Ultrahigh-speed gear speed increaser with efficient lubricating system

Abstract

The invention relates to an ultra-high-speed gear speed increaser with an efficient lubricating system. The ultra-high-speed gear speed increaser comprises a low-speed shaft assembly, a middle shaft assembly and a high-speed shaft assembly which are in transmission connection to an upper box body and a lower box body, and an oil tank connected to the lower box body. A middle small gear in the middle shaft assembly is meshed with a low-speed large gear in the low-speed shaft assembly in a helical tooth mode, and a high-speed small gear in the high-speed shaft assembly is meshed with a middle large gear in the middle shaft assembly in a helical tooth mode; each shaft assembly adopts a specific bearing supporting framework, so that excellent stability and bearing capacity are ensured during ultra-high-speed operation, each shaft only has two bearings to bear radial force due to the arrangement mode of the bearings of the speed increaser, the friction loss is reduced, and the service life of the system is prolonged; an efficient lubricating system is adopted, gear and bearing lubrication is ensured through an oil supply channel, an oil return groove and an oil nozzle, friction heat is reduced, and reliability and transmission efficiency are improved; the problems that an existing speed increaser is insufficient in lubrication under the ultra-high-speed working condition, bearing stress is complex, the service life is shortened, and the overall transmission efficiency is limited are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of speed increasers, and relates to an ultra-high speed gear speed increaser with an efficient lubrication system. Background Art

[0002] In the fields of precision machinery, energy equipment, high-end manufacturing, and high-speed transmission, ultra-high speed gear speed increasers are a type of key power transmission device, widely used in turbomachinery, power generation equipment, high-speed machine tools, and other high-speed industrial equipment. Its main function is to convert the low-speed and high-torque motion of the input shaft into the high-speed and low-torque motion of the output shaft to meet the requirements of the equipment for high-speed transmission.

[0003] However, with the development of high-speed transmission technology, traditional speed increasers have exposed many problems under high-speed and high-load working conditions, such as insufficient structural compactness, difficulties in lubrication and heat dissipation, limited bearing load-carrying capacity, and vibration and noise caused by changes in gear meshing stiffness. In addition, it is difficult to optimize the oil supply and sealing systems. How to ensure the uniformity of lubrication and the effective return of oil is still a difficult point in the design of speed increasers. Therefore, it is necessary to propose a new type of ultra-high speed gear speed increaser, which can achieve a more compact structure, a more efficient lubrication design, and a more reliable bearing support system while ensuring a high speed ratio and transmission efficiency, so as to improve the service life and overall performance of the speed increaser and meet the requirements of high-speed transmission equipment. Summary of the Invention

[0004] In view of this, in order to solve the problems that in the high-speed and high-load working conditions of the existing ultra-high speed gear speed increaser, there will be large vibrations caused by changes in gear meshing stiffness, low gear transmission efficiency, and poor stability of the entire speed increaser, resulting in a short service life of the speed increaser, poor overall performance, and inability to meet the requirements of high-speed transmission equipment, the present invention provides an ultra-high speed gear speed increaser with an efficient lubrication system, and its structural design aims to improve the transmission efficiency of the system, enhance stability, and optimize lubrication and heat dissipation performance to ensure efficient and reliable operation under extreme working conditions.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An ultra-high speed gear speed increaser with an efficient lubrication system, including a fixedly connected upper box body and a lower box body, a low-speed shaft assembly, an intermediate shaft assembly, and a high-speed shaft assembly that are sequentially connected by helical gear transmission, and an oil tank connected to the lower box body, realizing the two-stage speed increasing function of the speed increaser;

[0007] The low-speed shaft assembly includes a low-speed shaft and a large low-speed gear fixedly mounted on the low-speed shaft. The intermediate shaft assembly includes an intermediate shaft and a small intermediate gear and a large intermediate gear fixedly mounted on the intermediate shaft. The small intermediate gear meshes with the large low-speed gear in a helical manner. The intermediate shaft assembly adopts the same three-stage bearing support structure as the low-speed shaft assembly. The high-speed shaft assembly includes a high-speed shaft and a small high-speed gear fixedly mounted on the high-speed shaft. The small high-speed gear meshes with the large intermediate gear in a helical manner.

