Planetary gear bearing lubrication structure

Abstract

The application provides a kind of planetary gear bearing lubrication structure, belongs to bearing equipment manufacturing field;The application includes: floating ring sliding bearing, thrust sliding bearing, pin shaft, gear and planet carrier;The pin shaft is installed on the planet carrier, and the gear is sleeved on the pin shaft;The floating ring sliding bearing is installed between the pin shaft and the gear, and the floating ring sliding bearing has a sliding gap between the radial surface of the pin shaft;Two ends of the floating ring sliding bearing are respectively provided with one thrust sliding bearing;Each thrust sliding bearing is fixed on the planet carrier, and has a sliding surface matched with the axial end surface of the corresponding gear;The planet carrier is provided with an oil guide hole, the pin shaft is provided with an oil guide channel, and the oil guide hole is communicated with the sliding gap through the oil guide channel.The application is installed by the cooperation of floating ring sliding bearing and thrust sliding bearing, so as to ensure the stability of floating ring bearing working gap, cooperate with the oil guide channel in the planet carrier, can form stable oil film in the floating ring bearing, greatly improve the lubrication performance.

Description

TECHNICAL FIELD

[0001] The application relates to a bearing manufacturing technology, in particular to a planetary gear bearing lubricating structure. BACKGROUND

[0002] The wind power gear box is one of the main key components of a wind turbine generator unit, and the bearing is an important core part. Rolling bearings have the advantages of size standardization, convenient selection, stable quality, good interchangeability, low starting torque, etc., and are widely used in wind power gear boxes. However, with the development of wind turbine generators to high-power models, limited by the size, load capacity, reliability and cost of rolling bearings, sliding bearings are used to replace rolling bearings and are applied to wind power main bearings and planetary gears and parallel shafts of the gear box, which has become a new development trend. According to industry forecasts, compared with wind power gear boxes using rolling bearings, wind power gear boxes using sliding bearings can increase the torque density by 25%, reduce the transmission chain length by 5%, reduce the weight of the gear box by 5%, and reduce the cost by 15%. Therefore, the application of sliding bearings will be one of the most potential design schemes for future wind power gear boxes.

[0003] In the prior art, in order to reduce the size of the speed reducer as much as possible, a floating ring bearing is generally installed on the pin shaft of the planetary gear. However, it cannot avoid the damage of the floating ring bearing caused by boundary lubrication during start and stop. Moreover, due to the installation, the floating ring needs to be first installed in the planetary gear hole and fixed, and then vertically installed into the planet carrier. Since the floating ring bearing has a certain radial gap during operation, it is also easy to cause local wear of the floating ring bearing to be more serious.

[0004] In addition, in the prior art, due to the different materials and different expansion coefficients of the floating ring bearing and the planetary gear, the expansion amount and interference amount at different working temperatures will affect the sliding bearing gap, thereby affecting the working performance of the bearing, and further reducing the reliability of the bearing. SUMMARY

[0005] The application provides a new planetary gear bearing lubricating structure, which installs a thrust bearing at both ends of the floating ring sliding bearing, so as to ensure the stability of the working gap of the floating ring bearing, thereby solving the technical problems of the prior art that the local wear of the floating ring bearing is more serious and the reliability is low.

[0006] The planetary gear bearing lubricating structure of the embodiment of the application comprises a floating ring sliding bearing, a thrust sliding bearing, a pin shaft, a gear and a planet carrier, the pin shaft is installed on the planet carrier, and the gear is sleeved on the pin shaft.

[0007] The floating ring sliding bearing is installed between the pin shaft and the gear, and has a sliding gap between the radial surface of the pin shaft and the floating ring sliding bearing; two ends of the floating ring sliding bearing are respectively provided with one of the thrust sliding bearings; each of the thrust sliding bearings is fixed on the planet carrier and has a sliding surface matched with the axial end surface of the corresponding gear;

[0008] The planet carrier is provided with an oil guide hole, and the pin shaft is provided with an oil guide channel; the oil guide hole is connected with the sliding gap through the oil guide channel.

