Lock nut structural components

Abstract

The invention discloses a locking nut structural component, which relates to the technical field of engineering machinery structures. In the locking nut structural component, a small-diameter hole and a large-diameter hole are arranged on the tightening nut, and the small-diameter hole is threadedly connected to the screw of the connecting bolt; the locking block group includes at least two locking blocks arranged in a split manner, each locking block is arranged in sequence around the circumference of the screw, and there is a circumferential gap between at least two locking blocks, the locking block extends into the large-diameter hole, and the outer peripheral surface of the locking block is an outer inclined surface; a locking hole is arranged on the locking nut, and the inner peripheral surface of the locking hole includes an inner inclined surface adapted to the outer inclined surface, the locking nut extends into the large-diameter hole axially, the locking nut presses the locking block on the screw, the inner inclined surface is extruded and matched with the outer inclined surface, and the large-diameter hole is threadedly connected to the locking nut. After the assembly is connected to the connected part, the locking nut and the locking block form a wedge-shaped match, which can avoid radial relative movement between the connecting bolt and the tightening nut, and has a good anti-loosening effect.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery structures, and in particular to a locking nut structural component. Background Art

[0002] At present, bolt and nut connections are commonly found in engineering machinery structures. However, under working conditions such as high speed, heavy load, variable load, and requirements for disassembly and reuse, nuts are prone to loosening.

[0003] The main reason for the loosening of the nut and the ultimate failure of the pre-tightening of the connected parts is that when the connected parts are subjected to lateral variable loads, the tiny gap between the mating surfaces of the nut and the bolt causes radial relative sliding between the nut and the bolt, resulting in a decrease in the friction between the contact surfaces of the threaded connection, which ultimately causes the nut to loosen, making it difficult to apply to working conditions with high anti-loosening requirements.

[0004] Therefore, how to improve the anti-loosening capability is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a locking nut structural assembly having a higher locking capability.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A locking nut structural assembly, comprising a connecting bolt, a locking block set, a tightening nut and a locking nut;

[0008] The end of the connecting bolt, the tightening nut and the locking nut are arranged in sequence along the axial direction, and there is a gap between the end and the tightening nut in the axial direction;

[0009] The tightening nut is provided with a tightening hole along the axial direction, and along the direction away from the end head in the axial direction, the tightening holes are a small diameter hole and a large diameter hole in sequence, a positioning step surface is provided between the small diameter hole and the large diameter hole, and the small diameter hole is threadedly connected with the screw of the connecting bolt;

[0010] The locking block group includes at least two locking blocks which are arranged in a split manner, each of which is arranged in sequence around the circumference of the screw, and there is a circumferential gap between at least two of the locking blocks. The locking block extends into the large-diameter hole, and the outer peripheral surface of the locking block is an outer inclined surface, and in the axial direction and in the direction away from the end head, the outer inclined surface gradually deviates toward the center of the screw;

[0011] A locking hole is provided on the locking nut, and an end of the inner circumferential surface of the locking hole close to the end head is an inner inclined surface adapted to the outer inclined surface, the locking nut extends axially into the large diameter hole, the locking nut presses the locking block to the screw, the inner inclined surface is extruded and fitted with the outer inclined surface, and the inner circumferential surface of the large diameter hole is threadedly connected to the locking nut.

[0012] Preferably, the locking block is threadably connected to the screw rod.

[0013] Preferably, the large-diameter hole and the small-diameter hole are threaded holes with opposite thread directions.

[0014] Preferably, the locking hole is axially penetrated on the locking nut.

[0015] Preferably, one end of the locking hole away from the end head is a light hole, the light hole is axially butted with the inner inclined surface, and the light hole is not in contact with the screw.

[0016] Preferably, an end of the outer peripheral surface of the locking nut away from the end head is a convex edge protruding in the radial direction.

[0017] Preferably, it further comprises a washer, which is sleeved on the screw rod, and is arranged between the end head and the tightening nut, and there is a gap between the washer and the end head in the axial direction.

[0018] Preferably, it also includes a connecting piece group, which includes at least two connected pieces arranged in sequence along the axial direction, and the connected pieces are provided with connecting through holes along the axial direction. The screw is inserted into the connecting through holes of each of the connected pieces in sequence along the axial direction, and the end head and the tightening nut press the connecting piece group axially.

