Coaxial gearbox transmission rod assembly for height-adjustable table legs

Abstract

This invention discloses a coaxial gearbox transmission rod assembly for adjusting table legs, belonging to the technical field of transmission components. It includes a gearbox, an input rod, and an output rod. Both the input and output rods extend into the inside of the gearbox and are rotatably connected to it. A driving bevel gear is connected to one side of the input rod extending into the gearbox, and a gear disk is connected to one side of the output rod extending into the gearbox. A driven bevel gear is provided on the periphery of the gear disk. An oil supply wheel is located on the side of the driving bevel gear on the input rod. The oil supply wheel has an annular oil chamber inside, and several oil outlet pipes are arranged around the oil supply wheel facing the driving bevel gear. Several elastic pressing airbags are provided on the outer circumference of the oil supply wheel, and these airbags are connected to pressurization pipes. This invention can automatically supply lubricating oil when the gears are working inside the gearbox, ensuring timely lubrication of the gears and enabling the transmission rod assembly to transmit power and torque more effectively.

Description

Technical Field

[0001] This invention belongs to the technical field of gearbox transmission rod assemblies, specifically relating to a coaxial gearbox transmission rod assembly for raising and lowering table legs. Background Technology

[0002] Height-adjustable desks can meet the health-conscious office needs of people of different heights to alternate between standing and sitting. The lifting device of existing height-adjustable desks generally includes a drive mechanism, an input rod, two gearboxes, and two output rods. The output rods are connected to the input rods by gears in the gearboxes, and the output rods can rotate forward and backward under the drive of the gears. The surface of the output rods is provided with a threaded structure, which drives the relative displacement of the inner and outer tubes of the height-adjustable desk legs, thereby raising and lowering the desk legs.

[0003] Chinese patent application number 2018213893018 discloses a transmission rod assembly in the lifting device of a height-adjustable desk. In this design, the two transmission rods in the gearbox are driven by the meshing of two gears, thereby achieving the effect of rotating the transmission rods to lift the desk legs. Lubricating oil is typically added periodically to the gearbox to reduce friction between the gears. However, the working time of the gears in the gearbox used for lifting desk legs differs from gearboxes in other applications. After the height of the desk legs is adjusted, it often remains fixed for a long time until different users have different needs, at which point the height is readjusted. Therefore, the gears in the gearbox are in a non-working state for extended periods, and periodically adding lubricating oil would be wasteful. If no lubricating oil is added, the existing lubricating oil in the gearbox is easily contaminated by dust and moisture in the environment, reducing its lubrication effect. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a coaxial gearbox transmission rod assembly for raising and lowering table legs, comprising a gearbox, an input rod, and an output rod. Both the input rod and the output rod extend into the inside of the gearbox and are rotatably connected to it. The axial directions of the input rod and the output rod are perpendicular. A driving bevel gear is connected to one side of the input rod extending into the gearbox, and a gear disk is connected to one side of the output rod extending into the gearbox. A driven bevel tooth portion is provided on the periphery of the gear disk, and the driving bevel gear meshes with the driven bevel tooth portion. An oil supply wheel is provided on the input rod, located beside the driving bevel gear. An annular oil chamber is provided inside the oil supply wheel. A plurality of oil outlet pipes are arranged around the oil supply wheel facing the driving bevel gear. A plurality of elastic pressing airbags are provided on the outer circumference of the oil supply wheel. The elastic pressing airbags are connected to a pressurizing pipe, which is connected to the annular oil chamber and the oil outlet pipes. A pressing part is provided on the inner bottom of the gearbox, below the oil supply wheel.

[0005] Preferably, the pressing part includes a pressing roller and a support shaft, the support shaft is fixed at the bottom of the inner side of the gearbox below the oil supply wheel, and the pressing roller is rotatably mounted on the support shaft.

[0006] Preferably, the pressing part includes a fixing plate and a first magnetic plate. The fixing plate is fixed to the bottom of the inner side of the gearbox, located below the oil supply wheel. The first magnetic plate is fixed above the fixing plate. The elastic pressing airbag is provided with a second magnetic plate, and the second magnetic plate has the same magnetic poles as the first magnetic plate.

