A capstan brake device and capstan

Abstract

The application discloses a winch brake device and a winch, and belongs to the winch field, and solves the problems existing in the brake device of the existing winch. The technical scheme for solving the problem mainly comprises a mounting seat, a friction pad, an output shaft, a coupling and a coupling assembly. The end of the output shaft is provided with external threads. One end of the coupling is threadedly connected with the output shaft, and the other end is connected with a transmission shaft. The coupling can move along the axial direction of the output shaft. The coupling assembly comprises a first coupling member and a second coupling member. When the transmission shaft is a power source and drives the first coupling member to rotate in a first direction, the coupling moves along the output shaft to be close to the friction pad. The coupling pushes the first coupling member to be close to the second coupling member, and makes the first coupling member and the second coupling member keep coupling. The second coupling member moves to be close to the friction pad and is tightly attached to the friction pad. The application is mainly used for reducing the radial dimension of the brake device.

Description

Technical Field

[0001] This invention discloses a winch braking device and a winch, belonging to the field of winch technology. Background Technology

[0002] A winch is an auxiliary device used for vehicle self-rescue or as a towing device. Traditional winches often experience towing failure due to the lack of a braking device, so modern winches are designed with an automatic braking function.

[0003] Currently, winch braking structures typically include ratchet and pawl brakes and torsion spring brakes. Existing ratchet and pawl brakes increase the radial dimension of the brake structure, thus increasing the overall size of the brake. Torsion spring brakes, on the other hand, generate significant heat during operation, reducing their lifespan and making them prone to failure after wear, thus unsuitable for use on heavy-duty winches. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the braking devices of existing winches. To this end, a winch braking device and a winch are provided, which can reduce the radial dimension of the braking device.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A winch braking device, comprising:

[0007] Mounting base, on which a friction pad is fixed;

[0008] An output shaft, the end of which is provided with an external thread;

[0009] A coupling, one end of which is threaded to an output shaft and the other end of which is connected to a drive shaft, the coupling being movable along the axial direction of the output shaft;

[0010] The coupling assembly includes a first coupling member and a second coupling member arranged axially along the output shaft. The first coupling member and the second coupling member are located between a friction pad and a coupling. The second coupling member has a tendency to move away from the friction pad. When the first coupling member rotates along a first direction, it can couple with the second coupling member and drive the second coupling member to rotate synchronously.

[0011] When the drive shaft is the power source and drives the first coupling member to rotate in the first direction, the coupling moves closer to the friction pad along the output shaft. The coupling pushes the first coupling member closer to the second coupling member and keeps the first coupling member and the second coupling member coupled. The second coupling member moves toward the friction pad and is in close contact with the friction pad.

[0012] The beneficial effects of using the present invention are:

[0013] In this invention, the first and second coupling members are arranged axially along the output shaft. The coupling assembly, friction pad, and coupling are coaxially arranged within the axial range of the output shaft. This eliminates the need to reserve installation space for ratchet and pawl on the outer periphery of the output shaft, effectively reducing the radial dimension of the braking device and making the overall winch structure more compact. This facilitates the overall assembly of the braking device and helps save installation space. Furthermore, the second coupling member has a tendency to move away from the friction pad. During normal winch operation, this reduces the relative friction between the second coupling member and the friction pad. Only when the drive shaft is the power source and drives the first coupling member to rotate in the first direction does the second coupling member press against the friction pad and rotate relative to it, causing the friction pad to generate resistance to the rotation of the second coupling member. The braking effect is achieved by ensuring that the friction pad only rubs against the second coupling element when braking is required. This effectively reduces the wear of the friction pad and helps extend its service life. Meanwhile, during normal winch operation, the friction pad and the second coupling element do not rub against each other, thus reducing the friction pad's heat generation and minimizing the possibility of accelerated aging due to high temperatures, further extending its service life. Secondly, during braking, the coupling, under the action of the external thread on the output shaft, pushes the second coupling element towards the friction pad. The threaded engagement provides the coupling with greater axial clamping force, which increases the friction between the second coupling element and the friction pad, helping to reduce the braking stroke and achieving a rapid braking effect, reducing the risk of winch traction failure.

