Anti-loose and anti-disengagement fastening assembly for railway vehicle

Abstract

The utility model belongs to the technical field of fastening assemblies, and relates to an anti-loose and anti-drop fastening assembly for railway vehicles, which comprises a bolt, a gasket and a fastener, the gasket is arranged on the lower portion of a nut of the bolt, and the fastener is arranged in the nut; an inner cavity and a conical cavity which are communicated up and down are formed in the bolt, the inner cavity is cylindrical and is coaxial with a stud of the bolt, and internal threads are arranged on the side walls of the inner cavity and the conical cavity; the upper end of the inner cavity penetrates through the nut, the lower end of the conical cavity penetrates through the stud, and a plurality of vertical through grooves are formed in the stud connected with the conical cavity; the fasteners are arranged in the inner cavity and the conical cavity; the fastener comprises a straight screw and a conical screw, the length of the straight screw is larger than that of the inner cavity, the straight screw is matched with the inner cavity, and the conical screw is matched with the conical cavity. The bolt and the screw hole of the connecting piece are expanded, so that the connecting stability of the bolt and the connecting piece is improved, and the bolt is prevented from loosening and falling off.

Description

Technical Field

[0001] This utility model belongs to the field of fastening component technology, and in particular relates to an anti-loosening and anti-detachment fastening component for rail vehicles. Background Technology

[0002] Rail vehicles experience significant and frequent vibrations during operation, placing extremely stringent requirements on the fastening components used. These components must ensure that connected parts remain tightly sealed at all times, effectively preventing loosening due to vibration, thereby guaranteeing the stable operation and safe travel of the rail vehicle.

[0003] However, most of the fastening components used in existing rail vehicles are connected using traditional bolts. Because bolts are prone to loosening due to reduced friction under long-term vibration, their anti-loosening and anti-derailment capabilities are insufficient, making it difficult to continuously and reliably meet the needs of rail vehicles under complex operating conditions. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-loosening and anti-detachment fastening component for rail vehicles to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A fastening assembly for rail vehicles that prevents loosening and detachment includes: a bolt, a washer, and a fastener, wherein the washer is provided at the lower part of the nut of the bolt, and the fastener is provided inside the bolt;

[0007] The bolt has an internal cavity and a conical cavity that are connected vertically. The internal cavity is cylindrical and coaxial with the stud of the bolt. Both the internal cavity and the conical cavity have internal threads on their sidewalls. The upper end of the internal cavity passes through the nut, and the lower end of the conical cavity passes through the stud. The stud connected to the conical cavity has multiple vertical through slots. The fastener is located inside the internal cavity and the conical cavity.

[0008] The fastener includes a straight screw and a tapered screw. The length of the straight screw is greater than the length of the inner cavity and is adapted to the inner cavity. The tapered screw is adapted to the tapered cavity.

[0009] As a further improvement of this utility model, the inner cavity includes a first cavity and a second cavity, the first cavity being located inside the nut and the second cavity being located inside the stud, and the diameter of the first cavity being larger than the diameter of the second cavity;

[0010] The upper part of the straight screw is provided with a connector that is adapted to the first cavity.

[0011] As a further improvement of this utility model, the upper part of the connector is provided with an internal hexagonal groove.

[0012] As a further improvement of this utility model, it also includes a nut, which is threaded onto the outer wall of the stud.

[0013] As a further improvement of this utility model, two nuts are arranged vertically side by side.

[0014] As a further improvement of this utility model, the lower part of the nut is provided with a groove with an arc-shaped cross-section, and the groove extends through the length of the nut;

[0015] The stud and the fastener are provided with a slot, the width of which is equal to the width of the slot; the slot and the slot are connected by a locking pin passing through them.

[0016] As a further improvement of this utility model, the upper part of the nut is provided with an internal hexagonal groove II, and the diameter of the inner cavity is smaller than the diameter of the inscribed circle of the internal hexagonal groove II.

[0017] As a further improvement of this utility model, both ends of the nut are provided with connecting holes, and the two ends of the connecting holes respectively penetrate the top and side wall of the nut.