[0019] The anti-loosening nut structural component provided by the present invention comprises a connecting bolt, a locking block group, a tightening nut and a locking nut.

[0020] The end of the connecting bolt, the tightening nut and the locking nut are arranged in sequence along the axial direction, and there is a gap between the end and the tightening nut in the axial direction.

[0021] A tightening hole is set through the tightening nut along the axial direction, and along the direction away from the end head in the axial direction, the tightening holes are successively a small diameter hole and a large diameter hole, a positioning step surface is provided between the small diameter hole and the large diameter hole, and the small diameter hole is threadedly connected to the screw of the connecting bolt.

[0022] The locking block group includes at least two locking blocks which are arranged in a split manner. The locking blocks are arranged in sequence around the circumference of the screw. There is a circumferential gap between at least two locking blocks. The locking block extends into the large diameter hole. The outer peripheral surface of the locking block is an outer inclined surface, and in the axial direction and away from the end head, the outer inclined surface gradually deviates toward the center of the screw.

[0023] A locking hole is provided on the locking nut, and the inner circumferential surface of the locking hole, close to the end head, is an inner inclined surface matched with the outer inclined surface. The locking nut extends axially into the large diameter hole, and the locking nut presses the locking block onto the screw rod. The inner inclined surface is squeezed and matched with the outer inclined surface, and the inner circumferential surface of the large diameter hole is threadedly connected with the locking nut.

[0024] During assembly, the screw rod is first inserted into the connecting through holes axially penetrated on each connected part in sequence, and then the tightening nut is threadedly locked on the screw rod, and the end of the connecting bolt and the tightening nut are axially clamped on each connected part, and then each locking block is placed in the large diameter hole, and each locking block is arranged in sequence along the circumference of the screw rod, and then the locking nut is axially extended into the large diameter hole, the locking nut is threadedly connected to the large diameter hole, and the inner inclined surface of the locking nut is fit with the outer inclined surface of the locking block, so that the locking nut and the locking block form a wedge-shaped fit, which can apply radial and axial forces between the connecting bolt and the tightening nut, supporting the tightening nut and the connecting The locking blocks are arranged in sequence along the circumferential direction, and there is a gap between at least two locking blocks. Compared with the implementation method in which the locking blocks are directly arranged in an annular shape and sleeved on the outside of the screw, the fit between each locking block and the screw can be ensured. After the locking nut is tightened, the locking nut is wedged between the tightening nut and the locking block, which can eliminate the gap between the locking block and the screw to the maximum extent without generating any additional stress. Long-term tightening can be achieved under lateral vibration and variable load conditions, and the anti-loosening effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 A cross-sectional view of a specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention;

[0027] Figure 2 A cross-sectional view of tightening a nut in a specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention;

[0028] Figure 3 A cross-sectional view of a locking block in a specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention;

[0029] Figure 4A top view of a locking block assembly in a specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention;

[0030] Figure 5 A cross-sectional view of the locking nut in the specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention.

[0031] Reference numerals:

[0032] Connecting member group 1, first connected member 11, second connected member 12, connecting through hole 13;

[0033] Washer 2;

[0034] Tighten the nut 3, tighten the hole 31, the small diameter hole 311, the large diameter hole 312, and the positioning step surface 313;

[0035] Connecting bolt 4, end 41, screw rod 42;

[0036] Locking nut 5, locking hole 51, inner inclined surface 511, light hole 512, convex edge 52, locking external thread surface 53;

[0037] The locking block assembly 6 includes a locking block 61 , a locking internal thread surface 611 , and an external inclined surface 612 . DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The core of the present invention is to provide a locking nut structural component with high locking capability.

[0040] In the specific embodiment 1 of the anti-loosening nut structural assembly provided by the present invention, please refer to Figures 1 to 5 , including a connecting bolt 4, a locking block group 6, a tightening nut 3 and a locking nut 5.