[0009] The oil guide channel comprises at least one axial channel and at least two radial channels; the radial channels are perpendicular to the axial channels, and each of the axial channels is provided with one of the radial channels at two ends thereof;

[0010] The radial surface of the pin shaft is provided with an annular oil guide ring; the axial channel is connected with the oil guide ring through the radial channel.

[0011] The inner diameter of the floating ring sliding bearing is provided with an inner ring groove corresponding to the oil guide ring.

[0012] The outer diameter of the floating ring sliding bearing is provided with an outer ring groove corresponding to the inner ring groove; the floating ring sliding bearing is further provided with a communication hole for connecting the inner ring groove and the outer ring groove.

[0013] The inner diameter and the outer diameter of the floating ring sliding bearing are both provided with an oil storage groove; the oil storage groove is connected with the inner ring groove or the outer ring groove.

[0014] The gear has an inner hole sleeving the floating ring sliding bearing; the radial surface of the inner hole is provided with an annular mounting groove.

[0015] The communication hole is a threaded hole provided with a screw; the screw abuts against the bottom of the annular mounting groove through the communication hole, so that the floating ring sliding bearing is sleeved in the inner hole.

[0016] The inner and outer radial surfaces of the floating ring sliding bearing are both provided with a wear-resistant coating, which is a polyether ether ketone coating.

[0017] The floating ring sliding bearing is a ring structure made of copper-tin alloy.

[0018] The planetary gear bearing lubrication structure as described above, wherein the oil storage groove is X-shaped or circular arc-shaped.

[0019] The present application ensures the stability of the working clearance of the floating ring bearing by the cooperation of the floating ring bearing and the thrust sliding bearing, and forms a stable oil film in the floating ring bearing by cooperating with the oil guide channel in the planet carrier, thereby greatly improving the sliding performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a side sectional view of the planetary gear bearing lubrication structure according to an embodiment of the present application.

[0021] Figure 2 FIG. 2 is an inner sectional view of the floating ring sliding bearing in the planetary gear bearing lubrication structure according to an embodiment of the present application.

[0022] Figure 3 FIG. 3 is an outer sectional view of the floating ring sliding bearing in the planetary gear bearing lubrication structure according to an embodiment of the present application.

[0023] Figure 4 FIG. 4 is a sectional view of the gear in the planetary gear bearing lubrication structure according to an embodiment of the present application.

[0024] Figure 5 FIG. 5 is a sectional view of the gear and the floating ring sliding bearing in the planetary gear bearing lubrication structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] The planetary gear bearing lubrication structure described in the present application can be made of the following materials and components, and is not limited to the following materials and components, such as gears, planet carriers, floating ring bearings, thrust sliding bearings, pin shafts, etc.

[0026] As shown in FIG. 1, which is a side sectional view of the planetary gear bearing lubrication structure according to an embodiment of the present application. Figure 1 The planetary gear bearing lubrication structure according to the embodiment includes a floating ring sliding bearing 2, a thrust sliding bearing 3, a pin shaft 1, a gear 10, and a planet carrier 11. The pin shaft 1 is installed on the planet carrier 11, and the gear 10 is sleeved on the pin shaft 1. The pin shaft 1 moves with the planet carrier 11 and provides a rotating shaft for the gear 19 relative to the planet carrier 11.

[0027] The floating ring sliding bearing 2 is installed between the pin shaft 1 and the gear 10, and has a sliding gap between the radial surface of the pin shaft 1 and the floating ring sliding bearing 2; two ends of the floating ring sliding bearing 2 are respectively provided with one of the thrust sliding bearings 3; each of the thrust sliding bearings 3 is fixed on the planet carrier 11 and has a sliding surface matched with the axial end surface of the corresponding gear 10; the sliding surface is used for ensuring that the gear 10 and the end surface of the floating ring sliding bearing 2 can slide relative to the thrust sliding bearing 3.

[0028] In actual use, the floating ring sliding bearing 2 mainly bears the radial load, the thrust sliding bearing 3 mainly bears the axial load, and the axial movement of the floating ring sliding bearing 2 is limited, so that the stability of the working state of the floating ring sliding bearing 2 is ensured.

