A self-locking mechanism

Abstract

This utility model discloses a self-locking mechanism, relating to the field of train seat technology. The self-locking mechanism includes a lock housing, a locking pin, an unlocking slider, a return spring, a steel cable, and a servo motor. The lock housing has a slider groove along its length and a locking pin groove communicating with the slider groove along its width. The unlocking slider slides within the slider groove, and symmetrically arranged inclined surfaces are located on opposite sides of the unlocking slider. The locking pin slides within the locking pin groove, and a guide locking groove intersecting the length direction of the locking pin is provided on the locking pin. The unlocking slider passes through the guide locking groove and slides in cooperation with the groove wall of the guide locking groove. This utility model, through the inclined surface cooperation design of the unlocking slider and the locking pin, converts the reverse force applied by the transmission system into a self-reinforcing locking force, achieving the safety characteristics of self-locking upon power failure and increasing reliability with stronger external force. The use of a toothed locking mechanism significantly improves shear resistance and positioning accuracy, offering comprehensive advantages such as simple structure, no need for continuous power supply, and high reliability.

Description

Technical Field

[0001] This utility model relates to the field of train seat technology, specifically to a self-locking mechanism. Background Technology

[0002] In precision transmission systems such as high-speed rail seats, to achieve reliable positioning of business class seats at multiple preset angles, it is necessary to effectively lock the gears or gear rings at the end of the transmission chain. Existing locking solutions generally have the following shortcomings: First, although electromagnetic brakes or friction pad brakes can achieve controllable locking, they may lose their locking ability when the power is off, posing a safety hazard. At the same time, these devices have complex structures and high costs, and the friction pairs are prone to wear and tear after long-term use, which can lead to a decrease in locking force and affect long-term reliability.

[0003] Secondly, although mechanical pin-type locking mechanisms can achieve rigid positioning, their locking pins are easily damaged by shear force or bending moment when directly subjected to the reverse impact load of the transmission chain. They have low reliability in long-term use and generally lack the safety feature of self-reinforcing locking force as the load increases.

[0004] Therefore, there is an urgent need in this field for a special mechanism that has a simple structure, can achieve safe locking without continuous power supply, and can convert the reverse force applied by the transmission components into a self-reinforcing locking force, so as to reliably lock the gear or gear ring and ensure the absolute stillness and safety of the system under complex working conditions.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a self-locking mechanism to solve the issues raised in the background section.

[0007] This utility model provides the following technical solution: a self-locking mechanism, comprising: a lock housing, a locking pin, an unlocking slider, a return spring, a steel cable, and a servo motor; The lock housing has a slider groove along its length and a locking pin groove communicating with the slider groove along its width. The unlocking slider slides within the slider groove, and the two opposite sides of the unlocking slider have symmetrically arranged bevels; The locking pin slides in the locking pin groove, and the locking pin is provided with a guide locking groove that intersects with the length direction of the locking pin. The unlocking slider passes through the guide locking groove and slides in cooperation with the groove wall of the guide locking groove. One end of the steel cable is fixedly connected to the unlocking slider, and the other end passes through the wall of the slider groove and is connected to the output end of the servo motor. The reset spring is located in the slider groove, with one end abutting against the groove wall and the other end abutting against the unlocking slider. It is used to provide an elastic force to the unlocking slider so that it tends to move away from the direction of the steel cable.

[0008] Preferably, the inclined surface of the unlocking slider is configured such that when the locking pin is subjected to an external force, the external force acts on the inclined surface of the unlocking slider through the groove wall of the guide lock groove, generating a positive pressure that presses the unlocking slider against the inner wall of the slider groove, thereby achieving self-locking.

[0009] Preferably, the end of the locking pin extending out of the locking pin groove is provided with multiple teeth.

[0010] Preferably, the inner sidewall of the lock case is an arc-shaped surface.

[0011] The lock case has mounting holes starting at its corners.

[0012] Preferably, the two ends of the unlocking slider are respectively provided with a stop block one and a stop block two.

