Ball cage type synchronous universal coupling and sealing device thereof

Abstract

The ball cage type synchronous universal coupling comprises two coupling bodies which are symmetrically arranged, each coupling body comprises an outer sleeve, an inner sleeve and a retainer, limiting pieces are arranged at the two ends of each coupling body, each limiting piece comprises a steel wire baffle ring and a baffle, and the inner end of the inner cylindrical surface of each outer sleeve is provided with a circle of annular step. The baffles are fixed at the annular steps of the two jackets through fasteners; outer flanges are arranged at the inner ends of the outer cylindrical surfaces of the two jackets; the joint surfaces of the outer flanges at the inner ends of the two coupling bodies are hermetically connected through a sealing plate and a fastening assembly; the two sealing structures are used for connecting the outer ends of the coupling bodies in a sealing manner; the sealing structure comprises a sealing sleeve, a large gland and a small gland. The design of the upper flange and the lower flange of the sealing sleeve is utilized, the embedded structure of the sealing sleeve, the large gland, the small gland, the inner sleeve and the outer sleeve is adopted, the ball cage coupling is effectively sealed, the large gland and the small gland are ingeniously combined with the sealing sleeve, and the reliability of high-speed operation of the ball cage coupling is guaranteed.

Description

Technical Field

[0001] The present invention relates to a coupling, specifically a constant velocity universal coupling with a ball cage and its sealing device. Background Art

[0002] As a mechanical transmission device, couplings are widely used in industries such as construction machinery, metallurgy, mining, chemical engineering, and automobiles to connect two rotating elements that are not on the same axis and transmit power (mainly torque) and motion. When there is a certain degree of angular deviation and axial displacement between the two rotating elements of the equipment, the coupling can ensure the normal operation of the equipment. There are various types of couplings for direct connection to motors, such as diaphragm couplings, drum gear couplings, and ball cage couplings.

[0003] Diaphragm couplings do not require lubrication, sealing, and maintenance, but have high requirements for installation accuracy, no axial displacement compensation, and are easily damaged when installed with an out-of-tolerance.

[0004] Drum gear couplings have a compact structure, a small turning radius, and an angular deviation compensation of 1.5°, and are suitable for low-speed and heavy-load working conditions. Since the adjustment angular deviation of both the diaphragm coupling and the drum gear coupling is not more than 1.5°, the ability to compensate for axial displacement is limited. Especially, the installation of both is by precision reamed bolts, and the installation of precision reamed bolts has high requirements for accuracy. Generally, it is required that the two shafts of the connected parts are completely concentric. However, during operation, due to manufacturing and installation errors, bearing wear, force deformation, foundation settlement, etc., axis deviation is bound to occur, exceeding their usage requirements.

[0005] The angular deviation compensation of a ball cage coupling can reach 5°, has a certain axial displacement, is easy to align and install, and can transmit a large torque, but has certain requirements for the sealing device. For existing ball cage couplings, the sealing device is mostly a contact structure. When used at high speeds, it is easy for the grease to seep out or even be thrown out from the contact gap. In severe cases, the surrounding of the transmission components is covered with splashed grease, and the grease is mixed with dust and water vapor to pollute the environment. More seriously, this causes a lack of grease inside the ball cage coupling, insufficient lubrication or dry running, resulting in heat sintering and ultimately failure to work properly, as shown in Figure 1 . Figure 1In this case, the lip of the inner sleeve is in interference contact with the lip of the skeleton seal 1. When the constant velocity joint operates and deflects by a certain angle, irregular gaps often occur between the inner sleeve and the lip of the skeleton seal 1, resulting in the leakage of the grease. The O-ring 2 seals between the gland and the outer sleeve. When assembling the constant velocity joint, if the depth of the groove of the O-ring 2 or the dimensional accuracy and geometric tolerance of the gland are not well controlled, the O-ring 2 will be trimmed by the gland or fail to contact, etc., affecting the sealing effect. The spacer 3 seals between the two outer sleeves, and a good sealing effect cannot be formed between the steel parts. The above three situations directly lead to the leakage of the grease of the constant velocity joint, affecting the feasibility of the high-speed use of the constant velocity joint. For the existing fixed-end sealing device, at high speeds, due to the action of centrifugal force, the sealing sleeve expands, scratches and tears with the surrounding mechanical devices, or tears along the clamp, which will also cause the leakage of grease, thus leading to the lack of grease and the failure of heat sintering of the constant velocity joint. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a constant velocity joint of a ball cage type with a large compensation angle, axially displaceable, and good high-speed sealing performance, and its sealing device.

