Axial force isolation device

Abstract

The present disclosure provides an axial force isolation device. The axial force isolation device includes a first shaft and a first end cover, a first bearing, an inner retaining ring, a second bearing and a radial protrusion arranged in sequence along the direction from the first end to the second end of the first shaft, and the radial protrusion radially protrudes from the first shaft. The first bearing, the inner retaining ring and the second bearing are fixedly positioned between the first end cover and the radial protrusion by a fastening element threadedly connected to the first end of the first shaft, so that the axial force borne by the first shaft is transmitted to the first end cover through the radial protrusion, the second bearing, the inner retaining ring and the first bearing in sequence. The axial force isolation device of the present disclosure also includes an adjustment mechanism that can eliminate the axial clearance between the first bearing and the second bearing.

Description

Technical Field

[0001] The present application relates to an axial force isolation device, in particular to an axial force isolation device applied to a rotary welding machine. Further, the present application relates to an axial force isolation device applied to a rotary welding machine capable of adjusting the axial clearance of a bearing. Background Art

[0002] A spin welding machine is a machine used to weld plastic parts together by melting them through friction. The working process of the spin welding machine is to apply pressure on the contact surface of two plastic parts while driving one of the plastic parts to rotate through a rotating motor and a coaxial reducer that may be used, so that the two plastic parts rotate relative to each other under the applied pressure, so that the contact surface of the two plastic parts generates a lot of heat through friction, melting the contact parts of the two plastic parts, and then stop rotating, cool for a certain period of time while maintaining pressure, and finally complete the welding of the two plastic parts.

[0003] As can be seen from the above, the plastic parts need not only a relatively high rotation speed, but also a relatively high pressure. Usually, the rotation speed is about 3000RPM, and the pressure between the plastic parts to be welded reaches more than 3000N. However, the motor shaft of the existing rotating motor or the reducer shaft of the standard coaxial reducer - the motor shaft and the reducer shaft are collectively referred to as the output shaft below - cannot meet the requirements of bearing a large axial load, such as an axial load of 3000N at a rated speed, such as a rotation speed of 3000RPM.

[0004] Therefore, it is necessary to provide an axial force isolation device to isolate the axial load generated by the pressure between the plastic parts from the output shaft so that the output shaft does not bear the axial force to ensure the normal operation of the motor or reducer.

[0005] In the related art, there is a rotating mechanism in a dual servo rotary friction welding machine, which uses a thrust ball bearing to isolate the axial force. However, according to the thrust ball bearing usage specification, the thrust ball bearing cannot bear radial loads and has a low limit speed. When the thrust ball bearing operates under high-speed conditions, the contact angle between the steel ball and the radial plane of the raceway will be affected by the centrifugal force, causing the steel ball to slide relative to the raceway. The adhesive wear caused by this sliding will damage the thrust ball bearing. To prevent this damage, it is necessary to ensure that the thrust ball bearing bears the minimum load. In the application of the rotary welding machine, the speed reaches 3000RPM, and the axial force reaches more than 3000N, which will directly cause the wear of the thrust ball bearing and sharply reduce the life of the thrust ball bearing.

[0006] In addition, the axial force isolation device in the related technology is subjected to high speed and large axial force for a long time, which causes a large axial gap between the bearings, resulting in a decrease in the axial position accuracy of the welding machine, making it difficult to control the welding depth of the welding product, affecting the quality of the welding product; in more serious cases, the axial force may be directly transmitted to the output shaft, causing the motor or reducer to be damaged due to the axial force.

[0007] It should be noted that this background technology section is intended to illustrate the technical background of the present application and is not intended to limit the scope of the present application. Summary of the invention

[0008] The purpose of the present application is to provide an axial force isolation device, which can isolate the axial load generated during the operation of a rotary welding machine so that it cannot be transmitted to the output shaft of a motor or a reducer.

[0009] Another object of the present application is to provide an axial force isolation device, which can adjust the axial clearance of the bearing of the axial force isolation device, thereby ensuring the axial positioning accuracy of the welding machine.

