CN217055890U

CN217055890U - Conical cambered surface eccentric locknut

Info

Publication number: CN217055890U
Application number: CN202220951044.2U
Authority: CN
Inventors: 周峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-07-26
Anticipated expiration: 2032-04-22

Abstract

A conical cambered surface eccentric locknut is characterized in that one end of an eccentric convex nut is provided with a conical boss, and one end of a non-eccentric concave nut is provided with a conical concave platform; the taper surface of the tapered boss of the eccentric convex nut is a convex arc surface, and the taper surface of the tapered concave table of the non-eccentric concave nut is a convex arc surface; the conical boss of the eccentric convex nut is matched with the conical concave table of the non-eccentric concave nut; when the eccentric female nut is not applied to the lateral pressure of the eccentric male nut in an assembled state, the arc surface of the conical boss is in point-line contact with the arc surface of the conical concave platform. The utility model discloses an eccentric locknut of toper cambered surface has thoroughly solved original eccentric locknut and can't obtain the difficult problem of stable side pressure in order to keep the good locking performance of product.

Description

Conical cambered surface eccentric locknut

Technical Field

The utility model relates to a fastener field specifically is eccentric lock nut of toper cambered surface.

Background

The Japanese eccentric locknut and the mechanical standard JB/ZQ4351-2006 hexagonal locknut belong to the same product, and the conical matching surfaces of the product are both traditional conical matching surfaces no matter measured from theoretical drawings or actual products. In the drawings published by the Japanese eccentric locknut, a conical eccentric matching surface is in equal-angle matching, the actual measurement is that the taper of a non-eccentric upper nut is slightly larger than that of an eccentric lower nut, the design is mainly to solve the problem that the actual locking stress point of the conical surface of the non-eccentric upper nut is deviated when the eccentric lower nut is pressed due to thread clearance, the matching of the upper nut and the lower nut is expected to be more fit by increasing the actual taper, and the problem that the locking and locking performance of the nut fails due to the fact that the actual stress point is too deviated from the optimal stress point is prevented.

Disclosure of Invention

As shown in fig. 9 to 16, which are theoretical diagrams of the japanese eccentric nut and the JB/ZQ4351-2006 hexagonal locknut, when the non-eccentric female nut compresses the eccentric male nut, theoretically, the tapered surfaces of the upper nut (e.g., non-eccentric female nut i 4 in the drawing) and the lower nut (e.g., eccentric male nut i 3 in the drawing) should be closely fitted to firmly press the eccentric male nut side against the bolt. As clearly shown in fig. 13 and 14, theoretically, when the tapered surfaces of the upper nut and the lower nut (such as the non-eccentric female nut i 4 and the eccentric male nut i 3 in the figures) are pressed against each other, the optimal force bearing point f is necessarily the middle part of the tapered surface, and the maximum eccentric lateral pressure cannot be obtained by the upper nut and the lower nut no matter the far end force bearing point g is stressed or the near end force bearing point e is stressed.

However, threaded connections are characterized by the necessity of a corresponding tolerance fit, and a theoretical zero fit is not possible. In the practical application, when the internal thread of nut and the external screw thread of bolt carry out the mating reaction, must can make upper and lower nut can be out of shape with opposite direction because of the atress structure of eccentric nut, and then leaded to actual atress, as shown in fig. 15 and 16, the last nut that does not decentered (not eccentric female nut I4 promptly) can take place the slope under the effect of power, should be behind the slope of even complex tapering face originally, make distal end stress point g atress in the picture (actual stress point is on distal end stress point g promptly), and the best stress point f and the near-end stress point e in middle part have all taken place unsettledly (not atress). Therefore, the effect of actual use completely deviates from the ideal effect of design.

For the reasons, in the actual production of the Japanese eccentric nut, the shape that the taper of the upper nut is slightly larger (or slightly smaller) than that of the lower nut is processed according to the requirement of the matching tolerance zone of the internal thread and the external thread, so that the stress condition of the far end of the nut is greatly improved, and most of products can be well prevented from loosening. However, due to the precision of the thread fit, the stress points which can actually reach the actual lateral pressure are still not concentrated close to the optimal stress point. Increasing the taper, while alleviating the risk of distal end forces, may also increase proximal end forces. As shown in fig. 17 and 18, when the taper of the upper nut (i.e., the non-eccentric female nut ii 6) is increased, the stress ratio of the far-end stress point j is improved, but the stress of the near-end stress point h is increased (i.e., the actual stress point is concentrated on the near end), while the optimal stress point i is still suspended, and the far-end stress point j is suspended instead. The problem of optimal stress of taper fit of the upper nut and the lower nut cannot be really solved under the condition.

