One-way self-locking mechanism, motor and linear actuator for rotating shaft

Abstract

The present invention discloses a one-way self-locking mechanism, a motor and a linear actuator applied to a rotating shaft, which belongs to the field of self-locking mechanisms and reduces the friction between the rotating shaft and the one-way self-locking mechanism when the rotating shaft rotates forward. The one-way self-locking mechanism applied to the rotating shaft of the present invention includes a friction pad arranged on the outer periphery of the rotating shaft, an extrusion member for extruding the friction pad and an extrusion gap for installing the extrusion member. The extrusion gap is arranged along the circumferential direction of the rotating shaft. The extrusion member can move relative to the friction pad in the extrusion gap when the rotating shaft rotates, so as to squeeze the friction pad when the rotating shaft is reversed so that the friction pad holds the rotating shaft tightly, and release the friction pad when the rotating shaft rotates forward.

Description

Technical field

[0001] The present invention relates to the field of self-locking mechanisms, and in particular to a one-way self-locking mechanism, a motor and a linear actuator applied to a rotating shaft. [Background Technology]

[0002] In most transmission machinery applications, the transmission components need to remain stationary when stopped to avoid movement due to external forces, such as the drive shaft of a motor. Therefore, it is necessary to add a self-locking mechanism in the transmission component to lock the transmission component. Although the self-locking structure can generate a self-locking force, if the self-locking force is also present during the normal operation of the transmission component, it will hinder the movement of the transmission component. The most ideal solution is to have a device that can self-lock in one direction, especially when applied to the shaft. The existing one-way self-locking mechanism is usually directly mounted on the shaft. The self-locking mechanism itself has the ability to retract toward the shaft. When the shaft rotates in the forward direction, there is a non-negligible friction between the self-locking mechanism and the shaft, which affects the transmission and also causes greater wear on the self-locking mechanism. [Summary of the invention]

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and propose a one-way self-locking mechanism applied to a rotating shaft, thereby reducing the friction between the rotating shaft and the one-way self-locking mechanism during forward rotation.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A one-way self-locking mechanism applied to a rotating shaft includes a friction pad arranged on the outer periphery of the rotating shaft, an extrusion member for squeezing the friction pad, and an extrusion gap for installing the extrusion member. The extrusion gap is arranged along the circumferential direction of the rotating shaft. The extrusion member can move relative to the friction pad in the extrusion gap when the rotating shaft rotates, so as to squeeze the friction pad when the rotating shaft reverses so that the friction pad holds the rotating shaft tightly, and release the friction pad when the rotating shaft rotates forward.

[0006] Based on the above solution, the self-locking mechanism also includes a shell mounted on the rotating shaft, the shell having a cavity for accommodating the extrusion member and the friction pad, and the extrusion gap is formed between the side wall of the cavity and the outer side wall of the friction pad.

[0007] Based on the above solution, the outer side wall of the friction pad gradually approaches the axis of the rotating shaft in the reverse direction of the rotating shaft.

[0008] On the basis of the above solution, the rotating shaft contacts the friction pad to drive the friction pad to move relative to the extrusion member, and the one-way self-locking mechanism further includes a locking protrusion for stopping the friction pad.

[0009] Based on the above solution, the extrusion member is a roller that contacts the outer side wall of the friction pad and can rotate relative to the friction pad. The roller contacts the side wall of the cavity to roll along the side wall of the cavity when rotating.

[0010] Based on the above scheme, the locking protrusion includes a first protrusion arranged on the side wall of the cavity and a second protrusion arranged on the outer wall of the friction pad. The first protrusion is used to stop the extrusion part, and the second protrusion is abutted against the extrusion part to stop the friction pad.

[0011] Based on the above scheme, the extrusion member includes a first pin fixed on the shell and a roller rotatably mounted on the first pin, and the roller contacts the outer wall of the friction pad to rotate relative to the friction pad when the friction pad rotates with the rotating shaft.

[0012] On the basis of the above solution, both ends of the friction pad in the circumferential direction of the rotating shaft protrude toward the side wall of the cavity to form the blocking protrusions, and the blocking protrusions abut against the extrusion member to stop the friction pad.

[0013] On the basis of the above scheme, the self-locking mechanism also includes a shell, which has a cavity for accommodating the extrusion piece and the friction pad. The two end faces of the friction pad in the axial direction of the rotating shaft are arranged to pass through to form the extrusion gap. The rotating shaft contacts the friction pad to drive the friction pad to move relative to the extrusion piece, and the extrusion piece is fixedly arranged on the shell.

[0014] Based on the above solution, the extrusion member maintains contact with the side wall of the extrusion gap close to the rotating shaft, and the side wall of the extrusion gap close to the rotating shaft gradually approaches the axis of the rotating shaft in the reverse direction of the rotating shaft.

[0015] Based on the above scheme, the self-locking mechanism also includes a ring that can be rotatably mounted on the rotating shaft. The friction pads are provided in plurality and are rotatably mounted on the ring through a second pin shaft. The rotating shaft contacts the friction pads to drive the friction pads to move relative to the extrusion member.

[0016] On the basis of the above scheme, there are multiple friction pads and extrusion parts, and the self-locking mechanism also includes a ring, and a slot is provided on the friction pad. The ring and the slot cooperate to keep the rotating shaft in contact with the multiple friction pads to drive the multiple friction pads to move relative to the multiple extrusion parts.