[0014] Preferably, the coupling includes a connecting sleeve and a connecting nut. One end of the connecting sleeve has a first connecting groove for connecting to the output shaft, and the other end has a second connecting groove for the connecting nut to extend into. The connecting sleeve and the connecting nut are fixedly connected by fasteners. The connecting nut has an internal thread for threaded connection to the output shaft. Using the aforementioned technical solution, the coupling is divided into two independent components: a connecting sleeve and a connecting nut. During assembly, the connecting nut can be screwed onto the external thread of the output shaft first, establishing the threaded connection between the nut and the output shaft. Then, the connecting sleeve and the connecting nut are fixedly connected. This effectively reduces the assembly difficulty of the coupling and the output shaft. Furthermore, if one component is damaged, only the corresponding component needs to be replaced, eliminating the need for complete replacement and helping to reduce maintenance costs.

[0015] Preferably, a cavity is formed between the connecting nut and the bottom wall of the second connecting groove. The end of the output shaft extends into the cavity and is provided with a radially outward protruding stop. The output shaft and the connecting nut rotate relative to each other, and the stop moves relative to the coupling within the cavity. Using the aforementioned technical solution, the stop can move relative to the coupling within the cavity, thereby limiting the axial movement of the connecting nut along the output shaft thread. When the coupling moves to its limit position towards the friction pad, the connecting nut can rotate synchronously with the output shaft.

[0016] Preferably, when the output shaft rotates in the first direction, the coupling moves away from the friction pad along the output shaft. After the stop block abuts against the connecting nut, the coupling rotates with the output shaft in the first direction. When the output shaft rotates in the second direction opposite to the first direction, the coupling moves closer to the friction pad along the output shaft. After the stop block abuts against the bottom wall of the second connecting groove, the coupling rotates with the output shaft in the second direction. Using the aforementioned technical solution, when the output shaft rotates in the first direction, the coupling automatically moves away from the friction pad under the action of the external thread. At this time, the second coupling member also moves away from the friction pad and does not contact it. When the output shaft rotates in the second direction, the coupling presses the second coupling member against the friction pad. At this time, the first coupling member is not coupled to the second coupling member, so the second coupling member does not rotate with the first coupling member. No sliding friction occurs between the friction pad and the second coupling member. Therefore, when the output shaft outputs power, the friction pad does not resist the rotation of the output shaft, avoiding unnecessary wear on the friction pad, reducing energy loss of the output shaft, and improving power transmission efficiency.

[0017] Preferably, the first coupling member has a first shaft hole through which the output shaft passes, and the connecting nut passes through the first shaft hole. The first coupling member is anti-rotatingly engaged with the connecting nut through the first shaft hole. The coupling has a first elastic element, the two ends of which abut against the connecting sleeve and the first coupling member, respectively. The first elastic element gives the first coupling member a tendency to move towards the second coupling member. Using the aforementioned technical solution, the preload force generated by the first elastic element on the first coupling member can assist in the rapid coupling of the first and second coupling members, preventing slippage between the first and second coupling members during braking, and enabling the braking device to provide a reliable braking effect.

[0018] Preferably, the opposing surfaces of the first coupling member and the second coupling member are provided with ratchet teeth, and the mounting base is provided with a second elastic member. The second elastic member acts on the second coupling member, causing the second coupling member to have a tendency to move away from the friction pad.

[0019] Preferably, the second coupling member is provided with a second shaft hole through which the output shaft passes, and the inner wall of the second shaft hole is provided with an inwardly extending abutment portion. A first bearing is mounted on the output shaft, and the second coupling member is fitted onto the first bearing. A push block is also fitted onto the output shaft, and the push block is located between the connecting nut and the first bearing. The two sides of the first bearing abut against the abutment portion and the push block, respectively.

[0020] The present invention also discloses a winch including a drive mechanism, a braking device, a reduction mechanism and a drum, wherein the braking device adopts a winch braking device as described in any of the above.

[0021] Preferably, the output end of the drive mechanism is connected to the output shaft of the brake device, the drive shaft passes through the inside of the drum, the drive shaft is connected to the input end of the reduction mechanism, and the output end of the reduction mechanism is connected to the drum.

