Electric cylinder with self-lubricating and heat dissipation functions
Patent Information
- Application Number
- CN202522148201.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-10-11
AI Technical Summary
[0003]现有技术中，电缸多采用 “单一部件散热” 或 “分散式散热” 设计：部分电缸仅针对缸体内部设置散热结构（如单根直线冷却管），未考虑驱动电机的同步散热需求，导致电机长期依赖自然风冷，在高转速运行时温度快速攀升，引发电机绕组绝缘老化、输出扭矩波动，进而影响电缸运动精度；另有部分电缸虽尝试同步散热，但采用独立的双散热系统（电缸侧水冷 + 电机侧风冷），需要两套独立管路与动力组件，不仅占用设备安装空间，还因管路接口增多导致冷却液泄漏风险提升，进一步降低散热效率，为此提出具有自润滑及散热功能的电缸来解决上述问题
1.本实用新型中，储液箱内壁的滤网可过滤冷却液杂质，避免螺旋管一、螺旋管二堵塞，保障循环通路通畅；液泵提供稳定动力，配合单向阀防止冷却液回流，确保冷却液单向稳定流经螺旋管一；环形套作为热量传导中介，将电缸主体与丝杆的热量传递至铜制螺旋管一，其螺旋设计增大接触面积，延长冷却液吸热路径，提升电缸侧散热效率；螺旋管二贴合驱动电机外壁且嵌装于外壳凹槽内，既缩短电机热量传递路径，又通过外壳固定避免移位，确保电机热量被充分吸收；最终冷却液经传输管二回流储液箱形成闭环，实现电缸与电机同步散热，有效避免两者因高温导致的运行精度下降与部件寿命缩短问题。
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Figure CN224733559U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric cylinder technology, and in particular to an electric cylinder with self-lubricating and heat dissipation functions. Background Technology
[0002] An electric cylinder, also known as an electric cylinder, is a modular actuator that converts the rotary motion of a servo motor into linear motion through a transmission mechanism such as a ball screw. Its core structure typically includes a servo motor, ball screw, cylinder barrel, piston rod, and control system. Its main function is to provide precise and stable linear drive force and displacement control for automated equipment. It can replace traditional hydraulic cylinders and pneumatic cylinders, and is widely used in industrial automated production lines, robot joint drives, new energy vehicle manufacturing, precision machining equipment, and other fields. It can achieve high-precision positioning (positioning accuracy up to 0.01mm), adjustable speed operation, and high thrust output. It also boasts advantages such as fast response speed, low operating noise, low maintenance costs, and strong environmental adaptability (no hydraulic oil / compressed air required, can be used in clean environments), meeting the high-precision and high-reliability requirements for linear motion control in automated scenarios.
[0003] In existing technologies, electric cylinders mostly adopt a "single-component heat dissipation" or "distributed heat dissipation" design: some electric cylinders only set up heat dissipation structures inside the cylinder body (such as a single straight cooling pipe), without considering the synchronous heat dissipation requirements of the drive motor. This results in the motor relying on natural air cooling for a long time, and the temperature rises rapidly when running at high speed, causing aging of the motor winding insulation and fluctuations in output torque, which in turn affects the movement accuracy of the electric cylinder; other electric cylinders attempt synchronous heat dissipation, but use independent dual heat dissipation systems (water cooling on the electric cylinder side + air cooling on the motor side), which requires two sets of independent pipelines and power components. This not only occupies equipment installation space, but also increases the risk of coolant leakage due to the increased number of pipeline interfaces, further reducing heat dissipation efficiency. Therefore, electric cylinders with self-lubricating and heat dissipation functions are proposed to solve the above problems. Utility Model Content
[0004] To overcome the above deficiencies, this utility model provides an electric cylinder with self-lubricating and heat dissipation functions, aiming to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: An electric cylinder with self-lubrication and heat dissipation functions includes an electric cylinder body, a lead screw passing through the electric cylinder body, the electric cylinder body being connected to a drive motor via a transmission device, a dual-circulation heat dissipation mechanism being provided between the electric cylinder body and the drive motor, and a self-lubricating mechanism for providing precise lubrication to the lead screw being provided inside the electric cylinder body. The heat dissipation mechanism includes an annular sleeve, the outer side of which is fixedly connected to the inner wall of the electric cylinder body. A spiral tube is inserted inside the annular sleeve. Both ends of the spiral tube protruding from the top of the electric cylinder body are fixedly connected to transmission tubes. A one-way valve is installed at the connection between the spiral tube and the two transmission tubes. A drive assembly for providing flow force to the coolant is provided at the input end of the left transmission tube. A spiral tube is fixedly connected to the output end of the right transmission tube. A transmission tube is fixedly connected to the output end of the spiral tube. As a further description of the above technical solution: The drive assembly includes a liquid storage tank, a liquid pump is installed on the top of the liquid storage tank, the liquid storage tank is detachably installed on the top of the electric cylinder body by bolts, the top of the liquid storage tank is provided with a liquid injection port with a rubber sealing cap, and the inner wall of the liquid storage tank