[0017] On the basis of the above scheme, the friction tiles and the extrusion parts are provided in plurality, one end of the friction tile is provided with a snap buckle, and the other end of the friction tile is provided with a buckle block, and the multiple friction tiles are connected end to end through the snap engagement of the snap buckle and the buckle block, so that the rotating shaft maintains contact with the multiple friction tiles to drive the multiple friction tiles to move relative to the multiple extrusion parts.

[0018] Based on the above solution, a plurality of friction protrusions are arranged at intervals on the inner side wall of the friction pad in the circumferential direction of the rotating shaft.

[0019] A motor comprises an output shaft and a self-locking mechanism disclosed in any of the above technical solutions, wherein the self-locking mechanism is used to self-lock the output shaft.

[0020] A linear actuator includes the motor disclosed in the above technical solution.

[0021] Beneficial effects of the present invention:

[0022] The one-way self-locking mechanism disclosed in the present invention is applied to a rotating shaft and can realize one-way self-locking of the rotating shaft. The friction pad can apply a braking force to the rotating shaft, and the braking force is the friction between the friction pad and the rotating shaft. As the rotating shaft rotates, the extrusion piece can move within the extrusion gap. When the rotation direction of the rotating shaft is different, the direction in which the extrusion piece moves relative to the friction pad is different. When the rotating shaft rotates in the forward direction, the extrusion piece will not squeeze the friction pad, and the friction pad itself does not have the force to clamp the rotating shaft, so that the friction between the friction pad and the rotating shaft is at the lowest value, thereby not affecting the forward rotation of the rotating shaft. When the rotating shaft rotates in the reverse direction, the extrusion piece can squeeze the friction pad, increase the relative force between the friction pad and the rotating shaft, and increase the friction between the two, thereby locking the rotating shaft.

[0023] In the prior art, one-way self-locking is typically achieved by a friction ring mounted on the rotating shaft. The friction ring naturally grips the rotating shaft. When the rotating shaft rotates in the forward direction, the friction ring continuously expands outward due to friction, and then recovers due to its own elastic force. This repeated change causes the rotating shaft to be subjected to considerable friction, and the friction ring also experiences significant wear. Compared to the prior art, the friction pads of the present application do not naturally grip the rotating shaft, and the extrusion member does not squeeze the friction pads when the rotating shaft rotates in the forward direction. Therefore, the friction between the friction pads and the rotating shaft is negligible, allowing the rotating shaft to rotate more smoothly.

[0024] The friction pads can be made of materials with a high friction coefficient to increase the braking force between the pads and the rotating shaft. When the friction pads are worn, the extrusion piece can still squeeze the friction pads to make them hold the rotating shaft tightly, and the braking force will not change significantly.

[0025] Furthermore, the self-locking mechanism includes a housing mounted on the rotating shaft, the housing having a cavity for accommodating the extrusion member and the friction pad, with the extrusion gap formed between the sidewall of the cavity and the outer wall of the friction pad. The extrusion member can compress the outer wall of the friction pad, exerting a force on the friction pad in the radial direction of the rotating shaft, thereby directly increasing the relative force between the friction pad and the rotating shaft.

[0026] Furthermore, the outer wall of the friction pad gradually approaches the axis of the rotating shaft in the reverse direction of the rotating shaft. In the reverse direction of the rotating shaft, the distance between the outer wall of the friction pad and the side wall of the cavity continuously increases, thereby forming an extrusion gap whose thickness gradually increases along the reverse direction of the rotating shaft (the thickness here refers to the size of the extrusion gap in the radial direction of the rotating shaft). When the rotating shaft reverses, the extrusion member moves from a position of greater thickness to a position of less thickness within the extrusion gap relative to the friction pad. As the extrusion member moves relative to the friction pad, it continuously squeezes the friction pad, thereby increasing the braking force between the friction pad and the rotating shaft.

[0027] Furthermore, the rotating shaft contacts the friction pad to drive the friction pad to move relative to the extrusion member, and the one-way self-locking mechanism also includes a locking protrusion for stopping the friction pad. The friction pad remains in contact with the rotating shaft, so that friction can be generated between the rotating shaft and the friction pad during forward or reverse rotation, so that the friction pad can rotate with the rotating shaft. The locking protrusion can limit the friction pad from further rotation after the friction pad rotates a certain angle with the rotating shaft, and keep the extrusion member within the extrusion gap, so that the friction pad is maintained at the position with the minimum braking force on the rotating shaft when the rotating shaft rotates forward, and is maintained at the position with the maximum braking force on the rotating shaft when the rotating shaft rotates reversely.

[0028] Furthermore, the extrusion member is a roller that contacts the outer side wall of the friction pad and can rotate relative to the friction pad, and the roller contacts the side wall of the cavity to roll along the side wall of the cavity during rotation.

[0029] When the rotating shaft rotates, the friction pads can rotate with the rotating shaft under the action of friction, and the friction between the pads and the extrusion parts drives the extrusion parts to rotate relative to the friction pads. Under the action of the friction between the extrusion parts and the side walls of the cavity, the extrusion parts can roll along the side walls of the cavity during rotation, reducing the friction between the pads and the friction pads to reduce wear, thereby avoiding slipping between the friction pads and the extrusion parts when the rotating shaft reverses due to excessive wear, resulting in insufficient braking force. When the rotating shaft reverses, as the rotating shaft rotates, the extrusion force between the extrusion parts and the friction pads gradually increases, driving the extrusion parts to roll along the side walls of the cavity. The relative force between the friction pads and the rotating shaft also continues to increase, thereby increasing the friction between the friction pads and the rotating shaft after being stopped by the protrusion.

