Lock nut assembly and method of installation

Abstract

The present application relates to a kind of anti-loose nut kits and installation method.It solves the defects such as unreasonable design of prior art.The anti-loose nut kit of the present application includes inner elastic member with internal thread, and constraint member that is constrained to at least part of the inner elastic member to force the pitch of the internal thread to change, the inner wall of the constraint member has conical clearance hole and cylindrical clearance hole connected in turn, the cylindrical clearance hole is connected to the small diameter end of the conical clearance hole, and when the inner elastic member contacts the junction of the cylindrical clearance hole and the conical clearance hole in the constraint member and is in the locked position, the outer conical surface of the inner elastic member and the conical clearance hole form a conical space, and at least part of the inner elastic member extends into the cylindrical clearance hole, and the cylindrical clearance hole and the outer wall of the inner elastic member form end tapered space opposite to the conical space.The present application has the advantages of achieving the purpose of anti-loose.

Description

Technical Field

[0001] This invention belongs to the field of fastener technology, and particularly relates to an anti-loosening nut kit and its installation method. Background Technology

[0002] Fasteners serve a fixing function, and are used in various applications such as railway tracks and construction machinery.

[0003] Existing fasteners generally include bolts and nuts connected to the bolts. Conventional methods to prevent loosening include setting washers or creating circular grooves on the pressure surface of the nut. Although these methods have a certain anti-loosening effect, loosening can still occur.

[0004] Of course, some inventors have devised a method to change the thread pitch by matching and engaging conical surfaces. However, this structure requires very high manufacturing precision. The inner and outer conical surfaces need to be perfectly matched to ensure the thread engagement between the thread and the screw to a certain extent. Because the manufacturing precision requirements are very high, the cost is high and it is difficult to mass-produce and process. Furthermore, it still cannot achieve the purpose of preventing loosening. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing an anti-loosening nut kit and installation method that can solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: This lock nut kit includes an internal elastic element with internal threads, and a constraint element constrained at least a portion of the internal elastic element to force a change in the pitch of the internal threads. The inner wall of the constraint element has a conical clearance hole and a cylindrical clearance hole connected in sequence. The cylindrical clearance hole is connected to the small-diameter end of the conical clearance hole. When the internal elastic element contacts the connection between the cylindrical clearance hole and the conical clearance hole in the constraint element and is in the locked position, a conical space is formed between the outer conical surface of the internal elastic element and the conical clearance hole. At least a portion of the internal elastic element extends into the cylindrical clearance hole, and the cylindrical clearance hole and the outer wall of the internal elastic element form an end-conical space with a taper opposite to that of the conical space.

[0007] In the aforementioned anti-loosening nut kit, the inner elastic element is inserted into one end face of the cylindrical clearance hole, and there is an end distance between the cylindrical clearance hole and the end face of the cylindrical clearance hole that is away from the conical clearance hole.

[0008] In the aforementioned anti-loosening nut kit, the inner elastic element and the connection are in surface-to-surface contact.

[0009] In the aforementioned anti-loosening nut kit, the inner elastic element and the connection point are in surface-to-point contact.

[0010] In the aforementioned anti-loosening nut kit, the connection between the cylindrical clearance hole and the conical clearance hole can be either an arc surface or a corner edge.

[0011] In the aforementioned anti-loosening nut kit, the portion of the inner elastic element inserted into the conical clearance hole is the elastic part, and the remaining portion is the polygonal part.

[0012] In the aforementioned anti-loosening nut kit, the elastic part includes several circumferentially distributed arc-shaped elastic blocks, and a pressure-reducing groove is formed between two adjacent arc-shaped elastic blocks.

[0013] In the aforementioned anti-loosening nut kit, a gap is maintained between the end face of the polygonal portion near the elastic portion and the corresponding end face of the constraint member when they are in the locked position.

[0014] In the aforementioned anti-loosening nut kit, a polygonal circumferential surface is provided on the circumferential direction of the constraint member.

[0015] This application also provides a method for installing the lock nut kit as described above, the method comprising the following steps: S1. Fit the constraint member onto the threaded part of the screw; S2, such that the elastic part of the inner elastic member is inserted into the conical clearance hole of the constraint member, and a conical space is formed between the outer conical surface of the inner elastic member and the conical clearance hole; The internal thread of the inner elastic element is helically connected to the thread of the screw by the rotational driving force. When the elastic part contacts the connection between the cylindrical clearance hole and the conical clearance hole, the elastic part contracts radially. When the inner elastic element is in the locked position, at least a portion of the inner elastic element extends into the cylindrical clearance hole, and the cylindrical clearance hole and the outer wall of the inner elastic element form an end conical space with a taper opposite to that of the conical space.

