Two-stage planetary gear sliding bearing lubricating system

Abstract

Lubricating oil is driven by the pressure of a lubricating oil pump to reach the position of a two-stage oil flinger through an in-shaft oil way channel, enters an oil flinging way of the two-stage oil flinger under the driving of the centrifugal force of the two-stage oil flinger rotating at a high speed, and is sprayed out through oil flinging holes in the oil flinger, and the lubricating oil is sprayed out through the oil flinging holes in the oil flinger. And the oil enters an oil receiving channel between the two-stage planetary gear and the sliding bearing, so that efficient and stable lubrication of the sliding bearing of the two-stage planetary gear reducer of the turboprop engine under high speed and heavy load is completed. According to the invention, the oil flinger lubricating mechanism is embedded into the in-shaft oil path system of the two-stage planetary gear, so that fixed-point lubrication of the sliding bearing is realized; the centrifugal acting driving force of the rotor structure on the lubricating oil is increased along with increasing of the rotating speed, the problem that the lubricating system affects the performance of the lubricating oil pump due to the fact that the requirements of a traditional lubricating system for lubricating and cooling are increased under the high-speed and heavy-load state of the turboprop engine is solved, and the lubricating efficiency and stability of the lubricating system are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of turbine power technology, in particular to a two-stage planetary gear sliding bearing lubrication system. BACKGROUND

[0002] The output speed of a turboprop engine needs to be reduced by a reducer to adapt to the propeller of the aircraft. The reducer of the turboprop engine of the aircraft usually adopts a two-stage planetary reducer. When the turboprop engine is under high speed and heavy load, part of the power of the turboprop engine is lost in the reducer and converted into heat energy and a large amount of waste heat is released. If the large amount of waste heat generated in the reducer exceeds the processing capacity of the reducer heat system, the temperature of the components and the lubricating oil of the reducer will be greatly increased, thereby reducing the performance and efficiency of the reducer, entering a vicious cycle, reducing the performance of the turboprop engine, and threatening the safety of the turboprop engine and the aircraft. The lubrication system of the two-stage planetary reducer is very important for the efficiency of the reducer. A simple and efficient lubrication system of the two-stage planetary gear sliding bearing can improve the efficiency of the reducer, reduce the loss of power, reduce the waste heat, reduce the pressure of the thermal control system, and thus improve the performance and stability of the reducer and the turboprop engine. Therefore, how to design a simple and efficient lubrication system of the two-stage planetary gear sliding bearing has become an important technical difficulty to be solved for the turboprop engine.

[0003] As a common reducer for high-speed and heavy-load turboprop engines, the planetary gear of the two-stage planetary gear reducer generally uses sliding bearings, which need to be efficiently lubricated to improve the efficiency of the reducer and reduce waste heat. Due to the compact structure of the multi-stage planetary gear reducer, it is difficult to design a lubrication system that is efficient, compact, and easy to maintain.

[0004] The existing lubrication of the sliding bearing of the two-stage planetary gear reducer generally adopts a fixed lubrication system and a rotating direct connection lubrication system, which are two relatively traditional lubrication methods. However, such multi-stage planetary gear lubrication systems have several problems,

[0005] (1) The fixed lubrication system has a fixed lubricating oil outlet position, while the sliding bearings of the planetary gear move circumferentially around the sun gear. Therefore, a large amount of lubricating oil is wasted, increasing the pressure of the oil pump, and the disadvantage is more obvious at high speed and heavy load.

[0006] (2) The rotating direct connection lubrication system does not have the problem of waste because the direct connection lubricates the sliding bearings. However, it still needs to rely on the oil pump for power. At high speed and heavy load, the performance requirements of the oil pump are very high, but the oil circuit is converted from the shaft to the planetary carrier, which is complex in structure and easy to damage.

