Ball cage type synchronous universal coupling and body thereof

Abstract

The ball cage type synchronous universal coupling body is composed of an outer sleeve, a retainer, steel balls and an inner sleeve, the retainer is arranged between the inner spherical surface of the outer sleeve and the outer spherical surface of the inner sleeve, N window holes are formed in the retainer in the circumferential direction, and the N steel balls are embedded into the window holes of the retainer in a win-win mode. The N inner grooves are formed in the inner surface of the outer sleeve, and the N outer grooves are formed in the outer spherical surface of the inner sleeve; the inner spherical surface of the outer sleeve is concentric with the outer spherical surface of the retainer; the outer spherical surface of the inner sleeve is concentric with the inner spherical surface of the retainer; the outer sleeve inner spherical surface of the outer sleeve is in clearance fit with the retainer outer spherical surface, and the retainer rotates around the center of the retainer outer spherical surface by an angle; a cylindrical surface is arranged at the end part of the retainer inner ring; the outer spherical surface of the inner sleeve is in clearance fit with the inner spherical surface of the retainer, the inner sleeve rotates around the symmetric center O of the window hole by an angle, and the rotation angle of the retainer is 1 / 2 of that of the inner sleeve. The device has a fixed centering function, and the axial length is controllable, so that the requirements of different working conditions are met.

Description

Technical Field

[0001] The invention relates to a coupling, in particular to a ball cage type synchronous universal coupling and a body thereof. Background Art

[0002] As a mechanical transmission device, couplings are widely used in engineering machinery, metallurgy, mining, chemical industry, automobile and other industries to connect two rotating elements that are not on the same axis to transmit power (mainly torque) and motion. Couplings can ensure the normal operation of equipment when the two rotating elements of the equipment have a certain degree of angular deviation and axial displacement. The ball cage type synchronous universal coupling (hereinafter referred to as the ball cage coupling) is a type of coupling and is widely used. The traditional straight groove ball cage coupling has an eccentric structure in the inner and outer spherical surfaces of the cage. This structure is also called a double offset ball cage coupling or a double compensation ball cage coupling. The steel balls rotate, roll or slide on the linear grooves on the inner surface of the outer sleeve and the outer surface of the inner sleeve to achieve rotation and telescopic effects, transmit torque, and compensate for the angle changes and axial movements of the two shafts caused by working and installation errors. The double offset ball cage coupling is widely used in metallurgy, mining, petroleum and other industries due to its large angle compensation and wide torque transmission range.

[0003] As a component, the ball cage coupling is used in complex working conditions composed of multiple components such as large-scale petroleum machinery and metallurgical equipment production lines. The input shaft and the output shaft are mostly not coaxial and on different surfaces, and the length and angle in the X, Y, and Z directions may vary. Due to the manufacturing errors of each component, after assembly, the length determined in the design theory will be very different from the length actually used on site. This change in spatial length caused by manufacturing and installation cannot be accurately measured. When the spatial length does not correspond to the spatial length of the ball cage coupling, the double offset ball cage coupling is assembled by the clamp ring 5 in the integrated inner sleeve 1, retainer 1, steel ball 1 and shaft 1. When used, the steel ball 1 will always be against the retaining ring or gland due to transition stretching; when there is a height difference, due to the deadweight, the high end of the inner sleeve 1, retainer 1, steel ball 1 and shaft 1 assembled by the clamp ring 5 will slide to the low end when used, and the high end steel ball 3 will always be against the retaining ring 1 or gland. In both cases, when the ball cage coupling is in use, the steel ball 3 always rests on the retaining ring 1 and the gland, and the retaining ring 1 or the gland is always subjected to the axial impact of the steel ball 3. Under this continuous impact, the retaining ring F (or the gland) will fall out, break, and eventually fail, causing the inner sleeve 1, the retaining frame 1, and the steel ball 1 to fall out of the outer sleeve 1, and the ball cage coupling will fail. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a ball cage type synchronous universal coupling and a body thereof which are fixed and have a centering function without a retaining ring F and have a controllable axial length, so as to meet the requirements of different working conditions.