[0016] Compared with existing technologies, the advantages of this application are: Both conical and cylindrical clearance holes are provided, and both form spaces with the outer wall of the inner elastic element, such as conical spaces and end conical spaces. The existence of these spaces can significantly reduce the frictional resistance during the screwing of the inner elastic element. At the same time, because of the existence of these spaces, when the inner elastic element contacts the connection between the cylindrical and conical clearance holes in the constraint, the contact is only partial, which can achieve the purpose of radial contraction and axial tightening to prevent loosening and locking. Furthermore, the end conical space can also form an outward expansion of at least a portion of the inner elastic element beyond the connection. In other words, with the above design, the pitch of the internal thread of the inner elastic element at the connection is reduced to the minimum, while the two ends of the minimum pitch portion of the inner elastic element form a relatively large pitch, achieving a true anti-loosening purpose. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the internal elastic element provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the constraint component provided by the present invention.

[0019] Figure 3 This is a schematic diagram of the exploded structure of the anti-loosening nut kit provided by the present invention.

[0020] Figure 4 This is a preliminary mating structure diagram of the anti-loosening nut kit provided by the present invention.

[0021] Figure 5 This is a schematic diagram of the anti-loosening nut kit provided by the present invention in the locked position.

[0022] Figure 6 yes Figure 5 A magnified structural diagram at point A in the diagram.

[0023] Figure 7 This is a schematic diagram of the constraint structure provided by the present invention.

[0024] In the figure, there are: inner elastic element 1, elastic part 10, outer conical surface 100, arc-shaped elastic block 10a, pressure relief groove 10b, conical space 101, end conical space 102, polygonal part 11, constraint element 2, conical clearance hole 20, cylindrical clearance hole 21, polygonal peripheral surface 22, end distance L1, and interval spacing L2. Detailed Implementation

[0025] The following are specific embodiments of the invention, which are described in conjunction with the accompanying drawings. The technical solution of the invention will be further described, but the invention is not limited to these embodiments.

[0026] Example 1

[0027] like Figures 1-6 As shown, this anti-loosening nut kit includes an internal elastic member 1 having an internal thread 12, and a constraint member 2 constrained to at least a portion of the internal elastic member 1, thereby forcing a change in the pitch of the internal thread.

[0028] To facilitate the application of torque, at least a portion of the structure of the inner elastic member 1 and the constraint member 2 in this embodiment is configured as a polygonal structure, such as a hexagonal structure, which facilitates the matching of a wrench and the application of torque.

[0029] Secondly, such as Figure 7As shown, the constraint member 2 also has a contact flange 24. A raised anti-slip structure 25 is provided on the contact surface of the contact flange 24. The raised anti-slip structure 25 includes several obliquely placed fan-shaped protrusions. The increased friction ensures the stability of the locking mechanism.

[0030] Both the internal elastic element 1 and the constraint element 2 are supported by metallic materials, such as spring steel or other steel materials.

[0031] Internal threads are provided on the axial inner wall of the inner elastic element 1.

[0032] like Figures 1-6 As shown, the inner wall of the constraint member 2 has a conical clearance hole 20 and a cylindrical clearance hole 21 connected in sequence, with the cylindrical clearance hole 21 connected to the small-diameter end of the conical clearance hole 20. The connection between the cylindrical clearance hole 21 and the conical clearance hole 20 can be either a circular arc surface or a corner edge.

[0033] This embodiment, for example, uses a circular arc surface, which can disperse stress and is easy to process and manufacture.

[0034] Furthermore, when the inner elastic member 1 contacts the connection 23 of the cylindrical clearance hole 21 and the conical clearance hole 20 in the constraint member 2 and is in the locked position, a conical space 101 is formed between the outer conical surface 100 of the inner elastic member 1 and the conical clearance hole 20, and at least a portion of the inner elastic member 1 extends into the cylindrical clearance hole 21, and the cylindrical clearance hole 21 and the outer wall of the inner elastic member 1 form an end conical space 102 with a taper opposite to that of the conical space 101.

