CN218491332U - Built-in compact hydraulic winch - Google Patents

Abstract

The utility model relates to an interior concealed compact hydraulic winch, include: a reel; the rack comprises a first rack and a second rack which are arranged at intervals; a hydraulic motor; the supporting seat is rotatably arranged on the second rack, extends into the winding drum from the second mounting port of the winding drum and is fixedly connected with the inner wall of the winding drum; the two-stage planetary reduction mechanism comprises a primary planetary reduction gear set and a secondary planetary reduction gear set which are sequentially arranged along the axial direction; the inner end of the hydraulic motor is rotatably connected with the inner wall of the first installation port of the winding drum through a first rolling bearing, a first shoulder is constructed on the outer peripheral wall of the inner end of the hydraulic motor, the first rolling bearing is sleeved at the inner end of the hydraulic motor and is abutted against the first shoulder through a spacer sleeve sleeved at the inner end of the hydraulic motor, and the spacer sleeve is limited in the axial direction through a first check ring clamped at the inner end of the hydraulic motor or a second-stage planet carrier fixed on the inner end of the hydraulic motor. The hydraulic winch is more compact in structure and can be conveniently assembled.

Description

Built-in compact hydraulic winch

Technical Field

The utility model relates to a hydraulic winch technical field especially relates to a built-in compact hydraulic winch.

Background

The hydraulic winch is a hoisting device which adopts a hydraulic motor reducer to drive a winding drum to wind a steel wire rope or a chain to lift or pull a heavy object. The hydraulic winch can be used alone, can also be used as a component part in machinery such as hoisting, road building, mine lifting and the like, and is widely applied to material lifting or flat dragging of equipment such as buildings, water conservancy, forestry, mines, docks and the like due to simple operation and large rope accommodating capacity. The hydraulic winch mainly comprises a frame, a winding drum, a hydraulic motor, a control valve block, a brake, a speed reducer, a supporting shaft and the like. The traditional hydraulic winch is large in size and cannot be installed and used on hoisting equipment with narrow space due to the fact that the hydraulic winch is assembled by two independent components of a hydraulic motor and a speed reducer, a rack and the like. Particularly, the hydraulic motor and the control valve block are arranged outside the winding drum, the speed reducer is also arranged inside the winding drum as a single component, and the rope pressing block is arranged on the side face of the winding drum, so that the winding drum is large in diameter, long in axial size and large in size. For some special hoisting equipment, the installation space of the hydraulic winch is extremely limited, the existing hydraulic winch is large in size and limited by the installation space during installation, and the installation is extremely inconvenient or impossible.

To this end, chinese patent application No. CN201110078967.8 (application publication No. CN 102205933A) discloses a hydraulic winch with a built-in variable axial plunger hydraulic motor, which is applicable to various mobile hoisting equipment with strict limits on the weight and volume of the winch, and comprises a frame, a winding drum, a hydraulic motor, a valve set, a planetary gear speed reducing mechanism, a supporting shaft assembly and the like, wherein the hydraulic motor with the variable axial plunger and the planetary gear speed reducing mechanism are respectively built in a mounting seat and the winding drum; the valve group is integrated on an oil passing disc of the flow distributor; directly engaging a planetary wheel set in the planetary gear speed reducing mechanism with an inner gear ring arranged on the inner wall of the winding drum; a self-lubricating composite sleeve is used as a bearing between the winding drum and the mounting seat, an integral frame is used, and semicircular mounting holes are formed in two ends of the frame, so that the supporting shaft assembly of the hydraulic winch can be axially and bidirectionally positioned. The improvement of the structure can greatly improve the structural compactness of the hydraulic winch, shorten the axial length, reduce the volume and the weight, is favorable for the manufacturing and assembling and disassembling processes and reduces the manufacturing cost of products.

