CN108547855B

CN108547855B - Screw thread pressure riveting anti-rotation structure and use method thereof

Info

Publication number: CN108547855B
Application number: CN201810379735.8A
Authority: CN
Inventors: 钱中亮; 陈恩华; 黄美清; 龙海源
Original assignee: Chongqing Caff Automotive Braking and Steering Systems Co Ltd
Current assignee: Chongqing Caff Automotive Braking and Steering Systems Co Ltd
Priority date: 2018-04-25
Filing date: 2018-04-25
Publication date: 2020-04-21
Anticipated expiration: 2038-04-25
Also published as: CN108547855A

Abstract

The invention belongs to the technical field of thread rotation prevention, and particularly discloses a thread press riveting rotation prevention structure which comprises a riveting toothed hole positioned at the outer edge of an inner hole on a ball seat and a cylindrical part which is in clearance fit with the riveting toothed hole on a plug screw, wherein the riveting toothed hole and the inner hole are coaxially arranged, the inner diameter of the riveting toothed hole is larger than that of the thread of the inner hole, and the diameter of the cylindrical part is smaller than that of the plug screw; a plurality of riveting teeth are pressed into the gap between the riveting tooth hole and the cylindrical part, the plurality of riveting teeth are uniformly distributed on the circumference where the riveting tooth hole is located, and the width of each riveting tooth is larger than the gap between the riveting tooth hole and the cylindrical part. Compared with the prior art, the ball head pin assembly has the advantages of simple structure and convenience in use, and can effectively prevent the rotation of the threaded connection part in the ball head pin assembly under the condition of not damaging the threads.

Description

Screw thread pressure riveting anti-rotation structure and use method thereof

Technical Field

The invention belongs to the technical field of screw thread rotation prevention, and particularly discloses a screw thread press riveting rotation prevention structure and a use method thereof.

Background

The threaded connection is a detachable fixed connection which is widely used, has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like, and is widely applied to mechanical connection. The thread is a key structure of threaded connection, and can be divided into triangular, rectangular, trapezoidal, zigzag threads and the like according to the shape of a plane figure. According to the winding direction of the spiral line, the spiral line can be divided into a left-handed thread and a right-handed thread, and the spiral line is regulated to be lifted to the right as the right-handed thread and to be lifted to the left as the left-handed thread when the thread is upright. In the mechanical manufacture, right-handed screw threads are generally adopted, and left-handed screw threads are adopted only when special requirements are met. Depending on the number of spirals, a single thread and a plurality of equally spaced threads can be distinguished. For ease of manufacture, the threads typically do not exceed 4 lines.

Although the threaded connection is very convenient, under the action of impact, vibration or variable load and at high temperature or large temperature change, the friction force between the threads can be instantly reduced or disappeared, two connecting pieces of the threaded connection can rotate relatively to be loosened, and potential safety hazards exist. The rotation prevention of the screw thread is always an industrial problem, particularly a large screw thread; at present, the flange plate is added, the inclination angle of the thread is changed, but the defects of unstable locking prevention, high manufacturing and maintenance cost and the like exist, and the flange plate is not suitable for preventing the rotation of the large thread.

In the automobile suspension system, the ball pin bears main stress, so the structure of the ball pin must keep stable state in the using process; therefore, the related ball pin assembly is designed according to the use requirement of high mobility of the automobile suspension. The ball head pin assembly mainly comprises a ball seat for mounting the ball pin and a plug screw for fixing the position of the ball pin in the ball seat, wherein an inner hole is formed in the ball seat and used for mounting the ball pin, and a part of the inner hole is provided with threads and used for mounting the plug screw. In the use process of the ball head pin assembly, the ball pin is stressed to impact, vibrate and the like with the ball seat, so that the threaded connection between the plug screw and the ball seat is easy to loosen. At present, the rotation prevention capability is achieved by increasing the flange surface or changing the thread inclination angle in the industry, the flange surface is used for increasing the contact area and increasing the friction force, and the thread inclination angle is used for changing the thread stress to achieve self-locking. A large number of experiments prove that the two methods are not suitable for large-thread connection, particularly suspension ball pin type high-mobility connection, and finally the bench is durable and road experiments prove that the technical problem can be thoroughly solved by riveting and rotation prevention.

