CN109114092B - Anti-loosening and retaining nut - Google Patents
Anti-loosening and retaining nut Download PDFInfo
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- CN109114092B CN109114092B CN201811226072.2A CN201811226072A CN109114092B CN 109114092 B CN109114092 B CN 109114092B CN 201811226072 A CN201811226072 A CN 201811226072A CN 109114092 B CN109114092 B CN 109114092B
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- washer
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- thread
- locking
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- 230000002265 prevention Effects 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 8
- 230000005489 elastic deformation Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
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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
- F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
- F16B39/108—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking washer under the nut or bolt head having at least one tongue or lug folded against the nut or bolt head, or against the object itself
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
The invention relates to a locking and retaining nut, and belongs to the technical field of fasteners. The stop washer can radially contract inwards, and drives the internal teeth of the threads to be pressed into the tooth bottom of the external threads of the bolt to stop relative to the bolt; the stop washer generates and maintains radial pretightening force relative to the bolt, is not influenced by impact, vibration or variable load, and is reliable in looseness prevention and backstopping. When the axial pretightening force is reduced and disappears, the locking state of the locking washer cannot be influenced, the locking washer can be prevented from falling off from the connected piece, and accidents are prevented from being caused. When the bolt is assembled and disassembled, the external threads of the bolt can be deformed and also can be shaped, the thread pair is not damaged, the bolt can be repeatedly used, and the connection strength and the rigidity are not reduced. The limiting washer and the stop washer can share the axial load of the main nut, and are high in reliability and long in service life. The locking washer and the stop washer are abutted through the radial convex marks and the radial concave marks, so that relative rotation can be avoided, and the assembly and disassembly operation is easy.
Description
Technical Field
The invention relates to a nut, in particular to a locknut, and belongs to the technical field of fasteners.
Background
The nut is usually in a flat hexagonal cylindrical structure and is provided with a central threaded hole, and the inner surface of the central threaded hole is provided with internal threads which are matched with the bolt and used for fastening and connecting two connected pieces with through holes. The bolt consists of a head and a screw; the screw rod is provided with an external thread and is matched with the internal thread of the nut through the external thread.
Under the action of impact, vibration or variable load, the connection between the nut and the bolt can be loosened and even completely separated, and accidents are easily caused. The current anti-loosening measures can be divided into three types, namely friction anti-loosening, mechanical anti-loosening and thread pair anti-loosening damage. (1) The friction anti-loosening is to increase the pressure and the friction force between the thread pairs so as to prevent relative rotation; for example, a counter nut, a self-locking nut, or a spring washer, and may also change thread parameters. Because the materials of the threaded connecting piece and the connected piece can generate creep and stress relaxation, the pretightening force and the friction force are reduced, and the anti-loosening effect is lost, so the reliability of friction anti-loosening is lower. (2) Mechanical anti-loosening is achieved by constraining the thread pairs with a stop element, such as a cotter pin, a tandem wire, a set screw, or a stop washer. The mechanical anti-loosening needs to be processed with an anti-loosening structure matched with a stopping element in advance on a threaded connecting piece, and the strength and the rigidity of threaded connection are influenced. Due to the existence of machining errors, a gap exists between the stop element and the anti-loosening structure, anti-loosening pre-tightening force does not exist, and the stop element can stop after the pre-tightening force of threaded connection is reduced and even loosened; thus, strictly speaking: the mechanical anti-loosening function only has a backstop function, and the anti-loosening function is insufficient. (3) The anti-loosening of the thread pair is broken, the thread pair is converted into a non-kinematic pair, and the possibility of relative rotation is eliminated, such as welding, riveting, punching or bonding; the anti-loosening of the damaged thread pair is convenient and reliable, the defect is that the thread connection is changed into the non-detachable connection, the breaking and the disassembling are difficult, and the bolt and the nut can be used only once.
In the prior art, utility model patent No. 201820006198.8 proposes a lock washer, which comprises an annular washer base body and a pressing sheet which are integrally pressed and formed; the pressing sheets are uniformly distributed at intervals along the circumference of the gasket base body, and the gasket base body respectively corresponds to the openings formed in one side of the inner edge of each pressing sheet; the pressing sheet is bent and protruded towards one side, can prop against the bolt to prevent loosening when being pressed, and has an elastic anti-loosening effect. In the technical scheme described in this patent, the preforming produces axial and radial extrusion to the bolt, and the extrusion size is uncontrollable, has the not enough of destroying bolt external screw thread and threaded connection dismantlement difficulty. The invention patent with the application number of 201710704182.4 provides a check bolt, wherein a gasket is sleeved on the bolt, and a cutting groove which penetrates through the side surface of the bolt along the length direction of the bolt is arranged on the thread section of the bolt; the gasket is provided with an inverted cone matched with the cutting groove. According to the technical scheme, a locking measure that an inverted cone is matched with a bolt cutting groove is utilized, the locking device belongs to mechanical locking, and the defects of affecting the strength and rigidity of threaded connection exist; in addition, when the nut is installed, the back taper body of the gasket is driven to gradually move towards the inner side of the cutting groove along with the axial movement of the nut along the bolt, so that the thread section of the bolt is expanded, and the nut is effectively prevented from loosening; however, when the gasket is disassembled, the back taper body of the gasket generates axial self-locking, and the defect of difficult disassembly exists.
