A speed reducer with dynamic shaft-end seal

Abstract

The present invention relates to the field of transmission technology, and particularly provides a speed reducer with dynamic shaft-end sealing, including: a housing, a rotating shaft, a rotating member, and two sealing components. Among them, a spiral sealing groove is formed in the area of the rotating shaft corresponding to the rotating member. The sealing component includes a static plate, a dynamic plate, and a base plate sleeved on the rotating shaft; the dynamic plate is arranged between the static plate and the base plate; a plurality of spiral grooves are arranged at intervals on the end surface of the dynamic plate facing the static plate. During the rotation of the rotating shaft, the dynamic plate is configured to rotate under the drive of the rotating shaft, so that a dynamic pressure is formed in the grooves, attracting the surrounding fluid to form a fluid film between the dynamic plate and the static plate. The rotating member is configured to rotate around the center of the spherical surface under the push of the static plate, improving the coaxiality between the rotating member and the rotating shaft. The solution of the present invention uses the fluid film to push the static plate, and then pushes the rotating member to rotate in the direction of offset from the rotating shaft, improving the coaxiality between the rotating member and the rotating shaft and enhancing the sealing effect.

Description

Technical Field

[0001] The invention relates to the field of transmission technology, in particular to a reducer with a shaft end dynamic seal. Background Art

[0002] The reducer is an independent component consisting of a gear transmission, a worm transmission, or a gear-worm transmission enclosed in a rigid housing. It is often used as a reduction transmission device between the prime mover and the working machine. In order to extend the service life of the transmission structure and maintain a good working condition, the reducer generally adopts oil immersion lubrication, which can not only reduce the friction and wear of the transmission parts, but also effectively cool down the temperature, thereby improving the operating efficiency and reliability of the reducer.

[0003] The application of oil-immersion lubrication has put forward higher requirements on the sealing performance of the reducer. In the prior art, when the shaft of the reducer extends out of the housing, a spiral seal is usually used to prevent the leakage of lubricating oil. However, during the actual operation of the reducer, due to the influence of various dynamic factors, such as bearing clearance, load changes, etc., the shaft end of the shaft may be deflected relative to the mounting hole. This deflection phenomenon will cause eccentricity between the shaft end of the shaft and the sealing structure in the mounting hole, thereby causing uneven changes in the sealing gap. The originally designed tight sealing structure may fail due to excessive local gaps, which seriously affects the sealing effect of the reducer. Summary of the invention

[0004] The purpose of the present invention is to improve the sealing effect of the reducer.

[0005] In particular, the present invention provides a reducer with a dynamic seal on the shaft end, comprising: a housing, with symmetrical mounting holes formed on both sides thereof; a rotating shaft, arranged on the housing; one end of the rotating shaft is arranged in a mounting hole, and the other end passes through the symmetrical mounting hole and extends out of the housing; a rotating member, which is annular, sleeved on the end of the rotating shaft extending out of the housing, and is located in the corresponding mounting hole; an annular spherical surface is formed on the side wall surface of the rotating member; a spiral sealing groove is formed on the area of ​​the rotating shaft corresponding to the rotating member; two sealing assemblies are sleeved on the rotating shaft and are respectively located at the axial ends of the rotating member; each sealing assembly includes a static plate, a dynamic plate and a base plate sleeved on the rotating shaft The plate is a static plate that abuts against the rotating part; the dynamic plate is arranged between the static plate and the base plate; a plurality of spiral grooves are arranged at intervals on the end surface of the dynamic plate facing the static plate, and the end of the groove that is away from the axis of the dynamic plate passes through the side wall of the dynamic plate; a plurality of compression springs are arranged between the base plate and the dynamic plate; during the rotation of the rotating shaft, the dynamic plate is configured to rotate under the drive of the rotating shaft, so that dynamic pressure is formed in the groove, and the surrounding fluid is attracted to form a fluid film between the dynamic plate and the static plate, and the rotating part is configured to rotate around the center of the spherical surface under the push of the static plate, so that the coaxiality of the rotating part and the rotating shaft is improved; after the rotating shaft stops rotating, the dynamic plate is pressed against the static plate under the pressure of the plurality of compression springs.

