1. Prevent to do the automatic rolling threaded fastener who moves of not hard up direction, including nut, packing ring and bolt, its characterized in that: a conical concave surface is arranged at the bottom of the nut, and the angle theta of the conical concave surface is smaller than the internal thread angle alpha of the nut and the external thread angle beta of the bolt; a through hole for a screw rod of the bolt to pass through is formed in the center of the gasket, the aperture of the through hole is larger than the major diameter of the external thread of the bolt, the height h of the through hole is larger than the thread pitch of the external thread of the bolt, a conical convex surface is arranged at the top of the gasket, and the height of the gasket is not larger than that of the conical concave surface; after the nut, the washer and the bolt are installed and screwed on a workpiece, the bottom of the nut is contacted with the workpiece; after the gasket is deformed, a contact structure without a transverse gap is arranged between the conical convex surface and the conical concave surface, and a contact structure without a transverse gap is arranged between the through hole and the external thread of the bolt; a longitudinal gap is formed between the external thread of the bolt and the internal thread of the nut, the major diameter of the internal thread of the nut is larger than that of the external thread of the bolt, and the minor diameter of the internal thread of the nut is larger than that of the external thread of the bolt; the material of the contact part of the conical convex surface and the conical concave surface is not nylon, wood, rubber or synthetic resin; the material of the part of the through hole, which is contacted with the external thread of the bolt, is not nylon, wood, rubber or synthetic resin; the conical convex surface and the conical concave surface are not in a mutual self-locking structure in the longitudinal direction.

2. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the through hole is an unclosed through hole having a circumference smaller than a circumference of the external thread of the bolt.

3. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the height h of the through hole is larger than 1.5 times of the thread pitch of the external thread of the bolt.

4. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the angle theta of the conical concave surface is larger than 21 degrees and smaller than 50 degrees.

5. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the nut, washer and bolt are metal fasteners.

6. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the washer is made of a material having a hardness lower than that of the bolt.

7. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 1 wherein: the bottom of the nut is provided with a flange.

8. The threaded fastener for preventing automatic rolling movement in loosening direction of claim 4 wherein: the angle theta of the conical concave surface is larger than 22 degrees and smaller than 40 degrees.

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 proposal 6 of 'screw coupling for preventing automatic rolling movement in loosening direction' with the publication number of CN208252563U designed by the inventor has the following disadvantages: the convex part of the washer is embedded into the concave part arranged on the screw rod, and then a locking structure which can not continuously do transverse rotation motion is formed between the washer and the external thread element, so that the rolling motion in the loosening direction between the first nut and the bolt can be effectively prevented in the transverse vibration or impact process, namely, the rolling motion in the loosening direction between the first nut and the bolt can be effectively prevented by reducing the strength of the external thread in the transverse vibration or impact process.

Disclosure of Invention

The invention aims to provide a fastener which can effectively prevent a nut and a bolt from continuously doing rolling motion in a loosening direction during transverse vibration or impact, and further, the technical problem to be solved by the invention is as follows: 1. the technical scheme of the thread connection for preventing the automatic rolling motion in the loosening direction has the defects. 2. The effect of preventing the automatic rolling motion in the loosening direction is enhanced. 3. The stable locking force of the through hole of the washer to the external thread is realized when the nut is screwed down, so that the clamping force required by a workpiece is more easily obtained.

In order to solve the technical problems, the invention adopts the technical scheme that: the threaded fastener for preventing automatic rolling motion in the loosening direction comprises a nut, a washer and a bolt, wherein a conical concave surface is arranged at the bottom of the nut, and the angle theta of the conical concave surface is smaller than the angle alpha of an internal thread of the nut and the angle beta of an external thread of the bolt; a through hole for a screw rod of the bolt to pass through is formed in the center of the gasket, the aperture of the through hole is larger than the major diameter of the external thread of the bolt, the height h of the through hole is larger than the thread pitch of the external thread of the bolt, a conical convex surface is arranged at the top of the gasket, and the height of the gasket is not larger than that of the conical concave surface; after the nut, the washer and the bolt are installed and screwed on a workpiece, the bottom of the nut is contacted with the workpiece; after the gasket is deformed, a contact structure without a transverse gap is arranged between the conical convex surface and the conical concave surface, and a contact structure without a transverse gap is arranged between the through hole and the external thread of the bolt; a longitudinal gap is formed between the external thread of the bolt and the internal thread of the nut, the major diameter of the internal thread of the nut is larger than that of the external thread of the bolt, and the minor diameter of the internal thread of the nut is larger than that of the external thread of the bolt; the material of the contact part of the conical convex surface and the conical concave surface is not nylon, wood, rubber or synthetic resin; the material of the part of the through hole, which is contacted with the external thread of the bolt, is not nylon, wood, rubber or synthetic resin; the conical convex surface and the conical concave surface are not in a mutual self-locking structure in the longitudinal direction.

