High-rigidity small-diameter electric roller easy to assemble and disassemble

Abstract

The invention relates to a high-rigidity small-diameter electric roller easy to assemble and disassemble, which comprises a roller assembly and a motor, and the roller assembly comprises a roller body used for rotating output and a planet gear speed reducer arranged in the roller body; the planet gear speed reducer is a secondary planet gear speed reducer or a coupling gear ring secondary planet gear speed reducer; one end of the cylinder is provided with or not provided with an overrun clutch for preventing reversion; the barrel body structurally comprises a gear ring barrel body or a gear ring barrel body assembly, wherein the final-stage gear ring, used for rotation output, of the planetary gear speed reducer and the barrel body are arranged into a whole; a planet wheel disc, used as first-stage output, of the planet wheel speed reducer and a sun gear shaft used as second-stage input form an integrated disc shaft assembly, and the disc shaft assembly is supported by two bearings. The roller assembly is assembled in an inner tensioning mode or an outer pressing mode. The radial compactness and bending rigidity of the roller are improved, and meanwhile, the disassembly and assembly convenience and operation safety of the roller are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric rollers, in particular to a small-diameter electric roller with high rigidity and easy assembly and disassembly. Background Art

[0002] The diameters of the commonly used electric rollers in logistics equipment range from Φ50, Φ60 to Φ216. For small-diameter electric rollers, their radial structural dimensions are often difficult to meet the transmission ratio design, and increasing the number of transmission stages (such as changing the two-stage reduction to the three-stage reduction) not only increases the axial size but also increases the cost. For small-diameter electric rollers of the same size, the speed requirements are different. If the speed is only controlled by the motor, the cost will also increase. For small-diameter electric rollers of the same size, the power requirements are also different. If the gear module is changed and the straight teeth are changed to helical teeth, it is also limited by the radial size. At the same time, for thin and long electric rollers, the rotating cylinder also has the defect of low bending rigidity. In addition, for small-diameter electric rollers, if the existing interference fit assembly between the two-end supports and the cylinder, or the clearance fit assembly followed by laser welding is adopted, the assembly and disassembly is extremely inconvenient. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a small-diameter electric drum with high rigidity and easy assembly and disassembly, which improves the radial compactness and bending rigidity of the drum, and at the same time improves the convenience of assembly and disassembly of the drum and the safety of operation.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A small-diameter electric roller with high rigidity and easy assembly and disassembly, comprising a roller assembly and a motor, wherein the roller assembly comprises a cylinder body used for rotation output and a planetary gear reducer arranged in the cylinder body, wherein the planetary gear reducer is driven by the motor arranged outside the cylinder body; an overrunning clutch for preventing reverse rotation may or may not be arranged at one end of the cylinder body; the planetary gear reducer is arranged at the other end of the cylinder body; the planetary gear reducer is a two-stage planetary gear reducer or a two-stage planetary gear reducer coupled with a gear ring;

[0006] The planetary wheel disc used as the first-stage output of the planetary gear reducer and the central gear shaft used as the second-stage input form an integrated disc-shaft assembly, and the disc-shaft assembly is supported by two bearings;

[0007] The structure of the cylinder includes a ring gear cylinder or a ring gear cylinder assembly in which the final ring gear of the planetary gear reducer used as the rotation output is integrated with the cylinder; the inner wall of the ring gear cylinder is provided with transmission teeth; the ring gear cylinder assembly is coaxially connected in sequence by a left cylinder, a ring gear as the final ring gear, and a right cylinder;

[0008] The gear ring cylinder assembly of the coupled gear ring two-stage planetary gear reducer is formed by coaxially connecting a left cylinder, a gear ring as the final gear ring, a right cylinder, and a coupled internal gear ring in sequence, so that the gear ring of the final gear ring forms a transmission chain coupling relationship with the first-stage coupled internal gear ring, and the coupled internal gear ring is used to mesh with the first planetary gear;

[0009] The roller assembly is assembled by internal tensioning or external compression;

[0010] The roller assembly adopting the internal tensioning method is a hexagon socket screw pre-tightening roller, and its assembly structure is as follows:

[0011] It includes a fixed assembly formed by axially connecting a left end support, a long shaft, a gear housing, an inner gear ring, a flange and a right end support in sequence, wherein the left end support and the right end support are respectively matched with the first support rings on both sides through a slewing bearing, and the two first support rings are respectively arranged at both ends of the cylinder; the gear housing, the inner gear ring and the flange are used to form a mounting body of the planetary gear reducer, and the inner gear ring is used for meshing with the first planetary gear;

[0012] A hexagon socket screw is provided between the left end support and the long axis. The tension generated by the hexagon socket screw is transmitted by the mutual tension of the components in the fixing assembly to tighten the inner rings of the slewing bearings at both ends of the gear ring cylinder or the gear ring cylinder assembly. The outer rings of the slewing bearings enable the first support rings at both ends to axially clamp the gear ring cylinder or the gear ring cylinder assembly, and the two slewing bearings are pre-tightened; the pre-tightening force of the two slewing bearings is equal to the axial clamping force of the first support rings at both ends;

[0013] The right end support is used to be connected to the motor, and the right end support is used to accommodate the input shaft or long input shaft of the motor. The output end of the input shaft is meshed with the first planetary gear for transmission, and the output end of the long input shaft is meshed with the coupled first planetary gear for transmission. The left end support and the right end support are respectively provided with sealing end covers to close the two ends of the cylinder.