[0010] On one hand, the present application provides an axial force isolation device, which can meet the working environment of high speed (3000RPM-4500RPM) and high axial force (4500N-5000N), and the axial force isolation device includes:

[0011] a first shaft, which is rotatably disposed in the axial force isolation device and bears the axial force during operation; and

[0012] Sequentially arranged along the direction from the first end of the first axis to the second end of the first axis:

[0013] a first end cover, wherein the first shaft passes through a central hole of the first end cover in a manner capable of rotating relative to the first end cover;

[0014] a first bearing, wherein the first bearing is disposed on the first shaft, and an outer ring of a first end of the first bearing abuts against the first end cover;

[0015] An inner retaining ring, a first end of which abuts against a second end of the inner ring of the first bearing;

[0016] a second bearing, the second bearing being disposed on the first shaft, the first end of the inner ring of the second bearing abutting against the second end of the inner retaining ring; and

[0017] a radial protrusion, the radial protrusion radially protruding from the first shaft and abutting against a second end of an inner ring of the second bearing;

[0018] The first bearing, the inner retaining ring and the second bearing are fixedly positioned between the first end cover and the radial protrusion by a fastening element threadedly connected to the first end of the first shaft, so that the axial force borne by the first shaft is transmitted to the first end cover through the radial protrusion, the second bearing, the inner retaining ring and the first bearing in sequence.

[0019] According to the above structure disclosed in the present invention, the axial force borne on the first shaft can be guided to the first end cover through the radial protrusion, the second bearing, the inner retaining ring, the first bearing, and the first end cover in this order. Finally, the axial force is applied to the first end cover that can withstand the axial force, and will not be applied to the output shaft of the motor or the reducer.

[0020] Furthermore, the axial force isolation device of the present disclosure further includes:

[0021] a first outer retaining ring, the first outer retaining ring being fixed to the first end cover at the outer side of the first bearing and abutting against the second end of the outer ring of the first bearing;

[0022] a second outer retaining ring, wherein two ends of the second outer retaining ring are respectively in contact with a first end of an outer ring of the second bearing and the first outer retaining ring; and

[0023] The outer shell is arranged on the outer sides of the first outer retaining ring and the second outer retaining ring and is fixedly connected to the first end cover.

[0024] Furthermore, the axial force isolation device also includes:

[0025] a second end cover, the second end cover being disposed on a second side of the first shaft and fixedly connected to the housing;

[0026] The first end cover, the outer shell and the second end cover enclose a hollow cavity, the first shaft passes through the hollow cavity, and the fastening element, the first bearing, the inner retaining ring, the first outer retaining ring, the second outer retaining ring, the second bearing and the radial protrusion are all located in the hollow cavity.

[0027] According to the axial force isolation device disclosed in the present invention, the first end of the first shaft is provided with a center hole and a keyway for key-connecting the output shaft of the motor or the reducer to the first shaft, and the first end cover can be fixedly fitted to the casing of the motor or the reducer, thereby isolating the axial force transmitted to the output shaft of the motor or the reducer by further transmitting the axial force to the casing of the motor or the reducer.

[0028] The axial force isolation device according to the present disclosure further includes an adjustment mechanism, which is capable of adjusting the axial distance between the first outer retaining ring and the second outer retaining ring, thereby eliminating the axial clearance between the first bearing and the second bearing.

[0029] Wherein, the regulating mechanism comprises:

[0030] A radial groove, the radial groove is arranged on the end surface of at least one of the first outer retaining ring and the second outer retaining ring that is opposite to each other, and the radial groove has a bottom surface that gradually becomes shallower from the outside to the inside;

[0031] an adjusting block, the adjusting block being arranged between the first outer retaining ring and the second outer retaining ring and being located in the radial groove, and the adjusting block and the radial groove are complementary in shape;

[0032] The adjusting element is arranged on the radial outside of the adjusting block and is used to push the adjusting block to move radially. The radial movement of the adjusting block from the outside to the center pushes the first outer retaining ring and the second outer retaining ring to move axially away from each other.

[0033] In particular, a plurality of pairs of radial grooves are circumferentially arranged on the end faces of the first outer retaining ring and the second outer retaining ring, respectively. The positions of the radial grooves on the first outer retaining ring and the second outer retaining ring correspond to each other one by one, forming a plurality of wedge-shaped hollow grooves, and the adjustment block is correspondingly formed into a wedge-shaped adjustment block.

[0034] Specifically, the adjusting element is an adjusting screw, the adjusting screw is threadedly matched with a threaded through hole provided on the housing, and the end of the adjusting screw passes through the housing and abuts against the radial outer side surface of the adjusting block.

[0035] Further, the threaded through hole is formed as a stepped hole, and the stepped portion of the stepped hole is used to limit the screwing depth of the adjusting screw.

