Built-in hydraulic winch

Abstract

The invention relates to the technical field of hydraulic winches, and particularly discloses a built-in hydraulic winch which comprises a winding drum structure, the winding drum structure comprises a winding drum, a winding drum front end side plate and a winding drum rear end side plate, and the winding drum front end side plate and the winding drum rear end side plate are installed at the two ends of the winding drum. According to the built-in hydraulic winch, a part of the stable bearing is shielded through the first check ring, the sealing performance among the first check ring, the second check ring and the motor structure is guaranteed through the oil seal between the second check ring and the first check ring, and a part of impurities such as dust and silt are blocked through the second check ring and the third check ring; therefore, the situation that external factors such as dust and silt enter the winding drum structure and make contact with the stable bearing is avoided, the influence of the factors such as dust and silt on the stable bearing is avoided, and the service life of the stable bearing and the coaxiality of the driving shaft and the first-stage sun wheel shaft are guaranteed. And the service life and the transmission efficiency of the two-stage planetary transmission mechanism are ensured.

Description

Technical Field

[0001] This invention relates to the field of hydraulic winch technology, and specifically to a built-in hydraulic winch. Background Technology

[0002] A hydraulic winch is a lifting and traction device that uses hydraulic oil as the power medium and a hydraulic motor to drive a reduction mechanism to ultimately wind up and unwind a wire rope (or cable). It is widely used in engineering machinery, mining, and shipbuilding. Its core advantages lie in its high power density, meaning it outputs greater torque for the same volume, has a wide speed range, smooth start-stop, and can achieve overload protection through its hydraulic system, resulting in strong safety.

[0003] A patent for a hydraulic winch with a built-in planetary reducer is disclosed in document CN222204622U. The hydraulic winch with a built-in planetary reducer can effectively reduce the external size of the entire winch. When performing lifting operations, it can effectively meet the high torque lifting requirements in narrow spaces. The overall structure is compact and occupies little external space.

[0004] However, the aforementioned patent documents still have drawbacks. There is a gap between the drum body and the motor connecting plate, and there is no sealing structure between the right deep groove ball bearing and the motor connecting plate. In actual use, external dust, mud, and other impurities can easily enter the right deep groove ball bearing and the inside of the drum through the gap between the drum body and the motor connecting plate. This can lead to increased clearance and lubrication failure in the right deep groove ball bearing, affecting its normal use. It can also generate additional radial force at the connection between the drum body and the hydraulic motor, which will not only aggravate the wear at the connection but may also cause uneven power transmission, resulting in the drum body rotating with difficulty and making abnormal noises. Furthermore, if dust, mud, etc., enter the inside of the drum, it will have a certain impact on the internal components. For example, if dust, mud, etc., adhere to the planetary gears, the friction on the planetary gears will increase, affecting the normal transmission efficiency of the planetary gears. Summary of the Invention

[0005] This invention provides a built-in hydraulic winch designed to address the issue of dust, mud, and other contaminants coming into contact with the bearings.

[0006] The present invention provides a built-in hydraulic winch, comprising: The drum structure includes a drum and front and rear side plates installed at both ends of the drum. The inner wall of the drum is provided with a bearing mounting groove. The inner wall of the drum is connected with retaining ring 1, retaining ring 2 and retaining ring 3 from right to left. A stabilizing bearing, connected to the inner wall of the bearing mounting groove; The motor structure is located inside the drum. The motor structure has a positioning shoulder. Retaining ring 1, retaining ring 2 and retaining ring 3 are all located on the left side of the stabilizing bearing. The right side of retaining ring 1 and the positioning shoulder are in contact with the left side of the stabilizing bearing. An oil seal is provided between retaining ring 2 and retaining ring 1. The oil seal is sleeved on the outer surface of the motor structure. A frame assembly is connected to the drum structure. The frame assembly is used to support the drum structure. The frame assembly includes a support structure, which is connected to the rear end side plate of the drum. The support structure is used to ensure the stability of the rear end side plate of the drum during rotation. The mounting ring is connected to the inner wall of the drum. The left side of the mounting ring is connected to the gearbox cover plate by screws. The outer surface of the gearbox cover plate has multiple sealing grooves, and the inner wall of each sealing groove is provided with an O-ring.