[0041] The end 41 of the connecting bolt 4, the tightening nut 3 and the locking nut 5 are arranged in sequence along the axial direction, and there is a gap between the end 41 and the tightening nut 3 in the axial direction, and the gap is used to install multiple connected parts. These connected parts constitute a connecting part group 1, so that the connected parts can be pressed axially by the end 41 and the tightening nut 3.

[0042] like Figure 2As shown, the tightening nut 3 is provided with a tightening hole 31 in the axial direction, and in the direction away from the end head 41 in the axial direction, the tightening hole 31 is sequentially a small diameter hole 311 and a large diameter hole 312, and the aperture of the large diameter hole 312 is larger than that of the small diameter hole 311. Specifically, the two hole structures can be cylindrical holes arranged coaxially. There is a positioning step surface 313 between the small diameter hole 311 and the large diameter hole 312, and the small diameter hole 311 is threadedly connected with the screw 42 of the connecting bolt 4. Among them, the end head 41 is arranged at one end of the screw 42 in the axial direction.

[0043] like Figure 3 and Figure 4 As shown, the locking block group 6 includes at least two locking blocks 61 that are separately arranged, and specifically three can be arranged. In other embodiments, other numbers can also be arranged. Each locking block 61 is arranged in sequence around the circumference of the screw 42, and there is a circumferential gap between at least two locking blocks 61. The locking block 61 extends into the large diameter hole 312, and specifically can be fully extended or partially extended in the axial direction. One end of the locking block 61 in the axial direction can abut against the positioning step surface 313. The outer peripheral surface of the locking block 61 is an outer inclined surface 612, and in the axial direction and in the direction away from the end head 41, the outer inclined surface 612 gradually deviates toward the center of the screw 42. Specifically, the locking block 61 has a conical structure as a whole.

[0044] like Figure 5 As shown, a locking hole 51 is provided on the locking nut 5, and an end of the inner circumferential surface of the locking hole 51 close to the end head 41 is an inner inclined surface 511 adapted to the outer inclined surface 612, as shown in FIG. Figure 5 As shown, the inner circumference of the locking hole 51 near the end of the end head 41 is a conical surface. The locking nut 5 extends axially into the large diameter hole 312. The locking nut 5 presses the locking block 61 on the screw rod 42, the inner inclined surface 511 and the outer inclined surface 612 are pressed and matched, and the inner circumference of the large diameter hole 312 is threadedly connected with the locking nut 5.

[0045] In this embodiment, during assembly, the screw rod 42 is first inserted into the connecting through hole 13 axially penetrating on each connected part in turn, and then the tightening nut 3 is threadedly locked on the screw rod 42, and the end 41 of the connecting bolt 4 and the tightening nut 3 axially clamp each connected part, and then each locking block 61 is placed in the large diameter hole 312, and each locking block 61 is sequentially arranged along the circumference of the screw rod 42, and then the locking nut 5 is axially extended into the large diameter hole 312, the locking nut 5 is threadedly connected to the large diameter hole 312, and the inner inclined surface 511 of the locking nut 5 is fitted with the outer inclined surface 612 of the locking block 61, so that the locking nut 5 and the locking block 61 form a wedge-shaped fit, which can apply radial and axial forces between the connecting bolt 4 and the tightening nut 3. The force is supported between the tightening nut 3 and the connecting bolt 4 to avoid radial relative movement between the connecting bolt 4 and the tightening nut 3. In addition, since the locking block group 6 is a split structure, the locking blocks 61 are arranged in sequence along the circumferential direction, and there is a gap between at least two locking blocks 61. Compared with the implementation method in which the locking block is directly arranged in an annular shape and sleeved on the outside of the screw 42, the fit between each locking block 61 and the screw 42 can be ensured. After the locking nut 5 is tightened, the locking nut 5 is wedged between the tightening nut 31 and the locking block 613, which can eliminate the gap between the locking block 61 and the screw 42 to the maximum extent without generating any additional stress. Under lateral vibration and variable load conditions, long-term tightening can be achieved, and it has a good anti-loosening effect.

[0046] Furthermore, if Figure 3 and Figure 4 As shown, the locking block 61 is threadedly connected to the screw rod 42. Specifically, a locking internal thread surface 611 is provided on the inner circumferential surface of the locking block 61. The locking internal thread surface 611 of the locking block 61 is threadedly connected to the screw rod 42 to further improve the fit between the locking block 61 and the screw rod 42 and the stability of the installation of the locking block 61.

