Built-in lifting winch
The built-in hoisting winch solves the problem of bearing damage in traditional winches through line contact and toothed slot design, achieving more stable and durable winch operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN RUIGE TRANSMISSION MASCH CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-04-28
AI Technical Summary
In traditional hoisting winches, the bolted connection between the reducer and the drum causes the deformation force of the drum to be transmitted to the bearing, resulting in bearing damage and affecting the life of the reducer.
The design incorporates a built-in hoisting winch, which achieves a flexible connection by using the line contact between the mating ridge and the mating groove, as well as the buffering effect of the curved surface, combined with the clearance fit between the clamping teeth and the clamping groove. This ensures uniform load transfer and reduces bearing torsional stress.
It reduces torsional damage to the reducer bearings, extends bearing life, improves equipment stability and reliability, and reduces noise and vibration.
Smart Images
Figure CN224172360U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hoisting equipment technology, and in particular to a built-in lifting hoist. Background Technology
[0002] Winches, as a type of light and small lifting equipment that uses a drum to wind steel wire rope or chain to lift or pull heavy objects, are widely used in various industrial production and construction engineering fields for the transportation of workpieces and materials.
[0003] Traditional hoisting winches use a bolted connection between the reducer and the drum. When lifting heavy objects, the force of the drum's downward deformation is transmitted to the reducer's bearings, creating a non-pure radial external force that causes significant damage to the bearings and ultimately damages the reducer. Utility Model Content
[0004] The purpose of this invention is to provide a built-in hoisting winch to solve the problems existing in the prior art, reduce torsional damage to the reducer bearings, and extend the service life of the bearings.
[0005] To achieve the above objectives, this utility model provides the following solution:
[0006] This utility model provides a built-in hoisting winch, including a reducer, a fixed frame, and a drum. The rotating output end of the reducer is provided with a mating protrusion, and at least one first slot is provided on the outer wall of the mating protrusion away from the axis of the output end of the reducer. The fixed frame can be fixedly connected to the fixed part of the reducer. One end of the drum is rotatably connected to the fixed frame, and the other end of the drum is provided with a mating groove. At least one first tooth is fixedly provided on the inner wall of the mating groove. The first slot and the first tooth correspond one-to-one, and the first tooth and the first slot are in clearance fit. The mating protrusion and the inner wall of the mating groove are in line contact. In the axial direction of the mating groove, the mating protrusions on both sides of the line contact are arc-shaped curved surfaces. In the radial direction of the mating groove, the ends of each arc-shaped curved surface away from the axis of the mating groove collectively form the line contact.
[0007] Preferably, at least one second slot is provided on the outer wall of the mating protrusion away from the output end of the reducer; at least one second tooth is fixedly provided on the inner wall of the mating slot, and the second tooth corresponds one-to-one with the second slot; the first slot has a first pushing surface, and the first tooth has a first receiving surface; the second slot has a second pushing surface, and the second tooth has a second receiving surface; when the rotating output end of the reducer rotates around a first direction, the first pushing surface of the first slot can push the corresponding first receiving surface on the first tooth to drive the drum to rotate synchronously; and when the rotating output end of the reducer rotates around a second direction, the second pushing surface of the second slot can push the corresponding second receiving surface on the second tooth to drive the drum to rotate synchronously; the first direction is opposite to the second direction.