[0035] like Figures 1-6 As shown, this embodiment provides a conical clearance hole 20 and a cylindrical clearance hole 21, both of which form spaces with the outer wall of the inner elastic member 1, such as a conical space 101 and an end conical space 102. The existence of these spaces can significantly reduce the frictional resistance during the process of the inner elastic member 1 being screwed into the screw. At the same time, because of the existence of these spaces, when the inner elastic member 1 contacts the connection between the cylindrical clearance hole 21 and the conical clearance hole 20 in the constraint member 2, the contact between the two is only partial and partial, which can achieve the purpose of preventing loosening and locking by radial contraction and axial tightening. Furthermore, the end conical space 102 can also form an outward expansion of at least a portion of the inner elastic member 1 beyond the connection. In other words, with the above design of this embodiment, the pitch of the internal thread of the inner elastic member 1 at the connection is reduced to the minimum, while the two ends of the portion with the minimum pitch of the inner elastic member 1 form a relatively large pitch, achieving a true purpose of preventing loosening.

[0036] If the elastic segment of the inner elastic element 1 is divided into three parts, the first part extends beyond the connection, the second part is within the connection, and the third part does not extend beyond the connection, arranged in terms of pitch: the pitch of the third part is greater than the pitch of the first part, and the pitch of the first part is greater than the pitch of the second part. In this state, because the pitch of the third part and the pitch of the first part are both greater than the pitch of the second part, the purpose of preventing thread loosening can be achieved.

[0037] The first part can be understood as a short section of the end conical space 102 formed by the outer wall of the inner elastic element 1 and the cylindrical clearance hole 21, because the cylindrical clearance hole 21 is to release the restriction on the outer wall of the inner elastic element 1.

[0038] In a preferred embodiment, the inner elastic element 1 is inserted into one end face of the cylindrical clearance hole 21 and the end face of the cylindrical clearance hole 21 away from the conical clearance hole 20 are left with an end distance L1. The existence of the end distance L1 can provide sufficient installation space for the inner elastic element 1 and can also prevent external parts from contacting the inner elastic element 1, which could lead to improper installation or contact with the inner elastic element 1, which could cause an axial force to drive the inner elastic element 1 to loosen.

[0039] In a preferred embodiment, the inner elastic element 1 and the connection point are in surface-to-surface contact. For example, the inner elastic element 1 may have an outer conical surface, while the connection point is an arc surface. The outer conical surface always maintains partial contact with the arc surface. Alternatively, the inner elastic element 1 and the connection point may be in surface-to-point contact. The point is a corner or edge. That is, the connection point between the cylindrical clearance hole 21 and the conical clearance hole 20 can be either an arc surface or a corner or edge.

[0040] Example 2

[0041] Based on Embodiment 1, this embodiment further discloses the following structure: Figures 1-6 As shown, the portion of the inner elastic member 1 inserted into the conical clearance hole 20 is the elastic part 10, and the remaining portion is the polygonal part 11. The elastic part 10 includes a plurality of circumferentially distributed arc-shaped elastic blocks 10a, and a pressure-reducing groove 10b is formed between adjacent arc-shaped elastic blocks 10a. Furthermore, in this embodiment, the axial length of the conical elastic part 10 is longer than the axial length of the constraint member 2. A chamfer 14 is provided at the distal end of the elastic part 10.

[0042] The depth of the pressure relief groove 10b is set according to actual requirements, such as half or all of the axial length of the elastic part 10.

[0043] Secondly, when the polygonal part 11 is in the locked position, there is a gap L2 between the end face of the elastic part 10 and the corresponding end face of the constraint member 2. The existence of the gap L2 can prevent the external part from contacting the constraint member 2 or the inner elastic member 1 and still have a certain adaptive elastic locking space. Of course, it is also to prevent the surface from contacting each other and causing loosening during resonance.

[0044] In addition, the constraint member 2 has a polygonal circumferential surface 22 in the circumferential direction, such as a hexagonal surface.