However, the above patent application has certain disadvantages, firstly, the bearing supported between the winding drum and the mounting seat is a self-lubricating composite sleeve, and this bearing structure makes the axial dimension of the hydraulic winch to be shortened to a limited extent, and is not easy to assemble. Secondly, the mounting seat and the planetary gear reduction mechanism as the hydraulic motor shell are connected with the second-stage planet gear carrier through splines generally, so that the processing difficulty of the two parts is increased, and the two parts are inconvenient to assemble.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide a structure compacter, and conveniently assemble interior concealed compact hydraulic winch.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a built-in compact hydraulic winch comprising:

a spool having opposing first and second mounting ports;

the rack comprises a first rack and a second rack which are arranged at intervals;

the hydraulic motor is arranged on the first rack, the inner end of the hydraulic motor extends into the winding drum from the first mounting port of the winding drum and is rotatably connected with the inner wall of the winding drum, and the hydraulic motor is also provided with a driving shaft horizontally extending towards the second rack;

the supporting seat is rotatably arranged on the second rack, extends into the winding drum from the second mounting port of the winding drum and is fixedly connected with the inner wall of the winding drum;

the two-stage planetary reduction mechanism is arranged in an installation cavity formed by enclosing the hydraulic motor, the supporting seat and the winding drum and is in transmission connection with a driving shaft of the hydraulic motor, the two-stage planetary reduction mechanism comprises a first-stage planetary reduction gear set and a second-stage planetary reduction gear set which are sequentially arranged along the axial direction, the second-stage planetary reduction gear set is arranged adjacent to the hydraulic motor and comprises a second sun gear in transmission connection with the first-stage planetary reduction gear set, a second-stage planet gear carrier and a second planet gear arranged on the second-stage planet gear carrier;

hydraulic motor's the inner with rotate through first antifriction bearing between the inner wall of the first installation port of reel and connect, first circular bead is constructed to the periphery wall of hydraulic motor's the inner, first antifriction bearing cover is established hydraulic motor's the inner, and establish through the cover hydraulic motor's the inner spacer sleeve supports to press on the first circular bead, the spacer sleeve is established through the card hydraulic motor is the first retaining ring on the inner or through fixing hydraulic motor is the second grade planet carrier on the inner spacing of carrying on in the axial direction.

In order to further shorten the axial length of the hydraulic winch and simplify the consideration of the limit structure of the first rolling bearing, the middle part of the end face at the inner end of the hydraulic motor is also provided with a step part which extends inwards along the axial direction, the secondary planet carrier is sleeved on the step part and is fixedly connected to the end face at the inner end of the hydraulic motor through a pin and a cylindrical pin, and the outer peripheral edge of the secondary planet carrier is exposed out of a cylindrical area limited by the outer peripheral wall at the inner end of the hydraulic motor and is abutted against the end part of the spacer sleeve.

In order to realize the firm fixation of the first rolling bearing between the winding drum and the hydraulic motor, a second shoulder is further formed on the inner peripheral wall of the first mounting port of the winding drum, and the inner side and the outer side of the first rolling bearing are respectively abutted against the first shoulder and the second shoulder.

In order to further realize the firm fixation of the first rolling bearing between the winding drum and the hydraulic motor and further ensure the rotating stability of the winding drum, a second retaining ring is also clamped on the inner peripheral wall of the first mounting port of the winding drum corresponding to the position outside the second shoulder, and the second retaining ring abuts against one side, far away from the second shoulder, of the first rolling bearing.

As an improvement, a first oil seal is further arranged between the inner end of the hydraulic motor and the inner wall of the first mounting port of the winding drum, and the first oil seal is located on the outer side of the first rolling bearing.