[0007] (3) Compared with the compact structure of the two-stage planetary gear reducer, the existing two types of lubricating systems are too complex and bulky, which increases the size of the two-stage gear reducer and reduces the compact structure of the two-stage planetary gear reducer. SUMMARY

[0008] The present application aims to provide a two-stage planetary gear sliding bearing lubricating system to solve the problems of complex structure, low lubricating efficiency and lubricating oil waste of the existing two-stage planetary gear sliding bearing lubricating system, so as to improve the efficiency and compact structure of the planetary gear reducer, and further improve the performance of the high-speed heavy-duty turboprop engine.

[0009] The present application solves the above problems by the following technical solutions:

[0010] A two-stage planetary gear sliding bearing lubricating system for a high-speed heavy-duty turboprop engine, characterized in that it comprises: a first-stage sliding bearing, a first-stage oil throwing disc, a first-stage carrier and a second-stage sun gear connected directly to have the same rotational speed and fixed relative position, and a second-stage sliding bearing, a second-stage oil throwing disc, a second-stage carrier and a power output shaft connected directly to have the same rotational speed and fixed relative position; the second-stage sun gear is sleeved outside the power output shaft, and the outer end is engaged with the second-stage planetary gear sleeved outside the second-stage sliding bearing; the first-stage sliding bearing is sleeved with the first-stage planetary gear, and the first-stage planetary gear is engaged with the power input shaft; wherein the power output shaft, the second-stage oil throwing disc, the second-stage sun gear, the first-stage oil throwing disc and the power input shaft have lubricating oil channels inside to jointly form an in-shaft oil circuit.

[0011] The first-stage oil throwing oil circuit in the first-stage oil throwing disc is connected in communication with the in-shaft oil circuit, and the first-stage oil throwing oil circuit is also connected in communication with the first-stage oil injection hole on the first-stage oil throwing disc, so as to centrifugally throw the lubricating oil of the first-stage oil throwing oil circuit out of the first-stage oil injection hole to the first-stage oil receiving channel between the first-stage planetary gear and the first-stage sliding bearing to realize efficient lubrication and temperature control; the second-stage oil throwing oil circuit in the second-stage oil throwing disc is connected in communication with the in-shaft oil circuit, and the second-stage oil throwing oil circuit is connected in communication with the second-stage oil injection hole on the second-stage oil throwing disc, so as to centrifugally throw the lubricating oil of the second-stage oil throwing oil circuit out of the second-stage oil injection hole to the second-stage oil receiving channel between the second-stage planetary gear and the second-stage sliding bearing to realize efficient lubrication and temperature control.

[0012] As a further improvement, the first-stage oil injection hole is vertically arranged on the outer end surface of the first-stage oil throwing disc at an angle of 45° to the axial direction.

[0013] As a further improvement, the second-stage oil injection hole is vertically arranged on the outer end surface of the second-stage oil throwing disc at an angle of 45° to the axial direction.

[0014] As a further improvement thereof, the first-stage oil receiving passage is annularly arranged between the first-stage planetary gear and the first-stage sliding bearing and is opposite to the position of the first-stage oil injection hole; the second-stage oil receiving passage is annularly arranged between the second-stage planetary gear and the second-stage sliding bearing and is opposite to the position of the second-stage oil injection hole.

[0015] As a further improvement thereof, the first-stage oil throwing passage is divided into several passages, each of which is connected to a group of first-stage oil injection holes, and each group of first-stage oil injection holes corresponds to a first-stage sliding bearing; the second-stage oil throwing passage is divided into several passages, each of which is connected to a group of second-stage oil injection holes, and each group of second-stage oil injection holes corresponds to a second-stage oil receiving passage.

[0016] As a further improvement thereof, the passages of the first-stage oil throwing passage and / or the second-stage oil throwing passage are rectangular.

[0017] As a further improvement thereof, the first-stage oil throwing passage is evenly divided into three passages, and the second-stage oil throwing passage is evenly divided into several passages of five passages.