is provided with a filter screen. As a further description of the above technical solution: The input end of the first transmission pipe is fixedly connected to the output end of the liquid pump, and the output end of the second transmission pipe is connected to the top right end of the liquid storage tank to form a closed-loop circulation path for the coolant. The outer wall of the lead screw is in contact with the inner wall of the annular sleeve. As a further description of the above technical solution: A sealing ring is fitted at the connection between the spiral tube and the two transmission tubes, and the bottom ends of the two sealing rings are fixedly connected to the top of the electric cylinder body. As a further description of the above technical solution: The drive motor is fitted with a housing, and the outer part of the spiral tube is fixedly installed inside the housing. The outer wall of the spiral tube is in contact with the outer wall of the drive motor. As a further description of the above technical solution: The self-lubricating mechanism includes an oil reservoir, which is fixedly installed on the top left side of the electric cylinder body. An oil supply ring is fixedly connected to the bottom of the oil reservoir. A connecting pipe is opened at the top of the oil supply ring, an annular pipe is opened inside the oil supply ring, and multiple oil supply holes are opened in the circumferential direction inside the oil supply ring. As a further description of the above technical solution: The top of the connecting pipe is connected to the interior of the oil storage tank, the bottom of the connecting pipe is connected to the annular pipe, and the side of the plurality of oil delivery holes away from the center of the oil delivery ring is connected to the annular pipe; As a further description of the above technical solution: The inner wall of the oil supply ring slides in contact with the outer wall of the lead screw, and the top of the oil storage tank is provided with an oil inlet with a threaded sealing cap.
[0006] This utility model has the following beneficial effects: 1. In this utility model, the filter screen on the inner wall of the liquid storage tank can filter impurities in the coolant, preventing blockage of the spiral tube 1 and spiral tube 2, and ensuring smooth circulation; the liquid pump provides stable power, and together with the one-way valve, prevents coolant backflow, ensuring that the coolant flows steadily in one direction through the spiral tube 1; the annular sleeve acts as a heat conduction medium, transferring the heat from the electric cylinder body and the lead screw to the copper spiral tube 1. Its spiral design increases the contact area, extends the heat absorption path of the coolant, and improves the heat dissipation efficiency on the electric cylinder side; the spiral tube 2 fits against the outer wall of the drive motor and is embedded in the groove of the outer shell, which shortens the heat transfer path of the motor and prevents displacement through the outer shell, ensuring that the heat of the motor is fully absorbed; finally, the coolant returns to the liquid storage tank through the transmission pipe 2 to form a closed loop, realizing synchronous heat dissipation of the electric cylinder and the motor, effectively avoiding the problems of decreased operating accuracy and shortened component life caused by high temperature.
[0007] 2. In this utility model, the oil storage tank is made of transparent material for easy observation of the oil level. The oil inlet with a threaded sealing cap prevents lubricating oil from evaporating and impurities from entering. The connecting pipe stably delivers lubricating oil to the oil delivery ring. The annular pipe inside the oil delivery ring evenly distributes lubricating oil along the circumference to avoid insufficient lubrication in certain areas. Multiple oil delivery holes are precisely aligned with the screw thread grooves, and the sliding contact between the oil delivery ring and the screw ensures stable oil injection position, allowing the lubricating oil to directly act on the transmission friction parts, forming a continuous lubrication film and significantly reducing frictional losses between the screw and transmission components. At the same time, this structure does not require frequent manual lubrication; it only needs to be replenished periodically through the oil inlet, greatly reducing the frequency of equipment maintenance and labor costs, and improving the stability of equipment operation. Attached Figure Description
[0008] Figure 1 This is a perspective view of the electric cylinder with self-lubricating and heat dissipation functions proposed in this utility model. Figure 2 This is a schematic diagram of the main body of the electric cylinder with self-lubrication and heat dissipation functions proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the annular sleeve of the electric cylinder with self-lubrication and heat dissipation functions proposed in this utility model. Figure 5 This is a schematic diagram of the oil supply ring of the electric cylinder with self-lubrication and heat dissipation functions proposed in this utility model.