In order to simplify the overall structure of the two-stage planetary reduction mechanism, thereby ensuring that the structure is smaller and more compact, and reducing and shortening the size of the whole hydraulic winch in the axial direction and the radial direction, the first-stage planetary reduction gear set comprises a first sun gear, a first-stage planet gear carrier and a first planet gear arranged on the first-stage planet gear carrier, the first sun gear is coaxially connected to a driving shaft of the hydraulic motor, the first-stage planet gear carrier is provided with three first planet gear shafts which are sequentially arranged along the circumferential direction, and the number of the first planet gears is three, and the three first planet gears are correspondingly and rotatably connected to the three first planet gear shafts;

the second sun gear of the secondary planetary reduction gear set is positioned on one side, away from the supporting seat, of the first sun gear, the primary planet carrier is connected with the second sun gear through splines, the secondary planet carrier is provided with three second planet gear shafts which are sequentially arranged along the circumferential direction, and the number of the second planet gears is three, and the three second planet gears are correspondingly and rotatably connected to the three second planet gear shafts;

the inner wall of the winding drum is also provided with a first inner tooth part used for being meshed with three first planet wheels at the position corresponding to the primary planetary reduction gear set, and the inner wall of the winding drum is also provided with a second inner tooth part used for being meshed with three second planet wheels at the position corresponding to the secondary planetary reduction gear set.

For the clearance space between rational utilization supporting seat and the reel, the supporting seat wholly is located inside the reel, and include the connecting axle that the middle part of supporting seat body and self-supporting seat body outwards extended along the axial, the outer end of this connecting axle establish its second antifriction bearing through the cover with the second frame rotates to be connected, the connecting axle with space between the inner wall of reel has constituted the arrangement space that can place the voussoir that is used for fixed wire rope, still seted up on the lateral wall of reel with the window that the arrangement space link up.

When smaller axial dimensions of the hydraulic drum are required, the space between the connecting shaft and the inner wall of the drum can be correspondingly reduced, whereby there is a possibility that there is insufficient placement of the wedge, for which purpose the end of the drum has a flange, the outside of which is also provided with a rope presser.

In order to further obtain the hydraulic pressure cylinder of less axial dimension, the supporting seat includes the supporting seat body and follows the outside connecting axle that extends of axial from the middle part of supporting seat body, the supporting seat body is located in the reel, the connecting axle stretches out outside the reel to establish on it through the cover second antifriction bearing with the second frame rotates and is connected.

Compared with the prior art, the utility model has the advantages that: the first rolling bearing is adopted between the winding drum of the hydraulic winch and the hydraulic motor to realize the rotary connection between the winding drum and the hydraulic motor, so that the axial size of the hydraulic winch can be shortened as much as possible, and the structure of the hydraulic winch is more compact. On the other hand, the supporting seat not only plays a role of supporting the winding drum, but also plays a role of serving as an end cover of the two-stage planetary reduction mechanism, and the structure of the hydraulic winch is further simplified. In the preferred scheme, the arrangement space formed between the winding drum and the supporting seat can just arrange a wedge block for fixing the steel wire rope, so that the axial size of the winding drum is reduced.

Drawings

Fig. 1 is a schematic structural view of a hydraulic winch according to embodiment 1 of the present invention;

fig. 2 is a left side view of the hydraulic winch according to embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of a hydraulic winch according to embodiment 2 of the present invention;

fig. 4 is a schematic structural view of a hydraulic winch according to embodiment 3 of the present invention;

fig. 5 is a schematic structural diagram of a hydraulic winch according to embodiment 4 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the present invention, but these terms are used herein for convenience of description only and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be oriented in different directions, the directional terms are used for descriptive purposes and are not intended to be limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite or coincident with the direction of gravity.

Example 1

Referring to fig. 1 and 2, the structure of the built-in compact hydraulic winch mainly includes a frame 60, a drum 3, a hydraulic motor 1, a two-stage planetary reduction mechanism, and other main components. The frame 60 is disposed on both sides of the reel drum 3, and supports the rotation of the reel drum 3. The hydraulic motor 1 is fixedly connected to the left end of the frame 60 through a bolt 37, and a function cartridge valve and a normally closed type plate brake required by the hydraulic winch are arranged in the hydraulic motor. The support base 44 is disposed at the right end of the frame 60 and also serves as an end cover of the two-stage planetary reduction mechanism. The first mounting port 301 at the left end of the winding drum 3 is arranged at the inner end of the hydraulic motor 1, i.e. the motor housing 2, through the first rolling bearing 17, and the second mounting port 302 at the right end is fixedly connected with the support seat 44 and is mounted on the frame 60 through the second rolling bearing 43. The two-stage planetary reduction mechanism is disposed at an intermediate position inside the drum 3, and two ring gears of the two-stage planetary reduction mechanism are disposed on an inner wall of the drum 3. The hydraulic motor 1 transmits its power to the ring gear of the two-stage planetary reduction mechanism through the drive shaft 4, thereby driving the drum 3 to rotate.