[0007] The technical solution of the present invention lies in: a constant velocity joint of a ball cage type, including two symmetrically arranged coupling bodies. Each coupling body includes an outer sleeve, an inner sleeve, and a cage. At both ends of the coupling body, there are limit members for moving and limiting the inner sleeve and the cage. The limit members include a wire snap ring at the outer end and a baffle at the inner end. At the inner end of the inner cylindrical surface of the two symmetrically arranged outer sleeves, a circular step is provided. The baffle is fixed to the circular steps of the two outer sleeves by fasteners. At the inner end of the outer cylindrical surface of the two symmetrically arranged outer sleeves, there are outer flanges. The outer flange joint surfaces at the inner ends of the two coupling bodies are sealed and connected through a sealing plate and a fastening assembly. It also includes two sealing structures for sealing and connecting the outer ends of each coupling body. The sealing structure includes a sealing sleeve. The sealing sleeve includes an outer sealing structure, an inner sealing structure, and an arc-shaped sealing section connected between the outer sealing structure and the inner sealing structure. The outer sealing structure includes a radially extending radial sealing section connected to the arc-shaped sealing section and an axially extending annular sealing section I connected to the radial sealing section. At the inner end of the inner circle of the annular sealing section I, there is an upper flange. The inner sealing structure includes an annular sealing section II connected to the arc-shaped sealing section. At the outer end of the outer circle of the annular sealing section II, there is a lower flange. An arc-shaped groove is formed between the annular sealing section II and the arc-shaped sealing section. The sealing structure also includes a large gland for pressing the outer sealing structure of the sealing sleeve against the outer sleeve, and a small gland for pressing the inner sealing structure of the sealing sleeve against the inner sleeve.

[0008] The large gland includes an annular cover plate corresponding to the first annular sealing section of the sealing sleeve, a radial cover plate corresponding to the radial sealing section of the sealing sleeve, and a cutting plate tangent to the arc surface of the arc-shaped sealing section of the sealing sleeve. The annular cover plate, the radial cover plate, and the cutting plate are connected in sequence. There are N riveting holes I evenly distributed on the annular cover plate. The small gland includes an annular plate. The outer end of the annular plate has a limiting surface extending radially. The inner end of the annular plate is rounded to form a round head. There are N riveting holes II evenly distributed in the middle of the annular plate. The inner ring of the annular plate is in a stepped shape formed by a large stepped part and a small stepped part. There is an inner ring groove between the small stepped part and the large stepped part. A ring groove II and a sealing step II are provided on the outer cylindrical surface of the outer sleeve near the outer end. The two side walls of the ring groove II are symmetrically inclined. A ring groove I and a sealing step I are provided on the outer cylindrical surface of the inner sleeve near the outer end. The two side walls of the ring groove I are symmetrically inclined. During assembly, the lower flange of the sealing sleeve is embedded in the inner ring groove of the small gland. The round head of the small gland is embedded in the arc-shaped groove of the sealing sleeve and is sleeved together on the sealing step I and the ring groove I of the inner sleeve. The small gland riveted to the ring groove I of the inner sleeve presses against the inner sealing structure of the sealing sleeve. The limiting surface on the small gland abuts against the outer end of the inner sleeve. The upper flange of the sealing sleeve is nested in the outer sealing step II of the outer sleeve. The large gland riveted to the ring groove II of the outer sleeve presses against the outer sealing structure of the sealing sleeve. The cutting plate on the large gland is tangent to the sealing sleeve to radially limit the sealing sleeve.

