Lubricating and cooling structure and electric roller

Abstract

The utility model relates to the technical field of electric rollers, discloses a lubricating and cooling structure and an electric roller, and aims to improve the lubricating and cooling effect of a speed reducer and ensure the running reliability. The electric roller comprises a lubricating and cooling structure and a roller internally provided with a cavity, and the lubricating and cooling structure comprises a first supporting shaft used for supporting one axial end of the roller; an oil inlet channel and an oil outlet channel are formed in the first supporting shaft; the speed reducer is arranged in the cavity and is supported on the first supporting shaft; the speed reducer comprises a gear shaft and a gear set, and the meshing positions of all stages of gears of the gear set are arranged around the gear shaft. A gear shaft oil duct is arranged in the gear shaft, the gear shaft oil duct is communicated with the oil inlet duct, and an oil return opening is formed in the peripheral wall of the gear shaft; and the oil return port is communicated with the meshed part of each stage of gear of the gear set, and is communicated with the oil outlet channel through the cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of electric rollers, in particular to a lubrication and cooling structure and an electric roller. Background Technique

[0002] In recent years, with the continuous development of the belt conveyor industry towards large-capacity, energy-saving and environmental protection, the driving mode of the driving belt roller under high-power working conditions has gradually changed from the form of an asynchronous motor plus an external gearbox to the direction of motor permanent magnetization. And increasing the speed of the permanent magnet motor and matching it with a planetary reducer is an effective measure to reduce costs, reduce the volume and increase the power density of the roller drive permanent magnetization. Since the speed of the motor is increased and the reducer is connected to the motor for speed reduction and torque increase, the speed ratio in the reducer is relatively high. There are higher requirements for lubrication and cooling.

[0003] The existing method is to lubricate through the lubricating oil preset in the reducer. However, with this method, the components in the middle of the reducer cannot be immersed in the lubricating oil, so they cannot be lubricated and cooled, and it is difficult to ensure the reliability of the operation of the reducer. Content of the Utility Model

[0004] In view of this, the utility model provides a lubrication and cooling structure and an electric roller to solve the problem that the internal components of the reducer cannot be lubricated and cooled, and it is difficult to ensure the operation reliability.

[0005] In the first aspect, the utility model provides a lubrication and cooling structure, which is applied to an electric roller. The electric roller includes a roller, and a cavity is formed inside the roller; the lubrication and cooling structure includes: a first support shaft for supporting one axial end of the roller; an oil inlet passage and an oil outlet passage are formed inside the first support shaft; a reducer is arranged in the cavity and supported on the first support shaft; the reducer includes a gear shaft and a gear set, and the meshing parts of the gears at all levels of the gear set are arranged around the gear shaft; a gear shaft oil passage is arranged inside the gear shaft, the gear shaft oil passage is communicated with the oil inlet passage, and an oil return port is formed on the outer peripheral wall of the gear shaft; the oil return port is communicated with the meshing parts of the gears at all levels of the gear set, and is communicated with the oil outlet passage through the cavity.

[0006] Beneficial effects: In this solution, the lubricating oil can enter the gear shaft oil passage from the oil inlet passage, and flow out of the gear shaft and the meshing parts of the gears at all levels through the oil return port, realizing the lubrication and cooling of the gear shaft in the middle of the reducer and the meshing parts of the gears at all levels, and improving the reliability of the operation of the reducer; the lubricating oil flowing out of the oil return port finally flows into the cavity and is discharged through the oil outlet passage, realizing the circulating flow of the lubricating oil.

[0007] In an alternative embodiment, the gear shaft oil passage includes a central hole and an oil outlet hole; the gear shaft has an output end and an input end; the central hole extends from the output end towards the input end and communicates with the oil inlet passage at the output end; from the output end to the input end, the diameter of the central hole gradually increases; one end of the oil outlet hole communicates with the central hole, and the other end forms an oil return port on the outer peripheral wall of the gear shaft.

[0008] Advantageous effects: From the output end to the input end, the diameter of the central hole gradually increases. The linear velocity is small at the part with a small diameter and large at the part with a large diameter. The lubricating oil will flow from the place with a small linear velocity to the place with a large linear velocity, that is, towards the input end, so as to ensure that the lubricating oil can flow to the high-speed end and improve the lubrication and cooling effects.

[0009] Preferably, from the output end to the input end, the included angle between the oil outlet hole and the central hole is an acute angle.

[0010] Advantageous effects: From the output end to the input end, the included angle between the oil outlet hole and the central hole is an acute angle, that is, the oil outlet hole is inclined towards the input end in the radial direction of the central hole, so as to ensure that the lubricating oil can flow to the high-speed end and further improve the lubrication and cooling effects.

[0011] In an alternative embodiment, the oil outlet hole includes a third oil outlet hole and a fourth oil outlet hole, and the third oil outlet hole and the fourth oil outlet hole are arranged at intervals along the axial direction of the central hole.

[0012] Advantageous effects: The lubricating oil can flow to different positions along the axial direction of the gear shaft through the third oil outlet hole and the fourth oil outlet hole respectively, which is convenient for lubricating and cooling the inside of the speed reducer in a targeted manner.

[0013] In an alternative embodiment, the gear set includes, arranged coaxially in sequence: a first-stage planetary gear assembly, rotatably connected to the input end of the gear shaft and meshing with the gear shaft; a second-stage sun gear, rotatably connected to the gear shaft and fixedly connected to the first-stage planetary gear assembly; a second-stage planetary gear assembly, rotatably sleeved outside the gear shaft and meshing with the second-stage sun gear; an output gear, rotatably connected to the output end of the gear shaft; the second-stage planetary gear assembly is sleeved outside the output gear and fixedly connected to the output gear; wherein, a first annular gap is formed between the output gear and the gear shaft, the first annular gap communicates with the third oil outlet hole and the meshing part between the second-stage sun gear and the second-stage planetary gear assembly; a second annular gap is formed between the second-stage sun gear and the gear shaft, the second annular gap communicates with the fourth oil outlet hole and the meshing part between the first-stage planetary gear assembly and the gear shaft.