[0005] The technical scheme of the present invention is: a ball cage type synchronous universal coupling body, which is composed of an outer sleeve, a retainer, steel balls and an inner sleeve, wherein the retainer is arranged between the outer sleeve inner spherical surface of the outer sleeve and the outer spherical surface of the inner sleeve, and the retainer is provided with N window holes along the circumferential direction, and the N steel balls are interference fit into the window holes of the retainer, and are simultaneously placed in the N inner grooves on the inner surface of the outer sleeve and the N outer grooves on the outer spherical surface of the inner sleeve; the outer sleeve inner spherical surface of the outer sleeve is concentric with the spherical center of the outer spherical surface of the retainer; the outer sleeve outer spherical surface of the outer sleeve is concentric with the spherical center of the inner spherical surface of the retainer; the outer sleeve inner spherical surface of the outer sleeve is clearance matched with the outer spherical surface of the retainer, and the retainer rotates around the center of the outer spherical surface of the retainer; a cylindrical surface is arranged at the end of the inner ring of the retainer; the outer spherical surface of the inner sleeve is clearance matched with the inner spherical surface of the retainer, and the inner sleeve rotates around the symmetry center O of the window hole at an angle, and the rotation angle of the retainer is 1 / 2 of the rotation angle of the inner sleeve; A loading and unloading groove is arranged at the mouth of the outer sleeve, and the inner surface of the outer sleeve is composed of an inner cylindrical surface of the outer sleeve and an inner spherical surface of the outer sleeve. N inner channels are arranged in the outer sleeve at equal distances along the circumference, and the length direction of the inner channels is parallel to the axis of the outer sleeve; a channel wall is formed between any two adjacent inner channels, and the surface of the inner channel wall is composed of an inner cylindrical surface segment of the outer sleeve and an inner spherical surface segment of the outer sleeve connected to the inner cylindrical surface segment of the outer sleeve, and the limiting surface segment is located outside the inner spherical surface segment of the outer sleeve, and the inner cylindrical surface segments of the outer sleeve on the surfaces of each channel wall are arranged in a circle to form an inner cylindrical surface of the outer sleeve, and the inner spherical surface segments of the outer sleeve on the surfaces of each channel wall are arranged in a circle to form an inner spherical surface of the outer sleeve.

[0006] Two opposite ends of the channel walls are each provided with a groove for installing and removing the retainer to form a pair of loading and unloading grooves, and the distance between the pair of loading and unloading grooves is greater than the height between two opposite points on the outer spherical surface of the retainer on the retainer shaft section.

[0007] The outer sleeve is provided with a limiting surface, and the end of each channel wall has a limiting surface segment, and the limiting surface segments at the end of each channel wall are arranged in a circle to form a limiting surface. The outer sleeve is chamfered to form a limiting surface, and the chamfer angle is 20 to 40 degrees. When the shaft rotates to fit the limiting surface of the outer sleeve, it is limited by the limiting surface. If the shaft and the outer sleeve are not in contact when rotated to the required size, it can be limited by the gland at the end of the outer sleeve.

[0008] N evenly distributed mounting holes are arranged on the end face of the outer sleeve, one mounting hole corresponds to one channel wall, and K circumferential teeth are arranged on the outer circumference of the outer sleeve; N is an integer ≥6, and the number of circumferential teeth K is an integral multiple of N.

[0009] The outer spherical surface of the inner sleeve is provided with N outer grooves distributed at equal distances along the circumference, the length direction of the outer grooves is parallel to the axis of the inner sleeve, and the inner hole of the inner sleeve is provided with a spline or a flat key.

[0010] The outer surface of the cage is the outer spherical surface of the cage, and the center of the outer spherical surface of the cage is B. The inner surface of the cage is the inner spherical surface of the cage, and the center of the inner spherical surface of the cage is A. The outer spherical surface of the cage and the inner spherical surface of the cage are coaxial but not concentric. The center of the inner spherical surface of the cage is offset to the left by a distance e relative to the symmetry center O of the cage window hole, and the center of the outer spherical surface of the cage is offset to the right by a distance e relative to the symmetry center O of the cage window hole.