[0029] The planet carrier 11 is provided with an oil guide hole 4, and the pin shaft 1 is provided with an oil guide channel; the oil guide hole 4 is connected with the sliding gap through the oil guide channel.

[0030] During operation, the lubricating oil enters the oil guide channel through the oil guide hole 4, and then enters the sliding gap between the bearing 2 and the pin shaft 1, so that a dynamic pressure oil film is formed in the sliding gap, which can separate the two contact surfaces and effectively reduce the wear. The lubricating oil can also enter between the thrust sliding bearing 3 and the gear 10, thereby reducing the friction of the axial end surface.

[0031] The floating ring sliding bearing and the thrust sliding bearing are matched and installed, so that the stability of the working gap of the floating ring bearing is ensured, the oil film in the floating ring bearing is formed through the oil guide channel in the planet carrier, and the lubricating performance is greatly improved.

[0032] The planet gear bearing lubricating structure of the embodiment has simple structure and convenient installation, can effectively reduce wear, prolong the service life of the bearing, and reduce the cost.

[0033] The planet gear bearing lubricating structure of the embodiment has simple structure and convenient installation, can effectively reduce wear, prolong the service life of the bearing, and reduce the cost.

[0034] The planet gear bearing lubricating structure of the embodiment, specifically, the oil guide channel comprises at least one axial channel 5 and at least two radial channels 50; the radial channels 50 are perpendicular to the axial channels 5, and each of the axial channels 5 is provided with one of the radial channels 50 at two ends; generally, the oil guide hole 4 guides the lubricating oil into one of the radial channels 50, and then the lubricating oil enters the axial channel 5 and is guided into the lubricating area through the other radial channel 50.

[0035] As Figure 1The radial surface of the pin shaft 1 is provided with an annular oil guide ring 15, and the axial channel 5 is communicated with the oil guide ring 15 through the radial channel 50. The oil guide ring 15 is used to uniformly distribute the lubricating oil on the radial surface of the pin shaft 1, so as to form an oil film.

[0036] As shown in Figure 2 , further, the inner diameter of the floating ring sliding bearing 2 is provided with an inner ring groove 21 corresponding to the oil guide ring 15, so that the lubricating oil input by the oil guide channel can enter the inner ring groove 21, and the oil film lubrication on the inner radial surface of the entire floating ring sliding bearing 2 is facilitated.

[0037] As shown in Figure 3 , the outer diameter of the floating ring sliding bearing 2 of the planetary gear bearing lubricating structure of the embodiment is provided with an outer ring groove 23 corresponding to the inner ring groove 21; and the floating ring sliding bearing 2 is further provided with a communication hole 20 for communicating the inner ring groove 21 and the outer ring groove 23.

[0038] Through the action of the communication hole 20, the lubricating oil can flow from the inner ring groove 21 into the outer ring groove 23, so as to form oil film lubrication on the outer radial surface of the entire floating ring sliding bearing 2.

[0039] The planetary gear bearing lubricating structure of the embodiment, as shown in Figure 2 and Figure 3 , the inner diameter and the outer diameter of the floating ring sliding bearing 1 are both provided with an oil storage groove 22; the oil storage groove 22 is communicated with the inner ring groove 21 or the outer ring groove 23. That is, on the inner radial surface of the floating ring sliding bearing 1, the oil storage groove 22 is communicated with the inner ring groove 21; on the outer radial surface of the floating ring sliding bearing 1, the oil storage groove 22 is communicated with the outer ring groove 23; the design of the oil storage groove 22 can make the lubricating oil more fully and uniformly fill the inner diameter and the outer diameter of the floating ring sliding bearing 1, thereby greatly reducing the friction.

[0040] Preferably, the oil storage groove 22 is X-shaped or circular arc-shaped, or spiral-shaped. When the oil storage groove 22 is circular arc-shaped, it is arranged in the length direction of the surface of the inner diameter or the outer diameter of the floating ring sliding bearing 1, so as to facilitate the coverage of the oil film. When the oil storage groove 22 is spiral-shaped, it is generally a spiral-shaped groove continuously arranged on the surface of the inner diameter or the outer diameter of the floating ring sliding bearing 1.