The failure modes of the threaded connection mainly comprise bolt breaking, shearing, thread deformation and thread slipping; the probability that the thread deformation occurs on the bolt is greater than that on the nut; the bolt is broken on the screw rod, and the probability of the position close to the nut by the connecting piece is high. Because the nut is internal thread, the screw thread of nut is located the radial outside of cooperation bolt, and is bigger than the cooperation screw thread length of bolt, therefore the screw thread of bolt is more damaged, causes threaded connection failure.
Disclosure of Invention
The invention aims to provide an anti-loosening and retaining nut which is matched with a bolt to fasten a connected piece, can be repeatedly assembled and disassembled, can prevent loosening and retain, has reliable anti-loosening and retaining effects and does not reduce the strength and rigidity of threaded connection. The orientation stated in the specification takes the matching thread of the invention and the bolt as a reference, the axial direction of the matching thread is axial, and the diameter direction is radial; the direction away from the connected member is far, and vice versa, and so on. The specific technical scheme of the invention is as follows.
A locknut comprises a main nut 1, a limit washer 2, a stop washer 3, a lock washer 4 and an auxiliary nut 5, as shown in figure 1. The main nut 1 and the auxiliary nut 5 both have hexagonal cylindrical structures and are provided with central threaded holes, internal threads are formed in the inner surfaces of the central threaded holes, and the internal threads are matched with external threads of bolts.
Further, main nut 1 is in the near-end face with by the connecting piece butt, at distal end face in proper order with spacing washer 2 and lock washer 3 fixed connection, with the external screw thread fit of bolt to but relative bolt rotation produces axial displacement and axial pretightning force, makes by the connecting piece obtain detachable threaded connection, locking and stopping are reliable, do not reduce threaded connection's intensity and rigidity.
Furthermore, the hardness of the limiting washer 2, the stop washer 3 and the lock washer 4 is higher than that of the bolt, the main nut 1 and the auxiliary nut 5, so that the external threads of the extruded bolt can be deformed.
Furthermore, the limiting washer 2 is of a circular ring-shaped sheet structure and is matched with the external thread of the bolt, so that the axial position of the stop washer 3 can be limited, the deformed external thread of the bolt can be shaped, and the damage to the internal thread of the main nut 1 is avoided.
Furthermore, the stop washer 3 is of a circular ring-shaped curved surface sheet structure, is abutted against the locking washer 4 on the far end surface, can radially contract inwards when being extruded by the locking washer 4, is pressed into the tooth bottom of the external thread of the bolt, is stopped relative to the bolt, and is reliable in looseness prevention and backstopping.
Furthermore, the locking washer 4 is of a circular ring-shaped sheet structure and is matched with the external thread of the bolt, so that the deformed external thread of the bolt can be shaped, and the damage to the internal thread of the auxiliary nut 5 is avoided.
Further, the secondary nut 5 is fixedly connected with the locking washer 4 at the proximal end face, and can drive the locking washer 4 to rotate relative to the external thread of the bolt, axially press the stop washer 3, so that the stop washer 3 is stopped relative to the bolt, and lock the stop washer 3, so that the radial pretightening force is generated and maintained by the stop washer 3 relative to the bolt.
The main nut 1 can rotate relative to the external thread of the bolt to generate axial movement and axial pretightening force so as to fasten a connected piece. Main nut 1 has chute 11 at the distal end of side, through chute 11 and spacing washer 2 and lock washer 3 joint, avoid spacing washer 2 and lock washer 3 to rotate 1 main nut relatively. Two side surfaces of the inclined groove 11 are vertical to the side surfaces of the main nut 1, and the bottom surface is inclined relative to the side surfaces of the main nut 1 and is deepest at the far end.
The limiting washer 2 is a circular ring-shaped sheet structure and is provided with a central hole, a near folding fin 21, a thread part 22, an inner groove 23 and an outer groove 24, as shown in fig. 2, the near end surface is fixedly connected with the far end surface of the main nut 1, the far end surface is fixedly connected with the stop washer 3, the thread part 22 is matched with the external thread of the bolt to limit the axial position of the stop washer 3, the deformed external thread of the bolt can be shaped, and the internal thread of the main nut 1 is prevented from being damaged.