[0014] Beneficial effects: The lubricating oil can reach the meshing position of the second-stage sun gear and the second-stage planetary gear assembly through the third oil outlet hole, and reach the meshing position of the first-stage planetary gear assembly and the gear shaft through the fourth oil outlet hole, realizing the lubrication and cooling of each stage of gears in the speed reducer, further improving the lubrication and cooling effects, and ensuring the reliability of the operation of each stage of gears in the speed reducer.

[0015] In an alternative embodiment, from the output end to the input end, the outer diameter dimension of the first annular gap shows an increasing trend; and / or, the outer diameter dimension of the second annular gap shows an increasing trend.

[0016] Beneficial effects: From the output end to the input end, the outer diameter dimension of the first annular gap shows an increasing trend, that is, when the gear shaft rotates, the linear velocity in the first annular gap shows an increasing trend. Through the linear velocity difference, the lubricating oil can be thrown to the meshing position of the second-stage sun gear and the second-stage planetary gear assembly, ensuring the reliability of gear lubrication and cooling; from the output end to the input end, the outer diameter dimension of the second annular gap shows an increasing trend, that is, when the gear shaft rotates, the linear velocity in the second annular gap shows an increasing trend. Through the linear velocity difference, the lubricating oil can be thrown to the meshing position of the first-stage planetary gear assembly and the gear shaft, further ensuring the reliability of gear lubrication and cooling.

[0017] In an alternative embodiment, the gear shaft and the first-stage planetary gear assembly are rotatably connected through a first bearing, and the second annular gap communicates with the position where the first bearing is located.

[0018] Beneficial effects: The first bearing is connected between the gear shaft and the first-stage planetary gear assembly and belongs to a high-speed bearing, which has high requirements for lubrication and cooling. In this solution, the lubricating oil can reach the first bearing through the second annular gap, realizing the lubrication and cooling of the high-speed bearing, and further improving the reliability of the operation of the speed reducer.

[0019] In an alternative embodiment, the two axial ends of the first support shaft are respectively a first end and a second end; the oil inlet passage forms an oil inlet at the first end and communicates with the gear shaft oil passage at the second end; the oil outlet passage forms an oil outlet at the first end and communicates with the cavity at the second end.

[0020] Beneficial effects: Both the oil inlet passage and the oil outlet passage are arranged on the first support shaft, and the oil inlet of the oil inlet passage and the oil outlet of the oil outlet passage are both located at the first end of the first support shaft, which is convenient for installation and connection with the external driving structure, and avoids too long lead wires.

[0021] In an alternative embodiment, the first support shaft includes: a support shaft portion, with a first end and a second end formed at the two axial ends of the support shaft portion respectively; a first oil inlet hole, a first oil outlet hole and a second oil outlet hole are provided inside the support shaft portion, and an installation groove is provided at the second end of the support shaft portion; the first oil inlet hole and the first oil outlet hole both penetrate axially through the first end and the bottom wall of the installation groove, and the second oil outlet hole penetrates radially through the side wall of the installation groove; a cover portion, connected inside the installation groove; a second oil inlet hole and a notch are provided inside the cover portion; the second oil inlet hole penetrates axially through the cover portion, and one end of the second oil inlet hole communicates with the first oil inlet hole, and the other end is aligned with the gear shaft oil passage; the notch is provided at one end of the cover portion close to the support shaft portion, and the notch communicates the first oil outlet hole and the second oil outlet hole; wherein, the first oil inlet hole and the second oil inlet hole form an oil inlet passage, and the first oil inlet hole forms an oil inlet at the first end; the first oil outlet hole, the notch and the second oil outlet hole form an oil outlet passage, and the first oil outlet hole forms an oil outlet at the first end;

[0022] Advantageous effects: The first oil inlet hole and the second oil inlet hole of the oil inlet passage penetrate through the support shaft portion and the cover portion respectively, which is convenient for the processing of the oil inlet passage; the first oil outlet hole and the second oil outlet hole of the oil outlet passage both penetrate through the support shaft portion, and the notch is provided at one end of the cover portion, which is convenient for the processing of the oil outlet passage. By setting the support shaft portion and the cover portion in this solution, the processing difficulty of the oil inlet passage and the oil outlet passage is reduced, and thus the processing cost is reduced.

[0023] Preferably, a communication groove is further provided at one end of the cover portion close to the support shaft portion, and the communication groove is communicatively arranged between the first oil inlet hole and the second oil inlet hole;

[0024] Advantageous effects: The provision of the communication groove facilitates compensating for the position deviation of the first oil inlet hole and the second oil inlet hole along the radial direction of the first support shaft, and realizing the communication between the first oil inlet hole and the second oil inlet hole.

[0025] Preferably, a counterbore is provided at the notch of the installation groove; the cover portion includes a boss and a flange extending around the boss, the boss is arranged inside the installation groove, and the flange is arranged inside the counterbore; the communication groove and the notch are provided at one end of the boss close to the installation groove;

[0026] Advantageous effects: The provision of the counterbore and the flange facilitates the connection between the support shaft portion and the cover portion.

[0027] Preferably, the first support shaft further includes an oil pipe, one end of the oil pipe is connected and communicated with the second oil outlet hole, and the other end extends towards the bottom of the cavity.

[0028] Advantageous effects: Since the height of the lubricating oil level inside the drum is limited, the provision of the oil pipe facilitates extending into the lubricating oil liquid level for pumping oil, and improves the reliability of the lubricating oil circulation.

[0029] In a second aspect, the present utility model further provides an electric drum, including: a drum, a cavity is formed inside the drum; the lubrication and cooling structure as described above.

[0030] Beneficial effects: The electric roller of the present utility model includes the above lubrication and cooling structure, and has the same technical effects as the lubrication and cooling structure of the present utility model, which will not be elaborated here.

[0031] In an optional embodiment, the electric roller further includes: a motor disposed in the cavity and drivingly connected to one end of the gear shaft away from the first support shaft; a planetary gear disc assembly disposed in the cavity and fixedly connected between the first support shaft and the speed reducer; the planetary gears of the planetary gear disc assembly are engaged with the output gear of the speed reducer and also engaged with the inner wall of the roller; a second support shaft, and the second support shaft and the first support shaft are respectively rotatably connected to both axial ends of the roller; the second support shaft is fixedly connected to the motor and is axially provided with a wire outlet hole.