[0018] As a further improvement thereof, the first-stage oil injection hole and the second-stage oil injection hole are each sequentially composed of an oil inlet circular hole, an oil injection channel and an oil outlet circular hole, and the diameter of the oil inlet circular hole is smaller than the diameter of the oil outlet circular hole, and the oil injection channel is tapered to suppress the atomization tendency of the lubricating oil after entering the air.

[0019] As a further improvement thereof, each group of the first-stage oil injection holes and each group of the second-stage oil injection holes are five, and are arranged in a V-shaped arrangement.

[0020] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0021] (1) In the present application, the driving force of the lubricating oil for lubricating the planetary gear sliding bearing is composed of the centrifugal force generated by the lubricating oil pump and the oil throwing disc when the rotor rotates. At high speed, the high flow demand of lubricating oil is met, and the centrifugal driving force is increased synchronously, reducing the high performance demand of the lubricating oil pump and ensuring the stable and continuous lubrication of the planetary gear and sliding bearing of the high-speed heavy-duty reducer of the turboprop engine.

[0022] (2) In the present application, the relative position of the oil injection hole of the oil throwing disc and the corresponding oil receiving passage is fixed, and the axial and radial positions between the oil injection hole and the oil receiving passage, the inclined surface arrangement of the oil injection hole and the certain oil injection angle ensure that most of the lubricating oil in the oil injection hole enters the oil receiving passage at high speed and heavy load, participates in the lubrication and temperature control of the planetary gear and its sliding bearing, improves the lubrication efficiency and reduces the waste of lubricating oil.

[0023] (3) The conical oil injection hole improves the stability of the injected lubricating oil, prevents the lubricating oil from being atomized in the air, restricts the splash area of the lubricating oil, ensures that the lubricating oil enters the oil receiving channel in a liquid state, and plays a lubricating role.

[0024] (4) The oil throwing disc and the oil receiving channel are arranged with five oil injection holes at the corresponding V-shaped position, which meets the large lubricating oil flow demand of the turboprop engine at high speed and heavy load in the limited window interval, and ensures the oil inlet rate of the lubricating oil into the oil receiving channel through the position relationship between the oil injection hole and the oil receiving channel. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a cross section schematic view of the lubricating system of the sliding bearing of the two-stage planetary gear reducer of the application;

[0026] Figure 2 It is a schematic view of the lubricating system of the sliding bearing of the two-stage planetary gear reducer of the application;

[0027] Figure 3 It is a schematic view of the position relationship of the first-stage oil throwing and oil receiving structure of the application;

[0028] Figure 4 It is a schematic view of the position relationship of the second-stage oil throwing and oil receiving structure of the application;

[0029] Figure 5 It is a schematic view of the oil throwing oil way and the oil injection hole of the first-stage oil throwing disc of the application;

[0030] Figure 6 It is a schematic view of the oil throwing oil way and the oil injection hole of the second-stage oil throwing disc of the application.

[0031] The figure mark: 1, power input shaft; 2, first-stage planetary gear; 3, first-stage sliding bearing; 4, first-stage oil throwing disc; 5, first-stage planet carrier; 6, second-stage sun gear; 7, second-stage planetary gear; 8, second-stage sliding bearing; 9, second-stage oil throwing disc; 10, second-stage planet carrier; 11, power output shaft; 12, shaft inner oil way; 13, first-stage oil throwing oil way; 14, first-stage oil injection hole; 15, first-stage oil receiving channel; 16, second-stage oil throwing oil way; 17, second-stage oil injection hole; 18, second-stage oil receiving channel; 19, first-stage oil inlet round hole; 20, first-stage oil injection channel; 21, first-stage oil outlet round hole; 22, second-stage oil inlet round hole; 23, second-stage oil injection channel; 24, second-stage oil outlet round hole. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0033] Embodiment:

[0034] Referring to the drawings Figures 1-6 A two-stage planetary gear sliding bearing lubrication system for high-speed heavy-load turboprop engine, comprising a power input shaft 1, a first-stage planetary gear 2, a first-stage sliding bearing 3, a first-stage oil throwing disc 4, a first-stage planet carrier 5, a second-stage sun gear 6, a second-stage planetary gear 7, a second-stage sliding bearing 8, a second-stage oil throwing disc 9, a second-stage planet carrier 10, a power output shaft 11, an in-shaft oil passage 12, a first-stage oil throwing oil passage 13, a first-stage oil injection hole 14, a first-stage oil receiving passage 15, a second-stage oil throwing oil passage 16, a second-stage oil injection hole 17, a second-stage oil receiving passage 18, etc. Among them, the first-stage sliding bearing 3, the first-stage oil throwing disc 4, the first-stage planet carrier 5 and the second-stage sun gear 6 are directly connected and have the same rotational speed and fixed relative position. The second-stage sliding bearing 8, the second-stage oil throwing disc 9, the second-stage planet carrier 10 and the power output shaft 11 are directly connected and have the same rotational speed and fixed relative position.

[0035] The second-stage sun gear 6 is sleeved on the power output shaft 11, and the outer end is engaged with the second-stage planetary gear 7 sleeved on the second-stage sliding bearing 8. The first-stage sliding bearing 3 is sleeved with the first-stage planetary gear 2, and the first-stage planetary gear 2 is engaged with the power input shaft 1. There are lubricating oil passages in the power output shaft 11, the second-stage oil throwing disc 9, the second-stage sun gear 6, the first-stage oil throwing disc 4 and the power input shaft 1 to jointly form the in-shaft oil passage 12.

[0036] The first-stage oil-throwing oil passage 13 located in the first-stage oil-throwing disc 4 is in communication with the shaft inner oil passage 12, and the first-stage oil-throwing oil passage 13 is also in communication with the first-stage oil injection hole 14 on the first-stage oil-throwing disc 4, so as to throw the lubricating oil in the first-stage oil-throwing oil passage 13 out to the first-stage oil-receiving passage 15 through the first-stage oil injection hole 14; the second-stage oil-throwing oil passage 16 located in the second-stage oil-throwing disc 9 is in communication with the shaft inner oil passage 12, and the second-stage oil-throwing oil passage 16 is in communication with the second-stage oil injection hole 17 on the second-stage oil-throwing disc 9, so as to throw the lubricating oil in the second-stage oil-throwing oil passage 16 out to the second-stage oil-receiving passage 18 through the second-stage oil injection hole 17; as a preferred, the first-stage oil injection hole 14 is vertically arranged on the outer end surface of the first-stage oil-throwing disc 4 at an angle of 45° with the shaft axis. The second-stage oil injection hole 17 is vertically arranged on the outer end surface of the second-stage oil-throwing disc 9 at an angle of 45° with the shaft axis. The lubricating oil in the shaft inner oil passage 12 enters the first-stage oil-throwing oil passage 13 due to the centrifugal force at a certain rotating speed, is sprayed out through the first-stage oil injection hole 14 vertically arranged on the outer end surface of the first-stage oil-throwing disc 4 at an angle of 45° with the shaft axis, and has axial and radial velocities, and accurately reaches the first-stage oil-receiving passage 15. The lubricating oil in the shaft inner oil passage 12 enters the second-stage oil-throwing oil passage 16 due to the centrifugal force at a certain rotating speed, is sprayed out through the second-stage oil injection hole 17 vertically arranged on the outer end surface of the second-stage oil-throwing disc 9 at an angle of 45° with the shaft axis, and has axial and radial velocities, and accurately reaches the second-stage oil-receiving passage 18.