[0008] Further, the upper part of the low-speed shaft is installed in the upper box body through a third bearing to achieve rotation. The lower part of the low-speed shaft is successively and serially installed with a first bearing and a second bearing from bottom to top. The lower part of the low-speed shaft is installed in the lower box body through the first bearing and the second bearing to achieve rotation. The upper part of the intermediate shaft is installed in the upper box body through a sixth bearing to achieve rotation. The lower part of the intermediate shaft is successively and serially installed with a fourth bearing and a fifth bearing from bottom to top. The lower part of the intermediate shaft is installed in the lower box body through the fourth bearing and the fifth bearing to achieve rotation. The upper part of the high-speed shaft is successively and serially installed with a ninth bearing and an eighth bearing from top to bottom. The upper part of the high-speed shaft is installed in the upper box body through the ninth bearing and the eighth bearing to achieve rotation. The lower part of the high-speed shaft is installed in the lower box body through a seventh bearing.

[0009] Further, the third bearing is a cylindrical roller bearing and is installed on the upper side of the low-speed shaft. The first bearing and the second bearing are angular contact ball bearings and are mounted back-to-back on the lower side of the low-speed shaft. The sixth bearing is a cylindrical roller bearing and is installed on the upper side of the intermediate shaft. The fourth bearing and the fifth bearing are angular contact ball bearings and are mounted back-to-back on the lower side of the intermediate shaft. The ninth bearing and the eighth bearing are angular contact ball bearings and are mounted back-to-back on the upper side of the high-speed shaft. The seventh bearing is a cylindrical roller bearing and is installed on the lower side of the high-speed shaft.

[0010] Further, there is a gap between the outer ring of the second bearing and the lower box body to allow it to bear the axial force vertically upward. The first bearing and the third bearing bear the radial force to ensure that only two bearings of the low-speed shaft bear the radial force. There is a gap between the outer ring of the fifth bearing and the lower box body to allow it to bear the axial force vertically downward. The fourth bearing and the sixth bearing bear the radial force to ensure that only two bearings of the intermediate shaft bear the radial force. There is a gap between the outer ring of the eighth bearing of the high-speed shaft and the upper box body to allow it to bear the axial force vertically upward. The seventh bearing and the ninth bearing with a longer span bear the radial force.

[0011] Further, a low-speed oil guide ring is installed on the low-speed shaft between the first bearing and the second bearing. The first bearing and the second bearing are lubricated through the low-speed oil guide ring. A low-speed open-ended cover fixedly connected to the lower box body is installed on the low-speed shaft outside the first bearing. The low-speed oil guide ring is pressed on the low-speed shaft through the low-speed open-ended cover, and the low-speed open-ended cover is fixedly connected to the lower box body. A low-speed solid end cover fixedly connected to the upper box body is installed on the low-speed shaft outside the third bearing. The third bearing is pressed on the low-speed shaft through the low-speed solid end cover, and the low-speed solid end cover is fixedly connected to the upper box body.

[0012] Further, an intermediate oil guiding ring is installed on the intermediate shaft between the fourth bearing and the fifth bearing. The fourth bearing and the fifth bearing are lubricated through the intermediate oil guiding ring. An intermediate open-ended cover fixedly connected to the lower housing is installed on the intermediate shaft outside the fourth bearing. The intermediate oil guiding ring is pressed onto the intermediate shaft through the intermediate open-ended cover, and the intermediate open-ended cover is fixedly connected to the lower housing. An intermediate solid end cover fixedly connected to the upper housing is installed on the intermediate shaft outside the sixth bearing. The sixth bearing is pressed onto the intermediate shaft through the intermediate solid end cover, and the intermediate solid end cover is fixedly connected to the upper housing.

[0013] Further, a high-speed upper oil guiding ring is installed on the high-speed shaft between the eighth bearing and the ninth bearing. The eighth bearing and the ninth bearing are lubricated through the high-speed upper oil guiding ring. A high-speed lower oil guiding ring is installed on the high-speed shaft above the seventh bearing. The seventh bearing is lubricated through the high-speed lower oil guiding ring. A high-speed open-ended cover fixedly connected to the lower housing is installed on the high-speed shaft outside the seventh bearing.

[0014] Further, a corrugated spring is sleeved on the high-speed shaft between the seventh bearing and the high-speed open-ended cover. The seventh bearing is pressed onto the high-speed shaft through the corrugated spring and the high-speed open-ended cover. The corrugated spring provides a continuous pre-tightening force for the seventh bearing and at the same time prevents the seventh bearing from being stuck due to the axial expansion of the high-speed shaft at high temperature.