[0009] The riveting holes II of the small gland correspond to the ring groove I of the inner sleeve. A pointed chisel is used to rivet and turn the edge through the riveting holes II and embed it into the ring groove I of the inner sleeve to form a riveted fixation. The riveting holes I on the large gland correspond to the ring groove II of the outer sleeve. A pointed chisel is used to rivet and turn the edge through the riveting holes I of the large gland and embed it into the ring groove II of the outer sleeve for riveted fixation.

[0010] A partition is provided between the radial sealing section of the sealing sleeve and the outer sleeve.

[0011] The baffle is an annular plate. A counterbore for fitting with a fastener is provided near the outer circle of the annular plate. There is an axial mounting hole corresponding to the counterbore on the outer sleeve. The counterbore and the axial mounting hole form a complete mounting hole, and the fastener is installed at the mounting hole.

[0012] The depth of the annular step is greater than the depth of the baffle. The depth of the annular step and the depth of the baffle refer to Figure 2 as shown by the horizontal arrow in the figure. The inner hole of the baffle should be larger than the cylindrical surface of the inner sleeve to avoid interference during axial compression. The baffle ensures the inward (compression) movement limit of the inner sleeve and the cage. The inner hole and the step provided on the baffle are to avoid interference with the movement of the inner sleeve and the cage.

[0013] The fastening assembly includes a bolt, a nut, and a spring washer.

[0014] N external grooves are provided on the outer spherical surface of the inner sleeve, which are equally distributed along the circumference and parallel to the axis. The number of the external grooves is equal to and corresponds to that of the internal grooves of the outer sleeve. The inner hole of the inner sleeve is provided with a flat key or a spline. The cage is arranged between the inner cylindrical surface of the outer sleeve and the outer spherical surface of the inner sleeve. N steel balls are press-fitted into the window holes of the cage and are simultaneously placed into the N internal grooves on the inner surface of the outer sleeve and the N external grooves on the outer spherical surface of the inner sleeve.

[0015] When the thickness of the small gland > 1.5 mm, the riveting hole II is a counterbore structure, and the thickness of the small hole part of the riveting hole II ≤ 1.5 mm; when the thickness of the large gland > 1.5 mm, the riveting hole I is a counterbore structure, and the thickness of the small hole part of the riveting hole I ≤ 1.5 mm; when the thickness of the small gland ≤ 1.5 mm, the riveting hole II is a through-hole structure, and the thickness of the riveting hole II = the thickness of the small gland; when the thickness of the large gland ≤ 1.5 mm, the riveting hole I is a through-hole structure, and the thickness of the riveting hole I = the thickness of the large gland.