[0007] Preferably, the oil supply wheel is fixedly connected to the input rod. The oil supply wheel has a groove on the side facing the driving bevel gear. The inner wall of the groove has a plurality of first extrusion surfaces and a plurality of second extrusion surfaces. The first extrusion surfaces and the second extrusion surfaces are arranged adjacent to each other, and the angle between the first extrusion surfaces and the second extrusion surfaces is between 100° and 160°. A sleeve is connected in the middle of the driving bevel gear. A transmission disc is connected to the bottom of the sleeve. The driving bevel gear and the transmission disc are sleeved on the input rod through the sleeve. The transmission disc is embedded in the groove. The outer circumferential surface of the transmission disc has a plurality of extrusion plates that are bent in one direction. An elastic space is formed between one side of the extrusion plate and the outer circumferential surface of the transmission disc. The other side of the extrusion plate has an extrusion protrusion.

[0008] Preferably, a baffle is provided between the oil outlet pipe and the pressurizing pipe, and a return spring is connected to the side of the baffle near the pressurizing pipe. A piston is connected to the end of the return spring. A connecting groove is provided on the side of the baffle. When the return spring contracts, the pressurizing pipe communicates with the oil outlet pipe through the connecting groove. An oil supply groove hole is connected between the annular oil chamber and the pressurizing pipe.

[0009] Preferably, a cover plate is hinged to one end of the oil supply groove near the pressurization pipe, and the diameter of the cover plate is larger than the diameter of the oil supply groove.

[0010] Preferably, the annular oil cavity is provided with an elastic contraction airbag, the annular oil cavity is provided with an oil delivery hole on the inner side of the elastic contraction airbag, and the annular oil cavity is provided with an air pressure balance hole on the outer side of the elastic contraction airbag.

[0011] Preferably, the bottom of the output rod is provided with a threaded portion, the inside of the output rod is provided with a plurality of transmission tubes, the middle of the gear disk is provided with a plurality of first transmission ports, the first transmission ports are connected to one end of the transmission tubes, the threaded portion is provided with a plurality of second transmission ports, and the second transmission ports are connected to the other end of the transmission tubes.

[0012] Preferably, a plurality of anti-blocking discs are provided at intervals on the plurality of transmission pipes, the anti-blocking discs having a hollow structure inside, and the interior of the anti-blocking discs communicating with the plurality of transmission pipes.

[0013] Preferably, the outward-facing end of the oil outlet pipe is connected to a nozzle, and the nozzle is provided with several inclined spray holes.

[0014] The advantages of this invention are:

[0015] 1. This solution enables automatic on-demand lubrication. Lubricating oil is only dispensed from the oil outlet pipe onto the gear contact surface by pressing the elastic air chamber when the gears in the gearbox are engaged. When the gears are not in operation, the lubricating oil is not wasted. Furthermore, the relatively enclosed design of the annular oil chamber and oil outlet pipe reduces direct contact between the lubricating oil and the external environment, thereby lowering the risk of dust and moisture contamination and extending the service life of the lubricating oil.

[0016] 2. In this solution, by delaying the rotation of the driving bevel gear, the lubricating oil in the oil supply wheel can be evenly sprayed onto the contact surface before the driving bevel gear and the driven bevel gear rotate. This pre-lubrication method can significantly improve the lubrication effect of the gears, reduce friction and wear, and extend the gear life.

[0017] 3. This design, through the combination of a baffle, a return spring, and a piston, ensures an effective seal between the pressure pipe and the oil outlet pipe when no pressure is applied, preventing lubricating oil leakage. Simultaneously, it directly prevents the lubricating oil from coming into direct contact with the external environment, avoiding the possibility of lubricating oil contamination.

[0018] 4. This solution ensures that the lubricating oil can simultaneously cover the contact surface and threaded surface of the gear through the gear disc and transmission pipe, achieving comprehensive lubrication of key friction parts, which helps to reduce friction and wear, and improve the operating efficiency and life of the equipment.

[0019] 5. In this solution, anti-clogging discs are installed at intervals on the transmission pipe, thereby reducing the risk of insufficient local lubrication due to blockage to a certain extent. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a structural diagram of the internal structure of the gearbox of the present invention.

[0022] Figure 3 This is a cross-sectional structural diagram of the oil supply wheel disc of the present invention.

[0023] Figure 4 This is a structural diagram of the oil supply wheel and transmission disc of the present invention.

[0024] Figure 5 This is a side view of the nested structure of the oil supply wheel and transmission disc of the present invention.

[0025] Figure 6This is a structural diagram of the pressing part in Embodiment 3 of the present invention.

[0026] Figure 7 This is a cross-sectional view of the annular oil cavity below the oil supply wheel of the present invention.

[0027] Figure 8 This is a diagram showing the pressurized oil output state of the annular oil chamber below the oil supply wheel of the present invention.

[0028] Figure 9 The diagram shows the structure of the annular oil cavity of the present invention, which is provided with an elastic contraction airbag.

