A self-locking thread structure

Abstract

The present invention discloses a self-locking thread structure, which includes a nut and a bolt. The nut is in threaded fit with the bolt. A cavity at the rear end of the threaded hole of the nut is provided with an elastic piece. The tail end of the elastic piece is fixed to the inner wall surface of the nut and extends in the opposite direction of the bolt's rotation. The elastic piece is bent in a wavy line. The structure of the present invention is reasonably designed. This structure is compact and can form a good self-locking effect. It is applicable to a relatively wide range of occasions, especially suitable for precision adjustment structures that require maintaining the stability of the screw teeth and the thread structure to ensure the precision of the working performance.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and particularly relates to a self-locking thread structure. Background Art

[0002] The bolt-thread fit is a relatively common mechanical structure, which is widely used in mechanical structures such as fixation and axial adjustment. Due to external forces, such as equipment vibration, the traditional bolt-nut connection structure will loosen and disengage, affecting the fixation structure. Especially in some adjustment structures using screw-thread fits, it will affect the stable operation of the equipment. For example, when using screw-threads to adjust the frequency of a communication filter (tightening and loosening for frequency adjustment), loosening during use will cause the equipment to work unstably, affecting the normal operation of the working system. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a self-locking thread structure with a reasonable structural design.

[0004] The technical solution adopted by the present invention to solve the above problems is: a self-locking thread structure, including a nut and a bolt, the nut is in threaded fit with the bolt, and is characterized in that: a cavity at the rear end of the threaded hole of the nut is provided with an elastic piece, the tail end of the elastic piece is fixed to the inner wall surface of the nut cavity and extends in the opposite direction of the bolt rotation, the elastic piece is bent in a wavy line, the front section of the elastic piece is convex relative to the nut cavity and the head end contacts the inclined surface of the bolt thread, and the rear section of the elastic piece is concave relative to the nut cavity and the concave arc surface contacts the thread.

[0005] Further: at least two groups of elastic pieces are provided in the cavity of the nut.

[0006] Further: the elastic pieces are arranged at equal intervals relative to the nut axis.

[0007] Further: an opening is provided at the tail end of the nut, and a fixing ring for the elastic piece is provided at the opening, the elastic pieces are arranged on the fixing ring, and the fixing ring is fixed by any one of snap-fastening, welding, bonding, riveting, and screw fastening.

[0008] Compared with the prior art, the present invention has the following advantages and effects: The structure of the present invention is reasonably designed, the structure is compact, and a good self-locking effect can be formed. It is applicable to a wide range of occasions, especially suitable for precision adjustment structures that require maintaining the stability of the screw thread and the thread structure to ensure the precision of the working performance. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural view of the self-locking thread structure in an embodiment of the present invention.

[0010] Figure 2 It is a schematic diagram of the internal structure of the self-locking thread structure according to an embodiment of the present invention.

[0011] Figure numbers: nut 1, bolt 2, cavity 3, elastic sheet 4, fixing ring 5. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0013] Embodiment 1:

[0014] See also Figure 1 - Figure 2 The present embodiment provides a self-locking thread structure, including a nut 1 and a bolt 2. The nut 1 is threadedly matched with the bolt 2. The cavity 3 at the rear end of the threaded hole of the nut 1 is provided with an elastic sheet 4. The tail end of the elastic sheet 4 is fixed to the inner cavity wall of the nut 1 and extends in the opposite direction of the screwing of the bolt 2. The elastic sheet 4 is bent in a wavy line. The front section of the elastic sheet 4 is convex relative to the cavity 3 of the nut 1 and the head end contacts the inclined surface of the thread of the bolt 2. The rear section of the elastic sheet 4 is concave relative to the cavity 3 of the nut 1 and the concave arc surface contacts the thread.

[0015] This embodiment relates to a self-locking thread structure. Compared to the conventional threaded nut 1 matching structure, an elastic sheet 4 is provided on the inner cavity 3 at the rear end of the threaded nut 1. When the bolt 2 and the nut 1 are threaded together, the elastic sheet 4 exhibits the following characteristics:

[0016] Bolt 2 is screwed in: In the initial state, the head end of the elastic piece 4 contacts the lower inclined surface of the screw thread of the bolt 2. As the screw thread rises, the elastic piece 4 presses backward. Since the position of the elastic piece 4 remains unchanged, the screw thread drives the head end of the elastic piece 4 to rise, jumping from contact with the rear end surface of the screw thread to contact with the front end surface of the screw thread, and rising to the corresponding screw thread position according to this rule;

[0017] When the rear section of the elastic sheet 4 enters the screw thread, in the process of the elastic sheet 4 jumping from the rear end face of the screw thread to the front end face, the elastic sheet 4 is pressed backward, causing the elastic sheet 4 to deform, and the concave arc surface at the rear end of the elastic sheet 4 becomes more concave inward, and then contacts the top of the screw thread, giving the screw thread a set of lateral pre-tightening force.

