阅读说明：本技术 防止做松动方向自动滚动运动的螺纹副 (Thread pair capable of preventing automatic rolling motion in loosening direction ) 是由 许松林 于 2021-02-23 设计创作，主要内容包括：本发明公开了一种防止做松动方向自动滚动运动的螺纹副,包括螺栓、第一螺母及第二螺母,所述第二螺母的内螺纹大径小于所述螺栓的外螺纹大径,或所述第二螺母的内螺纹小径小于所述螺栓的外螺纹小径,所述螺栓、第一螺母及第二螺母在工件上安装拧紧后,所述第一螺母的底部与所述工件接触,所述第二螺母的底部与所述第一螺母的顶部接触,所述第二螺母的内螺纹牙底与所述螺栓的外螺纹牙顶之间是相互横向锁定的接触结构,或所述第二螺母的内螺纹牙顶与所述螺栓的外螺纹牙底之间是相互横向锁定的接触结构,从而,在横向振动或冲击的时候能有效防止所述第一螺母、第二螺母与所述螺栓之间连续地做松动方向滚动运动。(The invention discloses a thread pair capable of preventing automatic rolling motion in a loosening direction, which comprises a bolt, a first nut and a second nut, wherein the major diameter of an internal thread of the second nut is smaller than the major diameter of an external thread of the bolt, or the minor diameter of the internal thread of the second nut is smaller than the minor diameter of the external thread of the bolt, after the bolt, the first nut and the second nut are installed and screwed on a workpiece, the bottom of the first nut is contacted with the workpiece, the bottom of the second nut is contacted with the top of the first nut, a contact structure for mutually transversely locking an internal thread crest of the second nut and an external thread crest of the bolt is adopted, or a contact structure for mutually transversely locking an internal thread crest of the second nut and an external thread crest of the bolt is adopted, so that the first nut can be effectively prevented from transversely vibrating or impacting, And the second nut and the bolt continuously perform rolling motion in the loosening direction.)

1. The screw thread pair for preventing the automatic rolling movement in the loosening direction comprises a bolt, a first nut and a second nut, and is characterized in that: the large diameter of the internal thread of the second nut is smaller than the large diameter of the external thread of the bolt, after the bolt, the first nut and the second nut are installed and screwed on a workpiece, the bottom of the first nut is in contact with the workpiece, the bottom of the second nut is in contact with the top of the first nut, a contact structure which is mutually and transversely locked is formed between the tooth bottom of the internal thread of the second nut and the tooth top of the external thread of the bolt, a longitudinal gap is formed between the external thread of the bolt and the internal thread of the first nut, the large diameter of the internal thread of the first nut is larger than the large diameter of the external thread of the bolt, the small diameter of the internal thread of the first nut is larger than the small diameter of the external thread of the bolt, and the contact part of the tooth bottom of the internal thread and the tooth top of the external thread is made of materials other than.

2. The screw thread pair for preventing the automatic rolling movement in the loosening direction comprises a bolt, a first nut and a second nut, and is characterized in that: the small diameter of the inner thread of the second nut is smaller than the small diameter of the outer thread of the bolt, after the bolt, the first nut and the second nut are installed and screwed on a workpiece, the bottom of the first nut is in contact with the workpiece, the bottom of the second nut is in contact with the top of the first nut, a contact structure for mutual transverse locking is formed between the crest of the inner thread of the second nut and the root of the outer thread of the bolt, a longitudinal gap is formed between the outer thread of the bolt and the inner thread of the first nut, the large diameter of the inner thread of the first nut is larger than the large diameter of the outer thread of the bolt, the small diameter of the inner thread of the first nut is larger than the small diameter of the outer thread of the bolt, and the contact part of the crest of the inner thread and the root of the outer thread is made of materials other than nylon, rubber and.

3. The thread pair for preventing automatic rolling motion in loosening direction according to claim 1, wherein: the bolt and the second nut are metal material fasteners.

4. The thread pair for preventing automatic rolling motion in loosening direction according to claim 1, wherein: the first nut is a standard thin nut.

5. The thread pair for preventing automatic rolling motion in loosening direction according to claim 2, wherein: the bolt and the second nut are metal material fasteners.

6. The thread pair for preventing automatic rolling motion in loosening direction according to claim 2, wherein: the first nut is a standard thin nut.

Technical Field

The invention relates to the field of fasteners, in particular to a thread pair capable of preventing automatic rolling motion in a loosening direction.