[0037] The lubricating oil in the lubricating system flows in the shaft inner oil passage 12 composed of the power output shaft 11, the second-stage oil-throwing disc 9, the second-stage sun gear 6, the first-stage oil-throwing disc 4, the power input shaft 1 through flexible connection under the pressure from the power output shaft 11 to the power input shaft 1 direction. The lubricating oil in the shaft inner oil passage 12 flows in the shaft under the centrifugal force at a certain rotating speed, flows radially along the first-stage oil-throwing oil passage 13 in the first-stage oil-throwing disc 4, and is sprayed out through the circular first-stage oil injection hole 14, flows radially along the second-stage oil-throwing oil passage 16 in the second-stage oil-throwing disc 9, and is sprayed out through the circular second-stage oil injection hole 17.

[0038] The first-stage oil-receiving passage 15 is annular between the first-stage planetary gear 2 and the first-stage sliding bearing 3, and is opposite to the position of the first-stage oil injection hole 14. The second-stage oil-receiving passage 18 is annular between the second-stage planetary gear 7 and the second-stage sliding bearing 8, and is opposite to the position of the second-stage oil injection hole 17.

[0039] The lubricating oil in the lubricating system is sprayed out through the first-stage oil injection hole 14, enters the annular first-stage oil-receiving passage 15 between the first-stage planetary gear 2 and the first-stage sliding bearing 3, is sprayed out through the second-stage oil injection hole 17, enters the annular second-stage oil-receiving passage 18 between the second-stage planetary gear 7 and the second-stage sliding bearing 8, and completes the efficient lubrication and temperature control of the first-stage sliding bearing 3 and the second-stage sliding bearing 8.

[0040] The first stage sliding bearing 3 and the first stage oil throwing disc 4 have the same rotational speed relative to the axis, and the relative positions of the first stage oil injection hole 14 and the first stage oil receiving passage 15 are fixed; the second stage sliding bearing 8 and the second stage oil throwing disc 9 have the same rotational speed relative to the axis, and the relative positions of the second stage oil injection hole 17 and the second stage oil receiving passage 18 are fixed; so as to prevent the loss of lubricating oil and the decrease of lubricating efficiency caused by the failure of the lubricating oil to enter the first stage oil receiving passage 15 and the second stage oil receiving passage 18 in different relative positions.

[0041] In an alternative embodiment, referring to the attached drawings Figures 5-6 The first stage oil throwing passage 13 is divided into three passages, each of which is rectangular and connected to three groups of first stage oil injection holes 14 respectively, so as to ensure the lubrication of the corresponding three first stage sliding bearings 3. The first stage oil injection hole 14 is composed of a first stage oil inlet circular hole 19, a first stage oil injection channel 20 and a first stage oil outlet circular hole 21 arranged in sequence, the diameter of the first stage oil inlet circular hole 19 is smaller than that of the first stage oil outlet circular hole 21, and the first stage oil injection channel 20 is tapered; so as to suppress the atomization tendency of the lubricating oil after leaving the first stage oil throwing disc 4 and entering the air, and ensure that most of the lubricating oil enters the first stage oil receiving passage 15 in an effective liquid state. The second stage oil throwing passage 16 is divided into five passages, each of which is rectangular and connected to five groups of second stage oil injection holes 17. The second stage oil injection hole 17 is composed of a second stage oil inlet circular hole 22, a second stage oil injection channel 23 and a second stage oil outlet circular hole 24 arranged in sequence, the diameter of the second stage oil inlet circular hole 22 is smaller than that of the second stage oil outlet circular hole 24, and the second stage oil injection channel 23 is tapered; so as to suppress the atomization tendency of the lubricating oil after leaving the second stage oil throwing disc 9 and entering the air, and ensure that most of the lubricating oil enters the second stage oil receiving passage 18 in an effective liquid state.