[0016] A sealing device for a constant velocity universal joint of the ball cage type, comprising a sealing sleeve; the sealing sleeve includes an outer sealing structure, an inner sealing structure, and an arc-shaped sealing section connected between the outer sealing structure and the inner sealing structure; the outer sealing structure includes a radially extending radial sealing section connected to the arc-shaped sealing section, and an axially extending annular sealing section I connected to the radial sealing section, and there is an upper flange at the inner end of the inner circle of the annular sealing section I; the inner sealing structure includes an annular sealing section II connected to the arc-shaped sealing section, and there is a lower flange at the outer end of the outer circle of the annular sealing section II; an arc-shaped groove is formed between the annular sealing section II and the arc-shaped sealing section; the sealing structure further includes a large gland for pressing the outer sealing structure of the sealing sleeve against the outer sleeve, and a small gland for pressing the inner sealing structure of the sealing sleeve against the inner sleeve; the large gland includes an annular cover plate corresponding to the annular sealing section I of the sealing sleeve, a radial cover plate corresponding to the radial sealing section of the sealing sleeve, and a cutting plate tangent to the arc surface of the arc-shaped sealing section of the sealing sleeve, and the annular cover plate, the radial cover plate, and the cutting plate are connected in sequence; there are N riveting holes I evenly distributed on the annular cover plate; the small gland includes an annular plate, there is a limiting surface extending radially at the outer end of the annular plate, the inner end of the annular plate is rounded to form a round head, there are N riveting holes II evenly distributed in the middle of the annular plate, the inner circle of the annular plate is in a stepped shape formed by a large stepped portion and a small stepped portion, and there is an inner annular groove between the small stepped portion and the large stepped portion; an annular groove II and a sealing step II are provided on the outer cylindrical surface of the outer sleeve near the outer end, and the two side walls of the annular groove II are symmetrically inclined; an annular groove I and a sealing step I are provided on the outer cylindrical surface of the inner sleeve near the outer end, and the two side walls of the annular groove I are symmetrically inclined; during assembly, the lower flange of the sealing sleeve is embedded into the inner annular groove of the small gland; the round head of the small gland is embedded into the arc-shaped groove of the sealing sleeve, and they are sleeved together on the sealing step I and the annular groove I of the inner sleeve, and the small gland riveted to the annular groove I of the inner sleeve presses against the inner sealing structure of the sealing sleeve, and the limiting surface on the small gland abuts against the outer end of the inner sleeve; the upper flange of the sealing sleeve is nested in the sealing step II of the outer sleeve, and the large gland riveted to the annular groove II of the outer sleeve presses against the outer sealing structure of the sealing sleeve, and the cutting plate on the large gland is tangent to the sealing sleeve to limit the sealing sleeve radially.

[0017] The present invention utilizes the design of the upper and lower flanges of the sealing sleeve, adopts the embedded structure of the sealing sleeve, the large and small glands, and the inner and outer sleeves to effectively seal the ball cage coupling. The ingenious combination of the large and small glands and the sealing sleeve ensures the reliability of the high-speed operation of the ball cage coupling. This structure meets the use requirements of the ball cage coupling with large torque and high speed, expands the use field of the ball cage coupling, and increases the market share of the ball cage coupling. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the prior art structure; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a schematic diagram of the structure of the inner sleeve; Figure 4is Figure 3 Partial sectional view taken along line B-B; Figure 5 is a schematic structural view of the outer sleeve; Figure 6 is Figure 5 Partial sectional view taken along line A-A; Figure 7 is a schematic structural view of the small gland; Figure 8 is Figure 7 sectional view; Figure 9 is a schematic structural view of the large gland; Figure 10 is Figure 9 sectional view; Figure 11 is a schematic structural view of the sealing sleeve; Figure 12 is a perspective view of the sealing sleeve; Figure 13 is a schematic view of the second flanging of the riveting hole of the large gland; Figure 1 In, 1. Skeleton seal, 2. O-ring, 3. Spacer sleeve; Figures 2 - 13 In, 4. Inner sleeve, 4-1. First annular groove, 4-2. First sealing step, 5. Outer sleeve, 5-1. Second annular groove, 5-2. Second sealing step, 6. Cage, 7. Baffle, 8. Bolt, 9. Nut, 10. Spring washer, 11. Sealing plate, 12. Steel ball, 13. Wire snap ring, 14. Large gland, 14-1. First riveting hole, 14-2. Cutting plate, 15. Sealing sleeve, 15-1. Lower flange, 15-2. Arc-shaped groove, 15-3. Upper flange, 15-4. Arc-shaped sealing section, 16. Partition plate, 17. Small gland, 17-1. Second riveting hole, 17-2. Limiting surface, 17-3. Inner annular groove, 17-4. Round head, 18. Fastener. Specific embodiments

[0019] Figure 2 In, the present invention is composed of an inner sleeve 4, an outer sleeve 5, a cage 6, a baffle 7, a bolt 8, a nut 9, a spring washer, a sealing plate 11, a steel ball 12, a wire snap ring 13, a large gland 14, a sealing sleeve 15, a partition plate 16, a small gland 17 and a fastener 18.