[0018] The beneficial effects of adopting the above technical solution are as follows:

[0019] This invention features a fastener inside the bolt with a through groove at the bottom. The fastener is threaded into the bolt. The through groove causes the lower part of the fastener to push open the lower part of the bolt, causing the lower part of the stud to expand away from its axis and tighten against the threaded hole of the connector. The bolt and connector are connected by meshing threads and by tightening against the threaded hole, increasing the stability of the connection and ensuring a stable connection even under long-term vibration, thus preventing the bolt from loosening or falling off. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another angle;

[0022] Figure 3 This is a schematic diagram of the bolt structure of this utility model;

[0023] Figure 4 This is a cross-sectional view of the bolt of this utility model;

[0024] Figure 5 This is a schematic diagram of the fastener structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of this utility model in use;

[0026] The markings in the diagram are as follows: 1 Bolt, 1-1 Nut, 1-2 Stud, 1-3 Through slot, 1-4 Hex socket slot 2, 1-5 Connecting hole, 2 Washer, 3 Inner cavity, 4 Tapered cavity, 5 Straight screw, 6 Tapered screw, 7 Connector, 8 Hex socket slot 1, 9 Nut, 10 Slot, 11 Groove, 12 Locking pin. Detailed Implementation

[0027] To better understand the purpose, structure, and function of this utility model, a clear and complete description of this utility model will be provided below in conjunction with the accompanying drawings.

[0028] like Figures 1-6 The diagram shows an anti-loosening and anti-detachment fastening assembly for rail vehicles, comprising: a bolt 1, a washer 2, and a fastener; wherein the bolt 1 includes a nut 1-1 and a stud 1-2, the washer 2 is provided at the lower part of the nut 1-1 of the bolt 1, and the fastener is provided inside; in this embodiment, the washer 2 adopts a spring washer structure and is placed between the nut 9 and the connector. When the nut 9 is tightened, the spring washer is compressed and generates a continuous elastic force, so that the threaded connection between the nut 9 and the bolt 1 maintains a continuous frictional force, generating a resistance torque to prevent the nut 9 from loosening.

[0029] like Figure 4 As shown, the bolt 1 has an internal cavity 3 and a conical cavity 4 that are connected vertically. The internal cavity 3 is cylindrical and coaxial with the stud 1-2 of the bolt 1. Both the internal cavity 3 and the conical cavity 4 have internal threads on their side walls. The upper end of the internal cavity 3 passes through the nut 1-1, and the lower end of the conical cavity 4 passes through the stud 1-2. The stud 1-2 connected to the conical cavity 4 has multiple vertical through grooves 1-3, that is, the lower part of the stud 1-2 cooperates with the through grooves 1-3 to form an expansion sleeve. The fastener is located in the internal cavity 3 and the conical cavity 4. In this embodiment, the diameter of the inner cavity 3 is the same as the diameter of the upper part of the conical cavity 4. The inner cavity 3 includes a first cavity and a second cavity. The first cavity is located inside the nut 1-1, and the second cavity is located inside the stud 1-2. The diameter of the first cavity is larger than the diameter of the second cavity, that is, a step is formed between the first cavity and the second cavity, which facilitates the insertion of the fastener into the second cavity and is used to limit the fastener.

[0030] The fastener includes a straight screw 5 and a tapered screw 6. The length of the straight screw 5 is greater than the length of the inner cavity 3 and is adapted to the inner cavity 3. The tapered screw 6 is adapted to the tapered cavity 4, and the length of the tapered screw 6 is less than the length of the tapered cavity 4. Further, the upper part of the straight screw 5 is provided with a connector 7 adapted to the first cavity, and the length of the connector 7 is equal to the length of the first cavity.

[0031] In use, the washer 2 is placed under the nut 1-1, and the stud 1-2 is screwed into the threaded hole of the connector. Then, the fastener is inserted into the stud 1-2 and rotated, causing the tapered screw 6 to be located inside the tapered cavity 4. In the first state, the upper part of the tapered screw 6 is coplanar with the upper part of the tapered cavity 4, and the upper plane of the connector 7 is higher than the upper plane of the first cavity. Continuing to rotate the connector 7, under the action of the through groove 1-3, the stud 1-2 is placed in the second state. At this time, the upper plane of the tapered screw 6 is lower than the upper plane of the tapered cavity 4, the upper plane of the connector 7 is coplanar with the upper plane of the first cavity, and the expansion sleeve at the lower part of the stud 1-2 expands away from its axis, tightening against the threaded hole of the connector. That is, the bolt 1 and the connector are connected on one hand by meshing threads, and on the other hand by tightening against the threaded hole, increasing the connection stability between the bolt 1 and the connector, ensuring that the bolt 1 remains stably connected to the connector under long-term vibration, thereby preventing the bolt 1 from loosening and falling off.