[0030] Furthermore, the locking protrusion includes a first protrusion provided on the side wall of the cavity and a second protrusion provided on the outer wall of the friction pad. The first protrusion is used to stop the extrusion member, and the second protrusion abuts against the extrusion member to stop the friction pad. The first protrusion can abut against the extrusion member during its rotation to limit the extrusion member from sliding further along the side wall of the cavity. The second protrusion can abut against the extrusion member after the extrusion member is stopped by the first protrusion to limit the friction pad from continuing to rotate along the rotating shaft.

[0031] Furthermore, the extrusion member includes a first pin fixed to the housing and a roller rotatably mounted on the first pin. The roller contacts the outer wall of the friction pad so as to rotate relative to the friction pad when the friction pad rotates with the rotating shaft. When the rotating shaft rotates, the friction pad rotates with the rotating shaft under the action of friction force, and the friction between the friction pad and the roller drives the roller to rotate relative to the first pin.

[0032] Furthermore, the friction pads have two ends in the circumferential direction of the rotating shaft that protrude toward the sidewalls of the cavity to form the retaining protrusions, which abut against the extrusion to stop the friction pads. The extrusion is fixed in position within the cavity, and as the friction pads move within the cavity, the retaining protrusions gradually approach the extrusion and, after abutting against the extrusion, restrict the friction pads from further rotation.

[0033] Furthermore, the self-locking mechanism further comprises a housing having a cavity for accommodating the extrusion member and the friction pad. The friction pad is provided on both end faces of the rotating shaft in the axial direction to form the extrusion gap. The rotating shaft contacts the friction pad to drive the friction pad to move relative to the extrusion member. The extrusion member is fixedly mounted on the housing. The friction pad maintains contact with the rotating shaft, so that friction can be generated between the rotating shaft and the friction pad when the rotating shaft rotates forward or reverse, so that the friction pad can rotate with the rotating shaft. The extrusion member is fixed in position in the cavity. As the friction pad moves within the cavity, the end position of the extrusion gap can abut against the extrusion member to limit the friction pad from further rotation, thereby maintaining the friction pad at a position with minimum braking force on the rotating shaft when the rotating shaft rotates forward, and maintaining the friction pad at a position with maximum braking force on the rotating shaft when the rotating shaft rotates reversely.

[0034] Furthermore, the extrusion member maintains contact with the side wall of the extrusion gap near the rotating shaft, and the side wall of the extrusion gap near the rotating shaft gradually approaches the axis of the rotating shaft in the reverse direction of the rotating shaft. The extrusion gap is close to the side wall of the rotating shaft, and the distance between the extrusion member and the axis of the rotating shaft continuously decreases in the reverse direction of the rotating shaft, while the distance between the extrusion member and the axis of the rotating shaft is fixed. When the rotating shaft reverses, the friction pad is deformed toward the rotating shaft under the extrusion of the extrusion member, so that the friction pad can move relative to the extrusion member.

[0035] Furthermore, the self-locking mechanism includes a collar rotatably mounted on the rotating shaft. A plurality of friction pads are rotatably mounted on the collar via a second pin. The rotating shaft contacts the friction pads to drive the friction pads relative to the extrusion member. When the rotating shaft rotates, the friction pads rotate with the rotating shaft under the action of friction. The collar positions the plurality of friction pads, ensuring that the plurality of friction pads remain positioned around the rotating shaft and in contact with the rotating shaft. The collar also defines the spacing between the plurality of friction pads. When a friction pad rotates with the rotating shaft, the friction pad also drives the collar to rotate, allowing the plurality of friction pads to rotate synchronously relative to the rotating shaft. The friction pads rotate relative to the collar via the second pin, moving closer to or further away from the rotating shaft. When the friction pads approach the rotating shaft, the relative force between the friction pads increases, while when the friction pads move away from the rotating shaft, the relative force between the friction pads decreases.

[0036] Furthermore, the friction pads and the extrusion members are provided in plurality, and the self-locking mechanism further includes a collar, wherein the friction pads are provided with a slot. The collar and the slot cooperate to maintain contact between the rotating shaft and the plurality of friction pads, thereby driving the plurality of friction pads to move relative to the plurality of extrusion members. When the collar and the slot cooperate, the spacing between the friction pads and the rotating shaft is limited, so that the plurality of friction pads can maintain contact with the rotating shaft. At the same time, the plurality of friction pads can also move synchronously with the rotating shaft under the action of the collar.

[0037] Furthermore, the friction pads and the extrusion members are provided in plurality, one end of the friction pads is provided with a buckle, and the other end of the friction pads is provided with a buckle block, and the plurality of friction pads are connected end to end by the buckle engagement with the buckle block, so that the rotating shaft maintains contact with the plurality of friction pads to drive the plurality of friction pads to move relative to the plurality of extrusion members. The plurality of friction pads can be connected end to end by the engagement of the buckle and the buckle block, so that the plurality of friction pads are connected into a whole, so that the plurality of friction pads can move synchronously with the rotating shaft, and the engagement of the buckle and the buckle block defines the spacing between the friction pads and the rotating shaft, so that the plurality of friction pads can maintain contact with the rotating shaft.

[0038] The present invention also discloses a motor, which outputs rotational power through a drive shaft. The self-locking structure disclosed above is arranged outside the drive shaft to perform one-way self-locking on the drive shaft.

