CN1042168C

CN1042168C - Sectional loosening- proof screw nut

Info

Publication number: CN1042168C
Application number: CN94116489.6A
Authority: CN
Inventors: 蒋志忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-28
Filing date: 1994-09-24
Publication date: 1999-02-17
Anticipated expiration: 2014-09-24
Also published as: FR2710706B1; CA2132943C; FR2710706A1; GB9419444D0; CA2132943A1; DE19503962A1; CN1108360A; GB2282202B; GB2282202A; AU7421894A; AU671769B2

Abstract

A half nut has a short shank with an external screw thereon and an inner wall which confines an axial hole therein. The inner wall has an internal screw thread with a first screw pitch . The external screw thread of the half nut has a second screw pitch different from the first screw pitch. The internal and external threads are substantially concentric. The external screw thread of the half nut is defined by substantially constant major and minor radii, while the internal screw thread is defined by substantially constant greatest and shortest radii. The internal screw thread has a constant half-breadth which is greater than a difference between the minor and greatest radii.

Description

Sectional loosening-proof screw nut

The invention relates to a kind of improvement of nut, be meant the design of a kind of mat tooth difference effect and spring effect especially, to reach the jam nut of the locking effect of certain packing.

Sectional loosening-proof screw nut in the past includes main nut and secondary nut, and main nut inner edge is formed with one section female thread, and outer rim is formed with one section external screw thread, and secondary nut inner edge is formed with unequal big female thread of internal diameter and little female thread.The big female thread pitch of the external screw thread of main nut and secondary nut equates and can screw togather mutually, and the pitch of the little female thread of the female thread of main nut and secondary nut is also equal, and is screwed into for a bolt that runs through parts in regular turn.The pitch of the big female thread of the pitch of the female thread of main nut and the little female thread of secondary nut and the external screw thread of main nut and secondary nut is inequality.During assembling, earlier main nut and bolt are screwed tight, screwed tight by the little female thread of secondary nut and the external screw thread of bolt, simultaneously, the big female thread of secondary nut and the external screw thread of main nut screw tight just finishes assembling.The packing effect that first road is arranged when main nut screws togather bolt, again secondary nut is screwed into synchronously bolt and main nut, when secondary nut is tight against main nut, just produced the second road packing effect between secondary nut and bolt, loosening to prevent main nut, and since the pitch of the big female thread of the external screw thread of main nut and secondary nut do not wait, therefore produced tooth difference phenomenon between the female thread of the big female thread of secondary nut, main nut and bolt, this tooth difference phenomenon is the packing effect in the 3rd road, can increase the packing degree between main nut, secondary nut and bolt.

The present invention the tooth difference effect that has, continues a kind of additional jam nut that spring effect is arranged of research for seeking better nut structure again to promote anti-loosing effect except between major and minor nut and bolt, make more packing between major and minor nut.

The object of the present invention is to provide a kind of jam nut, with tooth difference effect and spring effect, to reach the anti-loosing effect between major and minor nut really.

Another object of the present invention is to provide a kind of jam nut with coupling mechanism force makeup function.

The invention is characterized in: this nut comprises a main nut and a secondary nut, and thread center's width of main nut internal thread makes the bump of main nut have spring effect greater than the distance between its internal thread spiral shell crest line and outside thread spiral shell valley line.When main nut packing working substance, the outside thread of its bump is after secondary nut is screwed together in main nut, and main nut bump can produce the variation of compression, reaches the effect of strengthening locking packing and coupling mechanism force makeup function.

Of the present invention another is characterised in that: the spiral shell crest line of main nut internal thread is equal to or higher than externally threaded spiral shell valley line, to cause main nut bump better spring effect is arranged.

