Hydraulic motor planetary reducer with forced cooling

Abstract

The application relates to the technical field of mechanical transmission equipment, and discloses a hydraulic motor planetary reducer with forced cooling, which comprises a sun gear, an inner gear ring, a planet wheel and a planet carrier, the sun gear is engaged with a plurality of planet wheels, the planet wheel is engaged with the inner gear ring, the planet wheel is rotatably installed on the planet carrier, a power assembly comprises a hydraulic motor, the output end of the hydraulic motor is connected with the sun gear, a forced cooling assembly comprises a rotating shaft which is arranged in the sun gear, and the outer circumferential surface of the rotating shaft is fixed with spiral blades. The rotating shaft which is fixedly connected with the planet carrier is arranged in the sun gear, the spiral blades are arranged on the rotating shaft, the rotating speed difference between the sun gear and the planet carrier is utilized in the transmission process, the spiral blades and the inner wall of the sun gear rotate relatively, and the extraction and axial conveying of the cooling liquid can be completed by the movement of the internal mechanical components.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission equipment technology, specifically to a hydraulic motor planetary reducer with forced cooling. Background Technology

[0002] Hydraulic motor planetary reducers are widely used in engineering machinery and industrial transmission systems due to their compact structure, large transmission ratio, and high load-bearing capacity. During actual operation, the sun gear, planet gears, and internal gear ring within the reducer require high-speed and high-torque power transmission, generating significant frictional heat at the gear meshing surfaces and supporting bearings. If this heat cannot be dissipated promptly and the gear surfaces are not kept lubricated, it can lead to accelerated gear wear, reduced transmission efficiency, and even damage to components due to localized overheating.

[0003] Currently, conventional planetary gear reducers primarily employ internal splash lubrication or external forced circulation systems to address cooling and lubrication issues. With internal splash lubrication, the reducer relies on the agitation of the bottom gear to deliver oil to each meshing part. However, during high-speed operation, the centrifugal force generated by the rotating components causes a large amount of oil to be thrown outwards, resulting in insufficient fluid coverage at the central sun gear meshing point. Simultaneously, the high-speed agitation itself generates additional heat and power loss. To improve cooling in the central area, some equipment incorporates an external forced circulation system, pumping coolant into the reducer via an external power pump and external piping. While this method improves cooling capacity, it significantly increases the overall size and complexity of the equipment. External piping is susceptible to damage and leakage under vibration conditions, and the additional power source increases manufacturing and maintenance costs. Furthermore, existing internal flow guide structures lack effective locking mechanisms when the equipment is stopped or operating at low speeds. Coolant in the internal channels is prone to backflow or ineffective loss due to gravity, making it difficult to quickly establish effective lubrication and cooling medium circulation during the initial startup phase, thus affecting the equipment's lifespan. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hydraulic motor planetary reducer with forced cooling, which solves the problem that the sun gear meshing point, located at the center, is difficult to obtain sufficient fluid coverage, while the high-speed oil churning action itself also generates additional heat and power loss.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic motor planetary reducer with forced cooling, comprising a transmission assembly including a sun gear, an internal gear ring, planet gears and a planet carrier, wherein the sun gear meshes with a plurality of the planet gears, the planet gears mesh with the internal gear ring, and the planet gears are rotatably mounted on the planet carrier;

[0006] The power assembly includes a hydraulic motor, the output of which is connected to the sun gear;

[0007] The forced cooling assembly includes a rotating shaft passing through the interior of the sun gear, with helical blades fixed to the outer circumferential surface of the rotating shaft. The rotating shaft is fixedly connected to the planet carrier and is arranged coaxially with the sun gear. An axially extending fluid channel is formed between the helical blades and the inner wall of the sun gear.

[0008] A centrifugal drainage assembly has a drainage channel extending radially within the sun gear. The centrifugal drainage assembly is assembled within the drainage channel and includes an elastic reset member and a blocking member. The blocking member is slidably engaged with the drainage channel and has a first position where it blocks the drainage channel under the elastic force of the elastic reset member, and a second position where it slides radially outward against the elastic force to open the drainage channel.