[0009] Legend: 1. Electric cylinder body; 2. Transmission device; 3. Drive motor; 4. Annular sleeve; 5. Spiral tube one; 6. Lead screw; 7. Sealing ring; 8. Check valve; 9. Transmission pipe one; 10. Liquid storage tank; 11. Liquid pump; 12. Transmission pipe two; 13. Spiral tube two; 14. Outer shell; 15. Oil storage tank; 16. Oil delivery ring; 17. Connecting pipe; 18. Annular pipe; 19. Oil delivery hole. Detailed Implementation
[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0011] Reference Figure 2 , Figure 3 and Figure 4 The present invention provides an embodiment of an electric cylinder with self-lubrication and heat dissipation functions, comprising an electric cylinder body 1, which is a hollow cylindrical metal shell and serves as the basic support structure for the entire electric cylinder. A lead screw 6 is inserted inside the electric cylinder body 1. The lead screw 6 is a chrome-plated metal rod with threaded grooves on its surface. The electric cylinder body 1 is connected to a drive motor 3 via a transmission device 2. The transmission device 2 is a synchronous belt and synchronous pulley transmission structure, which provides a stable power connection for the synchronous operation of the electric cylinder and the motor. The drive motor 3 is a servo motor, and its output shaft is connected to the lead screw 6 via the transmission device 2. A double-circulation heat dissipation mechanism is provided between the electric cylinder body 1 and the drive motor 3. A self-lubricating mechanism for providing precise lubrication to the lead screw 6 is provided inside the electric cylinder body 1. The heat dissipation mechanism includes an annular sleeve 4, which is a hollow annular metal part. The annular sleeve 4 is fixedly connected to the inner wall of the electric cylinder body 1. A spiral tube 5 is inserted inside the annular sleeve 4. The spiral tube 5 is a hollow copper tube that extends spirally along the axial direction of the annular sleeve 4. The annular sleeve 4 provides positioning and fixation for the spiral tube 5, ensuring that the spiral tube is spirally arranged along the axial direction of the electric cylinder and increasing the contact area with the electric cylinder body 1. On the other hand, it serves as a heat conduction medium, transferring the heat from the electric cylinder body 1 and the lead screw 6 to the coolant inside the spiral tube 5, improving heat dissipation efficiency, and avoiding interference caused by direct contact between the spiral tube and the lead screw 6. Both ends of the spiral tube 15 protruding from the top of the electric cylinder body 1 are fixedly connected to the transmission tube 9. One-way valves 8 are installed at the connection between the spiral tube 15 and the two transmission tubes 9. The transmission tube 9 is a high-pressure resistant rubber tube. The one-way valve 8 prevents the coolant from flowing back due to pressure fluctuations and ensures that the coolant flows steadily in one direction. The input end of the left transmission tube 19 is provided with a drive component that provides flow force for the coolant. The output end of the right transmission tube 19 is fixedly connected to the spiral tube 2 13. The output end of the spiral tube 2 13 is fixedly connected to the transmission tube 2 12. The drive assembly includes a coolant reservoir 10, with a liquid pump 11 mounted on top of the reservoir 10. The liquid pump 11 provides power for the flow of coolant. The reservoir 10 is detachably mounted to the top of the electric cylinder body 1 by bolts. The top of the reservoir 10 has a filling port with a rubber sealing cap, and the inner wall of the reservoir 10 is equipped with a filter screen. The reservoir 10 is made of plastic or metal and structurally serves as a coolant storage container. The filling port facilitates the replenishment of coolant, and the rubber sealing cap prevents dust and impurities from entering. The filter screen can filter impurities in the coolant to avoid clogging the spiral tube 5 and the spiral tube 13. At the same time, it is connected to the transmission tube 12 to form a heat dissipation closed loop, ensuring the coolant is recycled and reused, thus reducing operating costs. The input end of transmission pipe 19 is fixedly connected to the output end of liquid pump 11, and the output end of transmission pipe 212 is connected to the top right end of liquid storage tank 10 to form a closed-loop circulation path for coolant. The outer wall of lead screw 6 is in contact with the inner wall of annular sleeve 4. A sealing ring 7 is fitted at the connection between the spiral tube 5 and the two transmission tubes 9. The bottom end of the two sealing rings 7 is fixedly connected to the top of the electric cylinder body 1. The sealing ring 7 is made of fluororubber, which seals both the connection gap between the spiral tube and the transmission tube and the installation gap between the transmission tube and the electric cylinder body 1. The drive motor 3 is fitted with a housing 14. The spiral tube 13 is fixedly installed inside the housing 14. The outer wall of the spiral tube 13 is in contact with the outer wall of the drive motor 3. The spiral tube 13 is a hollow copper tube that is spirally wound along the axis of the drive motor 3, so that the coolant can quickly absorb the heat of the motor. It is embedded in the groove of the inner wall of the housing 14 and the outer wall is in contact with the outer wall of the motor. The fixed housing 14 prevents the spiral tube from shifting, ensures stable heat dissipation of the motor, and prevents the motor from overloaded due to high temperature.