The near-folding wing pieces 21 are of flat strip-shaped structures, are bent towards the near ends and are clamped into the inclined grooves 11 of the main nut 1, and rotation relative to the main nut 1 is avoided.
The threaded part 22 surrounds the central hole of the limit washer 2, and the inner surface of the central hole is provided with at least one circle of internal threads; the internal thread is the same with the internal thread structure of main nut 1, with the external screw thread cooperation of bolt, can avoid damaging the internal thread of main nut 1 with the shaping of the bolt external screw thread that takes place to warp.
The inner groove 23 extends along the radial direction, penetrates through the thread part 22 from inside to outside, is uniformly distributed along the inner circumference of the central hole of the limiting gasket 2, and uniformly divides the thread part 22, so that the thread part 22 can shape the deformed external thread of the bolt conveniently.
The outer groove 24 is located on the outer circumferential surface of the limiting gasket 2, extends inwards along the radial direction, and is clamped with the stop gasket 3 to avoid relative rotation.
Curved surface ring portion 31 is ring shape curved surface sheet structure, encircles the centre bore of lock washer 3, and with the centre bore is concentric, and the near-end face is concave curved surface, and the distal end face is convex curved surface, and at distal end face and 4 butts of lock washer, when receiving 4 extrudions of lock washer, elastic deformation can take place, radially contracts inwards. The concave curved surface is parallel to the convex curved surface.
The radial indents 32 extend from inside to outside along the radial direction, have the same depth of inner and outer recesses, and are uniformly distributed on the distal end surface of the curved ring part 31 along the circumference, so that the friction force between the annular body and the lock washer 4 can be increased, and the relative rotation can be avoided.
The thread internal teeth 33 are positioned on the inner surface of the central hole of the stop washer 3 and are a circle of internal threads; the internal thread has the same structure as the internal thread of the main nut 1; the internal thread is uniformly divided along the circumferential direction by two radial internal grooves with different depths to form internal teeth; when the curved ring portion 31 is pressed by the lock washer 4 and radially inwardly contracted, the internal teeth can be pressed into the root of the external thread of the bolt, so that the lock washer 3 is locked with respect to the bolt. The deeper of the radially inner grooves extends radially from the crest of the internal thread to the root; the shallower of the radially inner grooves extends radially from the crest of the internal thread to less than the root.
The retraction groove 34 extends radially outward from the inner surface of the center hole of the lock washer 3, penetrates the curved ring portion 31, and uniformly divides the curved ring portion 31 along the inner circumferential direction, so that the curved ring portion 31 is elastically deformed and retracted radially inward when being pressed by the lock washer 4, and the internal teeth 33 of the driving thread are pressed into the bottom of the external thread of the bolt.
The fin 35 is a flat strip-shaped structure, is bent towards the near end, is clamped into the outer groove 24 of the limiting washer 2 and the chute 11 of the main nut 1, and avoids the rotation of the limiting washer 2 and the main nut 1 relatively, so that the main nut 1 can be locked relatively to the bolt, and the main nut 1 can prevent looseness and stop.
The locking washer 4 is a circular ring-shaped sheet structure and is provided with a central hole, a far folding wing 41, a thread part 42, a dividing groove 43 and a radial convex mark 44, as shown in fig. 4, the locking washer is fixedly connected with the auxiliary nut 5 on the far end surface and is abutted against the stop washer 3 on the near end surface, the stop washer 3 can be extruded, the stop washer 3 is enabled to be stopped relative to the bolt, the stop washer 3 is locked, the stop washer 3 generates and maintains radial pretightening force relative to the bolt, the stop state is maintained, and the locking and the stopping are reliable.
The far folding fin 41 is of a flat strip structure, is bent towards the far end and is clamped with the auxiliary nut 5, and rotation of the auxiliary nut 5 relative to the far folding fin is avoided.
Said threaded portion 42 surrounds the central hole of the lock washer 4, with at least one internal thread on the inner surface of said central hole; the internal thread is the same as the internal thread structure of the auxiliary nut 5 and is matched with the external thread of the bolt, so that the deformed external thread of the bolt can be shaped, and the damage to the internal thread of the auxiliary nut 5 is avoided.
The dividing grooves 43 extend in the radial direction, penetrate through the threaded portion 42 from the inside to the outside, are uniformly distributed along the inner circumference of the central hole of the lock washer 4, and divide the threaded portion 42 uniformly, so that the threaded portion 42 shapes the deformed external thread of the bolt, and the damage to the internal thread of the auxiliary nut 5 is avoided.
The radial convex marks 44 extend from inside to outside along the radial direction, have the same height of the inner convex and the outer convex, are uniformly distributed on the near end surface of the locking washer 4 along the circumference and are abutted to the radial dents 32 of the stop washer 3, so that the friction force between the stop washer 3 and the stop washer can be increased, the relative rotation can be avoided, the stop washer 3 can be locked, the radial pretightening force is generated and kept relative to the bolt, the stop state is kept, and the looseness prevention and the retreat prevention are reliable.