[0006] Further, the speed reducer with shaft-end dynamic seal further includes: a mounting seat sleeved on the outer periphery of the rotating member, and an annular spherical groove adapted to the spherical curved surface of the rotating member is formed on the inner wall surface of the mounting seat; an annular mounting plate is respectively arranged at both ends of the mounting seat, and a plurality of fastening holes are arranged at intervals on the mounting plate; an annular end cover is fixedly mounted on the housing and sleeved on the outer periphery of the mounting seat; the annular end cover includes an end plate mounted on the side wall of the housing and a mounting cylinder extending from the end plate into the mounting hole; a corresponding annular step surface adapted to the mounting plate is arranged on the mounting cylinder; a plurality of fasteners are arranged in one-to-one correspondence with the plurality of fastening holes; each fastener passes through the corresponding fastening hole and is connected to the annular step surface.

[0007] Further, at least one sealing strip is arranged between the mounting seat and the rotating member.

[0008] Further, annular mounting grooves are respectively formed at both ends of the rotating member, and annular protrusions are respectively formed on the end surfaces of the static plates facing the rotating member, and the protrusions are respectively embedded in the corresponding mounting grooves.

[0009] Further, the size of the slotted opening is proportional to the viscous resistance of the fluid around it.

[0010] Further, the substrate is fixedly connected to the rotating shaft, and a plurality of connecting columns are arranged at intervals on the end surface of the substrate facing the moving plate; the connecting columns are connected to the moving plate to drive the moving plate to rotate.

[0011] Further, a plurality of rotatable mounting platforms are arranged on the moving plate, one end of the mounting platform facing the static plate is flush with the end surface of the moving plate, and a first magnet is embedded at one end of each mounting platform facing the static plate; a plurality of second magnets are arranged on the static plate, and the plurality of second magnets are in one-to-one correspondence with the plurality of first magnets; when the moving plate and the static plate are in contact, the first magnet and the second magnet attract each other; during the process that the moving plate moves away from the static plate, the mounting platform rotates so that the first magnet and the second magnet repel each other.

[0012] Further, a threaded hole is arranged at one end of the mounting platform facing the moving plate; an external thread adapted to the threaded hole is formed at the top of the connecting column, and the plurality of connecting columns and the plurality of threaded holes are in one-to-one correspondence; when the moving plate is in close contact with the static plate, the connecting column partially extends into the threaded hole; when the moving plate moves away from the static plate, the connecting column extends deep into the threaded hole to make the mounting platform rotate; wherein, after the connecting column completely extends into the threaded hole, the mounting platform rotates 180° compared with the initial position.

[0013] Further, one end of the mounting platform facing the substrate extends out of the moving plate, and a fastening ring is arranged at the end of the mounting platform extending out of the moving plate; the fastening ring is sleeved on the outer periphery of the mounting platform and abuts against the end surface of the moving plate.

[0014] Further, the number of the connecting columns is the same as the number of the compression springs, and the plurality of compression springs are respectively sleeved on the outer peripheries of the plurality of connecting columns.

[0015] The beneficial effects of the present invention are as follows:

[0016] For the speed reducer with shaft-end dynamic seal of the present invention, spiral sealing is achieved by arranging a spiral sealing groove at the end of the rotating shaft and sleeving a rotating member thereon. On this basis, sealing components capable of generating a fluid film are arranged at both ends of the rotating member, which not only further improves the sealing effect, but also reduces wear and increases the service life. During the rotation of the rotating shaft, when the rotating shaft deflects, the gap between the moving plate and the static plate changes. The gap in the area in the same direction as the deflection direction of the rotating shaft decreases, and the pressure of the fluid film increases; the gap in the area in the opposite direction to the deflection direction of the rotating shaft increases, and the pressure of the fluid film decreases. The static plate receives a greater thrust from the fluid film in the area in the same direction as the deflection direction of the rotating shaft. By arranging the static plate to press against the rotating member, the static plate is used to push the rotating member to rotate in the direction of the deflection of the rotating shaft, so that the axis of the rotating member approaches the axis of the rotating shaft, improving the coaxiality between the rotating member and the rotating shaft, and thus enhancing the sealing effect.

