CN115126759A

CN115126759A - Locknut assembly

Info

Publication number: CN115126759A
Application number: CN202110324825.9A
Authority: CN
Inventors: 解克才
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2022-09-30

Abstract

The invention adopts a type of pertinence measures by utilizing the characteristic of double nuts when loosening: under the condition that two nuts exist, certain mechanical connection is generated between the nuts, and due to the curved mechanical structure, the nuts which are loosened and retreated inevitably generate eccentric motion, and the radial gap between the nuts and the screw is gradually eliminated as a result, so that the three nuts are connected into a unified whole, and further loosening and retreating are prevented. Meanwhile, due to the non-planar structure of the nut, the nut is actually in a radial loosening and lifting structure, so that the nut generates a lifting effect in the rotating loosening and withdrawing process, the axial gap is gradually reduced or even disappears, and the nut can be prevented from further loosening and withdrawing. The coexistence of two kinds of structures can both make corresponding clearance disappear again, leads to the pine to move back the condition naturally and can't continue to go on naturally, has prevented the production that the pine moved back to firmly lock the component.

Description

Locknut assembly

Technical Field

The invention relates to a locknut assembly.

Background

With the development of industrial modernization, as the industrial equipment cannot be integrated, the different functional parts of the equipment must be connected in a certain form. Among the various types of connections, screw and nut connections are the most widespread and common. Due to the wide application of industrial equipment, many of them are used in special industries, such as high-speed moving machinery, high-vibration machinery, and machinery with frequent temperature changes and frequent forward and backward rotation, in which motor cars, airplanes, automobiles, motors and metal processing machinery are common. In these machines, because the working environment is extreme and the overall strength of the equipment is required, the strength of the connecting part is strictly required. This results in the nut and screw being connected without loosening. At this time, the looseness prevention of the nut becomes a problem which must be carefully considered by a designer, and once the nut is loosened, the fastener is damaged if the nut is light, so that the normal use of equipment is influenced; the serious condition can cause the equipment to be damaged in advance, and more likely to cause various accidents.

At present, several types of methods for preventing looseness commonly used in industrial equipment are as follows: mechanical looseness prevention, friction looseness prevention, rivet punch looseness prevention and structural looseness prevention. In general, even looseness prevention does not need to be considered in some cases, and only a kind of looseness prevention measures are simply adopted to meet the requirement of looseness prevention. However, when one or more limit conditions occur, the result effect is usually poor and boring if only one type of anti-loosening measures are taken. In order to meet the use requirement, one or two types of anti-loosening measures or a combined anti-loosening measure must be adopted at the same time to meet the actual anti-loosening requirement. The requirement of simple and quick operation in practical operation requires that the locknut assembly has the structure as concise as possible and is easy to operate, so the invention is led to appear.

Disclosure of Invention

The applicant of the present invention has developed a novel locknut assembly, which comprises an upper and a lower pair of nuts, wherein the lower nut (lock nut) has a rotating eccentric structure: the structure consists of one or more smooth arc-shaped structures, and the direction of the smooth arc-shaped structures is from the inner side of the nut to the outer side of the nut (the inner side is close to the end of the screw thread and correspondingly called the outer side), namely the structure is a rotary eccentric structure. The distance between the inside and the outside of the nut is unequal, so that the upper nut and the lower nut can generate eccentric motion when the nut pair generates relative motion. The greater the difference between the inner and outer distances of the nut, the faster the deflection motion.

On the other hand, this structure is radial pine again simultaneously and moves back the lifting structure: because the inner side and the outer side of the bottom of the arc-shaped structure are not on the same horizontal plane but on a curved (inclined) plane containing a certain angle, the size of the inclination of the arc-shaped structure has a certain corresponding relation with the pitch of the nut, namely the structure is a radial loosening and lifting structure. In fact, the structure only has a lifting function when the structure is loosened and only descends when the structure is locked due to the requirement of achieving prevention.

The upper nut (lock nut) has a structure matched and adapted with the lower (fastening) nut.

