Self-lubricating lead screw transmission mechanism

Abstract

The utility model relates to the technical field of lead screw transmission, and discloses a self-lubricating lead screw transmission mechanism which comprises a lead screw, a nut matched with the lead screw in a threaded mode and oil sealing rings arranged at the two ends of the nut respectively, wherein the inner ring walls of the oil sealing rings abut against the crest of the lead screw in an elastic mode. Oil scraping pieces are fixedly arranged on the sides, opposite to each other, of the two oil sealing rings at the two ends of the nut respectively, elastically abut against the tooth bottom of the lead screw and the tooth walls on the two sides of the lead screw and scrape off lubricating oil in the threaded groove along with rotation of the nut. According to the lead screw transmission mechanism, the lubricating oil in the threaded groove is scraped off through the oil scraping piece, the scraped lubricating oil is collected through the fixed-point oil discharging structure and discharged at a fixed point, the lubricating oil is collected through the oil collecting structure, and the lubricating oil is discharged through the fixed-point oil discharging structure. And mechanical equipment is prevented from being stained while the lubricating oil is repeatedly utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of screw transmission, in particular to a self-lubricating screw transmission mechanism. Background Art

[0002] Screw drives are common mechanical structures that convert rotational motion into linear motion, making them widely used in mechanical devices requiring linear motion. Screw drives consist of a lead screw and a nut that fits over the lead screw and engages with the lead screw's threads. Screw drives employ two transmission modes: one in which the nut rotates to drive the lead screw linearly, and the other in which the lead screw rotates to drive the nut linearly. To extend the lifespan of a screw drive, lubricant is typically added between the two components to reduce wear and tear, thereby extending their lifespan.

[0003] Chinese patent application number 202410325543.4 discloses a self-lubricating screw assembly comprising a screw and a nut mating with the screw; an oil reservoir and an oil scraper ring are disposed outwardly from the end of the nut; the oil scraper ring is sleeved around the screw and fits against its outer wall; the inner diameter of the oil reservoir is larger than the outer diameter of the screw. When the screw assembly is in use, grease is first added to the oil reservoir. As the screw and nut move relative to each other, the grease adheres to the screw and moves outward with it relative to the nut. When the grease reaches the oil scraper ring, it is scraped off and remains within the oil reservoir, thereby preventing a large amount of grease from being carried out.

[0004] However, the screw rod is a rod body with a thread groove on its outer surface, the outer surface of the screw rod is the screw rod tooth top, the bottom of the thread groove is the screw rod tooth bottom and the side wall of the thread groove is the screw rod tooth wall, the oil scraper ring is arranged on the outside of the screw rod and fits against the outer wall of the screw rod, that is, the oil scraper ring is arranged on the outside of the screw rod and fits against the screw rod tooth top. When the screw rod moves, it can only scrape off the lubricating oil on the screw rod tooth top, but cannot scrape off the lubricating oil in the screw rod thread groove. During the movement of the screw rod, the lubricating oil in the screw rod thread groove is carried away from the nut and drips onto the mechanical equipment, which not only wastes the lubricating oil but also dirtys the mechanical equipment. Utility Model Content

[0005] The utility model provides a self-lubricating screw transmission mechanism to address the shortcomings in the prior art that lubricating oil in the thread groove of the screw rod is carried away from the nut and drips onto the mechanical equipment during the movement of the screw rod, which not only wastes the lubricating oil but also soils the mechanical equipment.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A self-lubricating screw transmission mechanism includes a screw, a nut that cooperates with the screw thread, and oil sealing rings arranged at both ends of the nut, whose inner ring walls elastically abut against the screw thread tops. Oil scrapers are fixedly arranged on the opposite sides of the two oil sealing rings at both ends of the nut. The oil scrapers elastically abut against the screw thread bottom and the tooth walls on both sides and scrape the lubricating oil in the thread groove as the nut rotates. Fixed-point oil discharge structures are provided at both ends of the nut for collecting the lubricating oil scraped by the oil scrapers and discharging it at a fixed point.

[0008] With this solution, the oil seal ring prevents oil from escaping while also scraping off the oil on the screw's tops. The oil scraper scrapes off the oil from the screw's bottoms and walls, effectively scraping off the oil within the thread grooves, thereby ensuring that all excess oil on the screw is removed. The scraped oil is collected and discharged from a fixed-point oil drain mechanism. Because the oil is discharged at this fixed point, it doesn't drip everywhere as the screw moves, requiring only a fixed location for collection. Once collected, the oil won't drip onto mechanical equipment and contaminate it. Furthermore, it can be reused, eliminating any waste.

[0009] Preferably, a plurality of oil scraping blades are provided and distributed in a spiral array along the spiral direction of the thread groove.

[0010] With the above solution, multiple oil scraping blades are provided to increase the oil scraping capacity. The oil scraping blades are arranged along the spiral direction of the thread groove, ensuring that the oil scraping blades always move in the thread groove to scrape the oil when the nut rotates.

