Planetary reduction gear cooling device

Abstract

The utility model relates to mechanical drive technical field discloses planetary reducer cooling device, including the cooling inner ring and cooling outer ring of the planetary reducer outside setting, the spiral cooling groove block is equipped with the outer wall of cooling inner ring, spiral cooling groove block and cooling outer ring inner wall form spiral cooling channel, the sealing of spiral cooling channel is carried out to O type sealing ring, cooling outer ring is equipped with the threaded hole of intercommunication channel, cooling inner ring still is equipped with the circular hole and annular groove for filling heat conduction gel, and planetary reducer cooling device solves the low heat dissipation efficiency, the problem of excessively high temperature rise of prior art. The utility model carries out direct, efficient forced circulation cooling to planetary reducer body, and improves heat conduction efficiency and insulates motor heat, reaches the beneficial effect of temperature control precision, guarantees the long -term stable operation of equipment.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a cooling device for planetary gear reducers. Background Technology

[0002] Planetary reducers, as a precision power transmission mechanism, are widely used in automation equipment, robots, and heavy machinery. Their main function is to reduce input speed and increase output torque. During the operation of a planetary reducer, the meshing transmission of the internal gear system and the friction of the bearings inevitably result in energy loss. Most of this lost energy is converted into heat, causing the temperature of the reducer body to rise.

[0003] With the increasing demands of modern industry on equipment performance, planetary gearboxes often need to operate under conditions of high load, high speed, or long-term continuous operation. This causes a sharp increase in internal heat generation. If the heat cannot be dissipated in a timely and effective manner, the continuous temperature rise will cause the viscosity of the lubricating oil to decrease, the lubrication performance to deteriorate, and the wear of gears and bearings to be aggravated. At the same time, the dimensional changes of various components due to thermal expansion and contraction will affect the transmission accuracy, ultimately shortening the overall service life of the gearbox and reducing the reliability of the system.

[0004] Currently, the heat dissipation of planetary gear reducers is usually achieved through passive cooling methods that rely on natural convection and radiation on the shell surface, or through forced air cooling by adding a fan. Passive cooling is only suitable for low-power, intermittent operation. For high-power applications, although forced air cooling provides some improvement, its heat dissipation efficiency is limited by the shell surface area and the air heat transfer coefficient. Heat needs to be conducted from the internal heat source to the outer surface of the shell to exchange with the air. The heat transfer path is long and the efficiency is limited. In addition, the motor driving the planetary gear reducer is also a major heat source. The heat generated will be directly conducted to the connected reducer, further aggravating the temperature rise of the reducer. Existing external cooling methods cannot effectively block this heat conduction.

[0005] Therefore, this utility model proposes a planetary gear reducer cooling device to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of low heat dissipation efficiency, inability to effectively isolate heat transfer from the motor leading to excessive temperature rise, and reduced operational reliability of existing planetary gear reducer cooling devices, this utility model aims to provide a planetary gear reducer cooling device with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a cooling device for a planetary gear reducer, including: a bracket, a planetary gear reducer; and a cooling inner ring, a cooling outer ring, and an O-ring seal.

[0008] The inner wall of the cooling inner ring is machined with an annular groove and the upper end face is provided with a circular hole communicating with the annular groove. The outer circular surface of the cooling inner ring is machined with a spiral cooling groove block and a mounting groove.

[0009] Furthermore, the planetary reducer is fixed on the bracket, the inner cooling ring is sleeved on the outer circular surface of the planetary reducer, the O-ring is installed in the mounting groove, the outer cooling ring is sleeved on the outer circular surface of the inner cooling ring, and two threaded holes are machined on the outer circular surface of the outer cooling ring, penetrating the ring wall and connecting the spiral cooling groove block. Finally, the planetary reducer, the inner cooling ring, and the outer cooling ring are fixed on the bracket together by screws.

[0010] Preferably, the spiral cooling trough block and the inner wall of the outer cooling ring together form a spiral cooling channel through which the cooling medium flows.

[0011] Preferably, the O-ring is pressed between the outer surface of the inner cooling ring and the inner wall of the outer cooling ring to seal the spiral cooling groove block.

[0012] Preferably, the inner wall of the cooling inner ring is precisely fitted with the planetary reducer, and thermally conductive gel is filled into the fitting gap between the two through the circular hole and the annular groove.

[0013] Preferably, the two threaded holes are arranged one above the other on the outer circular surface of the cooling outer ring along the axial direction of the planetary reducer, and respectively correspond to the starting end and the ending end of the spiral cooling groove block.