[0009] Preferably, a connecting slot is provided at one end of the sun gear, the output shaft of the hydraulic motor is inserted into the connecting slot, and a spline groove is provided on the outer side of the output end of the planetary carrier.

[0010] Preferably, the centrifugal drainage assembly includes a baffle, a positioning plate, a connecting rod, a limiting plate, a stop block, and a pressure spring. The positioning plate and the baffle are both fixed in the discharge channel. The connecting rod is slidably disposed on the positioning plate. The baffle is provided with a flow opening.

[0011] Preferably, the stop block serves as the sealing element and is fixedly mounted on the connecting rod, the limiting plate is fixed on the connecting rod, and the pressure spring serves as the elastic reset element and is sleeved on the connecting rod. The two ends of the pressure spring abut against the positioning plate and the stop block, respectively. In the first position state, the surface of the stop block is in contact with the baffle and covers the flow opening.

[0012] Preferably, the sun gear has a storage cavity inside and a suction port on its side wall, with the two ends of the suction port connected to an external storage component and the storage cavity, respectively.

[0013] Preferably, the forced cooling assembly further includes a slide rod and a piston, the piston being slidably disposed within the storage cavity and in contact with the inner wall of the storage cavity, one end of the slide rod being fixedly connected to the piston, and the other end of the slide rod penetrating radially through the side wall of the sun gear and extending to the outside of the sun gear.

[0014] Preferably, the forced cooling assembly further includes mounting posts, a ring, and an arc-shaped plate. The ring is fixedly mounted on one side of the hydraulic motor by multiple mounting posts, and the arc-shaped plate is fixed on the inner circumferential wall of the ring.

[0015] Preferably, the other end of the slide bar abuts against the inner contour surface of the arc-shaped plate, the internal space of the storage cavity is connected to the liquid inlet end of the discharge channel, and the liquid outlet end of the discharge channel is arranged towards the planetary gear.

[0016] Preferably, the reducer further includes a motor mounting plate and an internal gear ring mounting plate. The housing of the hydraulic motor is fixedly mounted on the motor mounting plate, and the external part of the internal gear ring is fixedly mounted on the internal gear ring mounting plate. A first bearing is sleeved between the inner ring of the internal gear ring mounting plate and the outer ring of the sun gear, and a second bearing is sleeved between the inner ring of the internal gear ring mounting plate and the outer ring of the planet carrier.

[0017] Preferably, the reducer further includes a reducer cover and an elastic washer, the reducer cover being disposed on the outside of the planetary carrier, and the elastic washer being disposed on the housing of the hydraulic motor.

[0018] This invention provides a hydraulic motor planetary reducer with forced cooling. It has the following advantages:

[0019] 1. This invention utilizes a rotating shaft fixedly connected to the planetary carrier inside the sun gear, with helical blades mounted on the shaft. The rotational speed difference between the sun gear and the planetary carrier during transmission causes the helical blades to rotate relative to the inner wall of the sun gear. Combined with a reciprocating suction structure consisting of an arc-shaped plate, a sliding rod, and a piston, the reducer eliminates the need for an external power pump. It can complete the extraction and axial transport of coolant solely through the movement of its internal mechanical components, simplifying the overall equipment structure and reducing energy consumption.

[0020] 2. This invention incorporates a centrifugal drainage assembly within the sun gear, consisting of a stop block, connecting rod, and pressure spring. This assembly utilizes the centrifugal force generated by the sun gear's rotation to control the opening and closing of the drainage channel. During high-speed operation, the centrifugal force overcomes the spring force to open the channel; at low speeds or when the machine stops, the spring pushes the stop block to reset and close the channel. This structure achieves automatic control of the coolant drainage status, ensuring forced cooling during equipment operation and under high heat generation conditions, and preventing internal coolant leakage when the equipment stops.