[0020] There are N outer grooves evenly distributed along the circumference on the outer spherical surface of the inner sleeve 4. The outer grooves are parallel to the axis, equal in number and corresponding to the inner grooves of the outer sleeve 5. The inner hole of the inner sleeve 4 is set as a flat key or a spline, or other required connection methods. The cage 6 is arranged between the inner cylindrical surface of the outer sleeve 5 and the outer spherical surface of the inner sleeve 4. N steel balls 12 are press-fitted into the window holes of the cage 6 and are simultaneously placed into the N inner grooves on the inner surface of the outer sleeve 5 and the N outer grooves on the outer spherical surface of the inner sleeve 4.

[0021] There are two outer sleeves 5, inner sleeves 4, and cages 6, which are symmetrically arranged. Inside the inner cylindrical surface in the middle of the symmetrically arranged outer sleeves 5, a baffle 7 is provided respectively. The baffle 7 is fixed to the left and right outer sleeves by fasteners 18 respectively, and is used to limit the inward (compression) movement of the inner sleeve 4 and the cage 6; a wire retaining ring 13 is arranged at the outer end of the inner cylindrical surface of the outer sleeve 5, and is used to limit the outward (tensile) movement of the inner sleeve 4 and the cage 6. The large end of the sealing sleeve 15 is arranged on the outer cylindrical surface of the outer sleeve 5 through a partition 16 and is fixed by pressing and riveting with a large gland 14; the small end of the sealing sleeve is fixed by pressing and riveting with a small gland 17. A sealing plate 11 is provided between the outer flanges of the two symmetrically arranged outer sleeves 5 to seal the joint surface, and is fastened by bolts 8, nuts 9, and spring washers 10.

[0022] Figure 3 、 4 In, on the outer cylindrical surface at one end of the inner sleeve 4, a first ring groove 4-1 and a first sealing step 4-2 are provided. The two side walls of the first ring groove 4-1 are symmetrically inclined at a certain angle to form a dovetail groove, and the inclination angle ≤ 5°.

[0023] Figure 5 、 6 In, on the outer cylindrical surface at one end of the outer sleeve 5, a second ring groove 5-1 and a second sealing step 5-2 are provided. The two side walls of the second ring groove 5-1 are symmetrically inclined at a certain angle to form a dovetail groove, and the inclination angle ≤ 5°.

[0024] Figure 7 、 8 In, on the small gland 17, N evenly distributed second riveting holes 17-1, a limiting surface 17-2, an inner ring groove 17-3, and a round head 17-4 are provided. The second riveting holes 17-1 are countersunk structures, and the thickness of the small hole part of the second riveting holes 17-1 ≤ 1.5 mm.

[0025] Figure 9 、 10 In, on the large gland 14, N evenly distributed first riveting holes 14-1 and a cutting plate 14-2 are provided. The first riveting holes 14-1 are countersunk structures, and the thickness of the small hole part of the first riveting holes 14-1 ≤ 1.5 mm.

[0026] Figure 11 、 12In it, a lower flange 15-1, an arc-shaped groove 15-2, an upper flange 15-3, and an arc-shaped sealing section 15-4 are provided on the sealing sleeve 15.

[0027] Figure 13 During assembly, the lower flange 15-1 of the sealing sleeve 15 is embedded in the inner ring groove 17-3 of the small gland 17; the round head 17-4 of the small gland 17 is embedded in the arc-shaped groove 15-2 of the sealing sleeve 15, and they are sleeved together at the first sealing step 4-2 and the first ring groove 4-1 of the inner sleeve 4, and are pressed tightly. The limiting surface 17-2 on the small gland 17 is used for limiting. The second riveting hole 17-1 on the small gland 17 corresponds to the first ring groove 4-1 of the inner sleeve 4. A pointed chisel is used to rivet and flanging through the second riveting hole 17-1 and embed it into the first ring groove 4-1 of the inner sleeve 4. The two symmetrically inclined side walls of the first ring groove 4-1 and the riveting flanging form a locking amount to lock and fix the small gland; the upper flange 15-3 of the sealing sleeve 15 is nested in the second sealing step 5-2 of the outer sleeve 5, and the large gland 14 is pressed tightly. The first riveting hole 14-1 on the large gland 14 corresponds to the second ring groove 5-1 of the outer sleeve 5. A pointed chisel is used to rivet and flanging through the first riveting hole 14-1 of the large gland 14 and embed it into the second ring groove 5-1 of the outer sleeve 5. The two symmetrically inclined side walls of the second ring groove 5-1 and the riveting flanging form a locking amount to lock and fix the large gland. The cutting plate 14-2 on the large gland 14 is tangent to the sealing sleeve 15 to radially limit the sealing sleeve 15.