Disclosure of Invention

The invention aims to provide a thread press-riveting anti-rotation structure and a use method thereof, and aims to solve the problem that the use of a ball head pin assembly is influenced because the ball seat and a plug screw are easy to relatively rotate at the threaded connection part of the ball seat and the plug screw.

In order to achieve the purpose, the basic scheme of the invention is as follows: the thread press-riveting anti-rotation structure comprises a riveting toothed hole positioned at the outer edge of an inner hole on a ball seat and a cylindrical part which is in clearance fit with the riveting toothed hole on a plug screw, wherein the riveting toothed hole and the inner hole are coaxially arranged, the inner diameter of the riveting toothed hole is larger than that of the thread of the inner hole, and the diameter of the cylindrical part is smaller than that of the plug screw; a plurality of riveting teeth are pressed into the gap between the riveting tooth hole and the cylindrical part, the plurality of riveting teeth are uniformly distributed on the circumference where the riveting tooth hole is located, and the width of each riveting tooth is larger than the gap between the riveting tooth hole and the cylindrical part.

The working principle of the basic scheme is as follows: this structure is applicable to in the bulb round pin assembly, when the bulb round pin assembly was assembled, the plug screw after ball seat and threaded connection with it of packing into, rivet the tooth hole will with the cooperation of cylinder portion and exist the clearance, select the riveting tooth of suitable quantity according to the specification of screw thread this moment to in will riveting the tooth pressure through the press and riveting the clearance between tooth hole and the cylinder portion. Because the width of the riveting teeth is larger than the gap between the riveting tooth hole and the cylindrical part, the riveting teeth can physically deform the plug screw and the ball seat under the pressure action of the press machine, so that the plug screw and the ball seat can not move relatively, and the threaded connection part of the plug screw and the ball seat can not rotate. Because the clearance of riveting between tooth hole and the cylinder portion is the ring shape, rivet the tooth through the pressure effect is impressed here, can further make plug screw and ball seat can not take place relative rotation to the threaded connection department of further preventing plug screw and ball seat takes place to rotate. This structure prevents changeing for modes such as increase ring flange, change screw thread inclination to threaded connection, and its structure is simpler, also is fit for mass production, prevents changeing intensity simultaneously and can injectd through the quantity of riveting the tooth and pressing the rivet to make this structure be suitable for the threaded connection department of multiple specification.

The anti-rotation limiting structure has the advantages that the anti-rotation limiting structure is used for limiting the threaded connection position of the ball head pin assembly, when the threaded connection position of the ball seat and the plug screw needs to be disassembled, riveting teeth can be cut out by a machine tool, so that the anti-rotation limiting structure for the threaded connection position of the ball head pin assembly is eliminated, and the plug screw can be disassembled from the ball seat. When the screw plug is in threaded connection with the ball seat again and then the threaded connection part needs to be prevented from rotating, the rivet teeth can be pressed in again at other positions of the gap.

The beneficial effect of this basic scheme lies in: this structure is comparatively simple, convenient operation, and the rotation-proof effect intensity to ball head round pin assembly threaded connection department is great, can effectually prevent plug screw and ball seat threaded connection department relative rotation. Because of the ingenious ability of enabling of unique concave station design screw thread not destroyed when the pressure is riveted to rivet the tooth and can get rid of using, and can reuse, very make things convenient for ball head pin assembly to maintain in the use. The structure is small, and the use of the ball stud assembly cannot be interfered when the ball stud assembly is used. Compared with the prior art, the ball head pin assembly has the advantages of simple structure and convenience in use, and can effectively prevent the rotation of the threaded connection part in the ball head pin assembly.

The first preferred scheme is as follows: preferably, the cross section of the rivet teeth is rectangular, and the width of the rivet teeth is 5-10 mm. Because the clearance of riveting the perforation and cylinder portion is the ring shape, the cross section of riveting the tooth can have more contact surface for the rectangle with riveting perforation and cylinder portion to when making to rivet the tooth and pressing into the clearance, it is great to plug screw and ball seat material resources effect, further makes the screw of this structure prevent changeing intensity bigger.