[0029] Figure 10 This is a structural diagram of the output rod of the present invention.

[0030] Figure 11 This is a structural diagram of the gear disk of the present invention.

[0031] Figure 12 This is a structural diagram of the transmission pipe and anti-clogging disc.

[0032] Figure 13 This is a diagram of the external structure of the nozzle of the present invention.

[0033] Figure 14 This is a cross-sectional structural diagram of the nozzle of the present invention.

[0034] In the diagram: 1 Gearbox, 2 Input rod, 3 Output rod, 4 Driving bevel gear, 5 Gear disk, 6 Driven bevel gear, 7 Oil supply wheel, 8 Annular oil chamber, 9 Oil outlet pipe, 10 Elastic pressing airbag, 11 Pressurizing pipe, 12 Pressing roller, 13 Support shaft, 14 Fixing plate, 15 First magnetic plate, 16 Second magnetic plate, 17 Groove, 18 First extrusion surface, 19 Second extrusion surface, 20 Sleeve, 21 Transmission disc, 22 Extrusion plate, 23 Elastic space, 24 Extrusion protrusion, 25 Baffle, 26 Return spring, 27 Piston, 28 Connecting groove, 29 Oil supply groove hole, 30 Cover plate, 31 Elastic contraction airbag, 32 Oil supply hole, 33 Air pressure balance hole, 34 Threaded part, 35 Transmission pipe, 36 First transmission port, 37 Second transmission port, 38 Anti-clogging disc, 39 Nozzle, 40 Spray hole. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped with" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In summary, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Example 1, such as Figure 1 As shown, a coaxial gearbox transmission rod assembly for raising and lowering table legs includes a gearbox 1, an input rod 2, and an output rod 3. A drive motor is connected to the middle portion of the input rod 2, which drives the input rod 2 to rotate. Typically, a gearbox 1 and an output rod 3 are provided on each side of the input rod 2 to achieve simultaneous raising and lowering of the table legs on both sides. Since the structures of the gearbox 1 and output rod 3 on both sides are identical, this embodiment only shows the gearbox 1 and output rod 3 on one side.

[0039] Combination Figure 2 In this embodiment, one side of the input rod 2 extends into the inner side of the gearbox 1 and is rotatably connected to the gearbox 1. The top of the output rod 3 extends into the inner side of the gearbox 1 and is also rotatably connected to the gearbox 1. The axial directions of the input rod 2 and the output rod 3 are perpendicular. The side of the input rod 2 extending into the gearbox 1 is connected to the driving bevel gear 4, and the side of the output rod 3 extending into the gearbox 1 is connected to the gear disk 5. The periphery of the gear disk 5 is provided with a driven bevel gear 6, and the driving bevel gear 4 meshes with the driven bevel gear 6. When the drive motor drives the input rod 2 to rotate, the input rod 2 drives the output rod 3 to rotate through the driving bevel gear 4. The lower outer surface of the output rod 3 is provided with a threaded part 34, thereby causing the inner and outer tubes of the lifting table leg to move relative to each other, thus raising and lowering the table leg.

[0040] Combination Figure 2-3 An oil supply wheel 7 is located on the side of the input rod 2, next to the driving bevel gear 4. The oil supply wheel 7 has an annular oil chamber 8 filled with lubricating oil. The oil supply wheel 7 rotates as the input rod 2 rotates. Several oil outlet pipes 9 are arranged around the oil supply wheel 7 facing the driving bevel gear 4. Several elastic pressing airbags 10 are located on the outer circumference of the oil supply wheel 7. Each elastic pressing airbag 10 is connected to a corresponding pressurizing pipe 11, which is connected to the annular oil chamber 8 and the corresponding oil outlet pipe 9. When the elastic pressing airbag 10 is pressed, the corresponding pressurizing pipe 11 pressurizes the annular oil chamber 8. Under the action of air pressure, the lubricating oil in the annular oil chamber 8 is sprayed out from the oil outlet pipe 9, thus entering the meshing part of the driving bevel gear 4 and the driven bevel gear 6. By precisely spraying the lubricating oil onto the gear contact surface, an effective oil film can be quickly formed upon restarting even if the gear has not been used for a long time, reducing friction and wear. This avoids the need for periodic lubrication and improves lubrication efficiency, ensuring the long-term stable operation of gearbox 1, input rod 2, and output rod 3.