[0028] The above-mentioned structure ensures the long-term effective dust-proof and grease-sealing effect of the sealing sleeve 15 of the constant velocity joint during high-speed rotation.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A ball cage type synchronous universal coupling, characterized in that: The invention comprises two symmetrically arranged coupling bodies, each coupling body comprising an outer sleeve (5), an inner sleeve (4), and a retaining frame (6). Two ends of the coupling body are provided with limiting members for limiting the movement of the inner sleeve (4) and the retaining frame (6), the limiting members comprising a wire retaining ring (13) located at the outer end and a baffle (7) located at the inner end. An annular step is provided at the inner end of the inner cylindrical surface of the two symmetrically arranged outer sleeves (5). The baffle (7) is fixed to the annular step of the two outer sleeves by a fastener (18). The inner ends of the outer cylindrical surfaces of the two symmetrically arranged outer sleeves (5) are provided with an outer flange. The outer flange joint surfaces of the inner ends of the two coupling bodies are sealed and connected via a sealing plate (11) and a fastening assembly. The invention also comprises two sealing structures for sealingly connecting the outer ends of the coupling bodies. The sealing structure comprises a sealing sleeve (15). The sealing sleeve (15) comprises an outer sealing structure, an inner sealing structure, and an arcuate sealing section (15-4) connected between the outer sealing structure and the inner sealing structure; the outer sealing structure comprises a radial sealing section extending radially and connected to the arcuate sealing section (15-4), and an annular sealing section 1 extending axially and connected to the radial sealing section, wherein the inner end of the inner ring of the annular sealing section 1 has an upper flange (15-3); the inner sealing structure comprises an annular sealing section 2 connected to the arcuate sealing section (15-4), wherein the outer end of the outer ring of the annular sealing section 2 has a lower flange (15-1); an arcuate groove (15-2) is formed between the annular sealing section 2 and the arcuate sealing section (15-4); The sealing structure further comprises a large gland (14) for pressing the outer sealing structure of the sealing sleeve (15) onto the outer sleeve (5), and a small gland (17) for pressing the inner sealing structure of the sealing sleeve (15) onto the inner sleeve (4); During assembly, the lower flange (15-1) of the sealing sleeve (15) is embedded in the inner annular groove (17-3) of the small pressure cover (17); the round head (17-4) of the small pressure cover (17) is embedded in the arc groove (15-2) of the sealing sleeve (15), and the small pressure cover (17) is inserted into the sealing step 1 (4-2) and the annular groove 1 (4-1) of the inner sleeve (4) together. The small pressure cover (17) riveted to the annular groove 1 (4-1) of the inner sleeve (4) is pressed against the inner sealing of the sealing sleeve (15). The structure comprises a limiting surface (17-2) on the small gland (17) abutting against the outer end of the inner sleeve (4); a flange (15-3) on the sealing sleeve (15) is nested in the second sealing step (5-2) of the outer sleeve (5), and a large gland (14) riveted to the second ring groove (5-1) of the outer sleeve (5) is pressed against the outer sealing structure of the sealing sleeve (15); a cutting plate (14-2) on the large gland (14) is tangent to the sealing sleeve (15) to limit the radial position of the sealing sleeve (15).