[0039] The present invention also discloses a linear actuator, which can output power in a straight line direction and is usually used in some lifting platforms. The linear actuator adopts the above-mentioned motor to provide power. In this way, the self-locking mechanism of the linear actuator will not affect the power output of the drive shaft when driving the lifting platform to rise. When the lifting platform remains stationary, the gravity of the lifting platform under the action of the self-locking mechanism will not cause the rotating shaft to reverse and cause the lifting platform to descend. Although the friction pads will apply considerable braking force to the rotating shaft only after the driving shaft rotates a certain angle, the position of the lifting platform will hardly change even if the driving shaft rotates a full circle, and the friction pads only need the driving shaft to rotate a certain angle to take effect.

[0040] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0041] The present invention will be further described below with reference to the accompanying drawings:

[0042] Figure 1 This is a structural diagram of a one-way self-locking mechanism in an embodiment of the present invention;

[0043] Figure 2 An exploded view of a one-way self-locking mechanism in an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of the structure of a one-way self-locking mechanism with another extrusion member in an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of the connection of a one-way self-locking mechanism in which the extruded member is a gear in an embodiment of the present invention;

[0046] Figure 5 Schematic diagram of the structure of the friction tile in an embodiment of the present invention;

[0047] Figure 6 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0048] Figure 7 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0049] Figure 8 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0050] Figure 9 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0051] Figure 10 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0052] Figure 11 Schematic diagram of the structure of another friction tile in an embodiment of the present invention;

[0053] Figure 12 This is a structural diagram of another one-way self-locking mechanism in an embodiment of the present invention;

[0054] Figure 13 Schematic diagram of the structure of a one-way self-locking mechanism with another positioning member in an embodiment of the present invention;

[0055] Figure 14 for Figure 13 Exploded diagram of the one-way self-locking mechanism;

[0056] Figure 15 Schematic diagram of the structure of a one-way self-locking mechanism with another positioning member in an embodiment of the present invention.

[0057] Reference numerals:

[0058] Rotation axis 100;

[0059] Housing 200, cavity 210;

[0060] Friction tile 300, opening 310, fixed end 320, free end 330, elastic member 340, friction protrusion 350;

[0061] Extrusion 400;

[0062] Extrusion gap 500;

[0063] The locking protrusion 600, the first protrusion 610, and the second protrusion 620;

[0064] Positioning member 700 , slot 710 , protrusion 711 , braking surface 712 , buckle 720 , buckle block 730 . [Specific implementation method]

[0065] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0066] When used herein, words such as "exemplary" and "some embodiments" mean "serving as an example, embodiment, or illustration." Any embodiment described as "exemplary" is not necessarily to be construed as superior or preferable to other embodiments. Numerous specific details are provided in the following detailed description to better illustrate the present invention. However, those skilled in the art will appreciate that the present disclosure may be practiced without these specific details.

[0067] Reference Figures 1 to 4 The embodiment of the present invention discloses a one-way self-locking mechanism applied to a rotating shaft, including a shell 200 mounted on the rotating shaft 100, the shell 200 having a cavity 210, a friction pad 300 arranged on the outer periphery of the rotating shaft 100, an extrusion member 400 for extruding the friction pad 300, and an extrusion gap 500 for installing the extrusion member 400, the extrusion gap 500 being arranged along the circumferential direction of the rotating shaft 100, the extrusion member 400 can move relative to the friction pad 300 in the extrusion gap 500 when the rotating shaft 100 rotates, so as to squeeze the friction pad 300 when the rotating shaft 100 is reversed so that the friction pad 300 holds the rotating shaft 100 tightly, and release the friction pad 300 when the rotating shaft 100 rotates forward.

[0068] The one-way self-locking mechanism disclosed in the present invention is applied to a rotating shaft 100, achieving one-way self-locking of the rotating shaft 100. The friction pad 300 can apply a braking force to the rotating shaft 100, which is the friction between the friction pad 300 and the rotating shaft 100. As the rotating shaft 100 rotates, the extrusion member 400 can move within the extrusion gap 500. The extrusion member 400 moves in different directions relative to the friction pad 300 depending on the rotation direction of the rotating shaft 100. When the rotating shaft 100 rotates in the forward direction, the extrusion member 400 does not squeeze the friction pad 300, keeping the friction between the friction pad 300 and the rotating shaft 100 at a minimum, thereby not affecting the forward rotation of the rotating shaft 100. When the rotating shaft 100 rotates in the reverse direction, the extrusion member 400 squeezes the friction pad 300, increasing the relative force between the friction pad 300 and the rotating shaft 100 and the friction between them, thereby locking the rotating shaft 100.

[0069] In the prior art, one-way self-locking is typically achieved by a friction ring mounted on the rotating shaft. The friction ring naturally grips the rotating shaft. When the rotating shaft rotates in the forward direction, the friction ring continuously expands outward under the action of friction, and then recovers due to its own elastic force after expansion. This repeated change causes the rotating shaft to still be subjected to considerable friction, and the friction ring also suffers significant wear. Compared to the prior art, the friction pad 300 of the present application does not naturally grip the rotating shaft 100, and the extrusion member 400 does not squeeze the friction pad 300 when the rotating shaft 100 rotates in the forward direction. Therefore, the friction between the friction pad 300 and the rotating shaft 100 is negligible, and the rotating shaft 100 can rotate more smoothly.

