A smoothly operating external circulation type ball screw and its usage method

Abstract

A smoothly operating external circulation ball screw, comprising a screw rod and an upper nut located outside the screw rod. A through hole for installing the screw rod is opened on the inner side of the upper nut. A helically arranged rolling groove is opened on the inner side of the through hole. A number of pairwise corresponding installation holes are opened on the outer surface of the upper nut. A circulator is installed on the outer surface of the upper nut. The circulator is provided with a connecting portion inserted into the installation hole. A circulation channel is opened on the inner side of the circulator, passing through the connecting portion and connecting with the rolling groove. The included angle between the installation hole and the rolling groove is an obtuse angle. The connection part between the circulation channel and the rolling groove is lower than the rolling groove. The rolling groove on the inner side of the upper nut and the installation hole form an obtuse angle and the circulation channel is lower than the rolling groove, so that the balls can enter and exit the circulator along the ramp channel formed by the installation hole and the rolling groove, thus avoiding the collision of the balls with the circulator or the rolling groove when the balls roll, ensuring smooth rolling of the balls, with less damage to the balls, and at the same time, the vibration amplitude of the device during use is small.

Description

Technical Field

[0001] The present invention relates to linear transmission elements, and particularly to an outer circulation type ball screw with smooth operation and its usage method. Background Art

[0002] Patent Application No. CN201320758087.X discloses an outer circulation type ball screw, comprising: a screw rod, which is in a long strip structure, and a spiral rolling groove is arranged on the outer surface of the screw rod; a nut, which is provided with a perforation for the screw rod to pass through, and a rolling groove opposite to the rolling groove is arranged on the inner edge surface of the perforation. The rolling groove and the rolling groove form a load path. A plane is arranged on the outer surface of the nut, and at least two mounting holes are arranged on the plane; at least one circulation element, which is in an inverted U-shaped structure. The two inverted U-shaped ends of the circulation element are respectively inserted into the mounting holes, and the circulation element has a recessed dismounting groove relative to the plane. Referring to the attached Figure 14 As shown, a support surface for supporting the circulation element is arranged in the mounting hole of this application. However, there will definitely be an installation error between the mounting hole and the circulation element, so that the circulation element protrudes on the rolling groove of the nut or the rolling groove protrudes on the circulation element, resulting in the balls hitting the protruding rolling groove or the protruding circulation element when flowing into or out of the semi-return channel, which may cause damage to the balls and make the device vibrate more frequently during use. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the above prior art, and provides an outer circulation type ball screw with smooth operation. The device has a reasonable structural design, is convenient to use. The angle between the mounting hole and the rolling groove is set as an obtuse angle, and the circulation channel is lower than the rolling groove, so that when the balls enter and exit the circulator, they all enter and exit the circulator through an inclined slope, thus avoiding the balls running more smoothly, prolonging the service life of the balls, and reducing the vibration of the screw rod.

[0004] The technical solution adopted by the present invention to solve its technical problems: Such a smoothly operating external circulation type ball screw includes a screw rod and an upper nut located outside the screw rod. A through hole for installing the screw rod is opened inside the upper nut. A helically arranged rolling groove is opened inside the through hole. A number of pairwise corresponding installation holes are opened on the outer surface of the upper nut. A circulator is installed on the outer surface of the upper nut. The circulator is provided with a connecting portion inserted into the installation hole. A circulation channel is opened inside the circulator, which penetrates through the connecting portion and is connected to the rolling groove. The included angle between the installation hole and the rolling groove is β, and β is an obtuse angle. The connection part between the circulation channel and the rolling groove is lower than the rolling groove. The rolling groove inside the upper nut and the installation hole form an obtuse angle and the circulation channel is lower than the rolling groove, so that the balls can enter and exit the circulator along the ramp channel formed by the installation hole and the rolling groove, thereby avoiding the collision of the balls with the circulator or the rolling groove when the balls roll, ensuring smooth rolling of the balls, causing less damage to the balls, and at the same time, the vibration amplitude of the device during use is small.

