CN111577742A - Never-loosening self-tightening bolt washer and nut system - Google Patents
Never-loosening self-tightening bolt washer and nut system Download PDFInfo
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- CN111577742A CN111577742A CN202010474721.1A CN202010474721A CN111577742A CN 111577742 A CN111577742 A CN 111577742A CN 202010474721 A CN202010474721 A CN 202010474721A CN 111577742 A CN111577742 A CN 111577742A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/005—Means to increase the friction-coefficient
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
The invention discloses a never-loosening self-tightening bolt washer and nut system which comprises a fastening rod, a fastening nut, a washer and a locknut, wherein the fastening rod comprises a fastening thread section and a lockthread section with opposite thread turning directions, and the fastening nut is in threaded connection with the fastening thread section; the contact surface of the washer and the fastening nut is a step surface in smooth transition, and the step surface of the washer is matched with the step surface of the fastening nut; the locknut is in threaded connection with the locking thread section and is tightly connected with the washer. Adopt the never loose self-tightening bolt washer nut system of this application, on the one hand, constitute the self-tightening structure between anchorage bar, fastening nut, packing ring and the locknut, on the other hand, when the not hard up reversal that takes place of fastening nut, drive locknut antiport through the packing ring, and locknut's antiport can further strengthen the positive pressure to packing ring and fastening nut, forms a never loose self-tightening bolt washer nut system, has advantages such as locking reliable, installation compactness.
Description
Technical Field
The invention relates to the technical field of bolt fasteners, in particular to a never-loosening self-tightening bolt washer and nut system.
Background
Under the action of static load, the connecting screw thread can meet the self-locking condition, and the friction torque among the nut, the bolt head and the bearing surface also has the anti-loosening function. However, under the conditions of variable load, large impact, large vibration and large temperature change, the friction force between the thread pair and between the nut, the bolt head and the bearing surface can disappear instantly, and after repeated times, the connection can be loosened and even loosened, which causes serious accidents.
The anti-loosening is to prevent the thread pair from working to generate relative rotation. According to the different principle of anti-loosing, the common anti-loosing methods include 3 types of friction anti-loosing, mechanical anti-loosing and permanent locking anti-loosing. The friction locking is simple and convenient, the mechanical locking reliability is high, and the important connection adopts mechanical locking. The permanent locking has the advantages of punching point, riveting, bonding, brazing locking and the like, and is reliable in locking, but the thread pair is generally not reusable after being disassembled, so that the permanent locking is generally used for connection which is not disassembled after being assembled.
First, basic method for preventing nut from loosening
The tightening of nuts has been a long and unabated topic in mechanical design, such as japanese eccentric nuts, down nuts and chinese self-tightening king nuts. The most basic methods for securing the nut are as follows.
1. Washer anti-loosening
The washer refers to the part that is cushioned between the connected piece and the nut. A generally flat metal ring protects the surface of the article being joined from being scratched by the nut and distributes the pressure of the nut against the article being joined.
2. Flat washer and spring washer check
The spring washer is made of spring steel, the assembled washer is pressed flat, the resilience force of the spring washer enables the screw thread pair to keep pressing force, and the inclined plane cutting edge of the washer also has anti-loosening function, so that the anti-loosening is reliable.
3. Self-locking nut anti-loose
One end of the nut is made into a non-circular closing-in or a radial closing-in after the seam is opened, the closing-in is expanded after the nut is screwed down, and the screwing threads are compressed by the elasticity of the closing-in. The anti-loose and anti-seismic device is mainly used for special occasions such as anti-loose and anti-seismic. The principle of action is self-locking by friction force. The self-locking nut is functionally divided into a metal anti-loosening device with a nylon ring embedded, a neck closing-in and an effective torque type anti-loosening nut.
4. Nut anti-loosening liquid
The anti-loosening liquid for the nut is smeared at the tightening position of the bolt, and then the nut is screwed, so that the anti-loosening effect can be achieved.
5. Double nut anti-loose
The left-handed nut and the right-handed nut are matched with each other to tighten and prevent looseness, and the method is good. The opposite-top nut utilizes two opposite-top actions to enable the screwing threads to always bear the action of additional pressing force and friction force, has a simple structure, and can be used in low-speed heavy-load occasions.