[0022] Preferably, the output end of the drive mechanism is connected to the input end of the reduction mechanism, the output end of the reduction mechanism is connected to the output shaft of the brake device, and the drive shaft is connected to the roller.

[0023] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0024] The invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of a winch brake device according to the present invention;

[0026] Figure 2 This is an exploded view of a winch braking device according to the present invention;

[0027] Figure 3 This is a cross-sectional view of a winch braking device according to the present invention;

[0028] Figure 4 This is an exploded view of the coupling in a winch braking device according to the present invention.

[0029] Reference numerals: 1. Mounting base; 11. Mounting surface; 2. Output shaft; 21. External thread; 22. Stop block; 221. First snap ring; 23. First bearing; 24. Second bearing; 3. Coupling; 31. Connecting sleeve; 311. First connecting groove; 312. Second connecting groove; 313. Positioning groove; 314. First connecting hole; 315. Fastener; 32. Connecting nut; 321. Internal thread; 322. Second connecting hole; 323. Push block; 33. First elastic element; 4. Drive shaft; 5. Coupling assembly; 51. First coupling element; 511. First ratchet; 512. First shaft hole; 513. Groove; 52. Second coupling element; 521. Second ratchet; 522. Abutment part; 523. Second elastic element; 6. Friction pad. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1:

[0034] like Figures 1 to 4 As shown in the figure, this embodiment illustrates a winch braking device, including a mounting base 1, an output shaft 2, a coupling 3, a transmission shaft 4, and a coupling assembly 5. The mounting base 1 is fixed relative to the winch housing, and a friction pad 6 is fixed on the mounting base 1. The output shaft 2 passes through the mounting base 1 and can rotate freely relative to the mounting base 1. One end of the output shaft 2 extends out of the mounting base 1 and is provided with an external thread 21. One end of the coupling 3 is threadedly connected to the output shaft 2, and the other end of the coupling 3 is drively connected to the transmission shaft 4. The external thread 21 of the output shaft 2 allows the coupling 3 to move axially along the output shaft 2. The coupling assembly 5 includes a first coupling element 51 and... The second coupling member 52, the first coupling member 51, and the second coupling member 52 are all fitted onto the outer periphery of the output shaft 2. The first coupling member 51 and the second coupling member 52 are arranged along the axial direction of the output shaft 2 between the friction pad 6 and the coupling 3. The first coupling member 51 is closer to the coupling 3 than the second coupling member 52. The second coupling member 52 has a tendency to move away from the friction pad 6. The first coupling member 51 and the second coupling member 52 can only be coupled in one rotational direction so that the first coupling member 51 and the second coupling member 52 rotate synchronously. In the other opposite direction, the first coupling member 51 and the second coupling member 52 maintain relative rotation.

[0035] In this embodiment, when the drive shaft 4 is the power source and drives the first coupling member 51 to rotate in the first direction, the coupling 3 first approaches the friction pad 6 along the axial direction of the output shaft 2. During the axial movement, the coupling 3 pushes the first coupling member 51 closer to the second coupling member 52 so that the first coupling member 51 and the second coupling member 52 remain in close contact. The first coupling member 51 pushes the second coupling member 52 to move toward the friction pad 6 and to be in close contact with the friction pad 6. At the same time, the first coupling member 51 rotates with the coupling 3 in the first direction. During the rotation of the first coupling member 51 in the first direction, the first coupling member 51 and the second coupling member 52 remain coupled. At this time, the first coupling member 51 drives the second coupling member 52 to rotate synchronously. The friction pad 6 is in close contact with the second coupling member 52 to restrict the rotation of the second coupling member 52, thereby achieving braking and preventing the drive shaft 4 from rotating freely in the first direction. It also restricts the power transmission to the output shaft 2.

