Lead screw shaft self-lubricating system

Abstract

The utility model relates to the technical field of lead screw shaft lubrication, in particular to a lead screw shaft self-lubricating system. A lead screw shaft self-lubricating system comprises an oil feeding device, an oil feeding pipe, a lead screw shaft and a nut, an oil outlet of the oil feeding device is connected with one end of the oil feeding pipe, the other end of the oil feeding pipe is connected with the lead screw shaft, a sealing assembly is arranged on the end face of the lead screw shaft, and a main oil way is arranged in the lead screw shaft in the length direction of the lead screw shaft. A spiral lead screw shaft channel is arranged on the periphery of the lead screw shaft, a plurality of fine holes communicated with the lead screw shaft channel and the main oil way are arranged between the lead screw shaft channel and the main oil way, the lead screw shaft is sleeved with the nut, and the front end and the rear end of the nut are respectively provided with a sealing ring. Compared with the mode that an oil hole or a lubricating device is installed on a nut, the device body does not need to be disassembled and a lead screw assembly does not need to be found when lubricating liquid is supplemented, the difficulty of maintenance and disassembly and the time consumed by maintenance each time are reduced, and the residual state of the lubricating liquid of the device can be directly observed from the outside.

Description

Technical Field

[0001] This utility model relates to the field of lead screw lubrication technology, and in particular to a lead screw self-lubricating system. Background Technology

[0002] With the increasing level of industrial automation, the demands for precision, lifespan, and processing efficiency of automated equipment are also gradually rising. As a crucial component of industrial machine tools, the performance of the lead screw is closely related to the quality of lubrication. Currently, there are two methods for lubricating lead screw shafts: one involves machining oil injection holes on the lead screw nut, and some even install self-lubricating devices, extending the interval between maintenance and lubrication; the other involves manual lubrication from the outside or using the machine tool's own lubrication system to directly spray oil mist. The former is difficult to disassemble, especially for precision equipment or large machining equipment, where disassembly and assembly problems are more pronounced; the latter eliminates the need for disassembly, but the lubricant cannot enter the groove or is sprayed onto ineffective lubrication points, resulting in poor lubrication and increased lubricant consumption. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a lead screw self-lubricating system in order to solve the problems existing in the prior art in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a self-lubricating system for a lead screw shaft, including an oil delivery device, an oil delivery pipe, a lead screw shaft, and a lead screw nut. The oil outlet of the oil delivery device is connected to one end of the oil delivery pipe, and the other end of the oil delivery pipe is connected to the lead screw shaft. A sealing component is provided on the end face of the lead screw shaft. A main oil passage is provided inside the lead screw shaft along its length direction. A spiral lead screw shaft groove is provided on the outer circumference of the lead screw shaft. Multiple fine holes connecting the lead screw shaft groove and the main oil passage are opened. The lead screw nut is fitted on the lead screw shaft, and a sealing ring is provided at the front end and the rear end of the lead screw nut.

[0005] Furthermore, the sealing assembly includes a bearing, a bearing housing, a sealing gasket, a retaining ring, and an end cap. The end of the lead screw shaft connected to the oil supply pipe has a journal, on which a bearing is mounted. The bearing is mounted on the bearing housing. A retaining ring is mounted on the journal located on the inner end of the bearing. An end cap is connected to the outer end of the bearing housing. A sealing gasket is provided between the end cap and the bearing. A through hole is provided on the end cap, and the through hole is on the same straight line as the central axis of the oil supply pipe.

[0006] Furthermore, a ring edge extends from the inner wall of the end cap, and the end of the ring edge abuts against the sealing gasket to form a cavity.

[0007] Furthermore, the inner wall of the lead screw has a lead screw groove that matches the lead screw shaft groove.

[0008] Furthermore, it also includes a steel ball located between the lead screw groove and the lead screw shaft groove, with a first contact point and a second contact point formed between the steel ball and the lead screw groove, and a third contact point and a fourth contact point formed between the steel ball and the lead screw shaft groove.