[0011] The diameter of the cylindrical surface is 0.2 to 0.5 mm larger than the diameter of the inner spherical surface of the cage.

[0012] The installation steps are as follows: ① Align the cage, the N outer spherical surfaces of the inner sleeve are aligned with the N window holes of the cage, the N grooves of the inner sleeve are aligned with the N inner spherical surfaces of the cage, and the inner sleeve is installed from the cylindrical end of the cage; ② The outer sleeve 7 is straightened, and the retainer and the inner sleeve are vertically loaded from the loading and unloading groove; ③ The inner spherical surface of the outer sleeve and the outer spherical surface of the cage, the inner spherical surface of the cage and the outer spherical surface of the inner sleeve are in place; ④ Rotate the inner sleeve and drive the cage at the same time, and install the steel balls in sequence; ⑤Inspection, installation completed; The disassembly steps are reversed as above.

[0013] A ball cage type synchronous universal coupling comprises a shaft, both ends of which are installed into the ball cage type synchronous universal coupling body through clamping rings.

[0014] A ball cage type synchronous universal coupling, characterized in that it includes a shaft, one end of the shaft is installed into the above-mentioned ball cage type synchronous universal coupling body through a clamping ring, and the other end of the shaft is equipped with a universal joint, or the other end of the shaft is equipped with a straight groove ball cage coupling through a clamping ring, and the straight groove ball cage coupling is provided with a retaining ring F.

[0015] In the existing ball cage coupling, the retainer, inner sleeve and steel ball slide randomly axially inside the outer sleeve. The sliding amount and sliding position are related to the installation conditions, and the specific positions of the retainer, inner sleeve and steel ball inside the outer sleeve are uncertain. In the ball cage type synchronous universal coupling of the present invention, the retainer and the outer sleeve are spherically matched, and the retainer, inner sleeve and steel ball are fixed in position inside the outer sleeve and cannot slide axially. The specific positions of the retainer, inner sleeve and steel ball inside the outer sleeve are determined. The present invention changes the traditional thinking mode and realizes the fixed structural mode of the double offset ball cage through design innovation, spherical matching constraints of the outer sleeve and retainer, matching constraints of the spherical surface of the retainer and the inner sleeve, and matching constraints of the grooves, which meets the use requirements of the ball cage coupling under specific working conditions such as large torque, expands the use field of the ball cage coupling, and increases the market share of the ball cage coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the prior art structure; Figure 2 It is a schematic diagram of the jacket structure of the prior art; Figure 3 It is a schematic diagram of the structure of the cage in the prior art; Figure 4 It is a front view of the main body of the present invention; Figure 5 It is a left side view of the main body of the present invention; Figure 6 Schematic diagram of the jacket structure; Figure 7 is a schematic diagram of the cage structure; Figure 8 The structure of the present invention is shown in FIG. Figure 1 ; Fig. 9 The structure of the present invention is shown in FIG. Figure 2 ; Figure 1 In the middle, 1, outer sleeve, 2, retainer, 3, steel ball, 4, inner sleeve, 5, clamping ring, 6, shaft, F, retaining ring; In the figure, 7, outer sleeve, 8, retainer, 9, steel ball, 10, inner sleeve, 11, spline or flat key, 12, inner cylindrical surface of outer sleeve, 13, inner spherical surface of outer sleeve, 14, limit surface, 15, loading and unloading groove, 16, mounting hole, 17, peripheral tooth, 18, outer spherical surface of retainer, 19, inner spherical surface of retainer, 20, window hole, 21, cylindrical surface, 22, retaining ring, 23, shaft, e, eccentricity, A, center of outer spherical surface of inner sleeve 10 (i.e. center of inner spherical surface 19 of retainer), B, center of inner spherical surface of outer sleeve 7 (i.e. center of outer spherical surface 18 of retainer), O, symmetry center of window hole 20. DETAILED DESCRIPTION