Referring to fig. 1, the frame 60 includes a first frame 38, a second frame 46, and a connecting plate 40, the first frame and the second frame 46 are relatively spaced apart in the left-right direction, and are connected to each other by the connecting plate 40, and specifically, the first frame 38, the second frame 46, and the connecting plate 40 are coupled and fixed by bolts 37.

The winding drum 3 also has the functions of the winding drum and the inner gear ring of the two-stage planetary reduction mechanism, that is, a first inner gear portion 303 and a second inner gear portion 304 are integrally arranged on the inner wall of the winding drum 3 and are respectively used for matching with the planet wheels of the two-stage planetary reduction mechanism.

The hydraulic motor can adopt a common swash plate type axial plunger hydraulic motor, which is composed of a motor integrated valve block 1a, a motor shell 2, a driving shaft 4, a bearing 5, a port plate 6, a brake piston 7, a static friction plate 8, a dynamic friction plate 9, a cylinder body 10, a plunger piston shoe 11, a swash plate 12, a bearing 13, an oil seal 14 and other parts, wherein the motor integrated block 1 is integrated with functions of a balance valve 48, a pressure reducing valve 49, a shuttle valve 50 and the like (see fig. 2 in detail). The structure and the working process of the swash plate type axial plunger hydraulic motor are the prior art and are not described again.

The two-stage planetary reduction mechanism is composed of two stages, and includes a primary planetary reduction gear set and a secondary planetary reduction gear set that are arranged in order in the axial direction inside the drum 3, wherein the secondary planetary reduction gear set is arranged adjacent to the hydraulic motor 1 as compared with the primary planetary reduction gear set. The primary planetary reduction gear set includes a primary carrier 26, a first planetary gear 28, a first planetary gear shaft 27, a retainer 30, a needle roller 29, a shaft retainer 31, a first sun gear 33, and a first sun gear shaft 330. The secondary planetary reduction gear set comprises a secondary planet carrier 20, a second planet wheel shaft 21, a second planet wheel 22, a retainer ring 24, a needle roller 23, a shaft retainer ring 25 and a second sun gear 32.

The first sun gear shaft 330 is coaxially connected to the driving shaft 4 of the hydraulic motor 1, the first-stage planetary gear carrier 26 has three first planetary gear shafts 27 arranged in sequence along the circumferential direction, and the number of the first planetary gears 28 is three, and the three first planetary gear shafts 27 are correspondingly rotatably connected. The first planetary wheel shaft 27 is cantilevered on the first-stage carrier 26, and a needle roller 23 is provided between the first planetary wheel 28 and the first planetary wheel shaft 27 in a circumferential direction. The first planetary gear 28 is axially restrained and fixed on both left and right sides by a retainer 30 and a shaft retainer 31. The second sun gear 32 of the secondary planetary reduction gear set is sleeved outside the first sun gear shaft 330 and is located on one side, away from the supporting seat 44, of the first sun gear 33, the primary planetary carrier 26 is connected with the second sun gear 32 through a spline, the secondary planetary carrier 20 is provided with three second planetary gear shafts 21 which are sequentially arranged along the circumferential direction, and three second planetary gears 22 are correspondingly connected to the three second planetary gear shafts 21 in a rotating mode. A first internal toothing 303 on the inner wall of the drum 3 meshes with the three first planet wheels 28 and a second internal toothing 304 on the inner wall of the drum 3 meshes with the three second planet wheels 22. The second planet wheel shaft 21 is arranged on the secondary planet wheel carrier 20 in a cantilever manner, and the left side and the right side of the second planet wheel 22 are limited and fixed in the axial direction through retaining rings 24 and shaft retaining rings 25.