[0032] Beneficial effects: In this solution, the power lines of the speed reducer and the motor are both led out through the second support shaft. The circulating oil passage of the speed reducer is located at the end where the first support shaft is located, that is, the oil circuit and the circuit of the electric roller are separated at both ends without mutual intersection, which is convenient for installation and improves the safety of use. Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a cross-sectional view of an electric roller according to an embodiment of the present utility model;

[0035] Figure 2 It is a cross-sectional view of a speed reducer according to an embodiment of the present utility model and its partial enlarged view;

[0036] Figure 3 It is a cross-sectional view of a gear shaft according to an embodiment of the present utility model;

[0037] Figure 4 It is a cross-sectional view of an output gear according to an embodiment of the present utility model;

[0038] Figure 5 It is a cross-sectional view of a second-stage sun gear according to an embodiment of the present utility model;

[0039] Figure 6 It is a cross-sectional view of a first support shaft according to an embodiment of the present utility model and its partial enlarged view;

[0040] Figure 7A cross-sectional view of a support shaft portion according to an embodiment of the present utility model;

[0041] Figure 8 A perspective view of a support shaft portion according to an embodiment of the present utility model;

[0042] Figure 9 A cross-sectional view of a cover body portion according to an embodiment of the present utility model;

[0043] Figure 10 A side view of a cover body portion according to an embodiment of the present utility model;

[0044] Figure 11 A perspective view of a cover body portion according to an embodiment of the present utility model;

[0045] Figure 12 A schematic structural view of a lubrication and cooling oil path according to an embodiment of the present utility model.

[0046] Explanation of reference numerals:

[0047] 1. Drum; 11. Drum body; 12. First support flange; 13. Second support flange; 14. First support bearing; 15. Second support bearing; 16. Internal gear ring;

[0048] 2. First support shaft; 21. Support shaft portion; 211. First end; 212. Second end; 213. First oil inlet hole; 214. First oil outlet hole; 215. Second oil outlet hole; 216. Installation groove; 217. Sunk groove; 22. Cover body portion; 221. Second oil inlet hole; 222. Communication groove; 223. Notch; 224. Boss; 225. Flange; 226. First sealing groove; 227. Second sealing groove; 23. Oil pipe; 24. First sealing ring; 25. Second sealing ring;

[0049] 3. Reducer; 31. Gear shaft; 311. Input end; 312. Output end; 313. Central hole; 314. Third oil outlet hole; 315. Fourth oil outlet hole; 32. First-stage planetary gear assembly; 33. First bearing; 34. Second-stage sun gear; 340. Second annular gap; 341. Sun gear; 3411. Inner wall of second gear; 342. Adapter plate; 35. Second-stage planetary gear assembly; 36. Second bearing; 37. Output gear; 370. First annular gap; 371. Inner wall of first gear; 38. Third bearing; 39. Reducer housing;

[0050] 4. Motor;

[0051] 5. Planetary gear disc assembly;

[0052] 6. Second support shaft;

[0053] 7. Circulating oil passage; 71. Oil inlet passage; 72. Oil inlet; 73. Gear shaft oil passage; 74. Oil return port; 75. Oil outlet passage; 76. Oil outlet;

[0054] 8. Lubricating oil level. Detailed implementation manners

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0056] The following combines Figures 1 to 12 to describe the embodiments of the present utility model.

[0057] According to an embodiment of the present utility model, on the one hand, a lubricating and cooling structure is provided, which is applied in an electric roller, as shown in Figure 1 and Figure 12 . The electric roller includes a roller 1, and a cavity is formed inside the roller 1. Specifically, the lubricating and cooling structure includes a first support shaft 2, a speed reducer 3 supported on the first support shaft 2, and a circulating oil passage 7 formed in the first support shaft 2 and the speed reducer 3. Among them, the first support shaft 2 is used to support one axial end of the roller 1, the speed reducer 3 is supported in the cavity through the first support shaft 2, and the circulating oil passage 7 forms an oil circulation in the first support shaft 2, the speed reducer 3 and the cavity of the roller 1 to achieve the purpose of lubricating and cooling the speed reducer 3.

[0058] More specifically, the first support shaft 2 is rotatably connected to one axial end of the roller 1, such as through a rotating bearing. The two axial ends of the first support shaft 2 are respectively a first end 211 and a second end 212, the first end 211 is located outside the cavity, and the second end 212 is located inside the cavity.

[0059] The speed reducer 3 includes a speed reducer housing 39 and a gear shaft 31 and a gear set provided in the speed reducer housing 39. The speed reducer housing 39 is connected to the first support shaft 2, such as by bolt connection, riveting, clamping, etc. The gear shaft 31 is disposed axially through the speed reducer housing 39. The gear shaft 31 has an output end 312 and an input end 311. The output end 312 faces the second end 212 of the first support shaft 2, and the input end 311 is used to be drivingly connected to the motor 4 to output the power of the motor 4. The gear set is sleeved on the gear shaft 31 and is drivingly connected between the speed reducer housing 39 and the gear shaft 31. The meshing portions of the gears at all levels of the gear set are arranged around the gear shaft.

[0060] The circulating oil passage 7 includes an oil inlet passage 71, a gear shaft oil passage 73, and an oil outlet passage 75 that are connected in a circulating manner. The oil inlet passage 71 and the oil outlet passage 75 are both formed in the first support shaft 2, and the gear shaft oil passage 73 is formed in the gear shaft 31 and extends from the output end 312 towards the input end 311. Among them, the oil inlet passage 71 forms an oil inlet 72 at the first end 211 and is connected to the gear shaft oil passage 73 at the second end 212. The oil outlet passage 75 forms an oil outlet 76 at the first end 211 and is connected to the cavity at the second end 212. The gear shaft oil passage 73 has an oil return port 74 formed on the outer peripheral wall of the gear shaft 31. The oil return port 74 is connected to the meshing portions of the gears at all levels of the gear set and is connected to the oil outlet passage 75 through the cavity.