[0007] A two-stage planetary transmission structure is located inside the drum, and the two-stage planetary transmission mechanism is used to drive the drum structure to rotate.

[0008] Preferably, the support structure includes a support bearing and a support shaft. The support shaft is divided into a large end, a middle end and a small end. The small end of the support shaft is connected to the support bearing. The middle end of the support shaft passes through the rear end side plate of the drum. The right side of the large end of the support shaft is in contact with the left side of the rear end side plate of the drum. The large end of the support shaft is connected to the rear end side plate of the drum by screws. The support bearing is connected to the frame assembly.

[0009] Preferably, the rack assembly further includes a base, a front rack, and a rear rack, with the front rack and rear rack symmetrically connected to one side of the base, and a support bearing mounted on the rear rack.

[0010] Preferably, the motor structure includes a motor housing and a hydraulic motor. A portion of the motor housing is located inside the drum. The motor housing is connected to the front frame by a screw one. The hydraulic motor is connected to the motor housing by a screw two. The hydraulic motor includes a motor body and a drive shaft, and the drive shaft is connected to the motor body.

[0011] Preferably, the two-stage planetary transmission mechanism includes a primary sun gear shaft, a primary planetary gear structure, a secondary planetary gear structure, and a secondary planetary carrier. The primary sun gear shaft is coaxially arranged with the drive shaft and connected to it. The primary sun gear shaft is located on the right side of the drive shaft. Both the primary and secondary planetary gear structures are located inside the drum structure. The secondary planetary gear structure is located on the left side of the primary planetary gear structure. The primary planetary gear structure is connected to the primary sun gear shaft, and the secondary planetary gear structure is connected to the primary planetary gear structure. The secondary planetary carrier is coaxially arranged with the motor housing. The end of the motor housing is located inside the secondary planetary carrier, and the motor housing is connected to the secondary planetary carrier. The primary planetary gear structure includes three primary planetary gear shafts, which are arranged in a circular array about the center of the primary sun gear shaft. Each of the three primary planetary gear shafts is connected to a primary planetary gear. The secondary planetary gear structure includes four secondary planetary gear shafts, which are arranged in a circular array about the center of the primary sun gear shaft. Each of the four secondary planetary gear shafts is connected to a secondary planetary gear.

[0012] Preferably, two primary planetary gear retaining rings are connected to the primary planetary gear shaft, the primary planetary gear is located between the two primary planetary gear retaining rings, and the primary planetary gear is in contact with the primary planetary gear retaining rings.

[0013] Preferably, two secondary planetary gear retaining rings are connected to the secondary planetary gear shaft, the secondary planetary gear is located between the two secondary planetary gear retaining rings, and the secondary planetary gear is in contact with the secondary planetary gear retaining rings.

[0014] Preferably, the inner wall of the drum is provided with positioning groove 1, positioning groove 2 and positioning groove 3 from right to left, with retaining ring 1 located inside positioning groove 1, retaining ring 2 located inside positioning groove 2 and retaining ring 3 located inside positioning groove 3.

[0015] The beneficial effects of this invention are: 1. The retaining rings 1 and 2 shield a portion of the stabilizing bearing, and the oil seal between retaining rings 1 and 2 and the motor structure is ensured. Retaining rings 2 and 3 also block some dust, mud, and other impurities, thus preventing external factors such as dust and mud from entering the drum structure and coming into contact with the stabilizing bearing. This also prevents the influence of dust and mud on the stabilizing bearing, ensuring the service life of the stabilizing bearing and the coaxiality of the drive shaft and the first-stage sun gear shaft, and ensuring the service life and transmission efficiency of the two-stage planetary transmission mechanism.

[0016] 2. The O-ring seal ensures the sealing between the gearbox cover and the drum. The misalignment between the large and middle ends of the support shaft and the rear end side plate of the drum further enhances the sealing between the support shaft and the rear end side plate of the drum. This prevents external factors such as dust and mud from entering the drum from the right end of the drum structure, thus ensuring the service life of components such as the stable bearing and the two-stage planetary transmission mechanism, as well as the transmission efficiency of the two-stage planetary transmission mechanism.

