Planetary reducer with low-speed-ratio transmission function

Abstract

The invention relates to the technical field of planetary reducers, in particular to a planetary reducer with small-speed-ratio transmission, which comprises an input shaft, a planet wheel, a shell, a planet carrier, a front flange and a rear flange, the front flange and the rear flange are respectively fixed at the front end and the rear end of the shell through bolts, and the input shaft is rotatably mounted on the rear flange; a sun gear is coaxially arranged at the front end of the input shaft, the rear end of the input shaft extends out of the rear flange, an inner gear ring is arranged in the shell, and the inner gear ring and the sun gear are coaxial; through the compression and circulation system, automatic compression and circulation cooling of lubricating oil are achieved, the lubricating oil in the shell is compressed through the compression assembly and conveyed out of the shell, then heat exchange is conducted through fins in the circulation assembly and a heat dissipation channel of the fins, heat is rapidly dissipated into air, active circulation cooling of the lubricating oil is achieved, and the service life of the lubricating oil is prolonged. The heat dissipation effect is greatly improved, and it is ensured that the speed reducer can still keep the low working temperature under the high-load and high-speed rotation working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of planetary reducers, in particular to a planetary reducer with a small speed ratio transmission. Background Art

[0002] The core working principle of the planetary reducer is to use a planetary gear system to complete the speed change between the input shaft and the output shaft; conventional planetary reducers usually adopt a multi-stage planetary gear system in series to reduce the speed of the output shaft and increase the torque of the output shaft; in the fields of small robots, precision instruments and medical auxiliary equipment, in order to meet the required transmission accuracy and reliability, planetary reducers with small speed ratio transmission have been derived. Planetary reducers with small speed ratio transmission usually adopt a single-stage planetary gear system and usually use precision gear meshing, so they can provide higher positioning progress than conventional planetary reducers. At the same time, the planetary gear system structure of a single machine makes its transmission loss smaller than that of a conventional planetary reducer, and the volume of the planetary reducer with a small speed ratio transmission is also smaller than that of a conventional planetary reducer.

[0003] However, it is worth noting that due to the small volume of the small-speed ratio planetary reducer, its heat dissipation surface is also reduced with the volume, which affects the heat dissipation of the small-speed ratio planetary reducer, and the internal structure of the small-speed ratio planetary reducer is relatively compact. As the running time of the small-speed ratio planetary reducer under high-speed and high-load working conditions increases, the temperature of the lubricating fluid inside it rises, and bubbles are easily generated, resulting in cavitation of the lubricating oil, reducing the lubrication effect, and easily causing poor lubrication of the planetary gear system, aggravating gear wear, and reducing the service life of the reducer.

[0004] In view of the above problems, the prior art provides some solutions, such as the invention patent with patent publication number CN117927649B, which provides a small-speed ratio planetary reducer with efficient heat dissipation and precise lubrication functions. The solution provided by the invention is: an automatic adjustment system composed of a thermal expansion sleeve and a movable rod is used. During operation, when the lubricating oil temperature is abnormal, the distance sensor can detect and feedback in real time. By adjusting the position of the movable rod, the coolant flow rate is quickly adjusted to ensure that the lubricating oil temperature remains within the optimal range. The coolant flow rate can be automatically adjusted according to the temperature change in the working chamber, thereby accurately controlling the lubricating oil temperature and ensuring stable transmission effect; however, the solution sets a sensor in the planetary reducer. During the operation of the planetary reducer, the internal lubricating oil is in a flowing state. The flowing lubricating oil is easy to impact the sensor, affecting the detection accuracy and service life of the sensor; and in the technical solution, the inner wall of the planetary reducer is provided with multiple annular holes and notch structures, which are not convenient for generation and processing. Summary of the invention