[0014] Further technical solutions are:

[0015] The roller assembly adopting the external compression method is a double-head screw pre-tightening roller, and its assembly structure is as follows:

[0016] It includes a fixed assembly formed by axially connecting a long left end support, a gear housing, an inner gear ring, a flange and a right end support in sequence, wherein the long left end support and the right end support are respectively matched with two second support rings through a slewing bearing, and the two second support rings are respectively arranged at both ends of the cylinder;

[0017] The fixed assembly is connected to the second support ring through double-headed screws evenly distributed along the circumferential direction. The pressure generated by the double-headed screws causes the second support rings at both ends to axially clamp the gear ring cylinder or the gear ring cylinder assembly. The second support ring presses the outer ring of the slewing bearing, and the inner ring of the slewing bearing is pre-tightened by the mutual pressure transmission between the components of the fixed assembly. The pre-tightening force of the two slewing bearings is smaller than the axial clamping force of the second support rings at both ends.

[0018] The roller assembly adopting the external compression method is a middle-broken-shaft double-head screw structure roller, and its assembly structure is:

[0019] It includes a short left end support and a long right end support, the short left end support and the long right end support are respectively matched with two third support rings through two sets of slewing bearings, and the two third support rings are respectively arranged at both ends of the cylinder;

[0020] The long right end support is connected with the flange, the inner gear ring, and the left short gear housing in sequence to form a reducer housing, which is connected with the third support ring through double-headed screws uniformly distributed along the circumference; the pressure generated by the double-headed screws causes the third support rings at both ends to axially clamp the gear ring cylinder or the gear ring cylinder assembly; there is no connection between the short left end support and the reducer housing, no force is transmitted, and the slewing bearing is not pre-tightened;

[0021] An adjusting sleeve is arranged between the two sets of slewing bearings at each end, and the adjusting sleeve is used for pre-tightening the slewing bearings on both sides thereof.

[0022] The roller assembly adopting the external pressing method is an intermediate separation double-head screw structure roller used for coupling the gear ring type two-stage planetary gear reducer, and its assembly structure is:

[0023] It comprises a fixed assembly formed by sequentially connecting a slotted long left end support, a gear housing, a flange and a long right end support along the axial direction, wherein the slotted long left end support and the long right end support are respectively matched with two third support rings through one or two sets of slewing bearings, and the two third support rings are respectively arranged at both ends of the cylinder;

[0024] The fixing assembly is connected to the third support ring through double-headed screws uniformly distributed along the circumference, and the pressure generated by the double-headed screws causes the third support rings at both ends to axially clamp the gear ring cylinder or the gear ring cylinder assembly;

[0025] There is an axial clearance between the gear housing, the flange and the coupled inner gear ring, and there is no force transmission, so the slewing bearings at both ends cannot be pre-tightened; in the case where two sets of slewing bearings are arranged at each end, an adjusting sleeve is provided between the two sets of slewing bearings, and the adjusting sleeve is used to pre-tighten the slewing bearings on both sides thereof.

[0026] The overrunning clutch is a second overrunning clutch, which is externally or internally disposed in the cylinder;

[0027] When placed externally, the rotating parts of the second overrunning clutch are respectively sleeved into the double-headed screw, and the fixed part is sleeved on the external anti-reverse long left end support, and is prevented from rotating by the flat key; the external anti-reverse long left end support is used to replace the long left end support, the short left end support or the slotted long left end support;

[0028] When built-in, the rotating parts of the second overrunning clutch are respectively inserted into the double-headed screw, and the fixed part is inserted into the inner anti-reverse long left end support, and is axially fixed by an elastic retaining ring on the shaft, and is prevented from rotating by a flat key; the inner anti-reverse long left end support is used to replace the long left end support, the short left end support or the slotted long left end support.

[0029] In addition to being connected by a double-start screw, the left cylinder, the gear ring and the right cylinder or the left cylinder, the gear ring, the right cylinder and the coupling inner gear ring are also connected by welding.

[0030] The overrunning clutch is a first overrunning clutch, which is externally or internally disposed in the cylinder;

[0031] When it is externally mounted, the rotating part of the first overrunning clutch is positioned and fixed on the first support ring, and the fixed part is sleeved on the external anti-reverse left end support and prevented from rotating by a flat key; the external anti-reverse left end support is used to replace the left end support;

[0032] When built-in, the rotating part of the first overrunning clutch is positioned and fixed on the first supporting ring, and the fixed part is sleeved on the anti-reverse long shaft and prevented from rotating by a flat key; the anti-reverse long shaft is used to replace the long shaft.

[0033] In the two-stage planetary gear reducer, the planetary wheel disc of the disc-shaft assembly and the central gear shaft are positioned and matched, and are fastened together by means of nuts and large washers, and the torque is transmitted by a semicircular key or a flat key.

[0034] The inner gear ring and the gear housing are connected by screws or welding.

[0035] The central gear shaft is meshed with the second planetary gear, and the second planetary gear is meshed with the final stage ring gear;

[0036] The first planetary wheel or the coupled first planetary wheel is matched with the step shaft through a needle bearing, and the step shaft is arranged in the planetary wheel disc;

[0037] The second planetary gear cooperates with a small shaft through a needle bearing, and the small shaft is arranged in the gear housing.