[0017] 3. The two-stage planetary transmission mechanism and other components are concealed inside the drum, which makes the hydraulic winch have the advantages of compact overall structure, small size and short length, thus facilitating the transportation of the hydraulic winch structure.

[0018] 4. The connection between the primary sun gear shaft and the drive shaft is a spline connection, and the connection between the secondary planetary carrier and the motor housing is a spline connection. The motor housing is mounted on the frame assembly by screws, so that when disassembling and assembling the motor structure, only the screws need to be removed and plugged in at the same time, making the overall operation simple. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 2 This is the present invention. Figure 1 A magnified structural diagram of point A in the middle.

[0021] Figure 3 This is the present invention. Figure 1 A magnified structural diagram at point B in the middle.

[0022] Figure 4 This is the present invention. Figure 1 A magnified structural diagram at point C.

[0023] Figure label: 10. Drum structure; 101. Bearing mounting groove; 11. Stabilizing bearing; 12. Retaining ring one; 13. Retaining ring two; 14. Retaining ring three; 15. Oil seal; 16. Drum; 161. Positioning groove one; 162. Positioning groove two; 163. Positioning groove three; 17. Front side plate of drum; 18. Rear side plate of drum; 20. Motor structure; 201. Positioning shoulder; 21. Motor housing; 22. Hydraulic motor; 221. Motor body; 222. Drive shaft; 223. Bearing; 224. Distribution plate; 225. Friction plate; 226. Cylinder body; 227. Plunger; 228. 1. Swashplate; 23. Screw 1; 24. Screw 2; 30. First-stage sun gear shaft; 31. Second-stage planetary carrier; 32. First-stage sun gear; 33. First-stage planetary gears; 34. First-stage planetary gear shaft; 341. First-stage planetary gear retaining ring; 35. First-stage planetary carrier; 36. Second-stage sun gear; 37. Second-stage planetary gears; 38. Second-stage planetary gear shaft; 381. Second-stage planetary gear retaining ring; 50. Base; 51. Front frame; 52. Rear frame; 53. Support bearing; 54. Support shaft; 60. Mounting ring; 61. Gearbox cover plate; 611. Sealing groove; 62. O-ring seal. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figures 1 to 4 As shown, a built-in hydraulic winch of the present invention includes a drum structure 10 and a frame assembly. The frame assembly supports the drum structure 10 to ensure stable rotation of the drum structure 10. A bearing mounting groove 101 is provided on the inner wall of the drum structure 10, and a stabilizing bearing 11 is installed on the inner wall of the bearing mounting groove 101. From right to left, a first retaining ring 12, a second retaining ring 13, and a third retaining ring 14 are sequentially connected to the inner wall of the drum structure 10. A motor structure 20 is provided inside the drum structure 10, and a positioning shoulder 201 is provided on the motor structure 20. The right side of the first retaining ring 12 and the positioning shoulder 201 are connected to the motor structure 10. The shoulder 201 of the shaft is in contact with the left side of the stabilizing bearing 11. An oil seal 15 is provided between the second retaining ring 13 and the first retaining ring 12. The oil seal 15 is a TC type oil seal. The TC type oil seal has an inner dust lip and a main sealing lip. The main sealing lip is responsible for preventing the leakage of oil, grease and other media, while the inner dust lip can prevent dust, mud and other impurities from entering. The oil seal 15 is sleeved on the outer surface of the motor structure 20. The right side of the third retaining ring 14 is in contact with the left side of the second retaining ring 13. The drum structure 10 is equipped with a two-stage planetary transmission mechanism inside. The two-stage planetary transmission mechanism is used to drive the drum structure 10 to rotate.

