5: forming a threaded rod 101 at one end of the long rod bolt body 1 by rolling;

[0054] S6: placing the long rod bolt body 1, the primary protection tube 3, the secondary protection tube 5 and the gasket 2 in a high temperature environment to harden the steel;

[0055] A gasket 2 is sleeved on the outside of one end of the round rod 103 . The gasket 2 includes a gasket ring 201 . A gasket sleeve 202 is integrally formed on one side of the gasket ring 201 . The surface of one side of the gasket ring 201 fits with the surface of one side of the bolt head 102 .

[0056] Specifically, when the anti-scratch long-stem bolt for automobile is used to prepare a long-stem bolt:

[0057] First, referring to the general process of existing long-stem bolts, the steel wire is unwound, straightened and cut, and the steel is cold-forged at room temperature into a shape similar to the long-stem bolt body 1;

[0058] Then, the prototype long-rod bolt body 1 is pressed into different pressing dies whose size is smaller than the diameter of the target long-rod bolt body 1, and the semi-finished long-rod bolt body 1 is gradually formed;

[0059] Next, referring to the size of the semi-finished long rod bolt body 1, a primary protection tube 3, a gasket 2 and a secondary protection tube 5 that can be sleeved on the outside of the round rod 103 are formed, the gap groove 10 on the secondary protection tube 5 and the gasket sleeve 202 on the gasket 2 are formed in a complementary manner, and the primary protection tube 3 and the secondary protection tube 5 have the same outer diameter size, forming protection on the outside of the round rod 103 and the threaded rod 101;

[0060] Subsequently, a protective rubber sleeve 4 is sleeved on the outside of the spring 6, so that the two ends of the spring 6 are respectively sleeved on the outside of the tube ring 7 on the primary protective tube 3 and the tube ring 7 on the secondary protective tube 5, and are connected and fixed to the primary protective tube 3 and the secondary protective tube 5 by welding. The two ends of the protective rubber sleeve 4 are respectively extended into the receiving ring groove 9 on the secondary protective tube 5 and the receiving ring groove 9 on the primary protective tube 3, and are tightened to the outside of the circular ring 8, so as to cover the spring 6.

[0061] At the same time, when using the anti-scratch automotive long-stem bolt for work:

[0062] First, the gasket 2 is sleeved onto the outside of the round rod 103 through the threaded rod 101, so that the surface of one side of the gasket ring 201 fits with the surface of the bolt head 102, and the primary protection tube 3, the spring 6 and the secondary protection tube 5 are sleeved onto the outside of the round rod 103 in sequence, so that one end of the gasket sleeve 202 extends into the gap groove 10 at one end of the primary protection tube 3;

[0063] Then, the long rod bolt body 1 is installed on the automobile, and the gasket sleeve 202 passes through the automobile component to eliminate the gap between the round rod 103 with a smaller diameter and the hole of the component. When the threaded rod 101 is connected to the target part, because the primary protective tube 3 and the secondary protective tube 5 are supported on the inner side of the component, when the long rod bolt body 1 is tightened, the primary protective tube 3 and the secondary protective tube 5 are pressed close to each other, compressing the spring 6, and the protective rubber sleeve 4 switches from a stretched state to a relaxed state, so that the protective rubber sleeve 4 tries to keep the straight state. At this time, the secondary protective tube 5 forms protection on the outside of the threaded rod 101 and the round rod 103, and the spring 6 cooperates with the protective rubber sleeve 4 and the primary protective tube 3 to form protection on the outside of the round rod 103. No matter whether the long rod bolt body 1 is subjected to axial impact or shear force, the surface of the long rod bolt body 1 can be prevented from being scratched by the sliding and rotating of the primary protective tube 3 and the secondary protective tube 5 on the outside of the round rod 103.