[0036] According to the axial force isolation device disclosed herein, a first sealing ring is provided between the first end cover and the first shaft, and a second sealing ring is provided between the second end cover and the first shaft; in particular, a second sealing ring is provided only between the second end cover and the first shaft.

[0037] In particular, the radial protrusion is a shoulder extending integrally from the first shaft in the radial direction; or, the radial protrusion may be a retaining ring cooperating with the first shaft.

[0038] Preferably, the first bearing and the second bearing are angular contact ball bearings or deep groove ball bearings.

[0039] In addition, the axial length of the center hole and the axial length of the keyway are respectively greater than the overhanging axial length of the output shaft of the motor or reducer and the axial length of the key, so that the first shaft connected by the key can move slightly in the axial direction relative to the output shaft, further isolating the axial force.

[0040] Furthermore, the first end cover is provided with a connection stop structure to axially align the first end cover with the housing of the motor or reducer when the first end cover is matched. Specifically, the connection stop structure is a sunken circular step portion provided on the end surface of the first end cover, which is used to match with the boss corresponding to the housing of the motor or reducer.

[0041] The technical features and effects of the present disclosure will be described in detail below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a three-dimensional schematic diagram of a vertical rotary welding machine according to the present disclosure;

[0043] Figure 2 is a partial perspective schematic diagram of a spin welding machine with a mold assembly according to the present disclosure;

[0044] Figure 3a and Figure 3b is an exploded perspective schematic diagram of a lifting main body assembly of a rotary welding machine according to the present disclosure observed from two directions;

[0045] Figure 4a and Figure 4b is an exploded three-dimensional schematic diagram of a pressure head lifting assembly of a rotary welding machine according to the present disclosure observed from two directions;

[0046] Figure 5 is a cross-sectional view of a rotating assembly and an axial force isolation device of a rotary welding machine according to the present disclosure;

[0047] Figure 6a and Figure 6b is a three-dimensional schematic diagram of the first outer retaining ring of the axial force isolation device according to the present disclosure observed from two directions;

[0048] Figure 7 is a three-dimensional schematic diagram of a second outer retaining ring of the axial force isolation device according to the present disclosure;

[0049] Figure 8a is a three-dimensional schematic diagram of an adjustment block of an axial force isolation device according to the present disclosure;

[0050] Figure 8b and 8c is a side schematic diagram of an adjustment block of an axial force isolation device according to the present disclosure;

[0051] Fig. 9 is a schematic plan view of a first end cover of an axial force isolation device according to the present disclosure. DETAILED DESCRIPTION

[0052] Spin welding machines can be used to weld workpieces such as plastics or metals that can be melted under high pressure and friction and formed into one piece after cooling; at the same time, according to the different pressure directions, they can also be divided into vertical spin welding machines and horizontal spin welding machines. Figure 1-9 , taking a vertical plastic rotary welding machine as an example, an implementation scheme of the present application is introduced: a vertical plastic rotary welding machine with an axial force isolation device.

[0053] See attached Figure 1 and 2 , which shows a rotary welding machine 10 according to the first embodiment of the present disclosure. A mold assembly 20 can be installed on the rotary welding machine 10, and a plastic workpiece 30 to be welded can be fixed on the mold assembly 20. Among them, the rotary welding machine 10 includes: a base 100, which is used to support the rotary welding machine 10 as a whole; a frame 200, the lower end of which is fixedly mounted on the base 100 and extends in a direction perpendicular to the base 100, so that the entire rotary welding machine 10 can be extended in this direction, providing sufficient operating space for the installation of the mold assembly 20; a lifting assembly 300, which is mounted on the frame 200, so that the pressure head assembly 400 installed on the lifting assembly 300 can move on the frame 200, providing a suitable initial height for the mold assembly 20; The ram assembly 400 is installed on the lifting assembly 300, and can enable the rotating assembly 500 installed on the ram assembly 400 to move up and down relative to the ram assembly 400, thereby providing the required pressure for the plastic workpiece 30; the rotating assembly 500 is installed on the ram assembly 400, thereby providing the required rotational force for the plastic workpiece 30; and an axial force isolation device 600, which is installed at the output end of the rotating assembly 500, for transmitting the rotational force provided by the rotating assembly 500 to the mold assembly 20, and isolating the axial force fed back by the mold assembly 20 for the output shaft of the rotating assembly 500.