[0008] Preferably, the reducer includes a first cylinder, a second cylinder, a central shaft, a sun gear, a first planetary carrier, a second planetary carrier, a plurality of first planetary gears, and a plurality of second planetary gears; the first cylinder has a through-hole; a fixed internal gear ring is fixedly disposed on the inner wall of the first channel; the second cylinder is rotatably sleeved on the outside of the first cylinder via a first bearing; an output internal gear ring is fixedly disposed on the inner wall of the second cylinder; the central shaft passes through the first channel, and one end of the central shaft is rotatably connected to the first cylinder via a second bearing; the sun gear is coaxially fixed to the central shaft; each of the first planetary gears is circumferentially distributed around the axis of the sun gear, and each of the first planetary gears meshes with the sun gear and the fixed internal gear ring; the first planetary gears are rotatably disposed on a first planetary shaft, and one end of the first planetary shaft is fixedly connected to the first planetary carrier. The first planetary shaft is fixedly connected to the second planetary carrier at one end; each second planetary gear is circumferentially distributed around the axis of the sun gear, and each second planetary gear meshes with the sun gear and the output internal gear ring; the second planetary gears are rotatably mounted on the second planetary shaft, one end of the second planetary shaft is fixedly connected to the first planetary carrier, and the other end of the second planetary shaft is fixedly connected to the second planetary carrier; the first planetary carrier is located on the side of the first planetary gears away from the second planetary gears, and the first planetary carrier is rotatably connected to the central shaft through a third bearing; the second planetary carrier is located on the side of the second planetary gears away from the first planetary gears, and the second planetary carrier is rotatably connected to the central shaft through a fourth bearing; the number of teeth of the output internal gear ring is greater than the number of teeth of the fixed internal gear ring; the mating ridge is fixedly mounted on the output internal gear ring.
[0009] Preferably, the first planetary carrier is rotatably connected to the first cylinder via a fifth bearing.
[0010] Preferably, the end of the second cylinder away from the first cylinder is a closed end; a connecting column is fixed on the closed end located inside the second cylinder; the second planetary carrier is rotatably connected to the connecting column through a sixth bearing.
[0011] Preferably, the second cylinder is rotatably sleeved on the outside of the first cylinder via the seventh bearing and the first bearing.
[0012] Preferably, the seventh bearing is a crossed roller bearing.
[0013] Preferably, it also includes a motor, the output shaft of which is fixedly connected to the input shaft of the reducer via a coupling.
[0014] Preferably, the motor is further provided with a brake, which can limit the rotation of the end of the motor's output shaft away from the reducer.
[0015] Preferably, there are three first slots and three second slots, and the first slots and the second slots are arranged in a staggered manner around the axis of the mating protrusion.
[0016] The present invention achieves the following technical advantages over the prior art:
[0017] The built-in hoisting winch provided by this utility model, through the line contact between the mating protrusion and the inner wall of the mating groove, and the arc-shaped curved surface design on both sides of the line contact, plays a buffering and self-adaptive role during the operation of the winch. When the drum is subjected to external forces such as the shaking of heavy objects, or impacts during hoisting or descent, the arc-shaped curved surface allows for a certain relative displacement and angle change between the mating protrusion and the mating groove. This is like a "flexible connection," which can absorb some impact energy, reduce the direct transmission of impact force to the reducer bearing, and reduce the torsional stress borne by the bearing. The mating groove on the drum is fitted with the first groove on the mating protrusion at the output end of the reducer through a clearance fit of the first retaining tooth. When the winch is in operation... During operation, this type of connection allows the load on the drum to be transmitted more evenly to the output shaft of the reducer through the meshing of the teeth and slots. This avoids excessive local loads caused by inaccurate connections or uneven force distribution, thereby reducing additional torsional forces on the reducer bearings. The fixed brackets are connected to the fixed part of the reducer and one end of the drum, providing precise installation positioning for the reducer and drum. This ensures the coaxiality of the connecting axis between the reducer output end and the drum, reducing eccentric loads caused by installation errors. The improved coaxiality makes the reducer output shaft rotate more smoothly, and the radial and axial forces on the bearings are more uniform, thus reducing the risk of torsional damage to the bearings. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A schematic diagram of the overall structure of the built-in hoisting winch provided by this utility model;
[0020] Figure 2 for Figure 1 The front view;
[0021] Figure 3 An exploded view of the structure of the drum and the second cylinder in the built-in hoisting winch provided by this utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the first planetary carrier, the second planetary carrier, the first planetary gear, and the second planetary gear in the built-in hoisting winch provided by this utility model.