Nut of the present invention comprises a main nut and a secondary nut, and main nut has a body, and body one end has extended to form a bump, and the outer edge surface of bump forms outside thread, and main nut central interior is provided with the internal thread that runs through.Inner first internal thread and second internal thread that forms different inner diameters of secondary nut, the outside thread of main nut and the pitch of internal thread are unequal, the outside thread of main nut has the pitch that equates with secondary nut first internal thread, the internal thread of main nut has uniform pitch mutually with second internal thread of secondary nut, therefore has tooth difference effect between major and minor nut.And, thread center's width of main nut internal thread is greater than the distance between internal thread spiral shell crest line and outside thread spiral shell valley line, and the spiral shell crest line of internal thread is lower than externally threaded spiral shell valley line, makes the bump thickness of main nut form the kenel of approximate W type, so has compressible elastic reaction.Tooth difference and the spring effect of borrowing major and minor nut combination to be had can be reached the effect of the locking and coupling mechanism force supply of certain packing.In addition, except thread center's width of main nut internal thread greater than the distance between internal thread spiral shell crest line and outside thread spiral shell valley line, the spiral shell crest line of main nut internal thread is equal to or higher than externally threaded spiral shell valley line, makes main nut bump that better spring effect be arranged.

The present invention is described in detail below in conjunction with drawings and Examples:

Fig. 1 is the major and minor nut sectional view of the present invention's first preferred embodiment.

Fig. 2 is the enlarged diagram at II place among Fig. 1.

Fig. 3 is the deformation state figure of main nut spiral shell on bolt of the present invention's first preferred embodiment.

Fig. 4 is secondary nut of the present invention's first preferred embodiment and the main nut deformation state figure when screwing togather.

Fig. 5 is the stress figure after the major and minor nut of the present invention's first preferred embodiment makes up.

Fig. 6 is the major and minor nut structure amplification view of the present invention's second preferred embodiment.

Fig. 7 is the user mode figure of the present invention's second preferred embodiment.

As shown in Figure 1, it is the sectional view of the present invention's first preferred embodiment master nut, secondary nut, present embodiment comprises a main nut 1 and a secondary nut 2, main nut 1 has a body 11, body 11 1 ends are extended with a bump 12, the outer edge surface of bump 12 is formed with outside thread 120, and main nut 1 central interior is provided with the internal thread 13 that runs through.The internal diameter that secondary nut 2 inside are formed with first internal thread 210 and second internal thread, 220, the first internal threads 210 is a bit larger tham the internal diameter of second internal thread 220.The outside thread 120 of main nut 1 bump 12 equates with the pitch (Pitch) of first internal thread 210 of secondary nut 2, the internal thread 13 of main nut 1 and second internal thread 220 of secondary nut 2 are uniform pitchs mutually, but the pitch unequal (pitch of outside thread 120 is slightly smaller than the pitch of internal thread 13) of the outside thread 120 of main nut 1 bump 12 and internal thread 13.

As shown in Figure 2, thread center's width 131 of the internal thread 13 of main nut 1 must be greater than the distance 14 of 1201 of internal thread 13 spiral shell crest lines 132 and outside thread 120 spiral shell valley lines, and the spiral shell crest line 132 of internal thread 13 must be lower than the spiral shell valley line 1201 of outside thread 120, so that the thickness of main nut 1 bump 12 forms the aspect of approximate W type, has compressible elastic reaction.

As shown in Figure 3, be the present invention first deformation state figure of preferred embodiment master nut spiral shell on bolt, when main nut 1 is desired to be used on the bolt 3 when working substance 90 clamped, internal thread 13 with main nut 1 is screwed together on the bolt 3 earlier, and be located at the pad 31 of present embodiment and 90 of working substances with clamping working substance 90 with body 11 end faces compressings, when main nut 1 is screwed together on the bolt 3, the basic principle that screws togather according to screw thread, the flank of thread of two screw threads contacts and the pushing force of the mutual friction of generation, cause the effect of packing, therefore when the internal thread 13 of main nut 1 screws togather with bolt 3, the two is subjected to the effect of aforementioned pushing force and produces distortion, the body 11 of main nut 1 has the sufficient intensity distortion that contends with because of thickness is thicker, make winner's nut 1 produce relative deformation at the