[0036] In this embodiment, the first coupling member 51 and the second coupling member 52 are arranged along the axial direction of the output shaft 2. The coupling assembly 5, the friction pad 6, and the coupling 3 are coaxially arranged within the axial range of the output shaft 2. This eliminates the need to reserve installation space for the ratchet and pawl on the outer periphery of the output shaft 2, effectively reducing the radial dimension of the braking device and making the overall winch structure more compact. This facilitates the overall assembly of the braking device and helps save installation space. Furthermore, the second coupling member 52 has a tendency to move away from the friction pad 6. During normal winch operation, this reduces the relative friction between the second coupling member 52 and the friction pad 6. Only when the transmission shaft 4 is the power source and drives the first coupling member 51 to rotate in the first direction does the second coupling member 52 come into close contact with the friction pad 6 and rotate relative to it, causing the friction pad 6 to generate resistance to the rotation of the second coupling member 52. This achieves a braking effect, meaning that the friction pad 6 only rubs against the second coupling member 52 when braking is required. This effectively reduces the wear of the friction pad 6 and helps extend its service life. Simultaneously, during normal winch operation, the friction pad 6 and the second coupling member 52 do not generate relative friction, thus reducing the likelihood of the friction pad 6 aging prematurely due to high temperatures and further extending its service life. Secondly, during braking, the coupling 3, under the action of the external thread 21 of the output shaft 2, pushes the second coupling member 52 towards the friction pad 6. The threaded engagement provides the coupling 3 with greater axial clamping force, thereby increasing the friction between the second coupling member 52 and the friction pad 6. This helps reduce the braking stroke, achieving a rapid braking effect and reducing the risk of winch traction failure.

[0037] Specifically, in this embodiment, the coupling 3 includes a connecting sleeve 31 and a connecting nut 32. One end of the connecting sleeve 31 is provided with a first connecting groove 311 for connecting to the drive shaft 4, and the other end is provided with a second connecting groove 312 for the connecting nut 32 to extend into. The outer wall of the connecting sleeve 31 is provided with a first connecting hole 314 communicating with the second connecting groove 312. The outer wall of the connecting nut 32 is provided with a second connecting hole 322 corresponding to the first connecting hole 314. When the connecting sleeve 31 and the connecting nut 32 are assembled, the connecting nut 32 is installed into the second connecting groove 312, and the second connecting hole 322 is aligned with the first connecting hole 314. The fastener 315 passes through the first connecting hole 314 and the second connecting hole 312. The coupling 3 is connected to the connecting sleeve 31 and the connecting nut 32 to fix them. The connecting nut 32 has a threaded hole in the middle for the output shaft 2 to pass through. The inner wall of the threaded hole has an internal thread 321 that matches the external thread 21 of the output shaft 2. The coupling 3 is divided into two independent parts: the connecting sleeve 31 and the connecting nut 32. During assembly, the connecting nut 32 can be screwed onto the external thread 21 of the output shaft 2 first to connect the thread of the connecting nut 32 to the output shaft 2. Then, the connecting sleeve 31 and the connecting nut 32 are fixedly connected. This can effectively reduce the assembly difficulty of the coupling 3 and the output shaft 2. When one of them is damaged, only the corresponding part needs to be replaced, without replacing the whole thing, which helps to reduce maintenance costs.

[0038] Specifically, in this embodiment, the cross-section of the first connecting groove 311 is a hexagonal structure, and the end structure of the transmission shaft 4 matches the structure of the first connecting groove 311. The transmission shaft 4 is inserted into the first connecting groove 311 to achieve anti-rotation fit, ensuring that the transmission shaft 4 and the connecting sleeve 31 can maintain synchronous rotation. Of course, it can be understood that in other embodiments, the shape of the first connecting groove 311 can also be quadrilateral, D-shaped or other non-circular structures.

[0039] Specifically, in this embodiment, the cross-section of the second connecting groove 312 is hexagonal. The structure of the outer periphery of the connecting nut 32 matches the structure of the second connecting groove 312. The connecting nut 32 is inserted into the second connecting groove 312 to achieve anti-rotation fit. The anti-rotation structure can speed up the alignment of the first connecting hole 314 and the second connecting hole 322, improve the assembly efficiency of the connecting sleeve 31 and the connecting nut 32, and at the same time, the anti-rotation structure can also ensure that the connecting sleeve 31 and the connecting nut 32 rotate synchronously. In addition, it can reduce the external force on the fastener 315 during the rotation of the coupling 3, and reduce the possibility of the fastener 315 breaking. It should be noted that in this embodiment, the connecting sleeve 31 is provided with two first connecting holes 314, which are symmetrically located on the outer periphery of the connecting sleeve 31. The fastener 315 is a screw or bolt.