[0015] Further, reinforcing ribs are provided inside both the upper housing and the lower housing. Oil supply channels are opened inside the reinforcing ribs for lubricating the gear and bearing assemblies. Bearing seats for fixing the corresponding bearings are provided on both the upper housing and the lower housing, and oil return grooves are opened at the bearing seats. Four gear oil nozzles are installed on the top of the upper housing, and oil injection holes are provided on the outside.

[0016] The cooperation of the oil supply channels and the oil return grooves is used to transport lubricating oil to the gear pair and the bearing assemblies. The four gear oil nozzles are used to ensure that the gear meshing points are fully lubricated, reducing friction and wear.

[0017] Further, the low-speed oil guiding ring, the intermediate oil guiding ring, the high-speed lower oil guiding ring, and the high-speed upper oil guiding ring have the same structure, and each includes a sealing groove, an oil guiding hole, a bearing oil injection hole, and a bearing oil drain groove. The sealing grooves are circumferentially provided at the upper and lower ends of the corresponding oil guiding rings. The oil guiding holes are evenly distributed along the circumference of the corresponding oil guiding rings and extend from the outer circumferential surface towards the axis direction. The bearing oil injection holes are communicated with the radially arranged oil guiding holes and penetrate the axis of the corresponding oil guiding rings for guiding the oil flow along the axis to ensure that the lubricating oil can effectively cover the bearing rolling elements, reducing friction and improving the durability of the bearings. The bearing oil drain grooves are evenly opened at the bottom of the corresponding oil guiding rings and are communicated with the oil guiding holes to facilitate the return of the oil after lubrication.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. A super-high-speed gear speed increaser with an efficient lubrication system disclosed by the present invention adopts an accurately optimized bearing support scheme. The low-speed shaft, intermediate shaft, and high-speed shaft all adopt a two-point support design. By reasonably reserving bearing clearances, it is ensured that each shaft is only supported by two bearings to bear the radial force. Compared with traditional multi-point support structures (such as three-point or four-point support), the traditional structure has more fit errors due to more clearances between bearings, which will cause additional additional binding forces, making the bearings bear greater unnecessary loads, thus increasing bearing heat generation and wear and reducing the system efficiency. However, the present invention reduces the additional load by reasonably optimizing the support method, improves the bearing force balance, enables the entire speed increaser to effectively reduce the bearing friction loss under super-high-speed operating conditions, and improves the rotation accuracy and service life of the speed increaser.

[0020] 2. A super-high-speed gear speed increaser with an efficient lubrication system disclosed by the present invention adopts a lubrication system integrating an oil supply channel, an oil return groove, and a gear oil injector to achieve precise oil injection lubrication for the gear meshing points and bearings. Compared with traditional lubrication methods (such as oil bath lubrication or splash lubrication), traditional methods may have problems such as uneven lubricating oil distribution, lubrication lag, or local overheating during super-high-speed operation. The present invention uses the multi-channel design of the oil guiding ring to enable the lubricating oil to quickly cover the key friction parts, and efficiently return to the oil tank through the oil drain groove and the oil return channel to form an efficient circulating lubrication system, thereby ensuring the stable supply of lubricating oil under high-speed conditions, reducing the friction heat of the gear pair and bearings, improving the heat dissipation efficiency, avoiding system failure caused by lubricating oil accumulation and excessive temperature, and ensuring that the speed increaser remains stable and reliable during long-term super-high-speed operation.

[0021] 3. A super-high-speed gear speed increaser with an efficient lubrication system disclosed by the present invention adopts a compact and efficient structural design. Reinforcing ribs and bearing seats are arranged inside the upper and lower boxes. The oil supply channel is integrated inside the reinforcing ribs, and the oil return groove is opened at the bearing seat, so that the oil supply channel and the oil return groove are efficiently integrated inside the upper and lower boxes, enabling the speed increaser to be compact while meeting the high-speed requirements, reducing the extra weight, effectively improving the overall stiffness of the box body, and reducing the vibration and deformation during super-high-speed operation.

