Stepped planetary gearset lubrication system and lubrication method

Abstract

A stepped planetary gearset lubrication system and a lubrication method. The stepped planetary gearset lubrication system comprises a housing (7), and an input shaft (11), a planetary gearset and a planetary carrier, which penetrate the housing (7), wherein a side wall of the planetary carrier consists of several spraying portions (51) arranged at intervals in a circumferential direction. The spraying portions (51) can spray lubricating oil onto a sun gear (23) and a planetary gear, and the lubricating oil is evenly applied by means of the meshing between the sun gear (23), the planetary gear and a ring gear (6). On the basis of the arrangements of a first oil catch ring (4) and a first axial oil channel (13), a first radial oil channel (14), a second axial oil channel (16) and second radial oil channels (17), a fixed bearing of an output shaft (1), support bearings of the planetary carrier, and the planetary gear, the sun gear (23) and the ring gear (6) are lubricated.

Description

Lubricating system and method for stepped planetary gear set TECHNICAL FIELD

[0001] The present application relates to the technical field of planetary reduction, in particular to a lubricating system and method for stepped planetary gear set. BACKGROUND

[0002] In the electric drive system using high-speed motor, a large speed ratio reduction mechanism is needed to ensure that the output speed of the electric drive system meets the application requirements of the vehicle. The stepped planetary gear set can realize a high reduction ratio in a small volume. Active lubrication is an effective measure to realize the efficiency of the electric drive. It reduces the oil stirring loss by reducing the oil stirring amount of the gear, thereby reducing the power loss.

[0003] The existing planetary gear set lubricating system using active lubrication (such as CN104358859A) supplies lubricating oil from the oil supply hole of the valve plate to the installation positions of the planetary gear and the gear ring, and the installation positions of the sun gear and the planet carrier through the oil supply hole and the oil guide pipe arranged on the gear inner hub, the sun gear and the planet carrier, to realize lubrication of the entire planetary gear set.

[0004] The active lubrication method of the existing planetary gear set lubricating system is only applicable to the parallel shaft meshing gear system with simple structure and matching method. However, for the gear system containing stepped planetary gears, the stepped planetary gears contain large end gear rings and small end gear rings. The large end gear ring and the small end gear ring are not coplanar, and are respectively meshed with the sun gear and the outer gear ring. Therefore, the overall structure and matching method of the planetary gear set are complex, and complex oil channels need to be machined on the planet carrier, the gear inner hub and the housing. The oil channel is difficult to machine and has high machining cost. In addition, the oil channel is arranged on the housing to realize oil supply, which has high sealing requirement and increases the risk of oil leakage. SUMMARY

[0005] To solve the technical problems of the existing planetary gear set active lubrication method for the stepped planetary gear set, i.e. the need to machine complex oil channels on the planet carrier and the gear inner hub, and the difficulty and high cost of machining the oil channels, the present application provides a lubricating system and method for stepped planetary gear set.

[0006] The technical scheme of the present application is as follows:

[0007] The present application provides a lubricating system for stepped planetary gear set, which comprises a housing and an input shaft penetrating the housing, and further comprises:

[0008] A planetary gear set comprising a sun gear, a planetary gear and an outer gear ring meshing in sequence. The sun gear is fixedly connected to the input shaft, the outer gear ring is fixedly arranged on the housing, and the planetary gear is rotatably arranged on the wheel shaft.

[0009] The planet carrier is arranged to rotate in the housing, the wheel shafts of the planet gears are fixedly arranged in the planet carrier, the side wall of the planet carrier is composed of a plurality of spray parts arranged at intervals in the circumferential direction, there is a space allowing the planet gears to be exposed between adjacent spray parts, the spray part comprises a second axial oil channel, a plurality of second radial oil channels are arranged on the inner side of the spray part, the second axial oil channel and the second radial oil channels are communicated, the spray part can spray lubricating oil onto the sun gear, the planet gears and the outer gear ring, and the lubricating oil is uniformly coated through the meshing between the sun gear, the planet gears and the outer gear ring;

[0010] The output shaft penetrates the housing at one end and is connected with the planet carrier at the other end, the first axial oil channel is arranged in the output shaft, a plurality of first radial oil channels are arranged on the side wall of the output shaft, the first radial oil channels and the first axial oil channel are communicated, and the first radial oil channels are close to the support bearings at one end of the planet carrier;