[0012] Reference Figure 1 , Figure 4 and Figure 5 The self-lubricating mechanism includes an oil reservoir 15, which is fixedly installed on the top left side of the electric cylinder body 1. The oil reservoir 15 is a transparent plastic or metal box, structurally serving as a storage container for lubricating oil. The transparent material facilitates observation of the oil level, and the threaded sealing cap prevents lubricating oil evaporation and avoids dust and impurities from entering and contaminating the lubricating oil. An oil delivery ring 16 is fixedly connected to the bottom of the oil reservoir 15, and the inner wall of the oil delivery ring 16 slides in contact with the outer wall of the lead screw 6. The top of the oil reservoir 15 has an oil inlet with a threaded sealing cap. A connecting pipe 17 is opened at the top of the oil delivery ring 16, and an annular pipe 18 is opened inside the oil delivery ring 16. Multiple oil delivery holes 19 are opened along the circumference inside the oil delivery ring 16. The top of the connecting pipe 17 communicates with the interior of the oil reservoir 15, and the bottom of the oil reservoir 15 is connected to the connecting pipe 17, providing a stable output path for the lubricating oil, ensuring a continuous supply of lubricating oil to the self-lubricating mechanism, and reducing manual labor. Maintenance frequency: The bottom of the connecting pipe 17 is connected to the annular pipe 18, and the side of the multiple oil delivery holes 19 away from the center of the oil delivery ring 16 is connected to the annular pipe 18. The oil delivery ring 16 is an annular metal part, coaxially sleeved on the outside of the lead screw 6. Structurally, it serves as a carrier for distributing lubricating oil. The annular pipe 18 and oil delivery holes 19 inside can accurately guide the lubricating oil to the thread groove of the lead screw 6. The sliding contact between the inner wall and the lead screw 6 ensures that the oil delivery holes 19 are always aligned with the thread groove, avoiding lubricating oil waste. At the same time, the metal material is wear-resistant and can be in contact with the lead screw 6 for a long time without damage, ensuring continuous lubrication. The annular pipe 18 is structurally a lubricating oil distribution chamber. After receiving the lubricating oil delivered by the connecting pipe 17, it is evenly distributed to the multiple oil delivery holes 19 along the circumference. The annular design ensures that the amount of oil in each oil delivery hole 19 is consistent, avoiding insufficient lubrication of the lead screw 6 in some areas. At the same time, the groove structure can temporarily store a small amount of lubricating oil to maintain the continuity of lubrication.
[0013] Working principle: When the electric cylinder starts running, the coolant in the reservoir 10 first passes through the filter screen inside the reservoir to filter impurities, and then is drawn by the pump 11 and transported to the left transmission pipe 9. Under the one-way conduction of the one-way valve 8, the coolant avoids backflow and enters the spiral tube 5 inside the annular sleeve 4 stably. Since the spiral tube 5 is spirally arranged along the axial direction of the annular sleeve 4 and the annular sleeve 4 is fixed to the inner wall of the electric cylinder body 1, the coolant can fully absorb the heat generated by the electric cylinder body 1 and the lead screw 6 transmission when flowing in the spiral tube 5. After completing the heat dissipation on the electric cylinder side, the coolant enters the spiral tube 13 outside the drive motor 3 through the right transmission pipe 9. Since the spiral tube 13 is fixed inside the housing 14 of the drive motor 3 and fits against the outer wall of the motor, the coolant further absorbs the heat generated by the operation of the drive motor 3. Finally, the coolant that has completed heat exchange flows back to the reservoir 10 through the transmission pipe 12, forming a closed loop circulation, continuously dissipating heat synchronously for the electric cylinder body 1 and the drive motor 3, and avoiding the impact of high temperature on the operating accuracy and life of both. The lubricating oil stored in the oil reservoir 15 flows naturally into the annular pipe 18 inside the oil supply ring 16 through the connecting pipe 17 at its bottom, which is connected to the oil supply ring 16. The annular pipe 18 is distributed around the circumference of the oil supply ring 16, which can evenly distribute the lubricating oil to multiple oil supply holes 19 on the inner wall of the oil supply ring 16. Since the oil supply ring 16 is coaxially sleeved on the outside of the lead screw 6 and its inner wall slides in contact with the outer wall of the lead screw 6, when the lead screw 6 rotates with the electric cylinder, the oil supply holes 19 will accurately deliver the lubricating oil to the thread groove of the lead screw 6, forming a continuous lubricating film and reducing the frictional wear between the lead screw 6 and the transmission components. The oil filling port with a threaded sealing cap on the top of the oil reservoir 15 can be opened to replenish the lubricating oil when it is insufficient, while preventing external dust and impurities from entering the oil tank and contaminating the lubricating oil, thus ensuring stable lubrication effect.