[0047] For further information, please refer to Figure 2 , the large diameter hole 312 and the small diameter hole 311 are threaded holes with opposite rotation directions. Optionally, the inner circumference of the small diameter hole 311 is a right-hand thread, and the large diameter hole 312 is a left-hand thread. During the disassembly and assembly process, when one of the locking nut 5 and the connecting bolt 4 is rotated and installed on the tightening nut 3, it will not affect the other. Of course, in other embodiments, the large diameter hole 312 and the small diameter hole 311 are threaded holes with the same rotation direction.

[0048] Furthermore, if Figure 1 and Figure 5 As shown, the locking hole 51 is axially penetrated on the locking nut 5, so as to freely control the distance that the locking nut 3 extends into the large diameter hole 312.

[0049] Furthermore, if Figure 5As shown, the end of the locking hole 51 away from the end 41 is a light hole 512, specifically a cylindrical light hole 512, the light hole 512 is axially butted with the inner inclined surface 511, and the light hole 512 does not contact the screw 42, which can prevent the screw 42 from damaging the light hole 512. Specifically, the portion of the outer circumferential surface of the locking nut 5 that is radially opposite to the inner inclined surface 511 is a cylindrical surface, and at least a portion of the surface of the cylindrical surface is provided with a locking external thread surface 53 to be threadedly connected to the large diameter hole 312.

[0050] Furthermore, if Figure 5 As shown, the end of the outer circumferential surface of the locking nut 5 away from the end head 41 is a radially protruding ridge 52, and the movement of the locking nut 5 can be controlled by using the ridge 52 as a force application location.

[0051] Furthermore, if Figure 1 As shown, the anti-loosening nut structural assembly also includes a washer 2, which is sleeved on the screw 42, and the washer 2 is arranged between the end 41 and the tightening nut 3. There is an axial gap between the washer 2 and the end 41, and the washer 2 can be used to separate the connecting piece group 1 and the tightening nut 3 to prevent the tightening nut 3 from wearing the connecting piece group 1.

[0052] Furthermore, if Figure 1 As shown, the anti-loosening nut structural assembly also includes a connecting member group 1, and the connecting member group 1 includes at least two connected members arranged in sequence along the axial direction. Optionally, there are two connected members, specifically a first connected member 11 and a second connected member 12. In other embodiments, the number of connected members can also be other. The connected members are provided with connecting through holes 13 along the axial direction, and the screw rod 42 is sequentially inserted into the connecting through holes 13 of each connected member along the axial direction, and the end 41 and the tightening nut 3 press the connecting member group 1 along the axial direction.

[0053] In the anti-loosening nut structural assembly of this embodiment, during assembly, the connecting piece group 1 and the washer 2 are installed on the screw 42, and the tightening nut 3 is tightened on the connecting bolt 4 according to the preset required torque value. The small diameter hole 311 of the tightening nut 3 cooperates with the thread of the screw 42 to achieve the purpose of pre-tightening the connected parts. The locking block 61 is evenly placed in the large diameter hole 312 of the tightening nut 3, and the locking inner thread surface 611 of the locking block 61 is screwed with the thread of the connecting bolt 4, and then the locking nut 5 is screwed and tightened with the large diameter hole 312 of the tightening nut 3. At this time, as the locking nut 5 is screwed down (the locking nut 5 does not contact the screw 42), the inner inclined surface 511 of the locking hole 51 of the locking nut 5 contacts the outer inclined surface 612 of the locking block 61, and the locking nut 5 squeezes the locking block 61 laterally, so that the locking block 61 locks the screw 42, and the locking inner thread of the locking block 61 The gap between the surface 611 and the screw rod 42 is eliminated, and the structure of the inner inclined surface 511 on the locking nut 5 forms a wedge effect between the tightening nut 3 and the locking block 61. The overall structure is in a tightly locked state. When subjected to a lateral variable load, due to the locking effect of the locking nut 5, the tightening nut 3 loses its loosening retreat space, and the locking nut 5 itself forms a wedge effect in the structure and cannot be loosened. The loosening direction of the locking nut 5 is the tightening direction of the tightening nut 3, thereby achieving the purpose of preventing the overall structure from loosening, and can solve the problem of nut loosening failure in the mechanical connection structure.