[0041] A pressing part is provided on the inner bottom of the gearbox 1, below the oil supply wheel 7. After the pressing part is pressed, lubricating oil can quickly enter the meshing part between the driving bevel gear 4 and the driven bevel gear 6 from the oil outlet pipe 9 of the oil supply wheel 7. The oil supply wheel 7 and the driving bevel gear 4 rotate with the input rod 2. While the oil supply wheel 7 rotates, the elastic pressing airbag 10 on its outer circumference is pressed by the pressing part below, so that the lubricating oil in the annular oil chamber 8 is continuously sprayed from the oil outlet pipe 9 to the meshing part between the driving bevel gear 4 and the driven bevel gear 6. The elastic pressing airbag 10 is preferably made of thermoplastic polyurethane. This material can withstand large deformation and quickly return to its original shape after the external force is removed, making it very suitable for making elastic airbags that require frequent pressing and reset. At the same time, thermoplastic polyurethane also has good weather resistance and chemical corrosion resistance, and can maintain stable performance under various environmental conditions, which can further improve the pressing life. Besides thermoplastic polyurethane, silicone, rubber, and elastomer composites can all be used to manufacture the elastic compression airbag 10. To ensure the stability of the elastic compression airbag 10's reset, refer to... Figure 6 A spring can be added inside the elastic pressure airbag 10 to ensure that the elastic pressure airbag 10 quickly returns to its original position after being pressed and deformed.

[0042] Combination Figure 3In this embodiment, the pressing part includes a pressing roller 12 and a support shaft 13. The support shaft 13 is fixed to the bottom of the inner side of the gearbox 1, below the oil supply wheel 7. The pressing roller 12 is rotatably mounted on the support shaft 13. When the oil supply wheel 7 rotates, the elastic pressing airbags 10 on the outer circumference of the oil supply wheel 7 pass through the pressing roller 12 in sequence and are squeezed by the pressing roller 12. The support shaft 13 is fixed to the bottom of the gearbox 1, providing stable support for the pressing roller 12. This design makes it difficult for the pressing roller 12 to deviate or shake during rotation, thereby ensuring stable contact and effective squeezing with the elastic pressing airbags 10. Since the pressing roller 12 and the elastic pressing airbags 10 have a rolling friction structure, the friction between them is small. This not only reduces the wear on the elastic pressing airbags 10, but also, due to the smoothness of the rolling friction, the pressing roller 12 can squeeze the elastic pressing airbags 10 more effectively, thereby ensuring that the lubricating oil can be smoothly sprayed from the oil outlet pipe 9.

[0043] Combination Figure 4-5 In this embodiment, the oil supply wheel 7 is fixedly connected to the input rod 2. The oil supply wheel 7 has a groove 17 on the side facing the drive bevel gear 4. The inner sidewall of the groove 17 is provided with a plurality of first extrusion surfaces 18 and a plurality of second extrusion surfaces 19. The first extrusion surfaces 18 and the second extrusion surfaces 19 are arranged adjacent to each other and the angle between the first extrusion surfaces 18 and the second extrusion surfaces 19 is between 100° and 160°, and is 120° in this embodiment.