[0061] In some embodiments, the first support shaft 2 can be directly connected to the reducer housing 39, or the first support shaft 2 can be indirectly connected to the reducer housing 39 through other structures, such as being connected through a planetary gear disc between the first support shaft 2 and the reducer housing 39.

[0062] In some embodiments, the gear shaft 31 of the reducer 3 can be coaxially arranged with the first support shaft 2.

[0063] It should be noted that the reducer housing 39 is in communication with the cavity inside the drum 1, that is, the lubricating oil flowing out of the gear shaft oil passage 73 can finally flow back into the cavity.

[0064] Using the technical solution of the present utility model, firstly, the lubricating oil can enter the gear shaft oil passage 73 from the oil inlet passage 71 and flow out of the gear shaft 31 and the meshing portions of the gears at all levels through the oil return port 74, realizing the lubrication and cooling of the gear shaft 31 of the reducer 3 and the meshing portions of the gears at all levels, and improving the reliability of the operation of the reducer 3. The lubricating oil flowing out of the oil return port 74 finally flows into the cavity and is discharged through the oil outlet passage 75, realizing the circulating flow of the lubricating oil. It can be understood that the input end 311 of the gear shaft 31 is usually directly connected to the motor 4 and is the high-speed end of the reducer 3, with higher requirements for lubrication and cooling. The gear shaft oil passage 73 of this solution extends from the output end 312 to the input end 311 of the gear shaft 31, facilitating the delivery of the lubricating oil to the high-speed end of the reducer 3 to further ensure the reliability of the operation of the reducer 3.

[0065] Secondly, both the oil inlet passage 71 and the oil outlet passage 75 are arranged on the first support shaft 2, and the oil inlet 72 of the oil inlet passage 71 and the oil outlet 76 of the oil outlet passage 75 are both located at the first end 211 of the first support shaft 2, which is convenient for installation and connection with the external driving structure, avoiding too long lead wires.

[0066] In some embodiments, the oil inlet 72 of the oil inlet passage 71 and the oil outlet 76 of the oil outlet passage 75 are both located on the end face of the first end 211 far from the second end 212 to further improve the convenience of installation.

[0067] In some embodiments, such as Figure 2 and 3 shown, the gear shaft oil passage 73 includes a central hole 313 and an oil outlet hole. Among them, the central hole 313 extends from the output end 312 to the input end 311, and communicates with the oil inlet passage 71 at the output end 312. That is, the central hole 313 penetrates through the end of the output end 312 to facilitate communication with the oil inlet passage 71; alternatively, the central hole 313 can penetrate through the ends of both the output end 312 and the input end 311 at the same time. One end of the oil outlet hole communicates with the central hole 313, and the other end forms an oil return port 74 on the outer peripheral wall of the gear shaft 31. That is, the oil outlet hole extends in the radial direction of the gear shaft 31 to communicate the central hole 313 and the outer periphery of the gear shaft 31.

[0068] In some embodiments, from the output end 312 to the input end 311, the diameter of the central hole 313 gradually increases. With such a setting, the linear velocity at the part with a small diameter of the central hole 313 is small, and the linear velocity at the part with a large diameter is large. The lubricating oil will flow from the place with a small linear velocity to the place with a large linear velocity, that is, flow towards the input end 311, so as to ensure that the lubricating oil can flow to the high-speed end and improve the lubrication and cooling effects.

[0069] In some embodiments, from the output end 312 to the input end 311, the included angle between the oil outlet hole and the central hole 313 is an acute angle. That is, the oil outlet hole is inclined towards the input end 311 in the radial direction of the central hole 313 to ensure that the lubricating oil can flow to the high-speed end and further improve the lubrication and cooling effects.

[0070] In some embodiments, the oil outlet hole includes a third oil outlet hole 314 and a fourth oil outlet hole 315, and the third oil outlet hole 314 and the fourth oil outlet hole 315 are arranged at intervals along the axial direction of the central hole 313. In this way, the lubricating oil can flow to different positions along the axis of the gear shaft 31 through the third oil outlet hole 314 and the fourth oil outlet hole 315 respectively, which is convenient for lubricating and cooling the inside of the speed reducer 3 in a targeted manner.

[0071] In some embodiments, there are multiple third oil outlet holes 314 and multiple fourth oil outlet holes 315. The multiple third oil outlet holes 314 are arranged at intervals around the circumference of the central hole 313, and the multiple fourth oil outlet holes 315 are arranged at intervals around the circumference of the central hole 313. The multiple third oil outlet holes 314 and the multiple fourth oil outlet holes 315 jointly form multiple oil return ports 74 on the outer peripheral wall of the gear shaft 31.

[0072] In some embodiments, the speed reducer 3 is a planetary speed reducer, and the above-mentioned gear shaft 31 is a sun gear shaft. The above-mentioned speed reducer housing 39 includes a speed reducer flange and a speed reducer internal gear housing connected to each other, and the sun gear shaft is disposed through the installation space enclosed by the speed reducer flange and the speed reducer internal gear housing.

[0073] In some embodiments, the gear set includes a first-stage planetary gear assembly 32 , a first bearing 33 , a second-stage sun gear 34 , a second-stage planetary gear assembly 35 and the output gear 37 , which are coaxially arranged in sequence.

[0074] The first bearing 33 is sleeved and fixed on the input end 311 of the gear shaft 31, and the first-stage planetary gear assembly 32 is rotatably connected to the input end 311 of the gear shaft 31 through the first bearing 33. The first-stage planetary gear assembly 32 is meshed with the gear shaft 31 and with the gear housing inside the reducer.

[0075] The second-stage sun gear 34 is rotatably connected to the gear shaft 31, and one end close to the first-stage planetary gear assembly 32 is fixedly connected to the first-stage planetary gear assembly 32, and one end away from the first-stage planetary gear assembly 32 is meshed with the second-stage planetary gear assembly 35. Figure 5 As shown, the second-stage sun gear 34 includes a coaxially arranged and connected sun gear 341 and an adapter plate 342, wherein the sun gear 341 is arranged close to the second-stage planetary gear assembly 35 and meshes with the second-stage planetary gear assembly 35. The adapter plate 342 is arranged close to the first-stage planetary gear assembly 32 and is fixedly connected to the first-stage planetary gear assembly 32, such as by bolts; at the same time, the adapter plate 342 presses the outer ring of the first bearing 33.