internal thread

13 and 3 on the bolt at body 11 places, bump 12 at main nut 1 is less because of thickness, its strength deficiency is with the distortion that contends with, therefore cause the monolateral distortion of main nut 1 bump 12, bolt 3 is then very little at the amount of deformation at main nut 1 bump 12 places.Because main nut 1 bump 12 is the screw threads that are the W type, so be subjected to the pushing force effect of 3 on aforementioned and bolt at bump 12, make internal thread 13 fully clamp (because of the inboard suffered pushing force bigger) at the flank of thread of 121 places, inboard of bump 12 and bolt 3, then by laterally 122 places gradually, 121 places, 123 places are because of the relation of thread pitch, flank of thread is to clamp by halves, so main as can be known nut 1 bump 12 is in the amount of deformation maximum at 121 places, 122 places secondly, and 123 place's amount of deformation minimums, the bump 12 of main nut 1 is exactly influence little because of thickness and that be out of shape, and produce as the compressed situation of spring, form main nut 1 bump 12 is reduced to Fig. 3 by Fig. 1 the original length L1 length L 2.Hence one can see that, when main nut 1 spiral shell during packing working substance 90, will produce gradually little from inside to outside irregular deformation phenomenon at bump 12 on bolt 3.

Be the secondary nut of first embodiment of the invention and the main nut deformation state figure when screwing togather as shown in Figure 4, also the packing working substance is after 90s on bolt 3 when aforementioned main nut 1 spiral shell, second internal thread 220 with secondary nut 2 is screwed together on the bolt 3 again, and first internal thread 210 of secondary nut 2 is screwed together on the outside thread 120 of main nut 1 bump 12, main nut 1 is screwed togather mutually with secondary nut 2.When secondary nut 2 screws togather with main nut 1, because first internal thread, 210 pitch of secondary nut 2 are different from the pitch (pitch of first internal thread 210 is less than the pitch of second internal thread 220) of second internal thread 220, so when second internal thread 220 helical pitch of whenever advancing, the progression that first internal thread 210 necessarily advances and surpasses a helical pitch and be arithmetic series, therefore first internal thread 210 more forward spiral shell to advance the pushing force that can cause the outside thread 120 of main nut 1 bump 12 bigger, that is to say, when first internal thread 210 of secondary nut 2 is screwed together in the outside thread 120 of main nut 1 bump 12, pushing force minimum at 211 places, secondary nut 2 first internal threads, 210 outsides to main nut 1 bump 12, take second place in 212 places, the pushing force maximum at 213 places, and the pushing force effect of main nut 1 bump 12 when screwed togather by secondary nut 2, produce compressive strain, reduce distortion once more by length L shown in Figure 32 and become length L shown in Figure 43, its amount of deformation is 213 place's maximums, take second place in 212 places, 211 place's minimums, amount of deformation when being screwed into bolt 3 with above-mentioned main nut 1 is just the opposite, therefore, make secondary nut 2 after being screwed into main nut 1, main nut 1 bump 12 is subjected to the pushing compression of secondary nut 1 first internal thread 210 and becomes the regular metaboly that flank of thread clamps fully, that is to say, the amount of deformation of 121+211 is the amount of deformation that equals 122+212, also equals the amount of deformation of 123+213.

Main nut 1 is when screwing togather bolt 3, the spring effect packing working substance 90 that thickness had that is the W type by bump 12, when secondary nut 2 screws togather with main nut 1 again, by the tooth difference effect of different pitch and the spring effect that compresses main nut 1 bump 12 once more, make 2 on winner's nut 1 and secondary nut that the restraining function of pushing mutually be arranged, so cause secondary nut 2 and main nut 1 locking and positioning, prevent the main nut 1 loosening effect that retreats to reach, the bump 12 of main nut 1 was subjected to pushing of secondary nut 2 first internal threads 210 and produced the pre-power of spiral this moment.

As shown in Figure 5, be the stress figure after the major and minor nut combination of the present invention, when main nut 1 borrows internal thread 13 to be screwed together in packing working substance 90 on the bolt 3, and after borrowing its first internal thread 210 to be screwed together in the outside thread 120 of main nut 1 bump 12 on secondary nut 2 again, because the relation that major and

minor nut

1,2 has aforementioned tooth difference effect to exist, therefore cause the locking strength of pushing mutually, combining closely between just major and

minor nut

1,2 the two structure is integral, and forms to have the function of locking location.And because after secondary nut 2 is packed in main nut 1, the packing that main nut 1 is limited by secondary nut 2 must produce the spring effect of compression variation, makes major and