[0011] The first oil receiving ring is inserted at one end of the planet carrier close to the output shaft, and is used for receiving the lubricating oil of the support bearings and guiding the lubricating oil into the second axial oil channel. Based on the arrangement of the first oil receiving ring and the first axial oil channel, the first radial oil channel, the second axial oil channel and the second radial oil channel, the lubrication of the fixed bearings of the output shaft, the support bearings of the planet carrier and the sun gear, the planet gears and the outer gear ring is realized. The arrangement of the first oil receiving ring does not need to open complex oil channels on the housing and the gear inner hub, simplifies the oil channel structure on the planet carrier, reduces the processing difficulty, and ensures the sealing of the housing.

[0012] Preferably, the input shaft is coaxially arranged with the output shaft, the third axial oil channel is arranged in the input shaft, the third axial oil channel is communicated with the first axial oil channel through the oil pipe, a plurality of third radial oil channels are arranged on the side wall of the input shaft, the third radial oil channels and the third axial oil channel are communicated, and the third radial oil channels are close to the support bearings at the other end of the planet carrier. Based on the arrangement of the oil pipe between the output shaft and the input shaft, the oil channel connection of the input shaft and the output shaft is realized, the third radial oil channels can be used to spray lubricating oil to lubricate the support bearings at the other end of the planet carrier and the fixed bearings of the input shaft.

[0013] Preferably, one end of the oil pipe is in interference fit with the first axial oil channel, and the other end of the oil pipe is in clearance fit with the third axial oil channel. The lubricating oil can flow between the input shaft and the output shaft without leakage, the input shaft is prevented from directly driving the output shaft to rotate around the shaft, and the rotation speed of the oil pipe is low, so that the connection is more stable.

[0014] Preferably, the sum of the cross-sectional areas of the first radial oil channels is not less than the sum of the cross-sectional areas of the third radial oil channels, so as to ensure that sufficient lubricating oil is delivered to the sun gear, the planet gears, the outer gear ring and the support bearings for lubrication.

[0015] Preferably, the first oil receiving ring comprises an annular oil receiving part, the support bearing is located in the range enclosed by the inner ring of the oil receiving part, the oil receiving part is hollow inside, the inner ring of the oil receiving part is open, a plurality of oil guiding parts are fixedly arranged on the outer ring in intervals, the diameter of the opening on the side wall of the oil receiving part close to the planet carrier is smaller than the diameter of the opening on the other side, the oil guiding part is a tubular structure, one end of the oil guiding part is open, and the other end is communicated with the inside of the oil receiving part, so as to facilitate the receiving and guiding of the lubricating oil of the support bearing to the specified position.

[0016] Preferably, a lip is fixedly arranged at the inner ring of the oil receiving part, the lip is arranged in a ring direction, the oil receiving part is in contact with the side wall of the planet carrier through the lip, the contact area between the oil receiving part and the side wall of the planet carrier is reduced, and the connection sealing property between the two is improved.

[0017] Preferably, a second oil receiving ring is inserted at one end of the planet carrier close to the input shaft, the second oil receiving ring is the same in structure as the first oil receiving ring, the oil receiving part of the second oil receiving ring is used for receiving the lubricating oil of the third radial oil channel thrown to the support bearing, and the oil guiding part of the second oil receiving ring is inserted in the wheel shaft of the planet gear, so that the setting of a complex oil channel is avoided, the lubricating oil can be directly received and guided through the second oil receiving ring, and the machining difficulty is effectively reduced.

[0018] Preferably, a fourth axial oil channel is arranged in the wheel shaft, the oil guiding part of the second oil receiving ring is inserted in the fourth axial oil channel, a fourth radial oil channel is arranged on the side wall of the wheel shaft, and the fourth radial oil channel is communicated with the fourth axial oil channel, based on the setting of the fourth axial oil channel and the fourth radial oil channel of the second oil receiving ring, the lubrication of the planet gear bearing is realized, the lubrication of all moving parts of the stepped planet gear train under the condition of a single oil source (dry oil pool state) is realized, the oil stirring loss of the stepped planet gear train is greatly reduced, the driving system efficiency is improved, the oil channel is simplified, and the setting of too many oil channels is avoided.