[0023] In the picture:
[0024] 10-Brake;
[0025] 20 - Motor;
[0026] 30-Reducer; 31-First cylinder; 311-Fixed internal gear ring; 32-Second cylinder; 321-Output internal gear ring; 322-Mating protrusion; 323-First slot; 324-Second slot; 325-Arc-shaped surface; 326-First pushing surface; 33-Central shaft; 34-Sun gear; 35-First planetary gear; 36-Second planetary gear; 37-First planetary carrier; 38-Second planetary carrier;
[0027] 40 - Fixture;
[0028] 50 - Drum; 51 - First locking tooth; 511 - First receiving surface; 52 - Second locking tooth;
[0029] 60 - First bearing; 61 - Second bearing; 62 - Third bearing; 63 - Fourth bearing; 64 - Fifth bearing; 65 - Sixth bearing; 66 - Seventh bearing. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] The purpose of this invention is to provide a built-in hoisting winch to solve the problems existing in the prior art, reduce torsional damage to the reducer bearings, and extend the service life of the bearings.
[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] Example 1
[0034] This embodiment provides a built-in hoisting winch, such as Figures 1-4 As shown, it includes a speed reducer 30, a fixing frame 40, and a drum 50; the rotating output end of the speed reducer 30 is provided with a mating protrusion 322, and at least one first slot 323 is provided on the outer side wall of the mating protrusion 322 away from the axis of the output end of the speed reducer 30; the fixing frame 40 can be connected to the fixing part of the speed reducer 30 (which can be the first cylinder 31 of the speed reducer 30, or as... Figure 1 and Figure 2 As shown, the first cylinder 31 is fixed to the motor 20 (i.e., the fixing frame 40 is fixedly connected to the motor 20); one end of the drum 50 is rotatably connected to the fixing frame 40, and the other end of the drum 50 is provided with a docking groove, and at least one first locking tooth 51 is fixedly provided on the inner side wall of the docking groove; the first locking groove 323 corresponds one-to-one with the first locking tooth 51, and the first locking tooth 51 and the first locking groove 323 are in clearance fit; the docking protrusion 322 is in line contact with the inner side wall of the docking groove; in the axial direction of the docking groove, the docking protrusion 322 on both sides of the line contact are all arc-shaped curved surfaces 325; in the radial direction of the docking groove, the ends of each arc-shaped curved surface 325 away from the axis of the docking groove jointly form a line contact.
[0035] Through the line contact between the mating ridge 322 and the inner wall of the mating groove, and the arc-shaped curved surfaces 325 on both sides of the line contact, a buffering and adaptive function is achieved during winch operation. When the drum 50 is subjected to external forces such as the shaking of heavy objects or impacts during lifting or lowering, the arc-shaped curved surfaces 325 allow for a certain relative displacement and angle change between the mating ridge 322 and the mating groove. This acts like a "flexible connection," absorbing some impact energy and reducing the direct transmission of impact force to the bearing of the reducer 30, thus reducing the torsional stress borne by the bearing. The mating groove on the drum 50 is fitted with the first groove 323 on the mating ridge 322 at the output end of the reducer 30 through the first retaining tooth 51. When the winch is working, this... The engagement method allows the load on the drum 50 to be transmitted more evenly to the output shaft of the reducer 30 through the meshing of the teeth and slots, avoiding excessive local loads caused by inaccurate connections or uneven force distribution, thereby reducing additional torsional forces on the bearings of the reducer 30. The fixing bracket 40 is connected to the fixed part of the reducer 30 and one end of the drum 50, providing precise installation positioning for the reducer 30 and the drum 50, ensuring the coaxiality of the connecting axis between the output end of the reducer 30 and the drum 50, reducing eccentric loads caused by installation errors. The improved coaxiality makes the output shaft of the reducer 30 rotate more smoothly, and the radial and axial forces on the bearings are more uniform, thereby reducing the risk of torsional damage to the bearings.
[0036] The built-in hoisting winch of this embodiment also includes the following components:
[0037] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2 As shown, it also includes a motor 20, whose output shaft is fixedly connected to the input shaft of the reducer 30 via a coupling. The coupling can, to a certain extent, buffer the impact generated when the motor 20 starts and stops, as well as the vibration that may occur during the operation of the winch. This helps protect the gears and bearings inside the reducer 30, reduces wear and fatigue caused by impact and vibration, and extends the service life of the reducer 30. At the same time, it can also reduce the noise and vibration generated during equipment operation, and improve the stability and reliability of the equipment.