[0009] Furthermore, the oil delivery device includes an oil storage tank and an oil pump. The oil pump is installed on the top of the oil storage tank, and the oil storage tank is connected to the input end of the oil pump. The top of the oil storage tank is provided with an oil outlet, and an oil outlet connector is installed on the oil outlet. One end of the oil outlet connector is connected to the output end of the oil pump, and the other end is connected to the oil delivery pipe.

[0010] Furthermore, a pressure gauge is also installed on the oil storage tank.

[0011] Furthermore, the top of the oil tank is provided with an oil filling port, and an oil filling cap is installed on the oil filling port.

[0012] Furthermore, a mounting plate is connected to one side of the top edge of the oil storage tank.

[0013] Furthermore, the oil outlet connector is a multi-head connector.

[0014] The beneficial effects of this utility model are:

[0015] Compared to installing oil holes or lubrication devices on the lead screw nut, this utility model eliminates the need to disassemble the equipment body and locate the lead screw assembly when replenishing lubricant, reducing the difficulty of maintenance disassembly and assembly and the time consumed for each maintenance. It also allows for direct observation of the remaining lubricant status from the outside.

[0016] This invention can lubricate multiple lead screws at once through multiple oil supply pipes, which has a more obvious advantage in multi-degree-of-freedom machining equipment that requires multiple lead screws and has a complex structure.

[0017] This invention arranges an oil passage inside the lead screw shaft, and the oil is discharged through the centrifugal force of its rotation. The oil can be directly introduced into the groove from inside the lead screw shaft, avoiding the problem that the lubricant cannot fully enter the lead screw shaft groove due to direct spraying of oil mist or lubricant.

[0018] The steel ball in this invention utilizes the four-point contact channel feature to lubricate the channel without affecting the contact between the steel ball and the channel, thus ensuring the accuracy of the lead screw.

[0019] This invention uses a lead screw shaft as the main lubricant, which can be adapted to various lead screw nuts and eliminates the need for frequent replacement of different types of grease fittings. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a front view of the oil delivery device in this utility model.

[0023] Figure 3 This is a side view of the oil delivery device in this utility model.

[0024] Figure 4 This is a top view of the oil delivery device in this utility model.

[0025] Figure 5 This is a schematic diagram of the sealing component in this utility model.

[0026] Figure 6 This is a schematic diagram of the lead screw shaft in this utility model.

[0027] Figure 7 yes Figure 6 Sectional view along the AA direction.

[0028] Figure 8 yes Figure 7 A magnified structural diagram at point B in the middle.

[0029] Figure 9 This is a partial cross-sectional view of the lead screw shaft and the lead screw nut in this utility model.

[0030] Figure 10 yes Figure 9 Assembly diagram of the steel ball.

[0031] In the diagram: 1. Oil supply device; 11. Oil reservoir; 12. Oil pump; 13. Oil outlet connector; 14. Pressure gauge; 15. Oil filler cap; 16. Mounting plate; 2. Oil supply pipe; 3. Lead screw shaft; 30. Journal; 31. Main oil passage; 32. Lead screw shaft groove; 33. Fine hole; 4. Nut; 41. Nut groove; 42. First contact point; 43. Second contact point; 43. Third contact point; 44. Fourth contact point; 5. Sealing assembly; 51. Bearing; 52. Bearing housing; 53. Sealing gasket; 54. Retaining ring; 55. End cap; 551. Ring edge; 6. Sealing ring; 7. Steel ball. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0033] like Figure 1As shown, a lead screw self-lubricating system includes an oil delivery device 1, an oil delivery pipe 2, a lead screw 3, and a lead screw nut 4. The oil outlet of the oil delivery device 1 is connected to one end of the oil delivery pipe 2, and the other end of the oil delivery pipe 2 is connected to the lead screw 3. A sealing component 5 is provided on the end face of the lead screw 3, and the lead screw nut 4 is fitted on the lead screw 3.