The auxiliary nut 5 is fixedly connected with the locking washer 4 on the proximal end face, and can drive the locking washer 4 to rotate relative to the external thread of the bolt, axially press the stop washer 3, so that the stop washer 3 is stopped relative to the bolt, and the stop washer 3 is locked, so that the stop washer 3 generates and maintains radial pretightening force relative to the bolt to maintain a stopping state, and the locking and stopping are reliable.
Further, the internal thread of the auxiliary nut 5 has the same structure as the internal thread of the main nut 1; the axial length of the auxiliary nut 5 is smaller than that of the main nut 1.
Further, the secondary nut 5 is provided with a tapered slot 51 at the proximal end of the side surface, and the tapered slot 51 is clamped with the far folding wing 41 of the lock washer 4, so that the lock washer 4 is prevented from rotating relative to the secondary nut 5, and the lock washer 4 can be driven to rotate. The two side surfaces of the inclined groove 51 are perpendicular to the side surfaces of the secondary nut 5, and the bottom surface is inclined relative to the side surfaces of the secondary nut 5 and is deepest at the proximal end.
Supplementary explanation: (1) the main nut 1 of the invention is abutted against the connected piece at the near end surface and is fixedly connected with the limit washer 2 and the stop washer 3 at the far end surface in sequence; the far end of the bolt at the part matched with the main nut 1 is a free end; the free end of the bolt is in a fastening state and does not bear axial tensile acting force; therefore, the internal thread teeth 33 of the lock washer 3 are pressed into the root of the external thread of the bolt at the free end of the bolt, and the strength and rigidity of the threaded connection are not reduced.
(2) When the axial pretightening force of the bolt is reduced or disappears due to creep and stress relaxation of the materials of the bolt and the connected piece or other structural changes, the connected piece is loosened without influencing the locking state of the locking washer 3 relative to the bolt; at the moment, the invention has the function of backstop, and the backstop function is reliable.
(3) When the connected piece is loosened, the auxiliary nut 5 can be firstly reversed by a wrench, so that the stop washer 3 is withdrawn from the stop state; then screwing the main nut 1 to enable the bolt connection to generate enough axial pretightening force so that the connected piece is fastened; finally, the secondary nut 5 is tightened so that the locking washer 3 enters the locking state. In the process of screwing the auxiliary nut 5, the locking washer 4 can shape the deformed bolt external thread through the deformed part of the bolt external thread, so that the damage to the internal thread of the auxiliary nut 5 is avoided.
(4) When the threaded connection is disassembled, the auxiliary nut 5 can be reversely rotated by a wrench, so that the stop washer 3 is withdrawn from the stop state; and then the main nut 1 is reversed by a spanner, so that the connected piece is withdrawn from the threaded connection. When the main nut 1 is rotated reversely, the limiting washer 2 can reshape the deformed bolt external thread through the deformed part of the bolt external thread, and the damage to the internal thread of the main nut 1 is avoided.
(5) When the auxiliary nut 5 is screwed by a spanner to drive the stop washer 3 to enter a stop state, the screwing force is amplified by the spanner, and is converted into axial pressing force through thread rotation to be amplified for the second time; then the elastic deformation of the curved surface ring part 31 of the stop washer 3 is converted into radial pressure, and the radial pressure is amplified for the third time; therefore, the operation of attaching and detaching the sub nut 5 is easy, and excessive force is not necessary.
(6) The main nut 1 and the auxiliary nut 5 of the invention cannot be reversely mounted far and near and cannot be reversely mounted far and near; when the stop washer 3 is in a stop state, the main nut 1 cannot be screwed; otherwise the external thread of the bolt would be damaged.
(7) After being disassembled, the bolt matched with the invention can not reduce the connection strength and rigidity when being used for connecting a connected piece with smaller thickness, and can be repeatedly used. The invention can be repeatedly used, and the strength and the rigidity of the connection can not be influenced.
The invention has the following beneficial effects: (1) when the stop washer 3 is extruded by the locking washer 4, the stop washer can radially contract inwards, the internal teeth 33 of the driving thread are pressed into the tooth bottom of the external thread of the bolt, and the stop washer stops relative to the bolt, so that the locking and stopping are reliable; due to the axial pressing force of the lock washer 4 on the lock washer 3, the curved ring part 31 of the lock washer 3 generates elastic deformation and is converted into amplified radial pressure, the thread internal teeth 33 are driven to be pressed into the tooth bottoms of the bolt external threads, and therefore radial contact stress, namely radial pre-tightening force exists between the thread internal teeth 33 and the deformed bolt external threads of the lock washer 3 in a locking state.