[0005] The purpose of the present invention is to provide a planetary reducer with a small speed ratio transmission, so as to solve the problem that the small volume setting of the planetary reducer with a small speed ratio transmission causes its heat dissipation surface to be reduced along with the volume, which easily leads to poor lubrication of the planetary gear system, aggravates gear wear, and reduces the service life of the reducer, while solving the problems existing in the existing solutions.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A planetary reducer with a small speed ratio transmission comprises an input shaft, a planetary gear, a housing, a planetary carrier, a front flange and a rear flange, wherein the front flange and the rear flange are respectively fixed to the front and rear ends of the housing by bolts, the input shaft is rotatably mounted on the rear flange, a sun gear is coaxially arranged at the front end of the input shaft, and the rear end of the input shaft extends to the outside of the rear flange, an inner gear ring is arranged in the housing, the inner gear ring is coaxial with the sun gear, there are at least three planetary gears, a plurality of the planetary gears are meshed with the sun gear and the inner gear ring, a plurality of the planetary gears are rotatably mounted on the planetary carrier, an output shaft is arranged at the front end of the planetary carrier, the output shaft is rotatably mounted with the front flange, and the front end of the output shaft extends to the outside of the front flange. A compression assembly and a circulation assembly are respectively provided on the inner and outer sides of the shell. The compression assembly is connected to the planetary carrier and is designed to transport the lubricating oil in the shell to the outside of the shell when the input shaft rotates. The circulation assembly is connected to the outer side wall of the shell and is designed to guide the lubricating oil transported by the compression assembly to the outside of the shell into the shell when the input shaft rotates.

[0008] When the input shaft starts to rotate, the mechanical structure in the compression assembly moves accordingly, exerting pressure on the lubricating oil in the housing and forcing it to flow to the outside of the housing. The circulation assembly is installed on the outer wall of the housing. Its design purpose is to receive the lubricating oil delivered from the compression assembly. After necessary cooling treatment, the cooled lubricating oil is reintroduced into the housing to form a closed-loop lubricating oil circulation system. Part of the lubricating oil is delivered to the outside of the housing for cooling treatment, which increases the heat dissipation surface area and improves the heat dissipation efficiency. This helps to reduce the operating temperature inside the reducer and prevent oil deterioration and thermal damage to mechanical parts caused by high temperature. Since the lubricating oil can circulate continuously and effectively inside and outside the housing, it ensures that the planetary gear system is always in a good lubrication state, thereby reducing the problem of gear wear caused by poor lubrication. This not only improves the smoothness and efficiency of the transmission, but also significantly extends the service life of the reducer.

[0009] Preferably, the compression assembly includes a mounting seat, a spring, a slider and a cylinder body, the mounting seat and the cylinder body are coaxially mounted in the housing, the mounting seat is bolted to the front end surface of the planet carrier, the cylinder body and the housing are installed by interference fit, a plurality of slideways are provided on the inner wall of the cylinder body, the plurality of slideways are arranged in a circular array along the axis of the cylinder body, the plurality of slideways are all arc-shaped surfaces, and are not coaxial with the cylinder body, the farthest distance between the slideway and the axis of the cylinder body is L1, the closest distance between the slideway and the axis of the cylinder body is L2, the maximum diameter of the cylinder body is D1, and the maximum diameter of the mounting seat is D2, D1>L1>L2=D2, a plurality of mounting grooves are provided on the outer wall of the mounting seat, the number of the mounting grooves is consistent with that of the slideway, and the plurality of mounting grooves are arranged in a circular array along the axis of the mounting seat, the spring is installed in the mounting groove, and the two ends of the spring are respectively connected to the slider and the mounting seat, the slider is slidably installed in the mounting groove, and one end of the slider extends out of the mounting groove, and the end of the slider extending out of the mounting seat is slidably connected to the slideway, and the cylinder body and the shell are both provided with oil inlets, and the two ends of the oil inlet are respectively connected to the inner side of the cylinder body and the outer side of the shell.