[0064] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A scratch-resistant long-rod bolt structure for automobiles, characterized in that: include: Long-stem bolt body (1); Primary protection tube (3); Secondary protection tube (5); The long-rod bolt body (1) comprises a round rod (103), one end of the round rod (103) is integrally formed with a bolt head (102), the other end of the round rod (103) is integrally formed with a threaded rod (101), and the primary protection tube (3) and the secondary protection tube (5) are both sleeved onto the outside of the round rod (103); A spring (6) is provided between one end of the primary protection tube (3) and the secondary protection tube (5), the outside of the spring (6) is sleeved with a protective rubber sleeve (4), and the spring (6) is sleeved on the outside of the round rod (103).

2. The scratch-resistant long-rod bolt structure for automobiles according to claim 1, characterized in that: One end of each of the primary protection tube (3) and the secondary protection tube (5) is processed with a tube ring (7); The two ends of the spring (6) are respectively sleeved on the outside of the two pipe rings (7), and the two end surfaces of the spring (6) are respectively welded and fixed to one end surface of the secondary protection tube (5) and one end surface of the primary protection tube (3).

3. The scratch-resistant long-rod bolt structure for automobiles according to claim 1, characterized in that: One end surface of the secondary protection tube (5) and the primary protection tube (3) are both processed with a receiving ring groove (9), and the inner wall of one side of the receiving ring groove (9) is processed with a circular ring (8); Wherein, the two ends of the protective rubber sleeve (4) extend into the receiving ring groove (9) on the secondary protective tube (5) and the receiving ring groove (9) on the primary protective tube (3) respectively, and are clamped on the outside of the circular ring (8).

4. The scratch-resistant long-rod bolt structure for automobiles according to claim 1, characterized in that: A gasket member (2) is sleeved on the outside of one end of the round rod (103), wherein the gasket member (2) comprises a gasket ring (201), and a gasket sleeve (202) is integrally formed on one side of the gasket ring (201); Wherein, a surface on one side of the gasket ring (201) is in contact with a surface on one side of the bolt head (102).

5. The scratch-resistant long-rod bolt structure for automobiles as claimed in claim 4, characterized in that: A clearance groove (10) is machined inside one end of the primary protection tube (3), one end of the gasket sleeve (202) is inserted into the interior of the clearance groove (10), and the outer wall of the gasket sleeve (202) fits the inner wall of the clearance groove (10).

6. The scratch-resistant long-rod bolt structure for automobiles according to claim 1, characterized in that: The protective rubber sleeve (4) is in a stretched state, and controls one end of the primary protective tube (3) and the secondary protective tube (5) to approach each other, thereby compressing the spring (6).

7. A process for preparing a scratch-resistant long-stem bolt for automobiles, which is used to prepare the long-stem bolt structure according to any one of claims 1 to 6, characterized in that: include; S1: The steel wire is uncoiled and cut after being straightened to a fixed length; S2: Cold forging the steel into a shape similar to the long-shank bolt body (1) at room temperature; S3: Pressing the prototype long-rod bolt body (1) into different pressing dies under high pressure to gradually form a semi-finished long-rod bolt body (1); S4: Referring to the size of the round rod (103) on the semi-finished long rod bolt body (1), a primary protection tube (3) and a secondary protection tube (5) are formed, and a spring (6) is welded between the primary protection tube (3) and the secondary protection tube (5); S5: forming a threaded rod (101) at one end of the long rod bolt body (1) by rolling; S6: Place the long-stem bolt body (1), the primary protection tube (3), the secondary protection tube (5) and the gasket (2) in a high-temperature environment to harden the steel.

8. The process for preparing a scratch-resistant long-stem bolt for automobiles according to claim 7, characterized in that: The gap between the surface of the round rod (103) on the long rod bolt body (1) and the inner walls of the primary protection tube (3) and the secondary protection tube (5) is fourteen millimeters, and the diameter length of the primary protection tube (3) and the secondary protection tube (5) is the same as the diameter length of the existing long rod bolt body (1).

9. The process for preparing a scratch-resistant long-stem bolt for automobiles according to claim 7, characterized in that: A gasket (2) is also formed on the outside of the round rod (103) in S4, and a gap groove (10) formed inside one end of the primary protective tube (3) is based on the outer diameter of the gasket sleeve (202) on the gasket (2), and the matching tolerance between the outer wall of the gasket sleeve (202) and the inner wall of the gap groove (10) is 25 mm.

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