[0038] The beneficial effects of the present invention are as follows:

[0039] In terms of assembly and disassembly, hexagon socket bolts are used to fasten the two-end supports and the cylinder body at the center line of the drum at one end, or multiple double-headed screws are used to connect the two-end supports and the cylinder body, which is convenient for assembly and disassembly;

[0040] In terms of radial structure, ① the first-stage planetary gear carrier and the second-stage sun gear are integrated and the diameter of the second-stage sun gear is reduced as much as possible, so as to achieve compact radial dimensions while improving the second-stage transmission ratio; ② welding or double-headed screw connection is adopted to integrate the ring gear and the barrel, and the diameter of the gear on the ring gear is increased as much as possible, so as to achieve compact radial dimensions while improving the first and second stage transmission ratios; ③ the diameter of the first and second sun gears is changed, combined with the diameter of the first and second ring gears, to meet the different speed requirements of the same small-diameter electric drum;

[0041] In terms of axial structure, in order to improve the structural rigidity of the slender and long electric drum, the fixed two-end supports are integrated with the reducer supports, and they bear the bending load generated by the goods together with the rotating drum, or multiple studs are used to bear the bending load generated by the goods together with the drum;

[0042] In terms of safety, an overrunning clutch is installed or not installed on the left or right side of the non-driving support (inside or outside the cylinder) to prevent reverse rotation when the power is off.

[0043] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a cross-sectional view of Example 1 of the present invention ( Figure 2 AA section view).

[0045] Figure 2 for Figure 1 BB screenshot cross-sectional view.

[0046] Figure 3 Schematic diagram of the structure of the gear housing of Example 1 of the present invention ( Figure 4 (section view of CC section in the figure).

[0047] Figure 4 for Figure 3 Middle DD section cutaway view.

[0048] Figure 5 for Figure 3 Left view of .

[0049] Figure 6 This is a diagram of the brazing structure of the gear housing and the gear ring of Example 1 of the present invention.

[0050] Figure 7 It is the main cross-sectional view of the disk-shaft assembly of the semicircular key transmission of Example 1 of the present invention.

[0051] Figure 8This is a main sectional view of the external first overrunning clutch roller of Example 1 of the present invention.

[0052] Fig. 9 It is a main sectional view of the built-in first overrunning clutch roller of embodiment 1 of the present invention.

[0053] Fig.10 is a cross-sectional view of Example 2 of the present invention ( Fig.11 EE rotated section view).

[0054] Fig.11 It is a left view of embodiment 2 of the present invention.

[0055] Fig.12 It is the main cross-sectional view of the disk-shaft assembly of the flat key transmission of Example 2 of the present invention.

[0056] Fig.13 It is a main cross-sectional view of the external second overrunning clutch roller of embodiment 2 of the present invention.

[0057] Fig.14 It is a main sectional view of the built-in second overrunning clutch roller of embodiment 2 of the present invention.

[0058] Fig.15 It is a rotated cross-sectional view of embodiment 3 of the present invention.

[0059] Fig.16 This is a rotated cross-sectional view of an implementation method of Example 4 of the present invention.

[0060] Fig.17 This is a rotated cross-sectional view of another implementation manner of Example 4 of the present invention.

[0061] In the figure: 1, motor; 101, mounting flange;

[0062] 21. Hexagon socket screw preload roller; 22. Double-head screw preload roller; 23. Intermediate broken-shaft double-head screw structure roller; 24. Intermediate separation double-head screw structure roller for coupling gear ring type two-stage planetary gear reducer;

[0063] 201, right end support; 2011, long right end support; 202, input shaft; 2021, long input shaft; 203, flange; 204, slewing bearing; 205, end cover seal; 206, gear ring cylinder; 2061, gear ring; 2062, right cylinder; 2063, left cylinder; 207, inner gear ring; 2071, coupled inner gear ring; 208, gear housing; 2081, left short gear housing; 209, input shaft seal; 2091, input shaft small seal; 210, input shaft bearing; 2101, input shaft needle bearing; 211, needle bearing; 212, first planetary gear; 2121, coupled first planetary gear; 213, step shaft; 214, planetary wheel; 215 , small shaft; 216, second planetary gear; 217, central gear shaft; 218, large washer; 219, bearing; 220, first support ring; 2201, second support ring; 2202, third support ring; 221, long shaft; 2211, anti-reverse long shaft; 222, left end support; 2221, external anti-reverse left end support; 2222, long left end support; 2223, external anti-reverse long left end support; 2224, internal anti-reverse long left end support; 2225, short left end support; 2226, slotted long left end support; 223, end cover; 2241, first overrunning clutch; 2242, second overrunning clutch; 225, double-headed screw; 226, hexagon socket screw; 227, adjusting sleeve. DETAILED DESCRIPTION

[0064] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0065] Example 1

[0066] See also Figures 1 to 9 The embodiment of the present invention is a small-diameter electric roller with high rigidity and easy assembly and disassembly, comprising a roller assembly and a motor 1, wherein the roller assembly comprises a cylinder body for rotation output and a planetary gear reducer arranged in the cylinder body, and the planetary gear reducer is driven by the motor 1 arranged outside the cylinder body;

[0067] An overrunning clutch for preventing reverse rotation may or may not be provided at one end of the cylinder; the planetary gear reducer is provided at the other end of the cylinder;

[0068] The structure of the cylinder includes a ring gear cylinder 206 in which the final ring gear of the planetary gear reducer used for rotation output is integrated with the cylinder, and the inner wall of the ring gear cylinder 206 is provided with transmission teeth;