[0022] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0024] Figure 1 Structural schematic diagram of the ultra-high speed gear speed increaser with an efficient lubrication system according to the present invention;

[0025] Figure 2 According to the present invention Figure 1 Structural schematic diagram of the middle gear shaft assembly;

[0026] Figure 3 According to the present invention Figure 1 Structural schematic diagram of the lower box body;

[0027] Figure 4 According to the present invention Figure 1 Structural schematic diagram of the upper box body;

[0028] Figure 5 According to the present invention Figure 1 Structural schematic diagram of the middle oil guiding ring;

[0029] Reference numerals: low-speed shaft assembly 1, low-speed shaft 11, low-speed large gear 12, low-speed open-end cover 13, first bearing 14, low-speed oil guiding ring 15, sealing groove 151, oil guiding hole 152, bearing oil injection hole 153, bearing oil drain groove 154, second bearing 16, third bearing 17, low-speed solid end cover 18, intermediate shaft assembly 2, intermediate shaft 21, intermediate small gear 22, intermediate large gear 23, intermediate open-end cover 24, fourth bearing 25, intermediate oil guiding ring 26, fifth bearing 27, sixth bearing 28, intermediate solid end cover 29, high-speed shaft assembly 3, high-speed shaft 31, high-speed small gear 32, high-speed open-end cover 33, corrugated spring 34, seventh bearing 35, high-speed lower oil guiding ring 36, eighth bearing 37, high-speed upper oil guiding ring 38, ninth bearing 39, lower box body 4, oil supply channel 41, oil return groove 42, upper box body 5, oil injection hole 51, gear oil injector 52, oil tank 6. Specific embodiments

[0030] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0031] As Figures 1-2 shown, an ultra-high speed gear speed increaser with an efficient lubrication system. The ultra-high speed gear speed increaser is installed vertically. The lower end of the low-speed shaft is connected to the power source, and the upper end of the high-speed shaft is connected to the load. Through a two-stage helical gear transmission system, efficient speed increasing transmission between the low-speed shaft and the high-speed shaft is achieved.

[0032] This ultra-high-speed gear speed increaser includes an upper housing 5, a lower housing 4, a low-speed shaft assembly 1, an intermediate shaft assembly 2, a high-speed shaft assembly 3, and an oil tank 6 connected to the lower housing 4. The upper housing 5 and the lower housing 4 are fixed together by a plurality of bolts. The bolts are usually evenly distributed around the housing to ensure the firmness and uniformity of the connection. The low-speed shaft assembly 1 is drivingly connected to the intermediate shaft assembly 2, and the intermediate shaft assembly 2 is drivingly connected to the high-speed shaft assembly 3 to achieve the two-stage speed increasing function of the speed increaser. The gear system formed by the low-speed shaft assembly 1, the intermediate shaft assembly 2, and the high-speed shaft assembly 3 adopts a helical gear transmission method. The helical gear design helps to reduce the impact load, improve the transmission smoothness, and enhance the load-bearing capacity.

[0033] Specifically, the low-speed shaft assembly 1 includes a low-speed shaft 11 and a low-speed large gear 12 fixedly installed on the low-speed shaft 11. The low-speed shaft assembly adopts a three-stage bearing support structure. The upper part of the low-speed shaft 11 is installed in the upper housing 5 through a third bearing 17 to achieve rotation. The third bearing 17 is a cylindrical roller bearing and is installed on the upper side of the low-speed shaft 11. The lower part of the low-speed shaft 11 is successively installed with a first bearing 14 and a second bearing 16 from bottom to top. The lower part of the low-speed shaft 11 is installed in the lower housing 4 through the first bearing 14 and the second bearing 16 to achieve rotation. The first bearing 14 and the second bearing 16 are angular contact ball bearings and are installed back-to-back on the lower side of the low-speed shaft 11. A low-speed oil guide ring 15 is installed on the low-speed shaft 11 between the first bearing 14 and the second bearing 16. The first bearing 14 and the second bearing 16 are lubricated through the low-speed oil guide ring 15. A low-speed open-end cover 13 fixedly connected to the lower housing 4 is installed on the low-speed shaft 11 outside the first bearing 14. The low-speed oil guide ring 15 is pressed against the low-speed shaft 11 through the low-speed open-end cover 13. The low-speed open-end cover 13 is circumferentially and evenly provided with threaded holes. The low-speed open-end cover 13 and the lower housing 4 are fixedly connected by inserting appropriate bolt fasteners into the threaded holes. Similarly, a low-speed solid end cover 18 fixedly connected to the upper housing 5 is installed on the low-speed shaft 11 outside the third bearing 17. The third bearing 17 is pressed against the low-speed shaft 11 through the low-speed solid end cover 18 to ensure the stability of axial positioning. The low-speed solid end cover 18 is circumferentially and evenly provided with threaded holes. The low-speed solid end cover 18 and the upper housing 5 are fixedly connected by inserting appropriate bolt fasteners into the threaded holes.