[0010] As the planetary reducer starts, the planet carrier starts to rotate, driving the mounting seat to rotate together. Since the mounting seat is coaxially installed with the cylinder body and relatively fixed, the rotation of the mounting seat will drive the reed and the slider to rotate together. As the speed increases, the slider begins to slide outward along the mounting groove under the action of centrifugal force, while its other end slides in the slideway. Since the slideway is arc-shaped and not coaxial with the cylinder body, the sliding of the slider in the slideway will further push it to move outward. As the slider moves, the change in the volume of its compression chamber causes the lubricating oil in the cylinder body to be compressed. At the same time, since the two ends of the oil inlet are respectively connected to the inner side of the cylinder body and the outer side of the shell, the compressed lubricating oil is pushed to the outside of the shell through the oil inlet under pressure. This design utilizes the rotational power of the planetary reducer to achieve automatic compression and delivery of the lubricating oil, ensuring sufficient lubrication of the internal components of the reducer. The lubricating oil pushed to the outside of the shell by the compression component enters the heat dissipation channel of the fin through the oil inlet. When the lubricating oil flows in the heat dissipation channel, it exchanges heat with the fins, transfers the heat to the fins and dissipates it into the air through the heat dissipation area of ​​the fins. As the lubricating oil flows, its temperature gradually decreases.

[0011] The cooled lubricating oil re-enters the housing through the oil outlet on the housing and continues to participate in the lubrication cycle. Through continuous cooling and circulation of the lubricating oil, the internal temperature of the reducer is kept stable, the overall stability and reliability of the system are improved, the aging and wear of components caused by high temperature are reduced, and the service life of the reducer is further extended. The rotational power of the planetary reducer is used to compress and transport the lubricating oil, without the need for an additional power source, which improves the overall efficiency of the system.

[0012] Preferably, the circulation component includes a heat dissipation shell and fins. The heat dissipation shell and the cylinder body are coaxial and installed outside the shell. The heat dissipation shell and the shell are interference fit. A plurality of fins are provided on the outer wall of the heat dissipation shell. The fins are heat dissipation channels. The plurality of heat dissipation channels are arranged in a circular array along the axis of the shell. The oil inlet is connected to the heat dissipation channel. A plurality of oil outlets are provided on the shell. The two ends of the oil outlets are respectively connected to the inner side of the shell and the heat dissipation channel.

[0013] Preferably, a front connecting channel and a rear connecting channel are provided in the fin, the front connecting channel is located on the front side of the fin, and the rear connecting channel is located on the rear side of the fin, and a single heat dissipation channel is connected to the heat dissipation channels on the adjacent two sides through the front connecting channel and the rear connecting channel respectively. If adjacent heat dissipation channels are not connected, the lubricating oil cannot flow and mix freely between the channels, and the flow and cooling of the lubricating oil in each channel will become relatively isolated. This may result in insufficient cooling of the lubricating oil in some areas, while other areas may be overcooled, thereby affecting the overall cooling efficiency. In contrast, the connected heat dissipation channels can balance the temperature through mutual mixing and redistribution of the oil flow, thereby improving the overall cooling uniformity and efficiency.

[0014] When the compression assembly compresses the lubricating oil in the housing and pushes it out of the housing, the lubricating oil first enters the heat dissipation channel in the fin through the oil inlet. Since the oil inlet is directly connected to the heat dissipation channel, the lubricating oil can be quickly dispersed into each heat dissipation channel.

[0015] Furthermore, in order to enhance the fluidity and cooling effect of the lubricating oil, a front connecting channel and a rear connecting channel are also provided in the fin. These two channels are located on the front and rear sides of the fin, respectively, and are used to connect adjacent heat dissipation channels. Through the design of the heat dissipation channel in the fin and the front connecting channel and the rear connecting channel, the lubricating oil can circulate in multiple channels, increasing the contact area and contact time with the fin, thereby improving the cooling efficiency. After the lubricating oil is initially cooled in a heat dissipation channel, it will flow to the next adjacent heat dissipation channel through the rear connecting channel to continue cooling. The lubricating oil flows along the channel wall in the heat dissipation channel and exchanges heat with the fin. The fin dissipates heat to the surrounding environment through its large heat dissipation surface, thereby reducing the temperature of the lubricating oil. At the same time, since the heat dissipation channels are arranged in a circular array along the axis of the shell, the lubricating oil can evenly cover the entire fin area during the flow process, ensuring the consistency of the cooling effect. The fully cooled lubricating oil finally re-enters the reducer housing through the oil outlet provided on the housing. The oil outlet is directly connected to the heat dissipation channel to ensure that the cooled lubricating oil can flow smoothly back to the lubrication system. The design of the circulation component realizes the closed-loop circulation of lubricating oil, reduces the consumption and waste of lubricating oil, and reduces the pollution to the environment. Through continuous and stable cooling and circulation of lubricating oil, the circulation component helps to maintain the stability and uniformity of the internal temperature of the reducer, and improves the operating stability and reliability of the entire system.