Background

In addition, the internal screw member and the external screw member are automatically rotated in a relative loosening direction in two modes, namely, a sliding motion (for example, the internal screw member slides and rotates in a relative loosening direction under the action of rotational inertia) and a rolling motion (transverse rotation without a fixed shaft).

In the published article, "new cylindrical thread connection anti-loosening principle and anti-loosening technology" (new Chinese technical product, 2015.10 (above) ") by the inventor, theoretical analysis and experimental results prove that" the loosening generated in the environment of transverse vibration or impact by cylindrical thread connection is the transverse rotation movement (rolling movement) without a fixed shaft between the internal and external thread pieces, so that the transverse rotation movement without a fixed shaft between the internal and external thread pieces can be prevented as long as the transverse locking between the internal and external thread pieces is realized, namely the complete anti-loosening of the cylindrical thread connection in the environment of transverse vibration or impact can be realized.

The rolling movement in the loosening direction between the internal thread element and the external thread element is required to have a space capable of performing the rolling movement in the loosening direction.

The technical scheme of 'double-nut threaded connection for preventing automatic rolling movement in loosening direction' with the publication number of CN208252561U designed by the inventor has the following defects: meanwhile, a structure that the upper thread side of the internal thread of the second nut is in contact with the lower thread side of the external thread of the bolt and a structure that the lower thread side of the internal thread of the first nut is in contact with the upper thread side of the external thread of the bolt can be realized, so that the first nut and the bolt can be effectively prevented from continuously performing rolling motion in the loosening direction in the transverse vibration or impact process, namely, the axial force received by the top of the first nut is greater than the initial clamping force, so that the first nut and the bolt can be effectively prevented from continuously performing rolling motion in the loosening direction in the transverse vibration or impact process, and therefore, the clamping force on a workpiece is difficult to control when the technical scheme is implemented.

Disclosure of Invention

The invention aims to provide a thread pair which can effectively prevent the first nut, the second nut and a bolt from continuously performing rolling motion in the loosening direction during transverse vibration or impact, and further, the technical problem to be solved by the invention is as follows: 1. the technical effect that the rolling motion in the loosening direction between the second nut and the bolt can be effectively prevented when the second nut and the bolt are vibrated or impacted transversely, so that the rolling motion in the loosening direction between the first nut and the bolt can be effectively prevented is achieved; 2. the technical scheme of the double-nut threaded connection for preventing the automatic rolling motion in the loosening direction has the advantages of overcoming the defects.

In order to solve the technical problems, the invention adopts the technical scheme that:

the technical scheme 1: the thread pair for preventing automatic rolling motion in the loosening direction comprises a bolt, a first nut and a second nut, wherein the major diameter of an internal thread of the second nut is smaller than the major diameter of an external thread of the bolt, after the bolt, the first nut and the second nut are installed and screwed on a workpiece, the bottom of the first nut is in contact with the workpiece, the bottom of the second nut is in contact with the top of the first nut, a contact structure for mutually and transversely locking an internal thread root of the second nut and an external thread crest of the bolt is formed between the internal thread root of the second nut and the external thread crest of the bolt, a longitudinal gap is formed between the external thread of the bolt and the internal thread of the first nut, the major diameter of the internal thread of the first nut is larger than the major diameter of the external thread of the bolt, the minor diameter of the internal thread of the first nut is larger than the minor diameter of the external thread of the bolt, and the contact part of the internal thread, Rubber and synthetic resins.

After the bolt and the first nut and the second nut are mounted and screwed on the workpiece (refer to fig. 1 and fig. 2), no space is left between the second nut and the first nut, and the first nut can continuously roll in the loosening direction, and a contact structure is formed between the thread bottom of the internal thread of the second nut and the thread top of the external thread of the bolt, so that the second nut and the bolt cannot continuously roll in the loosening direction during transverse vibration or impact, and therefore the first nut cannot continuously roll on the bolt along with the second nut in the loosening direction during transverse vibration or impact, that is, the first nut and the bolt cannot continuously roll in the loosening direction during transverse vibration or impact.

And after the bolt and the first nut are installed and screwed on the workpiece, an initial clamping force is generated. When the second nut is tightened, the bolt is stretched while the top of the first nut is subjected to an axial force exerted by the second nut, the magnitude of which is proportional to the length of the bolt that is stretched. As the bolt is stretched, the axial force applied by the external thread of the bolt to the internal thread of the first nut is correspondingly reduced, also by an amount proportional to the length of the bolt stretched. Thus, the clamping force experienced by the workpiece does not change as long as the top portion of the first nut is subjected to an axial force that is not greater than the initial clamping force.