[0076] Among them, a second bearing 36 is provided on the side of the reducer flange facing the reducer internal gear housing, the outer ring of the second bearing 36 is fixedly connected to the reducer flange, and the inner ring is fixedly connected to the second-stage planetary gear assembly 35. That is, the second-stage planetary gear assembly 35 is rotatably connected to the reducer flange through the second bearing 36, and is rotatably sleeved on the outer side of the gear shaft 31. The end of the second-stage planetary gear assembly 35 away from the second-stage sun gear 34 is fixedly connected to the inner ring of the second bearing 36, and the end close to the second-stage sun gear 34 is meshed with the second-stage sun gear 34, and is also meshed with the reducer internal gear housing.

[0077] The output end 312 of the gear shaft 31 is also provided with a third bearing 38, and the output gear 37 is rotatably connected to the output end 312 of the gear shaft 31 through the third bearing 38. The second-stage planetary gear assembly 35 is sleeved on the outer side of the output gear 37, one end of the output gear 37 is fixedly connected to the second-stage planetary gear assembly 35, and the other end is transmission-connected to the drum 1. Exemplarily, a planetary gear plate assembly 5 can be provided between the reducer 3 and the first support shaft 2, and the output gear 37 can be transmission-connected to the drum 1 through the planetary gear plate assembly 5.

[0078] In some embodiments, the inner diameter of the output gear 37 is slightly larger than the inner diameter of the gear shaft 31 to form a first annular gap 370 between the output gear 37 and the gear shaft 31. The first annular gap 370 communicates with the third oil outlet hole 314 and the meshing part of the second-stage sun gear 34 and the second-stage planetary gear assembly 35. Lubricating oil can reach the meshing part of the second-stage sun gear 34 and the second-stage planetary gear assembly 35 through the third oil outlet hole 314.

[0079] In some embodiments, the inner diameter of the second-stage sun gear 34 is slightly larger than the inner diameter of the gear shaft 31 to form a second annular gap 340 between the second-stage sun gear 34 and the gear shaft 31. The second annular gap 340 communicates with the fourth oil outlet hole 315 and the meshing part of the first-stage planetary gear assembly 32 and the gear shaft 31. Lubricating oil can reach the meshing part of the first-stage planetary gear assembly 32 and the gear shaft 31 through the fourth oil outlet hole 315.

[0080] In the above embodiments, by providing the first annular gap 370 and the second annular gap 340, lubrication and cooling of the gears at all levels in the speed reducer 3 can be achieved, further improving the lubrication and cooling effects and ensuring the reliability of the operation of the gears at all levels in the speed reducer 3.

[0081] In some embodiments, the aperture of the third oil outlet hole 314 is slightly smaller than the aperture of the fourth oil outlet hole 315 so that part of the lubricating oil can reach the fourth oil outlet hole 315 after passing through the third oil outlet hole 314.

[0082] In some embodiments, from the output end 312 to the input end 311, the outer diameter dimension of the first annular gap 370 shows an increasing trend. That is, when the gear shaft 31 rotates, the linear velocity in the first annular gap 370 shows an increasing trend, and the lubricating oil can be thrown to the meshing part of the second-stage sun gear 34 and the second-stage planetary gear assembly 35 through the linear velocity difference, ensuring the reliability of gear lubrication and cooling.

[0083] Exemplarily, as Figure 4 shown, the output gear 37 has a first gear inner wall 371, and the first annular gap 370 is formed between the first gear inner wall 371 and the outer wall of the gear shaft 31. Among them, the first gear inner wall 371 includes a first cylindrical section and a first conical section. The first conical section is located at one end of the output gear 37 close to the second-stage planetary gear assembly 35, that is, one end close to the meshing part of the second-stage sun gear 34 and the second-stage planetary gear assembly 35. From the output end 312 to the input end 311, the diameter of the first cylindrical section remains unchanged, and the diameter of the first conical section gradually increases.

[0084] Exemplarily, the first gear inner wall 371 can also be integrally conical, that is, from the output end 312 to the input end 311, the diameter of the first gear inner wall 371 gradually increases.

[0085] Understandably, the diameter of the inner wall 371 of the first gear, which is also the inner diameter of the output gear 37 and the outer diameter of the first annular gap 370.

[0086] In some embodiments, from the output end 312 to the input end 311, the outer diameter dimension of the second annular gap 340 shows an increasing trend. That is, when the gear shaft 31 rotates, the linear velocity within the second annular gap 340 shows an increasing trend. Through the linear velocity difference, the lubricating oil can be thrown to the meshing position between the first-stage planetary gear assembly 32 and the gear shaft 31, further ensuring the reliability of gear lubrication and cooling.

[0087] Exemplarily, as Figure 5 shown, the sun gear 341 has a second gear inner wall 3411, and the second annular gap 340 is formed between the second gear inner wall 3411 and the outer wall of the gear shaft 31. Among them, the second gear inner wall 3411 includes a second cylindrical section and a second conical section. The second conical section is located at one end of the sun gear 341 close to the adapter plate 342, that is, one end close to the meshing position between the first-stage planetary gear assembly 32 and the gear shaft 31. From the output end 312 to the input end 311, the diameter of the second cylindrical section remains unchanged, and the diameter of the second conical section gradually increases.

[0088] Exemplarily, the second gear inner wall 3411 can also be integrally conical, that is, from the output end 312 to the input end 311, the diameter of the second gear inner wall 3411 gradually increases.

[0089] Understandably, the diameter of the second gear inner wall 3411 is also the inner diameter of the second-stage sun gear 34 and the outer diameter of the second annular gap 340.

[0090] In some embodiments, the gear shaft 31 and the first-stage planetary gear assembly 32 are rotatably connected through the above-mentioned first bearing 33, and the second annular gap 340 communicates with the position where the first bearing 33 is located. Understandably, the first bearing 33 is connected between the gear shaft 31 and the first-stage planetary gear assembly 32 and belongs to a high-speed bearing, which has relatively high requirements for lubrication and cooling. In this example, the lubricating oil can reach the first bearing 33 through the second annular gap 340 to achieve the lubrication and cooling of the high-speed bearing, further improving the reliability of the operation of the speed reducer 3.