[0045] Example 3

[0046] like Figures 1-6 As shown, based on Embodiment 1 and Embodiment 2, this embodiment discloses an installation method for a lock nut kit, the installation method including the following steps: S1. Fit the constraint piece 2 onto the threaded part of the screw; S2, so that the elastic part 10 of the inner elastic member 1 is inserted into the conical clearance hole 20 of the constraint member 2 and a conical space 101 is formed between the outer conical surface 100 of the inner elastic member 1 and the conical clearance hole 20. The internal thread of the inner elastic member 1 is helically connected to the thread of the screw by the rotational driving force. When the elastic part 10 contacts the connection between the cylindrical clearance hole 21 and the conical clearance hole 20, the elastic part 10 contracts radially. When the inner elastic member 1 is in the locked position, at least a portion of the inner elastic member 1 extends into the cylindrical clearance hole 21, and the cylindrical clearance hole 21 and the outer wall of the inner elastic member 1 form an end conical space 102 with a taper opposite to that of the conical space 101. A conical clearance hole 20 and a cylindrical clearance hole 21 are provided, both of which form spaces with the outer wall of the inner elastic member 1, such as a conical space 101 and an end conical space 102. The existence of these spaces can significantly reduce the frictional resistance during the process of the inner elastic member 1 being screwed into the screw. At the same time, because of the existence of these spaces, when the inner elastic member 1 contacts the connection between the cylindrical clearance hole 21 and the conical clearance hole 20 in the constraint member 2, the contact between the two is only partial and partial, which can achieve the purpose of preventing loosening and locking by radial contraction and axial tightening. Furthermore, the end conical space 102 can also form an outward expansion of at least a portion of the inner elastic member 1 beyond the connection. In other words, with the above design in this embodiment, the pitch of the internal thread of the inner elastic member 1 at the connection is reduced to the minimum, while the two ends of the portion of the inner elastic member 1 with the minimum pitch form a relatively large pitch, achieving a true purpose of preventing loosening.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A lock nut kit, comprising an internal elastic element (1) having internal threads, and a constraint element (2) constrained to at least a portion of said internal elastic element (1) thereby forcing a change in the pitch of said internal threads, characterized in that, The inner wall of the constraint member (2) has a conical clearance hole (20) and a cylindrical clearance hole (21) connected in sequence. The cylindrical clearance hole (21) is connected to the small diameter end of the conical clearance hole (20). When the inner elastic member (1) contacts the connection between the cylindrical clearance hole (21) and the conical clearance hole (20) in the constraint member (2) and is in the locked position, a conical space (101) is formed between the outer conical surface (100) of the inner elastic member (1) and the conical clearance hole (20). At least a portion of the inner elastic member (1) extends into the cylindrical clearance hole (21), and the cylindrical clearance hole (21) and the outer wall of the inner elastic member (1) form an end conical space (102) with a taper opposite to that of the conical space (101).

2. The anti-loosening nut kit according to claim 1, characterized in that, The inner elastic element (1) is inserted into one end face of the cylindrical clearance hole (21) and there is an end distance (L1) between the cylindrical clearance hole (21) and the end face of the cylindrical clearance hole (21) away from the conical clearance hole (20).

3. The anti-loosening nut kit according to claim 1, characterized in that, The internal elastic element (1) and the connection point are in surface-to-surface contact.

4. The anti-loosening nut kit according to claim 1, characterized in that, The internal elastic element (1) and the connection point are in surface-to-point contact.

5. The anti-loosening nut kit according to claim 1, characterized in that, The connection between the cylindrical clearance hole (21) and the conical clearance hole (20) can be either an arc surface or a corner edge.

6. The anti-loosening nut kit according to claim 1, characterized in that, The portion of the inner elastic element (1) inserted into the conical clearance hole (20) is the elastic part (10), and the remaining portion is the polygonal part (11).

7. The anti-loosening nut kit according to claim 6, characterized in that, The elastic part (10) includes a plurality of circumferentially distributed arc-shaped elastic blocks (10a), and a pressure relief groove (10b) is formed between two adjacent arc-shaped elastic blocks (10a).

8. The anti-loosening nut kit according to claim 7, characterized in that, When the polygonal part (11) is in the locked position, there is a gap (L2) between the end face of the elastic part (10) and the corresponding end face of the constraint member (2).

9. The anti-loosening nut kit according to claim 1, characterized in that, The constraint member (2) has a polygonal circumferential surface (22) in the circumferential direction.

10. The method for installing the anti-loosening nut kit as described in any one of claims 1-9, characterized in that, The installation method includes the following steps: S1. Fit the constraint member (2) onto the threaded part of the screw; S2, such that the elastic part (10) of the inner elastic member (1) is inserted into the conical clearance hole (20) of the constraint member (2) and a conical space (101) is formed between the outer conical surface (100) of the inner elastic member (1) and the conical clearance hole (20). The internal thread of the inner elastic member (1) is helically connected to the thread of the screw by the rotational driving force. When the elastic part (10) contacts the connection between the cylindrical clearance hole (21) and the conical clearance hole (20), the elastic part (10) contracts radially. When the inner elastic member (1) is in the locked position, at least a portion of the inner elastic member (1) extends into the cylindrical clearance hole (21), and the outer wall of the cylindrical clearance hole (21) and the inner elastic member (1) form an end conical space (102) with a taper opposite to that of the conical space (101).

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