[0017] Figure 1-3In the figure, the existing straight groove type ball cage coupling is composed of an outer sleeve 1, a retainer 2, a steel ball 3, an inner sleeve 4, a clamping ring 5, a shaft 6, and a retaining ring F. The inner surface of the outer sleeve 1 is composed of an inner cylindrical surface E and a groove G. The center A of the inner spherical surface of the retainer 2 is offset to the left relative to the symmetric center O of the retainer window hole, and the center B of the outer spherical surface of the retainer 2 is offset to the right relative to the symmetric center O of the retainer window hole. When in use, the inner sleeve 1, the retainer 2 and the steel ball 3 are mounted on the shaft 6 and fixed in pairs by the clamping ring 5. They can freely slide axially in the groove G of the outer sleeve 1. The position after sliding and the installation angle and length on site vary randomly. If there is a height difference on site or the spatial length cannot be accurately measured or there is an installation error, due to the effect of gravity, the high end of the inner sleeve 1, the retainer 1, the steel ball 1 and the shaft 1 assembled in one body by the clamping ring 5 will slide to the low end, and the steel ball 3 will hit the retaining ring F (or the gland). When the retaining ring F breaks or the gland falls off, the inner sleeve 4, the retainer 2 and the steel ball 3 will fall out of the outer sleeve 1, and the ball cage coupling will fail.

[0018] Figure 4 , 5 In the present invention, the main body is composed of an outer sleeve 7, a retainer 8, steel balls 9 and an inner sleeve 10. The outer spherical surface of the inner sleeve 10 is provided with N outer grooves equidistantly distributed along the circumference, which are parallel to the axis and are equal in number and corresponding to the inner grooves of the outer sleeve 7. The inner hole of the inner sleeve 10 is provided with a spline 11 or a flat key, or other required connection methods. The retainer 8 is provided between the inner spherical surface 13 of the outer sleeve 7 and the outer spherical surface of the inner sleeve 10. N steel balls 9 are embedded in the window holes 20 of the retainer 8 through the winch, and are simultaneously placed in the N inner grooves on the inner surface of the outer sleeve 7 and the N outer grooves on the outer spherical surface of the inner sleeve 10.

[0019] The inner spherical surface 13 of the outer sleeve 7 is concentric with the outer spherical surface 18 of the cage, which is point B; the outer spherical surface of the inner sleeve 10 is concentric with the inner spherical surface 19 of the cage, which is point A. The inner spherical surface 13 of the outer sleeve 7 is clearance-matched with the outer spherical surface 18 of the cage, and the cage 8 rotates around the center of the outer spherical surface 18 of the cage; the outer spherical surface of the inner sleeve 10 is clearance-matched with the inner spherical surface 19 of the cage, and the inner sleeve 10 rotates around the symmetric center O of the window hole, and the rotation angle of the cage 8 is 1 / 2 of the rotation angle of the inner sleeve 10.

[0020] Figure 6In the embodiment, the inner surface of the outer sleeve 7 is composed of the inner cylindrical surface 12 and the inner spherical surface 13 of the outer sleeve. The inner surface of the outer sleeve 7 is provided with N inner grooves distributed at equal distances along the circumference, and the inner grooves are parallel to the axis, and N is an integer ≥ 6; the outer sleeve 7 is provided with N mounting holes 16, which correspond to the inner cylindrical surface 12 and the inner spherical surface 13 of the outer sleeve and are evenly distributed; the outer circumference of the outer sleeve 7 is provided with K peripheral teeth 17, and the number K of peripheral teeth 17 is an integral multiple of N; the width and depth of the peripheral teeth 17 are determined by checking the equal strength theory. The mouth of the outer sleeve 7 is provided with a limiting surface 14 to limit the rotation angle of the ball cage coupling; the mouth of the outer sleeve 7 is provided with a pair of loading and unloading grooves 15 for the installation and removal of the retaining frame 8.