minor nut

1,2 form anti-loosing effects.At main nut 1 spiral shell on bolt 3 during packing working substance 90, the internal thread 13 of main nut 1 borrows bolt 3 screw threads to be screwed into effect, between internal thread 13 and bolt 3 outside threads, produce a locked-up stress 82 to working substance 90 directions, the power that screws of main nut 1 is bigger, then locked-up stress 82 is just bigger, bolt head 32 places of working substance 90 the other ends are because main nut 1 is screwed into the relation that screws, bolt head 32 also produces a fastening force 81 (reaction force just) to working substance 90 directions, and this fastening force 81 equals locked-up stress 82.It is bigger that main nut 1 screws strength, locked-up stress 82 is just bigger, and the amount of deformation of

bolt

3 and 13 screw thread surface of contact of main nut 1 internal thread is also bigger, the bump 12 that makes winner's nut 1 shorten distortion and the tooth difference that causes 3 on main nut 1 outside thread 120 and bolt more greatly, when first internal thread 210 of secondary nut 2 screws tight on the outside thread 120 of main nut 1, because the tooth difference of main nut 1 bump 12 relation, mutual pushing force increases progressively gradually between both screw threads, because main nut 1 has been in the state of packing working substance 90, the pushing force that secondary nut 2 spiral shells are produced on main nut 1 can't make main nut 1 again to working substance 90 direction packings, so the pushing force that the outside thread 120 of 210 pairs of main nuts 1 of first internal thread of secondary nut 2 produces is stayed between two flank of thread, and the pre-power 83 of the formation described spiral of leading portion, the pre-power 83 of this spiral is screwed into gradually to screw and increases progressively because of 210 pairs of main nut 1 outside thread 120 of first internal thread of secondary nut 2, and this pre-power 83 of making equals locked-up stress 82.That is to say, main nut 1 spiral shell produces locked-up stress 82 on bolt 3 time, produce a rightabout fastening force 81 at bolt head 32 because of the effect of locked-up stress 82,

outside thread

120 and 3 effects because of locked-up stress 82 of bolt at main nut 1 cause the tooth difference to increase, the increase so the outside thread 120 of main nut 1 is directly proportional with the tooth difference of second internal thread 220 of secondary nut 2, when secondary nut 2 screws, 120 of first internal thread 210 and main nut 1 outside threads produce the pre-power 83 of spiral, the pre-power 83 of this spiral concerns the increase that is directly proportional with the tooth difference, last locked-up stress 82 equals fastening force 81, and locked-up stress 82 also equals the pre-power 83 of spiral.

As shown in Figure 5, (generation of this distortion may be subjected to vibration influence when the interface of 90 of bolt 3 and working substances produces distortion, or the elasticity variation because of material itself produces under bolt and the long-term packing of working substance) time, the fastening force 81 of 32 pairs of working substances 90 of bolt head is reduced, locked-up stress 82 is also along with minimizing, but 1 on secondary nut 2 and main nut can't directly be subjected to the influence of deformation of media by tooth difference and the pre-power 83 of spiral that spring effect produced, the pre-power 83 of this spiral can not reduce, make the pre-power 83 of spiral greater than locked-up stress 82, cause main nut 1 to be subjected to pushing of this pre-power 83 and to the back-out of rebounding of working substance 90 directions, winner's nut 1 is pushed by the pre-power 83 of spiral and screwed out and push against working substance 90, keep main,

secondary nut

1,2 are in the locking state of packing working substance 90, and this is a coupling mechanism force makeup function of the present invention.So 1,2 effects that locking packing is not only arranged of major and minor nut, also has the coupling mechanism force makeup function, when making 90 of bolt 3 and working substances because of the decay of interface distortion fastening force, main nut 1 can be screwed out the deficiency with the supply coupling mechanism force, reach the locking effect of packing working substance really.

As shown in Figure 6, it is the major and minor nut structure amplification view of the present invention's second preferred embodiment, present embodiment is roughly identical with previous embodiment, comprise a main nut 5 and a secondary nut 6, main nut 5 has a body 51, body 51 1 ends have extended to form a bump 52, and the outer edge surface of this bump 52 is formed with outside thread 520, and main nut 5 central interior are provided with the internal thread 53 that runs through.The internal diameter that secondary nut 6 inside are formed with first internal thread 610 and second internal thread, 620, the first internal threads 610 is a bit larger tham the internal diameter of second internal thread 620.The outside thread 520 of main nut 5 bumps 52 equates with the pitch (Pitch) of first internal thread 610 of secondary nut 6, the internal thread 53 of main nut 5 equates with the pitch of second internal thread 620 of secondary nut 6, but the outside thread of main nut 5 bumps 52 520 is unequal with the pitch of internal thread 53.Present embodiment is characterised in that: thread center's width 531 of the internal thread 53 of main nut 5 must be greater than the distance 54 of 5201 of these internal thread 53 spiral shell crest lines 532 and outside thread 520 spiral shell valley lines, make the state of the thickness formation approximate W type of main nut 5 bumps 52, have compressible elastic reaction.And the spiral shell crest line 532 of internal thread 53 is equal to or higher than the spiral shell valley line 5201 of outside thread 520, so makes the thickness of winner's nut 5 bumps 52 littler.

The master of present embodiment, secondary nut 5,6 except using applicable to first embodiment's locking packing function, more can be applied to the function of any fixed point location, as shown in Figure 7, be the user mode figure of the present invention's second preferred embodiment, work as the master, secondary nut 5,6 when using on screw rod 7 as locating function, earlier main nut 5 is screwed on the screw rod 7, after being screwed into, main nut 5 can produce as the described deformation state of first embodiment, but because the reduced down in thickness of present embodiment master nut 5 bumps 52, it is more obvious to produce compressible degree, but rebounding force weakens, so the amount of deformation of pushing mutually between the internal thread 53 of main nut 5 bumps 52 and screw rod 7 screw threads is bigger, bump 52 length have more significantly and shorten, first internal thread 610 with secondary nut 6 is screwed together on the outside thread 520 of main nut 5 then, principle with first embodiment, pushing and produce compressive strain again when the bump 52 of main nut 5 is screwed into by secondary nut 6, the bump 52 of main nut 5 increases because of amount of deformation, make the bigger screw thread clamping action of 610 generations of first internal thread of internal thread 53 and screw rod 7 screw threads and outside thread 520 and secondary nut 6, winner's nut 5 is positioned on the screw rod 7 because of this clamping action, and, 6 clamping force effects of main nut 5 and secondary nut have anti-loosing effect, main nut 5 pine backward moves back, so it is main, secondary nut 5,6 just can reach the effect that is positioned on screw rod 7 arbitrary fixed points.After main nut 5 is combined on the screw rod 7 with secondary nut 6, by main nut 5 internal thread 53 and 7 fastening forces of pushing mutually of screw rod (54 places among Fig. 7) at body 51 places, the internal thread 53 of main nut 5 bumps 52 and the fastening force (55 places among Fig. 7) of screw rod 7, the fastening force that first internal thread of the outside thread 520 of nut 5 bumps 52 and secondary nut 6 is 610 (56 places among Fig. 7), the fastening force (57 places among Fig. 7) that second internal thread 620 of secondary nut 6 and screw rod are 7, main nut 5 and secondary nut 6 mating faces (58 places among Fig. 7), after the fastening force at five places causes main nut 5 to be combined on the screw rod 7 with secondary nut 6 whereby, be difficult to be reached locating function by back-out again, and any one fixed point location on screw rod 7 arbitrarily.

In sum, the present invention is by tooth difference effect and spring effect that main nut and secondary nut combination back is produced, makes the anti-loosing effect that has certain packing between major and minor nut, and can produce the makeup function of coupling mechanism force to working substance.

Claims

1. sectional loosening-proof screw nut, this nut comprises a main nut and a secondary nut, and this main nut central interior is provided with the internal thread that runs through, and this pair nut inside is formed with the first different internal thread of internal diameter and second internal thread;

This main nut has a body, and this body one end extends to form a bump, and the outer edge surface of this bump has outside thread, and the outside thread of this main nut and the pitch of internal thread are unequal;

The internal diameter of first internal thread of this pair nut is slightly larger than the internal diameter of second internal thread, the outside thread of this main nut bump equates with the pitch of first internal thread of secondary nut and can screw togather mutually, the internal thread of this main nut equates that with the pitch of second internal thread of secondary nut the outside thread of this main nut bump and the pitch of internal thread are unequal; It is characterized in that:

Thread center's width of the internal thread of this main nut is greater than the internal thread spiral shell crest line of this main nut bump and the distance between outside thread spiral shell valley line.