6. Screw nut drilling and pin fixing anti-loose (pin anti-loose)
The pin is mainly used for assembly positioning and can also be used for overload shearing connection in connection and anti-loosening safety devices. The pin types include a cylindrical pin, a conical pin, a holed pin, a cotter pin, a shear pin, and the like. After the groove-shaped nut is screwed, the opening pin penetrates through a small hole at the tail part of the bolt and a groove of the nut, or the opening pin hole can be drilled after the common nut is screwed, and the method is suitable for connecting high-speed mechanical moving parts with large impact and vibration.
7. Round nut and stop washer anti-loosening
The inner upwarp of the gasket is embedded into the groove of the bolt (shaft), and one of the outer upwarps of the gasket is folded and embedded into one groove of the nut after the nut is screwed down, so that the application is wide.
8. Check washer anti-loosening
The relative position of the nut and the connected piece is fixed by using the folded edge of the gasket, so that the application is less due to structural limitation.
9. Series steel wire anti-loose
The low carbon steel wire is inserted into the holes at the head of each screw, and the screws are connected in series to brake mutually. The direction of penetration of the steel wire must be taken care of when in use. The locking device is suitable for screw connection, and is reliable in locking and inconvenient to disassemble.
Introduction of self-locking and never-loosening nut in different countries
Since 1550 the invention of a screw and nut fastener, the anti-loosening technique has been explored, and many accidents have been caused by the loosening of a small screw. The working principle of the never-loose nut is that the self-locking is carried out by adopting the friction force between the nut and the bolt. But the reliability of such self-locking is reduced in dynamic loads. In some important occasions, some anti-loosening measures can be taken to ensure the locking reliability of the nut. The locking and looseness prevention of the nut in various countries in the world are different.
1. Japanese "Hard Lock" nut
The Hard Lock nut has a simple concept that wedges are wedged between the nut and a screw to play a role in preventing loosening. However, it is not efficient nor practical to wedge the wedge into the nut to be used at the construction site. How can a nut have the function of a wedge? Japanese has performed a meditation in the forest. The method that he thinks of is to use two nuts in a concave and convex shape on one screw. The lower part of the nut is convex, and the center of the nut slightly shifts (eccentric processing) during processing to play a role of a wedge. The nut with the concave upper part does not perform machining (circular machining) deviating from the center, so that the function of driving the wedge by the hammer is formed. The two nuts are combined into one, and the problem of loosening is solved easily.
The hadamard nut was adopted by a large private railway company in kangxi japan in 1976, and is used exclusively for electric power equipment, and the industry has been rapidly developed since then. Hadamard nuts also showed exceptional performance in the vibration tests of NAS (national aerospace standards) which is considered to be the most stringent worldwide.
Except for railways, Hadelock nuts are adopted in many countries and regions at home and abroad, such as the longest suspension bridge in the world in Japan, the highest free-standing wave tower in the world, the Tokyo sky tree, the space shuttle launching platform in the United states, the ocean drilling machine and the like.
In more than China, countries in the world, including British, Australia, America and the like, which have long-distance advanced technology levels, need to order small nuts from Hadlock to Hedlock, and only one nut in the world is thought to have the largest market share, so that the purpose of one nut is achieved.
The fastening degree of the nut is circulated by experimental data, the nut cannot be loosened even if high-speed vibration is carried out for 3 ten thousand times, and the nut can last for 17 minutes even if high-intensity earthquake occurs. For machines operating at high speeds, such nuts are certainly the most suitable fasteners.
Although the price is 4 to 5 times higher than that of the common nut, once the nut is screwed down, the nut needs no maintenance, and huge maintenance and repair cost can be saved.
Although many imitators, few succeed. "simulated all the time, never surpassed", the company's unique technology and know-how that has accumulated throughout the year, with different corresponding eccentricities for different sizes and materials, is the key to the inability of hadamard nuts to be simulated.
The hadamard nut has the main characteristics that:
1. the anti-loosening effect is very good and semi-permanent;
2. the middle position of the male thread can be completely fastened;
3. can be repeatedly used;
4. simple and good operability;
5. the overall cost provides an economic advantage.
However, hadrock fasteners have a fatal inherent deficiency in construction. The hadamard fastener works with two nuts, the second nut relying on eccentric pressure to lock the first nut to achieve the anti-loosening purpose. There are the following problems:
1. the nut is subjected to eccentric pressure by fastening, the thread occlusion of the nut and the bolt is necessarily deviated to one side, and the thread is not uniformly stressed;
2. because the nut is under eccentric pressure, the bolt is added with bending stress and shearing stress in the direction vertical to the axis of the bolt besides normal tensile stress, and the fatigue strength of the fastener is seriously influenced;
3, after the convex and concave butt joints of the two nuts in the convex and concave shapes are firmly cemented, tapping the two nuts for one time, otherwise, screwing the concave nut in place;
4, after the convex and concave nuts are firmly cemented and tapped, the convex and concave nuts must be integrally screwed on the bolt, so that a large installation space is required;
5. the Hardelock nut can be screwed off only by simultaneously screwing the concave and convex nuts;
6. it is expensive.
2. German 'HEICO-LOCK' nut
In the twentieth past century, german engineers initiated a wedge-type locking concept that utilizes clamping force rather than friction to prevent bolt loosening. The HEICO-LOCK wedged locking system has radial sawteeth in the outer surface and wedged inner surface, and the wedged inner surfaces are opposite to each other and used in pairs during installation. The outer surface of the sawtooth is meshed with the contact surface of the part when the sawtooth is screwed down.
During tightening, the HEICO-LOCK remains stationary and displacement occurs between the wedge-shaped inner surfaces until the desired pretension is achieved. The slope of the wedge is greater than the lead angle, and when the bolt connection spins due to vibration, expansion action of the HEICO-LOCK occurs along the thickness direction, so that the increase of the clamping force is triggered.
The HEICO-LOCK can maintain 80% pre-tightening force through verification.
3. Novel self-locking nut of original Soviet Union
According to the report of Su Union mechanical manufacturing report No. 10 in 1997, a self-locking nut with simple structure and convenient manufacture is developed in the Su Union. The nut is made of a common hexagonal nut (FOCT 5915-70). Milling an annular groove on each of two end faces of the nut, drilling 4 or more through holes parallel to the central line of the threaded hole through the annular groove, then penetrating a spring clamp made of spring steel wires (9389-75) through the through holes, cutting the end of the spring clamp into sharp corners, and finally bending the end cut into the sharp corners in the direction of screwing the nut. When the nut is tightened, the bent end slides freely along the surface of the fastening element, when fully tightened, the bend is pressed into the annular groove, and when the nut loosens itself, the tip of the spring clip cuts into the fastened element, thereby preventing the nut from loosening itself. It follows that the more spring clips, the greater the self-locking force of the nut.
Compared with the widely used threaded connecting piece with the spring washer (FOCT6402-70), the self-locking nut has the advantages of simple structure, convenient manufacture, small overall dimension, good economy and particularly improved fastening reliability.
The self-locking nut is suitable for fastening parts of various machines and mechanisms working under the conditions of large vibration and impact.
4. Chinese self-tightening nut
The Chinese auto-tighting nut is a patent product developed by Shenzhen auto-tighting technology, the bright phase is disclosed for the first time in Shenzhen in 8/18 th of 2015, and the problem is solved by one nut and one washer.
Through detection of two mechanisms of medium iron and aerospace 708, the nut does not fall off after the nut vibrates for 17 minutes on a destructive vibration table, and the average residual axial force after vibration reaches 93%.
The self-tightening nut contains active self-tightening force, and the rotation can generate larger reverse self-tightening force, so that the safety and the reliability are better. The nut is self-tightened, and is more firm when being screwed on than when being welded on, and cannot be loosened at all. The nut has smaller pretightening force than the Hadlock nut, the anti-loosening force kills the Hadlock nut in seconds, and the price advantage is also obvious. The bionic tool can be repeatedly used and can be easily screwed off without damage through the bionic tool.
The self-tightening king has the disadvantages that if the nut is screwed reversely, the slope of the interface slope of the nut and the washer is turned upwards, the washer gives an upward force to the nut, and since the outer lead angle of the nut is larger than the inner lead angle, the nut cannot be screwed out singly, and meanwhile, the slope of the interface gives a downward force to the washer, so that the friction force between the washer and the fastened workpiece is increased, the total friction force counteracts the outward turning force of the nut on the outer slope surface, and the nut cannot be screwed out singly. If you want to loosen the nut you must thread the washer below.
5. Double-nut reverse thread anti-loosening fastening device (China)
A double-nut reverse-thread anti-loosening fastening device is composed of a forward and reverse double-thread screw, a fastening nut and a limiting nut, and is characterized in that the fastening nut is close to a fastening piece, the limiting nut is close to the fastening nut, the thread rotating directions of the fastening nut and the limiting nut are opposite, when the fastening nut is a right-handed thread, the limiting nut is a left-handed thread, and when the fastening nut is a left-handed thread, the limiting nut is a right-handed thread; one, two or more arc-shaped grooves are formed in the side face, close to the limiting nut, of the fastening nut, the arc-shaped grooves are formed in the side face, from shallow to deep, of the fastening nut, the rotating direction from the shallow to the deep is opposite to the rotating direction of the limiting nut, and if the arc-shaped grooves are formed in the two or more arc-shaped grooves, the arc-shaped grooves are distributed on the same circle; one, two or more blind holes are arranged on the limiting nut close to the fastening nut, and if the two or more blind holes are arranged, the blind holes are distributed on the same circle; the positioning pin can be matched with the arc-shaped groove when the side surface of the fastening nut is contacted with the side surface of the limiting nut; the blind hole is internally provided with a positioning pin which can move along the central shaft of the blind hole, the positioning pin is divided into two parts, one part is a non-elastic end of the positioning pin and is made of elastic materials, and the other part is an elastic end of the positioning pin and is made of elastic materials.
Compared with the common double-nut fastening, the mode can realize the mutual locking function of the forward nut and the reverse nut, thereby ensuring the reliability and the safety of the mechanical fastener in the vibration environment.
6. Self-tightening nut and bolt fastener (ZL 2015103172659)
The invention discloses a self-tightening nut fastener which comprises a self-tightening nut body 1, a self-tightening washer 2 and a common bolt 3. The contact surface of the self-tightening nut body and the self-tightening washer is a smooth transition spiral surface, and the self-tightening nut body is in threaded connection with the common bolt. This self-tightening nut, bolt fastener adopts the self-tightening principle, sets up a self-tightening structure on nut or bolt, makes its locking back reach the effect of self-tightening, lets the nut no longer appear shifting or not hard up, and this self-tightening nut bolt has revolutionary using value in can the wide application railway, bridge and the building trade.
7. Reusable fastener (ZL 201810360169.6)
The invention discloses a reusable fastener, which comprises a screw, a main nut, an anti-rotation clamping cap and a secondary nut, wherein the screw is provided with a section of first gap along the axial direction from the end part, the section of the main nut is T-shaped, namely the main nut is provided with a raised secondary cap along the axial direction, the middle part of the main nut is a threaded through hole matched with the screw, and the outer side surface of the secondary cap is densely provided with strip-shaped grooves; the section of the anti-rotation clamping cap is H-shaped, a smooth through hole along the axial direction is arranged in the middle part of the anti-rotation clamping cap, and a second notch is arranged on the smooth through hole, so that the through hole is an arc-shaped through hole, and the second notch is matched with the first notch; the inner side surfaces of the upper end and the lower end of the anti-rotation clamping cap are provided with elastic clamping heads; the middle part of the secondary screw cap is a threaded through hole matched with the screw rod, and strip-shaped grooves are also densely distributed on the outer wall of the secondary screw cap along the axial direction. The fastening piece can be never loosened in any violent vibration, the fastening precision is very high, and the fastening piece is not damaged and can be repeatedly disassembled and used within the service life of materials.
8. Locknut, locking mechanism and locking component (ZL 201810260933.2)
The invention provides a locknut, which comprises a first nut 1 and a second nut 2; first nut and second nut fasten simultaneously on same bolt 4, one of them of the contact surface of first nut and second nut is inclined plane 5, the horizontal terminal surface and the outside work piece butt of nut, after first nut and the coaxial setting of second nut and butt, there is a gap of taking the angle between first nut and the second nut, continue to twist the second nut to the direction of first nut, along with the diminishing in gap, make the eccentric value that produces between the two, along with the vibrational force increase of outside work piece, the eccentric value increases, thereby the nut has been avoided not hard up. The locknut has the advantages of simple processing technology, lower requirements on materials and tools, lower processing cost and no influence of metal ductility and fatigue
9. Multifunctional anti-loose bolt and nut (ZL 201810797516.1)
The invention comprises a screw connection rod piece, a fastening nut and a locking nut. The main part of spiro union member has fastening spiro union portion, and the at least one end of spiro union member has locking spiro union portion, and fastening spiro union portion is provided with external screw thread structure, and locking spiro union portion is provided with external screw thread structure or interior screw hole structure, the spiral of fastening spiro union portion to with the spiral of locking spiro union portion is opposite, and the locking nut is provided with first hole and second hole, and when fastening spiro union portion was external screw thread structure, the second hole had interior screw hole structure, and when locking spiro union portion was interior screw hole structure, the second hole had external screw thread structure. The invention can prevent the self-loosening phenomenon of the bolt and the nut and the development thereof.
10. Self-locking threaded nut
The self-locking thread nut has its unique structure, for example, a 30 deg. wedge-shaped slope is formed at the root of the female thread, so that when the bolt and the nut are tightened with each other, the tip of the bolt is tightly pressed against the wedge-shaped slope of the self-locking thread, thereby generating a large locking force. The normal force resulting from contact between the threads is at an angle of 60 to the bolt axis due to the change in angle of the profile, rather than 30 as with conventional threads. Obviously, the thread normal pressure is much greater than the fastening pressure, so the generated anti-loosening friction force is necessarily greatly increased. When the bolt tension is also P0When the normal pressure P of the conventional 60-degree angle thread is 1.15P0,
The self-locking thread has a wedge-shaped inclined plane with an angle of 30 degrees at the root, the angle and the size of the normal pressure of the self-locking thread are changed, and the normal pressure P is 2P0The ratio of the normal pressure to the normal pressure is about 12: 7 the anti-loose friction of the self-locking thread is correspondingly increased.
The wedge-shaped surface of the self-locking thread can also solve the problems of uneven stress, tripping and seizure of the common thread and the like.
Common threads-60 deg. angle V-threads carry 70% -80% of the load on their first and second mating surfaces, while the latter mating surfaces carry little load. Therefore, under the condition of working vibration load, the common threaded fastener can easily overcome the locking force on the thread contact surface to rotate and further loosen, which is the reason for loosening the common threaded fastener.
11. Anti-loose self-tightening nut and bolt (ZL 201620291690.5)
The invention discloses an anti-loosening self-tightening nut and an anti-loosening self-tightening bolt, wherein the self-tightening nut comprises a self-tightening nut body and a first self-tightening gasket, and the contact surface of the self-tightening nut body and the first self-tightening gasket is one or more smooth and transitional spiral surfaces; the self-tightening bolt comprises a self-tightening bolt body and a second self-tightening gasket, and the contact surface of the self-tightening bolt body and the second self-tightening gasket is one or more helical surfaces in smooth transition. The self-tightening nut body and the self-tightening bolt body are not displaced or loosened any more by adopting a self-tightening principle and arranging the self-tightening structure on the self-tightening nut body or the self-tightening bolt body, so that the self-tightening nut body and the self-tightening bolt body achieve a self-tightening effect after being locked; the overall design is novel, and the practicality is strong, easily uses widely. But its anti-loosening performance is yet to be further enhanced.
In summary, the thread locking structure or locking structure in the prior art has certain disadvantages, and further improvement and optimization are needed.
Disclosure of Invention
In view of this, the invention provides a never-loosening self-tightening bolt, washer and nut system aiming at the defects of the prior art, so that the system has the advantages of reliable looseness prevention and compact installation.
The invention solves the problems through the following technical means: a never-loosening self-tightening bolt washer-nut system comprises a tightening rod, a tightening nut, a washer and a locknut, wherein the tightening rod comprises a tightening thread section and a lockthread section with opposite thread turning directions, the diameter of the tightening thread section is larger than that of the lockthread section, and the tightening nut is in threaded connection with the tightening thread section; the contact surface of the washer and the fastening nut is a step surface in smooth transition, and the step surface of the washer is matched with the step surface of the fastening nut; the locknut is in threaded connection with the locking thread section and is tightly connected with the washer.
Further, the contact surface of the washer and the locknut is a sawtooth surface.
Further, the step surface of the fastening nut is a slope surface gradually descending along the loosening direction of the fastening nut.
Further, the fastening thread section is a triangular thread.
Further, the anti-loosening thread section is a trapezoidal thread.
Further, the fastening thread section is a positive thread, and the anti-loosening thread section is a negative thread.
Further, the inner section of the gasket is circular, and the outer section of the gasket is hexagonal.
The invention has the beneficial effects that:
the invention relates to a never-loosening self-tightening bolt washer and nut system, which comprises a tightening rod, a tightening nut, a washer and a locknut, wherein the tightening rod comprises a tightening thread section and a lockthread section with opposite thread turning directions; the contact surface of the washer and the fastening nut is a step surface in smooth transition, and the step surface of the washer is matched with the step surface of the fastening nut; the locknut is in threaded connection with the locking thread section and is tightly connected with the washer. Adopt the never loose self-tightening bolt washer nut system of this application, on the one hand, constitute the self-tightening structure between anchorage bar, fastening nut, packing ring and the locknut, on the other hand, when fastening nut receives vibration not hard up to take place the reversal, drive locknut antiport through the packing ring, and locknut's antiport can further strengthen the positive pressure to packing ring and fastening nut, forms a never loose self-tightening bolt washer nut system, has advantages such as locking reliable, installation compactness.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a washer according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a fastening nut according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1-3, the never-loosening self-tightening bolt-washer-nut system of the present embodiment includes a tightening rod, a tightening nut 3, a washer 5 and a locknut 2, wherein the tightening rod includes a tightening thread section 4 and a lockthread section 1 with opposite thread directions, the tightening rod may be designed into a bolt-type structure or a screw-type structure according to needs, and in the present embodiment, the tightening rod is a bolt-type structure; the fastening thread section 4 is a positive thread and the anti-loosening thread section 1 is a negative thread, however, in some embodiments, the fastening thread section 4 may be designed as a negative thread, and the anti-loosening thread section 1 is correspondingly designed as a positive thread. The diameter of the fastening thread section 4 is larger than that of the anti-loosening thread section 1, so that the fastening nut 3 can be conveniently installed. The fastening nut 3 is in threaded connection with the fastening thread section 4, the contact surface of the gasket 5 and the fastening nut 3 is a smoothly-transitional step surface 6, and the step surface of the gasket is matched with the step surface of the fastening nut; the locknut 2 is in threaded connection with the lockthread section 1 and is tightly combined with the washer 5.
The contact surface of the washer 5 and the locknut 2 is a sawtooth surface 7 so as to improve the friction coefficient between the washer 5 and the locknut 2.
The inner section of the gasket 5 is circular, and the outer section of the gasket is hexagonal.
The fastening thread section 4 is a triangular thread to strengthen the fastening force of the fastening nut 3 to a fastened piece; the anti-loosening thread section 1 is a trapezoidal thread to enhance the torque transferring effect of the fastening nut 3 on the anti-loosening nut 2.
The length of the fastening thread section is such that the exposed length is the shortest after the fastening member, fastening nut and washer are mounted in place. The space interval between the fastening nut and the locknut is reduced, firstly, the locknut is guaranteed to be butted with the gasket after being screwed in place and certain positive pressure is generated, and secondly, the total length of the fastening rod is reduced.
In the specific design, the axial tensile bearing capacity and the transverse shear bearing capacity of the fastening rod are approved through calculation. Under the condition that the axial tensile bearing capacity of the self-locking nut is coordinated with the thread shearing resisting bearing capacity of the two nuts, the thickness of the two nuts is reduced as much as possible, so that the length of the fastening rod is reduced, and finally the installation space of the positive and negative screw opposite-top nut self-locking system is reduced.