[0069] The gear ring cylinder assembly is composed of a coaxial left cylinder 2063, a gear ring 2061 as the final gear ring, and a right cylinder 2062 connected in sequence;

[0070] The planetary gear reducer is a two-stage planetary gear reducer, wherein the planetary wheel disc 214 used as the first-stage output and the central gear shaft 217 used as the second-stage input of the planetary gear reducer form an integrated disc-shaft assembly, and the disc-shaft assembly is supported by two bearings 219;

[0071] The roller assembly is a hexagon socket screw pre-tightening roller 21 assembled in an internal tensioning manner, and its assembly structure is as follows:

[0072] It includes a fixed assembly formed by axially connecting a left end support 222, a long shaft 221, a gear housing 208, an inner gear ring 207, a flange 203 and a right end support 201 in sequence; the left end support 222 and the right end support 201 are respectively matched with the first support rings 220 on both sides through a slewing bearing 204, and the two first support rings 220 are respectively arranged at both ends of the cylinder; the gear housing 208, the inner gear ring 207 and the flange 203 are used to constitute the mounting body of the planetary gear reducer, and the inner gear ring 207 is used as a primary gear ring for meshing with the first planetary gear 212; a hexagon socket screw 226 is provided between the left end support 222 and the long shaft 221.

[0073] The tension generated by the hexagon socket screw 226 is used to transmit the tension between the components in the fixing assembly, so as to tighten the inner rings of the gear ring cylinder 206 or the slewing bearings 204 at both ends of the gear ring cylinder assembly. The outer rings of the slewing bearings 204 cause the first support rings 220 at both ends to axially clamp the gear ring cylinder 206 or the gear ring cylinder assembly, and the two slewing bearings 204 are pre-tightened. The pre-tightening force of the two slewing bearings 204 is equal to the axial clamping force of the first support rings 220 at both ends.

[0074] Specifically, the right end support 201 is used to connect with the mounting flange 101 of the motor 1, and the right end support 201 is used to accommodate the input shaft 202 of the motor 1, and its output end is meshed with the first planetary gear 212 for transmission; an input shaft sealing ring 209 and an input shaft bearing 210 are provided between the input shaft 202 and the right end support 201; the left end of the right end support 201 has two straight grooves for fastening with set screws, and the groove width is clearance-matched with the diameter of the set screw head.

[0075] Specifically, in the two-stage planetary gear reducer, the planetary wheel disc 214 of the disc-shaft assembly is positioned and matched with the central gear shaft 217, and is fastened together with the aid of a nut and a large washer 218, and the torque is transmitted by a semicircular key or a flat key.

[0076] Specifically, the central gear shaft 217 is meshed with the second planetary gear 216, and the second planetary gear 216 is meshed with the final ring gear; the first planetary gear 212 or the coupled first planetary gear 2121 cooperates with the step shaft 213 through the needle bearing 211, and the step shaft 213 is arranged in the planetary wheel disc 214; the second planetary gear 216 cooperates with the small shaft 215 through the needle bearing 211, and the small shaft 215 is arranged in the gear housing 208.

[0077] Specifically, the left end support 222 and the right end support 201 are respectively provided with sealing end covers (end cover 223 and end cover sealing ring 205) to seal the two ends of the cylinder.

[0078] Specifically, the inner gear ring 207 and the gear housing 208 are connected by screws or welding, including butt welding, brazing, or laser welding.

[0079] The overrunning clutch provided in this embodiment is a first overrunning clutch 2241, which is externally or internally disposed in the cylinder;

[0080] See also Figure 8 When it is external, the rotating part of the first overrunning clutch 2241 is positioned and fixed on the first support ring 220, and the fixed part of the first overrunning clutch 2241 is sleeved on the external anti-reverse left end support 2221, and is prevented from rotating by the flat key; the external anti-reverse left end support 2221 is used to replace the left end support 222;

[0081] See also Fig. 9 When built-in, the rotating part of the first overrunning clutch 2241 is positioned and fixed on the first support ring 220, and the fixed part of the first overrunning clutch 2241 is sleeved on the anti-reverse long shaft 2211, and is prevented from rotating by a flat key; the anti-reverse long shaft 2211 is used to replace the long shaft 221.

[0082] Among them, the structural difference between the external anti-reversal left end support 2221 and the left end support 222 is: the axial dimension of the external anti-reversal left end support 2221 increases the axial thickness dimension of the first overrunning clutch 2241, its radial dimension has a clearance fit requirement with the inner hole of the first overrunning clutch 2241, and a keyway is added on the shaft.

[0083] The structural difference between the anti-reverse long shaft 2211 and the long shaft 221 is: the inner radial dimension of the anti-reverse long shaft 2211 has a step-type cylindrical surface, and this step-type cylindrical surface has a clearance fit requirement with the inner hole of the first overrunning clutch 2241 (the purpose of adding this step-type cylindrical surface is to reduce the finishing length of the clearance fit cylindrical surface and reduce costs), and a keyway on the shaft is added on this step-type cylindrical surface.

[0084] Example 2

[0085] See also Figures 10 to 14The embodiment of the present invention is a small-diameter electric roller with high rigidity and easy assembly and disassembly, and the differences from the embodiment 1 include:

[0086] The structure of the cylinder includes a ring gear cylinder assembly that connects the final ring gear of the planetary gear reducer used as a rotation output and the cylinder; the ring gear cylinder assembly is connected in sequence by a coaxial left cylinder 2063, a ring gear 2061 as the final ring gear, and a right cylinder 2062;

[0087] The roller assembly is a double-headed screw pre-tightening roller 22 assembled by external compression;

[0088] The overrunning clutch is a second overrunning clutch 2242, which is externally or internally disposed in the cylinder.