[0019] Preferably, the diameter of the second radial oil channel close to the input shaft is greater than that of the second radial oil channel close to the output shaft, so that sufficient lubricating oil is ensured for spraying the sun gear and the planet gear.

[0020] The application also provides a lubricating method, which specifically comprises the following steps: the lubricating oil is transported through the first axial oil channel in the output shaft, the lubricating oil in the first axial oil channel is divided into two paths, one path is guided to the spraying part through the first oil receiving ring, in the process of rotation of the planet carrier, the lubricating oil is sprayed onto the sun gear, the planet gear and the outer gear ring through the spraying part; the other path is transported to the input shaft through the oil pipe, is guided to the wheel shaft through the second oil receiving ring, and is transported to the bearing between the planet gear and the wheel shaft through the fourth radial oil channel, the lubrication of all moving parts of the stepped planet gear train under the condition of a single oil source (dry oil pool state) is realized, the oil stirring loss of the stepped planet gear train is greatly reduced, the driving system efficiency is improved, the oil channel is simplified, and the setting of too many oil channels is avoided.

[0021] The above technical solution can see that the present application has the advantages of:

[0022] 1. The spraying part can spray lubricating oil to the sun gear and the planet gear, and the lubricating oil is evenly coated through the meshing between the sun gear, the planet gear and the outer gear ring. Based on the arrangement of the first oil receiving ring and the first axial oil channel, the first radial oil channel, the second axial oil channel and the second radial oil channel, the lubrication of the fixed bearing of the output shaft, the supporting bearing of the planet carrier and the planet gear, the sun gear and the outer gear ring is realized. The first oil receiving ring is arranged, and the complex oil channel is not needed to be opened on the housing and the gear inner hub, the oil channel structure on the planet carrier is simplified, the machining difficulty is reduced, and the sealing of the housing is ensured.

[0023] 2. The third axial oil channel is communicated with the first axial oil channel through the oil passage pipe to ensure the communication of the oil channel path and realize the single oil source. One end of the oil passage pipe is in interference fit with the first axial oil channel, and the other end of the oil passage pipe is in clearance fit with the third axial oil channel. The lubricating oil flows between the input shaft and the output shaft without leakage, the input shaft is prevented from directly driving the output shaft to rotate around the shaft, and the rotation speed of the oil passage pipe is also ensured to be low, so that the connection is more stable.

[0024] 3. Through the arrangement of the first oil receiving ring and the first axial oil channel, the first radial oil channel, the second axial oil channel and the second radial oil channel, the lubrication of the fixed bearing of the output shaft, the first supporting bearing and the planet gear, the sun gear and the outer gear ring is realized. Through the arrangement of the second oil receiving ring, the third axial oil channel, the third radial oil channel, the fourth axial oil channel and the fourth radial oil channel, the lubrication of the fixed bearing of the input shaft, the second supporting bearing and the planet gear bearing is realized. Based on the single oil source, the lubrication of all moving parts of the planetary row under the condition of no oil pool is realized, which helps to greatly reduce the oil stirring loss of the planetary row, improve the driving system efficiency, simplify the oil channel, avoid the arrangement of too many oil channels, and reduce the machining difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a cross-sectional structure schematic diagram of the stepped planetary row lubricating system according to one or more embodiments of the present application;

[0027] Fig. 2 is a structure schematic diagram of the oil receiving ring according to one or more embodiments of the present application;

[0028] Fig. 3 is a schematic diagram of a partial cross-sectional structure of a planet carrier according to one or more embodiments of the present application;

[0029] Fig. 4 is a schematic diagram of a structure of a stepped planetary gear according to one or more embodiments of the present application;

[0030] Fig. 5 is a perspective schematic diagram of an axle according to one or more embodiments of the present application;

[0031] Fig. 6 is a schematic diagram of an oil path of a stepped planetary gear lubrication system under a perspective view according to one or more embodiments of the present application;

[0032] Fig. 7 is a schematic diagram of a side view structure of a stepped planetary gear lubrication system according to one or more embodiments of the present application;

[0033] Fig. 8 is a schematic diagram of a perspective structure of a stepped planetary gear lubrication system according to one or more embodiments of the present application;

[0034] The components represented by the reference numerals in the drawings are as follows:

[0035] 1, output shaft; 2, first carrier body; 31, first support bearing; 32, second support bearing; 4, first oil receiving ring; 5, second carrier body; 51, spraying part; 6, outer gear ring; 7, housing; 8, end cover; 91, small end gear ring; 92, large end gear ring; 10, second oil receiving ring; 101, oil receiving part; 102, oil guiding part; 11, input shaft; 12, axle; 13, first axial oil passage; 14, first radial oil passage; 15, oil passage pipe; 16, second axial oil passage; 17, second radial oil passage; 18, third axial oil passage; 19, third radial oil passage; 20, fourth axial oil passage; 21, fourth radial oil passage; 22, needle bearing; 23, sun gear. DETAILED DESCRIPTION

[0036] In order to make the objectives, features and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present patent. EMBODIMENT

[0037] In an exemplary embodiment of the present application, as shown in FIGS. 1-8, a stepped planetary row lubricating system is provided, comprising an output shaft 1, an input shaft 11, a planetary gear set, a planet carrier and a housing 7, the housing 7 is detachably provided with an end cover 8, the output shaft 1 and the input shaft 11 are coaxially arranged, and the output shaft 1 and the input shaft 11 both penetrate the housing 7, the planetary gear set comprises a sun gear 23, a planet gear and an outer ring gear 6, the sun gear 23 is fixedly arranged at one end of the input shaft 11, the sun gear 23 is coaxially arranged with the input shaft 11, the planet gear is rotatably arranged on the side wall inside the planet carrier, the planet gear is engaged with the sun gear 23, the planet carrier is rotatably arranged inside the housing 7, the outer ring gear 6 is fixedly arranged on the inner wall of the housing 7, the planet gear is also engaged with the outer ring gear 6, the planet gear can not only rotate around the shaft on the planet carrier, but also drive the planet carrier to rotate around the shaft during revolution, and the planet carrier is fixedly connected with one end of the output shaft 1, so as to drive the output shaft 1 to rotate around the shaft through the planet carrier.

[0038] The input shaft 11 and the output shaft 1 are rotatably connected with the housing 7, and fixed bearings are arranged between the input shaft 11, the output shaft 1 and the housing 7, planet carrier support bearings are arranged between the two ends of the planet carrier and the housing 7, as shown in FIG. 1, a first support bearing 31 is arranged between one end of the planet carrier and the housing 7, and a second support bearing 32 is arranged between the other end of the planet carrier and the housing 7, so as to ensure the support of the planet carrier and the smoothness of rotation around the shaft, and avoid the rotation wear between the planet carrier and the housing 7.

[0039] The planet gear is fixedly arranged on the inner wall of the planet carrier through an axle 12, the axle 12 is fixedly connected with the planet carrier, the planet gear is rotatably arranged on the axle 12, and the planet gear and the axle 12 are rotatably connected through a needle bearing 22, in the present embodiment, the planet gear is a stepped planet gear, as shown in FIG. 4, the stepped planet gear comprises a small end ring 91 and a large end ring 92 which are fixedly connected, the small end ring 91 and the large end ring 92 are coaxially arranged, the outer diameter of the small end ring 91 is smaller than that of the large end ring 92, the large end ring 92 is used for engaging with the sun gear, and the small end ring 91 is used for engaging with the outer ring gear 6.

[0040] The planet carrier is a hollow cylindrical structure, both ends of the planet carrier are circular plate structures containing through holes, the side wall of the planet carrier is composed of a plurality of spray parts 51 arranged at intervals in the circumferential direction, and there is a space allowing the planet wheel to be exposed between adjacent spray parts 51, as shown in FIG. 3, the planet carrier includes a first carrier body 2 and a second carrier body 5, the first carrier body 2 and the second carrier body 5 are butted and fixed, the first carrier body 2 is mainly a circular plate structure, a support part is fixedly arranged at the middle position of the first carrier body 2, the support part contains a through hole, and a gear groove for cooperating with the output shaft 1 is arranged on the inner wall of the through hole, a gear ring is arranged at the end of the output shaft 1 connected with the first carrier body 2, the first carrier body 2 and the output shaft 1 are quickly connected through the plug-in cooperation of the gear groove and the gear ring, so that the output shaft 1 can be driven by the first carrier body 2 to rotate synchronously around the shaft; the main body of the second carrier body 5 is also a circular plate structure, a through hole allowing the input shaft 11 to pass through is arranged at the middle position of the second carrier body 5, a plurality of spray parts 51 are fixedly arranged at intervals in the circumferential direction of the inner wall of the second carrier body 5 close to the edge, and the spray parts 51 are arc-shaped structures.