[0040] Specifically, in this embodiment, after the connecting nut 32 is assembled into the second connecting groove 312, there is a cavity between the connecting nut 32 and the bottom wall of the second connecting groove 312. The axial length of the external thread 21 on the output shaft 2 is greater than the axial length of the internal thread 321 on the connecting nut 32. After the output shaft 2 and the connecting nut 32 are threadedly connected, the end of the output shaft 2 extends into the cavity. A stepped surface is formed on the end of the external thread 21 near the connecting sleeve 31. A stop block 22 is fitted on the output shaft 2. One side of the stop block 22 abuts against the stepped surface, and the other side is fixed by the first snap ring 221. The stop block 22 is positioned between the stepped surface and the first retaining spring 221. The outer diameter of the stop block 22 is larger than the inner diameter of the connecting nut 32. After the output shaft 2 is assembled with the coupling 3, the stop block 22 is located in the cavity of the second connecting groove 312. The assembly process of the output shaft 2 and the coupling 3 is as follows: the connecting nut 32 is first threadedly connected to the output shaft 2 and the end of the output shaft 2 passes through the connecting nut 32. Then, the first retaining spring 221 is used to fix the stop block 22 on the output shaft 2, thereby restricting the connecting nut 32 from disengaging from the output shaft 2. Finally, the fastener 315 is used to fix the connecting sleeve 31 and the connecting nut 32.

[0041] It should be noted that the bottom wall refers to the wall surface inside the second connecting groove 312 that is directly opposite the groove opening.

[0042] Specifically, in this embodiment, the output shaft 2 and the connecting nut 32 rotate relative to each other, and the stop block 22 moves relative to the coupling 3 in the cavity, thereby limiting the axial movement of the connecting nut 32 along the thread of the output shaft 2. When the coupling 3 moves to the limit position towards the friction pad 6, the connecting nut 32 can rotate synchronously with the output shaft 2.

[0043] It should be noted that in other embodiments, the connecting sleeve 31 and the connecting nut 32 may also be an integral structure.

[0044] Specifically, in this embodiment, the first coupling member 51 is provided with a first shaft hole 512 through which the output shaft 2 passes. The connecting nut 32 passes through the first shaft hole 512. The shape of the first shaft hole 512 matches the shape of the connecting nut 32, thereby forming an anti-rotation fit between the first shaft hole 512 and the connecting nut 32 to ensure that the first coupling member 51 and the connecting nut 32 rotate synchronously. The coupling 3 is provided with a first elastic member 33. The two ends of the first elastic member 33 abut against the connecting sleeve 31 and the first coupling member 51, respectively. The first elastic member 33 gives the first coupling member 51 a tendency to move towards the second coupling member 52. The preload force generated by the first elastic member 33 on the first coupling member 51 can assist the first coupling member 51 and the second coupling member 52 to quickly couple, preventing the possibility of slippage between the first coupling member 51 and the second coupling member 52 during braking, so that the braking device can provide a reliable braking effect.

[0045] Specifically, in this embodiment, the end of the connecting sleeve 31 facing the first coupling member 51 is provided with a positioning groove 313, and the side of the first coupling member 51 facing the connecting sleeve 31 is provided with a groove 513. The end of the first elastic member 33 is positioned in the positioning groove 313, and the other end of the first elastic member 33 is positioned in the groove 513. The positioning groove 313 and the groove 513 respectively position the two ends of the first elastic member 33, which can effectively prevent the first elastic member 33 from slipping or shifting its position, so that the first elastic member 33 can maintain a reliable elastic reset function for the first coupling member 51.