[0017] Furthermore, for the speed reducer with shaft-end dynamic seal of the present invention, by arranging a first magnet on the moving plate and a second magnet on the static plate, when the moving plate and the static plate are attached, the first magnet and the second magnet attract each other, making the attachment between the moving plate and the static plate closer, thereby further improving the sealing effect. When the moving plate is away from the static plate, the first magnet and the second magnet repel each other, and the repulsive force between the magnets is used to better push the rotation of the rotating member, further improving the coaxiality between the rotating member and the rotating shaft and ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a speed reducer with shaft-end dynamic seal according to an embodiment of the present invention;

[0020] Figure 2 is an exploded schematic diagram of a speed reducer with shaft-end dynamic seal according to an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of another angle of a speed reducer with shaft-end dynamic seal according to an embodiment of the present invention;

[0022] Figure 4 is along Figure 3 the schematic cross-sectional view taken along the cutting line A-A in

[0023] Figure 5 is Figure 4Schematic enlarged view of the middle region B;

[0024] Figure 6 is Figure 5 Schematic enlarged view of the middle region C;

[0025] Figure 7 is Figure 5 Schematic structural diagram of the rotating shaft shown in the figure when it is in a rotating state;

[0026] Figure 8 is Figure 7 Schematic enlarged view of the middle region D;

[0027] Figure 9 Schematic structural diagram of the stationary plate according to an embodiment of the present invention;

[0028] Figure 10 Schematic structural diagram of the moving plate according to an embodiment of the present invention;

[0029] Figure 11 Schematic structural diagram of the substrate according to an embodiment of the present invention;

[0030] Figure 12 Schematic structural diagram of the rotating member according to an embodiment of the present invention;

[0031] Figure 13 Schematic structural diagram of the mounting seat according to an embodiment of the present invention;

[0032] Figure 14 Schematic structural diagram of the mounting table and the fastening ring according to an embodiment of the present invention;

[0033] Wherein:

[0034] 100, housing; 110, mounting hole; 200, rotating shaft; 210, spiral sealing groove; 220, bearing; 300, rotating member; 310, spherical surface; 320, mounting groove; 400, sealing assembly; 410, stationary plate; 411, protrusion; 412, second magnet; 420, moving plate; 421, slot; 422, mounting table; 423, first magnet; 424, threaded hole; 425, fastening ring; 426, sealing ring; 430, substrate; 431, connecting column; 432, external thread; 440, compression spring; 500, mounting seat; 510, first member; 520, second member; 530, spherical groove; 540, annular mounting plate; 541, fastening hole; 550, fastener; 560, sealing strip; 600, annular end cover; 610, end plate; 620, mounting cylinder. Detailed implementation mode

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] In this article, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, including one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0037] Unless otherwise clearly specified and defined, the terms such as "installed", "connected", "connected", "fixed", "coupled", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0038] It should be understood that the orientation or positional relationship indicated by the terms "radial", "axial", "circumferential", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0039] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0040] The following refers to Figures 1 to 14 to describe a speed reducer with dynamic shaft-end seal provided by the present invention.

[0041] This embodiment provides a speed reducer with dynamic shaft-end seal. Generally, a speed reducer with dynamic shaft-end seal may include: a housing 100, a rotating shaft 200, a rotating member 300, and two sealing assemblies 400.

[0042] Symmetrical mounting holes 110 are formed on both sides of the housing 100. The rotating shaft 200 is arranged on the housing 100. One end of the rotating shaft 200 is arranged in one mounting hole 110, and the other end passes through the symmetrical mounting hole 110 and extends out of the housing 100. The rotating member 300 is annular, sleeved on the end of the rotating shaft 200 extending out of the housing 100, and is located in the corresponding mounting hole 110. An annular spherical curved surface 310 is formed on the side wall surface of the rotating member 300. A spiral sealing groove 210 is formed on the rotating shaft 200 in an area corresponding to the rotating member 300.

[0043] Two sealing assemblies 400 are sleeved on the rotating shaft 200 and are respectively located at the axial ends of the rotating member 300. Each sealing assembly 400 includes a static plate 410 sleeved on the rotating shaft 200, a dynamic plate 420 and a base plate 430, the static plate 410 abuts against the rotating member 300; the dynamic plate 420 is arranged between the static plate 410 and the base plate 430; a plurality of spiral grooves 421 are arranged at intervals on the end surface of the dynamic plate 420 facing the static plate 410, and one end of the groove 421 away from the axis of the dynamic plate 420 passes through the side wall of the dynamic plate 420; a plurality of compression springs 440 are arranged between the base plate 430 and the dynamic plate 420.

[0044] During the rotation of the rotating shaft 200, the moving plate 420 is configured to rotate under the drive of the rotating shaft 200, so that dynamic pressure is formed in the slot 421, attracting the surrounding fluid to form a fluid film between the moving plate 420 and the static plate 410; the rotating member 300 is configured to rotate around the center of the spherical surface 310 under the push of the static plate 410, so that the coaxiality of the rotating member 300 and the rotating shaft 200 is improved. After the rotating shaft 200 stops rotating, the moving plate 420 is pressed against the static plate 410 by a plurality of compression springs 440.