[0070] The friction pads 300 can be made of a material with a large friction coefficient to increase the braking force between the friction pads 300 and the rotating shaft 100. When the friction pads 300 are worn, the extrusion member 400 can still squeeze the friction pads 300 so that the friction pads 300 hold the rotating shaft 100 tightly, and the braking force will not change significantly.

[0071] The extrusion gap 500 is formed by the side wall of the cavity 210 and the outer wall of the friction pad 300. The extrusion member 400 can squeeze the outer wall of the friction pad 300 and apply a force in the radial direction of the rotating shaft 100 to the friction pad 300 to directly increase the relative force between the friction pad 300 and the rotating shaft 100.

[0072] To allow the extrusion member 400 to gradually loosen or compress the friction pad 300 during its movement relative to the friction pad 300, the outer wall of the friction pad 300 gradually approaches the axis of the rotating shaft 100 in the reverse direction of the rotating shaft 100. In the reverse direction of the rotating shaft 100, the distance between the outer wall of the friction pad 300 and the sidewall of the cavity 210 continuously increases, thereby forming an extrusion gap 500 with a thickness that gradually increases along the reverse direction of the rotating shaft 100 (the thickness here refers to the dimension of the extrusion gap 500 in the radial direction of the rotating shaft 100). When the rotating shaft 100 reverses, the extrusion member 400 moves from a thicker position relative to the friction pad 300 to a thinner position within the extrusion gap 500. As the extrusion member 400 moves relative to the friction pad 300, it continuously compresses the friction pad 300, thereby increasing the braking force between the friction pad 300 and the rotating shaft 100.

[0073] Preferably, the outer side wall of the friction pad 300 is an arc surface, and can also be an inclined surface. Both structures can enable the extrusion member 400 to gradually squeeze or release the friction pad 300.

[0074] The inner wall of the friction pad 300 maintains contact with the rotating shaft 100. When the rotating shaft 100 rotates, there is friction between the inner wall of the friction pad 300, thereby driving the friction pad 300 to move relative to the extrusion member 400. Relative to the extrusion member 400, the movement of the friction pad 300 is equivalent to the movement of the extrusion gap 500 relative to the extrusion member 400, causing the extrusion member 400 to move to a position with a larger thickness or a smaller position. The extrusion member 400 is a rigid component and is not easy to deform. When the extrusion member 400 moves relative to the friction pad 300 to the extrusion gap 500 with a smaller thickness, the extrusion member 400 can squeeze the friction pad 300 to deform the friction pad 300 toward the rotating shaft 100, so that the thickness of the extrusion gap 500 at the current position of the extrusion member 400 is consistent with the size of the extrusion member 400.

[0075] The self-locking mechanism also includes a locking protrusion 600 for stopping the friction pad 300. The locking protrusion 600 can limit the friction pad 300 from further rotation after the friction pad 300 rotates a certain angle with the rotating shaft 100, and maintain the extrusion member 400 within the extrusion gap 500, so as to maintain the friction pad 300 in a position with minimum braking force on the rotating shaft 100 when the rotating shaft 100 rotates forward, and maintain the friction pad 300 in a position with maximum braking force on the rotating shaft 100 when the rotating shaft 100 rotates reversely. Although friction is generated due to contact between the rotating shaft 100 and the friction pad 300 when the rotating shaft 100 rotates forward, the friction pad 300 itself does not have the function of squeezing the rotating shaft 100, and the extrusion member 400 does not exert an extrusion force on the friction pad 300. Therefore, the friction between the friction pad 300 and the rotating shaft 100 has a negligible effect on the rotating shaft 100.

[0076] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the extrusion member 400 is a roller that contacts the outer side wall of the friction pad 300 and can rotate relative to the friction pad 300. The roller contacts the side wall of the cavity 210 to roll along the side wall of the cavity 210 when rotating.

[0077] When the rotating shaft 100 rotates, the friction pad 300 can rotate with the rotating shaft 100 under the action of friction, and the friction between the extrusion member 400 and the extrusion member 400 drives the extrusion member 400 to rotate relative to the friction pad 300. Under the action of the friction between the extrusion member 400 and the side wall of the cavity 210, the extrusion member 400 can roll along the side wall of the cavity during rotation, reducing the friction between the extrusion member 400 and the friction pad 300 to reduce wear, thereby preventing excessive wear from causing slippage between the friction pad 300 and the extrusion member 400 when the rotating shaft 100 reverses, resulting in insufficient braking force. When the rotating shaft 100 reverses, as the rotating shaft 100 rotates, the extrusion force between the extrusion member 400 and the friction pad 300 gradually increases, driving the extrusion member 400 to roll along the side wall of the cavity. The relative force between the friction pad 300 and the rotating shaft 100 also continues to increase, thereby increasing the friction between the friction pad 300 and the rotating shaft 100 after being stopped by the locking protrusion 600.

[0078] like Figure 4 As shown, the roller can be a gear that engages with the outer wall of the friction pad 300 to prevent relative sliding between the friction pad 300 and the extrusion member 400. This prevents the extrusion member 400 from exerting insufficient pressure on the friction pad 300 due to slippage, thereby preventing insufficient braking force. To prevent the friction pad 300 from sliding with the extrusion member 400 relative to the side wall of the cavity, the roller also engages with the side wall of the cavity.