The preferred scheme II is as follows: preferably, the cross section of the rivet tooth is a rectangle with the length 2-5 times of the width. Further increase the area of contact of riveting tooth and plug screw, ball seat material resources to make the screw of this structure prevent changeing intensity bigger.

The preferable scheme is three: preferably, the number of the rivet teeth is 2 to 10 as a basis, a first preferred embodiment, or a second preferred embodiment. 2-10 rivet teeth are adopted according to the specification of the thread, so that the anti-rotation strength of the threaded connection part is met.

The preferable scheme is four: preferably, the number of the rivet teeth is 4-8. As more threads with medium specifications are used for threaded connection of the ball stud assembly, 4-8 riveting teeth are more selected to perform anti-rotation treatment on the threaded connection part in the specific production and manufacturing process.

The invention also provides a use method of the screw thread pressure riveting anti-rotation structure, which comprises the following steps:

(1) the ball pin is arranged in an inner hole of the ball seat, and is in threaded connection with the threaded section of the inner hole of the ball seat by using a screw plug which is in threaded connection with the seat body;

(2 tightening the screw plug, aligning the cylindrical part of the screw plug with the riveting tooth hole of the ball seat, and cleaning the gap between the riveting tooth hole and the cylindrical part;

(3) determining the number of the needed riveting teeth according to the specification of the threads, fixing the riveting teeth on a press according to the needed pressing positions of the riveting teeth, and pressing the riveting teeth into a gap between a riveting tooth hole and the cylindrical part by using the press;

(4) when the plug screw needs to be detached from the ball seat, the riveting teeth are cut off by a machine tool, and the plug screw can be taken out from the ball seat by rotating the plug screw along the thread of the inner hole;

(5) when the threaded connection part of the screw plug and the ball seat needs to be fixed again for preventing rotation, the steps (1), (2) and (3) can be repeated in sequence, and the riveting teeth are pressed into gaps at other positions between the riveting tooth hole and the cylindrical part again.

By the use method, the thread anti-rotation structure can be quickly assembled on the ball stud assembly, and the assembly position is more suitable, so that the anti-rotation strength of the thread anti-rotation structure is further enhanced, and the threaded connection part of the ball stud assembly cannot rotate.

Drawings

FIG. 1 is a cross-sectional view of a ball stud assembly using the screw clinch anti-rotation structure of the present invention;

fig. 2 is a bottom view of fig. 1.

Detailed Description

The present invention will be described in further detail below by way of specific embodiments:

reference numerals in the drawings of the specification include: the ball pin 10, the screw plug 20, the cylindrical part 21, the ball seat 30, the inner hole 31, the riveting tooth hole 32, the gap 40 and the riveting tooth 41.

As shown in fig. 1 and 2, the screw pressing rivet rotation prevention structure includes a rivet tooth hole 32 located at the outer edge of an inner hole 31 on a ball seat 30 and a cylindrical portion 21 in clearance fit with the rivet tooth hole 32 on a plug screw 20, the rivet tooth hole 32 and the inner hole 31 are coaxially arranged, the inner diameter of the rivet tooth hole 32 is larger than the inner diameter of the screw thread of the inner hole 31, and the diameter of the cylindrical portion 21 is smaller than the diameter of the plug screw 20; the riveting teeth 41 are pressed into the gap 40 between the riveting tooth hole 32 and the cylindrical part 21, the riveting teeth 41 are uniformly distributed on the circumference where the riveting tooth hole 32 is located, and the width of the riveting teeth 41 is larger than the gap 40 between the riveting tooth hole 32 and the cylindrical part 21. The cross section of the riveting tooth 41 is rectangular, and the width of the riveting tooth 41 is 5-10 mm; the cross-section of the rivet teeth 41 is rectangular with a length 2-5 times the width, preferably 3 times in this embodiment. The number of the riveting teeth 41 is 2-10, and preferably 6 in the embodiment.