[0016] Preferably, a plurality of compression chambers are provided in the cylinder body, and a single compression chamber is composed of a single-channel slide, an outer side wall of a mounting seat, and a rear end face of a front flange. The volume of a single compression chamber is V1, and the content volume of the heat dissipation channel is V2. The ratio of the volume of the compression chamber to the content volume of the heat dissipation channel is in the range of 5≦V2 / V1≦8.

[0017] During the operation of the planetary reducer, as the planet carrier rotates, the compression assembly compresses the lubricating oil in the compression chamber by the interaction between the slideway and the slider. This compression process increases the pressure of the lubricating oil, and the compressed lubricating oil then enters the heat dissipation channel in the fin through the oil inlet for cooling. Since there is a certain proportional relationship in volume between the compression chamber and the heat dissipation channel, this design ensures that the lubricating oil can maintain an appropriate flow and pressure during the compression and cooling process, thereby achieving efficient lubrication and cooling effects.

[0018] By designing the volume ratio between the compression chamber and the heat dissipation channel, it is ensured that the lubricating oil can maintain appropriate flow and pressure during the compression and cooling process, which helps to achieve a more uniform and sufficient lubrication effect and reduce friction and wear between components. The heat dissipation channel has a larger internal volume and can accommodate more lubricating oil for cooling. By realizing the closed-loop circulation of lubricating oil, the consumption and waste of lubricating oil is reduced.

[0019] Preferably, a one-way valve is coaxially arranged in each of the plurality of oil inlets, and the passage direction of the one-way valve is from the inner side of the cylinder body to the inner side of the heat dissipation channel.

[0020] The passing direction of the one-way valve is set from the inside of the cylinder to the inside of the heat dissipation channel. This means that the lubricating oil can only flow from the inside of the cylinder to the heat dissipation channel, and cannot flow in the opposite direction. When the lubricating oil flows through the oil inlet, it must overcome the opening pressure of the one-way valve to enter the heat dissipation channel. Once in, the lubricating oil will flow in the heat dissipation channel, exchange heat with the channel wall or heat sink, thereby reducing the oil temperature. The lubricating oil after heat dissipation can return to the inside of the shell through the oil outlet to continue to participate in the circulation lubrication. Due to the presence of the one-way valve, these return oils will not flow back into the cylinder through the oil inlet, thereby ensuring the normal operation of the lubrication system.

[0021] The design of the one-way valve ensures that the lubricating oil can only flow in one direction, avoiding the mixing of hot oil and cold oil, helping to maintain the flow velocity and temperature gradient of the lubricating oil in the heat dissipation channel, so that the lubricating oil in the heat dissipation channel can exchange heat more effectively, thereby improving the heat dissipation efficiency. By ensuring the one-way flow of the lubricating oil, the one-way valve helps maintain the oil pressure and flow stability in the lubrication system, which allows the lubricating oil to be more evenly distributed in various parts of the planetary gear train, achieving a more adequate lubrication effect.