[0018] Therefore, during the threaded engagement with the bolt 2, the axial pre-tightening force and the lateral pre-tightening force given to the thread by the elastic sheet 4 need to be overcome before the thread can be screwed in or out (screwing in overcomes the pre-tightening force given to the rear end face of the thread by the elastic sheet 4, and screwing out overcomes the pre-tightening force given to the front end face of the thread by the elastic sheet 4), thereby ensuring the self-locking ability of the thread and the bolt 2 during engagement.

[0019] Based on the above characteristics, at least two groups of elastic pieces 4 are arranged in the cavity 3 of the nut 1. Since there are deviations in the corresponding positions of the thread cross-sections of the bolt 2 in the same transverse section, at least two groups of elastic pieces 4 are arranged in the cavity 3 of the nut 1 in this embodiment. Preferably, the two groups of elastic pieces 4 are arranged axially symmetrically relative to each other. Therefore, the two groups of elastic pieces 4 contact the threads at different positions. As shown in the figure, in the same cross-section, the head end of one group of elastic pieces 4 contacts the front end face of the thread, and the other group of elastic pieces 4 contacts the rear end face of the thread. During the screwing-in process, according to the above characteristics of the screwing-in and screwing-out of the bolt 2, it can be known that during the screwing-in or screwing-out process, the two groups of elastic pieces 4 pre-tighten the threads in the opposite direction, and one group of elastic pieces 4 squeezes and pre-tightens the threads laterally due to the deformation in the middle, thereby forming self-locking of the relative positions of the thread and the bolt 2. Without a large torque, the position can be better maintained stably. The elastic pieces 4 are arranged at equal intervals relative to the axis of the nut 1.

[0020] Embodiment 2:

[0021] The self-locking thread structure involved in this embodiment can be used in various fields to prevent the change of the thread and the bolt 2 at the preset position and perform self-locking and anti-loosening. The structure of this product is particularly suitable for precision adjustment structures that require maintaining the stability of the thread and the thread structure to ensure the working performance. For example, in the frequency modulation component of a communication filter, a threaded nut 1 fitting structure is adopted. With the traditional structure, during the use of the threaded nut 1 structure, due to external forces such as vibration, the position of the bolt 2 in cooperation with the thread is likely to change. Therefore, in this embodiment, the threaded nut 1 structure is used as the frequency modulation structure in the frequency modulation component of the communication filter. Due to its self-locking characteristics, it can preferably maintain the position stability of the frequency modulation component and is not easily loosened when affected by external forces.

[0022] Furthermore, in order to adapt to the product conversion of the structure, the bolt 2 is used as an adjustment component, and the nut 1 is used as an adjustment lining. The adjustment lining includes a lining cylinder, elastic pieces 4, and a lining piece. The front end of the lining cylinder is a threaded hole for cooperating with the adjustment component, and the rear end of the lining cylinder is a cavity 3 for accommodating the elastic pieces 4. The elastic pieces 4 are arranged on a substrate, and the lining piece arranges the elastic pieces 4 in the cavity 3 through the opening at the rear end of the inner cylinder. The substrate and the edge of the opening at the rear end of the lining piece are connected and fixed through a buckle, a screw member, or a welding bonding structure. The structure of this embodiment is compact, convenient for installation, and mass production.

[0023] The above content described in this specification is only an example of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the content of this specification of the present invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. A self-locking thread structure, comprising a nut and a bolt, wherein the nut and the bolt threads cooperate, and wherein: The cavity at the rear end of the threaded hole of the nut is provided with an elastic sheet, the tail end of the elastic sheet is fixed to the inner cavity wall of the nut and extends in the opposite direction of the bolt screwing, the elastic sheet is bent in a wavy line, the front section of the elastic sheet is convex relative to the nut cavity and the head end contacts the inclined surface of the bolt thread, the rear section of the elastic sheet is concave arc surface relative to the nut cavity, so that after the rear section of the elastic sheet enters the thread position of the bolt, in the process of the elastic sheet jumping from the rear end face of the thread to the front end face, the elastic sheet is pressed backward, causing the elastic sheet to deform, and the concave arc surface at the rear end of the elastic sheet becomes more concave inward, and then contacts the top of the thread, giving the thread a set of lateral pre-tightening force, wherein at least two groups of elastic sheets are provided in the cavity of the nut.

2. The self-locking thread structure according to claim 1, characterized in that: The elastic sheets are arranged at equal intervals relative to the axis of the nut.

3. The self-locking thread structure according to claim 1, characterized in that: The tail end of the nut is provided with an opening, and the opening is used to set a fixing ring of the elastic sheet. The elastic sheet is arranged on the fixing ring, and the fixing ring is fixed by any one of snapping, welding, bonding, riveting and screw fastening.

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