This structure is applicable to in the ball stud assembly, and when the ball stud assembly was assembled, the plug screw 20 was installed ball seat 30 and threaded connection with it after, riveting tooth hole 32 will cooperate with cylindric portion 21 and exist clearance 40, and the riveting tooth 41 of suitable quantity is selected according to the specification of screw thread this moment to in the clearance 40 between riveting tooth hole 32 and cylindric portion 21 is impressed the riveting tooth 41 through the press. Because the width of the rivet teeth 41 is greater than the gap 40 between the rivet teeth 32 and the cylindrical portion 21, the rivet teeth 41 will physically deform both the plug 20 and the ball seat 30 under the pressure of the press, so that the plug 20 and the ball seat 30 will not move relatively, and the threaded connection between the plug 20 and the ball seat 30 will not rotate. Since the gap 40 between the rivet hole 32 and the cylindrical portion 21 is formed in a circular ring shape, the rivet teeth 41 are pressed in by pressure, so that the screw plug 20 and the ball seat 30 are further prevented from rotating relatively, and the screw connection between the screw plug 20 and the ball seat 30 is further prevented from rotating. This structure prevents changeing for modes such as increase ring flange, change screw thread inclination to threaded connection, and its structure is simpler, also is fit for mass production, prevents changeing intensity simultaneously and can prescribe a limit to through the quantity of riveting tooth 41 with pressing the rivet to make this structure be suitable for the threaded connection department of multiple specification.

The anti-rotation limit is performed on the threaded connection part of the ball stud assembly through the structure, when the threaded connection part of the ball seat 30 and the plug screw 20 needs to be disassembled, the rivet teeth 41 can be cut out by a machine tool, so that the anti-rotation limit on the threaded connection part of the ball stud assembly through the structure is removed, and the plug screw 20 can be disassembled from the ball seat 30. When it is necessary to prevent the screw joint from rotating after the screw plug 20 is screwed again with the ball seat 30, the rivet teeth 41 may be pressed again at other positions of the gap 40.

(1) the ball pin 10 is arranged in an inner hole 31 of the ball seat 30, the threaded section of the inner hole 31 of the ball seat 30 is in threaded connection with the plug screw 20, and the plug screw 20 is in threaded connection with the seat body;

(2 tightening the screw plug 20, aligning the cylindrical portion 21 of the screw plug 20 with the rivet hole 32 of the ball seat 30, and cleaning the gap 40 between the rivet hole 32 and the cylindrical portion 21;

(3) determining the number of the needed riveting teeth 41 according to the specification of the thread, fixing the riveting teeth 41 on a press according to the needed pressing position, and pressing the riveting teeth 41 into the gap between the riveting tooth hole 32 and the cylindrical part 21 by using the press;

(4) when the plug screw 20 needs to be detached from the ball seat 30, the rivet teeth 41 are cut off by a machine tool, and the plug screw 20 can be taken out from the ball seat 30 by rotating the plug screw 20 along the thread of the inner hole 31;

(5) when the threaded connection between the plug screw 20 and the ball seat 30 needs to be fixed again to prevent rotation, the steps (1), (2) and (3) can be repeated in sequence, and the rivet teeth 41 can be pressed into the gaps between the rivet tooth hole 32 and the cylindrical portion 21 at other positions again.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims

1. The screw thread pressure riveting anti-rotation structure is characterized by comprising a riveting toothed hole positioned at the outer edge of an inner hole on a ball seat and a cylindrical part which is in clearance fit with the riveting toothed hole on a screw plug, wherein the riveting toothed hole and the inner hole are coaxially arranged, the inner diameter of the riveting toothed hole is larger than that of the screw thread of the inner hole, and the diameter of the cylindrical part is smaller than that of the screw plug; a plurality of riveting teeth are pressed in the gap between the riveting tooth hole and the cylindrical part, the plurality of riveting teeth are uniformly distributed on the circumference where the riveting tooth hole is located, and the width of each riveting tooth is larger than the gap between the riveting tooth hole and the cylindrical part; the cross section of each riveting tooth is rectangular, and the width of each riveting tooth is 5-10 mm; the cross section of the rivet tooth is a rectangle with the length 2-5 times of the width.

2. The screw-thread clinch anti-rotation structure of claim 1, wherein the number of the clinch teeth is 2 to 10.

3. The screw-thread clinch anti-rotation structure of claim 2, wherein the number of the clinch teeth is 4 to 8.

4. The use method of the screw thread clinch anti-rotation structure according to claim 3, comprising the steps of: