WO2021196345A1

WO2021196345A1 - Anti-loosening connecting bolt

Info

Publication number: WO2021196345A1
Application number: PCT/CN2020/089325
Authority: WO
Inventors: 尹云飞; 王双茂
Original assignee: 王双茂
Priority date: 2020-03-31
Filing date: 2020-05-09
Publication date: 2021-10-07
Also published as: CN111456998A

Abstract

An anti-loosening connecting bolt, comprising a bolt and a nut, which are connected to a joint surface part, wherein at least one V-shaped groove is provided in a joint end surface of the nut and the joint surface part; a metal stop elastic sheet is arranged between the nut and the joint surface part; a stop boss is arranged on a side of the metal stop elastic sheet which comes into contact with the joint surface part; a groove matching the stop boss is provided on the joint surface part; and a stop sheet is arranged on a side of the metal stop elastic sheet which comes into contact with the nut. When the nut is fastened and located at an appropriate position, the metal stop elastic sheet can mesh with the V-shaped groove on the nut under the action of an elastic force, thereby achieving a looseness prevention and stopping effect; and the anti-loosening connecting bolt has the characteristics of being reasonable and feasible in terms of structure, reliable in terms of anti-loosening effect, having a wide application range, being easy to manufacture, convenient to mount, capable of being repeatedly dismounted and used, and having a long service life.

Description

Anti-loose connecting bolt

Technical field

The invention belongs to the technical field of bolt anti-loosening, and in particular relates to an anti-loosening connecting bolt.

Background technique

The invention and application of the thread has a history of at least several hundred years. When it comes to bolts, almost no one knows. Because the bolt has entered thousands of households and is closely related to our lives. From airplanes, ships, trains, cars, to cell phones, watches, and toys, bolts are almost everywhere. Although it is small, its role cannot be ignored, and it is very important. There are countless examples like this. According to relevant information, on August 20, 2007, a Boeing 737-800 passenger plane of China Airlines caught fire and exploded after landing at Naha Airport in Okinawa. The investigation result stated that the fire was caused by a loose screw piercing the fuel tank, and a strong explosion occurred, and the fuselage was scorched and fractured. Fortunately, all 165 passengers and crew on board were evacuated safely.

As we all know, my country's medium and high-speed electrified railways, especially high-speed railways, have achieved world-renowned achievements. my country has a vast territory, a large population, and a very wide distribution. The construction of transportation is related to the national economy and the people's livelihood. Only with convenient transportation can people travel conveniently and resources can be used. The economy can only develop through reasonable allocation of mobility. Among them, countless bolt connection methods are used in the field of railway construction. For this reason, a lot of manpower, material resources, and maintenance of bolts are also invested, mainly to prevent the harm caused by bolt loosening.

With the continuous improvement of people’s living conditions, automobiles have entered our daily lives, and at the same time have brought about the vigorous development of the global automobile industry. In the daily repair and maintenance of automobiles, it is also important to check whether the bolts are loose. Indispensable work, only the reliable connection of bolts can provide safety and protection for people's travel.

In the process of industrial production and operation, the most troublesome problem is the sudden failure of factory equipment. And every equipment component is a key factor that cannot be ignored. The so-called "dikes of a thousand miles collapsed in an ant's nest" is the truth. For example: Bolt, although it is small, it has a very hot temper. Once loosening occurs, it can cause unplanned downtime in the slightest and catastrophic disaster in severe cases. At 18:35 on November 6, 2017, a female worker of Shenzhen Weihongzhi Hardware Products Co., Ltd. was knocked down by another punch that was suddenly dumped next to him. After rescue, he died because there was no installation on the base of the collapsed punch. For the anchor bolts, there should be 2 bolts on the side, but only one was installed, and it was loosened during long-term operation, and eventually the center of gravity was unbalanced and collapsed.

It can be seen that the anti-loosening measures of bolts have a very prominent position in various industries.

Commonly used anti-loosening methods for existing threaded connections (excerpted from the Mechanical Design Manual): 1) Spring washers are anti-loosing, relying on the elastic force generated by the spring washers after being flattened and their cut-out sharp corners are embedded and supported by the couplings and fasteners The surface plays a role of preventing loosening. The traditionally used spring washers such as GB/T 93, GB/T 859 and GB/T 7244 are simple in structure, low in cost, and easy to use. Due to uneven elasticity, they are not very reliable and are mostly used for unimportant connections. It is not suitable for occasions where scratches on the connecting surface and frequent disassembly are not allowed. (See Figure 5). 2) Double nuts are anti-loosening, and the two nuts are tightened against each other, so that the bolt is pulled in the screwing section and the nut is compressed, forming a threaded connection pair that is longitudinally compressed. The knot is simple, has good anti-loosening effect, low cost, and high quality. It is mostly used in occasions with low speed and heavy load or stable load. (See Figure 6). 3) To prevent loosening of the fastening nut, first use a hexagonal nut to fasten the coupling, then screw on GB/T 805-2000 "fastening nut" (the thread of the fastening nut has a gap for locking), and tighten it by hand , And then tighten with a wrench (turned approximately 60°～90°). When loosening the fastening nut, the hex nut must be tightened to create a gap between the fastening nut and then the fastening nut can be unscrewed to avoid scratching the bolt thread. The structure has good anti-loosening performance, but it is not suitable for frequent loading and unloading. For occasions; the effect of using power towers abroad is very good, and it will not loosen for decades. (See Figure 7). 4). Hexagon flange type-no locking element to prevent loosening, GB/T5789～5790-2000 and other hexagon flange bolts, GB/T6177～6177-2000 hexagon flange nuts, with enlarged bearing surface diameter (The dc is greater than 2 times the thread diameter), under a certain pre-tightening force, sufficient anti-loosening ability can be obtained. If the tooth pattern is made on the supporting surface, the anti-loosening ability will be doubled. It is also called "three-in-one bolt (female)", that is, it has the function of hexagonal wrenching part, enlarged d bearing surface, and anti-loosening function. The loose function, the three are integrated, and it is the newest contemporary hexagonal wrench fastener structure. It is suitable for high-strength (level 8 and above) fasteners in important connection situations, such as engines, forging equipment, and motorcycles. It is used in products, but the cost is high, and it is easy to damage the supporting surface of the parts. (See Figure 8). 5), non-metallic insert hexagonal lock nut to prevent loosening, the locking part of GB/T889～889.2-2000 and GB/T6182-2000 lock nut and GB/T6183.1～6183-2000 non-flange lock nut is Nylon ring without internal thread is embedded on the nut body. When the external thread is screwed in, due to the good elasticity of the nylon material, the locking force is generated, and the maximum working temperature of this type of nut should be less than 120 ℃, preferably below 100 ℃, due to the limitation of the melting point of nylon. In case of special needs, the material can be changed up to 240℃. As nylon is an inert material, it is not corroded by chemical products commonly used in the industry, but is corroded by inorganic acids, weak acids and strong alkalis. Therefore, it is not allowed to soak in acid baths such as nickel plating or galvanizing, that is, the electroplating of the nut body should be completed before the nylon ring is installed, and the electroplating should not be carried out after the nylon ring is installed. When it is retracted more than 400 times, its performance is basically stable. (See Figure 9). 6). Elastic washers are anti-loose. There are many kinds of elastic washers other than spring washers, and the standardized ones are shown in the figure. The common characteristics of these washers are: uniform elasticity, small load eccentricity, and small specifications. Due to the susceptibility of thin elastic elements to hydrogen embrittlement, attention should be paid to GB/T 860 saddle-shaped elastic washers and GB/T 955 wave elastic washers under certain load conditions. All couplings can be used. It will not scratch the surface of the connected part during work, and can be used for frequent disassembly occasions; it is often used for occasions where the gap between the connected parts is adjusted and tightened, and the low performance level, such as the connection of 5.8 and below GB/T 861.1 , GB/T 862.1 inner and outer tooth lock washers, rely on the elastic force generated by the teeth being flattened, and the resistance generated by the teeth embedded in the coupling and the supporting surface. (See Figure 10). 7) All-metal lock nuts are anti-loose. There are many varieties of this kind of nuts, and there are also many patented products. They can be roughly divided into two categories: one is to generate effective torque for local deformation of the thread, including: flattening and closing type (ellipse) Closed or square closed or circumferential closed); point pressure (one, two or three points); slotted or flattened (one or more, longitudinal or horizontal slotting), GB/T 6184～6186-2000 all metal Hexagonal lock nuts, GB/T 6183.1～6183.2-2000 all-metal hexagonal flanged lock nuts are such standard products. One type is to embed metal elastic elements to increase friction resistance and generate effective torque. This type of nut is generally suitable for high-strength external threads. (See Figure 11). 8) The screw with hole, slotted nut is equipped with split pin to prevent loosening, which is suitable for preventing loosening of important parts in variable load and vibration occasions, and has reliable performance. Inconvenient design and assembly. It is widely used in aviation, automobile and tractor industries. But it is not suitable for the anti-loosening method of double-ended studs. (See Figure 12). 9). Ordinary bolts and nuts are equipped with cotter pins to prevent loosening. When assembling, tighten the nuts before drilling; cotter pin holes can be selected according to GB/T 5278. It is suitable for the important connection of single-piece production, but not suitable for the connection of high-strength fasteners and double-ended studs. (See Figure 13). 10). Bolts with holes on the head go through the metal wire to prevent loosening. Use low carbon steel wire to penetrate the metal wire holes of the bolt heads in groups, which can mutually restrict each other and prevent loosening. Pay attention to the direction of the steel wire during installation. The illustration only applies to right-hand threads; it also applies to the anti-loosening of double-ended studs. The wire hole can be determined with reference to GB/T5278. (See Figure 14). 11). Hexagon head bolts or nuts are equipped with stop washers to prevent loosening, generally made of low carbon steel single ear (GB/T854 or double ear (GB/T855), or outer tongue (GB/T856) stop washer, Lock the hexagon head of the bolt or the nut on the connected part to prevent loosening and reliable, but requires a certain installation space. If it is a round head bolt, the anti-loose measure cannot be adopted. (See Figure 15). 12), make the thread The local materials of the coupling pair are plastically deformed and embedded in each other to prevent loosening. Single point or multiple points or riveting are punched at the end of the screw; single point or multiple points are punched at the screw head, as shown in the figure. Anti-loose performance is average. Only suitable for low-strength fasteners. (See Figure 16). 13). Fix the mutual position of the internal and external threads with the aid of adhesive to prevent loosening, bonding and screwing the threads, the method is simple, economical and effective. Its anti-loose performance is directly related to the adhesive. According to the loosening torque and temperature conditions, as well as the requirements of removable or non-removable, the appropriate adhesive is selected. (See Figure 17).

It can be seen that the commonly used anti-loosening methods 1-7 of the existing threaded connections are friction locking and anti-loosening, and the anti-loosing methods 8-11 are fixing or tightening between the fastener and the fastener with the aid of the fastener. The mechanical anti-loosening of the mutual position between the parts and the connected parts still has shortcomings during use. (Accessories for fasteners such as split pins, stop washers, metal wires). The anti-loose methods 12 to 13 are used to embed each other through the plastic deformation of their own materials and the application of other bonding materials to achieve the purpose of anti-loose. There are still deficiencies in the use process and have certain limitations.

In addition, a variety of domestic and foreign advanced "never loose bolts" have been introduced on the Internet, which are difficult to manufacture and costly. There are also special gaskets that are used to increase the frictional resistance to prevent loosening. In short, these measures are used to increase the frictional resistance to prevent loosening. The disadvantage is that the reliability of the loosening prevention will change. Poor, and is not conducive to a large number of applications.

Summary of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a reliable thread anti-loosening technology, which has a reasonable and feasible structure, reliable anti-loosening effect, wide application range, easy manufacture, convenient installation, reusable disassembly and use. Features of long life.

In order to achieve the above objective, the technical solution adopted by the present invention is:

The anti-loosening connecting bolt includes a bolt and a nut connected to the joint surface part, and is characterized in that at least one V-shaped groove is provided at the joint end surface of the nut and the joint surface part; between the nut and the joint surface part There are metal stop shrapnel; the side where the metal stop shrapnel is in contact with the joint surface part is provided with a stop boss; the joint surface part is provided with a groove that matches the stop boss; the metal stop shrapnel is in phase with the nut A stop piece is provided on the contact side.

The V-shaped groove is symmetrical in its center.

One end of the nut is provided with a V-shaped groove.

The bolt is replaced by a screw. The surface of the screw head contacting the joint surface parts is provided with a V-shaped groove, and the V-shaped groove is matched with the upper stopper; the metal stopper is arranged on the screw head and Between the joint surface parts, the metal stop elastic piece is matched with the groove provided on the joint surface part through the stop bosses on the metal stop elastic piece.

The anti-loosening connecting bolt includes a bolt 1 and a nut connected to the joint surface part 3, and is characterized in that at least one V-shaped groove is provided in the radial direction of the bolt body symmetrically along the bolt axis; the thread side of the nut 2 is provided with Metal stop shrapnel.

The metal stop elastic piece is arranged on the threaded side of the nut.

The anti-loosening connecting bolt includes a bolt and a nut connected to the joint surface parts, and is characterized in that the end face of the bolt is provided with a V-shaped groove; the side of the nut facing the end face of the bolt is provided with a metal stopper shrapnel; the rotation of the nut is determined After the position, the stop piece on the metal stop shrapnel engages with the V-shaped groove.

The stop piece 7 on the metal stop elastic piece is arranged on the threaded side of the nut.

Anti-loosening connecting bolts include bolts connected to the parts of the joint surface. The contact surface of the parts of the joint surface and the metal stopper is fixed by the cooperation of the groove and the stop boss; the brake plate on the metal stopper and The V-shaped groove on the inner side of the bolt head is nested and connected.

The bolts can be replaced by screws.

The beneficial effects of the present invention are:

Basically includes the basic form of mechanical thread connection anti-loosening, which can be selected for product design and will play a positive role.

Different from the prior art, the present invention adopts the principle of mechanical stop and anti-loosening instead of the form of relying on frictional anti-loosening. Undoubtedly, the anti-loose effect is improved from unstable to reliable anti-loose. At the same time, the existing mechanical anti-loose structure is greatly improved, avoiding the shortcomings of the existing structure.

The metal stop elastic piece adopts a metal structure, which has the advantages of 1) stable material performance, 2) strong environmental adaptability, 3) long service life, 4) high reliability; the V-shaped groove has the advantages of The strength of the bolt has little influence, can be ignored, and is easy to process. A slight change to the structure of the nut will maintain all the original characteristics of the bolt connection; the bolt, nut, and metal stop shrapnel have a simple and compact structure. The size consistency is strong, the reliability is strong, and it is easy to realize the advantages of mass production.

The thread anti-loosening principle of the present invention is similar to a ratchet and pawl meshing mechanical anti-loosening principle, which is different from the traditional principle of relying on the method of increasing friction to achieve the purpose of anti-loosing. Effective and reasonable use of the one-way anti-reversal structure similar to ratchets and pawls effectively prevents thread loosening. Due to the compact structure, scientific and reasonable, it is conducive to application. At the same time, due to its excellent mechanical properties, it can completely replace most of the existing anti-loose threads. The structure can save a lot of production resources and has considerable economic and social benefits.

Description of the drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 2(2) is a schematic structural diagram of the second embodiment of the present invention.

Figure 2(b) is the A-A view of Figure 2(a) of the present invention.

Fig. 2(c) is a schematic diagram of the bolt structure of Fig. 2(a) of the present invention.

Fig. 2(d) The right side view of Fig. 2(c) of the present invention.

Figure 3(a) is a schematic structural diagram of Embodiment 3 of the present invention.

Fig. 3(b) is the A-A view of Fig. 3(a) of the present invention.

Fig. 3(c) is a schematic diagram of the structure of the bolt in Fig. 3(a) of the present invention.

Fig. 3(d) is a schematic diagram of the structure of the metal stop elastic piece in Fig. 3(a) of the present invention.

Fig. 3(e) is a schematic view from another direction of Fig. 3(c) of the present invention.

Fig. 4 is a schematic diagram of the structure of the fourth embodiment of the present invention.

Fig. 5 is a schematic diagram of a prior art spring washer anti-loosening structure.

Fig. 6 is a schematic diagram of a double nut anti-loosening structure in the prior art.

Fig. 7 is a schematic diagram of a prior art anti-loosening structure of a fastening nut.

Fig. 8 is a schematic diagram of the prior art hexagonal flange face type-non-locking element anti-loosening structure.

Fig. 9 is a schematic diagram of the anti-loosening structure of a non-metallic insert hexagonal lock nut in the prior art.

Fig. 10 is a schematic diagram of a prior art elastic washer anti-loosening structure.

Fig. 11 is a schematic diagram of the anti-loosening structure of an all-metal lock nut in the prior art.

Fig. 12 is a schematic diagram of a prior art structure of a screw with a hole, a slotted nut and a split pin anti-loosening structure.

Fig. 13 is a schematic diagram of an anti-loosening structure of common bolts and nuts with split pins in the prior art.

Fig. 14 is a schematic diagram of a prior art anti-loosening structure of a bolt with a hole on the head through a metal wire.

Fig. 15 is a schematic diagram of a prior art hexagonal head bolt or nut with a lock washer anti-loosening structure.

Fig. 16 is a schematic diagram of a prior art structure for preventing local materials of threaded couplings from being plastically deformed and embedded in each other to prevent loosening.

Fig. 17 is a schematic diagram of a prior art anti-loosening structure for fixing the internal and external threads by means of an adhesive.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The first embodiment, referring to Figure 1, the anti-loosening connecting bolt includes a bolt 1 and a nut 2 connected with the joint surface part 3, characterized in that the joint end surface of the nut 2 and the joint surface part 3 is provided with at least one V Type groove 8; on the bolt between the nut and the connecting surface part 3 is also provided with a metal stop elastic piece 4; the side of the metal stop elastic piece 4 in contact with the connecting surface part 3 is provided with a stop boss 5; The surface part 3 is provided with a groove 6 which is matched with the stop boss 5; the side where the metal stop elastic piece 4 is in contact with the nut 2 is provided with a stop piece 7.

The V-shaped groove 8 is symmetrical in the center. Center symmetry refers to when the number of V-shaped grooves is two or more. A V-shaped groove 8 is provided on one end of the nut 2.

Referring to Fig. 4, the bolt 1 is replaced by a screw. The surface where the screw head contacts the joint surface part 3 is provided with a V-shaped groove 8, and the V-shaped groove 8 matches the upper stopper 7; metal The stop elastic piece 4 is arranged between the screw head and the joint surface part 3, and the metal stop elastic piece 4 is matched with the groove 6 provided on the joint surface part 3 through the stop boss 5 thereon.

The second embodiment, referring to Figures 2(a) to (d), the anti-loosening connecting bolt includes a bolt 1 and a nut 2 connected to the joint surface part 3. At least one bolt 1 is arranged symmetrically along the bolt axis in the radial direction of the body of the bolt 1 V-shaped groove 8; the threaded side of the nut 2 is provided with a metal stop elastic piece 4.

The metal stop elastic piece 4 is arranged on the thread side of the nut 2, indicating that the metal stop elastic piece 4 is a separate part, and the way of setting it on the thread side of the nut 2 is the same as the setting of the nylon ring of GB889.

The third embodiment, referring to Fig. 3(a)～(e), the anti-loosening connecting bolt includes a bolt 1 and a nut 2 connected with the joint surface part 3. The end surface of the bolt 1 is provided with a V-shaped groove 8; the nut 2 The side of the end face facing the bolt 1 is provided with a metal stop elastic piece 4; after the nut 1 rotates to determine the position, the stop piece 7 on the metal stop elastic piece 4 engages with the V-shaped groove 8.

The stop piece 7 on the metal stop elastic piece 4 is arranged on the end face side of the nut 2, as shown in Fig. 3(a). The metal stop elastic piece is a separate part, and the way of setting it on the thread side of the nut 2 is the same as the setting of the nylon ring of GB889.

The fourth embodiment, referring to Fig. 4, the anti-loosening connecting bolt includes a bolt 1 connected with the connecting surface part 3, characterized in that the contact surface between the connecting surface part 3 and the metal stop elastic piece 4 passes through the groove 6 and stops The bosses 5 are matched to be fixed; the brake pad 7 on the metal stop elastic piece 4 is nested and connected with the V-shaped groove 8 on the inner side of the bolt head 9.

The bolt 1 can be replaced by a screw.

The nut engages with the end surface of the joint surface part to prevent loosening.

The bolt and the nut radially engage and prevent loosening.

The bolt is engaged with the end face of the cap nut to prevent loosening.

The bolt or screw head engages with the end face of the joint surface part to prevent loosening.

The structural principle of the present invention is:

See Figure 1, embodiment 1, reliable thread anti-loosening device: including a nut with a certain angle of V-shaped groove (the number of grooves can be symmetrical, two or one), according to the need to prevent The requirement of looseness is determined, the more the number of grooves acting at the same time, the more reliable it is. The metal stop shrapnel with certain elasticity and mechanical strength should also have more than two sets of stop claws. One reason is to increase the number of times the shrapnel is used. Furthermore, it is conducive to the engagement with the nut (generally it is recommended to be staggered by 30°, the working "stop claw" and the position staggered by 30° are a set), the metal stop spring and the joint surface parts must adopt a reliable anti-corrosion Rotating structure, when the nut is tightened and in the proper position, the "metal stop shrapnel" will engage with the "V" groove on the nut under the action of elastic force, thereby preventing loosening and stopping effect. Moreover, this anti-rotation structure such as steps and holes also have the function of changing the original position, which indirectly increases the use times of the metal stopper shrapnel. If the metal stopper shrapnel is used with the V-groove on the bolt body to fix the nut It's also possible. During installation, it can be assembled and tightened as shown in the figure.

See Figure 2 (a) ~ (d), embodiment 2, reliable thread anti-loosening device: when the bolt and nut are used at the same time, the radial part of the bolt body (or thread) is machined symmetrically along the bolt axis (two Place or one) V-shaped groove with a certain angle, the angle range of the said V-shaped groove is 50°～75°, which is determined according to the requirements of anti-loosening, and the more grooves acting at the same time, the more reliable it is. The threaded side of the included nut is assembled with a metal stopper with a certain elasticity and mechanical strength. It should also have at least one set of stoppers or stop claws to facilitate engagement with the nut (generally recommended to be staggered by 30°, working stop The moving piece or the stop claw is a set with the position staggered by 30°). When the nut is tightened and in the proper position, the metal stop shrapnel will act on the elastic force and the V-shaped groove on the outer diameter of the bolt They are engaged to prevent loosening and stop. A reliable anti-rotation structure (that is, a combined nut) must be adopted between the metal stop elastic piece and the nut. The nut of this structure can be repeatedly disassembled and used with special tools, and can be assembled and tightened as shown in the figure during installation.

Referring to Figure 2(b), the metal stopper is an invisible part, and the stopper is a part of the specific shape formed by processing on the stopper.

Refer to Figure 3 (a) ~ (e), embodiment 3, when the bolt and the nut are used at the same time, symmetrically machined (two or one place) a certain angle "V" on the end surface of the body (or thread) of the bolt Type grooves are determined according to the requirements of anti-loosening. The more grooves that act at the same time, the more reliable it is. At the same time, the end face of the nut included is assembled with a metal stopper with a certain elasticity and mechanical strength. When the nut is tightened, And when in a proper position, the metal stop elastic piece will engage with the V-shaped groove on the outer diameter of the bolt under the action of elastic force, thereby playing the role of preventing loosening. A reliable anti-rotation structure (that is, a combined nut) must be adopted between the metal stop elastic piece and the nut. The nut of this structure can be repeatedly disassembled and used with special tools, and can be assembled and tightened as shown in the figure during installation. The angle of the V-shaped groove ranges from 50° to 75°.

See Figure 4, embodiment 4, thread anti-loosening device: when bolts or screw threads are used alone for fastening, they can be machined at the joint end surface of the bolt or screw head and other parts (several or two or One) V-shaped grooves with a certain angle are determined according to the requirements of anti-loosening. The more grooves that act at the same time, the more reliable it is. At the same time, it contains the corresponding elastic and mechanical strength metal stop at the joint surface. The movable shrapnel should also have more than two sets of stoppers or stop claws. One reason is to increase the number of times the shrapnel is used, and it is also conducive to the engagement with the nut (generally recommended to stagger by 30°, the working stop claws and It is a set that is offset by 30° from its position). A reliable anti-rotation structure must be adopted between the metal stop elastic piece and the joint surface parts. When the bolt or screw is tightened and in the proper position, the "metal stop elastic Under the action of elastic force, the piece will engage with the “V”-shaped groove on the bolt or screw to prevent loosening and stop. Furthermore, this anti-rotation structure such as steps and holes also have the function of changing the original position, which indirectly increases the use times of the metal stop elastic piece. During installation, it can be assembled and tightened as shown in the figure. The angle of the V-shaped groove ranges from 50° to 75°.

The working principle of the present invention is:

Refer to Figure 1 to Figure 2 (a) to (d), Figure 3 (a) to (e), Figure 4, when in use, all pass through the stopper on the metal stopper and the V-shaped groove on the bolt and nut Mutual meshing, so that the bolts and nuts, bolts and fastening parts, and nuts and fastening parts are reliably connected together in a mechanically fixed manner, so as to achieve the purpose of preventing loosening.

If one of them or a combination of two or more of the above solutions is included, it is also included in the scope of the present application.

The bolt 1 or the nut 2 are inlaid with a V-shaped groove and a metal stop elastic piece 4 to prevent loosening, which is different from the traditional mechanical anti-loosening purpose or the purpose of relying on friction to prevent loosening.

Claims

The anti-loosening connecting bolt includes a bolt (1) and a nut (2) connected to the joint surface part (3), and is characterized in that at least one joint end surface of the nut (2) and the joint surface part (3) is provided A V-shaped groove (8) at the location; a metal stop elastic piece (4) is provided between the nut and the joint surface part (3); the metal stop elastic piece (4) is provided on the side where it contacts the joint surface part (3) There is a stop boss (5); the joint surface part (3) is provided with a groove (6) that matches the stop boss (5); the metal stop spring (4) is in contact with the nut (2) A stop piece (7) is provided on one side.
The anti-loosening connecting bolt according to claim 1, wherein the V-shaped groove (8) is symmetrical in the center.
The anti-loosening connecting bolt according to claim 1, wherein one end surface of the nut (2) is provided with a V-shaped groove (8).
The anti-loosening connecting bolt according to claim 1, wherein the bolt (1) is replaced by a screw, and the surface of the screw head contacting the joint surface part (3) is provided with a V-shaped groove ( 8), the V-shaped groove (8) is matched with the upper stopper (7); the metal stopper shrapnel (4) is arranged between the screw head and the joint surface part (3), the metal stopper shrapnel (4) ) The stop boss (5) on it is matched with the groove (6) provided on the joint surface part (3).
The anti-loosening connecting bolt includes a bolt (1) and a nut (2) connected to the joint surface part (3), and is characterized in that at least one V-shaped bolt (1) is arranged symmetrically along the bolt axis in the radial direction of the bolt (1) body Groove (8); the threaded side of the nut (2) is provided with a metal stop elastic piece (4).
The anti-loosening connecting bolt includes a bolt (1) and a nut 2 connected to the joint surface part (3), and is characterized in that the end face of the bolt (1) is provided with a V-shaped groove (8); the nut (2) The side facing the end face of the bolt (1) is provided with a metal stop elastic piece (4); after the nut (1) is rotated to determine the position, the stop piece (7) and the V-shaped groove (8) on the metal stop elastic piece (4) ) Are engaged.
The anti-loosening connecting bolt according to claim 6, characterized in that the stop piece (7) on the metal stop elastic piece (4) is arranged on the end face side of the nut (2).
The anti-loosening connecting bolt includes a bolt (1) connected to the joint surface part (3), characterized in that the contact surface of the joint surface part (3) and the metal stop elastic piece (4) passes through the groove (6), The stop boss (5) is matched and fixed; the brake piece (7) on the metal stop elastic piece (4) is nestedly connected with the V-shaped groove (8) on the inner surface of the bolt head (9).
The anti-loosening connecting bolt according to claim 8, wherein the bolt (1) can be replaced by a screw.