[0014] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An electric cylinder with self-lubricating and heat dissipation functions, comprising an electric cylinder body (1), characterized in that: The electric cylinder body (1) is equipped with a lead screw (6), the electric cylinder body (1) is connected to the drive motor (3) through the transmission device (2), a double-circulation heat dissipation mechanism is provided between the electric cylinder body (1) and the drive motor (3), and a self-lubricating mechanism for providing precise lubrication to the lead screw (6) is provided inside the electric cylinder body (1). The heat dissipation mechanism includes an annular sleeve (4), the outer side of which is fixedly connected to the inner wall of the electric cylinder body (1). A spiral tube (5) is inserted inside the annular sleeve (4). Both ends of the spiral tube (5) protruding from the top of the electric cylinder body (1) are fixedly connected to a transmission tube (9). A one-way valve (8) is installed at the connection between the spiral tube (5) and the two transmission tubes (9). A drive assembly for providing flow force to the coolant is provided at the input end of the left transmission tube (9). A spiral tube (13) is fixedly connected at the output end of the right transmission tube (9). A transmission tube (12) is fixedly connected at the output end of the spiral tube (13).
2. The electric cylinder with self-lubricating and heat dissipation functions according to claim 1, characterized in that: The drive assembly includes a liquid storage tank (10), a liquid pump (11) is installed on the top of the liquid storage tank (10), the liquid storage tank (10) is detachably installed on the top of the electric cylinder body (1) by bolts, the top of the liquid storage tank (10) is provided with a liquid injection port with a rubber sealing cap, and the inner wall of the liquid storage tank (10) is provided with a filter screen.
3. The electric cylinder with self-lubricating and heat dissipation functions according to claim 2, characterized in that: The input end of the first transmission pipe (9) is fixedly connected to the output end of the liquid pump (11), and the output end of the second transmission pipe (12) is connected to the top right end of the liquid storage tank (10) to form a closed-loop circulation path for the coolant. The outer wall of the lead screw (6) is in contact with the inner wall of the annular sleeve (4).
4. The electric cylinder with self-lubricating and heat dissipation functions according to claim 1, characterized in that: A sealing ring (7) is fitted at the connection between the spiral tube (5) and the two transmission tubes (9), and the bottom ends of the two sealing rings (7) are fixedly connected to the top of the electric cylinder body (1).
5. The electric cylinder with self-lubricating and heat dissipation functions according to claim 1, characterized in that: The drive motor (3) is fitted with a housing (14), and the spiral tube (13) is fixedly installed inside the housing (14). The outer wall of the spiral tube (13) is in contact with the outer wall of the drive motor (3).
6. The electric cylinder with self-lubricating and heat dissipation functions according to claim 5, characterized in that: The self-lubricating mechanism includes an oil reservoir (15), which is fixedly installed on the top left side of the electric cylinder body (1). An oil supply ring (16) is fixedly connected to the bottom of the oil reservoir (15). A connecting pipe (17) is opened on the top of the oil supply ring (16). An annular pipe (18) is opened inside the oil supply ring (16). Multiple oil supply holes (19) are opened inside the oil supply ring (16) along the circumferential direction.
7. The electric cylinder with self-lubricating and heat dissipation functions according to claim 6, characterized in that: The top of the connecting pipe (17) is connected to the interior of the oil storage tank (15), the bottom of the connecting pipe (17) is connected to the annular pipe (18), and the side of the plurality of oil delivery holes (19) away from the center of the oil delivery ring (16) is connected to the annular pipe (18).
8. The electric cylinder with self-lubricating and heat dissipation functions according to claim 6, characterized in that: The inner wall of the oil supply ring (16) slides in contact with the outer wall of the lead screw (6), and the top of the oil storage tank (15) is provided with an oil inlet with a threaded sealing cap.