[0054] The anti-loosening nut structural assembly in this embodiment, which is matched with the tightening nut 3, the locking nut 5, the connecting bolt 4 and the locking block 61, is mainly used as a pre-tightening structural device for the connected parts. Among them, the locking block group 6 is a split structure. After the locking nut 5 is tightened, the thread gap between the locking block 61 and the screw 42 can be eliminated to the maximum extent without generating any additional stress. It can achieve long-term tightening under lateral vibration and variable load conditions, and can effectively solve the problem of nut loosening in the bolt connection structure. At the same time, the assembly has a simple structure, is easy to implement, has reliable functions, and is highly controllable; it is detachable and reusable.

[0055] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0056] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The above is a detailed introduction to the anti-loosening nut structural assembly provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A locking nut structural assembly, characterized in that: It comprises a connecting bolt (4), a locking block group (6), a tightening nut (3) and a locking nut (5); The end head (41) of the connecting bolt (4), the tightening nut (3) and the locking nut (5) are arranged in sequence along the axial direction, and there is a gap between the end head (41) and the tightening nut (3) in the axial direction; The tightening nut (3) is provided with a tightening hole (31) extending through the axial direction, and in a direction away from the end head (41) in the axial direction, the tightening hole (31) is sequentially a small-diameter hole (311) and a large-diameter hole (312), a positioning step surface (313) is provided between the small-diameter hole (311) and the large-diameter hole (312), and the small-diameter hole (311) is threadedly connected to the screw rod (42) of the connecting bolt (4); The locking block group (6) comprises at least two locking blocks (61) which are arranged in a split manner, each of the locking blocks (61) being arranged in sequence around the circumference of the screw rod (42), and a circumferential gap being provided between at least two of the locking blocks (61). The locking blocks (61) extend into the large diameter hole (312). In the embodiment, one end of the locking block (61) in the axial direction abuts against the positioning step surface (313), the outer peripheral surface of the locking block (61) is an outer inclined surface (612), and in the axial direction and in the direction away from the end head (41), the outer inclined surface (612) gradually deviates toward the center of the screw rod (42); The locking nut (5) is provided with a locking hole (51), and one end of the inner circumferential surface of the locking hole (51) close to the end head (41) is an inner inclined surface (511) adapted to the outer inclined surface (612), the locking nut (5) extends into the large diameter hole (312) along the axial direction, the locking nut (5) presses the locking block (61) against the screw rod (42), the inner inclined surface (511) and the outer inclined surface (612) are pressed and matched, and the inner circumferential surface of the large diameter hole (312) is threadedly connected to the locking nut (5); The locking block (61) is threadedly connected to the screw rod (42); The large-diameter hole (312) and the small-diameter hole (311) are threaded holes with opposite rotation directions; The locking hole (51) is axially penetrated on the locking nut (5), and the end of the locking hole (51) away from the end head (41) is a light hole (512), the light hole (512) is axially connected with the inner inclined surface (511), and the light hole (512) does not contact the screw rod (42).

2. The anti-loosening nut structural assembly according to claim 1, characterized in that: An end of the outer peripheral surface of the locking nut (5) away from the end head (41) is a convex edge (52) protruding in the radial direction.

3. The anti-loosening nut structural assembly according to claim 1, characterized in that: It also comprises a washer (2), wherein the washer (2) is sleeved on the screw rod (42), the washer (2) is arranged between the end head (41) and the tightening nut (3), and there is a gap between the washer (2) and the end head (41) in the axial direction.

4. The anti-loosening nut structural assembly according to claim 1, characterized in that: The invention also comprises a connecting piece group (1), wherein the connecting piece group (1) comprises at least two connected pieces arranged in sequence along the axial direction, wherein the connected pieces are provided with connecting through holes (13) extending through the axial direction, wherein the screw rod (42) is inserted into the connecting through holes (13) of each of the connected pieces in sequence along the axial direction, and the end head (41) and the tightening nut (3) press the connecting piece group (1) in the axial direction.

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