[0021] 3. This invention features a discharge channel located inside the sun gear, with the outlet facing the planetary gears. The pressurized coolant, transported by helical blades, is directly sprayed from the inside out through the discharge channel to the meshing surfaces of the sun gear and planetary gears, and the planetary gears and internal gear ring, after the centrifugal discharge assembly is activated. This directional spray structure directly removes heat generated by friction in the transmission components, while simultaneously providing fluid lubrication for the gear meshing surfaces and bearings within the enclosed cavity, thus improving the transmission stability and service life of the reducer. Attached Figure Description

[0022] Figure 1 This is a first-view perspective perspective view of the present invention;

[0023] Figure 2 This is a second-view perspective perspective view of the present invention;

[0024] Figure 3 This is an exploded view of the overall structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the hydraulic motor of the present invention;

[0026] Figure 5 This is a schematic diagram of the arc-shaped plate of the present invention;

[0027] Figure 6 This is a schematic diagram of the sun gear of the present invention;

[0028] Figure 7 This is a schematic diagram of the storage cavity of the present invention;

[0029] Figure 8 This is a schematic diagram of the helical blade of the present invention;

[0030] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0031] The components include: 1. Motor mounting plate; 2. Internal gear ring mounting plate; 3. Hydraulic motor; 4. Sun gear; 5. First bearing; 6. Second bearing; 7. Internal gear ring; 8. Planetary gears; 9. Planetary carrier; 10. Reducer cover; 11. Elastic washer; 12. Shaft; 13. Helical blade; 14. Mounting column; 15. Ring; 16. Arc plate; 17. Connecting slot; 18. Inlet; 19. Storage chamber; 20. Slide rod; 21. Piston; 22. Discharge channel; 23. Baffle; 24. Positioning plate; 25. Connecting rod; 26. Limiting plate; 27. Stop block; 28. Pressure spring; 29. ​​Spline groove. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see the appendix Figure 1 - Appendix Figure 9This invention provides a hydraulic motor planetary reducer with forced cooling, comprising an external support structure, a transmission component, a power component, a forced cooling component, and a centrifugal drainage component. The assembly and spatial arrangement of the components together achieve the reduction output and the adaptive circulation of the internal coolant.

[0034] The external base frame and support system of the reducer includes a motor mounting plate 1, an internal gear ring mounting plate 2, and a reducer cover 10. The housing of the hydraulic motor 3 is fixedly mounted on the motor mounting plate 1, providing a stable power source base for the entire reducer. The internal gear ring 7 is externally fixedly mounted on the internal gear ring mounting plate 2, keeping the internal gear ring 7 stationary during operation. An elastic washer 11 is provided on the housing of the hydraulic motor 3. This elastic washer 11 deforms under pressure during assembly, filling assembly gaps and increasing the sealing performance of the connection. To ensure the coaxiality and smooth operation of the internal rotating parts, a first bearing 5 is fitted between the inner ring of the internal gear ring mounting plate 2 and the outer ring of the sun gear 4, and a second bearing 6 is fitted between the inner ring of the internal gear ring mounting plate 2 and the outer ring of the planetary carrier 9. The reducer cover 10 covers the outside of the planetary carrier 9, sealing the gear transmission area and preventing external impurities from entering and internal fluid leakage.

[0035] The power assembly is centered around a hydraulic motor 3, whose output end is connected to the sun gear 4 in the transmission assembly. Specifically, one end of the sun gear 4 has a connecting slot 17, into which the output shaft of the hydraulic motor 3 is directly inserted. Torque is directly transmitted through a shaft-hole fit or a key-like anti-rotation structure. When the sun gear 4 rotates, its external teeth mesh with multiple planetary gears 8 evenly distributed circumferentially, driving the planetary gears 8 to rotate. Since the planetary gears 8 simultaneously mesh with a fixed internal gear ring 7, they revolve along the internal tooth trajectory of the internal gear ring 7 while rotating on their own axis. The planetary gears 8 are rotatably mounted on the pins of the planet carrier 9. The revolving motion of the planetary gears 8 drives the planet carrier 9 to rotate around its central axis, thus completing the conversion from high speed to low speed and high torque. The output end of the planet carrier 9 has a spline groove 29 on its outer side, used to engage with the internal splines of external mechanical structures to output power. In this transmission structure, the speed of the sun gear 4, which serves as the power input, is higher than the speed of the planet carrier 9, which serves as the power output.