[0054] See attached Figure 2 The mold assembly includes an upper mold 21 and a lower mold 22; the plastic workpiece 30 includes an upper workpiece 31 and a lower workpiece 32. A work table 101 is provided on the machine base 100, and the lower mold 22 can be installed on the work table 101, and the lower mold 22 is used to fix the lower workpiece 32. The upper mold 21 can be installed at the lower end of the axial force isolation device 600, and the upper mold 21 is used to fix the upper workpiece 31.

[0055] See attached Figure 3a , 3bThe lifting assembly 300 includes a lifting body 301, a lifting body motor 302, a lifting body screw rod 303, a lifting body nut 304, a lifting body guide rail 305 and a lifting body slider 306. The lifting body motor 302 is fixed to the upper end of the frame 200 and drives the lifting body screw rod 303 to rotate. The lifting body screw rod 303 and the lifting body guide rail 305 are fixed to the frame 200 and extend along the direction in which the frame 200 extends. The lifting body nut 304 is threadedly connected to the lifting body screw rod 303 to convert the rotation of the lifting body screw rod 303 into the linear motion of the lifting body nut 304. At the same time, the lifting body nut 304 is fixedly connected to the lifting body 301 by bolts, so the lifting body nut 304 also drives the lifting body 301 to move linearly. The lifting body slider 306 is fixed to the lifting body 301 and is slidably connected to the lifting body guide rail 305, so that the linear motion of the lifting body 301 is supported and positioned by the lifting body guide rail 305. Finally, as the lifting body motor 302 rotates, the lifting body 301 moves linearly up and down along the lifting body guide rail 305 to provide the required working height of the mold assembly 20.

[0056] It is conceivable that the lifting body screw rod 303 and the lifting body nut 304 cooperate to realize the lifting function, and can also be replaced by a combination of a cylinder and a fixed block. In which, the cylinder is installed on the frame 200, and the fixed block is installed on the cylinder head and fixedly connected to the lifting body 301 to realize the movement of the lifting body 301 in a linear direction.

[0057] See attached Figure 4a , 4bThe pressure head assembly 400 is fixedly mounted on the lifting body 301 of the lifting assembly 300, and includes a pressure head lifting bracket 401, a pressure head lifting motor 402, a pressure head screw 403, a pressure head guide rail 405 and a pressure head slider 406. Among them, the pressure head lifting bracket 401 is fixed to the lifting body 301, for example, by screws. The pressure head lifting motor 402 is fixed to the upper end of the pressure head lifting bracket 401, and drives the pressure head screw 403 installed on the pressure head lifting bracket 401 to rotate. The pressure head guide rail 405 is fixed to the pressure head lifting bracket 401 and extends along the direction in which the frame 200 extends. The screw nut 504 of the rotating assembly 500 is threadedly connected to the pressure head screw 403 and is integrally formed with the motor mounting bracket 507 of the rotating assembly 500. It can be imagined by ordinary technicians in this field that the screw nut 504 can also be fixed on the motor mounting bracket 507. The screw nut 504 converts the rotation of the pressure head screw 403 into the linear motion of the pressure head nut 504, and the pressure head nut 504 drives the motor mounting frame 507 to move linearly. The pressure head slider 406 is fixed on the motor mounting frame 507 and is slidably connected with the pressure head guide rail 405, so that the linear motion of the motor mounting frame 507 is supported and positioned by the pressure head guide rail 405. Finally, as the pressure head lifting servo motor 402 rotates, the motor mounting frame 507 of the rotating assembly 500 moves linearly along the pressure head guide rail 405 to provide the pressure required for welding.

[0058] It is conceivable that the pressure head screw 403 and the screw nut 504 cooperate to realize the lifting function, and can also be replaced by a combination of a cylinder and a fixed block. The cylinder is installed on the pressure head lifting bracket 401, and the fixed block is installed on the cylinder head and fixedly connected to the motor mounting bracket 507 to realize the movement of the motor mounting bracket 507 in a linear direction.

[0059] It is understandable that in another embodiment, the lifting assembly 300 may not be provided, so that the pressure head assembly 400 may not be fixed on the lifting assembly 300, but may be directly fixed on the frame 200, but in this case the vertical position of the pressure head assembly cannot be adjusted.

[0060] See attached Figure 4a and Figure 5 In addition to the motor mounting frame 507 and the pressure head nut 504, the rotating assembly 500 also includes a motor 501 for outputting a rotating force, wherein a motor housing 502 of the motor 501 is fixed on the motor mounting frame 507, and a motor shaft 503 of the motor 501 is arranged parallel to the frame 200. Preferably, the rotating assembly 500 also includes a speed reducer connected to the motor 501, for reducing the output speed of the rotating assembly 500.