[0045] Since the housing 100 is filled with lubricating oil and the reducer generates heat during operation, the internal pressure of the reducer is greater than the external pressure. A spiral seal is achieved by providing a spiral sealing groove 210 at the end of the rotating shaft 200 and sleeved with a rotating member 300. The spiral sealing groove 210 is filled with sealing liquid, which can be the lubricating oil in the housing 100 or other liquid used for sealing that is separately filled during assembly. It is understandable that the rotation direction of the spiral sealing groove 210 is compatible with the rotation direction of the rotating shaft 200. Figure 1 For example, when the spiral seal groove 210 rotates right, the rotation direction of the shaft 200 is counterclockwise; when the spiral seal groove 210 rotates left, the rotation direction of the shaft 200 is clockwise. As the shaft 200 rotates, the sealing liquid in the spiral seal groove 210 is continuously pushed toward the inside of the housing 100, so that the pressure of the spiral seal groove 210 close to the inside of the housing 100 gradually increases, thereby improving the sealing effect.

[0046] On this basis, sealing assemblies 400 capable of generating fluid films are provided at both ends of the rotating member 300, which not only further improves the sealing effect, but also reduces the wear risk and increases the service life.

[0047] During the rotation of the rotating shaft 200, when the rotating shaft 200 is offset, the gap between the moving plate 420 and the static plate 410 changes. The gap in the area in the same direction as the offset direction of the rotating shaft 200 decreases, and the pressure of the fluid film increases; the gap in the area in the opposite direction to the offset direction of the rotating shaft 200 increases, and the pressure of the fluid film decreases. The static plate 410 receives a greater thrust in the area in the same direction as the offset direction of the rotating shaft 200. By setting the static plate 410 to abut against the rotating member 300, the static plate 410 is used to push the rotating member 300 to rotate in the direction of the offset of the rotating shaft 200, so that the axis of the rotating member 300 is close to the axis of the rotating shaft 200, thereby improving the coaxiality between the rotating member 300 and the rotating shaft 200, and further enhancing the sealing effect.

[0048] In some embodiments, a sealing ring 426 may also be provided between the moving plate 420 and the rotating shaft 200 to further improve the sealing effect.

[0049] As Figure 4 shown, a bearing 220 is also sleeved on one end of the rotating shaft 200 extending out of the housing 100, and the bearing 220 is arranged on the side of the sealing assembly 400 facing the inside of the housing 100. One end of the rotating shaft 200 that does not extend out of the housing 100 is only installed in the corresponding installation hole 110 through a sleeved bearing 220. Generally, a circular end cover may be provided at the installation hole 110 to close the installation hole 110 and complete the sealing.

[0050] Generally, a speed reducer with dynamic shaft-end sealing may also include: a mounting seat 500, an annular end cover 600, and a plurality of fasteners 550.

[0051] The mounting seat 500 is sleeved on the outer periphery of the rotating member 300, and an annular spherical groove 530 adapted to the spherical curved surface 310 of the rotating member 300 is formed on the inner wall surface of the mounting seat 500. An annular mounting plate 540 is provided at each end of the mounting seat 500, and a plurality of fastening holes 541 are arranged at intervals on the mounting plate. The annular end cover 600 is fixedly installed on the housing 100 and sleeved on the outer periphery of the mounting seat 500. The annular end cover 600 includes an end plate 610 installed on the side wall of the housing 100, and a mounting cylinder 620 extending from the end plate 610 into the installation hole 110. An annular step surface adapted to the annular mounting plate 540 is correspondingly provided on the mounting cylinder 620; a plurality of fasteners 550 are arranged in one-to-one correspondence with the plurality of fastening holes 541. Each fastener 550 passes through the corresponding fastening hole 541 and is connected to the annular step surface.

[0052] In the solution of this embodiment, by providing a mounting seat 500 adapted to the rotating member 300 and using the spherical groove 530 of the mounting seat 500 to guide the rotation of the rotating member 300, the rotation of the rotating member 300 becomes smoother.

[0053] An annular mounting plate 540 is provided on the mounting seat 500, and a corresponding annular step surface is provided on the inner wall of the mounting cylinder 620. This not only makes the connection between the mounting seat 500 and the mounting seat 500 tighter, but also the stepped contact surface reduces the leakage risk and improves the sealing effect.