[0038] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2As shown, a brake 10 is also provided on the motor 20. The brake 10 can limit the rotation of the end of the output shaft of the motor 20 away from the reducer 30 (that is, the brake 10 can brake the rotation of the output shaft of the electrode). The brake 10 can quickly brake the rotation of the motor 20 when needed, so that the drum 50 of the winch stops accurately at the designated position, realizing precise positioning control. This is very important for some application scenarios that require precise lifting or lowering positions, such as loading and unloading goods on port cranes and precise material lifting in construction, which can improve work efficiency and safety.
[0039] Specifically, the brake 10 and motor 20 are existing structures, and will not be described in detail here. Figure 1 and Figure 2 Its specific structure is not shown in the text.
[0040] Among them, the relevant structural settings of the reducer 30 are as follows:
[0041] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 1-4As shown, the reducer 30 includes a first cylinder 31, a second cylinder 32, a central shaft 33, a sun gear 34, a first planetary carrier 37, a second planetary carrier 38, multiple first planetary gears 35, and multiple second planetary gears 36. The first cylinder 31 has a through-passage first channel. A fixed internal gear ring 311 is fixedly installed on the inner wall of the first channel. The second cylinder 32 is rotatably sleeved on the outside of the first cylinder 31 via a first bearing 60. An output internal gear ring 321 is fixedly installed on the inner wall of the second cylinder 32. The central shaft 33 passes through the first channel, and one end of the central shaft 33 is rotatably connected to the first cylinder 31 via a second bearing 61. The sun gear 34 is coaxially fixed with the central shaft 33. Each first planetary gear 35 is circumferentially distributed around the axis of the sun gear 34, and each first planetary gear 35 meshes with the sun gear 34 and the fixed internal gear ring 311. The first planetary gears 35 are rotatably mounted on the first planetary shaft, and one end of the first planetary shaft is connected to the first... Planet carrier 37 is fixedly connected, and the other end of the first planetary shaft is fixedly connected to the second planetary carrier 38; each second planetary gear 36 is circumferentially distributed around the axis of the sun gear 34, and each second planetary gear 36 meshes with the sun gear 34 and the output internal gear ring 321; the second planetary gear 36 is rotatably mounted on the second planetary shaft, one end of the second planetary shaft is fixedly connected to the first planetary carrier 37, and the other end of the second planetary shaft is fixedly connected to the second planetary carrier 38; the first planetary carrier 37 is located on the side of the first planetary gear 35 away from the second planetary gear 36, and the first planetary carrier 37 is rotatably connected to the central shaft 33 through the third bearing 62; the second planetary carrier 38 is located on the side of the second planetary gear 36 away from the first planetary gear 35, and the second planetary carrier 38 is rotatably connected to the central shaft 33 through the fourth bearing 63; the number of teeth of the output internal gear ring 321 is greater than the number of teeth of the fixed internal gear ring 311; the mating ridge 322 is fixedly mounted on the output internal gear ring 321. A two-stage planetary gear system is formed through the meshing transmission of the sun gear 34, multiple first planetary gears 35 with the fixed internal gear ring 311, and multiple second planetary gears 36 with the output internal gear ring 321. This structure can achieve a large transmission ratio in a small space, allowing the winch to obtain a lower drum speed and a larger torque output with a smaller motor speed 20, meeting the needs of lifting heavy objects, while not making the overall size of the winch too large. Multiple planetary gears are evenly distributed around the sun gear 34, sharing the load, so that the force borne by each planetary gear is relatively small. This not only improves the load-bearing capacity of the reducer 30, enabling it to adapt to larger lifting weights, but also reduces the wear of individual gears and extends the service life of the gears. At the same time, the planetary carrier is rotatably connected to the central shaft 33 through multiple bearings, which can better support the planetary gear system and withstand greater radial and axial forces.
[0042] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2As shown, the first planetary carrier 37 is rotatably connected to the first cylinder 31 via the fifth bearing 64. The fifth bearing 64 provides an additional support point for the first planetary carrier 37, making it more stable during operation. By rotatably connecting to the first cylinder 31, it can limit the radial and axial displacement of the first planetary carrier 37, reduce its sway and vibration, and ensure the meshing accuracy between the planetary gears, the sun gear 34, and the fixed internal gear ring 311, thereby improving the stability and reliability of the entire winch transmission system.