[0061] It is understandable that if the rotating assembly 500 can provide sufficient axial pressure while providing the rotational force, the pressure head assembly 400 may not be provided.

[0062] The axial force isolation device 600 is installed on the rotating assembly 500 to ensure that the axial force will not be transmitted to the motor shaft or the reducer shaft 503. The axial force isolation device 600 includes a first shaft 601, and the first shaft 601 is provided with an input end center hole and a keyway 601a at the upper end. The motor shaft 503 is key-connected with the first shaft 601 through the input end center hole and the keyway 601a to achieve rotation together. Alternatively, the rotating motor 501 can be connected to the reducer first, and then the reducer shaft is connected to the first shaft 601. The lower end of the first shaft 601 is provided with an output end keyway 601b, and the upper mold 21 can be fixedly connected to the first shaft 601 in the rotation direction through the output end keyway 601b, and the upper workpiece 31 can be fixed on the upper mold 21. Finally, the rotational force output by the rotating motor 501 is transmitted to the upper workpiece 31, so that the upper workpiece 31 rotates relative to the lower workpiece 32, providing the friction required for welding. The first end cover 602 for bearing the axial force is fixedly connected to the motor housing 502, and the first end cover 602 is provided with a central hole for the first shaft 601 to pass through. The housing 603 is arranged approximately along the outer edge of the first end cover 602 in the circumferential direction, and is fixedly connected to the first end cover 602 by screws to form a hollow cavity. The second end cover 604 is arranged on the side of the housing 603 opposite to the first end cover 602, and is fixedly connected to the housing 603 by screws to close the hollow cavity, and the second end cover 604 is provided with a central hole for the first shaft 601 to pass through.

[0063] In this way, the first shaft 601 may be disposed to pass through the first end cap 602 and the second end cap 604 and the hollow cavity.

[0064] In addition, the axial force isolation device 600 further includes the following components which are sequentially sleeved on the first shaft 601 and located inside the hollow cavity: a first bearing 605, the first end of the outer ring of the first bearing 605 abuts the first end cover 602; an inner retaining ring 606, the first end of the inner retaining ring 606 abuts the second end of the inner ring of the first bearing 605; and a second bearing 607, the second end of the inner retaining ring 606 abuts the first end of the inner ring of the second bearing 607. A radial protrusion 608 is also formed on the first shaft 601, the radial protrusion 608 radially protrudes from the first shaft 601, and the radial protrusion 608 abuts the second end of the inner ring of the second bearing 607.

[0065] More specifically, the radial protrusion 608 is a shoulder extending radially from the first shaft 601. The first bearing 605, the inner retaining ring 606 and the second bearing 607 are fastened to the first shaft against the radial protrusion 608 by a fastening element 609 threadedly connected to one end of the first shaft 601. The fastening element 609 provides an axial preload for the inner ring of the first bearing 605 and the inner ring of the second bearing 607. It is easy to imagine that the radial protrusion 608 can also be set as a split retaining ring or other components.

[0066] Due to the structure of the above-mentioned axial force isolation device 600 disclosed in the present invention, when the rotary welding machine 10 is working, the axial force applied to the first shaft 601 through the upper mold 21 is transmitted to the first end cover 602 through the radial protrusion 608, the second bearing 607, the inner retaining ring 606, and the first bearing 605 in sequence, thereby preventing the axial force from being transmitted to the output shaft 503 of the motor or the reducer, thereby achieving the technical effect of isolating the axial force.

[0067] It should be noted that from Figure 5 It can be seen that the first end cover 602 only contacts the outer ring of the first bearing 605 but not the inner ring. Therefore, the axial force applied to the inner rings of the first bearing 605 and the second bearing 607 is transmitted to their outer rings and finally to the first end cover 602 to achieve isolation. Therefore, the first bearing 605 and the second bearing 607 will be subjected to a force that causes their inner rings and outer rings to be offset from each other during operation. Over time, an axial gap that causes mutual offset will be formed between the inner ring and the outer ring of the bearing, affecting the positioning accuracy of the first shaft.