After the bolt, the first nut and the second nut are installed and tightened on the workpiece, the internal thread of the first nut is generally subjected to an axial force smaller than a clamping force applied to the workpiece. Therefore, in order to reduce the weight and cost of the thread pair for preventing the loosening-direction automatic rolling motion, it is preferable that the first nut is a standard thin nut.

In the case of transverse vibration or impact, if there is no longitudinal gap between the external thread and the internal thread, or the major diameter of the internal thread is not greater than the major diameter of the external thread, or the minor diameter of the internal thread is not greater than the minor diameter of the external thread, then there will be a situation that the rolling movement in the loosening direction cannot be performed between the internal thread and the external thread because there is no space between the external thread and the internal thread, and the rolling movement in the loosening direction cannot be performed between the internal thread and the external thread.

If the material of the portion where the internal thread root and the external thread crest contact each other is nylon, rubber or synthetic resin, when the lateral inertial force of the second nut relative to the bolt is greater than a certain value during lateral vibration or impact, the nylon, rubber or synthetic resin material will generate continuous elastic deformation, which will result in a space between the internal thread root and the external thread crest for enabling the second nut and the bolt to continuously perform rolling motion in the loosening direction, and therefore, the "material of the portion where the internal thread root and the external thread crest contact each other is not nylon, rubber or synthetic resin" is a necessary condition for the thread pair for preventing automatic rolling motion in the loosening direction.

In order to enhance the effect of preventing the loosening-direction automatic rolling movement, it is preferable that the bolt and the second nut are a metallic material fastener.

The technical scheme 2 is as follows: the thread pair capable of preventing automatic rolling movement in the loosening direction comprises a bolt, a first nut and a second nut, wherein the small diameter of an internal thread of the second nut is smaller than the small diameter of an external thread of the bolt, after the bolt, the first nut and the second nut are installed and screwed on a workpiece, the bottom of the first nut is in contact with the workpiece, the bottom of the second nut is in contact with the top of the first nut, a contact structure capable of locking the internal thread crest of the second nut and the external thread root of the bolt in a transverse mode is formed between the internal thread crest of the second nut and the external thread root of the bolt, a longitudinal gap is formed between the external thread of the bolt and the internal thread of the first nut, the large diameter of the internal thread of the first nut is larger than the large diameter of the external thread of the bolt, the small diameter of the internal thread of the first nut is larger than the small diameter of the external thread of the bolt, and the contact, Rubber and synthetic resins.

After the bolt and the first nut and the second nut are mounted and screwed on the workpiece (refer to fig. 3 and 4), no space is left between the second nut and the first nut, and the first nut can continuously perform rolling motion in the loosening direction, and a contact structure which is mutually transversely locked is formed between the crest of the internal thread of the second nut and the crest of the external thread of the bolt, so that the second nut and the bolt cannot continuously perform rolling motion in the loosening direction during transverse vibration or impact, and therefore the first nut cannot carry the second nut to continuously perform rolling motion in the loosening direction on the bolt during transverse vibration or impact, that is, the first nut and the bolt cannot continuously perform rolling motion in the loosening direction during transverse vibration or impact.

And after the bolt and the first nut are installed and screwed on the workpiece, an initial clamping force is generated. When the second nut is tightened, the bolt is stretched while the top of the first nut is subjected to an axial force exerted by the second nut, the magnitude of which is proportional to the length of the bolt that is stretched. As the bolt is stretched, the axial force applied by the external thread of the bolt to the internal thread of the first nut is correspondingly reduced, also by an amount proportional to the length of the bolt stretched. Thus, the clamping force experienced by the workpiece does not change as long as the top portion of the first nut is subjected to an axial force that is not greater than the initial clamping force.

After the bolt, the first nut and the second nut are installed and tightened on the workpiece, the internal thread of the first nut is generally subjected to an axial force smaller than a clamping force applied to the workpiece. Therefore, in order to reduce the weight and cost of the thread pair for preventing the loosening-direction automatic rolling motion, it is preferable that the first nut is a standard thin nut.

In the case of transverse vibration or impact, if there is no longitudinal gap between the external thread and the internal thread, or the major diameter of the internal thread is not greater than the major diameter of the external thread, or the minor diameter of the internal thread is not greater than the minor diameter of the external thread, then there will be a situation that the rolling movement in the loosening direction cannot be performed between the internal thread and the external thread because there is no space between the external thread and the internal thread, and the rolling movement in the loosening direction cannot be performed between the internal thread and the external thread.