[0041] As shown in FIG. 1, a first axial oil channel 13 is arranged in the interior of the output shaft 1 along the axial direction thereof, the first axial oil channel 13 penetrates the output shaft 1, a first radial oil channel 14 is arranged on the side wall of the output shaft 1, the first radial oil channel 14 is in communication with the first axial oil channel 13, the first radial oil channel 14 is located between the first support bearing 31 and the fixed bearing of the output shaft 1, lubricating oil can be transported through the first axial oil channel 13 and delivered to the first support bearing 31 and the fixed bearing of the output shaft 1 through the first radial oil channel 14, so as to lubricate the first support bearing 31 and the fixed bearing of the output shaft 1.

[0042] A third axial oil channel 18 is arranged in the interior of the input shaft 11 along the axial direction thereof, the third axial oil channel 18 penetrates the end of the input shaft 11 close to the output shaft 1, the third axial oil channel 18 is in communication with the first axial oil channel 13 through the oil channel pipe 15, so that the lubricating oil in the first axial oil channel 13 is transported into the third axial oil channel 18, a third radial oil channel 19 is arranged on the side wall of the input shaft 11, the third radial oil channel 19 is in communication with the third axial oil channel 18, the third radial oil channel 19 is located between the second support bearing 32 and the fixed bearing of the input shaft 11, lubricating oil can be transported through the third axial oil channel 18 and delivered to the second support bearing 32 and the fixed bearing of the input shaft 11 through the third radial oil channel 19, so as to lubricate the second support bearing 32 and the fixed bearing of the input shaft 11.

[0043] The first radial oil passage 14 and the third radial oil passage 19 are arranged in a ring direction of the corresponding shaft, and the sum of the cross-sectional areas of the first radial oil passage 14 is not less than the sum of the cross-sectional areas of the third radial oil passage 19, so as to realize the purpose of delivering lubricating oil to the periphery.

[0044] The one end of the oil passage pipe 15 is in interference fit with the first axial oil passage 13, and the other end of the oil passage pipe 15 is in clearance fit with the third axial oil passage 18, so as to ensure that the lubricating oil flows between the input shaft 11 and the output shaft 1 without leakage, and to avoid that the input shaft 11 directly drives the output shaft 1 to rotate around the shaft. Since the output shaft 1 rotates at a low speed, the fixed connection of the oil passage pipe 15 and the output shaft 1 can ensure that the oil passage pipe 15 rotates at a low speed, so that the connection is more stable.

[0045] As shown in FIG. 1 and FIG. 3, the second axial oil passage 16 is arranged in the inside of the spraying part 51, and a plurality of second radial oil passages 17 are arranged in the inside of the spraying part 51 (i.e. the side close to the sun gear 23). The second axial oil passage 16 penetrates the end of the spraying part 51 close to the first frame 2, and a through hole is arranged at the corresponding position of the first frame 2. It can be understood that the second axial oil passage 16 penetrates the end of the planet carrier close to the output shaft 1, and the second radial oil passages 17 are arranged in the axial direction of the spraying part 51. The diameter of the second radial oil passage 17 close to the input shaft 11 is greater than the diameter of the second radial oil passage 17 close to the output shaft 1, so as to ensure that there is sufficient lubricating oil for spraying the sun gear 23 and the large end ring 92 of the planet gear. Specifically, in the present embodiment, the second radial oil passages 17 on the spraying part 51 are provided with three groups, two of which are used for spraying the small end ring 91 of the stepped planet gear and the outer ring gear 6, and the other group is used for spraying the large end ring 92 of the stepped planet gear and the sun gear 23. The hole diameter for spraying the small end ring 91 of the stepped planet gear and the outer ring gear 6 is smaller than the hole diameter for spraying the large end ring 92 of the stepped planet gear and the sun gear 23.