[0034] like Figures 2-4 As shown, the oil delivery device 1 includes an oil reservoir 11 and an oil pump 12. The oil reservoir stores lubricating oil, and the oil pump 12 is installed on top of the oil reservoir 11, with the oil reservoir 11 connected to the input end of the oil pump 12. An oil outlet is located on the top of the oil reservoir 11, and an oil outlet connector 13 is installed on the outlet. Lubricating oil can reach the outlet through the pressure applied by the oil pump 12. One end of the oil outlet connector 13 is connected to the output end of the oil pump 12, and the other end is connected to the oil delivery pipe 2. A pressure gauge 14 is also installed on the oil reservoir 11 to monitor the internal pressure and detect any abnormal pressure caused by common problems such as oil leakage or pipe blockage. An oil filling port is located on the top of the oil reservoir 11, and an oil filling cap 15 is installed on the port. Lubricating fluid can be added to the oil reservoir 11 after opening the oil filling cap 15. A mounting plate 16 is connected to one edge of the top of the oil reservoir 11, allowing the entire oil delivery device 1 to be mounted on the outside of the machine tool. In addition, the oil outlet connector is a multi-head connector, with multiple connectors connecting to multiple oil supply pipes 2, providing one-time lubrication for multiple lead screw shafts 3, which is especially suitable for multi-degree-of-freedom machining equipment that requires multiple lead screw shafts 3 and has a complex structure.

[0035] like Figure 5 As shown, the sealing assembly 5 includes a bearing 51, a bearing housing 52, a sealing gasket 53, a retaining ring 54, and an end cap 55. The end of the lead screw shaft 3 connected to the oil supply pipe 2 has a journal 30, on which the bearing 51 is mounted. The bearing 51 is mounted on the bearing housing 52, achieving normal fit between the bearing 51 and the journal 30. A retaining ring 54 is mounted on the journal 30 located on the inner end of the bearing 51. The outer end of the bearing housing 52 is connected to the end cap 55, and a sealing gasket 53 is provided between the end cap 55 and the bearing 51. The end cap 55 has a through hole, which is collinear with the central axis of the oil supply pipe 2, creating a sealed environment at the end face of the lead screw shaft 3 to ensure normal entry of lubricating fluid. A ring edge 551 extends from the inner wall of the end cap 55, with the end of the ring edge 551 tightly abutting against the sealing gasket 53 to form a cavity. After oil is supplied from the oil supply pipe 2, pressure is applied, allowing the lubricating fluid to enter the oil passage of the lead screw shaft 3.

[0036] like Figures 6-8As shown, the lead screw shaft 3 has a main oil passage 31 along its length inside, and a spiral lead screw shaft groove 32 on its outer circumference. Multiple fine holes 33 connect the lead screw shaft groove 32 and the main oil passage 31. The main oil passage 31 leads to the oil inlet end of the lead screw shaft 3, allowing lubricant to enter the main oil passage 31 from the oil inlet end. The other end of the main oil passage 3 is closed, allowing more pressure to be applied at the oil inlet, facilitating lubricant seepage. The lubricant seeps out from the main oil passage 31 into the fine holes 33. The lead screw shaft groove 32 moves in conjunction with the steel ball 7, and the lubricant seeps out, making its movement smooth. The spiral structure of the lead screw shaft groove 32 also serves a certain oil storage function.

[0037] like Figure 9 and Figure 10 As shown, a sealing ring 6 is provided at both the front and rear ends of the lead screw nut 4 to seal the internal space of the lead screw nut 4 and prevent dust particles from entering. A lead screw nut groove 41 is formed on the inner wall of the lead screw shaft groove 32, which mates with the lead screw shaft groove 32. The steel ball 7 is located between the lead screw nut groove 41 and the lead screw shaft groove 32, and the steel ball 7 will follow the lead screw nut 4 in a cyclical motion between the lead screw shaft groove 32 and the lead screw nut groove 41. A first contact point 42 and a second contact point 43 are formed between the steel ball 7 and the lead screw shaft groove 41, and a third contact point 43 and a fourth contact point 44 are formed between the steel ball 7 and the lead screw shaft groove 32. These four contact points cause the steel ball 7 to reciprocate. The fine hole 33 enters from the bottom of the lead screw shaft groove 32 without affecting the accuracy of the fit between the steel ball 7 and the two grooves.