[0041] The oil storage groove 22 has the effect of keeping the thickness of the oil film stable and diffusing the lubricating oil, and is generally X-shaped and designed to intersect with the inner ring groove 21 or the outer ring groove 23. Of course, the oil storage groove 22 can be spiral-shaped or circular arc-shaped, and the circular arc-shaped structure is more convenient for processing and is also beneficial to the diffusion of the lubricating oil.

[0042] When the floating ring sliding bearing is working, the oil tank can form a fluid dynamic pressure oil film lubrication in the inner and outer clearances, which can effectively reduce the friction and wear under the condition of low speed and heavy load. Meanwhile, the inner and outer surfaces of the floating ring sliding bearing and the surface of the thrust bearing can be coated with a high polymer coating, which can effectively reduce the wear during the start and stop of the bearing.

[0043] The planetary gear bearing lubrication structure of the embodiment has the floating ring sliding bearing 2, the gear 10, the ring-shaped mounting groove 11, the screw 6 and the communication hole 20. Figure 4 and Figure 5 The gear 10 has an inner hole in which the floating ring sliding bearing is sleeved, and the ring-shaped mounting groove 11 is arranged on the radial surface of the inner hole.

[0044] The communication hole 20 is a threaded hole in which the screw 6 is arranged, and the screw 6 abuts against the bottom of the ring-shaped mounting groove 11 through the communication hole 20, so that the floating ring sliding bearing 2 is sleeved in the inner hole.

[0045] The ring-shaped mounting groove 11 can store oil and impurities and can also be used to assist in the installation of the floating ring sliding bearing 2. When the floating ring sliding bearing 2 is installed, the floating ring sliding bearing 2 is first installed horizontally in the inner hole of the gear, the outer ring groove 23 in the middle of the floating ring sliding bearing 2 is aligned with the ring-shaped mounting groove 11 of the inner hole of the gear, the screw 6 is screwed into the threaded hole (the communication hole 20), and the screw 6 is clamped in the ring-shaped mounting groove 11 of the inner hole of the gear 10, so that the floating ring sliding bearing 2 is fixed in the inner hole of the planetary gear. Then, the floating ring sliding bearing 2 and the gear 10 are hoisted and installed vertically into the planet carrier 11, the floating ring sliding bearing 2 is aligned with the pin shaft 1 of the planet carrier, and then the screw 6 is unscrewed. Finally, the pin shaft 1 is installed.

[0046] The planetary gear bearing lubrication structure of the embodiment has the floating ring sliding bearing 2, the gear 10, the ring-shaped mounting groove 11, the screw 6 and the communication hole 20.

[0047] The polyether ether ketone has more significant advantages compared with other special engineering plastics, such as high temperature resistance (260 degrees), excellent mechanical properties, good self-lubricating property, chemical corrosion resistance, flame resistance, peel resistance, wear resistance, strong mechanical properties, and can be used in high-end machinery, nuclear engineering and aviation technology.

[0048] In general, the floating ring sliding bearing 2 is made of a ring-shaped structure of copper-tin alloy.

[0049] It needs to be particularly pointed out that the prior art floating ring sliding bearing 2 generally adopts a copper-tin alloy coating which is applied on the surface of the floating ring sliding bearing steel back, and this process is not only complex in manufacturing process, but also the copper-tin alloy coating is easy to fall off, thereby affecting the continuous lubrication effect; and the whole of the present application is made of copper-tin alloy, which not only has a simple manufacturing process, but also avoids the peeling risk of the metal coating process; and even if the eccentric wear occurs, the lubrication effect will not be greatly affected, and the floating ring sliding bearing can be kept in good working condition for a long time.

[0050] Compared with the prior art, the present application has the following advantages:

[0051] (1) The inner and outer surfaces of the floating ring sliding bearing are provided with "X" type oil grooves and annular grooves, and the inner and outer gaps of the floating ring sliding bearing are supplied with oil lubrication through the oil guide channels on the pin shaft.