[0014] Preferably, the planetary reducer, the inner cooling ring, and the outer cooling ring are fixedly connected to the bracket by screws passing sequentially through the mounting through hole on the outer cooling ring and the inner cooling ring.

[0015] Preferably, the planetary reducer cooling device further includes a motor, the output shaft of which is connected to the input end of the planetary reducer.

[0016] Preferably, the planetary gear reducer cooling device further includes a water chiller, which is connected to the two threaded holes via an external pipeline.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problems of low heat dissipation efficiency and unstable operation caused by excessive temperature rise in planetary reducers in the prior art by setting up a cooling inner ring and a cooling outer ring that are closely fitted to the outer surface of the planetary reducer, and by using the spiral cooling groove block formed on the outer wall of the cooling inner ring after the two are fitted together to form a forced circulation water channel, thereby achieving the effect of direct, efficient and uniform cooling of the reducer body.

[0018] 2. This utility model, by setting round holes and annular grooves for filling thermally conductive gel in the inner cooling ring, forms a gapless thermally conductive layer between the cooling device and the planetary reducer, which solves the problem of low heat transfer efficiency caused by high contact thermal resistance between the heat sink and the heat source in the prior art, and achieves the beneficial effects of maximizing the heat transfer rate and effectively isolating the heat from the motor to the output end of the reducer. Attached Figure Description

[0019] Figure 1 This is a partial structural cross-sectional view of the planetary reducer cooling device proposed in this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view at point B in the middle; Figure 4 This is a partial structural schematic diagram of the planetary gear reducer cooling device proposed in this utility model.

[0020] Legend: 1. Motor; 2. Planetary reducer; 3. O-ring seal; 4. Cooling outer ring; 5. Cooling inner ring; 6. Bracket; 7. Mounting groove; 8. Spiral cooling groove block; 9. Round hole; 10. Annular groove; 11. Water chiller; 12. Threaded hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Example:

[0022] Please refer to Figures 1 to 4 This utility model provides a planetary reducer cooling device, which aims to solve the problem that the existing planetary reducer 2 lacks an efficient and direct integrated cooling structure, resulting in excessive temperature rise and unstable performance under high load.

[0023] like Figures 1 to 4As shown, the planetary reducer cooling device includes a bracket 6, which serves as the mounting base for the entire device. The planetary reducer 2 is fixedly connected to the bracket 6 by screws. The output end of the motor 1 is fixedly connected to the input end of the planetary reducer 2, providing power to the planetary reducer 2. The cooling inner ring 5 is fitted onto the outer circular surface of the planetary reducer 2, and the inner wall of the cooling inner ring 5 is precisely fitted with the outer circular surface of the planetary reducer 2. An annular groove 10 is machined on the inner wall of the cooling inner ring 5. At the same time, multiple circular holes 9 are machined on the upper end surface of the cooling inner ring 5, which are equidistantly distributed along the circumference. Each circular hole 9 is interconnected with the annular groove 10, used to fill the gap formed between the outer circular surface of the planetary reducer 2 and the inner wall of the cooling inner ring 5 from the outside with thermally conductive gel. On the outer circular surface of the cooling inner ring 5, a spiral cooling groove block 8 extending from top to bottom is machined, and a spiral cooling groove block 8 is located on the outer circular surface of the cooling inner ring 5. The mounting grooves 7 at the upper and lower ends of the cooling block 8, the cooling outer ring 4 fitted onto the outer circular surface of the cooling inner ring 5, cover the spiral cooling block 8, thus forming a spiral cooling channel. The O-ring seal 3 is installed in the mounting groove 7 and pressed between the cooling inner ring 5 and the cooling outer ring 4 to seal both ends of the spiral cooling channel and prevent leakage of the cooling medium. Two threaded holes 12 are machined on the outer circular surface of the cooling outer ring 4. The two threaded holes 12 are distributed one above the other along the axial direction of the planetary reducer 2 and both penetrate the ring wall of the cooling outer ring 4 and communicate with the spiral cooling channel to serve as the inlet and outlet of the cooling medium. The planetary reducer 2, the cooling inner ring 5 and the cooling outer ring 4 are finally fixed together on the bracket 6 by screws passing through the cooling outer ring 4 and the cooling inner ring 5 to form a stable overall structure. The external water chiller 11 is connected to the two threaded holes 12 through external pipelines.