[0046] The planet carrier is respectively inserted with one oil receiving ring, as shown in FIG. 1, the first frame 2 is inserted with a first oil receiving ring 4, and the second frame 5 is inserted with a second oil receiving ring 10. The first oil receiving ring 4 and the second oil receiving ring 10 are used for receiving the lubricating oil of the first support bearing 31 and the second support bearing 32 respectively, and guiding and delivering the lubricating oil.

[0047] The first oil receiving ring 4 and the second oil receiving ring 10 are the same in structure, as shown in FIG. 2, the oil receiving ring comprises an oil receiving part 101 and an oil guiding part 102, the axis of the oil guiding part 102 is parallel to the axis of the oil receiving part 101, the oil receiving part 101 is an annular structure with an inner opening, the diameter of the middle opening on the side wall of the oil receiving part 101 close to the planet carrier is smaller than the diameter of the middle opening on the side wall of the oil receiving part 101 away from the planet carrier, the inside of the oil receiving part 101 is hollow; the oil guiding part 102 is provided with a plurality of oil guiding parts 102, the plurality of oil guiding parts 102 are fixedly arranged on the outer circle of the oil receiving part 101 in the ring direction, the oil guiding part 102 is a hollow tubular structure, one end of the oil guiding part 102 is open, and the other end is communicated with the inside of the oil receiving part 101.

[0048] In order to improve the oil receiving efficiency, a lip can also be arranged on the oil receiving ring, the lip is fixedly arranged at the middle opening on the side wall of the oil receiving part 101 close to the planet carrier, the lip is arranged in the ring direction, and the lip is arranged obliquely to reduce the contact area between the oil receiving part 101 and the side wall of the planet carrier and improve the connection sealing between the two.

[0049] The oil guiding part 102 on the first oil receiving ring 4 penetrates through the through hole on the first carrier body 2 and is inserted into the second axial oil channel 16 on the second carrier body 5, the first support bearing 31 installed at the first carrier body 2 is located in the space enclosed by the inner circle of the first oil receiving ring 4, so that the lubricating oil of the first support bearing 31 can be received by the oil receiving part 101 on the first oil receiving ring 4, and the lubricating oil can be guided and delivered into the second axial oil channel 16 of the spraying part 51 by the oil guiding part 102 on the first oil receiving ring 4, so that the lubricating oil is sprayed onto the sun gear 23, the planet gears and the outer gear ring 6 by the spraying part 51 during the rotation of the planet carrier, and the uniform coating of the lubricating oil is realized through the meshing between the sun gear 23, the planet gears and the outer gear ring 6.

[0050] As shown in FIG. 5, the fourth axial oil channel 20 is arranged on the inside of the wheel shaft 12 in the axial direction, the fourth radial oil channel 21 is arranged on the side wall of the wheel shaft 12, the fourth radial oil channel 21 is communicated with the fourth axial oil channel 20, and the second oil receiving ring 10 is inserted on the second carrier body 5, specifically, the oil guiding part 102 on the second oil receiving ring 10 penetrates through the second carrier body 5 and is inserted into the fourth axial oil channel 20 of the wheel shaft 12, the second support bearing 32 installed at the second carrier body 5 is located in the space enclosed by the inner circle of the second oil receiving ring 10, so that the lubricating oil of the second support bearing 32 can be received by the oil receiving part 101 on the second oil receiving ring 10, and the lubricating oil can be guided and delivered into the fourth axial oil channel 20 of the wheel shaft 12 by the oil guiding part 102 on the second oil receiving ring 10, and then the lubricating oil can be delivered to the needle roller bearing 22 by the fourth radial oil channel 21 on the wheel shaft 12, so as to lubricate the needle roller bearing 22 and ensure the smoothness of the rotation of the planet gears.

[0051] The setting of the oil receiving ring eliminates the need to open complex oil channels on the housing 7 and the gear inner hub, simplifies the oil channel structure on the planet carrier, reduces the processing difficulty, and ensures the sealing of the housing 7.