[0013] The self-locking mechanism provided in this embodiment of the utility model has the following beneficial effects: By using the inclined surface cooperation design of the unlocking slider and the locking pin, the utility model transforms the reverse force applied by the transmission system into a self-reinforcing locking force, realizing the safety characteristics of self-locking when power is off and more reliable locking under stronger external force; at the same time, the tooth-meshing locking significantly improves the shear resistance and positioning accuracy, and has the comprehensive advantages of simple structure, no need for continuous power supply, and high reliability. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the present invention from angle one; Figure 2 This is a schematic diagram of the structure of this utility model from angle two; Figure 3 This is a schematic diagram of the structure of the present invention in conjunction with the gear ring for locking operation. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] See Figures 1-3 To address the problems mentioned in the background section, this utility model provides a self-locking mechanism to solve the aforementioned technical problems. The technical solution is as follows: A self-locking mechanism includes: a lock housing 110, a locking pin 120, an unlocking slider 130, a return spring 140, a steel cable 150, and a servo motor; wherein the structure of the servo motor is not shown. The lock housing 110 is provided with a slider groove 111 along its length direction and a locking pin groove 112 communicating with the slider groove 111 along its width direction. The unlocking slider 130 slides within the slider groove 111, and the two opposite sides of the unlocking slider 130 have symmetrically arranged inclined surfaces. The locking pin 120 slides in the locking pin groove 112. The locking pin 120 is provided with a guide locking groove 122 that intersects the length direction of the locking pin 120. The unlocking slider 130 passes through the guide locking groove 122 and slides in cooperation with the groove wall of the guide locking groove 122. One end of the steel cable 150 is fixedly connected to the unlocking slider 130, and the other end passes through the groove wall of the slider groove 111 and is connected to the output end of the servo motor. The reset spring 140 is disposed in the slider groove 111, with one end abutting against the groove wall of the slider groove 111 and the other end abutting against the unlocking slider 130, and is used to provide an elastic force to the unlocking slider 130 to make it move away from the direction of the steel cable 150.

[0017] In this embodiment, the inclined surface of the unlocking slider 130 is configured such that when the locking pin 120 is subjected to an external force, the external force acts on the inclined surface of the unlocking slider 130 through the groove wall of the guide lock groove 122, generating a positive pressure that presses the unlocking slider 130 against the inner wall of the slider groove 111, thereby achieving self-locking.

[0018] In this embodiment, the end of the locking pin 120 extending out of the locking pin groove 112 is provided with multiple teeth 121. The multiple teeth 121 provided at the end of the locking pin 120 serve to achieve mechanical interlocking through meshing with the external gear ring 200. This design transforms the traditional surface contact friction locking into toothed meshing locking, significantly improving shear resistance and locking reliability.

[0019] In this embodiment, the inner sidewall of the lock housing 110 is an arc-shaped surface 113; the inner side of the lock housing 110 specifically refers to the position on the same side as the tooth 121. The arc-shaped structure on the inner side of the lock housing 110 provides a smooth guide trajectory for the radial movement of the locking pin 120, ensuring that its end tooth 121 can accurately and without interference engage or disengage with the external gear ring.

[0020] In this embodiment, the lock housing 110 has mounting holes 114 at its corners. The mounting holes 114 at the corners of the lock housing 110 provide a standardized mechanical interface for the entire self-locking mechanism, ensuring that it can be reliably fixed to the target device base by bolts or other fasteners.

[0021] In this embodiment, two ends of the unlocking slider 130 are respectively provided with a first stop 131 and a second stop 132. The first stop 131 and the second stop 132 at both ends of the unlocking slider 130 constitute a bidirectional mechanical limiting structure.

[0022] The working process of a self-locking mechanism provided in this embodiment of the utility model is as follows: (1) Locking process: When the transmission system needs to be locked, the servo motor is de-energized, and the steel cable 150 loses tension. At this time, the elastic restoring force of the return spring 140 pushes the unlocking slider 130 to move away from the steel cable 150 in the slider groove 111 of the lock housing 110. During the movement, the inclined surfaces on both sides of the unlocking slider 130 interact with the groove wall of the guide lock groove 122 on the lock pin 120. The inclined surface action generates a radial component force, which pushes the lock pin 120 to extend outward along the lock pin groove 112, so that the teeth 121 at the end of the lock pin 120 are fully engaged with the external gear ring 200, thus completing the mechanical interlock.