Because the thread internal teeth 33 are pressed into the bottom of the bolt external thread, the bolt external thread deforms to obtain the surface shape which is completely the same as that of the thread internal teeth 33 at the contact part, no gap exists between the bolt external thread and the contact part of the thread internal teeth 33, the stop washer 3 can be effectively prevented from rotating relative to the bolt external thread, and the stop is reliable in forward rotation and reverse rotation.
Compared with the existing mechanical anti-loosening technology, under the action of impact, vibration or variable load, the anti-loosening structure of the invention can not cause the reduction and loosening of the pretightening force of threaded connection because of the gap between the stop element and the anti-loosening structure and no pretightening force.
(2) The invention depends on the thread internal teeth 33 of the stop washer 3 to press in the thread bottom of the bolt external thread to prevent looseness and stop. The radial pre-tightening force between the thread internal teeth 33 and the contact part of the bolt external thread is determined by the pressing force between the stop washer 3 and the lock washer 4 and is independent of the axial pre-tightening force of the threaded connection. Therefore, the impact, vibration or variable load action on the threaded connection cannot cause the radial pretightening force to change, and the anti-loosening and retaining action of the invention cannot be influenced. Even if the axial pretightening force of the threaded connection is reduced and disappears, and the threaded connection is loosened, the radial pretightening force of the invention is still kept, and the locking state of the locking washer 3 is not influenced; therefore, compared with the existing anti-loosening and retaining technologies, the anti-loosening and retaining effect of the invention is more reliable, and the bolt and the nut can be effectively prevented from falling off from the connected piece, thereby preventing accidents.
(3) When the bolt is connected with a bolt for assembly and disassembly, the external thread of the bolt can be deformed, and the deformed external thread of the bolt can be shaped, so that the internal thread of the bolt is prevented from being damaged; therefore, the invention can be repeatedly used without reducing the connection strength and rigidity; after being disassembled, the bolt matched with the invention can not reduce the connection strength and rigidity when being used for connecting a connected piece with smaller thickness, and can be repeatedly used. Therefore, compared with the prior anti-loosening and retaining technology, the technical scheme of the invention does not damage the thread pair and can be repeatedly used for multiple times.
(4) The main nut 1 of the invention is abutted against the connected piece at the near end surface and is fixedly connected with the limit washer 2 and the stop washer 3 at the far end surface in sequence; the hardness of the limiting washer 2 and the stop washer 3 is higher than that of the bolt and the main nut 1; the limiting washer 2 and the stop washer 3 are matched with the external thread of the bolt; therefore, compared with the existing nut, the main nut 1, the limiting washer 2 and the stop washer 3 are high in overall strength and rigidity, the limiting washer 2 and the stop washer 3 can share the axial load of the main nut 1, abrasion, fatigue, tooth slipping and other failures of the main nut 1 can be effectively avoided, the reliability is high, and the service life is long.
(5) The stop washer 3 of the present invention has radial indents 32 uniformly distributed along the circumference on the distal end surface of the curved ring portion 31, and the lock washer 4 has radial convex marks 44 uniformly distributed along the circumference on the proximal end surface; the locking washer 4 and the stop washer 3 are respectively abutted with the radial dent 32 through the radial convex marks 44, so that friction force can be increased, relative rotation is avoided, the stop washer 3 is locked, radial pretightening force is generated and kept on the stop washer 3 relative to the bolt, a stop state is kept, and looseness prevention and stopping are reliable.
(6) When the auxiliary nut 5 is tightened by a spanner to drive the stop washer 3 to enter a stop state, the tightening force is amplified for three times; therefore, the operation of attaching and detaching the sub nut 5 is easy, and excessive force is not necessary.
Drawings
FIG. 1 is a front view of the present invention;
fig. 2 is a left side view of the spacing washer 2 in fig. 1;
FIG. 3 is a left side view of a stop washer 3 in FIG. 1;
fig. 4 is a left side view of the lock washer 4 in fig. 1.
Description of reference numerals: the main nut 1, the inclined groove 11, the limit washer 2, the proximal flap piece 21, the threaded portion 22, the inner groove 23, the outer groove 24, the stopper washer 3, the curved ring portion 31, the radial indentation 32, the threaded inner teeth 33, the inner retracted groove 34, the tab 35, the lock washer 4, the distal flap piece 41, the threaded portion 42, the dividing groove 43, the radial convex mark 44, the sub nut 5, and the inclined groove 51.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Fig. 1 is a front view of the present invention, comprising a main nut 1, a spacing washer 2, a stop washer 3, a lock washer 4 and a sub-nut 5. The screw fitting according to the invention is preferably a known screw standard.