The driving shaft of the hydraulic motor is connected with the first sun gear shaft 330, the hydraulic motor transmits power to the primary planetary reduction gear set through the driving shaft 4, the secondary sun gear 32 is in spline connection with the primary planet carrier 26, and then the power is transmitted to the secondary planetary reduction gear set, and the secondary planet carrier 20 of the secondary planetary reduction gear set is fixedly connected with the motor shell 2 through the cylindrical pin 34 and the screw 35, so that the second internal tooth part of the secondary planetary reduction gear set, namely the winding drum 3, is forced to rotate. A first oil seal 15 (skeleton oil seal) is disposed at a position where the left side of the winding drum 3 is coupled to the motor housing 2, and the motor housing 2, the support base 44 and the winding drum 3 together constitute a mounting chamber for housing the two-stage planetary reduction mechanism. An oil charging and discharging plug 39 is provided in the radial direction of the drum 3 corresponding to the two-stage planetary reduction mechanism.

The drum 3 is wirelined on its outer wall and has opposite first and second mounting ports 301 and 302. The inner end of the hydraulic motor 1 (i.e., the motor housing 2) is rotatably connected to the inner wall of the first mounting port 301 of the spool 3 via a first rolling bearing 17. In order to axially and firmly limit the first rolling bearing 17, a first shoulder 101 is formed on the outer peripheral wall of the inner end of the hydraulic motor (i.e., the motor housing), and the first rolling bearing 17 is sleeved on the motor housing 2. The motor housing 2 is further sleeved with a spacer 18, a first end of the spacer 18 abuts against the first shoulder 101, and a second end of the spacer 18 abuts against a first retainer ring 19 clamped on the motor housing 2.

The inner peripheral wall of the first mounting port 301 of the spool 3 is also formed with a second shoulder 305, and the inner and outer sides (i.e., the left and right sides) of the first rolling bearing 17 abut against the first shoulder 101 and the second shoulder 305, respectively. A second retainer ring 16 is further clamped on the inner peripheral wall of the first mounting port 301 of the winding drum 3, and the second retainer ring 16 is located outside the second shoulder 305, so as to abut against the outside (the side far away from the second shoulder) of the first rolling bearing 17. Under the common limiting action of the first shoulder 101, the second shoulder 305, the spacer 18 and the second retainer ring 16, the first rolling bearing 17 can be firmly fixed between the winding drum 3 and the hydraulic motor 1, so as to further ensure the stability of the rotation of the winding drum 3,

the support seat 44 is located entirely inside the mandrel 3. The support seat 44 includes a support seat body 441 and a connecting shaft 442 extending axially outward from a middle portion of the support seat body 441. The outer end of the connecting shaft 442 is rotatably connected to the second frame 46 through a second rolling bearing 43 sleeved thereon. The second rolling bearing 43 is positioned in the axial direction by a shoulder on the connecting shaft 442 and the shaft retaining ring 45. The support base body 441 is fixed inside the spool through a hole stopper 41 to indirectly support the spool 3. The space between the connecting shaft 442 and the inner wall of the drum 3 forms an annular space for placing the wedge 42 for fixing the wire rope, and the side wall of the drum 3 is further provided with a window 307 penetrating the space.

In the embodiment, the swash plate type axial plunger hydraulic motor, the two-stage planetary reduction mechanism, the winding drum and the rack are ingeniously arranged, the design scheme has the advantages of compact structure, small volume and light weight, and the problem that the hydraulic winch is installed in a narrow space is solved. The first rolling bearing is adopted between the winding drum of the hydraulic winch and the hydraulic motor to realize the rotary connection of the winding drum and the hydraulic motor, so that the axial dimension of the hydraulic winch can be shortened as much as possible, and the structure of the hydraulic winch is more compact. On the other hand, the whole second-stage planet carrier of the two-stage planetary reduction mechanism is broken into parts, the parts are divided into a hydraulic motor (a motor shell) and the two parts, and the hydraulic motor and the two parts are connected through a cylindrical pin and a screw, so that the two parts are firmly fixed. Moreover, the supporting seat not only plays a role of supporting the winding drum, but also plays a role of serving as an end cover of the two-stage planetary reduction mechanism, and the structure of the hydraulic winch is further simplified. The arrangement space formed between the winding drum and the supporting seat can be just used for arranging wedge blocks for fixing the steel wire rope, so that the axial size of the winding drum is reduced.