[0023] (2) Self-reinforcing locking state: In the locking state, if the external gear ring 200 tends to rotate due to the external force on the transmission system, it will apply a tangential force to the teeth 121 of the locking pin 120. This force is transmitted to the inclined surface of the unlocking slider 130 through the groove wall of the guide lock groove 122, attempting to push the unlocking slider 130 to slide in the slider groove 111.

[0024] Due to the inclined surface of the unlocking slider 130, the greater the reaction force applied by the external gear ring 200, the greater the positive pressure generated by the inclined surface that presses the unlocking slider 130 against the inner wall of the slider groove 111. This increase in positive pressure directly leads to a synchronous increase in the static friction between the unlocking slider 130 and the inner wall of the slider groove 111, forming a positive feedback mechanism of "increased external force → automatically increased locking force." This design ensures that the unlocking slider 130 will not slide within the slider groove 111 when subjected to external force, thus achieving a self-reinforcing effect of tightening with each lock.

[0025] (3) Unlocking process: When it is necessary to unlock, the servo motor is powered on and outputs rotational motion, which pulls the unlocking slider 130 through the steel cable 150, causing it to overcome the elastic force of the return spring 140 and move towards the steel cable 150. As the unlocking slider 130 is displaced, the interaction between its inclined surface and the guide lock groove 122 is released, the locking pin 120 loses radial support, and under the action of the tooth surface of the outer gear ring 200, it retracts into the locking pin groove 112, disengages from the gear ring 200, and the transmission system thus returns to a free rotation state.

[0026] The self-locking mechanism provided in this embodiment of the utility model has the following beneficial effects: By using the inclined surface cooperation design of the unlocking slider and the locking pin, the utility model transforms the reverse force applied by the transmission system into a self-reinforcing locking force, realizing the safety characteristics of self-locking when power is off and more reliable locking under stronger external force; at the same time, the tooth-meshing locking significantly improves the shear resistance and positioning accuracy, and has the comprehensive advantages of simple structure, no need for continuous power supply, and high reliability.

[0027] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims.

Claims

1. A self-locking mechanism, characterized in that, include: Lock housing, locking pin, unlocking slider, return spring, steel cable, and servo motor; The lock housing has a slider groove along its length and a locking pin groove communicating with the slider groove along its width. The unlocking slider slides within the slider groove, and the two opposite sides of the unlocking slider have symmetrically arranged bevels; The locking pin slides in the locking pin groove, and the locking pin is provided with a guide locking groove that intersects with the length direction of the locking pin. The unlocking slider passes through the guide locking groove and slides in cooperation with the groove wall of the guide locking groove. One end of the steel cable is fixedly connected to the unlocking slider, and the other end passes through the wall of the slider groove and is connected to the output end of the servo motor. The reset spring is located in the slider groove, with one end abutting against the groove wall and the other end abutting against the unlocking slider. It is used to provide an elastic force to the unlocking slider so that it tends to move away from the direction of the steel cable.

2. The self-locking mechanism according to claim 1, characterized in that, The inclined surface of the unlocking slider is configured such that when the locking pin is subjected to an external force, the external force acts on the inclined surface of the unlocking slider through the groove wall of the guide lock groove, generating a positive pressure that presses the unlocking slider against the inner wall of the slider groove, thereby achieving self-locking.

3. The self-locking mechanism according to claim 1, characterized in that, The end of the locking pin that extends out of the locking pin groove has multiple teeth.

4. The self-locking mechanism according to claim 1, characterized in that, The inner sidewall of the lock case is curved.

5. The self-locking mechanism according to claim 1, characterized in that, The lock case has mounting holes starting at its corners.

6. The self-locking mechanism according to claim 1, characterized in that, The two ends of the unlocking slider are respectively equipped with a stop block one and a stop block two.

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