[0034] The intermediate shaft assembly 2 includes an intermediate shaft 21, a small intermediate gear 22 and a large intermediate gear 23 fixedly mounted on the intermediate shaft 21. The small intermediate gear 22 is helically meshed with the large low-speed gear 12. The intermediate shaft assembly 2 adopts the same bearing support structure as the low-speed shaft assembly 1. The upper part of the intermediate shaft 21 is mounted in the upper housing 5 through a sixth bearing 28 for rotation. The sixth bearing 28 is a cylindrical roller bearing. The lower part of the intermediate shaft 21 is successively and serially mounted with a fourth bearing 25 and a fifth bearing 27 from bottom to top. The lower part of the intermediate shaft 21 is mounted in the lower housing 4 through the fourth bearing 25 and the fifth bearing 27 for rotation. The fourth bearing 25 and the fifth bearing 27 are angular contact ball bearings, which are mounted back-to-back on the lower side of the intermediate shaft 21. An intermediate oil guide ring 26 is mounted on the intermediate shaft 21 between the fourth bearing 25 and the fifth bearing 27. The fourth bearing 25 and the fifth bearing 27 are lubricated through the intermediate oil guide ring 26. An intermediate open-ended cover 24 fixedly connected to the lower housing 4 is mounted on the intermediate shaft 21 outside the fourth bearing 25. The intermediate oil guide ring 26 is pressed against the intermediate shaft 21 through the intermediate open-ended cover 24. The intermediate open-ended cover 24 is fixedly connected to the lower housing 4. Similarly, an intermediate solid end cover 29 fixedly connected to the upper housing 5 is mounted on the intermediate shaft 21 outside the sixth bearing 28. The sixth bearing 28 is pressed against the intermediate shaft 21 through the intermediate solid end cover 29. The intermediate solid end cover 29 is fixedly connected to the upper housing 5.

[0035] The high-speed shaft assembly 3 includes a high-speed shaft 31 and a small high-speed gear 32 fixedly mounted on the high-speed shaft 31. The small high-speed gear 32 is helically meshed with the large intermediate gear 23. The upper part of the high-speed shaft 31 is successively and serially mounted with a ninth bearing 39 and an eighth bearing 37 from top to bottom. The ninth bearing 39 and the eighth bearing 37 are angular contact ball bearings, which are mounted back-to-back on the upper side of the high-speed shaft 31. The upper part of the high-speed shaft 31 is mounted in the upper housing 5 through the ninth bearing 39 and the eighth bearing 37 for rotation. A high-speed upper oil guide ring 38 is mounted on the high-speed shaft 31 between the eighth bearing 37 and the ninth bearing 39. The eighth bearing 37 and the ninth bearing 39 are lubricated through the high-speed upper oil guide ring 38. The lower part of the high-speed shaft 31 is mounted in the lower housing 4 through a seventh bearing 35 for rotation. The seventh bearing 35 is a cylindrical roller bearing. A high-speed lower oil guide ring 36 is mounted on the high-speed shaft 31 above the seventh bearing 35. The seventh bearing 35 is lubricated through the high-speed lower oil guide ring 36. A high-speed open-ended cover 33 fixedly connected to the lower housing 4 is mounted on the high-speed shaft 31 outside the seventh bearing 35. A corrugated spring 34 is sleeved on the high-speed shaft 31 between the seventh bearing 35 and the high-speed open-ended cover 33. The seventh bearing 35 is pressed against the high-speed shaft 31 through the corrugated spring 34 and the high-speed open-ended cover 33. The corrugated spring 34 provides a continuous pre-tightening force for the seventh bearing 35 and at the same time prevents the seventh bearing 35 from being stuck due to the axial expansion of the high-speed shaft 31 at high temperature.