[0005] For further improvement, a second installation platform is opened at the lower end of the upper nut. Lubricating oil circulation holes are opened inside the left and right ends of the second installation platform. The left and right lubricating oil circulation holes are respectively connected to the rolling grooves on the left and right sides of the installation hole. A fuel storage device is fixedly connected to the lower end of the second installation platform. The upper left and right sides of the fuel storage device are provided with collecting portions clamped inside the lubricating oil circulation holes. The fuel storage device includes a sealing plate lubricating oil circulation hole and an upper oil scraping portion lubricating oil circulation hole located inside the left and right two lubricating oil circulation holes. The upper sides of the left and right ends of the sealing plate lubricating oil circulation hole are provided with lower oil scraping portion lubricating oil circulation holes that are spliced with the upper oil scraping portion lubricating oil circulation hole. The collecting portion is formed by the splicing of the upper oil scraping portion lubricating oil circulation hole and the lower oil scraping portion lubricating oil circulation hole. An oil delivery channel is opened inside the collecting portion, and the oil delivery channel is connected to the tangential direction of the rolling groove. A storage channel connecting the left and right oil delivery channels is opened inside the second installation platform. A protruding portion located in the thread groove is provided on the upper side of the upper oil scraping portion lubricating oil circulation hole. A fuel storage device is provided at the lower end of the lower nut. The collecting portions at the left and right ends of the fuel storage device are located on the left and right sides of the ball circulation channel inside the upper nut. Thus, when the upper nut moves left and right, the lubricating oil on the screw rod that moves out of the upper nut is removed and collected through the collecting portion. The collected lubricating oil then flows out through the oil delivery channel on the other side to the outside of the screw rod that the upper nut is about to pass through, thereby avoiding the lubricating oil on the screw rod after moving out of the upper nut being affected by the external processing environment, resulting in the normal operation of the screw rod, and at the same time avoiding the need to lubricate the entire screw rod, reducing the loss of lubricating oil, and greatly prolonging the lubrication time of the device.

[0006] Further improvement: A support groove is formed on the second installation platform outside the lubricating oil circulation hole. A limiting portion located inside the support groove is provided at the lower end of the lubricating oil circulation hole of the upper oil scraping portion. Sealing rubber layers located on both the front and back sides of the storage channel are hermetically connected to the upper end of the lubricating oil circulation hole of the sealing plate. The support groove and the limiting portion are provided, so that after the oil storage device is fixed through the lubricating oil circulation hole of the sealing plate, it will not slide in the vertical direction of the lubricating oil circulation hole, making the fixation of the oil storage device more secure. And the sealing rubber layers are provided, making the sealing effect of the storage channel better and preventing the overflow of lubricating oil.

[0007] Further improvement: The periphery of the upper end of the convex portion fits with the inner wall of the threaded groove. The convex portion fits with the threaded groove, so that when the screw rod rotates, as much residual lubricating oil in the threaded groove as possible can be scraped up and collected, thereby reducing the loss of lubricating oil during use.

[0008] Further improvement: An accommodation cavity is provided at the connection between the oil delivery channel and the rolling groove, which is opened inside the collection portion. An adsorption ball is rotatably connected inside the accommodation cavity. A rotating shaft is fixedly connected to the center position inside the adsorption ball. A rotating card slot for installing the rotating shaft is opened at the splicing position of the upper ends of the lubricating oil circulation holes of the upper oil scraping portion and the lower oil scraping portion. The left and right ends of the rotating shaft are rotatably connected inside the accommodation cavity. The upper end of the adsorption ball is in contact connection with the threaded groove. The adsorption ball is provided. Since the convex portion cannot perfectly fit with the threaded groove, there must be a gap between the convex portion and the threaded groove. Therefore, the provided adsorption ball can first adhere to the residual lubricating oil in the threaded groove through the adsorption ball in contact with the threaded groove before the convex portion scrapes the lubricating oil, thereby increasing the collection amount of lubricating oil. At the same time, since the convex portion that fits with the threaded groove is provided, the hole at the connection between the oil delivery channel and the threaded groove is relatively enlarged, so that more lubricating oil is required to fill the hole at this place. And the adsorption ball is arranged in the enlarged hole position, which greatly fills the enlarged hole, so that only a certain amount of lubricating oil is needed to fill this position, facilitating the outflow of lubricating oil. At the same time, the two opposite adsorption balls on the left and right can respectively collect and apply lubricating oil according to the moving direction of the upper nut, so as to ensure that the threaded groove inside the upper nut is lubricated by lubricating oil while preventing excess lubricating oil from remaining in the threaded groove that does not interact with the upper nut, making the utilization rate of lubricating oil higher.

[0009] Further improvement: A scraping plate fixedly connected to the upper end of the lubricating oil circulation hole of the lower oil scraping portion is provided inside the accommodation cavity. The scraping plate is located above the left end of the adsorption ball. The upper end of the adsorption ball is in contact with the scraping plate. The scraping plate is provided, which can better scrape the lubricating oil on the adsorption ball, thereby realizing the function of collecting lubricating oil or applying lubricating oil.