[0042] As a preferred embodiment, each group of five first stage oil injection holes 14 is arranged in a V-shaped manner, so as to ensure that most of the lubricating oil can enter the first stage oil receiving passage 15 and improve the utilization rate and lubricating efficiency of the lubricating oil. Each group of five second stage oil injection holes 17 is also arranged in a V-shaped manner, so as to ensure that most of the lubricating oil can enter the second stage oil receiving passage 18 and improve the utilization rate and lubricating efficiency of the lubricating oil. The first stage oil receiving passage 15 corresponds to the five first stage oil injection holes 14 arranged in a V-shaped manner on the first stage oil throwing disc 4. The number of the second stage planetary gears 7 and the second stage sliding bearings 8 is five respectively, and the second stage oil receiving passage 18 corresponds to the five second stage oil injection holes 17 arranged in a V-shaped manner on the second stage oil throwing disc 9.

[0043] Working principle: lubricating oil flows from the power output shaft to the power input shaft in the shaft oil circuit composed of the power output shaft, the second stage oil throwing disc, the second stage sun gear, the first stage oil throwing disc and the power input shaft, and at a certain speed, the lubricating oil in the shaft oil circuit flows in the shaft and is subjected to centrifugal force, flows along the first stage oil throwing oil path in the first stage oil throwing disc, and is sprayed out through the circular first stage oil injection hole, and flows along the second stage oil throwing oil path in the second stage oil throwing disc, and is sprayed out through the circular second stage oil injection hole. The lubricating oil sprayed out through the first stage oil injection hole enters the annular first stage oil receiving channel between the first stage planetary gear and the first stage sliding bearing, and the lubricating oil sprayed out through the second stage oil injection hole enters the annular second stage oil receiving channel between the second stage planetary gear and the second stage sliding bearing, thereby achieving efficient lubrication and temperature control of the first stage sliding bearing and the second stage sliding bearing.

[0044] The present application achieves fixed-point directional lubrication of the sliding bearing by arranging two oil throwing disc type lubrication systems in the shaft oil circuit system of the two-stage planetary gear, replacing the traditional fixed and rotating direct connection type sliding bearing lubrication system, which solves the problem of waste of lubricating oil in the fixed lubrication system and the problem of complex structure and easy damage of the rotating oil circuit in the rotating direct connection type lubrication system. The lubricating oil of the lubrication system enters the oil circuit and oil injection hole of the two-stage oil throwing disc through the shaft oil circuit channel, and reaches the oil receiving channel between the two-stage planetary gear and the sliding bearing under the driving of the centrifugal force of the rotating two-stage oil throwing disc, thereby achieving efficient lubrication of the sliding bearing of the two-stage planetary gear reducer of the turboprop engine under high speed and heavy load. By increasing the centrifugal driving force of the rotor on the lubricating oil with the increase of the rotating speed, the problem of increasing lubrication and cooling requirements of the traditional lubrication system under high speed and heavy load of the turboprop engine is solved, the performance requirements of the lubricating oil pump under high speed and heavy load are reduced, and the lubrication efficiency and stability of the lubrication system are improved.

[0045] Although the present application has been described herein with reference to the explanatory embodiments thereof, the above-described embodiments are merely preferred embodiments of the present application, and the embodiments of the present application are not limited to the above-described embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in the present application.