[0046] Specifically, in this embodiment, the second coupling member 52 is provided with a second shaft hole through which the output shaft 2 passes. The inner wall of the second shaft hole is provided with an inwardly extending abutment portion 522. The output shaft 2 is equipped with a first bearing 23. The second coupling member 52 is fitted onto the outer periphery of the first bearing 23, so that the second shaft hole of the second coupling member 52 is in contact with the outer ring of the first bearing 23. The abutment portion 522 is located on the side of the first bearing 23 facing away from the connecting nut 32. The output shaft 2 is also fitted with a push block 323. The push block 323 is located between the connecting nut 32 and the first bearing 23. The connecting nut 32 abuts against the first bearing 23 through the push block 323. As the connecting nut 32 moves closer to the friction pad 6 along the output shaft 2, the connecting nut 32 pushes the first bearing 23 through the push block 323. The first bearing 23 pushes the second coupling member 52 through the abutment portion 522.

[0047] Specifically, in this embodiment, the mounting base 1 has a mounting surface 11 on the side facing the coupling 3. The friction pad 6 is fixed on the mounting surface 11. The friction pad 6 has a through hole in the middle. The mounting base 1 is also provided with a second elastic element 523. The second elastic element 523 is fitted onto the output shaft 2 and is at least partially located in the through hole. One end of the second elastic element 523 abuts against the mounting base 1, and the other end abuts against the second coupling element 52. The second elastic element 523 causes the second coupling element 52 to have a tendency to move away from the friction pad 6. In addition, a second bearing 24 is also fitted onto the output shaft 2. The outer ring of the second bearing 24 is interference-fitted with the inner wall of the mounting base 1 so that the output shaft 2 and the mounting base 1 maintain a rotational engagement.

[0048] Specifically, in this embodiment, the first coupling member 51 is provided with a first ratchet 511 on the side facing the second coupling member 52, and the second coupling member 52 is provided with a second ratchet 521 on the side facing the first coupling member 51. When the first coupling member 51 rotates in the first direction, the first ratchet 511 and the second ratchet 521 engage, so that the first coupling member 51 can drive the second coupling member 52 to rotate synchronously. However, when the first coupling member 51 rotates in the second direction opposite to the first direction, the first ratchet 511 and the second ratchet 521 cannot engage, and the second coupling member 52 will not rotate synchronously with the first coupling member 51.

[0049] Specifically, in this embodiment, when the output shaft 2 is the power source and rotates along the first direction, the winch drum is in the rope-releasing state. When the output shaft 2 just starts to rotate, the output shaft 2 and the connecting nut 32 rotate relative to each other. The output shaft 2 rotates along the first direction, which means that the connecting nut 32 rotates relative to the output shaft 2 along the second direction. At this time, the connecting nut 32 first moves along the output shaft 2 towards the side away from the friction pad 6. When the connecting nut 32 abuts against the stop block 22, the coupling 3 and the output shaft 2 rotate synchronously along the first direction. During the axial movement of the coupling 3, the second elastic element 523 pushes the second coupling element 52 away from the friction pad 6 and the first coupling element 52. 1. Maintaining a close fit, there is a gap between the second coupling member 52 and the friction pad 6. When the coupling 3 rotates synchronously with the output shaft 2, the coupling 3 drives the first coupling member 51 to rotate in the first direction. At this time, the first ratchet 511 and the second ratchet 521 mesh with each other, and the first coupling member 51 can drive the second coupling member 52 to rotate synchronously. Since there is a gap between the second coupling member 52 and the friction pad 6, no friction force is generated between the second coupling member 52 and the friction pad 6. Therefore, when the output shaft 2 outputs power, the friction pad 6 will not generate resistance to the rotation of the output shaft 2, avoiding unnecessary wear of the friction pad 6, reducing the energy loss of the output shaft 2, and improving the power transmission efficiency.