Example 2

Referring to fig. 3, the present embodiment is different from embodiment 1 in that: the middle part of the end face of the inner end of the motor shell 2 is also provided with a step part 201 extending inwards along the axial direction, the second-stage planet carrier 20 is sleeved on the step part 201, meanwhile, the shaft retainer ring 19 in the figure 1 is eliminated, but the second-stage planet carrier 20 directly compresses the spacer 18 to achieve the purpose of positioning the first rolling bearing 17, and the whole processing difficulty and the assembling difficulty of the hydraulic winch are reduced. As can be seen from fig. 3, the outer peripheral edge of the secondary planetary carrier 20 is exposed outside the cylindrical area defined by the outer peripheral wall of the inner end of the hydraulic motor 1, so as to press the end of the spacer 18.

Example 3

Referring to fig. 4, the present embodiment is different from embodiment 2 in that: when the drum 3 is required to have a shorter size and the annular space between the drum 3 and the support seat 44 is insufficient to accommodate the cable wedge 42, the cable is compressed outside the flange of the drum 3 using the cable pressing block 51 and the screw 52.

Example 4

Referring to fig. 5, the present embodiment is different from embodiment 3 in that: the annular installation space between the drum 3 and the support 44 is eliminated to allow the drum 3 to have a shorter size, and the wire rope is compressed outside the flange of the drum 3 by using the rope pressing block 51 and the screw 52.

Claims (9)

1. A concealed, compact hydraulic winch comprising:

a spool (3) having opposing first (301) and second (302) mounting ports;

the device comprises a frame, a first frame (38) and a second frame (46) which are arranged at intervals;

the hydraulic motor (1) is arranged on the first rack (38), the inner end of the hydraulic motor (1) extends into the winding drum (3) from a first mounting port (301) of the winding drum (3) and is rotationally connected with the inner wall of the winding drum (3), and the hydraulic motor (1) is further provided with a driving shaft which horizontally extends towards the second rack (46);

the supporting seat (44) is rotatably arranged on the second rack (46), and the supporting seat (44) extends into the winding drum (3) from a second mounting port (302) of the winding drum (3) and is fixedly connected with the inner wall of the winding drum (3);

the two-stage planetary reduction mechanism is arranged in a mounting cavity (300) formed by enclosing the hydraulic motor (1), the supporting seat (44) and the winding drum (3) and is in transmission connection with a driving shaft of the hydraulic motor (1), and comprises a primary planetary reduction gear set and a secondary planetary reduction gear set which are sequentially arranged along the axial direction, wherein the secondary planetary reduction gear set is arranged adjacent to the hydraulic motor and comprises a second sun gear (32) in transmission connection with the primary planetary reduction gear set, a secondary planet carrier (20) and a second planet gear (22) arranged on the secondary planet carrier (20);

the method is characterized in that: the inner of hydraulic motor (1) with rotate through first antifriction bearing (17) and connect between the inner wall of the first installation port (301) of reel (3), first circular bead (101) are constructed to the periphery wall in the inner of hydraulic motor (1), first antifriction bearing (17) cover is established the inner of hydraulic motor (1) to establish through the cover spacer (18) on hydraulic motor (1) the inner support and press on first circular bead (101), spacer (18) are established through the card first retaining ring (19) on hydraulic motor (1) the inner or through fixing hydraulic motor (1) the second grade planet wheel frame (20) on the inner spacing of going on in the axial.