[0022] Preferably, a transition surface is provided between two adjacent slides, and the transition surface is a curved surface. When the planetary gear or other transmission components move between two adjacent slides, they will first contact the curved portion of the transition surface. Due to the design of the curved surface, these components can transition from one slide to another in a smoother manner. This smooth transition reduces the impact force and vibration caused by sudden changes in direction, making the transmission process more stable. The curved transition surface can disperse the contact stress, so that the planetary gear and other components are subjected to more uniform force during the transition process, which helps to reduce wear and damage caused by stress concentration. At the same time, the curved surface design can also reduce the heat and noise generated by friction, further improving the operating efficiency and service life of the reducer.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention realizes automatic compression and circulation cooling of lubricating oil through the compression and circulation system. The lubricating oil in the shell is compressed and transported to the outside of the shell through the compression component. Then, heat exchange is carried out through the fins and heat dissipation channels in the circulation component to quickly dissipate heat into the air, thereby realizing active circulation cooling of the lubricating oil, greatly improving the heat dissipation effect, and ensuring that the reducer can still maintain a low operating temperature under high load and high-speed rotation conditions.

[0025] 2. The planetary reducer of the present invention realizes the continuous and efficient circulation of lubricating oil inside and outside the housing through the circulation component design, greatly optimizes the lubrication effect, ensures that the planetary gear system maintains a good lubrication state for a long time, thereby significantly improving the transmission stability, efficiency and overall system stability, and effectively reducing the gear wear caused by poor lubrication and system instability caused by high temperature. This design not only extends the service life of the equipment, but also greatly reduces the cost expenditure caused by lubricating oil replacement and maintenance, improves the economy and reliability of the reducer, and brings significant cost reduction and efficiency improvement effects to industrial applications.

[0026] 3. The present invention does not require the introduction of an additional power source for heat dissipation. The heat dissipation system of the present invention innovatively utilizes the rotational power of the planetary reducer, and drives the compression component to work through the centrifugal force generated by the rotation of the planetary carrier, compressing the lubricating oil in the shell and pushing it out of the shell. This design not only simplifies the system structure and reduces manufacturing costs, but also avoids the energy loss and failure risks that may be caused by the introduction of an additional power source, thereby significantly improving the overall efficiency and reliability of the heat dissipation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the planetary reducer with small speed ratio transmission of the present invention;

[0028] Figure 2 It is a sectional view of the overall structure of the planetary reducer with small speed ratio transmission of the present invention;

[0029] Figure 3 A top view of a planetary reducer with a small speed ratio transmission according to the present invention;

[0030] Figure 4 for Figure 3 The cross-sectional view at BB in FIG.

[0031] Figure 5 for Figure 4 Enlarged view at D in the middle;

[0032] Figure 6 for Figure 3 Cross-sectional view at CC;

[0033] Figure 7 It is an exploded view of the planetary reducer with small speed ratio transmission of the present invention;

[0034] Figure 8 The figure is a schematic diagram of the overall structure of the heat dissipation housing in the planetary reducer with small speed ratio transmission of the present invention.

[0035] In the figure: 1. front flange; 2. mounting seat; 201. mounting groove; 3. housing; 301. inner ring gear; 3011. oil outlet; 4. heat dissipation housing; 401. fin; 402. heat dissipation channel; 403. front connecting channel; 404. rear connecting channel; 5. planetary carrier; 501. output shaft; 6. input shaft; 601. sun gear; 7. planetary gear; 8. rear flange; 9. reed; 10. slider; 11. cylinder body; 1101. oil inlet; 1102. slideway; 1103. compression chamber; 1104. transition surface; 12. one-way valve. DETAILED DESCRIPTION

[0036] See also Figures 1 to 8 The present invention provides a planetary reducer with a small speed ratio transmission, and the technical solution is as follows:

[0037] A planetary reducer with a small speed ratio transmission comprises an input shaft 6, planetary gears 7, a housing 3, a planetary carrier 5, a front flange 1 and a rear flange 8, wherein the front flange 1 and the rear flange 8 are respectively fixed to the front and rear ends of the housing 3 by bolts, the input shaft 6 is rotatably mounted on the rear flange 8, a sun gear 601 is coaxially arranged at the front end of the input shaft 6, and the rear end of the input shaft 6 extends to the outside of the rear flange 8, an inner gear ring 301 is arranged in the housing 3, the inner gear ring 301 is coaxial with the sun gear 601, three planetary gears 7 are all meshed and installed with the sun gear 601 and the inner gear ring 301, the planetary gears 7 are all rotatably mounted on the planetary carrier 5, an output shaft 501 is arranged at the front end of the planetary carrier 5, the output shaft 501 is rotatably mounted with the front flange 1, and the front end of the output shaft 501 extends to the outside of the front flange 1.