[0036] The device integrates a forced cooling assembly for drawing and delivering coolant during operation. This forced cooling assembly includes an axial spiral pumping structure based on relative rotational motion. This structure includes a rotating shaft 12 passing through the center of the sun gear 4, coaxially arranged with the sun gear 4, and one end of the shaft 12 fixedly connected to the planetary carrier 9. Continuous spiral blades 13 are fixed to the outer circumferential surface of the shaft 12. When the reducer operates, the shaft 12 rotates at a lower speed with the planetary carrier 9, while the sun gear 4 rotates at a higher speed driven by the hydraulic motor 3. The speed difference between the two causes relative motion between the inner wall of the sun gear 4 and the spiral blades 13 on the shaft 12. An axially extending fluid channel is formed between the outer edge of the spiral blades 13 and the inner wall of the sun gear 4. Through this spiral propulsion generated by relative rotation, the coolant is continuously pushed and delivered along the fluid channel towards the centrifugal discharge assembly.

[0037] Based on the spiral pumping structure, the forced cooling assembly also includes a structure that converts rotational motion into radial pumping. A ring 15 is fixedly mounted on one side of the hydraulic motor 3 via multiple mounting posts 14, keeping the ring 15 stationary relative to the housing of the hydraulic motor 3. An arc-shaped plate 16 is fixed to the inner circumferential wall of the ring 15; the inner surface of this arc-shaped plate 16 forms a cam profile surface with eccentricity or undulations. A storage chamber 19 is provided inside the sun gear 4, and a suction port 18 is provided on its side wall. The two ends of the suction port 18 are respectively connected to an external storage component and the storage chamber 19; the external storage component here is specifically a reservoir at the bottom of the reducer housing or an external coolant tank. A piston 21 is slidably disposed within the storage chamber 19, with its outer cylindrical surface in contact with and maintaining a sliding seal against the inner wall of the storage chamber 19. One end of a sliding rod 20 is fixedly connected to the piston 21, and the other end of the sliding rod 20 radially penetrates the side wall of the sun gear 4 and extends to the outside. The outer end of the slide rod 20 abuts against the inner contour surface of the stationary arc-shaped plate 16. When the sun gear 4 rotates at high speed carrying the slide rod 20, the end of the slide rod 20 slides along the inner contour surface of the arc-shaped plate 16. The radial change of the contour forces the slide rod 20 to reciprocate linearly in the radial direction within the sun gear 4. This movement drives the piston 21 to reciprocate within the storage chamber 19, thereby drawing coolant into the storage chamber 19 through the intake port 18 and compressing the coolant.

[0038] The coolant, drawn and pressurized by the forced cooling assembly, is discharged directionally via a centrifugal discharge assembly. A discharge channel 22 extending radially is provided within the sun gear 4. The internal space of the storage chamber 19 is connected to the inlet end of the discharge channel 22, while the outlet end of the discharge channel 22 faces outwards towards the planetary gear 8. The centrifugal discharge assembly is assembled within the discharge channel 22, forming an automatic valve structure controlled by centrifugal force. The centrifugal discharge assembly includes a baffle 23, a positioning plate 24, a connecting rod 25, a limiting plate 26, a stop block 27, and a pressure spring 28. Both the baffle 23 and the positioning plate 24 are fixedly installed inside the discharge channel 22. The baffle 23 has a flow opening allowing fluid to pass through. The connecting rod 25 is arranged radially and slidably mounted on the positioning plate 24, allowing for radial displacement. Specifically, the stop block 27 is fixedly mounted on the end of the connecting rod 25 near the baffle 23; the limiting plate 26 is also fixed to the connecting rod 25. A pressure spring 28 is sleeved on a connecting rod 25, and the two ends of the pressure spring 28 abut against a positioning plate 24 fixed in the channel and a stop block 27 that moves with the rod, respectively.