[0026] During the operation of the hydraulic winch, the stabilizing bearing 11 supports and positions the motor structure 20, ensuring that the center position of the motor structure 20 is coaxial with the center position of the input shaft of the two-stage planetary transmission mechanism. The retaining ring 12 not only limits the stabilizing bearing 11, preventing displacement in the lateral direction, but also partially shields it. The oil seal 15 between the retaining ring 12 and retaining ring 13 ensures the sealing between retaining rings 12, 13 and the motor structure 20. Retaining rings 13 and 14 also block some dust, mud, and other impurities, preventing external factors such as dust and mud from entering the drum structure 10 and contacting the stabilizing bearing 11. This avoids increased bearing clearance and lubrication failure in the stabilizing bearing 11, ensuring its service life and the coaxiality of the output shaft of the motor structure 20 and the input shaft of the two-stage planetary transmission mechanism, thus ensuring the smooth rotation of the drum 16.

[0027] The motor structure 20 includes a motor housing 21, a part of which is located inside the drum structure 10. The motor housing 21 is connected to the frame assembly by screw 23. A hydraulic motor 22 is connected to the motor housing 21 by screw 24. The hydraulic motor 22 can be a common swashplate piston motor. The hydraulic motor 22 is composed of a motor body 221, a drive shaft 222, a bearing 223, a distributor plate 224, a friction plate 225, a cylinder 226, a piston 227, a swashplate 228, and other parts. Since it is existing technology, its working principle is not described in detail. The drive shaft 222 is the output shaft of the motor structure 20.

[0028] The outer shell of the motor body 221 is stepped, and its end fits into the motor housing 21. By connecting the screw 24 to the outer shell of the motor body 221 and the motor housing 21, the hydraulic motor 22 and the motor housing 21 are detachably connected. Both screw 23 and screw 24 are internal hexagonal head screws.

[0029] The two-stage planetary transmission mechanism includes a first-stage sun gear shaft 30, a first-stage planetary gear structure, a second-stage planetary gear structure, and a second-stage planetary carrier 31. The first-stage sun gear shaft 30 is coaxially arranged with the drive shaft 222 and is connected to the drive shaft 222 by a spline connection. The first-stage sun gear shaft 30 is located on the right side of the drive shaft 222. Both the first-stage and second-stage planetary gear structures are located inside the drum structure 10. The second-stage planetary gear structure is located on the left side of the first-stage planetary gear structure. The first-stage planetary gear structure is connected to the first-stage sun gear shaft 30, and the second-stage planetary gear structure is connected to the first-stage planetary gear structure. The second-stage planetary carrier 31 is coaxially arranged with the motor housing 21. The end of the motor housing 21 is located inside the second-stage planetary carrier 31, and the connection between the second-stage planetary carrier 31 and the motor housing 21 is a spline connection.

[0030] The primary sun gear shaft 30 is connected to the drive shaft 222 via a spline connection, and the secondary planetary carrier 31 is connected to the motor housing 21 via a spline connection. The motor housing 21 is mounted on the frame assembly by screw 23. When the motor structure 20 needs to be removed, simply remove screw 23 and move the motor structure 20 to the left. Similarly, when the motor structure 20 needs to be installed, insert the motor housing 21 into the drum structure 10, and connect the primary sun gear shaft 30 to the drive shaft 222 via a spline connection. Connect the secondary planetary carrier 31 to the motor housing 21 via a spline connection and fix the motor housing 21 with screw 23. This makes the connection between the motor structure 20 and the drum structure 10 a plug-in type, which is convenient for disassembling and assembling the motor structure 20. The motor body 221 housing is connected to the motor housing 21 via screw 24, which makes it easy to separate the motor body 221 housing from the motor housing 21 when it is necessary to repair the parts inside the motor housing 21.

[0031] The first-stage planetary gear structure includes a first-stage sun gear 32 connected to a first-stage sun gear shaft 30. Three first-stage planetary gears 33 are connected to the first-stage sun gear 32. The three first-stage planetary gears 33 are arranged in a circular array about the center of the first-stage sun gear shaft 30. Each first-stage planetary gear 33 is connected to a first-stage planetary gear shaft 34. A first-stage planetary carrier 35 is provided inside the roll structure 10. The first-stage planetary carrier 35 is coaxially arranged with the first-stage sun gear 32. The first-stage planetary gears 33 are rotatably connected to the first-stage planetary carrier 35.