Claims

1. A two-stage planetary gear sliding bearing lubrication system for a high speed heavy duty turboprop engine, characterized in that, The application relates to a lubricating oil circuit for a planetary gear transmission. The first-stage sliding bearing (3), the first-stage oil-throwing disc (4), the first-stage planet carrier (5) and the second-stage sun gear (6) are directly connected to have the same rotating speed and fixed relative position, and the second-stage sliding bearing (8), the second-stage oil-throwing disc (9), the second-stage planet carrier (10) and the power output shaft (11) are directly connected to have the same rotating speed and fixed relative position; The second-stage sun gear (6) is sleeved outside the power output shaft (11), and the outer end is engaged with the second-stage planet gear (7) sleeved outside the second-stage sliding bearing (8); the first-stage sliding bearing (3) is sleeved with the first-stage planet gear (2), and the first-stage planet gear (2) is engaged with the power input shaft (1); the power output shaft (11), the second-stage oil-throwing disc (9), the second-stage sun gear (6), the first-stage oil-throwing disc (4) and the power input shaft (1) have lubricating oil channels inside to jointly form an in-shaft oil circuit (12); The first-stage oil-throwing oil circuit (13) in the first-stage oil-throwing disc (4) is communicated with the in-shaft oil circuit (12), and the first-stage oil-throwing oil circuit (13) is also communicated with the first-stage oil injection hole (14) on the first-stage oil-throwing disc (4) so as to centrifugally throw the lubricating oil of the first-stage oil-throwing oil circuit (13) out of the first-stage oil injection hole (14) to the first-stage oil-receiving channel (15) between the first-stage planet gear (2) and the first-stage sliding bearing (3) to realize high-efficiency lubrication and temperature control; The second-stage oil-throwing oil circuit (16) in the second-stage oil-throwing disc (9) is communicated with the in-shaft oil circuit (12), and the second-stage oil-throwing oil circuit (16) is communicated with the second-stage oil injection hole (17) on the second-stage oil-throwing disc (9) so as to centrifugally throw the lubricating oil of the second-stage oil-throwing oil circuit (16) out of the second-stage oil injection hole (17) to the second-stage oil-receiving channel (18) between the second-stage planet gear (7) and the second-stage sliding bearing (8) to realize high-efficiency lubrication and temperature control.

2. A two-stage planetary gear sliding bearing lubrication system according to claim 1, characterized in that The first-stage oil injection hole (14) is vertically arranged on the outer end surface of the first-stage oil-throwing disc (4) and forms a 45-degree angle with the axial direction.

3. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 1, characterized in that The second-stage oil injection hole (17) is vertically arranged on the outer end surface of the second-stage oil-throwing disc (9) and forms a 45-degree angle with the axial direction.

4. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 1, characterized in that The first-stage oil-receiving channel (15) is annularly arranged between the first-stage planet gear (2) and the first-stage sliding bearing (3) and is opposite to the position of the first-stage oil injection hole (14). The second-stage oil-receiving channel (18) is annularly arranged between the second-stage planet gear (7) and the second-stage sliding bearing (8) and is opposite to the position of the second-stage oil injection hole (17).

5. A two-stage planetary gear sliding bearing lubrication system according to any one of claims 1-4, characterized in that, The first-stage oil-throwing oil circuit (13) is divided into a plurality of channels, each of which is connected to a group of first-stage oil injection holes (14), and each group of first-stage oil injection holes (14) corresponds to a first-stage sliding bearing (3). The second-stage oil-throwing oil circuit (16) is divided into a plurality of channels, each of which is connected to a group of second-stage oil injection holes (17), and each group of second-stage oil injection holes (17) corresponds to a second-stage oil-receiving channel (18).

6. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 5, characterized in that The channels of the first-stage oil-throwing oil circuit (13) and / or the second-stage oil-throwing oil circuit (16) are rectangular.

7. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 5, characterized in that The first-stage oil-throwing oil passage (13) is evenly divided into three channels, and the second-stage oil-throwing oil passage (16) is evenly divided into several five channels.

8. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 5, characterized in that The first-stage oil injection hole (14) and the second-stage oil injection hole (17) are each composed of an oil inlet round hole, an oil injection channel and an oil outlet round hole in sequence, and the diameter of the oil inlet round hole is smaller than that of the oil outlet round hole, and the oil injection channel is tapered to inhibit the atomization tendency of the lubricating oil after entering the air.

9. A two-stage planetary gear sliding bearing lubrication system as claimed in claim 5, wherein, Each group of the first-stage oil injection hole (14) and each group of the second-stage oil injection hole (17) are five, and are arranged in V-shaped arrangement.

Images