[0079] In this embodiment, the locking protrusion 600 includes a first protrusion 610 arranged on the side wall of the cavity and a second protrusion 620 arranged on the outer wall of the friction pad 300. The first protrusion 610 can be pressed against the extrusion member 400 during the rotation of the extrusion member 400 to limit the extrusion member 400 from continuing to slide along the side wall of the cavity. The second protrusion 620 can be pressed against the extrusion member 400 after the extrusion member 400 is stopped by the first protrusion 610 to limit the friction pad 300 from continuing to rotate along the rotating shaft 100.

[0080] Reference Figure 3 Unlike the above-described embodiment, in one embodiment of the present invention, the extrusion member 400 includes a first pin fixed to the housing 200 and a roller rotatably mounted on the first pin. The roller contacts the outer wall of the friction pad 300 to rotate relative to the friction pad 300 when the friction pad 300 rotates with the rotating shaft 100. When the rotating shaft 100 rotates, the friction pad 300 rotates with the rotating shaft 100 due to friction, and the friction between the roller and the roller drives the roller to rotate relative to the first pin. The roller maintains a distance from the sidewall of the cavity to prevent sliding friction between the roller and the sidewall of the cavity when rolling relative to the first pin.

[0081] In this embodiment, the friction pad 300 has two ends in the circumferential direction of the rotating shaft 100 that protrude toward the sidewalls of the cavity to form retaining protrusions 600. The retaining protrusions 600 abut against the extrusion member 400 to stop the friction pad 300. The extrusion member 400 is fixed in position in the cavity. As the friction pad 300 moves within the cavity, the retaining protrusions 600 gradually approach the extrusion member 400 and, after abutting against the extrusion member 400, restrict the friction pad 300 from further rotation.

[0082] Reference Figure 1 Based on the above embodiment, in one embodiment of the present invention, the friction pad 300 is provided with an opening 310 arranged along the forward rotation direction of the rotating shaft 100.

[0083] In the radial direction of the rotating shaft 100, both sides of the opening 310 are flanked by friction pads 300. The friction pads 300 on one side are closer to the rotating shaft 100, while those on the other side are closer to the sidewall of the cavity. When the rotating shaft 100 rotates, the friction pads 300 near the sidewall of the cavity can deform into the opening 310 under the compressive force of the extrusion member 400 without obstructing the movement of the extrusion member 400 relative to the friction pads 300. As this portion of the friction pads 300 deforms into the opening 310, the friction pads 300 on the other side of the opening 310 can squeeze the rotating shaft 100 under the compressive force. The greater the degree of deformation of the friction pads 300 into the opening 310, the stronger the relative force between the friction pads 300 and the rotating shaft 100.

[0084] The friction pad 300 includes a fixed end 320 and two free ends 330 extending from the fixed end 320 along the forward rotation direction of the rotating shaft 100 , and an opening 310 is formed between the two free ends 330 .

[0085] Reference Figures 5 to 10 An elastic member 340 is disposed within the opening 310. Each end of the elastic member 340 is connected to a free end 330. The elastic member 340 is resilient and can be supported between the two free ends 330 to prevent the free end 330 near the cavity sidewall from deforming easily, thereby reducing the self-locking force on the rotating shaft 100. Furthermore, the extrusion force exerted on the free end 330 near the cavity sidewall can be transmitted to the other free end 330 via the elastic member 340, thereby ensuring a tight fit between the other free end 330 and the rotating shaft 100.

[0086] The elastic member 340 has various structures. Figure 5 、 6 As shown in FIG. 9 , the elastic member 340 may be a spring sheet, which may be arranged in an inclined manner in the opening 310 along a radial direction away from the rotation axis 100 or along the radial direction of the rotation axis 100. Figure 10 The elastic member 340 may also have a honeycomb structure or other structures. These elastic members 340 of different structures are all elastic, but their elastic properties are different, so as to adjust the stiffness of the friction pad 300 so that the self-locking mechanism can be adapted to different rotating shafts 100.

[0087] like Figure 11 As shown, unlike the above embodiment, in another embodiment of the present invention, a plurality of friction protrusions 350 are provided on the inner sidewall of the friction pad 300 at intervals in the circumferential direction of the rotating shaft 100. A gap is provided between two adjacent friction protrusions 350. When the extrusion member 400 compresses the friction pad 300, the gap between the two friction protrusions 350 can cause the friction pad 300 to deform.

[0088] like Figure 12 As shown, different from the above embodiment, in another embodiment of the present invention, the friction pad 300 is set through the two end surfaces of the rotating shaft 100 in the axial direction to form an extrusion gap 500, and the extrusion piece 400 is fixedly set on the shell 200.

[0089] The extrusion piece 400 is fixed in the position of the cavity. When the friction pad 300 moves in the cavity along with the rotating shaft 100, the end position of the extrusion gap 500 can be against the extrusion piece 400 to limit the friction pad 300 from continuing to rotate, so as to maintain the friction pad 300 at the position with the minimum braking force on the rotating shaft 100 when the rotating shaft 100 rotates forward, and maintain the friction pad 300 at the position with the maximum braking force on the rotating shaft 100 when the rotating shaft 100 rotates reversely.