[0032] The secondary planetary gear structure includes a secondary sun gear 36 sleeved on the outer surface of the primary sun gear shaft 30. The secondary sun gear 36 is located inside the primary planetary carrier 35 and connected to the primary planetary carrier 35. Four secondary planetary gears 37 are connected to the secondary sun gear 36. The four secondary planetary gears 37 are arranged in a circular array about the center of the primary sun gear shaft 30. Each of the four secondary planetary gears 37 is connected to a secondary planetary gear shaft 38. The secondary planetary gear shaft 38 is rotatably connected to the secondary planetary carrier 31. A gear ring is connected to the inner wall of the drum structure 10, and the secondary planetary gears 37 mesh with the gear ring.

[0033] When the drive drum structure 10 rotates, the drive shaft 222 drives the primary sun gear shaft 30 to rotate via the drive hydraulic motor 22. At this time, the primary planetary carrier 35 rotates under the transmission action of the primary sun gear 32 and the primary planetary gear 33. The secondary planetary carrier 31 is fixed to the motor housing 21 by a spline connection and does not rotate. The secondary sun gear 36 rotates with the rotation of the primary planetary carrier 35, thereby causing the secondary planetary gear 37 to rotate and causing the gear ring to drive the drum structure 10 to rotate for winding and unwinding operations.

[0034] Multiple needle rollers are circumferentially arranged between the first-stage planetary gear 33 and the first-stage planetary gear shaft 34, and between the second-stage planetary gear 37 and the second-stage planetary gear shaft 38. When the hydraulic winch lifts a heavy object, the first-stage planetary gear 33 and the second-stage planetary gear 37 will rotate. At this time, through the rolling of the needle rollers, the sliding friction between the first-stage planetary gear 33 and the first-stage planetary gear shaft 34, and between the second-stage planetary gear 37 and the second-stage planetary gear shaft 38, is converted into rolling friction, thereby reducing the coefficient of friction, reducing the wear of parts, reducing power loss, and making the transmission between the first-stage planetary gear structure and the second-stage planetary gear structure more efficient. The needle rollers can also withstand radial loads, thereby ensuring the service life of the first-stage planetary gear 33, the first-stage planetary gear shaft 34, the second-stage planetary gear 37, and the second-stage planetary gear shaft 38.

[0035] The drum structure 10 includes a drum 16, both ends of which are connected by screws to a front end side plate 17 and a rear end side plate 18. The front end side plate 17 and the rear end side plate 18 have the same diameter.

[0036] The inner wall of the drum 16 is provided with positioning groove 161, positioning groove 2 162 and positioning groove 3 163 from right to left. The retaining ring 12 is located inside the positioning groove 161, the retaining ring 2 13 is located inside the positioning groove 2 162, and the retaining ring 3 14 is located inside the positioning groove 3 163. The positioning groove 3 163 is connected to the positioning groove 2 162, and the diameter of the positioning groove 3 163 is larger than the diameter of the positioning groove 2 162.

[0037] Installing retaining ring 12 inside positioning groove 161 can prevent retaining ring 12 from moving axially. Installing retaining ring 23 inside positioning groove 262 can prevent retaining ring 23 from moving axially. Installing retaining ring 34 inside positioning groove 363 can prevent retaining ring 34 from moving axially, thereby ensuring the positional stability of retaining ring 12, retaining ring 23 and retaining ring 34.

[0038] The frame assembly includes a base 50, on which a front frame 51 and a rear frame 52 are connected. The front frame 51 and the rear frame 52 are symmetrically distributed on one side of the base 50. The motor housing 21 is mounted on the front frame 51. A support structure is connected to the rear frame 52. The support structure is connected to the rear end side plate 18 of the drum. The support structure is used to ensure the stability of the rear end side plate 18 of the drum when it rotates.

[0039] The support structure includes a support bearing 53 connected to the rear frame 52. The keyway inner wall of the support bearing 53 is connected to a support shaft 54. The cross-sectional shape of the support shaft 54 ​​is stepped. The diameter of the support shaft 54 ​​gradually increases from right to left. The support shaft 54 ​​is divided into a large end, a middle end and a small end. The small end of the support shaft 54 ​​is connected to the support bearing 53. The middle end of the support shaft 54 ​​passes through the rear end side plate 18 of the drum. The right side of the large end of the support shaft 54 ​​is in contact with the left side of the rear end side plate 18 of the drum, and the large end of the support shaft 54 ​​is connected to the rear end side plate 18 of the drum by screws.