[0044] A sleeve 20 is connected in the middle of the driving bevel gear 4, and a transmission disc 21 is connected to the bottom of the sleeve 20. The driving bevel gear 4 and the transmission disc 21 are sleeved on the input rod 2 through the sleeve 20. The transmission disc 21 is embedded in the groove 17. The outer circumferential surface of the transmission disc 21 is provided with several extrusion plates 22 that are bent in one direction. An elastic space 23 is formed between one side of the extrusion plate 22 and the outer circumferential surface of the transmission disc 21. The other side of the extrusion plate 22 is provided with extrusion protrusions 24. Under normal conditions, such as Figure 5As shown, the extrusion protrusion 24 is located between the angles of the first extrusion surface 18 and the second extrusion surface 19. When the input rod 2 rotates, since the oil supply wheel 7 is fixedly connected to the input rod 2, the oil supply wheel 7 will immediately rotate accordingly. However, the driving bevel gear 4 and the transmission disc 21 are sleeved on the input rod 2 through the sleeve tube 20, so the driving bevel gear 4 and the transmission disc 21 are not directly driven by the input rod 2. The input rod 2 will first drive the oil supply wheel 7 to rotate. Taking clockwise rotation as an example, when the oil supply wheel 7 rotates clockwise, the first extrusion surface 18 will also move clockwise, and the first extrusion surface 18 will exert a clockwise force on the extrusion protrusion 24. At this time, since the driving bevel gear 4 is in a meshing state with the driven bevel tooth 6 on the gear disc 5, a certain force is required for the gear disc 5 to rotate. Therefore, in the initial stage, the driven bevel tooth 6 will actually play a certain limiting role on the driving bevel gear 4 and the transmission disc 21. When the first extrusion surface 18 initially moves clockwise, the extrusion protrusion 24 does not immediately move clockwise. Instead, under the pressure of the first extrusion surface 18, it causes the extrusion plate 22 to deform, bending towards the elastic space 23. This causes the extrusion protrusion 24 to slip on the first extrusion surface 18. However, when the extrusion plate 22 bends to its limit, its bottom abuts against the outer circumference of the transmission disk 21. At this point, since the extrusion plate 22 will no longer bend, the extrusion protrusion 24 will no longer slip against the first extrusion surface 18. The first extrusion surface 18 will then drive the transmission disk 21 to rotate clockwise via the extrusion protrusion 24, thereby driving the sleeve 20 and the drive bevel gear 4 to rotate clockwise. Therefore, the delayed rotation of the drive bevel gear 4 can be achieved through the aforementioned components. When the input rod 2 rotates, the oil supply wheel 7 rotates in advance relative to the driving bevel gear 4. Just before the driving bevel gear 4 and the driven bevel gear 6 rotate, lubricating oil can be sprayed from the oil outlet pipe 9 to the meshing parts of the driving bevel gear 4 and the driven bevel gear 6. Similarly, when the oil supply wheel 7 rotates counterclockwise, the second extrusion surface 19 can achieve a delayed rotation of the driving bevel gear 4 in the counterclockwise direction. After the oil supply wheel 7 rotates, the lubricating oil in the annular oil chamber 8 can be sprayed out before the driving bevel gear 4 rotates. This advance lubrication significantly improves the gear lubrication effect, preventing friction and wear between the driving bevel gear 4 and the driven bevel gear 6 due to a lack of lubricating oil in the initial stage, thus extending gear life. After the transmission disc 21 is embedded in the groove 17, an annular piece can be provided on the surface of the oil supply wheel 7, or the groove can be directly closed to achieve axial limiting of the transmission disc 21. If an annular piece is provided covering the surface of the oil supply wheel 7, through holes must be provided to ensure smooth spraying from the oil outlet pipe 9.

[0045] Example 2, this example has the same parts as Example 1, such as... Figure 7As shown, in this embodiment, the pressure pipe 11 is coaxially arranged with the oil outlet pipe 9. The cross-section of the pressure pipe 11 is L-shaped. A baffle 25 is provided between the oil outlet pipe 9 and the pressure pipe 11. A return spring 26 is connected to the side of the baffle 25 near the pressure pipe 11. A piston 27 is connected to the end of the return spring 26. A connecting groove 28 is provided on the upper side of the baffle 25. An oil supply groove hole 29 is connected between the annular oil chamber 8 and the pressure pipe 11. The pressure pipe 11, located below the oil supply wheel 7, is pre-filled with lubricating oil when the annular oil chamber 8 is replenished. Then, the lubricating oil in the annular oil chamber 8 is continuously replenished to the pressure pipe 11 below the oil supply wheel 7 under the action of gravity and centrifugal force. When the pressing part below squeezes the elastic pressing airbag 10, the lubricating oil in the pressure pipe 11 is pushed by the airflow from the elastic pressing airbag 10, impacting the piston 27 to the right, causing the return spring 26 to contract. Figure 8 As shown, when the return spring 26 contracts, the pressure pipe 11 can be connected to the oil outlet pipe 9 through the connecting groove 28, and the lubricating oil is supplied according to... Figure 8 The oil flows outward through the connecting groove 28 into the outlet pipe 9, as indicated by the middle arrow. When the elastic pressure bladder 10 is depressurized and resets, the return spring 26 and piston 27 also reset. Simultaneously, the lubricating oil in the annular oil chamber 8 flows into the pressurizing pipe 11 through the oil supply slot 29, awaiting the next pressurized injection. The combined design of the baffle 25, return spring 26, and piston 27 ensures an effective seal between the pressurizing pipe 11 and the outlet pipe 9 when not pressurized, preventing lubricating oil leakage and external contamination. During pressurization, the connecting groove 28 connects the two, ensuring smooth oil ejection.