[0032] To facilitate the rotation of the fastener, the upper part of the connector 7 is provided with an internal hexagonal groove 8, and force is applied to the connector 7 by using an internal hexagonal wrench. To facilitate the rotation of the bolt 1, the upper part of the nut 1-1 is provided with an internal hexagonal groove 1-4, and the diameter of the inner cavity 3 is smaller than the diameter of the inscribed circle of the internal hexagonal groove 1-4.

[0033] Furthermore, a rail vehicle anti-loosening and anti-detachment fastening assembly further includes a nut 9, which is threaded onto the outer wall of the stud 1-2, suitable for further fixing the bolt 1 when there is space at the bottom of the connector.

[0034] In one possible implementation, two nuts 9 are arranged vertically side by side. The first nut 9 is tightened to the required torque, and then the second nut 9 is tightened under the first nut 9 to prevent the bolt 1 from loosening. In another possible implementation, the lower part of the nut 9 is provided with a groove 10 with an arc-shaped cross-section, the groove 10 extending through the length of the nut 9; the stud 1-2 and the fastener are provided with a slot 11, the width of the slot 11 being equal to the width of the groove 10; the groove 10 and the slot 11 are connected by a locking pin 12 passing through them.

[0035] Furthermore, both ends of the nut 1-1 are provided with connecting holes 1-5, and the two ends of the connecting holes 1-5 respectively penetrate the top and side wall of the nut 1-1. This is suitable for situations where multiple bolts 1 are needed to fix the connector. In this case, adjacent connectors are connected by a steel wire rope passing through the connecting holes 1-5, so that multiple bolts 1 are connected in series and play a role in mutual restraint. When a bolt 1 is subjected to impact or vibration and tends to loosen, the steel wire will restrict its rotation, thereby achieving the purpose of preventing loosening.

[0036] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A fastening assembly for rail vehicles that prevents loosening and detachment, characterized in that: It includes: Bolt (1), washer (2) and fastener, wherein the nut (1-1) of the bolt (1) is provided with the washer (2) at the lower part and the fastener is provided inside; The bolt (1) has an internal cavity (3) and a conical cavity (4) that are connected vertically. The internal cavity (3) is cylindrical and coaxial with the stud (1-2) of the bolt (1). The side walls of the internal cavity (3) and the conical cavity (4) are provided with internal threads. The upper end of the internal cavity (3) passes through the nut (1-1), and the lower end of the conical cavity (4) passes through the stud (1-2). The stud (1-2) connected to the conical cavity (4) is provided with multiple vertical through slots (1-3). The fastener is provided in the internal cavity (3) and the conical cavity (4). The fastener includes a straight screw (5) and a tapered screw (6). The length of the straight screw (5) is greater than the length of the inner cavity (3) and is adapted to the inner cavity (3). The tapered screw (6) is adapted to the tapered cavity (4).

2. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 1, characterized in that: The inner cavity (3) includes a first cavity and a second cavity. The first cavity is located inside the nut (1-1), and the second cavity is located inside the stud (1-2). The diameter of the first cavity is larger than the diameter of the second cavity. The upper part of the straight screw (5) is provided with a connector (7) that is adapted to the first cavity.

3. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 2, characterized in that: The upper part of the connector (7) is provided with an internal hexagonal groove (8).

4. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 1, characterized in that: It also includes a nut (9) which is threaded onto the outer wall of the stud (1-2).

5. A rail vehicle anti-loosening and anti-detachment fastening assembly according to claim 4, characterized in that: Two nuts (9) are arranged vertically side by side.

6. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 4, characterized in that: The lower part of the nut (9) is provided with a groove (10) with an arc-shaped cross section, and the groove (10) extends through the length of the nut (9); The studs (1-2) and the fasteners are provided with slots (11), the width of which is equal to the width of the slot (10); the slot (10) and the slot (11) are connected by a locking pin (12) passing through them.

7. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 1, characterized in that: The upper part of the nut (1-1) is provided with an internal hexagonal groove 2 (1-4), and the diameter of the inner cavity (3) is smaller than the diameter of the inscribed circle of the internal hexagonal groove 2 (1-4).

8. The anti-loosening and anti-detachment fastening assembly for rail vehicles according to claim 1, characterized in that: Both ends of the nut (1-1) are provided with connecting holes (1-5), and the two ends of the connecting holes (1-5) respectively penetrate the top and side wall of the nut (1-1).

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