The nut 1 and the auxiliary nut 5 are both of a hexagonal cylindrical structure and provided with a central threaded hole, the inner surface of the central threaded hole is provided with internal threads, preferably a carbon steel wire, and the nut is processed and formed through processes of blanking, cold heading, heat treatment, tapping, surface treatment and the like. The angled slot 11 at the distal end of the side of the nut 1 and the angled slot 51 at the proximal end of the side of the secondary nut 5 are preferably milled.
The limiting washer 2, the stop washer 3 and the lock washer 4 are all preferably made of spring steel plates and are processed and formed through the processes of blanking, annealing, stamping, end surface grinding, deburring, quenching, tempering and the like.
Fig. 2 is a left side view of the spacing washer 2 in fig. 1; the limiting washer 2 is of a circular ring-shaped sheet structure and is provided with a central hole, a near folding fin 21, a threaded part 22, an inner groove 23 and an outer groove 24. The fixed connection of the stop washer 2 at the proximal face to the distal face of the main nut 1 is preferably bonded by a known metal adhesive. The proximal tabs 21 are bent proximally to snap into the angled slots 11 of the main nut 1 and are preferably bonded to the angled slots 11 of the main nut 1 by a known metallic adhesive. The threaded portion 22 surrounds the central hole of the spacing washer 2, and the inner surface of the central hole is provided with at least one circle of internal threads, preferably one circle of internal threads; the internal thread is preferably formed by grinding.
FIG. 3 is a left side view of a stop washer 3 in FIG. 1; the stop washer 3 is a circular ring-shaped curved surface sheet-shaped structure and is provided with a central hole, a curved surface ring part 31, a radial dent 32, a thread internal tooth 33, an internal shrinkage groove 34 and a wing piece 35. The stop washer 3 is fixedly connected to the stop washer 2 at its proximal face, preferably by means of a known metal adhesive. The radial indentations 32 extend radially from the inside to the outside, are recessed to the same depth, and are preferably formed by grinding.
The thread internal teeth 33 are positioned on the inner surface of the central hole of the stop washer 3 and are a circle of internal threads; the internal thread is uniformly divided along the circumferential direction by two radial internal grooves with different depths to form internal teeth; the internal thread is preferably formed by grinding; the radial inner grooves are preferably formed by grinding.
The tabs 35 are bent proximally to snap into the outer groove 24 of the spacing washer 2 and the angled slots 11 of the main nut 1 and are preferably bonded to the outer groove 24 of the spacing washer 2 and the angled slots 11 of the main nut 1 by a known metal adhesive.
Fig. 4 is a left side view of the lock washer 4 in fig. 1; the lock washer 4 has a circular plate-like structure with a central hole, a distal flap 41, a threaded portion 42, a dividing groove 43 and a radial projection 44. The lock washer 4 is fixedly connected at its distal end face to the secondary nut 5, preferably by means of a known metal adhesive.
The distal folding fin 41 has a flat strip-shaped structure, is bent toward the distal end, is caught in the inclined groove 51 of the sub-nut 5, and is preferably bonded to the inclined groove 51 of the sub-nut 5 by a known metal adhesive. Said threaded portion 42 surrounds the central hole of the lock washer 4, with at least one internal thread, preferably one, on the inner surface of said central hole; the internal thread is preferably formed by grinding.
The above embodiments are merely preferred embodiments of the present invention, and are not to be construed as limiting the present invention. It is within the scope of the present invention to modify the materials and fabrication processes while still meeting the structural and performance requirements of the present invention.