[0052] Based on the setting of the first oil receiving ring 4 and the first axial oil channel 13, the first radial oil channel 14, the second axial oil channel 16, and the second radial oil channel 17, the lubrication of the fixed bearing of the output shaft 1, the first support bearing 31, the stepped planet wheel, the sun gear 23, and the outer gear ring 6 is achieved. Based on the setting of the oil pipe 15 between the output shaft 1 and the input shaft 11, the oil channel connection of the input shaft 11 and the output shaft 1 is achieved. Based on the setting of the second oil receiving ring 10, the third axial oil channel 18, the third radial oil channel 19, the fourth axial oil channel 20, and the fourth radial oil channel 21, the lubrication of the fixed bearing of the input shaft 11, the second support bearing 32, and the needle bearing 22 is achieved. Based on a single oil source, the lubrication of all moving parts of the stepped planetary row under the condition of no oil pool (dry oil pool state) is achieved, which helps to greatly reduce the oil stirring loss of the stepped planetary row, improve the driving system efficiency, and simplify the oil channel to avoid excessive oil channel setting. Embodiment

[0053] In another typical embodiment of the application, a lubrication method is proposed, which adopts the lubrication system of the stepped planetary row mentioned in Embodiment 1, and the specific process is as follows:

[0054] During operation, the input shaft 11 drives the sun gear 23 to rotate around the shaft, and the sun gear 23 meshes with the planet wheel, so that the planet wheel rotates around the shaft and revolves along the outer gear ring 6, and the planet carrier rotates around the shaft under the drive of the planet wheel.

[0055] When the moving parts of the planetary row need to be lubricated, the lubricating oil is delivered through the first axial oil channel 13 in the output shaft 1. The lubricating oil in the first axial oil channel 13 is divided into two paths. One path is guided to the spraying part 51 through the first oil receiving ring 4, and the lubricating oil is sprayed outward through the spraying part 51 during the rotation of the planet carrier, so as to spray the lubricating oil onto the sun gear 23, the planet wheel, and the outer gear ring 6, and the lubricating oil is uniformly coated through the meshing between the sun gear 23, the planet wheel, and the outer gear ring 6. The other path is delivered into the input shaft 11 through the oil pipe 15, and then guided into the wheel shaft 12 through the second oil receiving ring 10, and then delivered to the needle bearing 22 through the fourth radial oil channel 21 on the wheel shaft 12, so as to lubricate the needle bearing 22.

[0056] Specifically, the lubricating oil comes from the first axial oil channel 13 of the output shaft 1, and is flung to the first support bearing 31 via the first radial oil channel 14 during the rotation of the output shaft 1, for lubricating the first support bearing 31, and then is received by the first oil receiving ring 4 and delivered into the second axial oil channel 16 of the spraying part 51, and finally is sprayed and flung inwardly by the second radial oil channel 17 toward the inside of the planetary row during the rotation of the planet carrier, for spraying the lubricating oil onto the sun gear 23, the planet gears and the outer gear 6, and achieving uniform coating of the lubricating oil through the meshing between the sun gear 23, the planet gears and the outer gear 6.

[0057] On another oil path, the lubricating oil comes from the first axial oil channel 13 of the output shaft 1, is delivered into the third axial oil channel 18 of the input shaft 11 via the oil passage 15 between the shafts, and then is flung to the second support bearing 32 via the third radial oil channel 19 of the input shaft 11, for lubricating the second support bearing 32, and then is received by the second oil receiving ring 10 and delivered into the fourth axial oil channel 20 of the wheel shaft 12, and finally is sprayed and flung outwardly by the fourth radial oil channel 21, for lubricating the needle bearing 22 supporting the planet gears.

[0058] The above description of disclosed embodiments allows those skilled in the art to make or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stepped planetary row lubrication system comprising a housing (7) and an input shaft (11) which runs through the housing (7), characterized in that Also comprising: a planetary gear set containing a sun gear (23), planet gears and an outer ring gear (6) sequentially engaged, the sun gear (23) being fixedly connected with the input shaft (11), the outer ring gear (6) being fixedly arranged on the housing (7), and the planet gears being rotatably arranged on the wheel shaft (12); a planet carrier rotatably arranged in the housing (7), the wheel shaft (12) being fixedly arranged in the interior of the planet carrier, the side wall of the planet carrier being composed of a plurality of spray parts (51) arranged at intervals in the circumferential direction, the adjacent spray parts (51) having spaces allowing the planet gears to be exposed, the spray part (51) containing a second axial oil passage (16), the interior side of the spray part (51) being provided with a plurality of second radial oil passages (17), and the second axial oil passage (16) being in communication with the second radial oil passage (17); an output shaft (1) having one end penetrating the housing (7) and the other end connected with the planet carrier, the interior of the output shaft (1) being provided with a first axial oil passage (13), the side wall of the output shaft (1) being provided with a plurality of first radial oil passages (14) in the circumferential direction, the first radial oil passage (14) being in communication with the first axial oil passage (13) and being close to the support bearing at one end of the planet carrier; a first oil receiving ring (4) inserted at one end of the planet carrier close to the output shaft (1) and used for receiving the lubricating oil of the support bearing and conducting the lubricating oil into the second axial oil passage (16).