[0052] (2) When the floating ring sliding bearing is working, the inner and outer gaps are fluid dynamic pressure oil film lubrication, which can effectively reduce the friction and wear under low speed and heavy load conditions; at the same time, the inner and outer surfaces of the floating ring sliding bearing and the surface of the thrust bearing are coated with a high polymer coating, which can effectively reduce the wear during the start and stop of the bearing.

[0053] (3) The floating ring sliding bearing mainly bears the radial load on the planetary gear, and the thrust sliding bearing mainly bears the axial load on the planetary gear, and simultaneously limits the axial direction of the floating ring sliding bearing; through reasonable gap design, the floating ring sliding bearing can bear the bending moment load, and the thrust sliding bearing does not bear the bending moment load, thereby improving the service life of the thrust sliding bearing.

[0054] (4) The whole floating ring sliding bearing is made of copper alloy, avoiding the complex metal coating process and coating adhesion problem, which can effectively reduce the cost and improve the reliability.

[0055] (5) The floating ring sliding bearing is in clearance fit with the pin shaft and the gear, which is convenient for installation and can offset the influence of expansion deformation under different environmental temperatures on the sliding bearing gap and working performance.

[0056] In addition, the planetary gear bearing lubrication structure of the present application has low manufacturing cost, exquisite layout, compact structure design, long service life, convenient maintenance and installation, and is suitable for lubrication of various planetary gears of wind power variable speed boxes.

[0057] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. Through the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of some deformation and necessary general technology superposition; of course, some important technical features can also be realized by simplification. Based on such understanding, the technical solutions of the present application are essentially or say the parts that contribute to the prior art are: the overall structure and connection mode, and the structures described in each embodiment of the present application.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lubrication structure for a planetary gear bearing, characterized in that, include: Floating ring sliding bearings, thrust sliding bearings, pins, gears, and planetary carriers; The pin is mounted on the planet carrier, and the gear is sleeved on the pin; The floating ring sliding bearing is installed between the pin and the gear, and there is a sliding clearance between the floating ring sliding bearing and the radial surface of the pin; the floating ring sliding bearing is a ring structure made of copper-tin alloy, and a polyetheretherketone wear-resistant coating is provided on both the inner and outer radial surfaces of the floating ring sliding bearing. A thrust sliding bearing is installed at each end of the floating ring sliding bearing; each thrust sliding bearing is fixed on the planetary carrier and has a sliding surface that mates with the axial end face of the corresponding gear. The thrust sliding bearing is mainly responsible for bearing axial load and restricting the axial movement of the floating ring sliding bearing. The planetary carrier is provided with an oil guide hole, and the pin is provided with an oil guide channel. The oil guide hole is connected to the sliding clearance through the oil guide channel. The oil guide channel includes: at least one axial channel and at least two radial channels; The radial channel is perpendicular to the axial channel, and each end of the axial channel is provided with a radial channel; an annular oil guide ring is provided on the radial surface of the pin, and the axial channel is connected to the oil guide ring through the radial channel. The oil guide ring is used to distribute lubricating oil evenly on the radial surface of the pin. The inner diameter of the floating ring sliding bearing is provided with an inner ring groove, which corresponds to the oil guide ring; The outer diameter of the floating ring sliding bearing is provided with an outer ring groove, which corresponds to the inner ring groove; the floating ring sliding bearing is also provided with a connecting hole, which is used to connect the inner ring groove and the outer ring groove. The floating ring sliding bearing is provided with oil reservoirs on both its inner and outer diameters; the oil reservoirs are connected to the inner ring groove or the outer ring groove; the oil reservoirs are X-shaped, arc-shaped or spiral-shaped, and the oil reservoirs can form a hydrodynamic oil film for lubrication in the inner and outer gaps of the floating ring sliding bearing.

2. The planetary gear bearing lubrication structure according to claim 1, characterized in that, The gear has an inner hole for fitting the floating ring sliding bearing, and an annular mounting groove is provided on the radial surface of the inner hole. The connecting hole is a threaded hole, and a screw is installed inside the threaded hole; the screw abuts against the bottom of the annular mounting groove through the connecting hole, so that the floating ring sliding bearing is sleeved in the inner hole.

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