[0010] Further improvement: The circulator includes an upper circulator and a lower circulator that are spliced up and down. The inner side of the upper circulator is provided with a first circulation channel, and the inner side of the lower circulator is provided with a second circulation channel. The first circulation channel is connected to the rolling groove. The circulator is formed by splicing the upper circulator and the lower circulator, making the processing and installation of the circulator more convenient.

[0011] Further improvement: The upper end of the upper circulator is provided with a first installation platform around the installation hole. The outer side of the upper circulator is provided with a fixed boss fixed on the first installation platform by screws. The circulator is limited to the upper end of the first installation platform by the fixed boss, making the upper circulator effectively and stably positioned in the up and down directions.

[0012] Further improvement: The connecting part is correspondingly arranged with the installation hole and is in interference fit with the installation hole. The connecting part on the circulator is limited in the installation hole, making the circulator effectively and stably positioned in the four directions of front, back, left, and right, and making the device more stable during operation.

[0013] Further improvement: The left and right sides of the lower circulator are provided with positioning chucks that are clamped inside the upper circulator. The positioning chucks are provided, making the lower circulator effectively and stably positioned in the four directions of front, back, left, and right, and making the positioning of the lower circulator completed successively after the positioning of the upper circulator is completed, making the assembly of the device more convenient and fast.

[0014] Further improvement: A lower nut corresponding to the upper nut is installed on the right side of the upper nut. The outer sides of the upper nut and the lower nut are provided with corresponding installation grooves. A connecting piece is arranged in the installation groove. The connecting piece is fixedly connected to the upper nut and the lower nut by screws respectively. The lower nut and the upper nut form a double-nut structure, making the load-bearing capacity of the device greatly enhanced, and the circulator of this structure is stably and accurately positioned, so that the double-nut screw runs more smoothly.

[0015] Further improvement: The installation hole is an oval hole. The installation hole is inclined and has the same spiral direction as the spiral line of the lower rolling groove. The opening direction of the installation hole is the same as the grooving direction of the rolling groove, so that when the installation hole is opened, a large hole can be opened as much as possible at the connection position of the rolling groove, and at the same time, after the opening is completed, the rolling grooves at the left and right ends of the corresponding position will not be damaged to form broken teeth, thus ensuring the normal use of the nut.

[0016] A method for using a smoothly operating external circulation type ball screw includes the following steps:

[0017] Step 1: First, insert the rotating shafts on the left and right sides of the adsorption ball into the rotating card slots. At the same time, splice the upper oil scraping part on the upper end of the sealing plate to form an oil storage device. Then, insert the collection parts formed by splicing the left and right ends of the spliced oil storage device into the lubricating oil circulation holes and fix them on the outside of the second installation platform with screws. At the same time, make the sealing rubber layer on the upper end of the sealing plate snap into the front and rear ends of the storage channel. Then, insert the lower circulator into the installation hole 5. At the same time, sequentially place the balls into the rolling grooves through the circulation channels of the lower circulator. Then, fix the upper circulator on the outside of the first installation platform with screws. Finally, rotate the assembled upper nut to the outside of the screw rod;

[0018] Step 2: When the screw rod rotates clockwise when viewed from right to left, that is, when the upper nut moves to the right relative to the screw rod, the adsorption ball in the left lubricating oil circulation hole contacts the thread groove on the outside of the screw rod. The adsorption ball adheres the lubricating oil in the thread groove of the screw rod after the ball has separated from the front to the outside of the adsorption ball. At the same time, it rotates under the action of the screw rod. During the rotation, the adhered lubricating oil is scraped off under the action of the scraper and enters the inner side of the oil delivery channel under the action of gravity. After the screw rod adsorbed by the adsorption ball passes through the convex part again, the remaining lubricating oil is scraped up by the convex part and enters the inner side of the oil delivery channel under the action of gravity;

[0019] Step 3: During the process of Step 2, the adsorption ball in the right lubricating oil circulation hole also contacts the thread groove on the outside of the screw rod. When the upper nut moves to the right relative to the screw rod, the adsorption ball rotates under the action of the screw rod. During the rotation, the adsorption ball relatively adsorbs the lubricating oil in the oil delivery channel on its surface and then smears the lubricating oil in the corresponding thread groove of the screw rod through the rotation action. The thread groove after smearing the lubricating oil will then contact the ball under the action of the rotation of the screw rod.