[0089] The assembly structure of the double-headed screw preload roller 22 is:

[0090] It includes a fixed assembly formed by a long left end support 2222, a gear housing 208, an inner gear ring 207, a flange 203 and a right end support 201 which are axially connected in sequence. The long left end support 2222 and the right end support 201 are respectively matched with two second support rings 2201 through a slewing bearing 204, and the two second support rings 2201 are respectively arranged at both ends of the cylinder; the fixed assembly is connected to the second support ring 2201 through a double-headed screw 225 uniformly distributed along the circumferential direction.

[0091] The pressure generated by the double-headed screw 225 causes the second support rings 2201 at both ends to axially clamp the gear ring cylinder 206 or the gear ring cylinder assembly. The second support ring 2201 presses the outer ring of the slewing bearing 204, and the inner ring of the slewing bearing 204 is pre-tightened by the mutual pressure transmission between the components of the fixed assembly. The pre-tightening force of the two slewing bearings 204 is smaller than the axial clamping force of the second support rings 2201 at both ends.

[0092] Specifically, an input shaft small sealing ring 2091 and an input shaft needle bearing 2101 are provided between the long input shaft 2021 and the right end support 201 of the two-stage planetary gear reducer of this embodiment.

[0093] In addition to being connected by the double-headed screw 225, the left cylinder 2063, the gear ring 2061 and the right cylinder 2062 are also connected by welding, including butt welding, brazing, or laser welding.

[0094] See also Fig.13 When it is external, the rotating part of the second overrunning clutch 2242 is respectively sleeved into the double-headed screw 225, and the fixed part is sleeved on the external anti-reverse long left end support 2223, and is prevented from rotating by the flat key; the external anti-reverse long left end support 2223 is used to replace the long left end support 2222, the short left end support 2225 or the slotted long left end support 2226;

[0095] See also Fig.14 When built-in, the rotating parts of the second overrunning clutch 2242 are respectively inserted into the double-headed screw 225, and the fixed parts are inserted into the inner anti-reverse long left end support 2224, and are axially fixed by an elastic retaining ring on the shaft, and are prevented from rotating by a flat key; the inner anti-reverse long left end support 2224 is used to replace the long left end support 2222, the short left end support 2225 or the slotted long left end support 2226.

[0096] Among them, the long left end support 2222 and the external anti-reversal long left end support 2223 are one type, and the short left end support 2225 and the slotted long left end support 2226 are another type;

[0097] The difference between the two categories is that the long left end support 2222 and the external anti-reversal long left end support 2223 of the first category are both supported by a slewing bearing 204, and the axial direction is extended to the inner hole of the gear housing 208 to form a clearance fit relationship, and there are flat keys to transmit torque, and there is an axial dimension chain relationship with the gear housing 208 to control the preload of the two-end slewing bearings 204; the short left end support 2225 and the slotted long left end support 2226 of the second category are both supported by two slewing bearings 204, and the preload of the slewing bearings 204 is adjusted by the adjusting sleeve 2 27 length control; and in the second category, the short left end support 2225 is not axially related to the left short gear housing 2081 and is disconnected, while the slotted long left end support 2226 is axially extended to the inner hole of the gear housing 208 to form a clearance fit relationship, and has a flat key to transmit torque, and has an axial dimension chain relationship with the gear housing 208. The axial dimension chain relationship is not to control the preload force of the two-end rotary bearings 204, but to ensure the axial clearance between the coupling first planetary gear 2121 and the flanges 203 on both sides and the gear housing 208;

[0098] The difference between the long left end support 2222 and the external anti-reverse long left end support 2223 is: ① the long left end support 2222 is not equipped with the second overrunning clutch 2242, which is a basic structure; ② the external anti-reverse long left end support 2223 is based on the long left end support 2222, and the axial dimension increases the axial thickness dimension of the second overrunning clutch 2242, and its radial dimension has a clearance fit requirement with the inner hole of the second overrunning clutch 2242, and a keyway on the shaft is added;

[0099] The difference between the short left end support 2225 and the slotted long left end support 2226 is: ① the short left end support 2225 is not equipped with the second overrunning clutch 2242, and is a basic structure; ② the slotted long left end support 2226 is based on the short left end support 2225, and the axial dimension is increased by the axial thickness dimension of the second overrunning clutch 2242, and its radial dimension has a clearance fit requirement with the inner hole of the second overrunning clutch 2242, and a keyway on the shaft is added;

[0100] The difference between the inner anti-reversal long left end support 2224 and the long left end support 2222 is: ① The second overrunning clutch 2242 is not installed on the long left end support 2222, which is a basic structure; ② The inner anti-reversal long left end support 2224 is based on the long left end support 2222, and its inner radial dimension has a step-shaped cylindrical surface, and this step-shaped cylindrical surface has a clearance fit requirement with the inner hole of the second overrunning clutch 2242 (the step-shaped cylindrical surface is added to reduce the finishing length of the clearance fit cylindrical surface and reduce the cost), and a keyway on the shaft is added on this step-shaped cylindrical surface;

[0101] The difference between the inner anti-reversal long left end support 2224 and the short left end support 2225 and the slotted long left end support 2226 is that the short left end support 2225 and the slotted long left end support 2226 are not equipped with the second overrunning clutch 2242. Fig.13 The outer anti-reversal long left end support 2223 or Fig.14 The inner anti-reversal long left end support 2224 is improved, and a second overrunning clutch 2242 is installed externally or internally.