[0038] Specifically, a compression component and a circulation component are respectively provided on the inner and outer sides of the shell 3. The compression component is connected to the planetary carrier 5, and is designed to transport the lubricating oil in the shell 3 to the outside of the shell 3 when the input shaft 6 rotates. The circulation component is connected to the outer side wall of the shell 3, and is designed to guide the lubricating oil transported by the compression component to the outside of the shell 3 into the shell 3 when the input shaft 6 rotates.

[0039] See also Figure 2 , Figure 4 and Figure 5The compression assembly includes a mounting seat 2, a spring 9, a slider 10 and a cylinder body 11. The mounting seat 2 and the cylinder body 11 are coaxially mounted in the housing 3. The mounting seat 2 is connected to the front end surface of the planetary carrier 5 by bolts to ensure rotation with the planetary carrier 5. The cylinder body 11 is installed with an interference fit with the housing 3 to ensure sealing and stability. Three arc-shaped slideways 1102 are arranged on the inner wall of the cylinder body 11. The three slideways 1102 are arranged in a circular array along the axis of the cylinder body 11, and none of them are coaxial with the cylinder body 11. A transition surface 1104 is provided between two adjacent slideways 1102, and the transition surface 1104 is a curved surface. A plurality of mounting grooves 201 are provided on the outer wall of the mounting seat 2 corresponding to the position of the slideway 1102. The spring 9 is installed in the mounting groove 201, and the two ends of the spring 9 are respectively connected to the slider 10 and the mounting seat 2. When the input shaft 6 rotates, the planetary gear 7 and the planetary carrier 5 are driven to rotate through the sun gear 601. The rotation of the planet carrier 5 drives the mounting seat 2 and the cylinder body 11 connected thereto to rotate together. At this time, the slider 10 installed in the mounting groove 201 slides back and forth in the slideway 1102 under the action of the spring 9. Since the slideway 1102 is arc-shaped and not coaxial with the cylinder body 11, the reciprocating sliding of the slider 10 will form a plurality of compression chambers 1103 in the cylinder body 11, which are composed of a single-channel slideway 1102, the outer side wall of the mounting seat 2 and the rear end face of the front flange 1. As the planet carrier 5 rotates, the volume of these compression chambers 1103 will periodically decrease and increase, thereby achieving the compression and release of the lubricating oil in the housing 3. When the volume of the compression chamber 1103 decreases, the lubricating oil is compressed and transported to the outside of the housing 3 through the oil inlet 1101 opened on the cylinder body 11 and the housing 3. A one-way valve 12 is arranged in the oil inlet 1101 to ensure that the lubricating oil can only flow in one direction, that is, transported from the inside of the cylinder body 11 to the inside of the heat dissipation channel 402, thereby avoiding the backflow of the lubricating oil.

[0040] See also Figure 2 , Figure 6 and Figure 8 , the circulation component includes a heat dissipation shell 4 and fins 401. The heat dissipation shell 4 is coaxially installed with the cylinder body 11 outside the shell 3, and is tightly connected to the shell 3 through an interference fit to ensure sealing. A plurality of fins 401 are provided on the outer wall of the heat dissipation shell 4, and heat dissipation channels 402 are formed inside the fins 401. These channels are arranged in a circular array along the axis of the shell 3. The oil inlet 1101 is connected to the heat dissipation channel 402, so that the lubricating oil transported from the compression component to the outside of the shell 3 can enter the heat dissipation channel 402. At the same time, a plurality of oil outlets 3011 are provided on the shell 3, and the two ends of the oil outlet 3011 are respectively connected to the inner side of the shell 3 and the heat dissipation channel 402, forming a path for the lubricating oil to flow back.