[0068] like Figure 5 , Figure 6a and Figure 6b As shown, the axial force isolation device 600 further includes: a first outer retaining ring 610, which has an inner surface 617 matched with the outer side of the first bearing 605 and a step portion 618 abutting against the second end of the first bearing 605. Specifically, the first outer retaining ring abuts against the second end of the outer ring of the first bearing, and the first outer retaining ring is fixed to the first end cover 602, and in particular, it is fixed here by screws that fix the first end cover 602 and the housing 603. As a result, the two ends of the inner ring of the first bearing 605 are respectively positioned by the fastening element 609 and the inner retaining ring 606; and the outer ring of the first bearing 605 is respectively positioned by the first end cover 602 and the first outer retaining ring 610, so that the first bearing 605 is fixedly installed on the first shaft 601.

[0069] like Figure 6a and Figure 6bAs shown, the first outer retaining ring 610 is further provided with a skirt 610a, and the skirt 610a is provided with a mounting hole 610b for fixing the first outer retaining ring 610 between the first end cover 602 and the housing 603, so that the first outer retaining ring 610 becomes a fixing part.

[0070] like Figure 5 and Figure 7 As shown, the axial force isolation device 600 further includes a second outer retaining ring 611, one end of which abuts against a first end of an outer ring of the second bearing 607, and the other end of which abuts against the first outer retaining ring 610. Similarly, the second bearing 607 is positioned by the inner retaining ring 606, the second outer retaining ring 611, the radial protrusion 608 and the housing 603.

[0071] In order to adjust the bearing clearance between the first bearing 605 and the second bearing 607, the axial force isolation device 600 further includes an adjustment mechanism, which can adjust the axial distance between the first outer retaining ring 610 and the second outer retaining ring 611. Figure 6a , Figure 6b and Figure 7 As shown, the adjustment mechanism includes: a radial groove 612, which extends radially on the contact end faces of the first outer retaining ring 610 and the second outer retaining ring 611, and is preferably arranged in multiple numbers along the circumferential direction, and the radial groove 612 has a side surface parallel to the radial straight line of the first axis 601 and a bottom surface that gradually becomes shallower from the outside to the inside.

[0072] An adjustment block 613 is fitted into the radial groove 612. Figures 8a to 8c As shown, the shape of the adjustment block 613 is complementary to the shape of the radial groove 612, and is formed into a wedge shape in one direction. Specifically, the upper and lower surfaces are formed into inclined surfaces that match the bottom surface of the radial groove 612, the left and right surfaces are formed into parallel side surfaces that match the side surfaces of the radial groove 612, and the front and rear surfaces are formed into arc surfaces consistent with the outer retaining ring.

[0073] The adjusting screw 614 passes through the threaded through hole of the housing 603 and abuts against the radial outer side of the adjusting block 613, and the adjusting screw 614 is threadedly connected to the threaded through hole of the housing 603. Rotating the adjusting screw 614 can make it move in the radial direction, and at the same time push the adjusting block 613 to move in the radial direction. Since the adjusting block 613 is formed in a wedge shape, the adjusting block 613 applies an axial force to the first outer retaining ring 610 and the second outer retaining ring 611 while moving in the radial direction, so that the first outer retaining ring 610 and the second outer retaining ring 611 generate an axial displacement away from each other, so as to adjust the distance between the first outer retaining ring 610 and the second outer retaining ring 611.

[0074] According to the above design, the distance between the first outer retaining ring 610 and the second outer retaining ring 611 can be increased by screwing in the adjusting screw 614, thereby increasing the distance between the outer ring of the first bearing 605 and the outer ring of the second bearing 607. At the same time, when the fastening element 609 has fixed the inner ring of the first bearing 605 and the inner ring of the second bearing 607, the bearing clearances of the first bearing 605 and the second bearing 607 can be simply and effectively adjusted.

[0075] In addition, the above design also adds a transmission path for the axial force, that is, the axial force is transmitted from the radial protrusion 608 to the first end cover 602 via the second bearing 607, the second outer retaining ring 611, the first outer retaining ring 610, and the first bearing 605. It is conceivable that if only the axial force is transmitted, the first outer retaining ring 610 and the second outer retaining ring 611 can also appear in the form of an integral component.

[0076] Preferably, a first sealing ring 615 is provided between the first shaft 601 and the first end cover 602, and a second sealing ring 616 is provided between the first shaft 601 and the second end cover 604, so that the hollow cavity is sealed, which can not only prevent external dust and the like from entering the hollow cavity, but also help to preserve the lubricating substance inside the hollow cavity, thereby increasing the service life of the internal parts of the hollow cavity.