[0024] Please refer to Figure 1 , Figure 2 and Figure 3The cooling outer ring 4 is a hollow circular ring structure. The inner wall of the cooling outer ring 4 is a smooth cylindrical surface, which is used to fit onto the outer circular surface of the cooling inner ring 5. On the outer circular surface of the cooling outer ring 4, two threaded holes 12 are machined one above the other along the axial direction of the planetary reducer 2. Both threaded holes 12 penetrate the ring wall of the cooling outer ring 4. In the assembled state, the cooling outer ring 4 is fitted over the cooling inner ring 5, which has a spiral cooling groove block 8. The smooth inner wall of the cooling outer ring 4 fits tightly against the outer edge of the spiral cooling groove block 8, thereby closing the open spiral cooling groove block 8 and forming a spiral cooling channel that runs from end to end. At the same time, to ensure the sealing of the spiral cooling channel, O-ring seals 3 are installed in the mounting grooves 7 located at the upper and lower ends of the spiral cooling groove block 8, respectively. When the cooling outer ring 4 is fitted... Once in place, the O-ring 3 is elastically compressed between the mounting groove 7 of the inner cooling ring 5 and the smooth inner wall of the outer cooling ring 4, forming a reliable axial seal. This effectively prevents the cooling medium from leaking from both ends of the channel under pressure. This structure, which is jointly enclosed by the external spiral channel of the inner cooling ring 5 and the inner wall of the outer cooling ring 4, and sealed at both ends by the O-ring 3, forms a complete and efficient forced convection heat exchange channel. This ensures that the cooling medium can flow fully along the preset spiral path, maximizing the removal of heat conducted by the planetary reducer 2 through the inner cooling ring 5. The upper threaded hole 12 serves as the inlet of the cooling medium, and the lower threaded hole 12 serves as the outlet of the cooling medium. After being connected to the external water chiller 11 through external pipelines, an active and recirculating cooling system can be established.

[0025] In a preferred embodiment, in order to minimize the contact thermal resistance between the planetary reducer 2 and the cooling inner ring 5 and improve the heat conduction efficiency, the inner wall of the cooling inner ring 5 and the outer circular surface of the planetary reducer 2 are precisely fitted. After the planetary reducer 2 and the cooling inner ring 5 are assembled, thermally conductive gel is injected into the inner ring 5 through the circular holes 9 that are equidistantly distributed along the upper end face of the cooling inner ring 5. Under the action of gravity and pressure, the thermally conductive gel is evenly distributed into the entire annular gap through the annular groove 10 that communicates with the circular holes 9, thereby completely filling the micro-unevenness and gaps that exist due to the limitation of machining precision, forming a flexible heat transfer layer with a high thermal conductivity without interruption, ensuring that the heat generated by the planetary reducer 2 during operation can be quickly and evenly conducted to the cooling inner ring 5.

[0026] As another preferred embodiment, in order to facilitate pipeline connection and optimize the flow and exhaust effect of the cooling medium, two threaded holes 12 are provided on the outer circular surface of the cooling outer ring 4, arranged one above the other along the axial direction of the planetary reducer 2. The upper threaded hole 12 corresponds to the starting end of the spiral cooling channel formed by the spiral cooling groove block 8, serving as the inlet of the cooling medium, and the lower threaded hole 12 corresponds to the ending end of the spiral cooling channel, serving as the outlet of the cooling medium. This layout allows the cooling medium to flow from top to bottom in the spiral cooling channel, which helps to smoothly discharge the air in the channel from the lower outlet during the initial filling, avoiding the formation of air resistance, ensuring that the entire channel is filled with liquid, thereby achieving the best heat exchange performance.

[0027] As another preferred embodiment, in order to ensure the structural stability and assembly accuracy of the entire cooling device, the fixed connection method of the planetary reducer 2, the inner cooling ring 5 and the outer cooling ring 4 is further defined. The outer cooling ring 4 has multiple mounting through holes. The screw passes through the mounting through holes of the outer cooling ring 4 and the corresponding through holes preset on the inner cooling ring 5 in sequence, and is finally screwed into the threaded hole 12 opened on the bracket 6. By tightening the screw, not only are the outer cooling ring 4 and the inner cooling ring 5 tightly fixed together, but the entire cooling assembly is also firmly installed on the bracket 6 as a whole, ensuring the vibration resistance and structural stability during equipment operation.

[0028] As a complete system application solution, the planetary reducer cooling device also includes a motor 1 that provides power and a water chiller 11 that provides cooling medium circulation. The output shaft of the motor 1 is fixedly connected to the input end of the planetary reducer 2 to form a transmission system. The water chiller 11 is connected to the threaded hole 12 above and below the cooling outer ring 4 through external pipelines to form a closed forced circulation cooling circuit.