[0011] Preferably, adjacent oil scraping blades are elastically abutted against each other.

[0012] Preferably, the fixed-point oil drainage structure includes an oil drainage pipe sealed at both ends of the nut, into which the screw rod can be inserted. There is an oil-flow gap between the oil drainage pipe and the screw rod for the lubricating oil to pass through without touching the screw rod. Directly below the end of the oil drainage pipe away from the nut is the fixed oil drainage point for placing the oil collecting structure.

[0013] By adopting the above scheme, since the oil drain pipe is sleeved on the screw rod, the lubricating oil scraped from the thread groove of the screw rod by the oil scraper is blocked by the inner ring wall of the oil drain pipe and collected in the oil drain pipe. One end of the oil drain pipe is sealed with the nut. Therefore, the lubricating oil flows through the oil gap and is discharged in real time through the opening at the end of the oil drain pipe away from the nut, and will not accumulate in the oil drain pipe. At this time, it is only necessary to place the oil collecting structure at the fixed oil draining point, that is, the oil collecting structure is located directly below the opening at the end of the oil drain pipe away from the nut to smoothly receive the lubricating oil discharged from the oil drain pipe.

[0014] Preferably, the end of the oil drain pipe away from the nut is in a trumpet shape with an opening that gradually expands.

[0015] With the above solution, the gradually expanding trumpet-shaped opening facilitates the lubricating oil in the oil drain pipe to be smoothly discharged from the oil drain pipe under the action of gravity.

[0016] Preferably, an oil discharge port is provided on the side wall of the oil discharge pipe, and a plug that can be opened or closed is provided on the oil discharge port.

[0017] With the above solution, the oil drain port is blocked under normal conditions. When the nut and the oil drain pipe are rotated to the point where the oil drain port faces downward and stops rotating, an oil receiving device can be placed under the oil drain port, and the blockage can be opened manually to assist in draining the oil.

[0018] The utility model has significant technical effects due to the adoption of the above technical solutions: the oil sealing ring can prevent the lubricating oil from overflowing while scraping the lubricating oil on the top of the screw thread, and the oil scraper can scrape the lubricating oil in the thread groove. The scraped lubricating oil is blocked by the oil drain pipe and collected in the oil drain pipe. After flowing through the oil gap, it is discharged in real time through the opening at the end of the oil drain pipe away from the nut. Since the lubricating oil is discharged at a fixed point, it will not drip everywhere with the movement of the screw. It is only necessary to place an oil collecting structure at the fixed oil discharge point to receive it. After the lubricating oil is collected, it will not drip onto the mechanical equipment to dirty the mechanical equipment, and it can be reused without wasting the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a partial cross-sectional view of a self-lubricating screw transmission mechanism in Example 1;

[0020] Figure 2 yes Figure 1 A magnified view of point A in the figure;

[0021] Figure 3 This is a schematic diagram of the combination of several oil scrapers in a self-lubricating screw transmission mechanism in Example 1;

[0022] Figure 4 This is a partial schematic diagram of the cooperation between the screw and the oil scraper in a self-lubricating screw transmission mechanism in Example 1;

[0023] Figure 5 This is a partial cross-sectional view of a self-lubricating screw transmission mechanism in Example 2.

[0024] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Screw; 101. Thread top; 102. Thread bottom; 103. Thread wall; 2. Thread groove; 3. Nut; 4. Oil sealing ring; 5. Oil scraper; 6. Oil drain pipe; 7. Oil gap; 8. Oil collecting box; 9. Oil drain port; 10. Seal; 11. Drive wheel. DETAILED DESCRIPTION

[0025] The present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] A self-lubricating screw transmission mechanism, referring to Figures 1 to 4 , comprising a screw 1, a nut 3 threadedly engaged with the screw 1, and an oil sealing ring 4 whose inner ring wall is respectively arranged at both ends of the nut 3 and elastically abuts against the tooth top 101 of the screw 1. In this embodiment, the screw transmission mechanism is a ball screw pair, the nut 3 is rotatably connected to the device, and a guide structure is provided between the screw 1 and the device to drive the screw 1 to move linearly, thereby forming a transmission mode in which the nut 3 rotates to drive the screw 1 to move linearly. A driving wheel 11 is fixedly sleeved on the outer wall of the nut 3, and the nut 3 is driven to rotate by driving the driving wheel 11 to rotate, thereby driving the screw 1 to move linearly along its own axis. The internal structure of the ball screw pair, the rotational connection method between the nut 3 and the device, the guiding movement method between the screw 1 and the device, the driving method of the driving wheel 11, and the method of adding lubricating oil are all prior art, not shown in the figure, and will not be described in detail here.

[0028] Oil scrapers 5 are fixedly mounted on opposite sides of the nut 3 and the two oil seal rings 4 at both ends. The ends of these scrapers 5, facing away from the nut 3, are inserted into the thread groove 2 and elastically abut against the thread base 102 and the tooth walls 103 on either side of the screw rod 1. As the nut 3 rotates, the scrapers 5 scrape the lubricating oil from the thread groove 2. Several scrapers 5 are provided, distributed in a spiral array along the helical direction of the thread groove 2, with adjacent scrapers 5 elastically abutting against each other.