[0021] Figure 7 In the figure, the outer surface of the cage 8 is the outer spherical surface 18 of the cage, the center of which is B, the inner surface of the cage 8 is the inner spherical surface 19 of the cage, the center of which is A, the outer spherical surface 18 of the cage and the inner spherical surface 19 of the cage are coaxial but not concentric, and the centers B and A of the outer spherical surface 18 of the cage and the inner spherical surface 19 of the cage are 2 times the eccentric distance e. The cage 8 is provided with N window holes 20, and the outer spherical surface 18 of the cage and the inner spherical surface 19 of the cage are arranged symmetrically relative to the symmetry center of the window hole 20, that is, the distance between the center B of the outer spherical surface 18 of the cage and the center A of the inner spherical surface 19 of the cage and the symmetry center O of the window hole 20 is e, and OA=OB=e. The right end of the cage 8 is provided with a cylindrical surface 21, and the diameter of the cylindrical surface 21 is 0.2 to 0.5 mm larger than the diameter of the inner spherical surface 19 of the cage.

[0022] Figure 8 In the embodiment, the main body composed of the outer sleeve 7, the retaining frame 8, the steel balls 9 and the inner sleeve 10 is sleeved on both ends of the shaft 23, and the clamping rings 22 are fixed in pairs, which is used for the use condition of the ball cage coupling with a fixed length and no extension.

[0023] Fig. 9 In the figure, the main body composed of the outer sleeve 7, the retainer 8, the steel ball 9 and the inner sleeve 10, and the main body composed of the outer sleeve 1, the retainer 2, the steel ball 3 and the inner sleeve 4 are respectively mounted on both ends of the shaft 23, and the clamping rings 22 are fixed in pairs, which is used for the working condition that the ball cage coupling has a certain telescopic length.

[0024] The installation steps are as follows: ① Align the cage 8, the N outer spherical surfaces of the inner sleeve 10 are aligned with the N window holes 20 of the cage 8, the N grooves of the inner sleeve 10 are aligned with the N inner spherical surfaces of the cage 8, and the inner sleeve 10 is installed from the cylindrical surface 21 of the cage; ② The outer sleeve 7 is aligned, and the retainer 8 and the inner sleeve 10 are vertically loaded from the loading and unloading groove 15; ③ The inner spherical surface 13 of the outer sleeve and the outer spherical surface 18 of the retainer, the inner spherical surface 19 of the retainer and the outer spherical surface of the inner sleeve 10 are in place; ④ Rotate the inner sleeve 10 and drive the retainer 8 at the same time, and install the steel balls 3 in sequence; ⑤Inspection, installation completed; During the installation process, a small copper rod can be used to knock the steel ball to assist in assembly.

[0025] The disassembly steps are reversed as above.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball cage type synchronous universal coupling body, characterized in that: The invention comprises an outer sleeve (7), a retainer (8), steel balls (9) and an inner sleeve (10); the retainer (8) is arranged between an inner sleeve spherical surface (13) of the outer sleeve (7) and an outer sleeve spherical surface (10); the retainer (8) is provided with N window holes (20) along the circumferential direction; the N steel balls (9) are interference fit into the window holes (20) of the retainer (8) and are simultaneously placed in N inner grooves on the inner surface of the outer sleeve (7) and N outer grooves on the outer spherical surface of the inner sleeve (10); the inner sleeve spherical surface (13) of the outer sleeve (7) and the outer spherical surface (18) of the retainer are aligned with each other. The outer spherical surface of the inner sleeve (10) and the inner spherical surface (19) of the retainer are concentric; the inner spherical surface (13) of the outer sleeve (7) and the outer spherical surface (18) of the retainer are clearance-matched, and the retainer (8) rotates around the center of the outer spherical surface (18) of the retainer; a cylindrical surface (21) is provided at the inner ring end of the retainer (8); the outer spherical surface of the inner sleeve (10) and the inner spherical surface (19) of the retainer are clearance-matched, and the inner sleeve (10) rotates around the symmetry center O of the window hole, and the rotation angle of the retainer (8) is 1 / 2 of the rotation angle of the inner sleeve (10); A loading and unloading groove (15) is provided at the mouth of the outer sleeve (7). The inner surface of the outer sleeve (7) is composed of an inner cylindrical surface (12) of the outer sleeve and an inner spherical surface (13) of the outer sleeve. N inner grooves are arranged in the outer sleeve (7) at equal distances along the circumference. The length direction of the inner grooves is parallel to the axis of the outer sleeve (7). A groove wall is formed between any two adjacent inner grooves. The surface of the inner groove wall is composed of an inner cylindrical surface segment of the outer sleeve and an inner spherical surface segment of the outer sleeve connected to the inner cylindrical surface segment of the outer sleeve. The limiting surface segment is located outside the inner spherical surface segment of the outer sleeve. The inner cylindrical surface segments of the outer sleeve on the surface of each groove wall are arranged in a circle to form the inner cylindrical surface (12) of the outer sleeve. The inner spherical surface segments of the outer sleeve on the surface of each groove wall are arranged in a circle to form the inner spherical surface (13) of the outer sleeve.

2. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: Two opposite end portions of the channel walls are each provided with a groove for installing and removing the retaining frame (8) to form a pair of loading and unloading grooves (15).

3. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: A limiting surface (14) is provided at the mouth of the outer sleeve (7), and each channel wall end has a limiting surface segment, and the limiting surface segments at the end of each channel wall are arranged in a ring to form the limiting surface (14).

4. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: The end surface of the outer sleeve (7) is provided with N evenly distributed mounting holes (16), one mounting hole (16) corresponds to one channel wall, and the outer circumference of the outer sleeve (7) is provided with K peripheral teeth (17); N is an integer ≥ 6, and the number K of the peripheral teeth (17) is an integral multiple of N.

5. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: The outer spherical surface of the inner sleeve (10) is provided with N outer grooves distributed at equal distances along the circumference, the length direction of the outer grooves is parallel to the axis of the inner sleeve (10), and the inner hole of the inner sleeve (10) is provided with a spline (11) or a flat key.

6. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: The outer surface of the retainer (8) is the outer spherical surface (18) of the retainer, and the center of the outer spherical surface (18) of the retainer is B. The inner surface of the retainer (8) is the inner spherical surface (19) of the retainer, and the center of the inner spherical surface (19) of the retainer is A. The outer spherical surface (18) of the retainer and the inner spherical surface (19) of the retainer are coaxial but not concentric. The center of the inner spherical surface (19) of the retainer is offset to the left by a distance e relative to the symmetric center O of the retainer window hole, and the center of the outer spherical surface (18) of the retainer is offset to the right by a distance e relative to the symmetric center O of the retainer window hole.

7. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: The diameter of the cylindrical surface (21) is 0.2 to 0.5 mm greater than the diameter of the inner spherical surface (19) of the cage.

8. The ball cage type synchronous universal coupling body according to claim 1, characterized in that: The installation steps are as follows: ① The cage (8) is aligned, the N outer spherical surfaces of the inner sleeve (10) are aligned with the N window holes (20) of the cage (8), the N grooves of the inner sleeve (10) are aligned with the N inner spherical surfaces of the cage (8), and the inner sleeve (10) is installed from the cylindrical surface (21) end of the cage; ② The outer sleeve (7) is aligned, and the retainer (8) and the inner sleeve (10) are vertically inserted from the loading and unloading groove (15); ③ The inner spherical surface of the outer sleeve (13) and the outer spherical surface of the retainer (18), the inner spherical surface of the retainer (19) and the outer spherical surface of the inner sleeve (10) are in place; ④ Rotate the inner sleeve (10) and drive the retainer (8) at the same time, and install the steel balls (3) in sequence; ⑤Inspection, installation completed; The disassembly steps are reversed as above.

9. A ball cage type synchronous universal coupling, characterized in that: It comprises a shaft (23), both ends of which are installed into the ball cage type synchronous universal coupling body as claimed in any one of claims 1 to 7 via clamping rings (22).

10. A ball cage type synchronous universal coupling, characterized in that: The invention comprises a shaft (23), one end of the shaft (23) is installed in the ball cage type synchronous universal coupling body according to any one of claims 1 to 7 via a clamping ring (22), the other end of the shaft (23) is installed with a universal joint, or the other end of the shaft (23) is installed with a straight groove ball cage coupling via a clamping ring (5), and the straight groove ball cage coupling is provided with a retaining ring F.

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