[0054] Using a plurality of fasteners 550, the mounting seat 500 is mounted on the annular end cover 600, making the mounting seat 500 fixed relative to the housing 100 and improving the structural stability of the device. In some embodiments, the fasteners 550 can be screws or bolts.

[0055] In some embodiments, a plurality of fastening bolts can be provided on the end plate 610 of the annular end cover 600 to fixedly mount the annular end cover 600 to the housing 100.

[0056] At least one sealing strip 560 is provided between the mounting seat 500 and the rotating member 300.

[0057] In the solution of this embodiment, by providing a sealing strip 560 between the mounting seat 500 and the rotating member 300, the sealing effect is further improved.

[0058] As Figure 5 shown, in some embodiments, the mounting seat 500 can be composed of a first member 510 and a second framework. The first member 510 and the second member 520 are symmetrically arranged along the radial direction. The first member 510 and the second member 520 are sleeved on the rotating member 300 and butt together, reducing the installation difficulty of the mounting seat 500. A sealing strip 560 is provided between the first member 510, the second member 520 of the mounting seat 500 and the rotating member 300 to improve the sealing effect.

[0059] Annular mounting grooves 320 are respectively formed at both ends of the rotating member 300, and annular protrusions 411 are respectively formed on the end faces of the static plate 410 facing the rotating member 300. The protrusions 411 are respectively embedded in the corresponding mounting grooves 320.

[0060] In the solution of this embodiment, by respectively providing the protrusions 411 and the mounting grooves 320 on the static plate 410 and the rotating member 300 and using their embedded structure, not only the connection tightness between the static plate 410 and the rotating member 300 is improved, but also the radial movement of the static plate 410 is avoided, improving the structural stability. The annular structure setting of the protrusions 411 and the mounting grooves 320 makes the contact force between the static plate 410 and the rotating member 300 more evenly distributed.

[0061] The size of the slot 421 is proportional to the viscous resistance of the fluid around it.

[0062] The greater the viscous resistance of the fluid, the greater the dynamic pressure required to attract the fluid to form a fluid film, and the larger the size of the slot 421.

[0063] In the solution of this embodiment, setting the size of the slot 421 to be proportional to the viscous resistance of the fluid around it ensures that the slot 421 can have sufficient dynamic pressure, enabling the fluid film to be formed smoothly, thereby ensuring the sealing effect.

[0064] In some embodiments, the housing 100 is filled with lubricating oil. During the rotation of the rotating shaft 200, the sealing assembly 400 provided on the inner side of the housing 100 attracts the surrounding lubricating oil to form an oil film. During the rotation of the sealing assembly 400 provided on the outer side of the housing 100, it attracts the surrounding air to form an air film. The viscous resistance of the oil film is relatively large, and the size of the slot 421 of the sealing assembly 400 provided on the inner side of the housing 100 is correspondingly set larger, and the pressure of the formed oil film is also greater, which is more conducive to driving the rotating member 300 to rotate, improving the coaxiality between the rotating member 300 and the rotating shaft 200, and thus improving the sealing effect.

[0065] The substrate 430 is fixedly connected to the rotating shaft 200, and a plurality of connecting columns 431 are spaced apart on the end surface of the substrate 430 facing the moving plate 420. The connecting columns 431 are connected to the moving plate 420 to drive the moving plate 420 to rotate.

[0066] In the solution of this embodiment, by providing the connecting columns 431 on the substrate 430 and using the connecting columns 431 to connect the moving plate 420 and the substrate 430, the moving plate 420 can rotate synchronously with the rotating shaft 200.

[0067] In some embodiments, the moving plate 420 is provided with through holes adapted to the connecting columns 431, so that while the connecting columns 431 can drive the moving plate 420 to rotate, the moving plate 420 can move axially along the connecting columns 431 under the push of the fluid film.

[0068] In other embodiments, the moving plate 420 and the rotating shaft 200 can be connected by a key. A first keyway is provided axially on the rotating shaft 200, a key is provided in the keyway, and a corresponding second keyway is provided on the inner wall surface of the moving plate 420. Among them, the second keyway is set as a through slot, which is not only convenient for installation, but also enables the moving plate 420 to rotate and move axially under the push of the fluid film when the rotating shaft 200 rotates.