[0043] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2 As shown, the end of the second cylinder 32 furthest from the first cylinder 31 is a closed end; a connecting column is fixed on the closed end located inside the second cylinder 32; the second planetary carrier 38 is rotatably connected to the connecting column through the sixth bearing 65. Compared with single bearing support, this design can significantly reduce the radial runout and axial movement of the second planetary carrier 38 under high-speed operation or heavy load conditions, ensuring the meshing accuracy of the second planetary gear 36 with the sun gear 34 and the output internal gear ring 321, and avoiding impact loads and abnormal wear caused by unstable positioning; the closed end of the second cylinder 32 serves as the fixed foundation of the connecting column, forming a rigid frame structure with the first cylinder 31, which can effectively suppress the vibration and noise of the winch during operation; the setting of the sixth bearing 65 allows part of the load of the second planetary carrier 38 (such as radial force and torque) to be directly transmitted to the second cylinder 32 through the connecting column, reducing the burden on the central shaft 33 and the fourth bearing 63.
[0044] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2 As shown, the second cylinder 32 is rotatably sleeved on the outside of the first cylinder 31 via the seventh bearing 66 and the first bearing 60. The first bearing 60 and the seventh bearing 66 form a two-point support structure, which can significantly reduce the radial runout and axial movement of the second cylinder 32 under high-speed rotation or heavy load conditions, and avoid structural deformation or vibration caused by insufficient support from a single bearing.
[0045] In the optional embodiments of this example, the seventh bearing 66 is preferably a crossed roller bearing. The rollers inside the crossed roller bearing are arranged perpendicularly to each other at 90°, which effectively prevents the rollers from tilting or rubbing against each other, avoiding an increase in rotational torque and enabling high-precision rotational motion. This helps ensure the smoothness and accuracy of the winch's lifting and lowering processes, which is crucial for applications requiring precise control of the lifting height.
[0046] The following are the relevant specifications regarding the connection and fit between the drum 50 and the reducer 30:
[0047] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 3As shown, at least one second slot 324 is provided on the outer wall of the mating ridge 322 away from the output end of the reducer 30; at least one second tooth 52 is fixedly provided on the inner wall of the mating slot, the second tooth 52 corresponds one-to-one with the second slot 324, and the second tooth 52 and the second slot 324 are in clearance fit; the first slot 323 has a first pushing surface 326, and the first tooth 51 has a first receiving surface 511; the second slot 324 has a second pushing surface, and the second tooth 52 has a second receiving surface; when the rotating output end of the reducer 30 rotates around the first direction, the first pushing surface 326 of the first slot 323 can push the corresponding first receiving surface 511 on the first tooth 51 to drive the drum 50 to rotate synchronously; and when the rotating output end of the reducer 30 rotates around the second direction, the second pushing surface of the second slot 324 can push the corresponding second receiving surface on the second tooth 52 to drive the drum 50 to rotate synchronously; the first direction is opposite to the second direction. When the output end of the reducer 30 rotates in the first direction (such as clockwise), the first pushing surface 326 of the first slot 323 cooperates with the first receiving surface 511 of the first tooth 51 to drive the drum 50 to rotate synchronously, thereby lifting or lowering the load. When the rotation direction is switched to the second direction (such as counterclockwise), the second pushing surface of the second slot 324 cooperates with the second receiving surface of the second tooth 52 to drive the drum 50 to rotate synchronously again.
[0048] In the optional solutions of this embodiment, it is more preferred that there are three first slots 323 and three second slots 324, and the first slots 323 and the second slots 324 are arranged in an alternating manner around the axis of the mating protrusion 322.
[0049] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A built-in hoisting winch, characterized in that: Includes a speed reducer, a mounting bracket, and a drum; The rotating output end of the reducer is provided with a mating protrusion, and at least one first slot is provided on the outer side wall of the mating protrusion away from the axis of the output end of the reducer. The mounting bracket can be fixedly connected to the fixed part of the reducer; One end of the drum is rotatably connected to the fixed frame, and the other end of the drum is provided with a docking groove. At least one first locking tooth is fixedly provided on the inner side wall of the docking groove. The first locking groove and the first locking tooth correspond one-to-one, and the first locking tooth and the first locking groove are in clearance fit. The mating protrusions are in line contact with the inner wall of the mating groove; in the axial direction of the mating groove, the mating protrusions on both sides of the line contact are arc-shaped surfaces; in the radial direction of the mating groove, the ends of each arc-shaped surface away from the axis of the mating groove together form the line contact.