The utility model provides an eccentric locknut of toper cambered surface has thoroughly solved original eccentric locknut and can't obtain the difficult problem of stable side pressure in order to keep the good locking performance of product. The scheme can greatly reduce the processing precision of the product and still can keep the product at the relatively stable lateral pressure so as to stabilize the anti-loosening performance.

The utility model adopts the technical proposal that: a conical cambered surface eccentric locknut comprises an eccentric convex nut and a non-eccentric concave nut, wherein one end of the eccentric convex nut is provided with a conical boss, and one end of the non-eccentric concave nut is provided with a conical concave table; the taper surface of the tapered boss of the eccentric convex nut is a convex arc surface, and the taper surface of the tapered concave table of the non-eccentric concave nut is a convex arc surface; the conical boss of the eccentric convex nut is matched with the conical concave table of the non-eccentric concave nut; in the assembled state, when the non-eccentric female nut applies lateral pressure to the eccentric male nut, the arc surface of the conical boss and the arc surface of the conical boss are in point-line contact.

The further technical scheme is as follows: the conical included angle of the eccentric convex nut and the eccentric convex nut can be designed into an acute angle or an obtuse angle according to actual needs.

The further technical scheme is as follows: the height of the conical boss is smaller than the depth of the conical concave platform.

The further technical scheme is as follows: the height of the conical boss is larger than the depth of the conical concave table.

The further technical scheme is as follows: the height of the conical boss is equal to the depth of the conical concave table.

Since the technical scheme is used, the utility model discloses an eccentric locknut of toper cambered surface has following beneficial effect:

the common conical surface of the existing eccentric locknut can not really solve the problem that the lateral pressure applied to the lower nut by the upper nut is always ensured to be close to the optimal stress point. Even the proposal of artificially increasing or reducing the taper of the upper nut of the prior Japanese eccentric nut can still be alleviated to a certain extent, and the practical problem can not be fundamentally solved. And because the precision requirement of the contact surface is extremely high, the production and manufacturing cost is correspondingly higher, which is not beneficial to social popularization.

The invention changes the prior conical surface into the conical arc surface by changing the design of the conical surface, so that the side pressure applied to the lower nut (the eccentric convex nut) by the upper nut (the non-eccentric concave nut) is always contacted through the point line of the arc, the actual stress point is near the optimal stress point, the side pressure interacted by the upper nut and the lower nut is stable and reliable in the real sense, and the conical arc surface is the design which really improves and solves the problem that the original eccentric locknut can not ensure that the actual stress point and the optimal stress point have overlarge deviation. Meanwhile, due to the principle of the design, the production and manufacturing precision can be reduced by more than 2 grades, the condition of wide popularization and coverage of the whole manufacturing industry is completely met, and the method has great significance on safe production and low-carbon environment-friendly production.

The technical features of the conical cambered surface eccentric locknut of the present invention will be further explained with reference to the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic view of an eccentric convex nut of the present invention;

FIG. 2 is a second schematic view of the eccentric convex nut of the present invention;

FIG. 3 is a first schematic view of the non-eccentric female nut of the present invention;

FIG. 4 is a second schematic view of the non-eccentric female nut of the present invention;

FIG. 5 is a theoretical force diagram of the cone-shaped cambered surface eccentric locknut in an assembly state;

FIG. 6 is an enlarged view of A in FIG. 5;

fig. 7 is an actual force diagram of the conical cambered surface eccentric locknut of the present invention in an assembled state;

FIG. 8 is an enlarged view of B of FIG. 7;

FIG. 9 is a first schematic view of a prior art eccentric convex nut;

FIG. 10 is a schematic view of a conventional eccentric convex nut;

FIG. 11 is a first schematic view of a prior art non-eccentric female nut;

FIG. 12 is a schematic view of a conventional non-eccentric female nut;

fig. 13 is a theoretical diagram of an assembled state of a conventional eccentric nut;

FIG. 14 is an enlarged view of C in FIG. 13;

fig. 15 is a practical diagram of the prior eccentric nut in an assembled state;

FIG. 16 is an enlarged view of D in FIG. 15;

FIG. 17 is a force diagram of a prior art over-tapered eccentric nut in an assembled state;

fig. 18 is an enlarged view of E in fig. 17.