After the nut, the washer and the bolt are mounted and screwed on the workpiece (refer to fig. 7 and 8), a contact structure without a transverse gap is formed between the conical convex surface and the conical concave surface, so that a space for the washer and the nut to continuously perform rolling motion in a loosening direction is not formed between the conical convex surface and the conical concave surface; the through hole and the external thread of the bolt are in a contact structure without a transverse gap, namely a transverse locking structure, so that the washer and the bolt cannot continuously perform loosening rolling motion in the transverse vibration or impact. During transverse vibration or impact, if the nut tends to move transversely relative to the washer and the bolt, and if transverse self-locking can be realized between the conical convex surface and the conical concave surface, the nut cannot slide on the conical convex surface; at this moment if can not horizontal auto-lock between the circular cone convex surface with the circular cone concave surface, the nut will produce simultaneously along the trend of circular cone convex surface cunning upwards and along the trend of the external screw thread lower flank cunning of bolt, because this kind of locking structure the nut can not slide on the circular cone convex surface, that is, when transverse vibration or impact the circular cone convex surface with do not produce between the circular cone concave surface the space that becomes flexible direction rolling motion can be done with the bolt in succession to nut, consequently, when transverse vibration or impact the nut with can not do flexible direction rolling motion in succession between the bolt.

The height of the washer is not greater than that of the conical concave surface, so that the bottom of the nut and the bottom of the washer are both in contact with the workpiece after the nut is screwed on the bolt for a section, and then the locking force of the through hole of the washer on the external thread tends to be stable when the nut is continuously screwed, so that the clamping force required on the workpiece can be more easily obtained.

In order to easily realize the "contact structure without a lateral clearance" between the through hole and the external thread of the bolt "to enhance the effect of preventing the loosening-direction automatic rolling motion, it is preferable that the through hole is an unclosed through hole having a circumference smaller than that of the external thread of the bolt.

In order to smoothly realize the "contact structure without a lateral clearance between the through hole and the external thread of the bolt", the "height h of the through hole is larger than the pitch of the external thread of the bolt" is a necessary condition of the threaded fastener for preventing the automatic rolling movement in the loosening direction.

In order to enhance the effect of preventing the loosening-direction automatic rolling movement, it is preferable that the height h of the through hole is greater than 1.5 times the pitch of the external thread of the bolt.

In order to realize a "contact structure without a lateral gap between the conical convex surface and the conical concave surface" even in a situation where the longitudinal central axis of the conical convex surface, the longitudinal central axis of the internal thread of the nut, and the longitudinal central axis of the external thread of the bolt do not overlap with each other (due to a processing error, it is difficult to avoid such a situation), "the angle θ of the conical concave surface is smaller than the angle α of the internal thread of the nut and the angle β of the external thread of the bolt", which is a necessary condition for the threaded fastener to prevent the automatic rolling movement in the loosening direction.

In order to enhance the effect of preventing the loosening-direction automatic rolling motion, it is preferable that the angle θ of the concave surface of the cone is greater than 21 ° and less than 50 °.

In order to further enhance the effect of preventing the loosening-direction automatic rolling motion, it is further preferable that the angle θ of the conical concave surface is larger than 22 ° and smaller than 40 °.

In order to more easily achieve contact between the bottom of the nut and the workpiece, the washer is preferably made of a material having a hardness lower than that of the bolt.

In order to compensate for the reduced area of the bottom of the nut due to the provision of the conical recessed surface, and thereby effectively prevent the contact surface between the bottom of the nut and the workpiece from being susceptible to plastic deformation, it is preferred that the bottom of the nut be provided with a flange.

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 contact part of the conical convex surface and the conical concave surface is nylon or wood or rubber or synthetic resin, when the transverse inertia force of the nut relative to the washer and the bolt is larger than a certain value in the process of transverse vibration or impact, the nylon material or the wood material or the rubber material or the synthetic resin material can generate continuous elastic deformation, so that a space which can enable the nut to continuously perform the rolling motion in the loosening direction is generated between the conical convex surface and the conical concave surface, therefore, the condition that the material of the contact part of the conical convex surface and the conical concave surface is not nylon, wood, rubber or synthetic resin is necessary for the threaded fastener which can prevent the automatic rolling motion in the loosening direction.