[0039] The centrifugal drainage assembly has two operating states: a first position and a second position. When the reducer is stopped or the hydraulic motor 3 is driven at a very low speed, the centrifugal force generated by the system is small. At this time, the elastic force of the pressure spring 28 plays a dominant role, pushing the stop block 27 and the connecting rod 25 inward to the first position. In this position, the surface of the stop block 27 is tightly attached to the baffle 23 and completely covers its flow opening, preventing coolant from flowing out through the drainage channel 22. When the hydraulic motor 3 drives the sun gear 4 to rotate at high speed at its normal operating speed, the stop block 27 fixed on the connecting rod 25 rotates at high speed and generates an outward centrifugal force. When this centrifugal force increases to a level sufficient to overcome the elastic force of the pressure spring 28, it causes the connecting rod 25 to slide radially outward on the positioning plate 24, and the stop block 27 moves outward and disengages from the surface of the baffle 23, reaching the second position. At this time, the flow opening on the baffle 23 is opened, and the drainage channel 22 is open. The coolant, supplied and pressurized by the forced cooling assembly, smoothly passes through the overflow opening and is ejected from its outlet end along the discharge channel 22. Since the outlet end faces the planetary gear 8, the ejected fluid directly acts on the meshing surfaces of the sun gear 4 and planetary gear 8, as well as the planetary gear 8 and internal gear ring 7, achieving real-time forced cooling and lubrication during high-speed, heavy-load operation of the equipment. When the equipment stops, the decrease in rotational speed causes the centrifugal force to weaken, and the pressure spring 28 pushes the stop block 27 back to the first position, locking the channel.

[0040] Working Principle: When the equipment is in operation, power transmission, fluid extraction and conveying, and centrifugal drainage processes occur synchronously with the operation of the mechanical structure. The output shaft of the hydraulic motor 3 is inserted into the connecting slot 17, driving the sun gear 4 to rotate at high speed. The external gears of the sun gear 4 drive the rotation of multiple planet gears 8 evenly distributed around it. Since the internal gear ring 7 is fixed to the internal gear ring mounting plate 2 and remains stationary, the planet gears 8 revolve along the internal gear trajectory of the internal gear ring 7 while rotating on their own axis. The revolving motion of the planet gears 8 is transmitted to the planet carrier 9, driving the planet carrier 9 to rotate around the central axis of the reducer. The high-speed power input from the sun gear 4 is converted into low-speed, high-torque power output from the planet carrier 9 through the planetary gear mechanism, and the planet carrier 9 then drives the external structure through the outer spline groove 29. During this power transmission process, a stable speed difference is generated between the sun gear 4 and the planet carrier 9.

[0041] During the high-speed rotation of the sun gear 4, the slide rod 20, which passes through the side wall of the sun gear 4, moves in a circular motion synchronously with the sun gear 4. One end of the slide rod 20 extending to the outside of the sun gear 4 continuously abuts against the inner contour surface of the stationary arc-shaped plate 16. The arc-shaped plate 16 is fixed to the inner wall of the ring 15, and the ring 15 is fixed to one side of the hydraulic motor 3 via the mounting post 14. Due to the radial dimension change of the inner contour surface of the arc-shaped plate 16, the slide rod 20 experiences alternating radial thrust as it slides along the contour surface, thus performing radial reciprocating linear motion within the side wall of the sun gear 4. The reciprocating motion of the slide rod 20 directly drives the piston 21 to pull and compress within the storage cavity 19. When the piston 21 slides outward, the internal volume of the storage cavity 19 increases, generating negative pressure, drawing coolant from the external storage components into the storage cavity 19 through the suction port 18; when the piston 21 slides inward, the internal volume of the storage cavity 19 decreases, pressurizing the coolant entering the storage cavity 19.