[0091] In some embodiments, as Figures 6 - 11 shown, the first support shaft 2 includes a support shaft portion 21 and a cover portion 22 connected to each other, and the support shaft portion 21 and the cover portion 22 can be coaxially arranged.

[0092] Wherein, the first end 211 and the second end 212 of the first support shaft 2 are respectively formed at the two axial ends of the support shaft portion 21. A first oil inlet hole 213, a first oil outlet hole 214 and a second oil outlet hole 215 are provided in the support shaft portion 21, and an installation groove 216 is provided at the second end 212 of the support shaft portion 21. The first oil inlet hole 213 and the first oil outlet hole 214 both axially penetrate through the bottom wall of the first end 211 and the installation groove 216, and the second oil outlet hole 215 radially penetrates through the side wall of the installation groove 216. The cover portion 22 is connected in the installation groove 216, and a second oil inlet hole 221 and a notch 223 are provided in the cover portion 22. The second oil inlet hole 221 axially penetrates through the cover portion 22, one end of the second oil inlet hole 221 communicates with the first oil inlet hole 213, and the other end is directly opposite to the gear shaft oil passage 73. The notch 223 is provided at one end of the cover portion 22 close to the support shaft portion 21, and the notch 223 communicates the first oil outlet hole 214 and the second oil outlet hole 215.

[0093] Wherein, the first oil inlet hole 213 and the second oil inlet hole 221 form an oil inlet passage 71, and the first oil inlet hole 213 forms an oil inlet 72 at the first end 211. The first oil outlet hole 214, the notch 223 and the second oil outlet hole 215 form an oil outlet passage 75, and the first oil outlet hole 214 forms an oil outlet 76 at the first end 211. In this embodiment, the first oil inlet hole 213 and the second oil inlet hole 221 of the oil inlet passage 71 respectively penetrate through the support shaft portion 21 and the cover portion 22, which is convenient for the processing of the oil inlet passage 71; the first oil outlet hole 214 and the second oil outlet hole 215 of the oil outlet passage 75 are both axially penetrated and provided on the support shaft portion 21, and the notch 223 is provided at one end of the cover portion 22, which is convenient for the processing of the oil outlet passage 75. By providing the support shaft portion 21 and the cover portion 22 in this solution, the processing difficulty of the oil inlet passage 71 and the oil outlet passage 75 is reduced, and thus the processing cost is reduced.

[0094] Further, in some embodiments, a communication groove 222 is further provided at one end of the cover portion 22 close to the support shaft portion 21, and the communication groove 222 is communicatively arranged between the first oil inlet hole 213 and the second oil inlet hole 221. The provision of the communication groove 222 facilitates compensating for the position deviation of the first oil inlet hole 213 and the second oil inlet hole 221 along the radial direction of the first support shaft 2 and realizing the communication between the first oil inlet hole 213 and the second oil inlet hole 221.

[0095] Exemplarily, the first oil inlet hole 213 and the first oil outlet hole 214 are respectively arranged on both sides of the axis of the support shaft portion 21, the second oil inlet hole 221 is located at the axis of the cover portion 22 and the support shaft portion 21, and both ends of the communication groove 222 communicate with the first oil inlet hole 213 and the second oil inlet hole 221 respectively. As Figure 10 shown, the communication groove 222 can extend along the radial direction of the cover portion 22 to realize the simultaneous communication between the first oil inlet hole 213 and the second oil inlet hole 221. Exemplarily, the communication groove 222 can be set as a kidney-shaped hole, a rectangular hole, a U-shaped hole, etc.

[0096] In some embodiments, the support shaft portion 21, the cover body portion 22 and the gear shaft 31 are coaxially arranged. A protruding portion is provided on the middle of the cover body portion 22 facing the gear shaft 31. The protruding portion is located at the axis of the cover body portion 22. The second oil outlet hole 215 is correspondingly arranged in the protruding portion to facilitate docking with the central hole 313 in the gear shaft 31 and spray lubricating oil into the central hole 313.

[0097] Furthermore, in some embodiments, a counterbore 217 is provided at the notch of the installation groove 216. The cover body portion 22 includes a boss 224 and a flange 225 extending around the boss 224. The boss 224 is arranged in the installation groove 216, and the flange 225 is arranged in the counterbore 217. The communication groove 222 and the notch 223 are provided at one end of the boss 224 close to the installation groove 216. The provision of the counterbore 217 and the flange 225 facilitates the connection between the support shaft portion 21 and the cover body portion 22. Exemplarily, the counterbore 217 and the flange 225 can be connected by means such as bolt connection, riveting, welding, etc.

[0098] Wherein, the shape structure of the installation groove 216 matches the shape structure of the boss 224, and the installation groove 216 and the boss 224 can be of a non-circular structure so that after the two are assembled, the communication groove 222 corresponds to the first oil inlet hole 213, and the notch 223 corresponds to the first oil outlet hole 214 and the second oil outlet hole 215. Exemplarily, the installation groove 216 can be configured as a square groove, and the boss 224 can be configured as a square boss 224.

[0099] Furthermore, in some embodiments, a first sealing groove 226 is provided on the end face of the boss 224 facing the installation groove 216. Specifically, the first sealing groove 226 is arranged around the outer peripheral side of the communication groove 222. A first sealing ring 24 is arranged in the first sealing groove 226, and the first sealing ring 24 is used to seal the connection between the communication groove 222 and the first oil inlet hole 213.

[0100] In some embodiments, a second sealing groove 227 is provided on the end face of the flange 225 facing the counterbore 217. A second sealing ring 25 is arranged in the second sealing groove 227, and the second sealing ring 25 is used to seal between the cover body portion 22 and the support shaft portion 21.

[0101] In some embodiments, the first support shaft 2 further includes an oil pipe 23. One end of the oil pipe 23 is connected and communicated with the second oil outlet hole 215, and the other end extends towards the bottom of the cavity. As Figure 12 shown, Figure 12 some possible lubricating oil levels 8 in the drum 1 are shown. Since the height of the lubricating oil level 8 inside the drum 1 is limited, the provision of the oil pipe 23 facilitates extending into the lubricating oil liquid level for pumping oil, improving the reliability of the lubricating oil circulation.