2. The built-in hoisting winch according to claim 1, characterized in that: At least one second slot is provided on the outer wall of the docking protrusion away from the output end of the reducer; at least one second tooth is fixedly provided on the inner wall of the docking slot, and the second tooth corresponds one-to-one with the second slot. The first slot has a first pushing surface, and the first tooth has a first receiving surface; The second slot has a second pushing surface, and the second tooth has a second receiving surface; When the output end of the reducer rotates around the first direction, the first pushing surface of the first slot can push the corresponding first receiving surface on the first tooth to drive the drum to rotate synchronously; and when the output end of the reducer rotates around the second direction, the second pushing surface of the second slot can push the corresponding second receiving surface on the second tooth to drive the drum to rotate synchronously; the first direction is opposite to the second direction.
3. The built-in hoisting winch according to claim 1, characterized in that: The reducer includes a first cylinder, a second cylinder, a central shaft, a sun gear, a first planet carrier, a second planet carrier, multiple first planet gears, and multiple second planet gears; The first cylinder has a through-hole; a fixed internal gear ring is fixedly installed on the inner side wall of the first channel; The second cylinder is rotatably sleeved on the outside of the first cylinder via the first bearing; an output internal gear ring is fixedly provided on the inner wall of the second cylinder; The central shaft passes through the first channel, and one end of the central shaft is rotatably connected to the first cylinder through a second bearing; The sun gear is fixed coaxially with the central shaft; Each of the first planetary gears is circumferentially distributed around the axis of the sun gear, and each of the first planetary gears meshes with the sun gear and the fixed internal gear ring; the first planetary gears are rotatably mounted on the first planetary shaft, one end of the first planetary shaft is fixedly connected to the first planet carrier, and the other end of the first planetary shaft is fixedly connected to the second planet carrier; Each of the second planetary gears is circumferentially distributed around the axis of the sun gear, and each of the second planetary gears meshes with the sun gear and the output internal gear ring; the second planetary gears are rotatably mounted on the second planetary shaft, one end of the second planetary shaft is fixedly connected to the first planetary carrier, and the other end of the second planetary shaft is fixedly connected to the second planetary carrier; The first planetary carrier is located on the side of the first planetary gear away from the second planetary gear, and the first planetary carrier is rotatably connected to the central shaft via a third bearing; the second planetary carrier is located on the side of the second planetary gear away from the first planetary gear, and the second planetary carrier is rotatably connected to the central shaft via a fourth bearing; The number of teeth on the output internal gear ring is greater than the number of teeth on the fixed internal gear ring; The mating protrusion is fixedly mounted on the output internal gear ring.
4. The built-in hoisting winch according to claim 3, characterized in that: The first planetary carrier is rotatably connected to the first cylinder via a fifth bearing.
5. The built-in hoisting winch according to claim 3, characterized in that: The end of the second cylinder furthest from the first cylinder is a closed end; A connecting post is fixed on the closed end located inside the second cylinder; The second planetary carrier is rotatably connected to the connecting column via a sixth bearing.
6. The built-in hoisting winch according to claim 3, characterized in that: The second cylinder is rotatably sleeved on the outside of the first cylinder via the seventh bearing and the first bearing.
7. The built-in hoisting winch according to claim 6, characterized in that: The seventh bearing is a crossed roller bearing.
8. The built-in hoisting winch according to claim 1, characterized in that: It also includes a motor, the output shaft of which is fixedly connected to the input shaft of the reducer via a coupling.
9. The built-in hoisting winch according to claim 8, characterized in that: The motor is also equipped with a brake, which can limit the rotation of the motor's output shaft away from the reducer.
10. The built-in hoisting winch according to claim 2, characterized in that: There are three of each of the first and second slots, and the first and second slots are arranged in an alternating pattern around the axis of the mating protrusion.