[0042] After being pressurized, the coolant is discharged from the storage chamber 19 and enters the fluid channel formed between the helical blades 13 and the inner wall of the sun gear 4. At this time, the shaft 12 is fixed on the planetary carrier 9, which is rotating at a low speed, while the external sun gear 4 is rotating at a high speed. The speed difference between the two causes the helical blades 13 attached to the outer circumference of the shaft 12 to undergo relative displacement with the inner wall of the sun gear 4. Relying on this relative rotational motion, the helical blades 13 continuously deliver the pressurized coolant axially into the discharge channel 22.

[0043] The coolant entering the discharge channel 22 is automatically controlled by a centrifugal drainage assembly installed within the channel 22 based on the equipment's operating speed. When the reducer is in a low-speed state during shutdown or initial startup, the sun gear 4 rotates at a low speed, resulting in a smaller centrifugal force generated by the stop block 27 and connecting rod 25, which rotate synchronously with the sun gear 4. At this time, the elastic force of the pressure spring 28 fitted on the connecting rod 25 is greater than the centrifugal force. One end of the pressure spring 28 abuts against the positioning plate 24, and the other end abuts against the stop block 27, pushing the stop block 27 tightly against the surface of the baffle 23, placing the stop block 27 in the first position of blocking the discharge channel 22. The flow opening on the baffle 23 is covered, and the coolant is trapped inside the sun gear 4.

[0044] When the hydraulic motor 3 drives the sun gear 4 to its normal operating high speed, the stop block 27 performs high-speed circular motion, and the centrifugal force generated by its own mass increases rapidly. When this centrifugal force overcomes the elastic force of the pressure spring 28, the stop block 27, together with the connecting rod 25, slides radially outward on the positioning plate 24, and the limiting plate 26 moves synchronously with the connecting rod 25. The stop block 27 disengages from the surface of the baffle 23 and reaches the second position. At this time, the flow opening on the baffle 23 is opened, and the discharge channel 22 is opened. The coolant pressurized by the piston 21 and delivered here by the spiral blade 13 is sprayed outward along the opened discharge channel 22. Because the outlet end of the discharge channel 22 is set towards the planetary gear 8, the high-pressure coolant is directly sprayed onto the meshing surfaces of the sun gear 4 and the planetary gear 8, and the planetary gear 8 and the internal gear ring 7, carrying away the heat generated by the heavy meshing of the gears and providing a lubricating oil film. During this process, the first bearing 5 and the second bearing 6, being inside the cavity formed by the internally enclosed reducer cover 10 and the motor mounting plate 1, will also receive fluid lubrication simultaneously.

[0045] When the equipment stops working or the speed drops significantly, the speed of the sun gear 4 decreases, and the centrifugal force acting on the stop block 27 decreases accordingly. The pressure spring 28 releases its elastic potential energy, pushing the stop block 27 to slide radially inward and re-fit against the surface of the baffle 23, sealing the overflow opening and restoring the discharge channel 22 to the closed state, preventing ineffective loss of coolant when the machine is stopped.