[0036] For this ultra-high-speed gear speed increaser, according to the direction of the axial force on the low-speed shaft, there is a gap between the outer ring of the second bearing 16 and the lower housing 4, allowing it to bear the vertically upward axial force. The first bearing 14 and the third bearing 17 bear the radial force, ensuring that only two bearings bear the radial force of the low-speed shaft 11, thus avoiding virtual constraints and ensuring the service life. The principle of the intermediate shaft 21 is similar to that of the low-speed shaft 11. There is a gap between the outer ring of the fifth bearing 27 and the lower housing 4, allowing it to bear the vertically downward axial force. The fourth bearing 25 and the sixth bearing 28 bear the radial force, ensuring that only two bearings bear the radial force of the intermediate shaft 21, thus avoiding virtual constraints and ensuring the service life. In the high-speed shaft 31, there is a gap between the outer ring of the eighth bearing 37 and the upper housing 5, allowing it to bear the vertically upward axial force. The seventh bearing 35 and the ninth bearing 39 with a longer span bear the radial force.

[0037] The gear system adopts a helical gear drive mode. The low-speed large gear 12, the intermediate small gear 22, the intermediate large gear 23, and the high-speed small gear 32 are all helical gears. The low-speed large gear 12 meshes with the intermediate small gear 22, and the intermediate large gear 23 meshes with the high-speed small gear 32. The helical gear design helps to reduce the impact load, improve the transmission smoothness, and enhance the load-carrying capacity.

[0038] As Figures 3-4 shown, both the upper housing 5 and the lower housing 4 of this ultra-high-speed gear speed increaser are provided with reinforcing ribs inside. Oil supply channels 41 are opened inside the reinforcing ribs for lubricating the gear and bearing assemblies. Bearing seats for fixing the corresponding bearings are provided on both the upper housing 5 and the lower housing 4, and oil return grooves 42 are opened at the bearing seats. In addition to having similar reinforcing ribs, oil supply channels 41, and oil return grooves 42 as the lower housing 4 inside the upper housing 5, four gear oil nozzles 52 are additionally installed on the top, and oil injection holes 51 are opened on the outside. The cooperation of the oil supply channels 41 and the oil return grooves 42 is used to deliver lubricating oil to the gear pair and the bearing assembly. The four gear oil nozzles 52 are used to ensure that the gear meshing points are fully lubricated, reduce friction and wear, and at the same time introduce the lubricating oil into the bearing area through each oil guiding ring.

[0039] As Figure 5 shown, the structures of the low-speed oil guiding ring 15, the intermediate oil guiding ring 26, the high-speed lower oil guiding ring 36, and the high-speed upper oil guiding ring 38 are the same, and each includes a sealing groove 151, an oil guiding hole 152, a bearing oil injection hole 153, and a bearing oil drain groove 154. The sealing groove 151 is circumferentially opened at the upper and lower ends of the corresponding oil guiding ring. The oil guiding holes 152 are evenly distributed along the circumference of the corresponding oil guiding ring and extend from the outer circumferential surface towards the axis direction. The bearing oil injection hole 153 is communicated with the radially arranged oil guiding hole 152 and penetrates the axis of the corresponding oil guiding ring for guiding the oil fluid to flow axially, ensuring that the lubricating oil can effectively cover the bearing rolling elements, reducing friction, and improving the durability of the bearing. The bearing oil drain grooves 154 are evenly opened at the bottom of the corresponding oil guiding ring and are communicated with the oil guiding holes 152 to facilitate the return of the oil fluid after lubrication.

[0040] The lubricating oil enters the upper housing 5 through the oil injection hole 51 and flows along the oil supply passage 41 inside the housing to the gear oil injector 52 and each oil guiding ring. The lubricating oil at the gear meshing point returns by gravity, and the lubricating oil at the bearing returns along the bearing oil drain groove 154 on the oil guiding ring and the oil return groove 42 on the housing, and finally flows back to the oil tank 6 through the low-speed open-end cover 13, the middle open-end cover 24, and the high-speed open-end cover 33, realizing an efficient lubrication and heat dissipation cycle.

[0041] The working principle of this ultra-high-speed gear speed increaser is as follows: The low-speed shaft 11 rotates to drive the low-speed large gear 12 to rotate. The low-speed large gear 12 meshes with the intermediate small gear 22, and the intermediate small gear 22 drives the intermediate shaft 21 to rotate. The intermediate shaft 21 drives the intermediate large gear 23 to rotate. The intermediate large gear 23 meshes with the high-speed small gear 32, and the high-speed small gear 32 drives the high-speed shaft 31 to rotate. The high-speed shaft 31 is connected to an external machine, achieving the effect of speed increase.