After the nut component is installed according to the standard requirement, in the using process, if relative movement occurs, because the nut component and the nut component have mechanical constraint, two movements can be generated simultaneously:

1. the eccentric movement of rotation will result in the upper and lower nuts not being concentric. And because the radial clearance existing between the two nuts and the screw rod is smaller, the eccentric rotation motion is finished quickly. At this time, the upper nut, the lower nut and the screw form a firm whole in the radial direction because no gap exists in the radial direction.

2. Radial loosening and lifting movement is carried out, because the bottom surface is of a non-planar structure with a certain angle, the bottom moves along a curved (inclined) surface when loosening and rotating, the radial height is rapidly lifted, and because the axial fit clearance between the screw rod and the nut screw teeth is very small, the clearance disappears rapidly when loosening and lifting are carried out, so that the lifting action is also rapidly stopped, and the rotary lifting movement is finished. Since there is no gap in the axial direction, a firm whole is formed. Because the structure has a locking function, the structure only has a lifting function in the loosening direction, and only can descend when being locked.

The two structures can respectively ensure that the radial and axial gaps are gradually reduced until the radial and axial gaps disappear when the nut is loosened from the fastening position, and when the gaps disappear completely, the nut and the screw form an integral structure to lock the object to be fastened powerfully. Since the clearance between the nut and the screw cannot be negative, the loosening movement cannot be continued further and will stop itself.

When the locking nut is turned from the loosened position to the initial position during disassembly, the nut assembly can be disassembled simultaneously.

Drawings

Fig. 1, free state 1 of the upper (lower) nut, is a curvilinear structure,

fig. 2 shows a state when the lock nut and the fastening nut are released and stopped, 2 is the lock (upper) nut, and 3 is the fastening (lower) nut.

FIG. 3, in the working state, 4 is the target fastener, 5 is the locking screw, 6 is the locking (upper) nut, 7 is the fastening (lower) nut, and 8 is the main structure of the present invention; rotating eccentric and radial loosening lifting structure.

Detailed Description

When the nut pair is screwed to the bottom, the nut pair is locked by a specified torque, and the locking is completed. In addition, it is not necessary to distinguish between the upper and lower nuts having similar thicknesses, and the fastening nut should be installed below and the locknut should be installed above when the thicknesses of the upper and lower nuts are significantly different (in the upper part, where the thickness is large and the thickness is small, in order to secure mechanical strength).

When the nut pair looses, the upper nut generates rotating eccentric motion and radial loosening lifting motion while loosening and withdrawing. The eccentric movement is rotated to gradually reduce the axial clearance between the nut and the screw until the clearance disappears. When the axial play has completely disappeared, the loosening movement can no longer be continued. The radial loosening and lifting movement is carried out synchronously along with the eccentric movement, except that the loosening and lifting movement gradually reduces the radial clearance between the nut and the screw rod until the radial clearance disappears. Likewise, when the radial clearance disappears, the loosening and lifting motion cannot be continued.

Of course, the continuation of the loosening condition can be prevented by the disappearance of either of the axial clearance or the radial clearance, if the two are synchronized to make the disappearance of the corresponding clearances optimal. When the synchronization is not possible, the radial clearance disappears first preferably due to the limitation of mechanical strength; after all, the screw is stressed more than the thread.

Claims

1. A locknut component comprises an upper nut and a lower nut, and is mainly a mechanical mechanism matched between the two nuts: a nut has a circular arc shaped rotating eccentric structure and the structure has different heights on the inside and outside of the nut (the inside means the side close to the screw rod after installation and the outside means the side far from the screw rod after installation). The other nut has corresponding structure adapted to match the other nut.

2. A locknut assembly as defined in claim 1, wherein the at least one rotationally eccentric feature has a circular arc shape, the surface being to be located on an inner surface of the tightening structure.

3. A locknut assembly as claimed in claim 1, wherein the at least one rotational eccentric feature comprises a circular arc shape and the radial relief lifting feature is provided by utilizing the difference in height between the inside and outside of the nut.

4. The rotary eccentric according to claim 2, which may be formed by combining one or more identical or similar structures.

5. A radial loosening and lifting structure as claimed in claim 3, which may be combined with one or more structures of the same or different geometry.