[0077] Preferably, the threaded through hole of the housing 602 that cooperates with the adjusting screw 614 is formed as a stepped hole, and the stepped portion of the stepped hole is used to limit the screwing depth of the adjusting screw 614 and prevent the adjusting screw 614 from being screwed in too much.

[0078] Preferably, the first bearing 605 and the second bearing 607 are angular contact ball bearings to withstand greater axial forces; if the axial force borne on the first shaft 601 is smaller, deep groove ball bearings may also be used.

[0079] Preferably, a floating design is adopted between the first shaft 601 and the motor shaft 503 or the reducer shaft, that is, the axial lengths of the center hole and the keyway 601a are respectively greater than the overhanging axial length of the motor shaft 503 or the reducer shaft and the length of the key, thereby leaving a certain margin in the axial direction so that the two can move relative to each other in the axial direction, thereby preventing damage to the motor or reducer box due to axial movement of the first shaft 601.

[0080] It is easy to imagine that the first outer retaining ring 610 can also be fixed on the second end cover 604 or the housing 603. In addition, those skilled in the art can also fix the second outer retaining ring 611 on the first end cover 602 or the second end cover 604 or the housing 603 instead of fixing the first outer retaining ring 610, and fix the first outer retaining ring 610 through the limiting effect of the adjustment block 613 in the circumferential direction, so as to achieve the fixation of the outer ring of the first bearing 605 and the outer ring of the second bearing 607.

[0081] In the above embodiment, the adjustment block is a wedge-shaped configuration with two side surfaces being inclined surfaces. However, the configuration of the adjustment block 613 has greater flexibility. For example, only one side surface being formed as an inclined surface can also achieve the effect of the present invention. Accordingly, only one side of the first outer retaining ring 610 or the second outer retaining ring 611 is provided with a radial groove 612 that matches with the first outer retaining ring 610 or the second outer retaining ring 611.

[0082] According to the above embodiment, the outer sides of the outer rings of the first bearing 605 and the second bearing 607 can be pressed against the first outer retaining ring 610 or the second outer retaining ring 611 or the housing 603 according to actual conditions, so that the outer rings of the first bearing 605 and the second bearing 607 are well fixed.

[0083] See attached Fig. 9 The first end cover 602 is provided with a connecting threaded hole 602a and a connecting stop structure 602b. The first end cover 602 is fixed to the motor housing 502 or the reducer housing through the connecting threaded hole 602a. The connecting stop structure 602b is set as a circular step portion sunken from the end surface of the first end cover 602, which is used to cooperate with the corresponding boss of the motor housing 502 to ensure the correct axial alignment of the first end cover 602 and the motor housing 502, thereby further ensuring the axial alignment of the first shaft 601 and the motor shaft 503, and preventing the axial and radial components of force on the motor shaft 503 due to axial misalignment.

[0084] Since the motor housing 502 and the first end cover 602 are fixed by a connecting stop structure, the first sealing ring 615 is not required to be arranged between the first shaft 601 and the first end cover 602. That is, only the second sealing ring 616 is arranged between the first shaft 601 and the second end cover 604, and satisfactory sealing can be achieved.

[0085] The present application discloses an embodiment and mentions some possible alternatives, all of which are within the protection scope of the present application. In addition, some obvious modifications that a person of ordinary skill in the art will recognize will also fall within the protection scope of the present application.

Claims

1. An axial force isolation device, comprising: a first shaft, which is rotatably disposed in the axial force isolation device and bears the axial force during operation; as well as Sequentially arranged along the direction from the first end of the first axis to the second end of the first axis: a first end cover, wherein the first shaft passes through a central hole of the first end cover in a manner capable of rotating relative to the first end cover; a first bearing, wherein the first bearing is disposed on the first shaft, and a first end of an outer ring of the first bearing abuts against the first end cover; An inner retaining ring, a first end of which abuts against a second end of the inner ring of the first bearing; a second bearing, the second bearing being disposed on the first shaft, the first end of the inner ring of the second bearing abutting against the second end of the inner retaining ring; and a radial protrusion, the radial protrusion radially protruding from the first shaft and abutting against a second end of an inner ring of the second bearing; The first bearing, the inner retaining ring and the second bearing are fixedly positioned between the first end cover and the radial protrusion by a fastening element connected to the first end of the first shaft, so that the axial force borne by the first shaft is transmitted to the first end cover through the radial protrusion, the second bearing, the inner retaining ring and the first bearing in sequence; Wherein, the axial force isolation device further comprises: a first outer retaining ring, the first outer retaining ring being fixed to the first end cover at the outer side of the first bearing and abutting against the second end of the outer ring of the first bearing; a second outer retaining ring, wherein two ends of the second outer retaining ring are respectively in contact with a first end of an outer ring of the second bearing and the first outer retaining ring; and A shell is arranged on the outside of the first outer retaining ring and the second outer retaining ring and is fixedly connected to the first end cover.