If the material of the portion where the internal thread crest and the external thread root contact each other is nylon, rubber or synthetic resin, when the lateral inertial force of the second nut relative to the bolt is greater than a certain value during lateral vibration or impact, the nylon material, the rubber material or the synthetic resin material will generate continuous elastic deformation, so that a space capable of enabling the second nut and the bolt to continuously perform a rolling motion in a loosening direction is generated between the internal thread crest and the external thread root, and therefore, the condition that the material of the portion where the internal thread crest and the external thread root contact each other is not nylon, rubber or synthetic resin is the necessary condition for the thread pair preventing the automatic rolling motion in the loosening direction.

In order to enhance the effect of preventing the loosening-direction automatic rolling movement, it is preferable that the bolt and the second nut are a metallic material fastener.

In the present invention, the "transverse direction" is the same as the radial direction of the thread.

In the present invention, the "longitudinal direction" is the same as the axial direction of the thread.

In the present invention, the phrase "a longitudinal gap is formed between the external thread of the bolt and the internal thread of the first nut" means that a space in which the bolt and the first nut can perform a longitudinal linear motion is formed between the external thread of the bolt and the internal thread of the first nut.

The invention has the beneficial effects that: the thread pair capable of preventing the automatic rolling motion in the loosening direction can effectively prevent the rolling motion in the loosening direction between the second nut and the bolt when the thread pair vibrates or impacts transversely, so that the rolling motion in the loosening direction between the first nut and the bolt can be effectively prevented; the lower thread side of the internal thread of the first nut and the upper thread side of the external thread of the bolt are not in contact with each other, so that the first nut, the second nut and the bolt can be effectively prevented from continuously performing rolling motion in the loosening direction in the process of transverse vibration or impact, namely, the top of the first nut is not more than the initial clamping force, and the first nut, the second nut and the bolt can be effectively prevented from continuously performing rolling motion in the loosening direction in the process of transverse vibration or impact; as long as the top of the first nut is subjected to an axial force not greater than the initial clamping force, the clamping force on the workpiece will not change, and therefore, the clamping force on the workpiece is easily controlled when implementing this solution.

Drawings

FIG. 1 is a schematic diagram of a cross-sectional side view of a screw pair for preventing automatic rolling movement in a loosening direction according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a central longitudinal cross-sectional side view of a screw pair for preventing automatic rolling movement in a loosening direction according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a cross-sectional side view of a screw pair for preventing automatic rolling movement in a loosening direction according to a third embodiment of the present invention;

fig. 4 is a schematic diagram of a cross-sectional side view of a screw pair for preventing automatic rolling movement in a loosening direction according to a fourth embodiment of the present invention.

In the figure: 1. bolt, 2, first nut, 3, second nut, 4, work piece.

Detailed Description

The screw pair for preventing the loosening-direction automatic rolling motion according to the present invention will be described in further detail with reference to the following embodiments.

Example 1

As shown in fig. 1, the thread pair for preventing automatic rolling movement in a loosening direction comprises a bolt 1, a first nut 2 and a second nut 3, wherein the major diameter of an internal thread of the second nut 3 is smaller than the major diameter of an external thread of the bolt 1, after the bolt 1, the first nut 2 and the second nut 3 are installed and tightened on a workpiece 4, the bottom of the first nut 2 contacts with the workpiece 4, the bottom of the second nut 3 contacts with the top of the first nut 2, a contact structure for mutual transverse locking is formed between the thread bottom of the internal thread of the second nut 3 and the thread crest of the bolt 1, a structure for mutual contact is formed between the upper thread side of the internal thread of the first nut 2 and the lower thread side of the external thread of the bolt 1, a structure for mutual contact is formed between the upper thread side of the internal thread of the second nut 3 and the lower thread side of the external thread of the bolt 1, and a longitudinal gap is formed between the external thread of the bolt 1 and the internal thread of the first nut 2, the large diameter of the internal thread of the first nut 2 is larger than the large diameter of the external thread of the bolt 1, the small diameter of the internal thread of the first nut 2 is larger than the small diameter of the external thread of the bolt 1, and the material of the part where the thread bottom of the internal thread and the thread top of the external thread are contacted with each other is not nylon, rubber or synthetic resin.