[0102] Example 3

[0103] See also Fig.15 The high-rigidity, easy-to-assemble and disassemble small-diameter electric roller of this embodiment is different from that of Embodiment 2 in that: the roller assembly using the external clamping method is a middle-broken-shaft double-headed screw structure roller 23.

[0104] The assembly structure of the intermediate broken-shaft double-screw structure drum 23 is as follows:

[0105] It includes a short left end support 2225 and a long right end support 2011. The short left end support 2225 and the long right end support 2011 are respectively matched with two third support rings 2202 through two sets of rotary bearings 204. The two third support rings 2202 are respectively arranged at both ends of the cylinder; the long right end support 2011 is connected with the flange 203, the inner ring 207, and the left short gear housing 2081 in sequence to form a reducer housing, which is connected with the third support ring 2202 through a double-headed screw 225 uniformly distributed along the circumferential direction; specifically, the left end of the long right end support 2011 has two straight grooves for tightening with set screws, and the groove width is clearance-matched with the diameter of the set screw head.

[0106] The pressure generated by the double-headed screw 225 causes the third support rings 2202 at both ends to axially clamp the gear ring cylinder 206 or the gear ring cylinder assembly; there is no connection between the short left end support 2225 and the reducer housing, no force is transmitted, and the slewing bearing 204 is not pre-tightened; an adjusting sleeve 227 is provided between the two groups of slewing bearings 204 at each end, and the adjusting sleeve 227 is used to pre-tighten the slewing bearings 204 on both sides thereof.

[0107] Specifically, this embodiment uses a left short gear housing 2081 to replace the gear housing 208 of Embodiment 2, and the left short gear housing 2081 is not connected to the short left end support 2225 .

[0108] Specifically, the long right end support 2011 of this embodiment is used to connect with the motor 1, and at the same time, the long right end support 2011 is used to accommodate the long input shaft 2021 of the two-stage planetary gear reducer, the output shaft of the motor 1 and its coupling. The long right end support 2011 and the long input shaft 2021 respectively replace the right end support 201 and the input shaft 202 in Example 2. This is because two slewing bearings 204 are used for support and the adjusting sleeve 227 is used to control the preload force of the two slewing bearings 204. Therefore, the long right end support 2011 and the long input shaft 2021 are longer in axial dimension than the right end support 201 and the input shaft 202. The advantage is that the axial clamping force of the third support ring 2202 at both ends that axially clamps the gear ring cylinder 206 or the gear ring cylinder assembly is unrelated to the preload force of the slewing bearing 204 and is controlled separately (the axial clamping force of embodiments 1 and 2 is related to the bearing preload force, while the axial clamping force of embodiments 3 and 4 is unrelated to the bearing preload force); at the same time, the left short gear housing 2081 and the short left end support 2225 are disconnected, with a simple structure and convenient assembly (the bending rigidity of embodiment 3 is not as good as that of embodiments 1, 2, and 4, and the left short gear housing 2081 and the short left end support 2225 are completely disconnected in embodiment 3. The axial movement and torque between the long shaft 221 and the gear housing 208 in embodiment 1 are restricted, the axial movement and torque between the long left end support 2222 and the gear housing 208 in embodiment 2 are restricted, and the axial movement and torque between the slotted long left end support 2226 and the gear housing 208 in embodiment 4 are restricted).

[0109] Example 4

[0110] See also Fig.16 The high-rigidity, easy-to-assemble and disassemble small-diameter electric roller of this embodiment is different from that of Embodiment 3 in the following aspects:

[0111] The planetary gear reducer is a coupled ring gear two-stage planetary gear reducer. The ring gear cylinder assembly of the coupled ring gear two-stage planetary gear reducer is connected in sequence by a coaxial left cylinder 2063, a ring gear 2061 as the final ring gear, a right cylinder 2062, and a coupled inner ring gear 2071. The coupled inner ring gear 2071 is used to engage with the coupled first planetary gear 2121, that is, the first planetary gear 2121 is used to replace the first planetary gear 212 in Example 3 in this embodiment.

[0112] The drum assembly is assembled by external compression, and is used to couple the gear ring type two-stage planetary gear reducer with an intermediate separation type double-head screw structure drum 24, and its assembly structure is as follows:

[0113] It includes a fixing assembly formed by a slotted long left end support 2226, a gear housing 208, a flange 203 and a long right end support 2011 connected in sequence along the axial direction, wherein the slotted long left end support 2226 and the long right end support 2011 are respectively matched with two third support rings 2202 through two sets of rotary bearings 204, and the two third support rings 2202 are respectively arranged at both ends of the cylinder; the fixing assembly is connected to the third support rings 2202 through a double-headed screw 225 uniformly distributed along the circumferential direction; specifically, the right end of the slotted long left end support 2226 has a straight groove for tightening with a set screw, and the groove width is clearance-matched with the diameter of the set screw head.

[0114] The pressure generated by the double-headed screw 225 causes the third support rings 2202 at both ends to axially clamp the gear ring cylinder 206 or the gear ring cylinder assembly; there is an axial gap between the gear housing 208, the flange 203 and the coupled inner gear ring 2071, and there is no force transmission, so the slewing bearings 204 at both ends cannot be pre-tightened; for the two groups of slewing bearings 204 arranged at each end, an adjusting sleeve 227 is provided between the two groups of slewing bearings 204, and the adjusting sleeve 227 is used to pre-tighten the slewing bearings 204 on both sides.