Claims (6)
1. The utility model provides a locking stopping nut which characterized in that: comprises a main nut (1), a limit washer (2), a stop washer (3), a locking washer (4) and an auxiliary nut (5),
when the bolt is connected with the bolt for assembly and disassembly, the external thread of the bolt can be deformed, and the deformed external thread of the bolt can be shaped, so that the damage is avoided, and the bolt can be repeatedly used;
the main nut (1) and the auxiliary nut (5) both have hexagonal cylindrical structures and are provided with central threaded holes and internal threads; the main nut (1) is abutted against the connected piece at the near end surface, is fixedly connected with the limiting washer (2) and the stop washer (3) in sequence at the far end surface, and is matched with the external thread of the bolt, so that the connected piece is in detachable threaded connection, the locking and stopping are reliable, and the strength and the rigidity of the threaded connection are not reduced;
the hardness of the limiting washer (2), the stop washer (3) and the locking washer (4) is higher than that of the bolt, the main nut (1) and the auxiliary nut (5), so that the external thread of the extruded bolt can be deformed;
the limiting washer (2) is of a circular ring-shaped sheet structure and is matched with the external thread of the bolt, the axial position of the stop washer (3) can be limited, the deformed external thread of the bolt can be shaped, and the internal thread of the main nut (1) is prevented from being damaged;
the stop washer (3) is of a circular ring-shaped curved surface sheet structure, is abutted against the locking washer (4) on the far end surface, can radially retract inwards, is pressed into the tooth bottom of the external thread of the bolt, stops relative to the bolt, and is reliable in looseness prevention and backstopping;
the stop washer (3) is provided with a thread internal tooth (33);
the thread internal teeth (33) of the stop washer (3) are pressed into the tooth bottom of the external thread of the bolt and positioned at the free end of the bolt, so that the strength of threaded connection cannot be reduced;
the internal thread (33) is pressed into the bottom of the external thread of the bolt, so that the external thread of the bolt deforms to obtain the surface shape which is completely the same as that of the internal thread (33) at the contact part, no gap exists between the internal thread (33) and the contact part, the stop washer (3) can be effectively prevented from rotating relative to the external thread of the bolt, and the stop is reliable in both forward rotation and reverse rotation;
the stop washer (3) in a stop state has radial pre-tightening force between the thread internal teeth (33) and the deformed bolt external threads;
the radial pretightening force between the contact part of the internal thread teeth (33) and the external thread of the bolt is determined by the pressing force between the stop washer (3) and the locking washer (4) and is irrelevant to the axial pretightening force of threaded connection;
even if the threaded connection is loosened, the radial pretightening force is still kept, and the locking state of the locking washer (3) cannot be influenced;
the limiting washer (2) and the stop washer (3) can share the axial load of the main nut (1);
the locking washer (4) is of a circular ring-shaped sheet structure and is matched with the external thread of the bolt, so that the deformed external thread of the bolt can be shaped, and the damage to the internal thread of the auxiliary nut (5) is avoided;
the auxiliary nut (5) is fixedly connected with the locking washer (4) on the near end surface, the locking washer (4) can be driven to rotate, the stop washer (3) is axially pressed, the stop washer (3) is driven to stop relative to the bolt, and the stop washer (3) is locked, so that the stop washer (3) generates and maintains radial pretightening force relative to the bolt;
when the connected piece is loosened, the auxiliary nut (5) can be reversed firstly, so that the stop washer (3) is withdrawn from the stop state; then the main nut (1) is screwed down to enable the connected piece to be fastened; and finally, screwing the auxiliary nut (5) to enable the stop washer (3) to enter a stop state, and shaping the deformed external thread of the bolt through the deformed part of the external thread of the bolt by the locking washer (4).
2. A locknut as claimed in claim 1, wherein: main nut (1) has chute (11) in the distal end of side, through chute (11) and spacing washer (2) and lock washer (3) joint avoid spacing washer (2) and lock washer (3) to rotate main nut (1) relatively.
3. A locknut as claimed in claim 1, wherein: the limiting washer (2) is provided with a central hole, a near folding wing piece (21), a thread part (22), an inner groove (23) and an outer groove (24);
the near-folding wing pieces (21) are of flat strip structures, are bent towards the near ends, and are clamped into the inclined grooves (11) of the main nut (1);
the threaded part (22) surrounds a central hole of the limiting washer (2), and the inner surface of the central hole is provided with at least one circle of internal threads; the internal thread is matched with the external thread of the bolt, so that the deformed external thread of the bolt can be shaped;
the inner groove (23) extends along the radial direction, penetrates through the threaded part (22) from inside to outside, and uniformly divides the threaded part (22) so that the threaded part (22) can shape the deformed external thread of the bolt conveniently;
the outer groove (24) is located on the outer circumferential surface of the limiting gasket (2) and extends inwards along the radial direction.
4. A locknut as claimed in claim 1, wherein: the stop washer (3) is provided with a central hole, a curved ring part (31), a radial dent (32), an inner shrinkage groove (34) and a wing piece (35);
the curved surface ring part (31) is of a circular ring-shaped curved surface sheet structure, surrounds a central hole of the stop washer (3), is a concave curved surface at the near end surface, is a convex curved surface at the far end surface, is abutted against the locking washer (4), and can generate elastic deformation and radially retract when being extruded by the locking washer (4);
the radial dents (32) extend from inside to outside along the radial direction and are uniformly distributed on the far end surface of the curved ring part (31) along the circumference;
the thread internal teeth (33) are positioned on the inner surface of the central hole of the stop washer (3) and are a circle of internal threads; the internal thread is uniformly divided along the circumferential direction by a radial internal groove to form internal teeth; the internal teeth can be pressed into the tooth bottoms of the external threads of the bolt, so that the stop washer (3) is stopped relative to the bolt;
the inner shrinkage groove (34) extends outwards along the radial direction from the inner surface of the central hole of the stop washer (3), the curved surface ring part (31) is uniformly divided along the inner circumferential direction, the curved surface ring part (31) is convenient to shrink inwards along the radial direction, and the internal teeth (33) of the driving thread are pressed into the tooth bottom of the external thread of the bolt;
fin (35) are flat bar structure, bend to the near-end, go into outer groove (24) of spacing washer (2) and chute (11) of main nut (1) in the card, avoid relative spacing washer (2) and main nut (1) to rotate for main nut (1) can locking and stopping.