2. The ball cage type synchronous universal coupling according to claim 1, characterized in that: The large gland (14) comprises an annular cover plate corresponding to the annular sealing section 1 of the sealing sleeve (15), a radial cover plate corresponding to the radial sealing section of the sealing sleeve (15), and a cutting plate (14-2) tangent to the arc surface of the arc-shaped sealing section (15-4) of the sealing sleeve (15); the annular cover plate, the radial cover plate, and the cutting plate (14-2) are connected in sequence; and N riveting holes 1 (14-1) are evenly distributed on the annular cover plate; The small gland (17) comprises an annular plate, the outer end of the annular plate has a limiting surface (17-2) extending radially, the inner end of the annular plate is rounded to form a round head (17-4), the middle of the annular plate has N evenly distributed riveting holes (17-1), the inner ring of the annular plate is in a step shape formed by a large step portion and a small step portion, and an inner ring groove (17-3) is provided between the small step portion and the large step portion; A second annular groove (5-1) and a second sealing step (5-2) are provided on the outer cylindrical surface of the outer sleeve (5) near the outer end, and the two side walls of the second annular groove (5-1) are symmetrically inclined; An outer cylindrical surface of the inner sleeve (4) close to the outer end is provided with an annular groove (4-1) and a sealing step (4-2), and two side walls of the annular groove (4-1) are symmetrically inclined.

3. The ball cage type synchronous universal coupling according to claim 2, characterized in that: The second rivet hole (17-1) of the small pressure cover (17) corresponds to the first annular groove (4-1) of the inner sleeve (4), and a sharp chisel is used to insert the rivet flange of the second rivet hole (17-1) into the first annular groove (4-1) of the inner sleeve (4) to form a riveted fixation; the first rivet hole (14-1) on the large pressure cover (14) corresponds to the second annular groove (5-1) of the outer sleeve (5), and a sharp chisel is used to insert the rivet flange of the first rivet hole (14-1) of the large pressure cover (14) into the second annular groove (5-1) of the outer sleeve (5) to form a riveted fixation.

4. The ball cage type synchronous universal coupling according to claim 1, characterized in that: A partition plate (16) is provided between the radial sealing section of the sealing sleeve (15) and the outer sleeve (5).

5. The ball cage type synchronous universal coupling according to claim 1, characterized in that: The baffle (7) is an annular plate, and a countersunk hole for fitting with the fastener (18) is provided near the outer ring of the annular plate. An axial mounting hole corresponding to the countersunk hole is provided on the outer sleeve (5). The countersunk hole and the axial mounting hole form a complete mounting hole, and the fastener (18) is installed at the mounting hole.

6. The ball cage type synchronous universal coupling according to claim 1, characterized in that: The depth of the annular step is greater than the depth of the baffle (7); and the inner hole of the baffle (7) is larger than the cylindrical surface of the inner sleeve (4).

7. The ball cage type synchronous universal coupling according to claim 1, characterized in that: The fastening assembly comprises a bolt (8), a nut (9), and a spring washer (10).

8. The ball cage type synchronous universal coupling according to claim 1, characterized in that: The outer spherical surface of the inner sleeve (4) is provided with N outer grooves distributed at equal distances along the circumference, the outer grooves are parallel to the axis, and the number of the outer grooves is equal to and corresponds to the inner grooves of the outer sleeve (5), the inner hole of the inner sleeve (4) is provided with a flat key or a spline, the retaining frame (6) is provided between the inner cylindrical surface of the outer sleeve (5) and the outer spherical surface of the inner sleeve (4), and the N steel balls (12) are interference-fitted into the window holes of the retaining frame (6) and are simultaneously placed in the N inner grooves on the inner surface of the outer sleeve (5) and the N outer grooves on the outer spherical surface of the inner sleeve (4).