[0020] The beneficial effects of the present invention are as follows: The structure of the present invention is reasonably designed and easy to use. The rolling groove inside the upper nut and the installation hole are obtuse angles, and the circulation channel is lower than the rolling groove, so that the balls can enter and exit the circulator along the ramp channel formed by the installation hole and the rolling groove when entering and exiting the circulator, thus avoiding the collision of the balls with the circulator or the rolling groove when the balls roll, ensuring smooth rolling of the balls, less damage to the balls, and at the same time, the vibration amplitude of the device during use is small. Brief Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the present invention;

[0022] Figure 2 is the exploded view of the upper nut;

[0023] Figure 3 is the installation schematic diagram of the upper oil scraping part;

[0024] Figure 4 is the structural schematic diagram of the circulator;

[0025] Figure 5 is a sectional view of the upper nut;

[0026] Figure 6 is Figure 5 an enlarged view of part A in

[0027] Figure 7 is Figure 5 a view in the B - B direction;

[0028] Figure 8 is a structural schematic diagram of the lubricating oil circulation hole;

[0029] Figure 9 is a bottom view of the upper nut;

[0030] Figure 10 is a top view of the oil storage device;

[0031] Figure 11 is a structural schematic diagram of the collection part;

[0032] Figure 12 is Figure 9 a view in the D - D direction;

[0033] Figure 13 is Figure 12 an enlarged view of part C in

[0034] Figure 14 is a sectional view of a known externally circulating ball screw with a tangent type.

[0035] Explanation of reference numerals: 1, screw; 2, upper nut; 3, through hole; 4, rolling groove; 5, mounting hole; 6, circulator; 7, connecting part; 8, circulation channel; 6 - 1, upper circulator; 6 - 2, lower circulator; 6 - 3, first circulation channel; 6 - 4, second circulation channel; 9, first mounting platform; 10, fixing boss; 11, positioning chuck; 12, lower nut; 13, mounting groove; 14, connecting piece; 15, second mounting platform; 16, lubricating oil circulation hole; 17, oil storage device; 18, collection part; 17 - 1, sealing plate; 17 - 2, upper oil scraping part; 17 - 3, lower oil scraping part; 19, oil delivery channel; 20, storage channel; 21, protruding part; 22, accommodating cavity; 23, adsorption ball; 24, rotating shaft; 25, scraping plate; 26, support groove; 27, limiting part; 28, sealing rubber layer; 29, rotating card slot; 30, thread groove. Detailed implementation manners

[0036] The present invention will be further described below with reference to the accompanying drawings:

[0037] Referring to the attached drawings: In this embodiment, a smoothly operating external circulation type ball screw includes a screw rod 1 and an upper nut 2 located outside the screw rod 1. A through hole 3 for installing the screw rod 1 is opened inside the upper nut 2. A helically arranged rolling groove 4 is opened inside the through hole 3. A number of pairwise corresponding mounting holes 5 are opened on the outer surface of the upper nut 2. A circulator 6 is installed on the outer surface of the upper nut 2. The circulator 6 is provided with a connecting portion 7 inserted into the mounting hole 5. A circulation channel 8 that penetrates the connecting portion 7 and is connected to the rolling groove 4 is opened inside the circulator 6. The included angle between the mounting hole 5 and the rolling groove 4 is β, and β is an obtuse angle. The connection between the circulation channel 8 and the rolling groove 4 is lower than the rolling groove 4. The rolling groove 4 inside the upper nut 2 and the mounting hole 5 form an obtuse angle and the circulation channel 8 is lower than the rolling groove 4, so that the balls can enter and exit the circulator 6 along the ramp channel formed by the mounting hole 5 and the rolling groove 4, thereby avoiding the collision of the balls with the circulator or the rolling groove 4 when the balls roll, ensuring smooth rolling of the balls, causing less damage to the balls, and at the same time, the vibration amplitude of the device during use is small.