[0050] When the output shaft 2 is the power source and rotates in the second direction, the winch drum is in the winding state. When the output shaft 2 just starts to rotate, the output shaft 2 and the connecting nut 32 rotate relative to each other. The output shaft 2 rotates in the second direction, which means that the connecting nut 32 rotates relative to the output shaft 2 in the first direction. At this time, the connecting nut 32 first moves along the output shaft 2 towards the side closer to the friction pad 6. When the end of the output shaft 2 abuts against the bottom wall of the second connecting groove 312, the coupling 3 rotates synchronously with the output shaft 2 in the second direction. During the axial movement of the coupling 3, the coupling 3 pushes the first coupling member 51 towards the friction pad 6 through the first elastic member 33, and interacts with the second coupling member. 52 remains in contact, while the first coupling member 51 pushes the second coupling member 52 closer to the friction pad 6, so that the second coupling member 52 and the friction pad 6 remain in contact. When the coupling 3 rotates synchronously with the output shaft 2, the coupling 3 drives the first coupling member 51 to rotate in the second direction. In the second direction of the first coupling member 51, the first ratchet 511 and the second ratchet 521 slip against each other, and the second coupling member 52 will not rotate synchronously with the first coupling member 51. The second coupling member 52 remains in contact with the friction pad 6. Therefore, when the output shaft 2 outputs power, the friction pad 6 will not generate resistance to the rotation of the output shaft 2, avoiding unnecessary wear of the friction pad 6, reducing the energy loss of the output shaft 2, and improving the power transmission efficiency.

[0051] When the drive shaft 4 is the power source and rotates along the first direction, the winch drum is in the rope-releasing state. The drive shaft 4 drives the coupling 3 to rotate synchronously. When the coupling 3 just starts to rotate, the connecting nut 32 rotates relative to the output shaft 2. The coupling 3 rotates along the first direction. At this time, the connecting nut 32 first moves along the output shaft 2 towards the side closer to the friction pad 6. During the axial movement of the coupling 3, the coupling 3 pushes the first coupling member 51 towards the friction pad 6 through the first elastic member 33 and keeps it in contact with the second coupling member 52. At the same time, the first coupling member 51 pushes the second coupling member 52 closer to the friction pad 6, so that... The second coupling member 52 remains in contact with the friction pad 6. When the coupling 3 rotates synchronously with the output shaft 2, the coupling 3 drives the first coupling member 51 to rotate in the first direction. At this time, the first ratchet 511 and the second ratchet 521 mesh with each other. The first coupling member 51 can drive the second coupling member 52 to rotate synchronously. The friction pad 6 will generate resistance to the second coupling member 52. At the same time, the coupling 3 and the first coupling member 51 will generate a clamping force on the second coupling member 52, thereby increasing the friction between the friction pad 6 and the second coupling member 52 to limit the rotation of the second coupling member 52, thereby limiting the rotation of the transmission shaft 4 and preventing the drum from automatically releasing the rope, which could cause safety hazards.

[0052] When the drive shaft 4 is the power source and rotates along the second direction, the winch drum is in the rope-reeling state. The drive shaft 4 drives the coupling 3 to rotate synchronously. When the coupling 3 just starts to rotate, the connecting nut 32 rotates relative to the output shaft 2. The coupling 3 rotates along the second direction. At this time, the connecting nut 32 first moves along the output shaft 2 away from the friction pad 6. During the axial movement of the coupling 3, the second elastic element 523 pushes the second coupling element 52 away from the friction pad 6 and keeps it in contact with the first coupling element 51. At this time, there is a gap between the second coupling element 52 and the friction pad 6. When the coupling 3 rotates synchronously with the output shaft 2, the coupling 3 drives the first coupling element 51 to rotate along the second direction. In the second direction of the first coupling element 51, the first ratchet 511 and the second ratchet 521 slip against each other. The second coupling element 52 will not rotate synchronously with the first coupling element 51. At this time, the drive shaft 4 can rotate freely, and the operator can manually reel in the rope.

[0053] Example 2:

[0054] This embodiment also illustrates a winch, including a drive mechanism, a braking device, a reduction mechanism, and a drum. The braking device is the winch braking device described in Embodiment 1. In this embodiment, the output end of the drive mechanism is connected to the output shaft 2 of the braking device. The drive shaft 4 passes through the inside of the drum and is connected to the input end of the reduction mechanism. The output end of the reduction mechanism is connected to the drum. The braking structure is close to the drive mechanism, which can reduce the torque on the braking structure and reduce the strength requirements of the output shaft 2.