[0029] Working principle: When motor 1 starts and drives planetary reducer 2 to work, the meshing motion of the gear system inside planetary reducer 2 will generate a lot of heat. At the same time, the heat generated by motor 1 itself will also be partially conducted to planetary reducer 2, causing the overall temperature of planetary reducer 2 to rise continuously. At this time, the external water chiller 11 starts and pumps the cooling medium into the threaded hole 12 above the cooling outer ring 4 through the external pipeline. The cooling medium then enters the spiral cooling channel formed by the spiral cooling groove block 8 of the cooling inner ring 5 and the inner wall of the cooling outer ring 4. Since the channel is spiral, the cooling medium flows in a long spiral manner in this channel, and fully performs forced convection heat exchange with the outer wall of the cooling inner ring 5. Meanwhile, the heat generated by the planetary reducer 2 is rapidly conducted from the outer surface of the planetary reducer 2 to the inner wall of the precisely fitted cooling inner ring 5 through the high-efficiency thermal conductive gel layer. The heat passes through the ring body of the cooling inner ring 5, reaches the outer wall, and is efficiently absorbed and carried away by the cooling medium flowing in the spiral cooling channel. The cooling medium, which has absorbed a large amount of heat, has an increased temperature and flows along the spiral cooling channel to the bottom, and finally flows out from the threaded hole 12 below the cooling outer ring 4. It then flows back to the water chiller 11 through the external pipeline. The water chiller 11 then cools down the high-temperature medium that flows back. The cooled medium is then pumped back into the threaded hole 12 above. This cycle repeats, forming a stable and continuous active heat dissipation circuit, which controls the operating temperature of the planetary reducer 2 within an ideal and constant range. Through this direct contact and forced circulation cooling method, the heat dissipation problem of the planetary reducer 2 itself is not only efficiently solved. Moreover, since the cooling device establishes a continuous low-temperature zone in the middle of the planetary reducer 2, it effectively absorbs the heat conducted from the front motor 1 and blocks the path of heat transfer to the output end of the planetary reducer 2, thereby achieving overall temperature control and ensuring the transmission accuracy, lubricating oil performance and long-term operational reliability of the planetary reducer 2.

Claims

1. A planetary reducer cooling device, comprising a bracket (6), a planetary reducer (2) fixed on the bracket (6), a cooling inner ring (5) sleeved on the outer circular surface of the planetary reducer (2), and a cooling outer ring (4) sleeved on the outer circular surface of the cooling inner ring (5). Its features are, The inner wall of the cooling inner ring (5) is machined with an annular groove (10), and the upper end face of the cooling inner ring (5) is provided with a plurality of circular holes (9) that are equidistantly distributed along the circumference and communicate with the annular groove (10). The outer circular surface of the cooling inner ring (5) is machined with a spiral cooling groove block (8) and a mounting groove (7), and the O-ring seal (3) is installed in the mounting groove (7); Two threaded holes (12) are machined on the outer circular surface of the cooling outer ring (4). The threaded holes (12) pass through the cooling outer ring (4) and connect to the spiral cooling groove block (8). The planetary reducer (2), the cooling inner ring (5) and the cooling outer ring (4) are fixed together on the bracket (6) by screws.

2. The planetary gear reducer cooling device according to claim 1, characterized in that, The spiral cooling trough block (8) and the inner wall of the cooling outer ring (4) together form a spiral cooling channel through which the cooling medium flows.

3. The planetary gear reducer cooling device according to claim 1, characterized in that, The O-ring (3) is pressed between the outer surface of the inner cooling ring (5) and the inner wall of the outer cooling ring (4) to seal both ends of the spiral cooling groove block (8).

4. The planetary gear reducer cooling device according to claim 1, characterized in that, The inner wall of the cooling inner ring (5) and the outer circular surface of the planetary reducer (2) are precisely fitted together, and the fitting gap formed by the precise fit is filled with thermally conductive gel through the circular hole (9) and the annular groove (10).

5. The planetary gear reducer cooling device according to claim 1, characterized in that, Two threaded holes (12) correspond to the starting and ending ends of the spiral cooling groove block (8) respectively, and are set on the outer circular surface of the cooling outer ring (4) along the axial direction of the planetary reducer (2).

6. The planetary gear reducer cooling device according to claim 1, characterized in that, The cooling outer ring (4) is provided with a mounting through hole. The screw passes through the mounting through hole and the cooling inner ring (5) in sequence to fix the cooling outer ring (4) and the cooling inner ring (5) on the bracket (6).

7. The planetary gear reducer cooling device according to claim 1, characterized in that, It also includes a motor (1), the output shaft of which is connected to the input end of the planetary reducer (2).

8. The planetary gear reducer cooling device according to claim 1, characterized in that, It also includes a water chiller (11), which is connected to two threaded holes (12) via external pipes.

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