[0038] As Figure 3 、 8 and shown in Figure 9, a second mounting platform 15 is opened at the lower end of the upper nut 2. Lubricating oil circulation holes 16 are opened on the inner sides of the left and right ends of the second mounting platform 15. The left and right lubricating oil circulation holes 16 are respectively connected to the rolling grooves 4 on the left and right sides of the mounting hole 5. A fuel storage device 17 is fixedly connected to the lower end of the second mounting platform 15. Collection portions 18 that are clamped inside the lubricating oil circulation holes 16 are provided on the upper left and right sides of the fuel storage device 17. The fuel storage device 17 includes a sealing plate 17-1 and an upper oil scraping portion 17-2 located inside the left and right two lubricating oil circulation holes 16. Lower oil scraping portions 17-3 that are spliced with the upper oil scraping portion 17-2 are provided on the upper sides of the left and right ends of the sealing plate 17-1. The collection portion 18 is formed by the splicing of the upper oil scraping portion 17-2 and the lower oil scraping portion 17-3. An oil delivery channel 19 is opened inside the collection portion 18. The oil delivery channel 19 is connected to the tangent direction of the rolling groove 4. A storage channel 20 connecting the left and right oil delivery channels 19 is opened inside the second mounting platform 15. A protruding portion 21 located in the thread groove 30 is provided on the upper side of the upper oil scraping portion 17-2. A fuel storage device 17 is provided at the lower end of the lower nut 2. The collection portions 18 at the left and right ends of the fuel storage device 17 are located on the left and right sides of the ball circulation channel inside the upper nut 2, so that when the upper nut 2 moves left and right, the lubricating oil on the screw rod that moves out of the upper nut 2 is removed and collected through the collection portion 18. The collected lubricating oil then flows out through the oil delivery channel 19 on the other side to the outside of the screw rod that the upper nut 2 is about to pass through, thereby avoiding the lubricating oil on the screw rod after moving out of the upper nut being affected by the external processing environment, resulting in the normal operation of the screw rod, and at the same time avoiding the need to lubricate the entire screw rod, reducing the loss of lubricating oil, and greatly extending the lubrication time of the device.

[0039] As Figure 8 、 9As shown in FIGS. 9 and 10, a support groove 26 is formed on the second mounting platform 15 outside the lubricating oil circulation hole 16. A limiting portion 27 is provided at the lower end of the upper oil scraping portion 17-2 inside the support groove 26. A sealing rubber layer 28 is hermetically connected to the upper end of the sealing plate 17-1 on both the front and rear sides of the storage channel 20. The support groove 26 and the limiting portion 27 are provided, so that after the oil storage device 17 is fixed through the sealing plate 17-1, it will not slide in the vertical direction of the lubricating oil circulation hole 16, making the fixation of the oil storage device 17 more reliable. And the sealing rubber layer 28 is provided, making the sealing effect of the storage channel 20 better and preventing the overflow of lubricating oil.

[0040] As Figure 13 shown, the periphery of the upper end of the convex portion 21 fits with the inner wall of the threaded groove 30. The convex portion 21 fits with the threaded groove 30, so that when the screw rod 1 rotates, as much residual lubricating oil in the threaded groove 30 as possible can be scraped up and collected, thereby reducing the loss of lubricating oil during use.

[0041] As Figure 10 and 13 shown, at the connection between the oil delivery channel 19 and the rolling groove 4, a receiving cavity 22 is formed inside the collecting portion 18. A suction ball 23 is rotatably connected inside the receiving cavity 22. A rotating shaft 24 is fixedly connected to the center position inside the suction ball 23. A rotating card slot 29 for installing the rotating shaft 24 is formed at the joint of the upper ends of the upper oil scraping portion 17-2 and the lower oil scraping portion 17-3. The left and right ends of the rotating shaft 24 are rotatably connected inside the receiving cavity 22. The upper end of the suction ball 23 is in contact connection with the threaded groove 30. The suction ball 23 is provided. Since the convex portion 21 cannot perfectly fit with the threaded groove 30, there must be a gap between the convex portion 21 and the threaded groove 30. Therefore, the provided suction ball 23 can first adhere to the residual lubricating oil in the threaded groove 30 through the suction ball 23 in contact with the threaded groove 30 before the convex portion 21 scrapes the lubricating oil, thereby increasing the collection amount of lubricating oil. At the same time, since the convex portion 21 that fits with the threaded groove 30 is provided, the hole at the connection between the oil delivery channel 19 and the threaded groove 30 is relatively enlarged, resulting in a need for more lubricating oil to fill the hole at this place. And the suction ball 23 is arranged in the enlarged hole position, which greatly fills the enlarged hole, so that only a certain amount of lubricating oil is needed to fill this position, facilitating the outflow of lubricating oil. At the same time, the two opposite suction balls 23 on the left and right can respectively collect and apply lubricating oil according to the moving direction of the upper nut 2, so as to ensure that the threaded groove 30 inside the upper nut 2 is lubricated with lubricating oil while preventing excess lubricating oil from remaining in the threaded groove 30 that does not interact with the upper nut 2, making the utilization rate of lubricating oil higher.