[0041] See also Figure 2 and Figure 6After the lubricating oil enters the heat dissipation channel 402, it is rapidly cooled down by the heat dissipation of the fins 401. The front connecting channel 403 and the rear connecting channel 404 provided in the fins 401 enable a single heat dissipation channel 402 to be interconnected with the heat dissipation channels 402 on both sides thereof, forming a loop, thereby further improving the heat dissipation efficiency. As the lubricating oil circulates in the heat dissipation channel 402, its temperature gradually decreases and tends to be stable. Subsequently, the lubricating oil flows back into the housing 3 through the oil outlet 3011, and continues to provide lubrication for the various components of the planetary reducer.

[0042] Working principle:

[0043] See also Figures 1 to 8 When the input shaft 6 inputs torque, the sun gear 601 rotates along with the input shaft 6, and the sun gear 601 drives the planetary gear 7 to rotate. At this time, the planetary gear 7 revolves and rotates simultaneously under the meshing action of the sun gear 601 and the inner gear ring 301. The planetary gear 7 drives the planetary carrier 5 to rotate during operation, and the planetary carrier 5 drives the output shaft 501 to rotate, and outputs the decelerated torque through the output shaft 501; the planetary carrier 5 drives the mounting seat 2 to rotate during rotation, and the mounting seat 2 drives the slider 10 to rotate in the cylinder body 11 when rotating. The slider 10 maintains a sliding fit with the surface of the slideway 1102 under the elastic force of the spring leaf 9. The slider 10 compresses the lubricating oil entering the compression chamber 1103 during the rotation of the mounting seat 2. The lubricating oil in the compression chamber 1103 is compressed by the slider 10 and enters the cylinder body 111 through the oil inlet 1101. The lubricating oil enters the heat dissipation channel 402. Due to the action of the one-way valve 12, the lubricating oil entering the heat dissipation channel 402 can no longer enter the compression chamber 1103 through the oil inlet 1101. As the lubricating oil entering the heat dissipation channel 402 gradually increases, the heat dissipation channel 402 outside the oil inlet 1101 is filled with lubricating oil, and the overflowing lubricating oil enters the next heat dissipation channel 402 through the front connecting channel 403 or the rear connecting channel 404. During the process, the lubricating oil in the heat dissipation channel 402 dissipates heat to the air through the fins 401; until the lubricating oil flows to the heat dissipation channel 402 outside the oil outlet 3011, the cooled lubricating oil flows back to the housing 3 through the oil outlet 3011, and re-lubricates the sun gear 601, the planetary gears 7 and the inner ring 301, thereby completing a cooling cycle of the lubricating oil.

[0044] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A planetary reducer with a small speed ratio transmission, comprising an input shaft (6), a planetary gear (7), a housing (3), a planetary carrier (5), a front flange (1) and a rear flange (8), wherein the front flange (1) and the rear flange (8) are respectively fixed to the front and rear ends of the housing (3) by bolts, the input shaft (6) is rotatably mounted on the rear flange (8), the front end of the input shaft (6) is coaxially provided with a sun gear (601), and the rear end of the input shaft (6) extends to the outside of the rear flange (8), and the housing (3) is provided with an inner A gear ring (301), the inner gear ring (301) is coaxial with the sun gear (601), there are at least three planetary gears (7), the plurality of planetary gears (7) are meshed with the sun gear (601) and the inner gear ring (301), the plurality of planetary gears (7) are rotatably mounted on a planetary carrier (5), an output shaft (501) is provided at the front end of the planetary carrier (5), the output shaft (501) is rotatably mounted with the front flange (1), and the front end of the output shaft (501) extends outside the front flange (1), characterized in that: A compression assembly and a circulation assembly are respectively provided on the inner and outer sides of the housing (3); the compression assembly is connected to the planet carrier (5) and is designed so that when the input shaft (6) rotates, the compression assembly delivers lubricating oil in the housing (3) to the outside of the housing (3); the circulation assembly is connected to the outer side wall of the housing (3) and is designed so that when the input shaft (6) rotates, the circulation assembly guides the lubricating oil delivered by the compression assembly to the outside of the housing (3) into the housing (3).