[0055] It is understandable that in other embodiments, the output end of the drive mechanism may also be connected to the input end of the reduction mechanism, the output end of the reduction mechanism may be connected to the output shaft 2 of the brake device, and the drive shaft 4 may be connected to the roller.

[0056] 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 should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A winch braking device, characterized in that, include: Mounting base, on which a friction pad is fixed; An output shaft, the end of which is provided with an external thread; A coupling, one end of which is threaded to an output shaft and the other end of which is connected to a drive shaft, the coupling being movable along the axial direction of the output shaft; The coupling assembly includes a first coupling member and a second coupling member arranged axially along the output shaft. The first coupling member and the second coupling member are located between a friction pad and a coupling. The second coupling member has a tendency to move away from the friction pad. When the first coupling member rotates along a first direction, it can couple with the second coupling member and drive the second coupling member to rotate synchronously. When the drive shaft is the power source and drives the first coupling member to rotate in the first direction, the coupling moves closer to the friction pad along the output shaft. The coupling pushes the first coupling member closer to the second coupling member and keeps the first coupling member and the second coupling member coupled. The second coupling member moves toward the friction pad and is in close contact with the friction pad.

2. The winch brake device according to claim 1, characterized in that, The coupling includes a connecting sleeve and a connecting nut. One end of the connecting sleeve is provided with a first connecting groove for connecting with the output shaft, and the other end is provided with a second connecting groove for the connecting nut to extend into. The connecting sleeve and the connecting nut are fixedly connected by fasteners. The connecting nut is provided with an internal thread for threaded connection with the output shaft.

3. A winch brake device according to claim 2, characterized in that, There is a cavity between the connecting nut and the bottom wall of the second connecting groove. The end of the output shaft extends into the cavity and is provided with a stop that protrudes radially outward. The output shaft rotates relative to the connecting nut, and the stop moves relative to the coupling within the cavity.

4. A winch brake device according to claim 3, characterized in that, When the output shaft rotates in the first direction, the coupling moves away from the friction pad along the output shaft. After the stop block abuts against the connecting nut, the coupling rotates with the output shaft in the first direction. When the output shaft rotates in the second direction opposite to the first direction, the coupling moves closer to the friction pad along the output shaft. After the stop block abuts against the bottom wall of the second connecting groove, the coupling rotates with the output shaft in the second direction.

5. A winch brake device according to claim 2, characterized in that, The first coupling member has a first shaft hole through which the output shaft passes. The connecting nut passes through the first shaft hole. The first coupling member is anti-rotating with the connecting nut through the first shaft hole. The coupling has a first elastic element. The two ends of the first elastic element abut against the connecting sleeve and the first coupling member, respectively. The first elastic element gives the first coupling member a tendency to move toward the second coupling member.

6. A winch brake device according to claim 2, characterized in that, Both the first coupling member and the second coupling member have ratchet teeth on their opposing surfaces. The mounting base is provided with a second elastic member, which acts on the second coupling member to make the second coupling member have a tendency to move away from the friction pad.

7. A winch brake device according to claim 6, characterized in that, The second coupling member is provided with a second shaft hole through which the output shaft passes. The inner wall of the second shaft hole is provided with an inwardly extending abutment. A first bearing is mounted on the output shaft. The second coupling member is fitted onto the first bearing. A push block is also fitted onto the output shaft. The push block is located between the connecting nut and the first bearing. The two sides of the first bearing abut against the abutment and the push block, respectively.

8. A winch, comprising a drive mechanism, a braking device, a reduction mechanism, and a drum, characterized in that, The braking device is a winch braking device as described in any one of claims 1 to 7.

9. A winch according to claim 8, characterized in that, The output end of the drive mechanism is connected to the output shaft of the brake device. The drive shaft passes through the inside of the drum and is connected to the input end of the reduction mechanism. The output end of the reduction mechanism is connected to the drum.

10. A winch according to claim 8, characterized in that, The output end of the drive mechanism is connected to the input end of the reduction mechanism, the output end of the reduction mechanism is connected to the output shaft of the brake device, and the drive shaft is connected to the roller.

Images