[0042] As Figure 13As shown, inside the accommodation cavity 22, there is a scraper 25 fixedly connected to the upper end of the lower oil scraping part 17-3. The scraper 25 is located above the left end of the adsorption ball 23. The upper end of the adsorption ball 23 is in contact with the scraper 25. The provision of the scraper 25 can better scrape the lubricating oil on the adsorption ball 23, thereby achieving the function of collecting or applying lubricating oil.

[0043] As Figure 2 shown, the circulator 6 includes an upper circulator 6-1 and a lower circulator 6-2 spliced together vertically. Inside the upper circulator 6-1, there is a first circulation channel 6-3. Inside the lower circulator 6-2, there is a second circulation channel 6-4. The first circulation channel 6-3 is connected to the rolling groove 4. The circulator 6 is formed by splicing the upper circulator 6-1 and the lower circulator 6-2, making the processing and installation of the circulator 6 more convenient.

[0044] As Figure 1 shown, at the upper end of the upper circulator 6-1, there is a first installation platform 9 located around the installation hole 5. On the outside of the upper circulator 6-1, there is a fixed boss 10 fixed to the first installation platform 9 by screws. The circulator 6 is limited to the upper end of the first installation platform 9 by the fixed boss, enabling the upper circulator 6-1 to be effectively and firmly positioned in the vertical direction.

[0045] As Figure 2 and 4 shown, the connecting part 7 is correspondingly arranged with the installation hole 5 and is in interference fit with the installation hole 5. The connecting part 7 on the circulator 6 is limited in the installation hole 5, enabling the circulator 6 to be effectively and firmly positioned in the four directions of front, back, left, and right, making the device more stable during operation.

[0046] As Figure 2 shown, on the left and right sides of the lower circulator 6-2, there are positioning chucks 11 clamped inside the upper circulator 6-1. The provision of the positioning chucks 11 enables the lower circulator 6-2 to be effectively and firmly positioned in the four directions of front, back, left, and right, so that after the upper circulator 6-1 is positioned, the positioning of the lower circulator 6-2 is also completed successively, making the assembly of the device more convenient and fast.

[0047] As Figure 1 and 2 shown, on the right side of the upper nut 2, there is a lower nut 12 correspondingly arranged with the upper nut 2. On the outside of the upper nut 2 and the lower nut 12, there are correspondingly arranged installation grooves 13. Inside the installation grooves 13, there are connecting pieces 14. The connecting pieces 14 are fixedly connected to the upper nut 2 and the lower nut 12 by screws respectively. The provision of the lower nut 12 and the upper nut 2 forms a double-nut structure, greatly enhancing the load-bearing capacity of the device, and the positioning of the circulator in this structure is stable and accurate, thus making the double-nut screw run more smoothly.

[0048] AsFigure 7 As shown, the mounting hole 5 is an oval hole. The mounting hole 5 is inclined and has the same spiral direction as the spiral line of the lower rolling groove 4. The opening direction of the mounting hole 5 is the same as the grooving direction of the rolling groove 4, so that when the mounting hole 5 is opened, a larger hole can be opened as much as possible at the connection position of the rolling groove 4, and at the same time, after the opening is completed, the rolling grooves 4 at the left and right ends of the corresponding position will not be damaged to form broken teeth, thus ensuring the normal use of the nut.

[0049] A method for using a smoothly operating external circulation type ball screw includes the following steps:

[0050] Step 1: First, insert the rotating shafts 24 on the left and right sides of the adsorption ball 23 into the rotating card slots 29. At the same time, splice the upper oil scraping part 17-2 to the upper end of the sealing plate 17-1 to form an oil storage device 17. Then, insert the collecting part 18 formed by splicing the left and right ends of the spliced oil storage device 17 into the lubricating oil circulation hole 16 and fix it to the outside of the second installation platform 15 with screws. At the same time, make the sealing rubber layer 28 on the upper end of the sealing plate 17-1 snap into the front and rear ends of the storage channel 20. Then, insert the lower circulator 6-2 into the mounting hole 5. At the same time, sequentially place the balls into the rolling groove 4 through the circulation channel 8 of the lower circulator 6-2. Then, fix the upper circulator 6-1 to the outside of the first installation platform 9 with screws in sequence. Finally, rotate the assembled upper nut 2 to the outside of the screw 1;