2. A planetary reducer with small speed ratio transmission according to claim 1, characterized in that: The compression assembly comprises a mounting seat (2), a spring leaf (9), a slider (10) and a cylinder body (11). The mounting seat (2) and the cylinder body (11) are coaxially mounted in a housing (3). The mounting seat (2) is bolted to the front end surface of the planet carrier (5). The cylinder body (11) and the housing (3) are installed by interference fit. A plurality of slideways (1102) are arranged on the inner wall of the cylinder body (11). The plurality of slideways (1102) are arranged in a circular array along the axis of the cylinder body (11). The plurality of slideways (1102) are all arc-shaped surfaces and are not coaxial with the cylinder body (11). The farthest distance between the slideway (1102) and the axis of the cylinder body (11) is L1, and the shortest distance between the slideway (1102) and the axis of the cylinder body (11) is L2. The maximum diameter of the cylinder body (11) is D1, the maximum diameter of the mounting seat (2) is D2, and the D 1>L1>L2=D2, a plurality of mounting grooves (201) are provided on the outer wall of the mounting seat (2), the number of the mounting grooves (201) is the same as the number of the slideways (1102), and the plurality of mounting grooves (201) are arranged in a circular array along the axis of the mounting seat (2), the leaf spring (9) is installed in the mounting groove (201), and the two ends of the leaf spring (9) are respectively connected to the slider (10) and the mounting seat (2), the slider (10) is slidably installed in the mounting groove (201), and one end of the slider (10) extends outside the mounting groove (201), and the end of the slider (10) extending outside the mounting seat (2) is slidably connected to the slideway (1102), and the cylinder body (11) and the shell (3) are both provided with oil inlets (1101), and the two ends of the oil inlet (1101) are respectively connected to the inner side of the cylinder body (11) and the outer side of the shell (3).

3. A planetary reducer with small speed ratio transmission according to claim 2, characterized in that: The circulation component comprises a heat dissipation shell (4) and fins (401); the heat dissipation shell (4) and the cylinder body (11) are coaxial and installed outside the shell (3); the heat dissipation shell (4) and the shell (3) are in interference fit; a plurality of fins (401) are provided on the outer wall of the heat dissipation shell (4); a heat dissipation channel (402) is provided inside the fins (401); the plurality of heat dissipation channels (402) are arranged in a circular array along the axis of the shell (3); the oil inlet (1101) is connected to the heat dissipation channel (402); a plurality of oil outlets (3011) are provided on the shell (3); and two ends of the oil outlets (3011) are respectively connected to the inner side of the shell (3) and the heat dissipation channel (402).

4. A planetary reducer with small speed ratio transmission according to claim 3, characterized in that: The fin (401) is provided with a front connecting channel (403) and a rear connecting channel (404); the front connecting channel (403) is located at the front side of the fin (401), and the rear connecting channel (404) is located at the rear side of the fin (401); a single heat dissipation channel (402) is connected to the heat dissipation channels (402) on both sides thereof through the front connecting channel (403) and the rear connecting channel (404), respectively.

5. A planetary reducer with small speed ratio transmission according to claim 2, characterized in that: A plurality of compression chambers (1103) are provided in the cylinder body (11), wherein a single compression chamber (1103) is composed of a single-channel slideway (1102), an outer side wall of a mounting seat (2) and a rear end surface of a front flange (1), a volume of a single compression chamber (1103) is V1, an inner volume of the heat dissipation channel (402) is V2, and a ratio of the volume of the compression chamber (1103) to the inner volume of the heat dissipation channel (402) is in the range of 5≦V2 / V1≦8.

6. A planetary reducer with small speed ratio transmission according to claim 5, characterized in that: A one-way valve (12) is coaxially arranged in each of the plurality of oil inlets (1101), and the passage direction of the one-way valve (12) is from the inner side of the cylinder body (11) to the inner side of the heat dissipation channel (402).

7. A planetary reducer with small speed ratio transmission according to claim 2, characterized in that: A transition surface (1104) is provided between two adjacent slideways (1102), and the transition surface (1104) is a curved surface.

Images