[0069] A plurality of rotatable mounting platforms 422 are provided on the moving plate 420. One end of the mounting platform 422 facing the static plate 410 is flush with the end face of the moving plate 420, and a first magnet 423 is embedded at one end of each mounting platform 422 facing the static plate 410. A plurality of second magnets 412 are provided on the static plate 410, and the plurality of second magnets 412 correspond to the plurality of first magnets 423 one by one. When the moving plate 420 and the static plate 410 are in contact, the first magnet 423 attracts the second magnet 412. During the process of the moving plate 420 moving away from the static plate 410, the mounting platform 422 rotates, causing the first magnet 423 to repel the second magnet 412.

[0070] In the solution of this embodiment, by providing the first magnet 423 on the moving plate 420 and the second magnet 412 on the static plate 410, when the moving plate 420 and the static plate 410 are in contact (i.e., when the rotating shaft 200 stops rotating), the first magnet 423 and the second magnet 412 attract each other, making the contact between the moving plate 420 and the static plate 410 closer, thereby further improving the sealing effect. When the moving plate 420 moves away from the static plate 410 (i.e., when the rotating shaft 200 rotates), the first magnet 423 and the second magnet 412 repel each other, and the repulsive force between the magnets is used to better drive the rotation of the rotating member 300, further improving the coaxiality between the rotating member 300 and the rotating shaft 200 and ensuring the sealing effect. In addition, the first magnet 423 and the second magnet 412 are distributed at intervals on the moving plate 420 and the static plate 410, so that during the rotation of the moving plate 420, the magnetic repulsive force received is not constant, but a changing magnetic repulsive force with a certain impact, which is more conducive to driving the rotation of the rotating member 300, further improving the coaxiality between the rotating member 300 and the rotating shaft 200 and enhancing the sealing effect.

[0071] As Figures 9 - 10 shown, the first magnet 423 and the second magnet 412 can be strip-shaped magnets, and the length directions of the first magnet 423 and the second magnet 412 are both consistent with the radial direction of the rotating shaft 200. The setting directions of the magnetic poles of the plurality of first magnets 423 on the moving plate 420 are the same (i.e., the magnetic poles located in the inner circle and the outer circle are respectively unified), and the setting directions of the magnetic poles of the plurality of second magnets 412 on the static plate 410 are also the same. When the static plate 410 and the moving plate 420 are in contact, the magnetic poles of the first magnet 423 are exactly opposite to the magnetic poles of the relative second magnet 412, making the moving plate 420 closely adhere to the static plate 410.

[0072] In some preferred embodiments, the plurality of first magnets 423 and the plurality of second magnets 412 are both evenly distributed along the circumferential direction.

[0073] In some embodiments, a threaded hole 424 is provided at one end of the mounting table 422 facing the moving plate 420. An external thread 432 adapted to the threaded hole 424 is formed at the top of the connecting column 431, and a plurality of connecting columns 431 and a plurality of threaded holes 424 correspond to each other one by one. When the moving plate 420 abuts against the static plate 410, a part of the connecting column 431 extends into the threaded hole 424. When the moving plate 420 moves away from the static plate 410, the connecting column 431 extends deeper into the threaded hole 424, causing the mounting table 422 to rotate. Among them, after the connecting column 431 completely extends into the threaded hole 424, the mounting table 422 rotates 180° compared to the initial position.

[0074] By providing the threaded hole 424 on the mounting table 422, providing the external thread 432 on the connecting column 431, and setting the allowance for the connecting column 431 to continue to rotate deeper into the threaded hole 424 so that the mounting table 422 rotates 180°. Using the force of the fluid film to push the moving plate 420 to move, driving the rotation of the mounting table 422, so that the opposite magnetic poles of the first magnet 423 and the second magnet 412 change from opposite magnetic poles to the same magnetic poles, thereby changing the magnetic force between the moving plate 420 and the static plate 410 from attraction to repulsion, with a delicate structure, stable and reliable.

[0075] In some other embodiments, the number of turns of the external thread 432 on the connecting column 431 is specially set. After the connecting rod is assembled with the threaded hole 424 of the moving plate 420, when the connecting rod rotates in the direction of extending deeper into the threaded hole 424, the connecting rod can only continue to rotate half a turn relative to the threaded hole 424 and cannot continue to rotate due to the interference between the rod body and the thread. It is ensured that the number of rotatable turns of the mounting seat 500 is exactly half a turn, thereby changing the interaction of the magnetic poles between the first magnet 423 and the second magnet 412.

[0076] In still some other embodiments, a rotating rod extending out of the moving plate 420 may be provided at one end of the mounting table 422 facing the substrate 430. Threads may be provided at the end of the rotating rod facing the substrate 430, and corresponding threaded holes may be provided on the connecting column 431. The rotating rod extends into the connecting column 431, and by using the threaded fit between the rotating rod and the connecting column 431, when the moving plate 420 moves axially, the mounting table 422 is driven to rotate.