[0051] Step 2: When the screw 1 rotates clockwise when viewed from right to left, that is, when the upper nut 2 moves to the right relative to the screw 1, the adsorption ball 23 in the left lubricating oil circulation hole 16 contacts the thread groove on the outside of the screw 1. The adsorption ball 23 adheres the lubricating oil in the thread groove of the screw 1 that has separated from the ball in front to the outside of the adsorption ball 23. At the same time, it rotates under the action of the screw 1. During the rotation, the adhered lubricating oil is scraped off under the action of the scraper 25 and enters the inside of the oil delivery channel under the action of gravity. After the screw 1 adsorbed by the adsorption ball 23 passes through the convex part 21 again, the remaining lubricating oil is scraped up by the convex part 21 and enters the inside of the oil delivery channel 19 under the action of gravity;

[0052] Step 3: During the process of Step 2, the adsorption ball 23 in the right lubricating oil circulation hole 16 also contacts the thread groove on the outside of the screw 1. When the upper nut 2 moves to the right relative to the screw 1, the adsorption ball 23 rotates under the action of the screw 1. During the rotation, the adsorption ball 23 relatively adsorbs the lubricating oil in the oil delivery channel 19 on the surface, and then applies the lubricating oil to the thread groove of the corresponding screw through the rotation action. The thread groove after applying the lubricating oil will then contact the ball under the action of the rotation of the screw.

[0053] Although the present invention has been illustrated and described with reference to preferred embodiments, those of ordinary skill in the art should understand that various changes in form and detail may be made within the scope of the claims.

Claims

1. A smoothly operating external circulation ball screw, comprising a screw rod (1) and an upper nut (2) located outside the screw rod (1). A through hole (3) for installing the screw rod (1) is opened on the inner side of the upper nut (2). A helically arranged rolling groove (4) is opened on the inner side of the through hole (3). A thread groove (30) corresponding to the rolling groove (4) is opened on the outer side of the screw rod (1). A number of pairwise corresponding installation holes (5) are opened on the outer surface of the upper nut (2). A circulator (6) is installed on the outer surface of the upper nut (2). A connecting portion (7) inserted into the installation hole (5) is provided on the circulator (6). A circulation channel (8) passing through the connecting portion (7) and connected to the rolling groove (4) is opened on the inner side of the circulator (6). The characteristics are as follows: The included angle between the installation hole (5) and the rolling groove (4) is an obtuse angle, and the connection part of the circulation channel (8) and the rolling groove (4) is arranged lower than the rolling groove (4). A second installation platform (15) is formed at the lower end of the upper nut (2). Lubricating oil circulation holes (16) are formed at the inner sides of the left and right ends of the second installation platform (15). The left and right lubricating oil circulation holes (16) are respectively connected to the rolling grooves (4) on the left and right sides of the installation hole (5). A fuel storage device (17) is fixedly connected to the lower end of the second installation platform (15). Collection parts (18) which are clamped inside the lubricating oil circulation holes (16) are arranged at the upper left and right sides of the fuel storage device (17). The fuel storage device (17) comprises a sealing plate (17-1) and an upper oil scraping part (17-2) positioned inside the left and right two lubricating oil circulation holes (16). Lower oil scraping parts (17-3) which are spliced with the upper oil scraping part (17-2) are arranged at the upper sides of the left and right ends of the sealing plate (17-1). The collection parts (18) are formed by splicing the upper oil scraping part (17-2) and the lower oil scraping part (17-3). An oil transmission channel (19) is formed inside the collection part (18), and the oil transmission channel (19) is connected to the tangential direction of the rolling groove (4). A storage channel (20) for connecting the left and right oil transmission channels (19) is formed inside the second installation platform (15). A convex part (21) positioned inside the thread groove (30) is arranged at the upper side of the upper oil scraping part (17-2).

2. A smoothly operating external circulation ball screw according to claim 1, characterized in that: A support groove (26) positioned outside the lubricating oil circulation hole (16) is formed on the second installation platform (15). A limiting part (27) positioned inside the support groove (26) is arranged at the lower end of the upper oil scraping part (17-2). Sealing rubber layers (28) positioned at the front and back sides of the storage channel (20) are hermetically connected to the upper end of the sealing plate (17-1).

3. A smoothly operating external circulation type ball screw according to claim 1, characterized in that: The periphery of the upper end of the convex part (21) is attached to the inner wall of the thread groove (30).