[0046] Combination Figure 7-8 A cover plate 30 is hinged to one end of the oil supply slot 29 near the pressure pipe 11. The diameter of the cover plate 30 is larger than the diameter of the oil supply slot 29. When the pressure pipe 11 is propelled by airflow and the lubricating oil moves to the right, the cover plate 30 will seal the bottom of the oil supply slot 29 under the action of the lubricating oil flow, preventing the lubricating oil from flowing back into the annular oil chamber 8. When the elastic pressing airbag 10 is no longer pressurized and resets, the lubricating oil in the annular oil chamber 8 flows into the pressure pipe 11, and the cover plate 30 will automatically open, so as not to obstruct the flow of lubricating oil into the pressure pipe 11.

[0047] Combination Figure 9An elastic contraction air bladder 31 can also be provided inside the annular oil cavity 8. An oil inlet 32 ​​is provided inside the elastic contraction air bladder 31, and a pressure balance hole 33 is provided on the outer sidewall of the annular oil cavity 8. Lubricating oil is stored in the annular oil cavity 8 through the oil inlet 32. As more lubricating oil is injected, the elastic contraction air bladder 31 gradually expands. The pressure balance hole 33 connects the outside to the inside of the annular oil cavity 8, providing pressure balance and facilitating the expansion and contraction of the elastic contraction air bladder 31. After the lubricating oil fills the space inside the elastic contraction air bladder 31 in the annular oil cavity 8, the oil inlet 32 ​​is closed. Under the contraction of the elastic contraction air bladder 31, the lubricating oil in the annular oil cavity 8 is squeezed into the pressure pipe 11. Under the contraction of the elastic contraction air bladder 31, the lubricating oil is squeezed into the pressure pipe 11 at a stable speed and quantity, avoiding problems such as insufficient lubricating oil supply and reduced lubrication effect. The elastic contraction airbag 31 is made of a material with good elasticity, such as silicone, rubber, or thermoplastic polyurethane (TPU), and naturally tends to contract inward. When lubricating oil is injected into the annular oil chamber 8, the elastic contraction airbag 31 will expand and store a certain amount of elastic potential energy under the pressure of the oil. When the external oil injection stops or the lubricating oil in the annular oil chamber 8 is ejected through the oil outlet pipe 9, the pressure inside the annular oil chamber 8 decreases, and the elastic contraction airbag 31 automatically contracts due to its own elastic restoring force, thereby squeezing the lubricating oil in the annular oil chamber 8 into the pressure pipe 11, thus achieving a continuous supply of lubricating oil.

[0048] Example 3, this example has the same parts as Example 1, combined with Figure 6 The difference in this embodiment is that the pressing part includes a fixing plate 14 and a first magnetic plate 15. The fixing plate 14 is fixed to the bottom of the inner side of the gearbox 1, located below the oil supply wheel 7. The first magnetic plate 15 is fixed above the fixing plate 14. The elastic pressing airbag 10 is provided with a second magnetic plate 16, and the second magnetic plate 16 has the same magnetic pole as the first magnetic plate 15. In this embodiment, after the oil supply wheel 7 rotates, when the elastic pressing airbag 10 on its outer circumference passes the pressing part, the second magnetic plate 16 on the elastic pressing airbag 10 is successively subjected to the magnetic repulsion force generated by the first magnetic plate 15 on the fixing plate 14, thereby pressing the elastic pressing airbag 10. The elastic pressing airbag 10 does not need to contact the pressing part when pressed, thus avoiding the wear and friction that may occur in the traditional pressing method. This helps to maintain the integrity and sealing performance of the elastic pressing airbag 10, avoiding the problem of lubricating oil leakage due to sealing problems and the inability of pressing the elastic pressing airbag 10 to effectively promote the injection of lubricating oil.

[0049] Combination Figure 10-12In this embodiment, several transmission pipes 35 are provided inside the output rod 3, and several first transmission ports 36 are provided in the middle of the gear disk 5. The first transmission ports 36 are connected to one end of the transmission pipes 35. Several second transmission ports 37 are provided on the threaded part 34 below the output rod 3, and the second transmission ports 37 are connected to the other end of the transmission pipes 35. After the oil outlet pipe 9 sprays lubricating oil, part of the lubricating oil forms an oil film on the contact surface of the gear, and part of it flows to the first transmission ports 36. From the first transmission ports 36, it flows through the corresponding transmission pipes 35 to the second transmission ports 37, and finally flows to the surface of the threaded part 34, providing a lubricating effect to the surface of the threaded part 34. This solution ensures that the lubricating oil can simultaneously cover the contact surface of the gear and the surface of the threaded part 34, achieving comprehensive lubrication of key friction parts, which helps to reduce friction and wear, improve the operating efficiency and life of the equipment. At the same time, through the connection of the transmission pipes 35, the first transmission ports 36 and the second transmission ports 37, the lubricating oil can continuously flow from the oil outlet pipe 9 to the gear and the threaded part 34, ensuring the durability of the lubrication effect.