5. A locknut as claimed in claim 1, wherein: the locking washer (4) is provided with a central hole, a far folding wing piece (41), a thread part (42), a dividing groove (43) and a radial convex mark (44);
the far folding wing pieces (41) are of flat strip structures, are bent towards far ends and are clamped with the auxiliary nuts (5) to avoid rotating relative to the auxiliary nuts (5);
the threaded part (42) surrounds a central hole of the locking washer (4), and the inner surface of the central hole is provided with at least one circle of internal threads; the internal thread is matched with the external thread of the bolt, so that the deformed external thread of the bolt can be shaped, and the internal thread of the auxiliary nut (5) is prevented from being damaged;
the dividing groove (43) extends along the radial direction, penetrates through the threaded part (42) from inside to outside, and divides the threaded part (42) uniformly, so that the threaded part (42) shapes deformed external threads of the bolt conveniently;
the radial convex marks (44) extend from inside to outside along the radial direction, are uniformly distributed on the near end face of the locking washer (4) along the circumference and are abutted against the radial dents (32) of the stop washer (3), so that the friction force between the radial convex marks and the stop washer (3) can be increased, relative rotation can be avoided, the stop washer (3) can be locked, the radial pretightening force generated by the stop washer (3) relative to the bolt can be kept, the stop state can be kept, and the anti-loosening and anti-backing are reliable.
6. A locknut as claimed in claim 1, wherein: the auxiliary nut (5) is provided with a chute (51) at the near end of the side surface, and the chute (51) is clamped with the far folding wing piece (41) of the locking washer (4) to drive the locking washer (4) to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226072.2A CN109114092B (en) | 2018-10-22 | 2018-10-22 | Anti-loosening and retaining nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226072.2A CN109114092B (en) | 2018-10-22 | 2018-10-22 | Anti-loosening and retaining nut |
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| Publication Number | Publication Date |
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| CN109114092A CN109114092A (en) | 2019-01-01 |
| CN109114092B true CN109114092B (en) | 2020-08-11 |
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| CN201811226072.2A Active CN109114092B (en) | 2018-10-22 | 2018-10-22 | Anti-loosening and retaining nut |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110185692B (en) * | 2019-07-02 | 2023-12-19 | 海盐县华昇汽车配件有限公司 | Extrusion type slotting lock nut |
| CN110985550A (en) * | 2019-12-23 | 2020-04-10 | 中国航发哈尔滨轴承有限公司 | Anti-loosening assembly for preventing bearing from moving |
| CN113074178B (en) * | 2021-05-06 | 2022-09-30 | 嘉兴京凯云德信息技术有限公司 | Locknut and preparation method thereof |
| CN113187797B (en) * | 2021-05-24 | 2022-12-20 | 鲁东大学 | Reliable locknut for transmission line tower and electric power fitting |
| CN113915221A (en) * | 2021-09-30 | 2022-01-11 | 庆安集团有限公司 | Anti-loosening screw assembly and using method thereof |
| CN114658741A (en) * | 2022-03-28 | 2022-06-24 | 福建省晋江市励精汽配有限公司 | Check bolt and check nut |
| CN114909384A (en) * | 2022-07-04 | 2022-08-16 | 河南能驰电源有限公司 | Locking structure used between screw and nut |
| CN115126760A (en) * | 2022-07-14 | 2022-09-30 | 河南航天精工制造有限公司 | Check bolt assembly |
| CN116581623B (en) * | 2023-05-31 | 2024-02-02 | 安费诺高速技术(南通)有限公司 | Machining and assembling method of anti-withdrawal connector assembly |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2226168Y (en) * | 1995-05-09 | 1996-05-01 | 周勇 | Self-locking bolt assembly |
| US6010290A (en) * | 1999-01-29 | 2000-01-04 | Dana Corporation | Lock nut washer for a locking nut assembly |
| US6976816B2 (en) * | 2003-08-01 | 2005-12-20 | Dana Corporation | Combination lock washer and spindle bearing assembly |
| CN105889279A (en) * | 2014-11-30 | 2016-08-24 | 仇海侠 | Combined locknut |
| CN204387071U (en) * | 2014-12-04 | 2015-06-10 | 上海底特精密紧固件股份有限公司 | A kind of lock nut |
| CN107630911A (en) * | 2017-08-09 | 2018-01-26 | 宁波市镇海甬鼎紧固件制造有限公司 | A kind of check bolt |
| CN207728712U (en) * | 2018-01-02 | 2018-08-14 | 福建泉州市金正机械有限公司 | A kind of lock washer |
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2018
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