4. A smoothly operating external circulation ball screw according to claim 3, characterized in that: An accommodation cavity (22) which is formed inside the collection part (18) is arranged at the connection part of the oil transmission channel (19) and the rolling groove (4). An adsorption ball (23) is rotatably connected inside the accommodation cavity (22). A rotating shaft (24) is fixedly connected to the central position inside the adsorption ball (23). A rotating card slot (29) for installing the rotating shaft (24) is formed at the splicing part of the upper ends of the upper oil scraping part (17-2) and the lower oil scraping part (17-3). The left and right ends of the rotating shaft (24) are rotatably connected inside the accommodation cavity (22). The upper end of the adsorption ball (23) is in contact connection with the thread groove (30).

5. A smoothly operating outer circulation type ball screw according to claim 4, characterized in that: A scraping plate (25) fixedly connected to the upper end of the lower oil scraping part (17-3) is arranged inside the accommodation cavity (22). The scraping plate (25) is positioned at the upper side of the left end of the adsorption ball (23), and the upper end of the adsorption ball (23) is arranged in contact with the scraping plate (25).

6. The smooth-running external circulation ball screw according to claim 1, wherein: The circulator (6) includes an upper circulator (6-1) and a lower circulator (6-2) spliced vertically. A first circulation channel (6-3) is provided inside the upper circulator (6-1), and a second circulation channel (6-4) is provided inside the lower circulator (6-2). The first circulation channel (6-3) is connected to the rolling groove (4). The upper end of the upper circulator (6-1) is provided with a first installation platform (9) around the installation hole (5). A fixing boss (10) is provided outside the upper circulator (6-1) and is fixed to the first installation platform (9) by screws.

7. A smoothly operating external circulation type ball screw according to claim 1, characterized in that: A lower nut (12) corresponding to the upper nut (2) is installed on the right side of the upper nut (2). Installation grooves (13) are provided on the outer sides of the upper nut (2) and the lower nut (12). A connecting member (14) is provided in the installation groove (13). The connecting member (14) is fixedly connected to the upper nut (2) and the lower nut (12) by screws respectively.

8. A smoothly operating external circulation ball screw according to claim 1, characterized in that: The installation hole (5) is an oval hole. The installation hole (5) is inclined and has the same spiral direction as the spiral line of the lower rolling groove (4).

9. The usage method of an externally circulating ball screw with smooth operation according to claim 5 includes the following steps: Step 1: First, insert the rotating shafts (24) on the left and right sides of the adsorption ball (23) into the rotating card slots (29). At the same time, splice the upper oil scraping part (17-2) on the upper end of the sealing plate (17-1) to form an oil storage device (17). Then, insert the collection parts (18) formed by splicing the left and right ends of the spliced oil storage device (17) into the lubricating oil circulation holes (16) and fix them to the outside of the second installation platform (15) by screws. At the same time, make the sealing rubber layer (28) on the upper end of the sealing plate (17-1) snap into the front and rear ends of the storage channel (20). Step 2: When the screw rod (1) rotates clockwise when viewed from right to left, that is, when the upper nut (2) moves to the right relative to the screw rod (1), the adsorption ball (23) in the left lubricating oil circulation hole (16) contacts the thread groove on the outside of the screw rod (1). The adsorption ball (23) adheres the lubricating oil in the thread groove of the screw rod (1) after separating from the ball from the front to the outside of the adsorption ball (23). At the same time, it rotates under the action of the screw rod (1). During the rotation, the adhered lubricating oil is scraped off under the action of the scraper (25) and enters the inside of the oil delivery channel under the action of gravity. After the screw rod (1) adsorbed by the adsorption ball (23) passes through the convex part (21) again, the residual lubricating oil is scraped up by the convex part (21) and enters the inside of the oil delivery channel (19) under the action of gravity. Step 3: During Step 2, the adsorption balls (23) in the right-end lubricating oil circulation holes (16) also come into contact with the thread grooves on the outer side of the screw (1). When the upper nut (2) moves rightward relative to the screw (1), the adsorption balls (23) rotate under the action of the screw (1). During the rotation process, the adsorption balls (23) relatively adsorb the lubricating oil in the oil delivery channels (19) on the surface, and then apply the lubricating oil to the corresponding thread grooves (30) of the screw (1) through the rotation action. The thread grooves (30) after being lubricated will subsequently come into contact with the balls under the action of the rotation of the screw (1).

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