[0042] The ultra-high-speed gear speed increaser of the present invention has a compact structure, with an overall weight of about 50 kg and an output speed that can reach 50,000 rpm, making it very suitable for precision equipment that requires high speeds, such as turbomachinery, power generation equipment, and high-speed machine tools.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An ultra-high speed gear speed increaser with an efficient lubrication system, characterized in that: It comprises an upper housing (5), a lower housing (4) which are fixedly connected, a low-speed shaft assembly (1), an intermediate shaft assembly (2), a high-speed shaft assembly (3) which are sequentially connected by helical gear transmission, and an oil tank (6) connected to the lower housing (4), so as to realize the two-stage speed increasing function of the speed increaser; The low-speed shaft assembly (1) comprises a low-speed shaft (11) and a low-speed large gear (12) fixedly mounted on the low-speed shaft (11); the intermediate shaft assembly (2) comprises an intermediate shaft (21) and an intermediate pinion (22) fixedly mounted on the intermediate shaft (21), and an intermediate large gear (23); the intermediate pinion (22) is helically meshed with the low-speed large gear (12); the intermediate shaft assembly (2) adopts the same three-stage bearing support structure as the low-speed shaft assembly (1); the high-speed shaft assembly (3) comprises a high-speed shaft (31) and a high-speed pinion (32) fixedly mounted on the high-speed shaft (31); the high-speed pinion (32) is helically meshed with the intermediate large gear (23).

2. The ultra-high speed gear speed increaser according to claim 1, characterized in that: The upper portion of the low-speed shaft (11) is mounted in the upper housing (5) via a third bearing (17) to achieve rotation; the lower portion of the low-speed shaft (11) is serially mounted with a first bearing (14) and a second bearing (16) from bottom to top; the lower portion of the low-speed shaft (11) is mounted in the lower housing (4) via the first bearing (14) and the second bearing (16) to achieve rotation; the upper portion of the intermediate shaft (21) is mounted in the upper housing (5) via a sixth bearing (28) to achieve rotation; the lower portion of the intermediate shaft (21) is serially mounted with a fourth bearing (29) from bottom to top The lower part of the intermediate shaft (21) is installed in the lower housing (4) through the fourth bearing (25) and the fifth bearing (27) to achieve rotation; the upper part of the high-speed shaft (31) is installed in series with the ninth bearing (39) and the eighth bearing (37) from top to bottom, the upper part of the high-speed shaft (31) is installed in the upper housing (5) through the ninth bearing (39) and the eighth bearing (37) to achieve rotation, and the lower part of the high-speed shaft (31) is installed in the lower housing (4) through the seventh bearing (35) to achieve rotation.

3. The ultra-high speed gear speed increaser according to claim 2, characterized in that: The third bearing (17) is a cylindrical roller bearing mounted on the upper side of the low-speed shaft (11); the first bearing (14) and the second bearing (16) are angular contact ball bearings mounted back-to-back on the lower side of the low-speed shaft (11); the sixth bearing (28) is a cylindrical roller bearing mounted on the upper side of the intermediate shaft (21); the fourth bearing (25) and the fifth bearing (27) are angular contact ball bearings mounted back-to-back on the lower side of the intermediate shaft (21); the ninth bearing (39) and the eighth bearing (37) are angular contact ball bearings mounted back-to-back on the upper side of the high-speed shaft (31); and the seventh bearing (35) is a cylindrical roller bearing mounted on the lower side of the high-speed shaft (31).

4. The ultra-high speed gear speed increaser according to claim 2, characterized in that: A gap is left between the outer ring of the second bearing (16) and the lower housing (4) to allow it to bear a vertical upward axial force, and the first bearing (14) and the third bearing (17) bear a radial force, thereby ensuring that the low-speed shaft (11) is borne radial force by only two bearings; a gap is left between the outer ring of the fifth bearing (27) and the lower housing (4) to allow it to bear a vertical downward axial force, and the fourth bearing (25) and the sixth bearing (28) bear a radial force, thereby ensuring that the intermediate shaft (21) is borne radial force by only two bearings; a gap is left between the outer ring of the eighth bearing (37) in the high-speed shaft (31) and the upper housing (5) to allow it to bear a vertical upward axial force, and the seventh bearing (35) and the ninth bearing (39) with a longer span bear radial force.