[0115] As a variation of the above embodiment, see Fig.17 , an intermediate separated double-head screw structure roller 24 for coupling a gear ring type two-stage planetary gear reducer, in which a long left end support 2222 and a right end support 201 replace the slotted long left end support 2226 and the long right end support 2011, and a second support ring 2201 replaces the third support ring 2202.

[0116] Among them, the long left end support 2222 and the right end support 201 are each matched with the two second support rings 2201 through a slewing bearing 204. The two slewing bearings 204 cannot be pre-tightened, and the axial clearance between the gear housing 208 and the flange 203 and the coupled inner gear ring 2071 is relatively large, which can be suitable for light load occasions.

[0117] In addition to being connected by the double-headed screw 225, the left cylinder 2063, the gear ring 2061, the right cylinder 2062 and the coupled inner gear ring 2071 are also connected by welding, including butt welding, brazing, or laser welding.

[0118] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A small-diameter electric drum with high rigidity and easy assembly and disassembly, comprising a drum assembly and a motor (1), wherein the drum assembly comprises a cylinder body for rotation output and a planetary gear reducer arranged in the cylinder body, wherein the planetary gear reducer is driven by the motor (1) arranged outside the cylinder body; characterized in that: An overrunning clutch for preventing reverse rotation may or may not be provided at one end of the cylinder; the planetary gear reducer is provided at the other end of the cylinder; the planetary gear reducer is a two-stage planetary gear reducer or a two-stage planetary gear reducer coupled with a gear ring; The planetary wheel disc (214) used as the first-stage output of the planetary gear reducer and the central gear shaft (217) used as the second-stage input form an integrated disc-shaft assembly, and the disc-shaft assembly is supported by two bearings (219); The structure of the cylinder comprises a ring gear cylinder (206) or a ring gear cylinder assembly in which the final ring gear of the planetary gear reducer used for rotation output is integrated with the cylinder; the inner wall of the ring gear cylinder (206) is provided with transmission teeth; the ring gear cylinder assembly is composed of a left cylinder (2063), a ring gear (2061) as the final ring gear, and a right cylinder (2062) which are coaxially connected in sequence; The gear ring cylinder assembly of the coupled gear ring two-stage planetary gear reducer is formed by coaxially connecting a left cylinder (2063), a gear ring (2061) as the final gear ring, a right cylinder (2062), and a coupled inner gear ring (2071) in sequence, so that the gear ring (2061) of the final gear ring and the first-stage coupled inner gear ring (2071) form a transmission chain coupling relationship, and the coupled inner gear ring (2071) is used to mesh with the first planetary gear (2121); The roller assembly is assembled by internal tensioning or external compression; The roller assembly adopting the internal tensioning method is a hexagon socket screw pre-tightening roller (21), and its assembly structure is as follows: The invention comprises a fixed assembly formed by axially connecting a left end support (222), a long shaft (221), a gear housing (208), an inner gear ring (207), a flange (203) and a right end support (201) in sequence, wherein the left end support (222) and the right end support (201) are respectively matched with first support rings (220) on both sides through a slewing bearing (204), and the two first support rings (220) are respectively arranged at both ends of the cylinder; the gear housing (208), the inner gear ring (207) and the flange (203) are used to form a mounting body of a planetary gear reducer, and the inner gear ring (207) is used to mesh with the first planetary gear (212); A hexagon socket screw (226) is provided between the left end support (222) and the long shaft (221). The tension generated by the hexagon socket screw (226) is used to transmit the tension between the components in the fixing assembly to tighten the inner rings of the gear ring cylinder (206) or the gear ring cylinder assembly at both ends. The outer rings of the slewing bearings (204) enable the first support rings (220) at both ends to axially clamp the gear ring cylinder (206) or the gear ring cylinder assembly. The two slewing bearings (204) are pre-tightened. The pre-tightening force of the two slewing bearings (204) is equal to the axial clamping force of the first support rings (220) at both ends. The right end support (201) is used to be connected to the motor (1), and the right end support (201) is used to accommodate the input shaft (202) or the long input shaft (2021) of the motor (1), the output end of the input shaft (202) is meshed with the first planetary gear (212) for transmission, and the output end of the long input shaft (2021) is meshed with the coupled first planetary gear (2121) for transmission; the left end support (222) and the right end support (201) are respectively provided with sealing end covers to seal the two ends of the cylinder.

2. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The roller assembly adopting the external pressing method is a double-headed screw pre-tightening roller (22), and its assembly structure is as follows: It comprises a fixed assembly formed by axially connecting a long left end support (2222), a gear housing (208), an inner gear ring (207), a flange (203) and a right end support (201) in sequence, wherein the long left end support (2222) and the right end support (201) are respectively matched with two second support rings (2201) through a slewing bearing (204), and the two second support rings (2201) are respectively arranged at two ends of the cylinder; The fixed assembly is connected to the second support ring (2201) via double-headed screws (225) uniformly distributed along the circumferential direction. The pressure generated by the double-headed screws (225) causes the second support rings (2201) at both ends to axially clamp the gear ring cylinder (206) or the gear ring cylinder assembly. The second support ring (2201) presses the outer ring of the slewing bearing (204). The inner ring of the slewing bearing (204) is pre-tightened by the mutual pressure transmission between the components of the fixed assembly. The pre-tightening force of the two slewing bearings (204) is smaller than the axial clamping force of the second support rings (2201) at both ends.

3. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The roller assembly adopting the external pressing method is a middle-broken-shaft double-head screw structure roller (23), and its assembly structure is as follows: It comprises a short left end support (2225) and a long right end support (2011), wherein the short left end support (2225) and the long right end support (2011) are respectively matched with two third support rings (2202) through two sets of slewing bearings (204), and the two third support rings (2202) are respectively arranged at two ends of the cylinder; The long right end support (2011) is connected with the flange (203), the inner gear ring (207), and the left short gear housing (2081) in sequence to form a reducer housing, which is connected with the third support ring (2202) via double-headed screws (225) uniformly distributed along the circumference; the pressure generated by the double-headed screws (225) causes the third support rings (2202) at both ends to axially clamp the gear ring cylinder (206) or the gear ring cylinder assembly; there is no connection between the short left end support (2225) and the reducer housing, no force is transmitted, and the slewing bearing (204) is not pre-tightened; An adjusting sleeve (227) is arranged between the two sets of slewing bearings (204) at each end, and the adjusting sleeve (227) is used to pre-tighten the slewing bearings (204) at both sides thereof.

4. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The roller assembly adopting the external pressing method is an intermediate separation type double-head screw structure roller (24) for coupling a gear ring type two-stage planetary gear reducer, and its assembly structure is as follows: It comprises a fixed assembly formed by sequentially connecting a slotted long left end support (2226), a gear housing (208), a flange (203) and a long right end support (2011) along the axial direction, wherein the slotted long left end support (2226) and the long right end support (2011) are respectively matched with two third support rings (2202) through one or two sets of slewing bearings (204), and the two third support rings (2202) are respectively arranged at two ends of the cylinder; The fixing assembly is connected to the third support ring (2202) via double-headed screws (225) uniformly distributed along the circumferential direction, and the pressure generated by the double-headed screws (225) causes the third support rings (2202) at both ends to axially clamp the gear ring cylinder (206) or the gear ring cylinder assembly; There is an axial gap between the gear housing (208), the flange (203) and the coupling inner gear ring (2071), so there is no force transmission and the slewing bearings (204) at both ends cannot be pre-tightened. In the case where two sets of slewing bearings (204) are arranged at each end, an adjusting sleeve (227) is arranged between the two sets of slewing bearings (204), and the adjusting sleeve (227) is used to pre-tighten the slewing bearings (204) on both sides thereof.

5. The high-rigidity, easily assembled and disassembled small-diameter electric drum according to any one of claims 2 to 4, characterized in that: The overrunning clutch is a second overrunning clutch (2242), which is externally or internally disposed in the cylinder; When placed externally, the rotating parts of the second overrunning clutch (2242) are respectively sleeved into the double-headed screw (225), and the fixed part is sleeved on the external anti-reverse long left end support (2223), and is prevented from rotating by a flat key; the external anti-reverse long left end support (2223) is used to replace the long left end support (2222), the short left end support (2225) or the slotted long left end support (2226); When built-in, the rotating parts of the second overrunning clutch (2242) are respectively inserted into the double-headed screw (225), and the fixed part is inserted into the inner anti-reverse long left end support (2224), and is axially fixed by an elastic retaining ring on the shaft, and is prevented from rotating by a flat key; the inner anti-reverse long left end support (2224) is used to replace the long left end support (2222), the short left end support (2225) or the slotted long left end support (2226).

6. The high-rigidity, easily assembled and disassembled small-diameter electric drum according to any one of claims 2 to 4, characterized in that: In addition to being connected by the double-headed screw (225), the left cylinder (2063), the gear ring (2061) and the right cylinder (2062) or the left cylinder (2063), the gear ring (2061), the right cylinder (2062) and the coupled inner gear ring (2071) are also connected by welding.

7. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The overrunning clutch is a first overrunning clutch (2241), which is externally or internally disposed in the cylinder; When placed externally, the rotating part of the first overrunning clutch (2241) is positioned and fixed on the first support ring (220), and the fixed part is sleeved on the external anti-reverse left end support (2221) and prevented from rotating by a flat key; the external anti-reverse left end support (2221) is used to replace the left end support (222); When built-in, the rotating part of the first overrunning clutch (2241) is positioned and fixed on the first supporting ring (220), and the fixed part is sleeved on the anti-reverse long shaft (2211) and prevented from rotating by a flat key; the anti-reverse long shaft (2211) is used to replace the long shaft (221).

8. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: In the two-stage planetary gear reducer, the planetary wheel disc (214) of the disc shaft assembly and the central gear shaft (217) are positioned and matched, and are fastened together by means of nuts and large washers (218), and torque is transmitted by means of a semicircular key or a flat key.

9. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The inner gear ring (207) and the gear housing (208) are connected by screws or welding.

10. The high-rigidity, easy-to-assemble and disassemble small-diameter electric drum according to claim 1, characterized in that: The central gear shaft (217) is meshed with the second planetary gear (216), and the second planetary gear (216) is meshed with the final stage ring gear; The first planetary gear (212) or the coupled first planetary gear (2121) cooperates with the step shaft (213) through a needle bearing (211), and the step shaft (213) is arranged in the planetary wheel disc (214); The second planetary gear (216) cooperates with a small shaft (215) via a needle bearing (211), and the small shaft (215) is arranged in the gear housing (208).

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