[0029] A fixed-point oil drain structure is located at each end of the nut 3, collecting the lubricating oil scraped by the oil scraper 5 and discharging it at a specific location. This structure includes a drain pipe 6, each sealed at either end of the nut 3. Both drain pipes 6 are sleeved around the outside of the screw rod 1, with a gap 7 between them allowing the lubricating oil to pass without contacting the rod. The fixed-point oil drain structure is located directly below the end of the drain pipe 6 facing away from the nut 3.

[0030] In this embodiment, the oil collection structure is an upward-opening oil collection box 8, which is placed directly below the opening of the oil drain pipe 6 away from the nut 3 and is used to receive the lubricating oil discharged from the oil drain pipe 6. In this embodiment, since the drive wheel 11 is fixedly mounted on one end of the nut 3, one oil drain pipe 6 is sealedly connected to the drive wheel 11, while the other oil drain pipe 6 away from the drive wheel 11 remains sealedly connected to the nut 3.

[0031] An oil drain port 9 is provided on the side wall of the oil drain pipe 6 so that the lubricating oil in the oil drain pipe 6 can flow out of the oil drain pipe 6 through the oil drain port 9. A plug 10 is provided on the oil drain port 9 which can be opened or closed.

[0032] The plug 10 blocks the oil drain port 9, and the oil collecting box 8 is placed directly below the opening of the oil drain pipe 6 at the end away from the nut 3. The nut 3 rotates, driving the oil sealing ring 4 and the oil scraper 5 to rotate. The oil sealing ring 4 prevents the lubricating oil from overflowing while scraping the lubricating oil on the top 101 of the screw rod 1. The oil scraper 5 scrapes the lubricating oil in the thread groove 2 of the screw rod 1. The scraped lubricating oil is blocked by the oil drain pipe 6 and collected in the oil drain pipe 6. After flowing through the oil gap 7, it is discharged in real time through the opening of the oil drain pipe 6 at the end away from the nut 3 and falls into the oil collecting box 8 for collection.

[0033] When the nut 3 and the oil drain pipe 6 rotate to the oil drain port 9 facing downward and stop rotating, another oil collecting box 8 can be placed under the oil drain port 9, and the plug 10 can be opened manually, and the oil drain port 9 can assist in draining the oil.

[0034] Example 2

[0035] Compared with Example 1, the difference in this embodiment is that Figure 5 The oil drain port 9 and plug 10 are removed, and the oil drain pipe 6 is shaped like a trumpet with its opening gradually widening from the end close to the nut 3 to the end away from the nut 3. Under the action of gravity, the lubricating oil can smoothly slide down the trumpet-shaped oil drain pipe 6 along the inclination angle, flow out from the opening at the end of the oil drain pipe 6 away from the nut 3, and fall into the oil collecting box 8 for collection.

[0036] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A self-lubricating screw transmission mechanism, comprising a screw (1), a nut (3) threadedly engaged with the screw (1), and an oil sealing ring (4) with inner ring walls respectively provided at both ends of the nut (3) elastically abutting against the tooth top (101) of the screw (1), characterized in that: Oil scrapers (5) are fixedly provided at both ends of the nut (3) on the side opposite to the two oil sealing rings (4). The oil scrapers (5) elastically abut against the tooth bottom (102) and the tooth walls (103) on both sides of the screw rod (1) and scrape off the lubricating oil in the thread groove (2) as the nut (3) rotates. Fixed-point oil discharge structures for collecting the lubricating oil scraped off by the oil scrapers (5) and discharging it at a fixed point are protruded at both ends of the nut (3).

2. The self-lubricating screw transmission mechanism according to claim 1, characterized in that: A plurality of oil scraping blades (5) are provided and distributed in a spiral array along the spiral direction of the thread groove (2).

3. The self-lubricating screw transmission mechanism according to claim 2, characterized in that: Adjacent oil scraping blades (5) are elastically abutted against each other.

4. The self-lubricating screw transmission mechanism according to claim 1, characterized in that: The fixed-point oil discharge structure comprises an oil discharge pipe (6) which is sealedly connected to both ends of the nut (3) and can be inserted into the screw rod (1). There is an oil gap (7) between the oil discharge pipe (6) and the screw rod (1) for the lubricating oil to pass through without the lubricating oil touching the screw rod (1). The fixed-point oil discharge point for placing the oil collecting structure is located directly below the end of the oil discharge pipe (6) away from the nut (3).

5. The self-lubricating screw transmission mechanism according to claim 4, characterized in that: One end of the oil drain pipe (6) away from the nut (3) is in a trumpet shape with an opening gradually expanding.

6. The self-lubricating screw transmission mechanism according to claim 4, characterized in that: An oil discharge port (9) is provided on the side wall of the oil discharge pipe (6), and a plug (10) which can be opened or closed is provided on the oil discharge port (9).

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