The installation sequence of the system is as follows: the fastening rod, the fastening nut 3, the washer 5 and the locknut 2; the disassembly sequence is as follows: locknut 2, washer 5, fastening nut 3, finally the fastening rod is dismantled from the piece to be fastened.
Adopt the never loose self-tightening bolt washer nut system of this embodiment, on the one hand, utilize the self-tightening principle, make the anchorage bar through the ladder face, fastening nut, constitute the self-tightening structure between packing ring and the locknut, on the other hand, when fastening nut receives vibration not hard up to take place the reversal, rotation through the ladder face drives packing ring antiport, the frictional force between rethread packing ring and the locknut drives locknut antiport, and locknut's antiport can further increase the positive pressure to packing ring and fastening nut, form a never loose self-tightening bolt washer nut system, have locking reliable, advantages such as installation compactness.
As a further improvement to the above technical solution, the stepped surface of the fastening nut is a slope surface gradually descending around the loosening direction of the fastening nut, specifically, both surfaces of the stepped surface are slope surfaces. By adopting the structural design, when the fastening nut is loosened, the fastening nut pushes the washer outwards, namely the fastening nut can apply a pushing force to the locknut through the washer, so that a large enough positive pressure is formed between the washer and the locknut, and a large enough friction force is ensured between the washer and the locknut, thereby driving the locknut to rotate to form self-locking.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides a never become flexible from tighting bolt washer nut system which characterized in that: the anti-loosening fastening device comprises a fastening rod, a fastening nut, a washer and a locknut, wherein the fastening rod comprises a fastening thread section and a lockthread section with opposite thread turning directions, the diameter of the fastening thread section is larger than that of the lockthread section, and the fastening nut is in threaded connection with the fastening thread section; the contact surface of the washer and the fastening nut is a step surface in smooth transition, and the step surface of the washer is matched with the step surface of the fastening nut; the locknut is in threaded connection with the locking thread section and is tightly connected with the washer.
2. The never-loose, self-tightening bolt, washer, and nut system according to claim 1, wherein: the contact surface of the washer and the locknut is a sawtooth surface.
3. The never-loose, self-tightening bolt, washer, and nut system according to claim 2, wherein: the step surface of the fastening nut is a slope surface which gradually descends along the loosening direction of the fastening nut.
4. The never-loose, self-tightening bolt, washer, and nut system according to claim 3, wherein: the fastening thread section is a triangular thread.
5. The never-loose, self-tightening bolt, washer, and nut system according to claim 4, wherein: the anti-loosening thread section is a trapezoidal thread.
6. The never-loose, self-tightening bolt, washer, and nut system according to claim 5, wherein: the fastening thread section is a positive thread, and the anti-loosening thread section is a negative thread.
7. The never-loose, self-tightening bolt, washer, and nut system according to claim 6, wherein: the inner section of the gasket is circular, and the outer section of the gasket is hexagonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474721.1A CN111577742A (en) | 2020-05-29 | 2020-05-29 | Never-loosening self-tightening bolt washer and nut system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474721.1A CN111577742A (en) | 2020-05-29 | 2020-05-29 | Never-loosening self-tightening bolt washer and nut system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111577742A true CN111577742A (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010474721.1A Withdrawn CN111577742A (en) | 2020-05-29 | 2020-05-29 | Never-loosening self-tightening bolt washer and nut system |
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| CN (1) | CN111577742A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628273A (en) * | 2020-12-04 | 2021-04-09 | 江苏远兴集团建设有限公司 | Anti-loosening mechanism |
| TWI820859B (en) * | 2022-08-11 | 2023-11-01 | 黃文彬 | Eccentric anti-loosening screw manufacturing and construction method |
-
2020
- 2020-05-29 CN CN202010474721.1A patent/CN111577742A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628273A (en) * | 2020-12-04 | 2021-04-09 | 江苏远兴集团建设有限公司 | Anti-loosening mechanism |
| TWI820859B (en) * | 2022-08-11 | 2023-11-01 | 黃文彬 | Eccentric anti-loosening screw manufacturing and construction method |
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Application publication date: 20200825 |