[0102] According to an embodiment of the utility model, on the other hand, an electric roller is also provided, comprising a roller 1 and a lubrication and cooling structure described in any of the above embodiments. A cavity is formed in the roller 1, and the lubrication and cooling structure comprises a first support shaft 2, a reducer 3 supported on the first support shaft 2, and a circulating oil channel 7 formed in the first support shaft 2 and the reducer 3. The first support shaft 2 is used to support one axial end of the roller 1, and the reducer 3 is supported in the cavity by the first support shaft 2. The circulating oil channel 7 forms an oil circulation in the first support shaft 2, the reducer 3 and the cavity of the roller 1 to achieve the purpose of lubricating and cooling the reducer 3. The electric roller of the utility model has the same technical effect as the lubrication and cooling structure of the utility model, which will not be repeated here.

[0103] Furthermore, in some embodiments, Figure 1 As shown, the electric drum further includes a motor 4 , a planetary gear assembly 5 and a second support shaft 6 .

[0104] The motor 4 is arranged in the cavity and is transmission-connected to the end of the gear shaft 31 away from the first support shaft 2, that is, the input end 311 of the gear shaft 31, to provide driving force. The planetary gear plate assembly 5 is arranged in the cavity and is fixedly connected between the first support shaft 2 and the reducer 3. Exemplarily, the planetary gear plate assembly 5 includes a planetary gear plate and a plurality of planetary gears rotatably connected to the planetary gear plate. The planetary gears are meshed with the output gear 37 of the reducer 3 and the inner wall of the drum 1 at the same time, so as to finally transmit the driving force of the motor 4 to the drum 1 and rotate the drum 1. The second support shaft 6 and the first support shaft 2 are respectively rotatably connected to the axial ends of the drum 1. The second support shaft 6 and the first support shaft 2 are used to be fixedly connected to the external structure to provide support for the electric drum.

[0105] In some embodiments, the second support shaft 6 is fixedly connected to the motor 4, and a wire outlet hole is provided along the axial direction. In this way, the power lines of the reducer 3 and the motor 4 are both led out through the second support shaft 6, and the circulating oil channel 7 of the reducer 3 is located at the end where the first support shaft 2 is located, that is, the oil circuit and the line of the electric drum belong to both ends without interlacing, which is convenient for installation and improves the safety of use.

[0106] In some embodiments, the drum 1 includes a drum body 11, a first support flange 12 and a second support flange 13 that are respectively bolted to both axial ends of the drum body 11. The first support flange 12, the drum body 11 and the second support flange 13 jointly define the above-mentioned cavity. A first support bearing 14 is provided in the first support flange 12, and a second support bearing 15 is provided in the second support flange 13. The first support shaft 2 is rotatably connected to the inside of the first support flange 12 through the first support bearing 14, and the second support shaft 6 is rotatably connected to the inside of the second support flange 13 through the second support bearing 15. Moreover, the planetary gear disc assembly 5, the speed reducer 3 and the motor 4 are all arranged between the first support flange 12 and the second support flange 13.

[0107] In some embodiments, an internal gear ring 16 is provided on the inner wall of the drum body 11. A plurality of planetary gears of the planetary gear disc assembly 5 are meshed with the output gear 37 and at the same time meshed with the internal gear ring 16 to transmit the power of the motor 4 and the speed reducer 3 to the drum body 11, and the drum body 11 drives the first support flange 12 and the second support flange 13 to rotate relative to the first support shaft 2 and the second support shaft 6. Among them, the internal gear ring 16 can be fixed to the inner side wall of the drum body 11 through a connecting structure, or can be integrally formed on the inner side wall of the drum body 11.

[0108] The following describes the circulation process of the lubricating oil in the present invention with reference to the illustrated embodiments: The external lubricating oil enters the first oil inlet hole 213 through the oil inlet 72 of the first support shaft 2, passes through the communication groove 222 of the cover body portion 22, and finally sprays out from the second oil inlet hole 221 and enters the central hole 313 of the gear shaft 31. During the rotation of the gear shaft 31, part of the lubricating oil in the central hole 313 enters the first annular gap 370 through the third oil outlet hole 314 and is thrown out onto the first gear inner wall 371 of the output gear 37, and finally is thrown to the meshing part of the second-stage sun gear 34 and the second-stage planetary gear assembly 35 for lubrication and cooling. The remaining lubricating oil in the central hole 313 continues to flow towards the input end 311, enters the second annular gap 340 through the fourth oil outlet hole 315 and is thrown out onto the second gear inner wall 3411 of the second-stage sun gear 34, and finally is thrown to the first bearing 33 and the meshing part of the gear shaft 31 and the first-stage planetary gear assembly 32 for lubrication and cooling. After the lubricating oil lubricates and cools the inside of the speed reducer 3, it flows out, returns to the lower part of the cavity in the drum 1, is pumped up by the oil pipe 23, and is pumped out through the oil outlet 76 of the oil outlet channel 75 in the first support shaft 2. After heat exchange and cooling outside, it is pumped into the first support shaft 2 again through the oil inlet 72 to realize the circulation of the lubricating oil.

[0109] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A lubricating and cooling structure is applied to an electric roller. The electric roller includes a roller (1), and a cavity is formed inside the roller (1). It is characterized in that, The lubrication and cooling structure includes: A first support shaft (2) for supporting one axial end of the roller (1); an oil inlet passage (71) and an oil outlet passage (75) are formed in the first support shaft (2). A speed reducer (3) is disposed in the cavity and supported on the first support shaft (2); the speed reducer (3) includes a gear shaft (31) and a gear set, and the meshing portions of the gears at all levels of the gear set are arranged around the gear shaft (31); a gear shaft oil passage (73) is provided in the gear shaft (31), the gear shaft oil passage (73) communicates with the oil inlet passage (71), and an oil return port (74) is formed on the outer peripheral wall of the gear shaft (31); the oil return port (74) communicates with the meshing portions of the gears at all levels of the gear set and communicates with the oil outlet passage (75) through the cavity.