In the figure:

1-eccentric convex nut; 2-non-eccentric female nut; 3-eccentric convex nut I; 4-non-eccentric female nut I; 5-eccentric convex nut II; 6-non-eccentric female nut II; ZH-conical arc surface; p1-height of the conical boss; p2-depth of the tapered recess.

Detailed Description

An eccentric locknut with a conical cambered surface comprises an eccentric convex nut 1 and a non-eccentric concave nut 2. As shown in fig. 1 and 2, one end of the eccentric convex nut 1 is provided with a conical boss; the taper surface of the conical boss of the eccentric convex nut is a convex arc surface. As shown in fig. 3 and 4, one end of the non-eccentric female nut 2 has a tapered concave land; the taper surface of the taper concave platform of the non-eccentric concave nut is a convex arc surface. The conical boss of the eccentric convex nut is matched with the conical concave table of the non-eccentric concave nut. In the assembled state, when the non-eccentric female nut applies lateral pressure to the eccentric male nut, the arc surface of the conical boss and the arc surface of the conical boss are in point-line contact. The existing conical surface is changed into a conical arc surface ZH by changing the design of the conical surface, so that the lateral pressure applied to the eccentric convex nut by the non-eccentric concave nut is always contacted through the point line of the arc, and the actual stress point is close to the optimal stress point.

The conical included angle of the eccentric convex nut 1 and the non-eccentric concave nut 2 can be designed into an acute angle or an obtuse angle according to actual needs, and equal anti-loosening effects can be achieved.

The height P1 of the conical boss is less than or equal to or more than the depth P2 of the conical concave table, and the same effect can be obtained.

The utility model discloses an eccentric lock nut of toper cambered surface through the toper face structure that changes the eccentric lock nut of original toper for the lateral pressure of upper and lower nut interact is more stable, and locking performance is more stable, and because conical cambered surface can let the production manufacturing accuracy directly drop to IT9 level manufacturing accuracy still can be stable acquisition and good locking performance by IT6-IT7 level manufacturing accuracy.

It is clearly noted from fig. 5 to 8 that, in both theoretical and practical situations, since the tapered surfaces of the existing upper and lower nuts are changed into the tapered convex arc surfaces, when the upper and lower nuts are mutually stressed and interact, the upper and lower nuts also incline, but since the tapered surfaces are designed into the tapered arc surfaces, the arc surfaces avoid the near-end stress-free point a and the far-end stress-free point c, so that two points directly influencing the stress are suspended, the optimal stress point b in the middle part is like two round balls contacting each other, the highest points are always abutted against each other, and the low points and the far points are always suspended. In fact, referring to fig. 7 and 8, the experimental demonstration is in accordance with the theory, and the actual force point d is near the optimal force point b, so that the defect that the force points which cannot be solved by the original eccentric nut cannot be concentrated in the middle is overcome.

The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize. The above description is further illustrated in the detailed description of the present invention and it should not be understood that the embodiments of the present invention are limited to the above description, and those skilled in the art can make various simple deductions or substitutions without departing from the spirit of the present invention, which should be construed as belonging to the scope of the present invention defined by the appended claims.

Claims

1. The utility model provides an eccentric locknut of toper cambered surface which characterized in that: the nut comprises an eccentric convex nut and a non-eccentric concave nut, wherein one end of the eccentric convex nut is provided with a conical boss, and one end of the non-eccentric concave nut is provided with a conical concave platform; the taper surface of the taper boss of the eccentric convex nut is a convex circular arc surface, and the taper surface of the taper concave table of the non-eccentric concave nut is a convex circular arc surface; the conical boss of the eccentric convex nut is matched with the conical concave table of the non-eccentric concave nut; in the assembled state, when the non-eccentric female nut applies lateral pressure to the eccentric male nut, the arc surface of the conical boss and the arc surface of the conical boss are in point-line contact.

2. The tapered cambered-surface eccentric locknut of claim 1, wherein: the conical included angle of the eccentric convex nut and the eccentric convex nut can be designed into an acute angle or an obtuse angle according to actual needs.

3. The tapered cambered-surface eccentric locknut of claim 1, wherein: the height of the conical boss is smaller than the depth of the conical concave platform.

4. The tapered cambered-surface eccentric locknut of claim 1, wherein: the height of the conical boss is larger than the depth of the conical concave platform.

5. The tapered cambered-surface eccentric locknut of claim 1, wherein: the height of the conical boss is equal to the depth of the conical concave platform.