If the material of the portion where the through hole and the external thread of the bolt contact each other is nylon or wood or rubber or synthetic resin, when the lateral inertial force of the bolt relative to the washer and the nut is greater than a certain value during lateral vibration or impact, the nylon material or wood material or rubber material or synthetic resin material will generate continuous elastic deformation, which will result in a space between the through hole and the external thread of the bolt for enabling the bolt to continuously perform a rolling motion in a loosening direction.

In order to enhance the effect of preventing the loosening-direction automatic rolling movement, it is preferable that the nut, the washer, and the bolt are metal material fasteners.

Because the conical convex surface and the conical concave surface are not in a mutually self-locking structure in the longitudinal direction, the position of the conical convex surface and the conical concave surface can be automatically adjusted in the installation process, so that the 'contact structure without a transverse gap between the conical convex surface and the conical concave surface' can be smoothly realized, and therefore, in order to smoothly realize the effect of preventing the automatic rolling motion in the loosening direction, the 'structure without mutually self-locking in the longitudinal direction between the conical convex surface and the conical concave surface' is a necessary condition of the threaded fastener preventing the automatic rolling motion in the loosening direction.

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 invention, the circumference of the external thread of the bolt is pi multiplied by the major diameter of the external thread of the bolt.

In the present invention, the phrase "a contact structure having no lateral gap between the conical convex surface and the conical concave surface" means "no space between the conical convex surface and the conical concave surface where the washer and the nut can perform lateral linear motion".

In the present invention, the phrase "a contact structure having no lateral clearance between the through hole and the external thread of the bolt" means that there is no space between the washer and the external thread of the bolt, in which the washer and the bolt can perform lateral linear motion.

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

The invention has the beneficial effects that: 1. the threaded fastener for preventing the automatic rolling motion in the loosening direction can effectively prevent the continuous rolling motion in the loosening direction between the nut and the bolt during the transverse vibration or impact without reducing the strength of the external thread; 2. the threaded fastener for preventing the automatic rolling motion in the loosening direction can enhance the effect of preventing the automatic rolling motion in the loosening direction; 3. the threaded fastener capable of preventing automatic rolling motion in the loosening direction can realize stable locking force of the through hole of the washer to the external thread when the nut is screwed down, so that clamping force required by a workpiece can be obtained more easily.

Drawings

Fig. 1 is a schematic perspective view of a nut according to a first embodiment of the present invention;

FIG. 2 is a schematic longitudinal sectional side view showing the center (the center of the conical concave surface and the internal thread) of the nut according to the first and second embodiments of the present invention;

FIG. 3 is a perspective view of a gasket according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of a longitudinal cross-sectional side view of the center of a gasket according to a first embodiment of the present invention;

FIG. 5 is a perspective view of a gasket according to a second embodiment of the present invention;

FIG. 6 is a schematic diagram of a longitudinal cross-sectional side view of a center of a gasket in accordance with a second embodiment of the present invention;

FIG. 7 is a schematic diagram showing a cross-sectional side view of the center (center of the male screw) of the first embodiment of the present invention in a state in which the threaded fastener is used with the automatic rolling motion in the loosening direction prevented;

fig. 8 is a schematic diagram showing a configuration of a center (center of the male screw) of a screw fastener in a use state of preventing an automatic rolling motion in a loosening direction according to a second embodiment of the present invention in a longitudinal cross section.

In the figure: 1. the bolt comprises a nut, 2, a washer, 3, a bolt, 4, a conical concave surface, 5, a through hole, 6, a conical convex surface, 7, a workpiece, 8 and a flange.

Detailed Description

The threaded fastener of the present invention which prevents automatic rolling movement in the loosening direction will be described in further detail below with reference to specific embodiments.