2. The lubricating and cooling structure according to claim 1, wherein The gear shaft oil passage (73) includes a central hole (313) and an oil outlet hole. The gear shaft has an output end (312) and an input end (311); the central hole (313) extends from the output end (312) towards the input end (311) and communicates with the oil inlet passage (71) at the output end (312); from the output end (312) to the input end (311), the diameter of the central hole (313) gradually increases. One end of the oil outlet hole communicates with the central hole (313), and the other end forms the oil return port (74) on the outer peripheral wall of the gear shaft (31). Preferably, from the output end (312) to the input end (311), the included angle between the oil outlet hole and the central hole (313) is an acute angle.

3. The lubricating and cooling structure according to claim 2, characterized in that, The oil outlet hole includes a third oil outlet hole (314) and a fourth oil outlet hole (315), and the third oil outlet hole (314) and the fourth oil outlet hole (315) are arranged at intervals along the axial direction of the central hole (313).

4. The lubricating and cooling structure according to claim 3, characterized in that The gear set includes, arranged coaxially in sequence: A first-stage planetary gear assembly (32), rotatably connected to the input end (311) of the gear shaft (31) and meshing with the gear shaft (31). A second-stage sun gear (34), rotatably connected to the gear shaft (31) and fixedly connected to the first-stage planetary gear assembly (32). A second-stage planetary gear assembly (35), rotatably sleeved outside the gear shaft (31) and meshing with the second-stage sun gear (34). An output gear (37), rotatably connected to the output end (312) of the gear shaft (31); the second-stage planetary gear assembly (35) is sleeved outside the output gear (37) and fixedly connected to the output gear (37). Wherein, a first annular gap (370) is formed between the output gear (37) and the gear shaft (31). The first annular gap (370) communicates with the third oil outlet hole (314) and also communicates with the meshing position of the second-stage sun gear (34) and the second-stage planetary gear assembly (35); a second annular gap (340) is formed between the second-stage sun gear (34) and the gear shaft (31). The second annular gap (340) communicates with the fourth oil outlet hole (315) and also communicates with the meshing position of the first-stage planetary gear assembly (32) and the gear shaft (31).

5. The lubricating and cooling structure according to claim 4, characterized in that From the output end (312) to the input end (311), the outer diameter dimension of the first annular gap (370) shows an increasing trend; and / or, the outer diameter dimension of the second annular gap (340) shows an increasing trend.

6. The lubricating and cooling structure according to claim 4, characterized in that, The gear shaft (31) and the first-stage planetary gear assembly (32) are rotatably connected through a first bearing (33), and the second annular gap (340) communicates with the position where the first bearing (33) is located.

7. The lubricating and cooling structure according to any one of claims 1-6, characterized in that, Axial two ends of the first support shaft (2) are respectively a first end (211) and a second end (212); The oil inlet passage (71) forms an oil inlet (72) at the first end (211) and communicates with the gear shaft oil passage (73) at the second end (212); the oil outlet passage (75) forms an oil outlet (76) at the first end (211) and communicates with the cavity at the second end (212).

8. The lubricating and cooling structure according to claim 7, characterized in that The first support shaft (2) includes: A support shaft portion (21), with the axial two ends of the support shaft portion (21) respectively forming the first end (211) and the second end (212); a first oil inlet hole (213), a first oil outlet hole (214) and a second oil outlet hole (215) are arranged inside the support shaft portion (21), and an installation groove (216) is provided at the second end (212) of the support shaft portion (21); both the first oil inlet hole (213) and the first oil outlet hole (214) axially penetrate through the first end (211) and the bottom wall of the installation groove (216), and the second oil outlet hole (215) radially penetrates through the side wall of the installation groove (216); A cover body portion (22), connected inside the installation groove (216); a second oil inlet hole (221) and a notch (223) are arranged inside the cover body portion (22); the second oil inlet hole (221) axially penetrates through the cover body portion (22), one end of the second oil inlet hole (221) communicates with the first oil inlet hole (213), and the other end is opposite to the gear shaft oil passage (73); the notch (223) is arranged at one end of the cover body portion (22) close to the support shaft portion (21), and the notch (223) communicates the first oil outlet hole (214) and the second oil outlet hole (215); Wherein, the first oil inlet hole (213) and the second oil inlet hole (221) form the oil inlet passage (71), and the first oil inlet hole (213) forms the oil inlet (72) at the first end (211); the first oil outlet hole (214), the notch (223) and the second oil outlet hole (215) form the oil outlet passage (75), and the first oil outlet hole (214) forms the oil outlet (76) at the first end (211). Preferably, one end of the cover body part (22) close to the support shaft part (21) is further provided with a communication groove (222), and the communication groove (222) is communicatively arranged between the first oil inlet hole (213) and the second oil inlet hole (221). Preferably, a counterbore (217) is provided at the notch of the installation groove (216); the cover body part (22) includes a boss (224) and a flange (225) extending around the boss (224), the boss (224) is arranged in the installation groove (216), and the flange (225) is arranged in the counterbore (217); the communication groove (222) and the notch (223) are arranged at one end of the boss (224) close to the installation groove (216). Preferably, the first support shaft (2) further includes an oil pipe (23), one end of the oil pipe (23) is connected and communicated with the second oil outlet hole (215), and the other end extends towards the bottom of the cavity.

9. An electric roller, characterized in that, Including: A drum (1), a cavity is formed inside the drum (1). The lubrication and cooling structure according to any one of claims 1 to 8.

10. The electric roller according to claim 9, characterized in that, The electric drum further includes: A motor (4), arranged inside the cavity and drivingly connected to one end of the gear shaft (31) away from the first support shaft (2). A planetary gear disc assembly (5), arranged inside the cavity and fixedly connected between the first support shaft (2) and the speed reducer (3); the planetary gears of the planetary gear disc assembly (5) are meshed with the output gear (37) of the speed reducer (3) and meshed with the inner wall of the drum (1). A second support shaft (6), the second support shaft (6) and the first support shaft (2) are respectively rotatably connected to the two axial ends of the drum (1); the second support shaft (6) is fixedly connected to the motor (4) and is axially provided with a wire outlet hole.

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