5. The ultra-high speed gear speed increaser according to claim 2, characterized in that: A low-speed oil guide ring (15) is installed on the low-speed shaft (11) between the first bearing (14) and the second bearing (16), and the first bearing (14) and the second bearing (16) are lubricated by the low-speed oil guide ring (15). A low-speed perforated end cover (13) fixedly connected to the lower housing (4) is installed on the low-speed shaft (11) outside the first bearing (14), and the low-speed oil guide ring (15) is pressed onto the low-speed shaft (11) through the low-speed perforated end cover (13), and the low-speed perforated end cover (13) is fixedly connected to the lower housing (4); a low-speed solid end cover (18) fixedly connected to the upper housing (5) is installed on the low-speed shaft (11) outside the third bearing (17), and the third bearing (17) is pressed onto the low-speed shaft (11) through the low-speed solid end cover (18), and the low-speed solid end cover (18) is fixedly connected to the upper housing (5).

6. The ultra-high speed gear speed increaser according to claim 5, characterized in that: An intermediate oil guide ring (26) is installed on the intermediate shaft (21) between the fourth bearing (25) and the fifth bearing (27), and the fourth bearing (25) and the fifth bearing (27) are lubricated by the intermediate oil guide ring (26). An intermediate hole end cover (24) fixedly connected to the lower housing (4) is installed on the intermediate shaft (21) outside the fourth bearing (25), and the intermediate oil guide ring (26) is pressed onto the intermediate shaft (21) through the intermediate hole end cover (24), and the intermediate hole end cover (24) is fixedly connected to the lower housing (4); an intermediate solid end cover (29) fixedly connected to the upper housing (5) is installed on the intermediate shaft (21) outside the sixth bearing (28), and the sixth bearing (28) is pressed onto the intermediate shaft (21) through the intermediate solid end cover (29), and the intermediate solid end cover (29) is fixedly connected to the upper housing (5).

7. The ultra-high speed gear speed increaser according to claim 6, characterized in that: A high-speed upper oil guide ring (38) is installed on the high-speed shaft (31) between the eighth bearing (37) and the ninth bearing (39), and the eighth bearing (37) and the ninth bearing (39) are lubricated by the high-speed upper oil guide ring (38). A high-speed lower oil guide ring (36) is installed on the high-speed shaft (31) on the upper side of the seventh bearing (35), and the seventh bearing (35) is lubricated by the high-speed lower oil guide ring (36). A high-speed perforated end cover (33) fixedly connected to the lower housing (4) is installed on the high-speed shaft (31) outside the seventh bearing (35).

8. The ultra-high speed gear speed increaser according to claim 7, characterized in that: A corrugated spring (34) is mounted on the high-speed shaft (31) between the seventh bearing (35) and the high-speed perforated end cover (33). The seventh bearing (35) is pressed against the high-speed shaft (31) by the corrugated spring (34) and the high-speed perforated end cover (33). The corrugated spring (34) provides a continuous preload force for the seventh bearing (35) and prevents the seventh bearing (35) from getting stuck due to axial expansion of the high-speed shaft (31) at high temperature.

9. The ultra-high speed gear speed increaser according to claim 2, characterized in that: The upper box body (5) and the lower box body (4) are both provided with reinforcing ribs, and an oil supply channel (41) is provided inside the reinforcing ribs for lubricating the gear and bearing assembly. The upper box body (5) and the lower box body (4) are both provided with bearing seats for fixing corresponding bearings, and an oil return groove (42) is provided at the bearing seats. Four gear oil spray nozzles (52) are installed on the top of the upper box body (5), and an oil injection hole (51) is provided on the outer side.

10. The ultra-high speed gear speed increaser according to claim 7, characterized in that: The low-speed oil guide ring (15), the intermediate oil guide ring (26), the high-speed lower oil guide ring (36), and the high-speed upper oil guide ring (38) have the same structure, and all include a sealing groove (151), an oil guide hole (152), a bearing oil spray hole (153), and a bearing oil drain groove (154). The sealing groove (151) is circumferentially arranged at the upper and lower ends of the corresponding oil guide ring. The oil guide holes (152) are evenly distributed along the circumference of the corresponding oil guide ring and extend from the outer circumferential surface toward the axial direction. The bearing oil spray hole (153) is communicated with the radially arranged oil guide hole (152) and penetrates the axial direction of the corresponding oil guide ring to guide the oil to flow in the axial direction. The bearing oil drain groove (154) is evenly arranged at the bottom of the corresponding oil guide ring and communicates with the oil guide hole (152).

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