Example 1

As shown in fig. 1, 2, 3, 4 and 7, the threaded fastener for preventing automatic rolling movement in a loosening direction comprises a nut 1, a washer 2 and a bolt 3, wherein a flange 8 is arranged at the bottom of the nut 1, a conical concave surface 4 is arranged at the bottom of the nut 1, and an angle theta of the conical concave surface 4 is smaller than an internal thread angle alpha of the nut 1 and an external thread angle beta of the bolt 3; the material hardness of the washer 2 is smaller than that of the bolt 3, the center of the washer 2 is provided with a through hole 5 which is not closed and is used for a screw rod of the bolt 3 to pass through, the circumference of the through hole 5 is smaller than that of an external thread of the bolt 3, the aperture of the through hole 5 is larger than the major diameter of the external thread of the bolt 3, the height h of the through hole 5 is larger than the thread pitch of the external thread of the bolt 3, the top of the washer 2 is provided with a conical convex surface 6, and the height of the washer 2 is not larger than that of the conical concave surface 4; after the nut 1, the washer 2 and the bolt 3 are installed and screwed on a workpiece 7, the bottom of the nut 1 is in contact with the workpiece 7; after the gasket 2 is deformed, a contact structure without a transverse gap is formed between the conical convex surface 6 and the conical concave surface 4, and a contact structure without a transverse gap is formed between the through hole 5 and the external thread of the bolt 3; a longitudinal gap is formed between the external thread of the bolt 3 and the internal thread of the nut 1, the large diameter of the internal thread of the nut 1 is larger than that of the external thread of the bolt 3, and the small diameter of the internal thread of the nut 1 is larger than that of the external thread of the bolt 3; the material of the contact part of the conical convex surface 6 and the conical concave surface 4 is not nylon, wood, rubber or synthetic resin; the material of the part where the through hole 5 and the external thread of the bolt 3 are contacted with each other is not nylon, wood, rubber or synthetic resin; the conical convex surface 6 and the conical concave surface 4 are not in a self-locking structure in the longitudinal direction.

Preferably, the height h of the through-hole 5 is greater than 1.5 times the pitch of the external thread of the bolt 3.

Preferably, the angle θ of the conical concavity 4 is greater than 21 ° and less than 50 °.

Further preferably, the angle θ of the conical concavity 4 is greater than 22 ° and smaller than 40 °.

Preferably, the nut 1, the washer 2 and the bolt 3 are metal material fasteners.

As shown in fig. 7, after the nut 1, the washer 2, and the bolt 3 are fastened to the workpiece 7, the through hole 5 is formed with an internal thread corresponding to the external thread of the bolt 3. When the bolt is used repeatedly, the washer 2 can be screwed on the bolt 3.

Example 2

As shown in fig. 1, 2, 5, 6 and 8, the threaded fastener for preventing automatic rolling movement in a loosening direction comprises a nut 1, a washer 2 and a bolt 3, wherein a flange 8 is arranged at the bottom of the nut 1, a conical concave surface 4 is arranged at the bottom of the nut 1, and an angle theta of the conical concave surface 4 is smaller than an internal thread angle alpha of the nut 1 and an external thread angle beta of the bolt 3; the material hardness of the washer 2 is not less than that of the bolt 3, a closed through hole 5 for a screw rod of the bolt 3 to pass through is formed in the center of the washer 2, the aperture of the through hole 5 is larger than the major diameter of an external thread of the bolt 3, the height h of the through hole 5 is larger than the thread pitch of the external thread of the bolt 3, a conical convex surface 6 is arranged at the top of the washer 2, and the height of the washer 2 is not more than that of the conical concave surface 4; after the nut 1, the washer 2 and the bolt 3 are installed and screwed on a workpiece 7, the bottom of the nut 1 is in contact with the workpiece 7; after the gasket 2 is deformed, a contact structure without a transverse gap is formed between the conical convex surface 6 and the conical concave surface 4, and a contact structure without a transverse gap is formed between the through hole 5 and the external thread of the bolt 3; a longitudinal gap is formed between the external thread of the bolt 3 and the internal thread of the nut 1, the large diameter of the internal thread of the nut 1 is larger than that of the external thread of the bolt 3, and the small diameter of the internal thread of the nut 1 is larger than that of the external thread of the bolt 3; the material of the contact part of the conical convex surface 6 and the conical concave surface 4 is not nylon, wood, rubber or synthetic resin; the material of the part where the through hole 5 and the external thread of the bolt 3 are contacted with each other is not nylon, wood, rubber or synthetic resin; the conical convex surface 6 and the conical concave surface 4 are not in a self-locking structure in the longitudinal direction.

Preferably, the height h of the through-hole 5 is greater than 1.5 times the pitch of the external thread of the bolt 3.

Preferably, the angle θ of the conical concavity 4 is greater than 21 ° and less than 50 °.

Further preferably, the angle θ of the conical concavity 4 is greater than 22 ° and smaller than 40 °.

Preferably, the nut 1, the washer 2 and the bolt 3 are metal material fasteners.

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.