Claims

1. A planetary reducer for a hydraulic motor with forced cooling, characterized in that, include: The transmission assembly includes a sun gear (4), an internal gear ring (7), planet gears (8) and a planet carrier (9), wherein the sun gear (4) meshes with a plurality of the planet gears (8), the planet gears (8) mesh with the internal gear ring (7), and the planet gears (8) are rotatably mounted on the planet carrier (9); The power assembly includes a hydraulic motor (3), the output end of which is connected to the sun gear (4); The forced cooling assembly includes a rotating shaft (12) passing through the sun gear (4), with a helical blade (13) fixed on the outer circumferential surface of the rotating shaft (12). The rotating shaft (12) is fixedly connected to the planet carrier (9), and the rotating shaft (12) is coaxially arranged with the sun gear (4). An axially extending fluid channel is formed between the helical blade (13) and the inner wall of the sun gear (4). The centrifugal drain assembly has a drain channel (22) extending radially within the sun gear (4). The centrifugal drain assembly is assembled within the drain channel (22) and includes an elastic reset member and a blocking member. The blocking member is slidably engaged with the drain channel (22) and has a first position where it blocks the drain channel (22) under the elastic force of the elastic reset member, and a second position where it slides radially outward against the elastic force to open the drain channel (22). The sun gear (4) has a storage cavity (19) inside, and the sun gear (4) has a suction port (18) on its side wall. The two ends of the suction port (18) are respectively connected to the external storage component and the storage cavity (19). The forced cooling assembly also includes a slide rod (20) and a piston (21). The piston (21) is slidably disposed in the storage cavity (19) and fits against the inner wall of the storage cavity (19). One end of the slide rod (20) is fixedly connected to the piston (21), and the other end of the slide rod (20) passes radially through the side wall of the sun gear (4) and extends to the outside of the sun gear (4). The forced cooling assembly also includes mounting posts (14), a ring (15) and an arc plate (16). The ring (15) is fixedly mounted on one side of the hydraulic motor (3) by multiple mounting posts (14), and the arc plate (16) is fixed on the inner circumferential wall of the ring (15). The other end of the slide bar (20) abuts against the inner contour surface of the arc plate (16), the internal space of the storage cavity (19) is connected to the liquid inlet end of the discharge channel (22), and the liquid outlet end of the discharge channel (22) is arranged towards the planetary gear (8).

2. The hydraulic motor planetary reducer with forced cooling according to claim 1, characterized in that, The sun gear (4) has a connecting slot (17) at one end, the output end of the hydraulic motor (3) is inserted into the connecting slot (17), and the planet carrier (9) has a spline groove (29) on the outside of the output end.

3. A hydraulic motor planetary reducer with forced cooling according to claim 1, characterized in that, The centrifugal drainage assembly includes a baffle (23), a positioning plate (24), a connecting rod (25), a limiting plate (26), a stop block (27), and a pressure spring (28). The positioning plate (24) and the baffle (23) are both fixed in the discharge channel (22). The connecting rod (25) is slidably disposed on the positioning plate (24). The baffle (23) is provided with an overflow opening.

4. A hydraulic motor planetary reducer with forced cooling according to claim 3, characterized in that, The stop block (27) is fixedly mounted on the connecting rod (25) as the sealing component. The limiting plate (26) is fixed on the connecting rod (25). The pressure spring (28) is sleeved on the connecting rod (25) as the elastic reset component. The two ends of the pressure spring (28) abut against the positioning plate (24) and the stop block (27) respectively. In the first position state, the surface of the stop block (27) is attached to the baffle (23) and covers the flow opening.

5. A hydraulic motor planetary reducer with forced cooling according to claim 1, characterized in that, The reducer also includes a motor mounting plate (1) and an internal gear ring mounting plate (2). The housing of the hydraulic motor (3) is fixedly mounted on the motor mounting plate (1), and the external of the internal gear ring (7) is fixedly mounted on the internal gear ring mounting plate (2). A first bearing (5) is sleeved between the inner ring of the internal gear ring mounting plate (2) and the outer ring of the sun gear (4), and a second bearing (6) is sleeved between the inner ring of the internal gear ring mounting plate (2) and the outer ring of the planet carrier (9).

6. A hydraulic motor planetary reducer with forced cooling according to claim 5, characterized in that, The reducer also includes a reducer cover (10) and an elastic washer (11). The reducer cover (10) is placed on the outside of the planetary carrier (9), and the elastic washer (11) is placed on the housing of the hydraulic motor (3).

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