[0050] Several anti-blocking discs 38 are spaced apart on the transmission pipe 35. Each anti-blocking disc 38 has a hollow interior and is connected to the transmission pipes 35. When a transmission pipe 35 becomes blocked, the lubricating oil from the other transmission pipes 35 re-enters the blocked pipe 35 through the anti-blocking disc 38 below the blocked point. This allows the lubricating oil to flow to the second transmission port 37 corresponding to the blocked pipe 35, ensuring a continuous flow of lubricating oil to all parts requiring lubrication. This avoids situations where parts of the threaded portion 34 cannot be lubricated due to blockage. In this design, the anti-blocking disc 38 has a hollow cavity inside, and connecting holes corresponding to the transmission pipes 35 are opened on its upper and lower sides. Each transmission pipe 35 is divided into upper and lower sections by the anti-blocking disc 38, and the upper and lower sections are interconnected through the hollow cavity of the anti-blocking disc 38. In this way, when a certain transmission pipe 35 becomes blocked, the lubricating oil in the upper section of the other transmission pipes 35 can enter the hollow cavity of the anti-blocking disc 38 through the upper connecting hole. Part of the lubricating oil can directly enter the lower section of the corresponding transmission pipe 35 through the lower connecting hole, while the other part accumulates in the hollow cavity and then flows into the lower sections of other transmission pipes 35, including the blocked lower section. Through this reasonable design, flow diversion and compensation between transmission pipes 35 can be achieved, effectively avoiding lubrication problems caused by localized blockages. To ensure that an anti-blocking disc 38 is provided below any possible blockage location, this solution limits the spacing between the anti-blocking discs 38. The anti-blocking discs 38 are evenly arranged along the length of the transmission pipe 35, and the spacing between adjacent anti-blocking discs 38 is determined according to a multiple of the inner diameter D of the transmission pipe 35, preferably 3D to 6D. In this embodiment, the spacing is set to 4D. Experimental verification shows that when the spacing is greater than 6D, the lubricating oil flow downstream of the anti-blocking disc 38 will decrease under local blockage, easily forming a lubrication dead zone. However, when the spacing is controlled within the above range, the anti-blocking disc 38 can be guaranteed to be present below the blockage point regardless of its location on the transmission pipe 35, thus enabling the lubricating oil to smoothly cross the blockage point and continue to be transported. In this embodiment, when the upper section of a transmission pipe 35 is blocked, the lubricating oil in the upper section of the transmission pipe 35 cannot flow directly into the lower section. However, the lubricating oil in the upper sections of other transmission pipes 35 can still form a "transfer pool" through the hollow cavity of the anti-blocking disc 38, accumulating lubricating oil from other transmission pipes 35. The lubricating oil level in the hollow cavity rises and enters the lower end of the blocked transmission pipe 35. Under the action of gravity, the lubricating oil flows from the hollow cavity into the lower section of the blocked transmission pipe 35 through the pressure difference provided by gravity, realizing the flow of lubricating oil across the blockage point.

[0051] Combination Figure 13-14In this embodiment, a nozzle 39 is connected to the outward-facing end of the oil outlet pipe 9. The nozzle 39 has several inclined spray holes 40. The nozzle 39 is generally mushroom-shaped and can be screwed or fixedly connected to the oil outlet pipe 9. The multiple spray holes 40 on the nozzle 39 are all inclined, so that the lubricating oil can be more evenly distributed on the contact surface of the driving bevel gear 4 and the driven bevel gear 6 when sprayed out. This avoids the problem of uneven lubrication caused by the lubricating oil directly impacting the center of the gear disk 5. The inclined spray holes 40 allow the lubricating oil to cover the entire contact surface of the driving bevel gear 4 and the driven bevel gear 6 more quickly, improving the lubrication efficiency and ensuring that the gear can be lubricated in a timely manner when running at high speed.