2. The concealed compact hydraulic winch of claim 1, wherein: the middle part of the end face of the inner end of the hydraulic motor (1) is further provided with a step part (201) extending inwards in the axial direction, the secondary planet carrier (20) is sleeved on the step part (201) and is fixedly connected to the end face of the inner end of the hydraulic motor (1) through a pin (35) and a cylindrical pin (34), and the outer peripheral edge of the secondary planet carrier (20) is exposed outside a cylindrical area limited by the outer peripheral wall of the inner end of the hydraulic motor (1) and abuts against the end part of the spacer sleeve (18).

3. The concealed compact hydraulic winch of claim 1, wherein: and a second shoulder (305) is formed on the inner peripheral wall of the first mounting port (301) of the winding drum (3), and the inner side and the outer side of the first rolling bearing (17) are respectively abutted against the first shoulder (101) and the second shoulder (305).

4. The concealed compact hydraulic winch of claim 3, wherein: and a second retaining ring (16) is clamped on the inner peripheral wall of the first mounting port (301) of the winding drum (3) at a position corresponding to the outer side of the second shoulder (305), and the second retaining ring (16) abuts against one side, away from the second shoulder (305), of the first rolling bearing (17).

5. The concealed compact hydraulic winch of claim 1, wherein: a first oil seal (15) is further arranged between the inner end of the hydraulic motor (1) and the inner wall of a first mounting port (301) of the winding drum (3), and the first oil seal (15) is located on the outer side of the first rolling bearing (17).

6. The concealed compact hydraulic winch according to any one of claims 1 to 5, wherein: the primary planetary reduction gear set comprises a first sun gear (33), a primary planet carrier (26) and first planet gears (28) arranged on the primary planet carrier (26), the first sun gear (33) is coaxially connected to a driving shaft of the hydraulic motor (1), the primary planet carrier (26) is provided with three first planet gear shafts (27) which are sequentially arranged along the circumferential direction, and the number of the first planet gears (28) is three, and the three first planet gears are correspondingly and rotatably connected to the three first planet gear shafts (27);

the second sun gear (32) of the secondary planetary reduction gear set is positioned on one side, away from the supporting seat (44), of the first sun gear (33), the primary planetary gear carrier (26) is connected with the second sun gear (32) through a spline, the secondary planetary gear carrier (20) is provided with three second planetary gear shafts (21) which are sequentially arranged along the circumferential direction, and three second planetary gears (22) are correspondingly and rotatably connected to the three second planetary gear shafts (21);

the inner wall of the winding drum (3) is also provided with a first internal tooth part (303) used for being meshed with three first planet wheels (28) at a position corresponding to the primary planetary reduction gear set, and the inner wall of the winding drum (3) is also provided with a second internal tooth part (304) used for being meshed with three second planet wheels (22) at a position corresponding to the secondary planetary reduction gear set.

7. The concealed compact hydraulic winch of claim 6, wherein: the support seat (44) is integrally positioned inside the winding drum (3) and comprises a support seat (44) body and a connecting shaft (442) extending outwards from the middle of the support seat (44) body along the axial direction, the outer end of the connecting shaft (442) is rotatably connected with the second rack (46) through a second rolling bearing (43) sleeved on the connecting shaft, a placement space (443) for placing a wedge block for fixing a steel wire rope is formed in a space between the connecting shaft (442) and the inner wall of the winding drum (3), and a window (307) communicated with the placement space (443) is further formed in the side wall of the winding drum (3).

8. The concealed compact hydraulic winch of claim 6, wherein: the end part of the winding drum (3) is provided with a flange, and the outer side of the flange is also provided with a rope pressing block (51).

9. The concealed compact hydraulic winch according to claim 6, wherein: the supporting seat (44) comprises a supporting seat (44) body and a connecting shaft (442) extending outwards from the middle of the supporting seat (44) body along the axial direction, the supporting seat (44) body is located in the winding drum (3), the connecting shaft (442) extends out of the winding drum (3), and the connecting shaft is rotatably connected with the second rack (46) through a second rolling bearing (43) sleeved on the connecting shaft.

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