[0090] The extrusion member 400 maintains contact with the side wall of the rotating shaft 100 close to the extrusion gap 500, and the side wall of the rotating shaft 100 close to the extrusion gap 500 gradually approaches the axis center line of the rotating shaft 100 in the reversing direction of the rotating shaft 100. The extrusion gap 500 is close to the side wall of the rotating shaft 100, and the distance between the extrusion gap 500 and the axis center line of the rotating shaft 100 continues to shrink in the reversing direction of the rotating shaft 100, while the distance between the extrusion member 400 and the axis center line of the rotating shaft 100 is a fixed value. When the rotating shaft 100 reverses, the friction pad 300 is deformed toward the rotating shaft 100 under the extrusion action of the extrusion member 400 so that the friction pad 300 can move relative to the extrusion member 400.

[0091] The size of the extrusion gap 500 in the radial direction of the rotating shaft 100 remains unchanged, but the trajectory of the extrusion gap 500 gradually deviates from the axis of the rotating shaft 100 in the reverse direction of the rotating shaft 100. Alternatively, the size of the extrusion gap 500 in the radial direction of the rotating shaft 100 gradually decreases in the reverse direction.

[0092] The friction pad 300 is a block structure and cannot cover the entire periphery of the rotating shaft 100. Therefore, multiple friction pads 300 and extrusion parts 400 are arranged on the periphery of the rotating shaft 100. When the rotating shaft 100 is reversed, self-locking force can be applied at multiple positions on the periphery of the rotating shaft 100 at the same time to improve the self-locking performance of the self-locking mechanism.

[0093] In order to avoid mutual compression between two adjacent friction pads 300, resulting in a disordered internal structure, based on the above embodiment, as Figure 3 As shown, in one embodiment of the present invention, the self-locking mechanism further includes a positioning member 700 , which can position the plurality of friction pads 300 on the periphery of the rotating shaft 100 and enable the plurality of friction pads 300 to maintain contact with the rotating shaft 100 .

[0094] When the rotating shaft 100 rotates, the friction pads 300 rotate with the rotating shaft 100 due to the friction force. The positioning member 700 can position the multiple friction pads 300, so that the multiple friction pads 300 can be maintained at the outer periphery of the rotating shaft 100 and in contact with the rotating shaft 100. At the same time, the positioning member 700 can also limit the spacing between the multiple friction pads 300. When a friction pad 300 rotates with the rotating shaft 100, the friction pad 300 can also drive the positioning member 700 to rotate, so that the multiple friction pads 300 can rotate synchronously with respect to the rotating shaft 100.

[0095] like Figure 3As shown, in one embodiment of the present invention, the positioning member 700 includes a collar and a second pin disposed on the collar. The collar is rotatably mounted on the rotating shaft 100. The friction pad 300 is rotatably mounted on the collar via the second pin so as to move closer to or further away from the rotating shaft 100 as the rotating shaft 100 rotates. When the friction pad 300 approaches the rotating shaft 100, the relative force between the two is increased, and when the friction pad 300 moves away from the rotating shaft 100, the relative force between the two is reduced. The collar abuts against the bottom wall of the cavity to support the positioning member 700.

[0096] like Figure 13 、 14 As shown, in one embodiment of the present invention, the positioning member 700 is a collar, and the friction pads 300 are provided with a retaining groove 710. The collar and retaining groove 710 cooperate to maintain contact between the rotating shaft 100 and the multiple friction pads 300, thereby driving the multiple friction pads 300 to move relative to the multiple extrusion members 400. The collar and retaining groove 710 cooperate to define the spacing between the friction pads 300 and the rotating shaft 100, ensuring that the multiple friction pads 300 maintain contact with the rotating shaft 100. Simultaneously, the collar allows the multiple friction pads 300 to move synchronously with the rotating shaft 100. The friction pads 300 vary in position radially and circumferentially around the rotating shaft 100, making them less susceptible to separation from the collar. The inner side wall of the friction pad 300 includes a protrusion 711 that maintains contact with the rotating shaft 100 and a braking surface 712 that clamps the rotating shaft 100 when the rotating shaft 100 reverses. When the rotating shaft 100 rotates forward, the friction pad 300 can rotate relative to the rotating shaft 100 toward the side wall of the cavity 210 with the contact point between the protrusion 711 and the rotating shaft 100 as the center of the circle, so that the braking surface 712 is away from the rotating shaft 100.

[0097] like Figure 15As shown, in one embodiment of the present invention, the positioning member 700 includes a buckle 720 and a buckle block 730, and the buckle 720 and the buckle block 730 are respectively arranged at both ends of the friction pad 300, and multiple friction pads 300 are connected end to end through the buckle 720 and the buckle block 730, so that the multiple friction pads 300 are connected into a whole. In this way, the multiple friction pads 300 can move synchronously with the rotating shaft 100, and under the cooperation of the buckle 720 and the buckle block 730, the distance between the friction pad 300 and the rotating shaft 100 is limited, so that the multiple friction pads 300 can maintain contact with the rotating shaft 100. The buckle 720 forms a space for accommodating the buckle block 730, and the buckle block 730 is connected to the friction pad 300 through a smaller connecting structure. A slot is provided on the buckle 720 to avoid the connecting mechanism. The buckle block 730 moves relative to the buckle 720 in the axial direction of the rotating shaft 100 to engage or disengage with the buckle 720, while the friction pad 300 changes position in the radial and circumferential directions of the rotating shaft 100, while the position in the axial direction remains unchanged, so it is not easy for multiple friction pads 300 to separate.

[0098] The present invention also discloses a motor, including a drive shaft, through which the motor outputs rotational power. The self-locking structure disclosed above is arranged outside the drive shaft to perform one-way self-locking on the drive shaft.