[0052] Embodiments of the present invention have been shown and described. It will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coaxial gearbox transmission rod assembly for raising and lowering table legs, characterized in that: The device includes a gearbox (1), an input rod (2), and an output rod (3). Both the input rod (2) and the output rod (3) extend into the inside of the gearbox (1) and are rotatably connected to it. The axial directions of the input rod (2) and the output rod (3) are perpendicular. The input rod (2) is connected to a driving bevel gear (4) on one side extending into the gearbox (1), and the output rod (3) is connected to a gear disk (5) on one side extending into the gearbox (1). The peripheral part of the gear disk (5) is provided with a driven bevel gear (6). The driving bevel gear (4) Engaging with the driven bevel gear (6), the input rod (2) is provided with an oil supply wheel (7) located on the side of the driving bevel gear (4). The oil supply wheel (7) has an annular oil cavity (8) inside. The oil supply wheel (7) is surrounded by several oil outlet pipes (9) on the side facing the driving bevel gear (4). The outer circumference of the oil supply wheel (7) is provided with several elastic pressing airbags (10). The elastic pressing airbags (10) are connected to a pressurizing pipe (11). The pressurizing pipe (11) is connected to the annular oil cavity (8) and the oil outlet pipes (9). The gearbox (1) is located inside... A pressing part is provided on the bottom side below the oil supply wheel (7). The oil supply wheel (7) is fixedly connected to the input rod (2). A groove (17) is provided on the side of the oil supply wheel (7) facing the driving bevel gear (4). A plurality of first extrusion surfaces (18) and a plurality of second extrusion surfaces (19) are provided on the inner side wall of the groove (17). The first extrusion surfaces (18) and the second extrusion surfaces (19) are arranged adjacent to each other and the angle between the first extrusion surfaces (18) and the second extrusion surfaces (19) is between 100° and 160°. The driving bevel gear (4) The middle is connected by a sleeve (20), and the bottom of the sleeve (20) is connected to a transmission disc (21). The active bevel gear (4) and the transmission disc (21) are sleeved on the input rod (2) through the sleeve (20). The transmission disc (21) is embedded in the groove (17). The outer circumferential surface of the transmission disc (21) is provided with several extrusion plates (22) that are bent in one direction. One side of the extrusion plate (22) and the outer circumferential surface of the transmission disc (21) form an elastic space (23). The other side of the extrusion plate (22) is provided with extrusion protrusions (24).

2. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 1, characterized in that: The pressing part includes a pressing roller (12) and a support shaft (13). The support shaft (13) is fixed at the bottom of the inner side of the gearbox (1) below the oil supply wheel (7). The pressing roller (12) is rotatably mounted on the support shaft (13).

3. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 1, characterized in that: The pressing part includes a fixing plate (14) and a first magnetic plate (15). The fixing plate (14) is fixed to the bottom of the inner side of the gearbox (1) below the oil supply wheel (7). The first magnetic plate (15) is fixed above the fixing plate (14). The elastic pressing airbag (10) is provided with a second magnetic plate (16). The second magnetic plate (16) has the same magnetic pole as the first magnetic plate (15).

4. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 3, characterized in that: A baffle (25) is provided between the oil outlet pipe (9) and the pressurizing pipe (11). A return spring (26) is connected to the side of the baffle (25) near the pressurizing pipe (11). A piston (27) is connected to the end of the return spring (26). A connecting groove (28) is provided on the side of the baffle (25). When the return spring (26) contracts, the pressurizing pipe (11) is connected to the oil outlet pipe (9) through the connecting groove (28). An oil supply groove hole (29) is connected between the annular oil chamber (8) and the pressurizing pipe (11).

5. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 4, characterized in that: The oil supply slot (29) is hinged to a cover plate (30) at one end near the pressurization pipe (11), and the diameter of the cover plate (30) is larger than the diameter of the oil supply slot (29).

6. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 5, characterized in that: The annular oil cavity (8) is provided with an elastic contraction airbag (31), and the annular oil cavity (8) is provided with an oil delivery hole (32) on the inner side of the elastic contraction airbag (31), and the annular oil cavity (8) is provided with an air pressure balance hole (33) on the outer side of the elastic contraction airbag (31).

7. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 6, characterized in that: The bottom of the output rod (3) is provided with a threaded part (34), and the inside of the output rod (3) is provided with a plurality of transmission tubes (35). The middle of the gear disk (5) is provided with a plurality of first transmission ports (36). The first transmission ports (36) are connected to one end of the transmission tubes (35). The threaded part (34) is provided with a plurality of second transmission ports (37). The second transmission ports (37) are connected to the other end of the transmission tubes (35).

8. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 7, characterized in that: A plurality of anti-blocking discs (38) are provided at intervals on a plurality of the transmission pipes (35). The anti-blocking discs (38) have a hollow structure inside and are connected to the plurality of the transmission pipes (35).

9. The coaxial gearbox transmission rod assembly for raising and lowering table legs according to claim 8, characterized in that: The oil outlet pipe (9) is connected to a nozzle (39) at one end facing outwards. The nozzle (39) is provided with several inclined spray holes (40).

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