[0077] One end of the mounting table 422 facing the substrate 430 extends out of the moving plate 420, and a fastening ring 425 is provided at the end of the mounting table 422 extending out of the moving plate 420. The fastening ring 425 is sleeved on the outer periphery of the mounting table 422 and abuts against the end face of the moving plate 420.

[0078] In the solution of this embodiment, by providing the fastening ring 425 to limit the mounting table 422, the risk of the mounting table 422 falling off the moving plate 420 is reduced, and the structural stability is improved.

[0079] In some embodiments, the diameter of the portion of the mounting table 422 embedded with the first magnet 423 is larger than the diameter of the portion formed with the threaded hole 424, so that an annular limiting step surface is formed on the side wall surface of the mounting table 422. A step hole adapted to the shape of the mounting table 422 is provided on the moving plate 420 to further reduce the risk of the mounting table 422 falling off and improve the structural stability.

[0080] In some embodiments, the fastening ring 425 may include two half rings, which are connected together by bolts. By adjusting the bolts, the fastening ring 425 is mounted on the mounting table 422.

[0081] The number of the connecting columns 431 is the same as the number of the compression springs 440, and a plurality of compression springs 440 are sleeved on the outer circumferences of the plurality of connecting columns 431 one by one.

[0082] In the solution of this embodiment, a compression spring 440 is sleeved on the outer circumference of each connecting column 431, which not only improves the force uniformity of the moving plate 420, but also ensures the reset effect of the mounting table 422. After the rotating shaft 200 stops rotating, under the pressing of the compression spring 440, the moving plate 420 approaches the static plate 410, the connecting rod moves away from the moving plate 420 and drives the mounting table 422 to rotate, so that the magnetic force between the first magnet 423 and the second magnet 412 changes from repulsion to attraction.

[0083] In some preferred embodiments, the connecting columns 431 and the compression springs 440 may be uniformly distributed circumferentially on the moving plate 420 to further improve the force uniformity of the moving plate 420 and ensure the reset effect of the moving plate 420 and the mounting table 422.

[0084] Combined with the above embodiments, the specific working process of the speed reducer with shaft-end dynamic seal provided by the present invention is described as follows:

[0085] The rotating shaft 200 starts to rotate, driving the substrate 430 to rotate. The substrate 430 drives the moving plate 420 to rotate through the connecting columns 431, and dynamic pressure is generated in the pressure groove on the moving plate 420, attracting the surrounding fluid to generate a fluid film. Under the push of the fluid film, the moving plate 420 moves axially away from the static plate 410, causing the mounting table 422 on the moving plate 420 to rotate. The first magnet 423 on the mounting table 422 rotates to repel the second magnet 412 on the static plate 410.

[0086] During the rotation of the rotating shaft 200, when the rotating shaft 200 deflects, the gap in the area in the same direction as the deflection direction of the rotating shaft 200 decreases, the pressure of the fluid film increases, the gap in the area in the opposite direction to the deflection direction of the rotating shaft 200 increases, and the pressure of the fluid film decreases. The static plate 410 receives a greater top thrust in the area in the same direction as the deflection direction of the rotating shaft 200, thereby pushing the rotating member 300 to rotate in the direction of the deflection of the rotating shaft 200, so that the axis of the rotating member 300 approaches the axis of the rotating shaft 200.

[0087] After the rotating shaft 200 stops rotating, the fluid film disappears, and the moving plate 420 approaches the stationary plate 410 under the pressing of the compression spring 440. At the same time, the mounting table 422 is driven to rotate in the opposite direction, so that the first magnet 423 on the mounting table 422 is reset, and the magnetic force between the first magnet 423 and the second magnet 412 changes from repulsion to attraction, causing the moving plate 420 and the stationary plate 410 to be closely attached.