[0040] During the rotation of the drum structure 10, the support bearing 53 and the support shaft 54 ​​rotate accordingly. The rotation of the support bearing 53 and the support shaft 54 ​​supports the drum structure 10, thereby ensuring the stability of the drum structure 10 during rotation.

[0041] An mounting ring 60 is connected to the inner wall of the drum 16. The mounting ring 60 is located on the right side of the first-stage planetary gear structure, and a gearbox cover plate 61 is connected to the left side of the mounting ring 60 by screws. The outer diameter of the gearbox cover plate 61 is adapted to the inner diameter of the drum 16. Multiple sealing grooves 611 are opened on the outer surface of the gearbox cover plate 61, and O-rings 62 are provided on the inner walls of the multiple sealing grooves 611.

[0042] The O-ring 62 ensures the sealing between the gearbox cover plate 61 and the drum 16. The misalignment between the large and middle ends of the support shaft 54 ​​and the rear end side plate 18 of the drum ensures a good seal between the support shaft 54 ​​and the rear end side plate 18 of the drum. This prevents external factors such as dust and mud from entering the drum 16 from the right end of the drum structure 10, thus ensuring the normal transmission efficiency and service life of the drum 16's internal structures, such as the first-stage planetary gear structure and the second-stage planetary gear structure.

[0043] Two primary planetary gear retaining rings 341 are connected to the primary planetary gear shaft 34. The primary planetary gear 33 is located between the two primary planetary gear retaining rings 341 and is in contact with the primary planetary gear retaining rings 341. Two secondary planetary gear retaining rings 381 are connected to the secondary planetary gear shaft 38. The secondary planetary gear 37 is located between the two secondary planetary gear retaining rings 381 and is in contact with the secondary planetary gear retaining rings 381.

[0044] The first-stage planetary gear 33 and the second-stage planetary gear 37 are axially positioned by the first-stage planetary gear retainer ring 341 and the second-stage planetary gear retainer ring 381, which prevents the first-stage planetary gear 33 and the second-stage planetary gear 37 from moving in the axial direction, ensures that the first-stage planetary gear 33 is accurately meshed with the first-stage sun gear 32, ensures that the second-stage planetary gear 37 is accurately meshed with the second-stage sun gear 36, and maintains the stability of the first-stage planetary gear 33 and the second-stage planetary gear 37.

[0045] 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," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A built-in hydraulic winch, characterized in that, include: The drum structure (10) includes a drum (16) and a front end side plate (17) and a rear end side plate (18) installed at both ends of the drum (16). The inner wall of the drum (16) is provided with a bearing mounting groove (101). The inner wall of the drum (16) is connected with retaining ring one (12), retaining ring two (13) and retaining ring three (14) from right to left. A stabilizing bearing (11) is connected to the inner wall of the bearing mounting groove (101); The motor structure is located inside the drum (16). The motor structure (20) is provided with a positioning shoulder (201). The first retaining ring (12), the second retaining ring (13) and the third retaining ring (14) are all located on the left side of the stabilizing bearing (11). The right side of the first retaining ring (12) and the positioning shoulder (201) are in contact with the left side of the stabilizing bearing (11). An oil seal (15) is provided between the second retaining ring (13) and the first retaining ring (12). The oil seal (15) is sleeved on the outer surface of the motor structure (20). A frame assembly is connected to the drum structure (10). The frame assembly is used to support the drum structure (10). The frame assembly includes a support structure, which is connected to the rear end side plate (18) of the drum. The support structure is used to ensure the stability of the rear end side plate (18) of the drum when it rotates. The mounting ring (60) is connected to the inner wall of the drum (16). The left side of the mounting ring (60) is connected to the gearbox cover plate (61) by screws. The outer surface of the gearbox cover plate (61) is provided with multiple sealing grooves (611), and the inner wall of each of the multiple sealing grooves (611) is provided with an O-ring (62). A two-stage planetary transmission structure is set inside the drum (16), and the two-stage planetary transmission mechanism is used to drive the drum structure (10) to rotate.