9. The ball cage type synchronous universal coupling according to claim 1, characterized in that: When the thickness of the small pressure cover (17) is greater than 1.5 mm, the rivet hole 2 (17-1) is a countersunk hole structure, and the thickness of the small hole portion of the rivet hole 2 (17-1) is ≤1.5 mm; when the thickness of the large pressure cover (14) is greater than 1.5 mm, the rivet hole 1 (14-1) is a countersunk hole structure, and the thickness of the small hole portion of the rivet hole 1 (14-1) is ≤1.5 mm; when the thickness of the small pressure cover (17) is ≤1.5 mm, the rivet hole 2 (17-1) is a through hole structure, and the thickness of the rivet hole 2 (17-1) is equal to the thickness of the small pressure cover (17); when the thickness of the large pressure cover (14) is ≤1.5 mm, the rivet hole 1 (14-1) is a through hole structure, and the thickness of the rivet hole 1 (14-1) is equal to the thickness of the large pressure cover (14).

10. A sealing device for a ball cage type synchronous universal coupling, characterized in that: including a sealing sleeve (15); The sealing sleeve (15) comprises an outer sealing structure, an inner sealing structure, and an arcuate sealing section (15-4) connected between the outer sealing structure and the inner sealing structure; the outer sealing structure comprises a radial sealing section extending radially and connected to the arcuate sealing section (15-4), and an annular sealing section 1 extending axially and connected to the radial sealing section, wherein the inner end of the inner ring of the annular sealing section 1 has an upper flange (15-3); the inner sealing structure comprises an annular sealing section 2 connected to the arcuate sealing section (15-4), wherein the outer end of the outer ring of the annular sealing section 2 has a lower flange (15-1); an arcuate groove (15-2) is formed between the annular sealing section 2 and the arcuate sealing section (15-4); The sealing structure further comprises a large gland (14) for pressing the outer sealing structure of the sealing sleeve (15) onto the outer sleeve (5), and a small gland (17) for pressing the inner sealing structure of the sealing sleeve (15) onto the inner sleeve (4); The large gland (14) comprises an annular cover plate corresponding to the annular sealing section 1 of the sealing sleeve (15), a radial cover plate corresponding to the radial sealing section of the sealing sleeve (15), and a cutting plate (14-2) tangent to the arc surface of the arc-shaped sealing section (15-4) of the sealing sleeve (15); the annular cover plate, the radial cover plate, and the cutting plate (14-2) are connected in sequence; and N riveting holes 1 (14-1) are evenly distributed on the annular cover plate; The small gland (17) comprises an annular plate, the outer end of the annular plate has a limiting surface (17-2) extending radially, the inner end of the annular plate is rounded to form a round head (17-4), the middle of the annular plate has N evenly distributed riveting holes (17-1), the inner ring of the annular plate is in a step shape formed by a large step portion and a small step portion, and an inner ring groove (17-3) is provided between the small step portion and the large step portion; A second annular groove (5-1) and a second sealing step (5-2) are provided on the outer cylindrical surface of the outer sleeve (5) near the outer end, and the two side walls of the second annular groove (5-1) are symmetrically inclined; An outer cylindrical surface of the inner sleeve (4) near the outer end is provided with an annular groove (4-1) and a sealing step (4-2), and the two side walls of the annular groove (4-1) are symmetrically inclined; During assembly, the lower flange (15-1) of the sealing sleeve (15) is embedded in the inner annular groove (17-3) of the small pressure cover (17); the round head (17-4) of the small pressure cover (17) is embedded in the arc groove (15-2) of the sealing sleeve (15), and the small pressure cover (17) is inserted into the sealing step 1 (4-2) and the annular groove 1 (4-1) of the inner sleeve (4) together. The small pressure cover (17) riveted to the annular groove 1 (4-1) of the inner sleeve (4) is pressed against the inner sealing of the sealing sleeve (15). The structure comprises a limiting surface (17-2) on the small gland (17) abutting against the outer end of the inner sleeve (4); a flange (15-3) on the sealing sleeve (15) is nested in the second sealing step (5-2) of the outer sleeve (5), and a large gland (14) riveted to the second ring groove (5-1) of the outer sleeve (5) is pressed against the outer sealing structure of the sealing sleeve (15); a cutting plate (14-2) on the large gland (14) is tangent to the sealing sleeve (15) to limit the radial position of the sealing sleeve (15).

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