[0088] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0089] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A reducer with a shaft end dynamic seal, characterized in that: include: A shell having symmetrical mounting holes formed on two sides thereof; A rotating shaft is arranged on the housing; one end of the rotating shaft is arranged in a mounting hole, and the other end passes through the symmetrical mounting holes and extends out of the housing; The rotating member is annular, sleeved on one end of the rotating shaft extending out of the housing, and located in the corresponding mounting hole; an annular spherical surface is formed on the side wall surface of the rotating member; a spiral sealing groove is formed in the area of ​​the rotating shaft corresponding to the rotating member; Two sealing assemblies are sleeved on the rotating shaft and are respectively located at the axial ends of the rotating member; each sealing assembly includes a static plate, a dynamic plate and a base plate sleeved on the rotating shaft, the static plate abuts against the rotating member; the dynamic plate is arranged between the static plate and the base plate; a plurality of spiral grooves are arranged at intervals on the end surface of the dynamic plate facing the static plate, and one end of the groove away from the axis of the dynamic plate passes through the side wall of the dynamic plate; a plurality of compression springs are arranged between the base plate and the dynamic plate; annular mounting grooves are respectively formed at both ends of the rotating member, and annular protrusions are formed on the end surface of the static plate facing the rotating member, and the protrusions are respectively embedded in the corresponding mounting grooves; During the rotation of the rotating shaft, the moving plate is configured to rotate under the drive of the rotating shaft, so that dynamic pressure is formed in the slot, and the surrounding fluid is attracted to form a fluid film between the moving plate and the static plate. The rotating member is configured to rotate around the center of the spherical surface under the push of the static plate. When the rotating shaft deviates, the gap between the moving plate and the static plate changes, and the static plate is used to push the rotating member to rotate in the direction of the deviation of the rotating shaft, so that the coaxiality of the rotating member and the rotating shaft is improved; After the rotating shaft stops rotating, the moving plate is pressed against the static plate by a plurality of compression springs; The base plate is fixedly connected to the rotating shaft, and a plurality of connecting columns are arranged at intervals on the end surface of the base plate facing the moving plate; the connecting columns are connected to the moving plate to drive the moving plate to rotate; a plurality of rotatable mounting platforms are arranged on the moving plate, and one end of the mounting platforms facing the static plate is flush with the end surface of the moving plate, and a first magnet is embedded in one end of each mounting platform facing the static plate; a plurality of second magnets are arranged on the static plate, and the plurality of second magnets correspond to the plurality of first magnets one by one; when the moving plate and the static plate are attached, the first magnets and the second magnets attract each other; When the moving plate moves away from the static plate, the mounting platform rotates to cause the first magnet and the second magnet to repel each other.

2. The reducer with shaft end dynamic seal according to claim 1, characterized in that: Also includes: A mounting seat is sleeved on the outer periphery of the rotating member, and an annular spherical groove is formed on the inner wall surface of the mounting seat to match the spherical curved surface of the rotating member; An annular mounting plate is respectively disposed at both ends of the mounting seat, and a plurality of fastening holes are arranged at intervals on the mounting plate; an annular end cover, fixedly mounted on the housing and sleeved on the outer periphery of the mounting seat; the annular end cover comprises an end plate mounted on the side wall of the housing, and a mounting tube extending from the end plate into the mounting hole; the mounting tube is correspondingly provided with an annular step surface adapted to the mounting plate; A plurality of fasteners are arranged corresponding to the plurality of fastening holes one by one; each of the fasteners passes through the corresponding fastening hole and is connected to the annular step surface.

3. The reducer with shaft end dynamic seal according to claim 2, characterized in that: At least one sealing strip is arranged between the mounting seat and the rotating member.

4. The reducer with shaft end dynamic seal according to claim 1, characterized in that: The size of the slot is proportional to the viscous resistance of the fluid surrounding it.

5. The reducer with shaft end dynamic seal according to claim 1, characterized in that: A threaded hole is provided at one end of the mounting platform facing the movable plate; an external thread matching the threaded hole is formed on the top of the connecting column, and a plurality of the connecting columns and a plurality of the threaded holes correspond one to one; When the moving plate is close to the static plate, the connecting column partially extends into the threaded hole; when the moving plate is away from the static plate, the connecting column penetrates into the threaded hole to rotate the mounting platform; wherein, After the connecting column is completely inserted into the threaded hole, the mounting platform is rotated 180° compared to the initial position.

6. The reducer with shaft end dynamic seal according to claim 5, characterized in that: The mounting platform extends the movable plate toward one end of the base plate, and a fastening ring is provided at the end of the mounting platform extending from the movable plate; the fastening ring is sleeved on the outer periphery of the mounting platform and abuts against the end surface of the movable plate.

7. The reducer with shaft end dynamic seal according to claim 5, characterized in that: The number of the connecting columns is consistent with the number of the compression springs, and the plurality of compression springs are sleeved on the outer circumferences of the plurality of connecting columns in a one-to-one correspondence.

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