2. A stepped planetary train lubrication system as claimed in claim 1, characterised in that, The input shaft (11) is coaxially arranged with the output shaft (1), the input shaft (11) is provided with a third axial oil passage (18) in the interior, the third axial oil passage (18) is in communication with the first axial oil passage (13) through an oil passage pipe (15), the side wall of the input shaft (11) is provided with a plurality of third radial oil passages (19) in the circumferential direction, the third radial oil passage (19) is in communication with the third axial oil passage (18), and the third radial oil passage (19) is close to the support bearing at the other end of the planet carrier.

3. A stepped planetary train lubrication system as claimed in claim 2, characterised in that, One end of the oil passage pipe (15) is in interference fit with the first axial oil passage (13), and the other end of the oil passage pipe (15) is in clearance fit with the third axial oil passage (18).

4. A stepped planetary train lubrication system as claimed in claim 2, wherein, The sum of the cross-sectional areas of the first radial oil passages (14) is not less than the sum of the cross-sectional areas of the third radial oil passages (19).

5. A stepped planetary train lubrication system as claimed in claim 2, wherein, The first oil receiving ring (4) comprises an annular oil receiving part (101), the support bearing is located within the range enclosed by the inner ring of the oil receiving part (101), the interior of the oil receiving part (101) is hollow, the inner ring of the oil receiving part (101) is open, a plurality of oil guiding parts (102) are fixedly arranged at intervals on the outer ring, the opening diameter of the side wall on one side of the oil receiving part (101) is smaller than the opening diameter of the other side, the oil guiding part (102) is in tubular structure, one end of the oil guiding part (102) is open, and the other end is in communication with the interior of the oil receiving part (101).

6. A stepped planetary train lubrication system as claimed in claim 5, characterised in that, A lip is fixedly arranged at the inner ring of the oil receiving part (101), the lip is arranged in the circumferential direction, and the oil receiving part (101) is in contact with the side wall of the planet carrier through the lip.

7. A stepped planetary train lubrication system as claimed in claim 5, wherein, The second oil receiving ring (10) is inserted at one end close to the input shaft (11), and the second oil receiving ring (10) is identical in structure to the first oil receiving ring (4), and the oil receiving part (101) of the second oil receiving ring (10) is used to receive the lubricating oil thrown by the third radial oil channel (19) to the support bearing, and the oil guiding part (102) of the second oil receiving ring (10) is inserted into the wheel shaft (12) of the planetary gear.

8. A stepped planetary train lubrication system as claimed in claim 7, characterised in that, The wheel shaft (12) is provided with a fourth axial oil channel (20), and the oil guiding part (102) of the second oil receiving ring (10) is inserted into the fourth axial oil channel (20), and the side wall of the wheel shaft (12) is provided with a fourth radial oil channel (21), and the fourth radial oil channel (21) is communicated with the fourth axial oil channel (20).

9. A stepped planetary train lubrication system as claimed in claim 1, wherein, The diameter of the second radial oil channel (17) close to the input shaft (11) is greater than the diameter of the second radial oil channel (17) close to the output shaft (1).

10. A lubricating method characterized by, The stepped planetary gear lubricating system is used, and specifically, the lubricating oil is delivered through the first axial oil channel (13) in the output shaft (1), the lubricating oil in the first axial oil channel (13) is divided into two paths, one path is guided to the spraying part (51) through the first oil receiving ring (4), and the lubricating oil is sprayed onto the sun gear (23), the planetary gear and the outer gear ring (6) through the spraying part (51) in the process of rotation of the planetary carrier; the other path is delivered into the input shaft (11) through the oil delivery pipe (15), and is guided into the wheel shaft (12) through the second oil receiving ring (10), and the lubricating oil is delivered to the bearing between the planetary gear and the wheel shaft (12) through the fourth radial oil channel (21).

Images