2. The built-in hydraulic winch according to claim 1, characterized in that, The support structure includes a support bearing (53) and a support shaft (54). The support shaft (54) is divided into a large end, a middle end and a small end. The small end of the support shaft (54) is connected to the support bearing (53). The middle end of the support shaft (54) passes through the rear end side plate (18) of the drum. The right side of the large end of the support shaft (54) is in contact with the left side of the rear end side plate (18) of the drum. The large end of the support shaft (54) is connected to the rear end side plate (18) of the drum by screws. The support bearing (53) is connected to the frame assembly.

3. A built-in hydraulic winch according to claim 2, characterized in that, The rack assembly also includes a base (50), a front rack (51) and a rear rack (52), with the front rack (51) and the rear rack (52) symmetrically connected on one side of the base (50), and a support bearing (53) mounted on the rear rack (52).

4. A built-in hydraulic winch according to claim 1, characterized in that, The motor structure (20) includes a motor housing (21) and a hydraulic motor (22). A portion of the motor housing (21) is located inside the drum (16). The motor housing (21) is connected to the front frame (51) by screw one (23). The hydraulic motor (22) is connected to the motor housing (21) by screw two (24). The hydraulic motor (22) includes a motor body (221) and a drive shaft (222). The drive shaft (222) is connected to the motor body (221).

5. A built-in hydraulic winch according to claim 4, characterized in that, The two-stage planetary transmission mechanism includes a first-stage sun gear shaft (30), a first-stage planetary gear structure, a second-stage planetary gear structure, and a second-stage planetary carrier (31). The first-stage sun gear shaft (30) is coaxially arranged with the drive shaft (222) and connected to the drive shaft (222). The first-stage sun gear shaft (30) is located on the right side of the drive shaft (222). The first-stage planetary gear structure and the second-stage planetary gear structure are both located inside the drum structure (10). The second-stage planetary gear structure is located on the left side of the first-stage planetary gear structure. The first-stage planetary gear structure is connected to the first-stage sun gear shaft (30), and the second-stage planetary gear structure is connected to the first-stage planetary gear structure. The second-stage planetary carrier (31) is connected to the drive shaft (222). The outer casing (21) is coaxially arranged, and the end of the motor casing (21) is located inside the secondary planetary carrier (31). The motor casing (21) is connected to the secondary planetary carrier (31). The primary planetary gear structure includes three primary planetary gear shafts (34). The three primary planetary gear shafts (34) are arranged in a circular array about the center of the primary sun gear shaft (30). Each of the three primary planetary gear shafts (34) is connected to a primary planetary gear (33). The secondary planetary gear structure includes four secondary planetary gear shafts (38). The four secondary planetary gear shafts (38) are arranged in a circular array about the center of the primary sun gear shaft (30). Each of the four secondary planetary gear shafts (38) is connected to a secondary planetary gear (37).

6. A built-in hydraulic winch according to claim 5, characterized in that, Two primary planetary gear retaining rings (341) are connected to the primary planetary gear shaft (34). The primary planetary gear (33) is located between the two primary planetary gear retaining rings (341), and the primary planetary gear (33) is in contact with the primary planetary gear retaining rings (341).

7. A built-in hydraulic winch according to claim 5, characterized in that, Two secondary planetary gear retaining rings (381) are connected to the secondary planetary gear shaft (38). The secondary planetary gear (37) is located between the two secondary planetary gear retaining rings (381), and the secondary planetary gear (37) is in contact with the secondary planetary gear retaining rings (381).

8. A built-in hydraulic winch according to claim 1, characterized in that, The inner wall of the drum (16) is provided with positioning groove 1 (161), positioning groove 2 (162) and positioning groove 3 (163) from right to left. Retaining ring 1 (12) is located inside positioning groove 1 (161), retaining ring 2 (13) is located inside positioning groove 2 (162), and retaining ring 3 (14) is located inside positioning groove 3 (163).

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