[0099] The present invention also discloses a linear actuator, which can output power in a straight line direction and is usually used in some lifting platforms. The linear actuator adopts the above-mentioned motor to provide power. In this way, the self-locking mechanism of the linear actuator will not affect the power output of the drive shaft when driving the lifting platform to rise. When the lifting platform remains stationary, the gravity of the lifting platform under the action of the self-locking mechanism will not cause the rotating shaft to reverse and cause the lifting platform to descend. Although the friction pads will apply considerable braking force to the rotating shaft only after the driving shaft rotates a certain angle, the position of the lifting platform will hardly change even if the driving shaft rotates a full circle, and the friction pads only need the driving shaft to rotate a certain angle to take effect.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A one-way self-locking mechanism applied to a rotating shaft, characterized in that: The cam is adapted to move the friction pad relative to the friction pad when the shaft is rotated, so as to squeeze the friction pad so that the friction pad holds the shaft tightly when the shaft is reversed, and to release the friction pad when the shaft is rotated forward. The one-way self-locking mechanism also includes a shell mounted on the shaft, the shell having a cavity for accommodating the extrusion pad and the friction pad, the extrusion gap being formed between the side wall of the cavity and the outer wall of the friction pad, the shaft contacts the friction pad to drive the friction pad to move relative to the extrusion pad, and the one-way self-locking mechanism also includes a locking protrusion for stopping the friction pad.

2. The one-way self-locking mechanism for a rotating shaft according to claim 1, characterized in that: The outer side wall of the friction pad gradually approaches the axis center line of the rotating shaft in the reverse direction of the rotating shaft.

3. The one-way self-locking mechanism for a rotating shaft according to claim 1, characterized in that: The extrusion member is a roller that contacts the outer side wall of the friction pad and can rotate relative to the friction pad. The roller contacts the side wall of the cavity to roll along the side wall of the cavity when rotating.

4. The one-way self-locking mechanism for a rotating shaft according to claim 1, characterized in that: The locking protrusion includes a first protrusion arranged on the side wall of the cavity and a second protrusion arranged on the outer side wall of the friction tile. The first protrusion is used to stop the extrusion piece, and the second protrusion is abutted against the extrusion piece to stop the friction tile.

5. The one-way self-locking mechanism for a rotating shaft according to claim 1, characterized in that: The extrusion member includes a first pin fixed on the shell and a roller rotatably mounted on the first pin, and the roller contacts the outer side wall of the friction pad to rotate relative to the friction pad when the friction pad rotates with the rotating shaft.

6. The one-way self-locking mechanism for a rotating shaft according to claim 5, characterized in that: The two ends of the friction pad in the circumferential direction of the rotating shaft protrude toward the side wall of the cavity to form the blocking protrusions, and the blocking protrusions abut against the extrusion piece to stop the friction pad.

7. A one-way self-locking mechanism applied to a rotating shaft, characterized in that: The cam is adapted to move the friction pad relative to the friction pad when the shaft is rotated, so as to squeeze the friction pad so that the friction pad holds the shaft tightly when the shaft is reversed, and to release the friction pad when the shaft is rotated forward. The one-way self-locking mechanism also includes a shell having a cavity for accommodating the extrusion pad and the friction pad. The two end faces of the friction pad in the axial direction of the shaft are through-set to form the extrusion gap. The shaft contacts the friction pad to drive the friction pad to move relative to the extrusion pad. The extrusion pad is fixedly mounted on the shell.

8. The one-way self-locking mechanism for a rotating shaft according to claim 7, characterized in that: The extrusion piece keeps in contact with the side wall of the extrusion gap close to the rotating shaft, and the side wall of the extrusion gap close to the rotating shaft gradually approaches the axis of the rotating shaft in the reverse direction of the rotating shaft.

9. The one-way self-locking mechanism applied to a rotating shaft according to any one of claims 1 to 8, characterized in that: The one-way self-locking mechanism also includes a ring rotatably mounted on the rotating shaft. The friction pads are provided in plurality and are rotatably mounted on the ring via a second pin shaft. The rotating shaft contacts the friction pads to drive the friction pads to move relative to the extrusion member.

10. The one-way self-locking mechanism applied to a rotating shaft according to any one of claims 1 to 8, characterized in that: There are multiple friction pads and extrusion parts, and the one-way self-locking mechanism also includes a ring. A slot is provided on the friction pad. The ring and the slot cooperate to keep the rotating shaft in contact with the multiple friction pads to drive the multiple friction pads to move relative to the multiple extrusion parts.

11. The one-way self-locking mechanism applied to a rotating shaft according to any one of claims 1 to 8, characterized in that: There are multiple friction tiles and extrusion parts, one end of the friction tile is provided with a snap buckle, and the other end of the friction tile is provided with a buckle block. The multiple friction tiles are connected end to end through the snap engagement of the snap buckle and the buckle block, so that the rotating shaft maintains contact with the multiple friction tiles to drive the multiple friction tiles to move relative to the multiple extrusion parts.

12. The one-way self-locking mechanism applied to a rotating shaft according to any one of claims 1 to 8, characterized in that: The inner side wall of the friction shoe is provided with a plurality of friction protrusions at intervals in the circumferential direction of the rotating shaft.

13. A motor, characterized in that The invention comprises an output shaft and a one-way self-locking mechanism applied to a rotating shaft according to any one of claims 1 to 12, wherein the one-way self-locking mechanism is used to self-lock the output shaft.

14. A linear actuator, characterized in that Including the motor according to claim 13.

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