Preferably, the bolt 1 and the second nut 3 are metal fasteners.

Preferably, said first nut 2 is a standard thin nut.

Example 2

As shown in fig. 2, the thread pair for preventing automatic rolling movement in a loosening direction comprises a bolt 1, a first nut 2 and a second nut 3, wherein the major diameter of an internal thread of the second nut 3 is smaller than the major diameter of an external thread of the bolt 1, after the bolt 1, the first nut 2 and the second nut 3 are mounted and screwed on a workpiece 4, the bottom of the first nut 2 contacts with the workpiece 4, the bottom of the second nut 3 contacts with the top of the first nut 2, a contact structure for mutual transverse locking is formed between the thread bottom of the internal thread of the second nut 3 and the thread crest of the bolt 1, a structure for mutual contact between the lower thread side of the internal thread of the first nut 2 and the upper thread side of the external thread of the bolt 1, a structure for mutual contact between the upper thread side of the internal thread of the second nut 3 and the lower thread side of the external thread of the bolt 1, and a longitudinal gap is formed between the external thread of the bolt 1 and the internal thread of the first nut 2, the large diameter of the internal thread of the first nut 2 is larger than the large diameter of the external thread of the bolt 1, the small diameter of the internal thread of the first nut 2 is larger than the small diameter of the external thread of the bolt 1, and the material of the part where the thread bottom of the internal thread and the thread top of the external thread are contacted with each other is not nylon, rubber or synthetic resin.

Preferably, the bolt 1 and the second nut 3 are metal fasteners.

Preferably, said first nut 2 is a standard thin nut.

Example 3

As shown in fig. 3, the thread pair for preventing automatic rolling movement in a loosening direction includes a bolt 1, a first nut 2 and a second nut 3, a minor diameter of an internal thread of the second nut 3 is smaller than a minor diameter of an external thread of the bolt 1, after the bolt 1, the first nut 2 and the second nut 3 are mounted and screwed on a workpiece 4, a bottom of the first nut 2 contacts with the workpiece 4, a bottom of the second nut 3 contacts with a top of the first nut 2, a contact structure for mutual lateral locking is formed between a crest of the internal thread of the second nut 3 and a root of the external thread of the bolt 1, a structure for mutual contact between an upper crest of the internal thread of the first nut 2 and a lower crest of the external thread of the bolt 1, a structure for mutual contact between an upper crest of the internal thread of the second nut 3 and a lower crest of the external thread of the bolt 1, and a longitudinal gap is formed between the external thread of the bolt 1 and the internal thread of the first nut 2, the large diameter of the internal thread of the first nut 2 is larger than the large diameter of the external thread of the bolt 1, the small diameter of the internal thread of the first nut 2 is larger than the small diameter of the external thread of the bolt 1, and the parts of the internal thread crests and the external thread roots which are contacted with each other are made of materials other than nylon, rubber and synthetic resin.

Preferably, the bolt 1 and the second nut 3 are metal fasteners.

Preferably, said first nut 2 is a standard thin nut.

Example 4

As shown in fig. 4, the thread pair for preventing automatic rolling movement in a loosening direction includes a bolt 1, a first nut 2 and a second nut 3, a minor diameter of an internal thread of the second nut 3 is smaller than a minor diameter of an external thread of the bolt 1, after the bolt 1, the first nut 2 and the second nut 3 are mounted and screwed on a workpiece 4, a bottom of the first nut 2 contacts with the workpiece 4, a bottom of the second nut 3 contacts with a top of the first nut 2, a contact structure in which a crest of the internal thread of the second nut 3 and a root of the external thread of the bolt 1 are locked with each other in a transverse direction is formed between the crest of the internal thread of the second nut 3 and the root of the external thread of the bolt 1, a structure in which a lower flank of the internal thread of the first nut 2 and an upper flank of the external thread of the bolt 1 contact with each other, a structure in which an upper flank of the internal thread of the second nut 3 and a lower flank of the external thread of the bolt 1 contact with each other, and, the large diameter of the internal thread of the first nut 2 is larger than the large diameter of the external thread of the bolt 1, the small diameter of the internal thread of the first nut 2 is larger than the small diameter of the external thread of the bolt 1, and the parts of the internal thread crests and the external thread roots which are contacted with each other are made of materials other than nylon, rubber and synthetic resin.

Preferably, the bolt 1 and the second nut 3 are metal fasteners.

Preferably, said first nut 2 is a standard thin nut.

The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.