[0038] The lead screw self-lubricating system of this embodiment uses the lead screw 3 as the lubrication body and employs an external pressurized oil injection lubrication method. This not only reduces a significant amount of maintenance and disassembly time but also allows for direct external observation of the remaining lubricant level. By arranging the oil passages inside the lead screw 3, the centrifugal force generated during its rotation allows oil to flow directly from inside the lead screw 3 into the lead screw groove 32. This avoids problems such as lubricant failing to enter the groove or lubricant being sprayed onto ineffective lubrication points, resulting in poor lubrication and excessive wasted lubricant. Utilizing the four-point contact groove characteristic, lubrication of the groove does not affect the contact between the steel ball 7 and the groove, ensuring the accuracy of the lead screw 3.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A self-lubricating system for a lead screw shaft, characterized in that: The device includes an oil delivery device (1), an oil delivery pipe (2), a lead screw shaft (3), and a lead screw nut (4). The oil outlet of the oil delivery device (1) is connected to one end of the oil delivery pipe (2), and the other end of the oil delivery pipe (2) is connected to the lead screw shaft (3). A sealing component (5) is provided on the end face of the lead screw shaft (3). A main oil passage (31) is provided inside the lead screw shaft (3) along its length direction. A spiral lead screw shaft groove (32) is provided on the outer circumference of the lead screw shaft (3). Multiple fine holes (33) connecting the lead screw shaft groove (32) and the main oil passage (31) are provided. The lead screw nut (4) is fitted on the lead screw shaft (3), and a sealing ring (6) is provided at the front end and the rear end of the lead screw nut (4).

2. The lead screw self-lubricating system according to claim 1, characterized in that: The sealing assembly (5) includes a bearing (51), a bearing housing (52), a sealing gasket (53), a retaining ring (54), and an end cap (55). The end of the lead screw shaft (3) connected to the oil supply pipe (2) has a journal (30). The bearing (51) is mounted on the journal (30). The bearing (51) is mounted on the bearing housing (52). A retaining ring (54) is mounted on the journal (30) located on the inner side of the bearing (51). An end cap (55) is connected to the outer side of the bearing housing (52). A sealing gasket (63) is provided between the end cap (55) and the bearing (51). A through hole is provided on the end cap (55). The through hole is on the same straight line as the central axis of the oil supply pipe (2).

3. The lead screw self-lubricating system according to claim 2, characterized in that: A ring edge (551) extends from the inner wall of the end cap (55), and the end of the ring edge (551) abuts against the sealing gasket (53) to form a cavity.

4. The lead screw self-lubricating system according to claim 1, characterized in that: The inner wall of the screw thread (4) is provided with a screw thread groove (41) that matches the screw shaft groove (32).

5. The lead screw self-lubricating system according to claim 4, characterized in that: It also includes a steel ball (7), which is located between the lead screw groove (41) and the lead screw shaft groove (32). A first contact point (42) and a second contact point (43) are formed between the steel ball (7) and the lead screw groove (41), and a third contact point (44) and a fourth contact point (45) are formed between the steel ball (7) and the lead screw shaft groove (32).

6. The lead screw self-lubricating system according to claim 1, characterized in that: The oil delivery device (1) includes an oil storage tank (11) and an oil pump (12). The oil pump (12) is installed on the top of the oil storage tank (11), and the oil storage tank (11) is connected to the input end of the oil pump (12). The top of the oil storage tank (11) is provided with an oil outlet, and an oil outlet connector (13) is installed on the oil outlet. One end of the oil outlet connector (13) is connected to the output end of the oil pump (12), and the other end is connected to the oil delivery pipe (2).

7. The lead screw self-lubricating system according to claim 6, characterized in that: A pressure gauge (14) is also installed on the oil storage tank (11).

8. The lead screw self-lubricating system according to claim 6, characterized in that: The top of the oil storage tank (11) is provided with an oil filling port, and an oil filling cap (15) is installed on the oil filling port.

9. The lead screw self-lubricating system according to claim 6, characterized in that: An mounting plate (16) is connected to one side of the top edge of the oil storage tank (11).

10. The lead screw self-lubricating system according to claim 6, characterized in that: The oil outlet connector (13) is a multi-head connector.

Images