2. The axial force isolation device according to claim 1, characterized in that: The axial force isolation device also includes: a second end cover, the second end cover being disposed on a second side of the first shaft and fixedly connected to the housing; The first end cover, the outer shell and the second end cover enclose a hollow cavity, the first shaft passes through the hollow cavity, and the fastening element, the first bearing, the inner retaining ring, the first outer retaining ring, the second outer retaining ring, the second bearing and the radial protrusion are all located in the hollow cavity.

3. The axial force isolation device according to claim 2, characterized in that The invention also includes an adjusting mechanism, which can adjust the axial distance between the first outer retaining ring and the second outer retaining ring to eliminate the axial clearance between the first bearing and the second bearing.

4. The axial force isolation device according to claim 3, characterized in that: The regulating mechanism comprises: A radial groove, the radial groove is arranged on the end surface of at least one of the first outer retaining ring and the second outer retaining ring that is opposite to each other, and the radial groove has a bottom surface that gradually becomes shallower from the outside to the inside; an adjusting block, the adjusting block being arranged between the first outer retaining ring and the second outer retaining ring and being located in the radial groove, and the adjusting block and the radial groove are complementary in shape; The adjusting element is arranged on the radial outside of the adjusting block and is used to push the adjusting block to move radially. The radial movement of the adjusting block from the outside to the center pushes the first outer retaining ring and the second outer retaining ring to move axially away from each other.

5. The axial force isolation device according to any one of claims 1 to 2, characterized in that: The first end of the first shaft is provided with a center hole and a keyway for key-connecting the output shaft of the motor or the reducer to the first shaft, and the first end cover can be fixedly fitted to the housing of the motor or the reducer, thereby isolating the axial force transmitted to the output shaft of the motor or the reducer by further transmitting the axial force to the housing of the motor or the reducer.

6. The axial force isolation device according to claim 4, characterized in that: A plurality of pairs of radial grooves are respectively arranged on the end faces of the first outer retaining ring and the second outer retaining ring along the circumferential direction, and the positions of the radial grooves on the first outer retaining ring and the second outer retaining ring correspond to each other one by one to form a plurality of wedge-shaped hollow grooves, and the adjustment block is correspondingly formed into a wedge-shaped adjustment block.

7. The axial force isolation device according to claim 4, characterized in that: The adjusting element is an adjusting screw, which is threadedly matched with a threaded through hole arranged on the housing, and a tip of the adjusting screw passes through the housing and abuts against a radial outer side surface of the adjusting block.

8. The axial force isolation device according to claim 7, characterized in that: The threaded through hole is formed as a stepped hole, and a stepped portion of the stepped hole is used to limit a screwing depth of the adjusting screw.

9. The axial force isolation device according to claim 2, characterized in that: A sealing ring is provided between the second end cover and the first shaft.

10. The axial force isolation device according to any one of claims 1 to 2, characterized in that: The radial protrusion is a shoulder extending integrally from the first shaft in the radial direction or a retaining ring matched with the first shaft.

11. The axial force isolation device according to any one of claims 1 to 2, characterized in that: The first bearing and the second bearing are angular contact ball bearings or deep groove ball bearings.

12. The axial force isolation device according to claim 5, characterized in that: The axial length of the center hole and the axial length of the keyway are respectively greater than the axial length of the output shaft extending outward from the motor or reducer and the axial length of the key, so that the first shaft connected by the key can move slightly in the axial direction relative to the output shaft, further isolating the axial force.

13. The axial force isolation device according to claim 5, characterized in that: The first end cover is provided with a connection stop structure to axially align the first end cover with the housing of the motor or the reducer when the first end cover is matched.

14. The axial force isolation device according to claim 13, characterized in that: The connection stop structure is a sunken circular step portion arranged on the end surface of the first end cover, which is used to cooperate with a boss corresponding to the housing of the motor or the reducer.

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